add Edit and HexEdit commands.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11436 6f19259b-4bc3-4df7-8a09-765794883524
author: jcarsey <jcarsey@6f19259b-4bc3-4df7-8a09-765794883524> 2011-03-25 21:15:07 +0000
committer: jcarsey <jcarsey@6f19259b-4bc3-4df7-8a09-765794883524> 2011-03-25 21:15:07 +0000
commit: 632820d1cf1ce7a18ef354255eaeae6fdbf383b9 (patch)
tree: 4bae0e4268fdf79eb2f3aa8035b413c95cb28f10 /ShellPkg/Library/UefiShellDebug1CommandsLib
parent: 5a0fe66eda4a187724b0eb9d660ab21296178af5 (diff)
download: edk2-platforms-632820d1cf1ce7a18ef354255eaeae6fdbf383b9.tar.xz
28 files changed, 14014 insertions, 0 deletions
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/Edit.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/Edit.c
new file mode 100644
index 0000000000..c4dbf80c96
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/Edit.c
@@ -0,0 +1,158 @@
+/** @file
+  Main file for Edit shell Debug1 function.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "UefiShellDebug1CommandsLib.h"
+#include "TextEditor.h"
+
+/**
+  Function for 'edit' command.
+
+  @param[in] ImageHandle  Handle to the Image (NULL if Internal).
+  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
+**/
+SHELL_STATUS
+EFIAPI
+ShellCommandRunEdit (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS          Status;
+  CHAR16              *Buffer;
+  CHAR16              *ProblemParam;
+  SHELL_STATUS        ShellStatus;
+  LIST_ENTRY          *Package;
+  CONST CHAR16        *Cwd;
+  CHAR16              *Nfs;
+  CHAR16              *Spot;
+//  SHELL_FILE_HANDLE   TempHandle;
+
+  Buffer      = NULL;
+  ShellStatus = SHELL_SUCCESS;
+  Nfs         = NULL;
+
+  //
+  // initialize the shell lib (we must be in non-auto-init...)
+  //
+  Status = ShellInitialize();
+  ASSERT_EFI_ERROR(Status);
+
+  Status = CommandInit();
+  ASSERT_EFI_ERROR(Status);
+
+  //
+  // parse the command line
+  //
+  Status = ShellCommandLineParse (EmptyParamList, &Package, &ProblemParam, TRUE);
+  if (EFI_ERROR(Status)) {
+    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
+      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellDebug1HiiHandle, ProblemParam);
+      FreePool(ProblemParam);
+      ShellStatus = SHELL_INVALID_PARAMETER;
+    } else {
+      ASSERT(FALSE);
+    }
+  } else {
+    if (ShellCommandLineGetCount(Package) > 2) {
+      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellDebug1HiiHandle);
+      ShellStatus = SHELL_INVALID_PARAMETER;
+    } else {
+      Cwd = gEfiShellProtocol->GetCurDir(NULL);
+      if (Cwd == NULL) {
+        Cwd = ShellGetEnvironmentVariable(L"path");
+        if (Cwd != NULL) {
+          Nfs = StrnCatGrow(&Nfs, NULL, Cwd+3, 0);
+          if (Nfs != NULL) {
+            Spot = StrStr(Nfs, L";");
+            if (Spot != NULL) {
+              *Spot = CHAR_NULL;
+            }
+            Spot = StrStr(Nfs, L"\\");
+            if (Spot != NULL) {
+              Spot[1] = CHAR_NULL;
+            }
+            gEfiShellProtocol->SetCurDir(NULL, Nfs);
+            FreePool(Nfs);
+          } 
+        }
+      }
+
+      Status = MainEditorInit ();
+
+      if (EFI_ERROR (Status)) {
+        gST->ConOut->ClearScreen (gST->ConOut);
+        gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_MAIN_INIT_FAILED), gShellDebug1HiiHandle);
+      } else {
+        MainEditorBackup ();
+
+        //
+        // if editor launched with file named
+        //
+        if (ShellCommandLineGetCount(Package) == 2) {
+          FileBufferSetFileName (ShellCommandLineGetRawValue(Package, 1));
+//          if (EFI_ERROR(ShellFileExists(MainEditor.FileBuffer->FileName))) {
+//            Status = ShellOpenFileByName(MainEditor.FileBuffer->FileName, &TempHandle, EFI_FILE_MODE_CREATE|EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE, 0);
+//            if (!EFI_ERROR(Status)) {
+//              ShellCloseFile(&TempHandle);
+//            }
+//          }
+        }
+
+        Status = FileBufferRead (MainEditor.FileBuffer->FileName, FALSE);
+        if (!EFI_ERROR (Status)) {
+          MainEditorRefresh ();
+
+          Status = MainEditorKeyInput ();
+        }
+
+        if (Status != EFI_OUT_OF_RESOURCES) {
+          //
+          // back up the status string
+          //
+          Buffer = CatSPrint (NULL, L"%s", StatusBarGetString());
+        }
+
+        MainEditorCleanup ();
+
+        //
+        // print editor exit code on screen
+        //
+        if (Status == EFI_SUCCESS) {
+        } else if (Status == EFI_OUT_OF_RESOURCES) {
+          ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_GEN_OUT_MEM), gShellDebug1HiiHandle);
+        } else {
+          if (Buffer != NULL) {
+            if (StrCmp (Buffer, L"") != 0) {
+              //
+              // print out the status string
+              //
+              ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_MAIN_BUFFER), gShellDebug1HiiHandle, Buffer);
+            } else {
+              ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_MAIN_UNKNOWN_EDITOR_ERR), gShellDebug1HiiHandle);
+            }
+          } else {
+            ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_MAIN_UNKNOWN_EDITOR_ERR), gShellDebug1HiiHandle);
+          }
+        }
+
+        if (Status != EFI_OUT_OF_RESOURCES) {
+          SHELL_FREE_NON_NULL (Buffer);
+        }
+      }
+    }
+    ShellCommandLineFreeVarList (Package);
+  }
+  return ShellStatus;
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c
new file mode 100644
index 0000000000..5843c7807d
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c
@@ -0,0 +1,3353 @@
+/** @file
+  Implements filebuffer interface functions.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "TextEditor.h"
+#include <Guid/FileSystemInfo.h>
+#include <Library/FileHandleLib.h>
+
+EFI_EDITOR_FILE_BUFFER  FileBuffer;
+EFI_EDITOR_FILE_BUFFER  FileBufferBackupVar;
+
+//
+// for basic initialization of FileBuffer
+//
+EFI_EDITOR_FILE_BUFFER  FileBufferConst = {
+  NULL,
+  FileTypeUnicode,
+  NULL,
+  NULL,
+  0,
+  {
+    0,
+    0
+  },
+  {
+    0,
+    0
+  },
+  {
+    0,
+    0
+  },
+  {
+    0,
+    0
+  },
+  FALSE,
+  TRUE,
+  FALSE,
+  NULL
+};
+
+//
+// the whole edit area needs to be refreshed
+//
+STATIC BOOLEAN          FileBufferNeedRefresh;
+
+//
+// only the current line in edit area needs to be refresh
+//
+BOOLEAN                 FileBufferOnlyLineNeedRefresh;
+
+BOOLEAN                 FileBufferMouseNeedRefresh;
+
+extern BOOLEAN          EditorMouseAction;
+
+/**
+  Initialization function for FileBuffer.
+
+  @param EFI_SUCCESS            The initialization was successful.
+  @param EFI_LOAD_ERROR         A default name could not be created.
+  @param EFI_OUT_OF_RESOURCES   A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferInit (
+  VOID
+  )
+{
+  //
+  // basically initialize the FileBuffer
+  //
+  CopyMem (&FileBuffer         , &FileBufferConst, sizeof (EFI_EDITOR_FILE_BUFFER));
+  CopyMem (&FileBufferBackupVar, &FileBufferConst, sizeof (EFI_EDITOR_FILE_BUFFER));
+
+  //
+  // set default FileName
+  //
+  FileBuffer.FileName = EditGetDefaultFileName (L"txt");
+  if (FileBuffer.FileName == NULL) {
+    return EFI_LOAD_ERROR;
+  }
+
+  FileBuffer.ListHead = AllocateZeroPool (sizeof (LIST_ENTRY));
+  if (FileBuffer.ListHead == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  InitializeListHead (FileBuffer.ListHead);
+
+  FileBuffer.DisplayPosition.Row    = 2;
+  FileBuffer.DisplayPosition.Column = 1;
+  FileBuffer.LowVisibleRange.Row    = 2;
+  FileBuffer.LowVisibleRange.Column = 1;
+
+  FileBufferNeedRefresh             = FALSE;
+  FileBufferMouseNeedRefresh        = FALSE;
+  FileBufferOnlyLineNeedRefresh     = FALSE;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Backup function for FileBuffer.  Only backup the following items:
+      Mouse/Cursor position
+      File Name, Type, ReadOnly, Modified
+      Insert Mode
+
+  This is for making the file buffer refresh as few as possible.
+
+  @retval EFI_SUCCESS           The backup operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferBackup (
+  VOID
+  )
+{
+  FileBufferBackupVar.MousePosition = FileBuffer.MousePosition;
+
+  SHELL_FREE_NON_NULL (FileBufferBackupVar.FileName);
+  FileBufferBackupVar.FileName        = NULL;
+  FileBufferBackupVar.FileName        = StrnCatGrow (&FileBufferBackupVar.FileName, NULL, FileBuffer.FileName, 0);
+
+  FileBufferBackupVar.ModeInsert      = FileBuffer.ModeInsert;
+  FileBufferBackupVar.FileType        = FileBuffer.FileType;
+
+  FileBufferBackupVar.FilePosition    = FileBuffer.FilePosition;
+  FileBufferBackupVar.LowVisibleRange = FileBuffer.LowVisibleRange;
+
+  FileBufferBackupVar.FileModified    = FileBuffer.FileModified;
+  FileBufferBackupVar.ReadOnly        = FileBuffer.ReadOnly;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Advance to the next Count lines
+  
+  @param[in] Count              The line number to advance by.
+  @param[in] CurrentLine        The pointer to the current line structure.
+  @param[in] LineList           The pointer to the linked list of lines.
+
+  @retval NULL                  There was an error.
+  @return  The line structure after the advance.
+**/
+EFI_EDITOR_LINE *
+EFIAPI
+InternalEditorMiscLineAdvance (
+  IN CONST UINTN            Count,
+  IN CONST EFI_EDITOR_LINE  *CurrentLine,
+  IN CONST LIST_ENTRY       *LineList
+  )
+
+{
+  UINTN                 Index;
+  CONST EFI_EDITOR_LINE *Line;
+
+  if (CurrentLine == NULL || LineList == NULL) {
+    return NULL;
+  }
+
+  for (Line = CurrentLine, Index = 0; Index < Count; Index++) {
+    //
+    // if already last line
+    //
+    if (Line->Link.ForwardLink == LineList) {
+      return NULL;
+    }
+
+    Line = CR (Line->Link.ForwardLink, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+  }
+
+  return ((EFI_EDITOR_LINE *)Line);
+}
+
+/**
+  Retreat to the previous Count lines.
+  
+  @param[in] Count              The line number to retreat by.
+  @param[in] CurrentLine        The pointer to the current line structure.
+  @param[in] LineList           The pointer to the linked list of lines.
+
+  @retval NULL                  There was an error.
+  @return  The line structure after the retreat.
+**/
+EFI_EDITOR_LINE *
+EFIAPI
+InternalEditorMiscLineRetreat (
+  IN CONST UINTN            Count,
+  IN CONST EFI_EDITOR_LINE  *CurrentLine,
+  IN CONST LIST_ENTRY       *LineList
+  )
+
+{
+  UINTN                 Index;
+  CONST EFI_EDITOR_LINE *Line;
+
+  if (CurrentLine == NULL || LineList == NULL) {
+    return NULL;
+  }
+
+  for (Line = CurrentLine, Index = 0; Index < Count; Index++) {
+    //
+    // already the first line
+    //
+    if (Line->Link.BackLink == LineList) {
+      return NULL;
+    }
+
+    Line = CR (Line->Link.BackLink, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+  }
+
+  return ((EFI_EDITOR_LINE *)Line);
+}
+
+/**
+  Advance/Retreat lines
+  
+  @param[in] Count  line number to advance/retreat
+                       >0 : advance
+                       <0 : retreat
+
+  @retval NULL An error occured.
+  @return The line after advance/retreat.
+**/
+EFI_EDITOR_LINE *
+MoveLine (
+  IN CONST INTN Count
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           AbsCount;
+
+  //
+  // if < 0, then retreat
+  // if > 0, the advance
+  //
+  if (Count <= 0) {
+    AbsCount  = -Count;
+    Line      = InternalEditorMiscLineRetreat (AbsCount,MainEditor.FileBuffer->CurrentLine,MainEditor.FileBuffer->ListHead);
+  } else {
+    Line = InternalEditorMiscLineAdvance (Count,MainEditor.FileBuffer->CurrentLine,MainEditor.FileBuffer->ListHead);
+  }
+
+  return Line;
+}
+
+/**
+  Function to update the 'screen' to display the mouse position.
+
+  @retval EFI_SUCCESS           The backup operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferRestoreMousePosition (
+  VOID
+  )
+{
+  EFI_EDITOR_COLOR_UNION  Orig;
+  EFI_EDITOR_COLOR_UNION  New;
+  UINTN                   FRow;
+  UINTN                   FColumn;
+  BOOLEAN                 HasCharacter;
+  EFI_EDITOR_LINE         *CurrentLine;
+  EFI_EDITOR_LINE         *Line;
+  CHAR16                  Value;
+
+  //
+  // variable initialization
+  //
+  Line = NULL;
+
+  if (MainEditor.MouseSupported) {
+
+    if (FileBufferMouseNeedRefresh) {
+
+      FileBufferMouseNeedRefresh = FALSE;
+
+      //
+      // if mouse position not moved and only mouse action
+      // so do not need to refresh mouse position
+      //
+      if ((FileBuffer.MousePosition.Row == FileBufferBackupVar.MousePosition.Row &&
+          FileBuffer.MousePosition.Column == FileBufferBackupVar.MousePosition.Column)
+          && EditorMouseAction) {
+        return EFI_SUCCESS;
+      }
+      //
+      // backup the old screen attributes
+      //
+      Orig                  = MainEditor.ColorAttributes;
+      New.Colors.Foreground = Orig.Colors.Background;
+      New.Colors.Background = Orig.Colors.Foreground;
+
+      //
+      // clear the old mouse position
+      //
+      FRow          = FileBuffer.LowVisibleRange.Row + FileBufferBackupVar.MousePosition.Row - 2;
+
+      FColumn       = FileBuffer.LowVisibleRange.Column + FileBufferBackupVar.MousePosition.Column - 1;
+
+      HasCharacter  = TRUE;
+      if (FRow > FileBuffer.NumLines) {
+        HasCharacter = FALSE;
+      } else {
+        CurrentLine = FileBuffer.CurrentLine;
+        Line        = MoveLine (FRow - FileBuffer.FilePosition.Row);
+
+        if (FColumn > Line->Size) {
+          HasCharacter = FALSE;
+        }
+
+        FileBuffer.CurrentLine = CurrentLine;
+      }
+
+      ShellPrintEx (
+        (INT32)FileBufferBackupVar.MousePosition.Column - 1,
+        (INT32)FileBufferBackupVar.MousePosition.Row - 1,
+        L" "
+        );
+
+      if (HasCharacter) {
+        Value = (Line->Buffer[FColumn - 1]);
+        ShellPrintEx (
+          (INT32)FileBufferBackupVar.MousePosition.Column - 1,
+          (INT32)FileBufferBackupVar.MousePosition.Row - 1,
+          L"%c",
+          Value
+          );
+      }
+      //
+      // set the new mouse position
+      //
+      gST->ConOut->SetAttribute (gST->ConOut, New.Data);
+
+      //
+      // clear the old mouse position
+      //
+      FRow          = FileBuffer.LowVisibleRange.Row + FileBuffer.MousePosition.Row - 2;
+      FColumn       = FileBuffer.LowVisibleRange.Column + FileBuffer.MousePosition.Column - 1;
+
+      HasCharacter  = TRUE;
+      if (FRow > FileBuffer.NumLines) {
+        HasCharacter = FALSE;
+      } else {
+        CurrentLine = FileBuffer.CurrentLine;
+        Line        = MoveLine (FRow - FileBuffer.FilePosition.Row);
+
+        if (FColumn > Line->Size) {
+          HasCharacter = FALSE;
+        }
+
+        FileBuffer.CurrentLine = CurrentLine;
+      }
+
+      ShellPrintEx (
+        (INT32)FileBuffer.MousePosition.Column - 1,
+        (INT32)FileBuffer.MousePosition.Row - 1,
+        L" "
+        );
+
+      if (HasCharacter) {
+        Value = Line->Buffer[FColumn - 1];
+        ShellPrintEx (
+          (INT32)FileBuffer.MousePosition.Column - 1,
+          (INT32)FileBuffer.MousePosition.Row - 1,
+          L"%c",
+          Value
+          );
+      }
+      //
+      // end of HasCharacter
+      //
+      gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
+    }
+    //
+    // end of MouseNeedRefresh
+    //
+  }
+  //
+  // end of MouseSupported
+  //
+  return EFI_SUCCESS;
+}
+
+/**
+  Free all the lines in FileBuffer
+   Fields affected:
+     Lines
+     CurrentLine
+     NumLines
+     ListHead
+
+  @retval EFI_SUCCESS     The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferFreeLines (
+  VOID
+  )
+{
+  LIST_ENTRY  *Link;
+  EFI_EDITOR_LINE *Line;
+
+  //
+  // free all the lines
+  //
+  if (FileBuffer.Lines != NULL) {
+
+    Line  = FileBuffer.Lines;
+    Link  = &(Line->Link);
+    do {
+      Line  = CR (Link, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+      Link  = Link->ForwardLink;
+
+      //
+      // free line's buffer and line itself
+      //
+      LineFree (Line);
+    } while (Link != FileBuffer.ListHead);
+  }
+  //
+  // clean the line list related structure
+  //
+  FileBuffer.Lines            = NULL;
+  FileBuffer.CurrentLine      = NULL;
+  FileBuffer.NumLines         = 0;
+
+  FileBuffer.ListHead->ForwardLink  = FileBuffer.ListHead;
+  FileBuffer.ListHead->BackLink  = FileBuffer.ListHead;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Cleanup function for FileBuffer.
+
+  @retval EFI_SUCCESS   The cleanup was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferCleanup (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+
+  SHELL_FREE_NON_NULL (FileBuffer.FileName);
+
+  //
+  // free all the lines
+  //
+  Status = FileBufferFreeLines ();
+
+  SHELL_FREE_NON_NULL (FileBuffer.ListHead);
+  FileBuffer.ListHead = NULL;
+
+  SHELL_FREE_NON_NULL (FileBufferBackupVar.FileName);
+  return Status;
+
+}
+
+/**
+  Print a line specified by Line on a row specified by Row of the screen.
+
+  @param[in] Line               The line to print.
+  @param[in] Row                The row on the screen to print onto (begin from 1).
+
+  @retval EFI_SUCCESS           The printing was successful.
+**/
+EFI_STATUS
+FileBufferPrintLine (
+  IN CONST EFI_EDITOR_LINE  *Line,
+  IN CONST UINTN            Row
+  )
+{
+
+  CHAR16  *Buffer;
+  UINTN   Limit;
+  CHAR16  PrintLine[200];
+
+  //
+  // print start from correct character
+  //
+  Buffer  = Line->Buffer + FileBuffer.LowVisibleRange.Column - 1;
+
+  Limit   = Line->Size - FileBuffer.LowVisibleRange.Column + 1;
+  if (Limit > Line->Size) {
+    Limit = 0;
+  }
+
+  StrnCpy (PrintLine, Buffer, Limit > MainEditor.ScreenSize.Column ? MainEditor.ScreenSize.Column : Limit);
+  for (; Limit < MainEditor.ScreenSize.Column; Limit++) {
+    PrintLine[Limit] = L' ';
+  }
+
+  PrintLine[MainEditor.ScreenSize.Column] = CHAR_NULL;
+
+  ShellPrintEx (
+    0,
+    (INT32)Row - 1,
+    L"%s",
+    PrintLine
+    );
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Set the cursor position according to FileBuffer.DisplayPosition.
+
+  @retval EFI_SUCCESS           The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferRestorePosition (
+  VOID
+  )
+{
+  //
+  // set cursor position
+  //
+  return (gST->ConOut->SetCursorPosition (
+        gST->ConOut,
+        FileBuffer.DisplayPosition.Column - 1,
+        FileBuffer.DisplayPosition.Row - 1
+        ));
+}
+
+/**
+  Refresh the screen with whats in the buffer.
+
+  @retval EFI_SUCCESS     The refresh was successful.
+  @retval EFI_LOAD_ERROR  There was an error finding what to write.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferRefresh (
+  VOID
+  )
+{
+  LIST_ENTRY  *Link;
+  EFI_EDITOR_LINE *Line;
+  UINTN           Row;
+
+  //
+  // if it's the first time after editor launch, so should refresh
+  //
+  if (!EditorFirst) {
+    //
+    // no definite required refresh
+    // and file position displayed on screen has not been changed
+    //
+    if (!FileBufferNeedRefresh &&
+        !FileBufferOnlyLineNeedRefresh &&
+        FileBufferBackupVar.LowVisibleRange.Row == FileBuffer.LowVisibleRange.Row &&
+        FileBufferBackupVar.LowVisibleRange.Column == FileBuffer.LowVisibleRange.Column
+        ) {
+
+      FileBufferRestoreMousePosition ();
+      FileBufferRestorePosition ();
+
+      return EFI_SUCCESS;
+    }
+  }
+
+  gST->ConOut->EnableCursor (gST->ConOut, FALSE);
+
+  //
+  // only need to refresh current line
+  //
+  if (FileBufferOnlyLineNeedRefresh &&
+      FileBufferBackupVar.LowVisibleRange.Row == FileBuffer.LowVisibleRange.Row &&
+      FileBufferBackupVar.LowVisibleRange.Column == FileBuffer.LowVisibleRange.Column
+      ) {
+
+    EditorClearLine (FileBuffer.DisplayPosition.Row, MainEditor.ScreenSize.Column, MainEditor.ScreenSize.Row);
+    FileBufferPrintLine (
+      FileBuffer.CurrentLine,
+      FileBuffer.DisplayPosition.Row
+      );
+  } else {
+    //
+    // the whole edit area need refresh
+    //
+
+    //
+    // no line
+    //
+    if (FileBuffer.Lines == NULL) {
+      FileBufferRestoreMousePosition ();
+      FileBufferRestorePosition ();
+      gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+
+      return EFI_SUCCESS;
+    }
+    //
+    // get the first line that will be displayed
+    //
+    Line = MoveLine (FileBuffer.LowVisibleRange.Row - FileBuffer.FilePosition.Row);
+    if (Line == NULL) {
+      gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+
+      return EFI_LOAD_ERROR;
+    }
+
+    Link  = &(Line->Link);
+    Row   = 2;
+    do {
+      Line = CR (Link, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+
+      //
+      // print line at row
+      //
+      FileBufferPrintLine (Line, Row);
+
+      Link = Link->ForwardLink;
+      Row++;
+    } while (Link != FileBuffer.ListHead && Row <= (MainEditor.ScreenSize.Row - 4));
+    //
+    // while not file end and not screen full
+    //
+    while (Row <= (MainEditor.ScreenSize.Row - 4)) {
+      EditorClearLine (Row, MainEditor.ScreenSize.Column, MainEditor.ScreenSize.Row);
+      Row++;
+    }
+  }
+
+  FileBufferRestoreMousePosition ();
+  FileBufferRestorePosition ();
+
+  FileBufferNeedRefresh         = FALSE;
+  FileBufferOnlyLineNeedRefresh = FALSE;
+
+  gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+  return EFI_SUCCESS;
+}
+
+/**
+  Create a new line and append it to the line list.
+    Fields affected:
+      NumLines
+      Lines
+
+  @retval NULL    The create line failed.
+  @return         The line created.
+**/
+EFI_EDITOR_LINE *
+EFIAPI
+FileBufferCreateLine (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+
+  //
+  // allocate a line structure
+  //
+  Line = AllocateZeroPool (sizeof (EFI_EDITOR_LINE));
+  if (Line == NULL) {
+    return NULL;
+  }
+  //
+  // initialize the structure
+  //
+  Line->Signature = LINE_LIST_SIGNATURE;
+  Line->Size      = 0;
+  Line->TotalSize = 0;
+  Line->Type      = NewLineTypeDefault;
+
+  //
+  // initial buffer of the line is "\0"
+  //
+  ASSERT(CHAR_NULL == CHAR_NULL);
+  Line->Buffer = CatSPrint (NULL, L"\0");
+  if (Line->Buffer == NULL) {
+    return NULL;
+  }
+
+  FileBuffer.NumLines++;
+
+  //
+  // insert the line into line list
+  //
+  InsertTailList (FileBuffer.ListHead, &Line->Link);
+
+  if (FileBuffer.Lines == NULL) {
+    FileBuffer.Lines = CR (FileBuffer.ListHead->ForwardLink, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+  }
+
+  return Line;
+}
+
+/**
+  Set FileName field in FileBuffer.
+
+  @param Str                    The file name to set.
+  
+  @retval EFI_SUCCESS           The filename was successfully set.
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+  @retval EFI_INVALID_PARAMETER Str is not a valid filename.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferSetFileName (
+  IN CONST CHAR16 *Str
+  )
+{
+  //
+  // Verify the parameters
+  //
+  if (!IsValidFileName(Str)) {
+    return (EFI_INVALID_PARAMETER);
+  }
+  //
+  // free the old file name
+  //
+  SHELL_FREE_NON_NULL (FileBuffer.FileName);
+
+  //
+  // Allocate and set the new name
+  //
+  FileBuffer.FileName = CatSPrint (NULL, L"%s", Str);
+  if (FileBuffer.FileName == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  return EFI_SUCCESS;
+}
+/**
+  Free the existing file lines and reset the modified flag.
+
+  @retval EFI_SUCCESS           The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferFree (
+  VOID
+  )
+{
+  //
+  // free all the lines
+  //
+  FileBufferFreeLines ();
+  FileBuffer.FileModified = FALSE;
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Read a file from disk into the FileBuffer.
+  
+  @param[in] FileName           The filename to read.
+  @param[in] Recover            TRUE if is for recover mode, no information printouts.
+  
+  @retval EFI_SUCCESS            The load was successful.
+  @retval EFI_LOAD_ERROR         The load failed.
+  @retval EFI_OUT_OF_RESOURCES   A memory allocation failed.
+  @retval EFI_INVALID_PARAMETER  FileName is a directory.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferRead (
+  IN CONST CHAR16  *FileName,
+  IN CONST BOOLEAN Recover
+  )
+{
+  EFI_EDITOR_LINE                 *Line;
+  EE_NEWLINE_TYPE                 Type;
+  UINTN                           LoopVar1;
+  UINTN                           LoopVar2;
+  UINTN                           LineSize;
+  VOID                            *Buffer;
+  CHAR16                          *UnicodeBuffer;
+  UINT8                           *AsciiBuffer;
+  UINTN                           FileSize;
+  SHELL_FILE_HANDLE               FileHandle;
+  BOOLEAN                         CreateFile;
+  EFI_STATUS                      Status;
+  UINTN                           LineSizeBackup;
+  EFI_FILE_INFO                   *Info;
+
+  Line          = NULL;
+  LoopVar1      = 0;
+  FileSize      = 0;
+  UnicodeBuffer = NULL;
+  Type          = NewLineTypeDefault;
+  FileHandle    = NULL;
+  CreateFile    = FALSE;
+
+  //
+  // in this function, when you return error ( except EFI_OUT_OF_RESOURCES )
+  // you should set status string via StatusBarSetStatusString(L"blah")
+  // since this function maybe called before the editorhandleinput loop
+  // so any error will cause editor return
+  // so if you want to print the error status
+  // you should set the status string
+  //
+
+  //
+  // try to open the file
+  //
+  Status = ShellOpenFileByName (FileName, &FileHandle, EFI_FILE_MODE_READ, 0);
+
+  if (!EFI_ERROR(Status)) {
+    CreateFile = FALSE;
+    if (FileHandle == NULL) {
+      StatusBarSetStatusString (L"Disk Error");
+      return EFI_LOAD_ERROR;
+    }
+
+    Info = ShellGetFileInfo(FileHandle);
+    
+    if (Info->Attribute & EFI_FILE_DIRECTORY) {
+      StatusBarSetStatusString (L"Directory Can Not Be Edited");
+      FreePool (Info);
+      return EFI_INVALID_PARAMETER;
+    }
+
+    if (Info->Attribute & EFI_FILE_READ_ONLY) {
+      FileBuffer.ReadOnly = TRUE;
+    } else {
+      FileBuffer.ReadOnly = FALSE;
+    }
+    //
+    // get file size
+    //
+    FileSize = (UINTN) Info->FileSize;
+
+    FreePool (Info);
+  } else if (Status == EFI_NOT_FOUND) {
+    //
+    // file not exists.  add create and try again
+    //
+    Status = ShellOpenFileByName (FileName, &FileHandle, EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE|EFI_FILE_MODE_CREATE, 0);
+    if (EFI_ERROR (Status)) {
+      if (Status == EFI_WRITE_PROTECTED ||
+          Status == EFI_ACCESS_DENIED ||
+          Status == EFI_NO_MEDIA ||
+          Status == EFI_MEDIA_CHANGED
+          ) {
+        StatusBarSetStatusString (L"Access Denied");
+      } else if (Status == EFI_DEVICE_ERROR || Status == EFI_VOLUME_CORRUPTED || Status == EFI_VOLUME_FULL) {
+        StatusBarSetStatusString (L"Disk Error");
+      } else {
+        StatusBarSetStatusString (L"Invalid File Name or Current-working-directory");
+      }
+
+      return Status;
+    } else {
+      //
+      // it worked.  now delete it and move on with the name (now validated)
+      //
+      Status = ShellDeleteFile (&FileHandle);
+      if (Status == EFI_WARN_DELETE_FAILURE) {
+        Status = EFI_ACCESS_DENIED;
+      }
+      FileHandle = NULL;
+      if (EFI_ERROR (Status)) {
+        StatusBarSetStatusString (L"Access Denied");
+        return Status;
+      }
+    }
+    //
+    // file doesn't exist, so set CreateFile to TRUE
+    //
+    CreateFile          = TRUE;
+    FileBuffer.ReadOnly = FALSE;
+
+    //
+    // all the check ends
+    // so now begin to set file name, free lines
+    //
+    if (StrCmp (FileName, FileBuffer.FileName) != 0) {
+      FileBufferSetFileName (FileName);
+    }
+    //
+    // free the old lines
+    //
+    FileBufferFree ();
+
+  }
+  //
+  // the file exists
+  //
+  if (!CreateFile) {
+    //
+    // allocate buffer to read file
+    //
+    Buffer = AllocateZeroPool (FileSize);
+    if (Buffer == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+    //
+    // read file into Buffer
+    //
+    Status = ShellReadFile (FileHandle, &FileSize, Buffer);
+    ShellCloseFile(&FileHandle);
+    FileHandle = NULL;
+    if (EFI_ERROR (Status)) {
+      StatusBarSetStatusString (L"Read File Failed");
+      SHELL_FREE_NON_NULL (Buffer);
+      return EFI_LOAD_ERROR;
+    }
+    //
+    // nothing in this file
+    //
+    if (FileSize == 0) {
+      SHELL_FREE_NON_NULL (Buffer);
+      //
+      // since has no head, so only can be an ASCII file
+      //
+      FileBuffer.FileType = FileTypeAscii;
+
+      goto Done;
+    }
+
+    AsciiBuffer = Buffer;
+
+    if (FileSize < 2) {
+      //
+      // size < Unicode file header, so only can be ASCII file
+      //
+      FileBuffer.FileType = FileTypeAscii;
+    } else {
+      //
+      // Unicode file
+      //
+      if (*(UINT16 *) Buffer == EFI_UNICODE_BYTE_ORDER_MARK) {
+        //
+        // Unicode file's size should be even
+        //
+        if ((FileSize % 2) != 0) {
+          StatusBarSetStatusString (L"File Format Wrong");
+          SHELL_FREE_NON_NULL (Buffer);
+          return EFI_LOAD_ERROR;
+        }
+
+        FileSize /= 2;
+
+        FileBuffer.FileType = FileTypeUnicode;
+        UnicodeBuffer       = Buffer;
+
+        //
+        // pass this 0xff and 0xfe
+        //
+        UnicodeBuffer++;
+        FileSize--;
+      } else {
+        FileBuffer.FileType = FileTypeAscii;
+      }
+      //
+      // end of AsciiBuffer ==
+      //
+    }
+    //
+    // end of FileSize < 2
+    // all the check ends
+    // so now begin to set file name, free lines
+    //
+    if (StrCmp (FileName, FileBuffer.FileName) != 0) {
+      FileBufferSetFileName (FileName);
+    }
+
+    //
+    // free the old lines
+    //
+    FileBufferFree ();
+
+    //
+    // parse file content line by line
+    //
+    for (LoopVar1 = 0; LoopVar1 < FileSize; LoopVar1++) {
+      Type = NewLineTypeUnknown;
+
+      for (LineSize = LoopVar1; LineSize < FileSize; LineSize++) {
+        if (FileBuffer.FileType == FileTypeAscii) {
+          if (AsciiBuffer[LineSize] == CHAR_CARRIAGE_RETURN) {
+            Type = NewLineTypeCarriageReturn;
+
+            //
+            // has LF following
+            //
+            if (LineSize < FileSize - 1) {
+              if (AsciiBuffer[LineSize + 1] == CHAR_LINEFEED) {
+                Type = NewLineTypeCarriageReturnLineFeed;
+              }
+            }
+
+            break;
+          } else if (AsciiBuffer[LineSize] == CHAR_LINEFEED) {
+            Type = NewLineTypeLineFeed;
+
+            //
+            // has CR following
+            //
+            if (LineSize < FileSize - 1) {
+              if (AsciiBuffer[LineSize + 1] == CHAR_CARRIAGE_RETURN) {
+                Type = NewLineTypeLineFeedCarriageReturn;
+              }
+            }
+
+            break;
+          }
+        } else {
+          if (UnicodeBuffer[LineSize] == CHAR_CARRIAGE_RETURN) {
+            Type = NewLineTypeCarriageReturn;
+
+            //
+            // has LF following
+            //
+            if (LineSize < FileSize - 1) {
+              if (UnicodeBuffer[LineSize + 1] == CHAR_LINEFEED) {
+                Type = NewLineTypeCarriageReturnLineFeed;
+              }
+            }
+
+            break;
+          } else if (UnicodeBuffer[LineSize] == CHAR_LINEFEED) {
+            Type = NewLineTypeLineFeed;
+
+            //
+            // has CR following
+            //
+            if (LineSize < FileSize - 1) {
+              if (UnicodeBuffer[LineSize + 1] == CHAR_CARRIAGE_RETURN) {
+                Type = NewLineTypeLineFeedCarriageReturn;
+              }
+            }
+
+            break;
+          }
+        }
+        //
+        // endif == ASCII
+        //
+      }
+      //
+      // end of for LineSize
+      //
+      // if the type is wrong, then exit
+      //
+      if (Type == NewLineTypeUnknown) {
+        //
+        // Now if Type is NewLineTypeUnknown, it should be file end
+        //
+        Type = NewLineTypeDefault;
+      }
+
+      LineSizeBackup = LineSize;
+
+      //
+      // create a new line
+      //
+      Line = FileBufferCreateLine ();
+      if (Line == NULL) {
+        SHELL_FREE_NON_NULL (Buffer);
+        return EFI_OUT_OF_RESOURCES;
+      }
+      //
+      // calculate file length
+      //
+      LineSize -= LoopVar1;
+
+      //
+      // Unicode and one CHAR_NULL
+      //
+      SHELL_FREE_NON_NULL (Line->Buffer);
+      Line->Buffer = AllocateZeroPool (LineSize * 2 + 2);
+
+      if (Line->Buffer == NULL) {
+        RemoveEntryList (&Line->Link);
+        return EFI_OUT_OF_RESOURCES;
+      }
+      //
+      // copy this line to Line->Buffer
+      //
+      for (LoopVar2 = 0; LoopVar2 < LineSize; LoopVar2++) {
+        if (FileBuffer.FileType == FileTypeAscii) {
+          Line->Buffer[LoopVar2] = (CHAR16) AsciiBuffer[LoopVar1];
+        } else {
+          Line->Buffer[LoopVar2] = UnicodeBuffer[LoopVar1];
+        }
+
+        LoopVar1++;
+      }
+      //
+      // LoopVar1 now points to where CHAR_CARRIAGE_RETURN or CHAR_LINEFEED;
+      //
+      Line->Buffer[LineSize]  = 0;
+
+      Line->Size              = LineSize;
+      Line->TotalSize         = LineSize;
+      Line->Type              = Type;
+
+      if (Type == NewLineTypeCarriageReturnLineFeed || Type == NewLineTypeLineFeedCarriageReturn) {
+        LoopVar1++;
+      }
+
+      //
+      // last character is a return, SO create a new line
+      //
+      if (((Type == NewLineTypeCarriageReturnLineFeed || Type == NewLineTypeLineFeedCarriageReturn) && LineSizeBackup == FileSize - 2) ||
+          ((Type == NewLineTypeLineFeed || Type == NewLineTypeCarriageReturn) && LineSizeBackup == FileSize - 1)
+          ) {
+        Line = FileBufferCreateLine ();
+        if (Line == NULL) {
+          SHELL_FREE_NON_NULL (Buffer);
+          return EFI_OUT_OF_RESOURCES;
+        }
+      }
+      //
+      // end of if
+      //
+    }
+    //
+    // end of LoopVar1
+    //
+    SHELL_FREE_NON_NULL (Buffer);
+
+  }
+  //
+  // end of if CreateFile
+  //
+Done:
+
+  FileBuffer.DisplayPosition.Row    = 2;
+  FileBuffer.DisplayPosition.Column = 1;
+  FileBuffer.LowVisibleRange.Row    = 1;
+  FileBuffer.LowVisibleRange.Column = 1;
+  FileBuffer.FilePosition.Row       = 1;
+  FileBuffer.FilePosition.Column    = 1;
+  FileBuffer.MousePosition.Row      = 2;
+  FileBuffer.MousePosition.Column   = 1;
+
+  if (!Recover) {
+    UnicodeBuffer = CatSPrint (NULL, L"%d Lines Read", FileBuffer.NumLines);
+    if (UnicodeBuffer == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    StatusBarSetStatusString (UnicodeBuffer);
+    FreePool (UnicodeBuffer);
+  }
+/*
+    //
+    // check whether we have fs?: in filename
+    //
+    LoopVar1             = 0;
+    FSMappingPtr  = NULL;
+    while (FileName[LoopVar1] != 0) {
+      if (FileName[LoopVar1] == L':') {
+        FSMappingPtr = &FileName[LoopVar1];
+        break;
+      }
+
+      LoopVar1++;
+    }
+
+    if (FSMappingPtr == NULL) {
+      CurDir = ShellGetCurrentDir (NULL);
+    } else {
+      LoopVar1 = 0;
+      LoopVar2 = 0;
+      while (FileName[LoopVar1] != 0) {
+        if (FileName[LoopVar1] == L':') {
+          break;
+        }
+
+        FSMapping[LoopVar2++] = FileName[LoopVar1];
+
+        LoopVar1++;
+      }
+
+      FSMapping[LoopVar2]  = 0;
+      CurDir        = ShellGetCurrentDir (FSMapping);
+    }
+
+    if (CurDir != NULL) {
+      for (LoopVar1 = 0; LoopVar1 < StrLen (CurDir) && CurDir[LoopVar1] != ':'; LoopVar1++);
+
+      CurDir[LoopVar1]   = 0;
+      DevicePath  = (EFI_DEVICE_PATH_PROTOCOL *) ShellGetMap (CurDir);
+      FreePool (CurDir);
+    } else {
+      return EFI_LOAD_ERROR;
+    }
+
+    Status = LibDevicePathToInterface (
+              &gEfiSimpleFileSystemProtocolGuid,
+              DevicePath,
+              (VOID **) &Vol
+              );
+    if (EFI_ERROR (Status)) {
+      return EFI_LOAD_ERROR;
+    }
+
+    Status = Vol->OpenVolume (Vol, &RootFs);
+    if (EFI_ERROR (Status)) {
+      return EFI_LOAD_ERROR;
+    }
+    //
+    // Get volume information of file system
+    //
+    Size        = SIZE_OF_EFI_FILE_SYSTEM_INFO + 100;
+    VolumeInfo  = (EFI_FILE_SYSTEM_INFO *) AllocateZeroPool (Size);
+    Status      = RootFs->GetInfo (RootFs, &gEfiFileSystemInfoGuid, &Size, VolumeInfo);
+    if (EFI_ERROR (Status)) {
+      RootFs->Close (RootFs);
+      return EFI_LOAD_ERROR;
+    }
+
+    if (VolumeInfo->ReadOnly) {
+      StatusBarSetStatusString (L"WARNING: Volume Read Only");
+    }
+
+    FreePool (VolumeInfo);
+    RootFs->Close (RootFs);
+  }
+//
+*/
+  //
+  // has line
+  //
+  if (FileBuffer.Lines != 0) {
+    FileBuffer.CurrentLine = CR (FileBuffer.ListHead->ForwardLink, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+  } else {
+    //
+    // create a dummy line
+    //
+    Line = FileBufferCreateLine ();
+    if (Line == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    FileBuffer.CurrentLine = Line;
+  }
+
+  FileBuffer.FileModified       = FALSE;
+  FileBufferNeedRefresh         = TRUE;
+  FileBufferOnlyLineNeedRefresh = FALSE;
+  FileBufferMouseNeedRefresh    = TRUE;
+
+
+  return EFI_SUCCESS;
+}
+
+/**
+  According to FileBuffer.NewLineType & FileBuffer.FileType,
+  get the return buffer and size.
+
+  @param[in] Type               The type of line.
+  @param[out] Buffer            The buffer to fill.
+  @param[out] Size              The amount of the buffer used on return.
+**/
+VOID
+EFIAPI
+GetNewLine (
+  IN CONST EE_NEWLINE_TYPE Type,
+  OUT CHAR8           *Buffer,
+  OUT UINT8           *Size
+  )
+{
+  UINT8 NewLineSize;
+
+  //
+  // give new line buffer,
+  // and will judge unicode or ascii
+  //
+  NewLineSize = 0;
+
+  //
+  // not legal new line type
+  //
+  if (Type != NewLineTypeLineFeed && Type != NewLineTypeCarriageReturn && Type != NewLineTypeCarriageReturnLineFeed && Type != NewLineTypeLineFeedCarriageReturn) {
+    *Size = 0;
+    return ;
+  }
+  //
+  // use_cr: give 0x0d
+  //
+  if (Type == NewLineTypeCarriageReturn) {
+    if (MainEditor.FileBuffer->FileType == FileTypeUnicode) {
+      Buffer[0]   = 0x0d;
+      Buffer[1]   = 0;
+      NewLineSize = 2;
+    } else {
+      Buffer[0]   = 0x0d;
+      NewLineSize = 1;
+    }
+
+    *Size = NewLineSize;
+    return ;
+  }
+  //
+  // use_lf: give 0x0a
+  //
+  if (Type == NewLineTypeLineFeed) {
+    if (MainEditor.FileBuffer->FileType == FileTypeUnicode) {
+      Buffer[0]   = 0x0a;
+      Buffer[1]   = 0;
+      NewLineSize = 2;
+    } else {
+      Buffer[0]   = 0x0a;
+      NewLineSize = 1;
+    }
+
+    *Size = NewLineSize;
+    return ;
+  }
+  //
+  // use_crlf: give 0x0d 0x0a
+  //
+  if (Type == NewLineTypeCarriageReturnLineFeed) {
+    if (MainEditor.FileBuffer->FileType == FileTypeUnicode) {
+      Buffer[0]   = 0x0d;
+      Buffer[1]   = 0;
+      Buffer[2]   = 0x0a;
+      Buffer[3]   = 0;
+
+      NewLineSize = 4;
+    } else {
+      Buffer[0]   = 0x0d;
+      Buffer[1]   = 0x0a;
+      NewLineSize = 2;
+    }
+
+    *Size = NewLineSize;
+    return ;
+  }
+  //
+  // use_lfcr: give 0x0a 0x0d
+  //
+  if (Type == NewLineTypeLineFeedCarriageReturn) {
+    if (MainEditor.FileBuffer->FileType == FileTypeUnicode) {
+      Buffer[0]   = 0x0a;
+      Buffer[1]   = 0;
+      Buffer[2]   = 0x0d;
+      Buffer[3]   = 0;
+
+      NewLineSize = 4;
+    } else {
+      Buffer[0]   = 0x0a;
+      Buffer[1]   = 0x0d;
+      NewLineSize = 2;
+    }
+
+    *Size = NewLineSize;
+    return ;
+  }
+
+}
+
+/**
+  Change a Unicode string to an ASCII string.
+
+  @param[in] UStr     The Unicode string.
+  @param[in] Lenght   The maximum size of AStr.
+  @param[out] AStr    ASCII string to pass out.
+
+  @return The actuall length.
+**/
+UINTN
+EFIAPI
+UnicodeToAscii (
+  IN CONST CHAR16  *UStr,
+  IN CONST UINTN   Length,
+  OUT CHAR8   *AStr
+  )
+{
+  UINTN Index;
+
+  //
+  // just buffer copy, not character copy
+  //
+  for (Index = 0; Index < Length; Index++) {
+    *AStr++ = (CHAR8) *UStr++;
+  }
+
+  return Index;
+}
+
+/**
+  Save lines in FileBuffer to disk
+
+  @param[in] FileName           The file name for writing.
+
+  @retval EFI_SUCCESS           Data was written.
+  @retval EFI_LOAD_ERROR        
+  @retval EFI_OUT_OF_RESOURCES  There were not enough resources to write the file.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferSave (
+  IN CONST CHAR16 *FileName
+  )
+{
+  SHELL_FILE_HANDLE FileHandle;
+  LIST_ENTRY        *Link;
+  EFI_EDITOR_LINE   *Line;
+  CHAR16            *Str;
+
+  EFI_STATUS        Status;
+  UINTN             Length;
+  UINTN             NumLines;
+  CHAR8             NewLineBuffer[4];
+  UINT8             NewLineSize;
+
+  EFI_FILE_INFO     *Info;
+
+  UINT64            Attribute;
+
+  EE_NEWLINE_TYPE   Type;
+
+  UINTN             TotalSize;
+  //
+  // 2M
+  //
+  CHAR8             *Cache;
+  UINTN             LeftSize;
+  UINTN             Size;
+  CHAR8             *Ptr;
+
+  Length    = 0;
+  //
+  // 2M
+  //
+  TotalSize = 0x200000;
+
+  Attribute = 0;
+
+
+
+  //
+  // if is the old file
+  //
+  if (StrCmp (FileName, FileBuffer.FileName) == 0) {
+    //
+    // file has not been modified
+    //
+    if (!FileBuffer.FileModified) {
+      return EFI_SUCCESS;
+    }
+
+    //
+    // if file is read-only, set error
+    //
+    if (FileBuffer.ReadOnly) {
+      StatusBarSetStatusString (L"Read Only File Can Not Be Saved");
+      return EFI_SUCCESS;
+    }
+  }
+
+  Status = ShellOpenFileByName (FileName, &FileHandle, EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE, 0);
+
+  if (!EFI_ERROR (Status)) {
+    Info = ShellGetFileInfo(FileHandle);
+
+    if (Info != NULL && Info->Attribute & EFI_FILE_DIRECTORY) {
+      StatusBarSetStatusString (L"Directory Can Not Be Saved");
+      ShellCloseFile(FileHandle);
+      FreePool(Info);
+      return EFI_LOAD_ERROR;
+    }
+    
+    if (Info != NULL) {
+      Attribute = Info->Attribute & ~EFI_FILE_READ_ONLY;
+      FreePool(Info);
+    }
+
+    //
+    // if file exits, so delete it
+    //
+    Status = ShellDeleteFile (&FileHandle);
+    if (EFI_ERROR (Status) || Status == EFI_WARN_DELETE_FAILURE) {
+      StatusBarSetStatusString (L"Write File Failed");
+      return EFI_LOAD_ERROR;
+    }
+ }
+
+  Status = ShellOpenFileByName (FileName, &FileHandle, EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE|EFI_FILE_MODE_CREATE, Attribute);
+
+  if (EFI_ERROR (Status)) {
+    StatusBarSetStatusString (L"Create File Failed");
+    return EFI_LOAD_ERROR;
+  }
+
+  //
+  // if file is Unicode file, write Unicode header to it.
+  //
+  if (FileBuffer.FileType == FileTypeUnicode) {
+    Length  = 2;
+    Status  = ShellWriteFile (FileHandle, &Length, (VOID*)&gUnicodeFileTag);
+    if (EFI_ERROR (Status)) {
+      ShellDeleteFile (&FileHandle);
+      return EFI_LOAD_ERROR;
+    }
+  }
+
+  Cache = AllocateZeroPool (TotalSize);
+  if (Cache == NULL) {
+    ShellDeleteFile (&FileHandle);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  //
+  // write all the lines back to disk
+  //
+  NumLines  = 0;
+  Type      = NewLineTypeCarriageReturnLineFeed;
+
+  Ptr       = Cache;
+  LeftSize  = TotalSize;
+
+  for (Link = FileBuffer.ListHead->ForwardLink; Link != FileBuffer.ListHead; Link = Link->ForwardLink) {
+    Line = CR (Link, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+
+    if (Line->Type != NewLineTypeDefault) {
+      Type = Line->Type;
+    }
+    //
+    // newline character is at most 4 bytes ( two Unicode characters )
+    //
+    Length = 4;
+    if (Line->Buffer != NULL && Line->Size != 0) {
+      if (FileBuffer.FileType == FileTypeAscii) {
+        Length += Line->Size;
+      } else {
+        Length += (Line->Size * 2);
+      }
+      //
+      // end if FileTypeAscii
+      //
+    }
+
+    //
+    // no cache room left, so write cache to disk
+    //
+    if (LeftSize < Length) {
+      Size    = TotalSize - LeftSize;
+      Status  = ShellWriteFile (FileHandle, &Size, Cache);
+      if (EFI_ERROR (Status)) {
+        ShellDeleteFile (&FileHandle);        
+        FreePool (Cache);
+        return EFI_LOAD_ERROR;
+      }
+      Ptr       = Cache;
+      LeftSize  = TotalSize;
+    }
+
+    if (Line->Buffer != NULL && Line->Size != 0) {
+      if (FileBuffer.FileType == FileTypeAscii) {
+        UnicodeToAscii (Line->Buffer, Line->Size, Ptr);
+        Length = Line->Size;
+      } else {
+        Length = (Line->Size * 2);
+        CopyMem (Ptr, (CHAR8 *) Line->Buffer, Length);
+      }
+      //
+      // end if FileTypeAscii
+      //
+      Ptr += Length;
+      LeftSize -= Length;
+
+    }
+    //
+    // end of if Line -> Buffer != NULL && Line -> Size != 0
+    //
+    // if not the last line , write return buffer to disk
+    //
+    if (Link->ForwardLink != FileBuffer.ListHead) {
+      GetNewLine (Type, NewLineBuffer, &NewLineSize);
+      CopyMem (Ptr, (CHAR8 *) NewLineBuffer, NewLineSize);
+
+      Ptr += NewLineSize;
+      LeftSize -= NewLineSize;
+    }
+
+    NumLines++;
+  }
+
+  if (TotalSize != LeftSize) {
+    Size    = TotalSize - LeftSize;
+    Status  = ShellWriteFile (FileHandle, &Size, Cache);
+    if (EFI_ERROR (Status)) {
+      ShellDeleteFile (&FileHandle);
+      FreePool (Cache);
+      return EFI_LOAD_ERROR;
+    }
+  }
+
+  FreePool (Cache);
+
+  ShellCloseFile(&FileHandle);
+
+  FileBuffer.FileModified = FALSE;
+
+  //
+  // set status string
+  //
+  Str = CatSPrint (NULL, L"%d Lines Wrote", NumLines);
+  if (Str == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  StatusBarSetStatusString (Str);
+  SHELL_FREE_NON_NULL (Str);
+
+  //
+  // now everything is ready , you can set the new file name to filebuffer
+  //
+  if (StrCmp (FileName, FileBuffer.FileName) != 0) {
+    //
+    // not the same
+    //
+    FileBufferSetFileName (FileName);
+    if (FileBuffer.FileName == NULL) {
+      ShellDeleteFile (&FileHandle);
+      return EFI_OUT_OF_RESOURCES;
+    }
+  }
+
+  FileBuffer.ReadOnly = FALSE;
+  return EFI_SUCCESS;
+}
+
+/**
+  Scroll cursor to left 1 character position.
+
+  @retval EFI_SUCCESS     The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferScrollLeft (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           FRow;
+  UINTN           FCol;
+
+  Line  = FileBuffer.CurrentLine;
+
+  FRow  = FileBuffer.FilePosition.Row;
+  FCol  = FileBuffer.FilePosition.Column;
+
+  //
+  // if already at start of this line, so move to the end of previous line
+  //
+  if (FCol <= 1) {
+    //
+    // has previous line
+    //
+    if (Line->Link.BackLink != FileBuffer.ListHead) {
+      FRow--;
+      Line  = CR (Line->Link.BackLink, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+      FCol  = Line->Size + 1;
+    } else {
+      return EFI_SUCCESS;
+    }
+  } else {
+    //
+    // if not at start of this line, just move to previous column
+    //
+    FCol--;
+  }
+
+  FileBufferMovePosition (FRow, FCol);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Delete a char in line
+
+  @param[in,out] Line   The line to delete in.
+  @param[in] Pos        Position to delete the char at ( start from 0 ).
+**/
+VOID
+EFIAPI
+LineDeleteAt (
+  IN  OUT EFI_EDITOR_LINE       *Line,
+  IN      UINTN                 Pos
+  )
+{
+  UINTN Index;
+
+  //
+  // move the latter characters front
+  //
+  for (Index = Pos - 1; Index < Line->Size; Index++) {
+    Line->Buffer[Index] = Line->Buffer[Index + 1];
+  }
+
+  Line->Size--;
+}
+
+/**
+  Concatenate Src into Dest.
+
+  @param[in,out] Dest   Destination string
+  @param[in] Src        Src String.
+**/
+VOID
+EFIAPI
+LineCat (
+  IN  OUT EFI_EDITOR_LINE *Dest,
+  IN      EFI_EDITOR_LINE *Src
+  )
+{
+  CHAR16  *Str;
+  UINTN   Size;
+
+  Size                = Dest->Size;
+
+  Dest->Buffer[Size]  = 0;
+
+  //
+  // concatenate the two strings
+  //
+  Str = CatSPrint (NULL, L"%s%s", Dest->Buffer, Src->Buffer);
+  if (Str == NULL) {
+    Dest->Buffer = NULL;
+    return ;
+  }
+
+  Dest->Size      = Size + Src->Size;
+  Dest->TotalSize = Dest->Size;
+
+  FreePool (Dest->Buffer);
+  FreePool (Src->Buffer);
+
+  //
+  // put str to dest->buffer
+  //
+  Dest->Buffer = Str;
+}
+
+/**
+  Delete the previous character.
+
+  @retval EFI_SUCCESS           The delete was successful.
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferDoBackspace (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  EFI_EDITOR_LINE *End;
+  LIST_ENTRY  *Link;
+  UINTN           FileColumn;
+
+  FileColumn  = FileBuffer.FilePosition.Column;
+
+  Line        = FileBuffer.CurrentLine;
+
+  //
+  // the first column
+  //
+  if (FileColumn == 1) {
+    //
+    // the first row
+    //
+    if (FileBuffer.FilePosition.Row == 1) {
+      return EFI_SUCCESS;
+    }
+
+    FileBufferScrollLeft ();
+
+    Line  = FileBuffer.CurrentLine;
+    Link  = Line->Link.ForwardLink;
+    End   = CR (Link, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+
+    //
+    // concatenate this line with previous line
+    //
+    LineCat (Line, End);
+    if (Line->Buffer == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+    //
+    // remove End from line list
+    //
+    RemoveEntryList (&End->Link);
+    FreePool (End);
+
+    FileBuffer.NumLines--;
+
+    FileBufferNeedRefresh         = TRUE;
+    FileBufferOnlyLineNeedRefresh = FALSE;
+
+  } else {
+    //
+    // just delete the previous character
+    //
+    LineDeleteAt (Line, FileColumn - 1);
+    FileBufferScrollLeft ();
+    FileBufferOnlyLineNeedRefresh = TRUE;
+  }
+
+  if (!FileBuffer.FileModified) {
+    FileBuffer.FileModified = TRUE;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Add a return into line at current position.
+
+  @retval EFI_SUCCESS           The insetrion of the character was successful.
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferDoReturn (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  EFI_EDITOR_LINE *NewLine;
+  UINTN           FileColumn;
+  UINTN           Index;
+  CHAR16          *Buffer;
+  UINTN           Row;
+  UINTN           Col;
+
+  FileBufferNeedRefresh         = TRUE;
+  FileBufferOnlyLineNeedRefresh = FALSE;
+
+  Line                          = FileBuffer.CurrentLine;
+
+  FileColumn                    = FileBuffer.FilePosition.Column;
+
+  NewLine                       = AllocateZeroPool (sizeof (EFI_EDITOR_LINE));
+  if (NewLine == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  NewLine->Signature  = LINE_LIST_SIGNATURE;
+  NewLine->Size       = Line->Size - FileColumn + 1;
+  NewLine->TotalSize  = NewLine->Size;
+  NewLine->Buffer     = CatSPrint (NULL, L"\0");
+  if (NewLine->Buffer == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  NewLine->Type = NewLineTypeDefault;
+
+  if (NewLine->Size > 0) {
+    //
+    // UNICODE + CHAR_NULL
+    //
+    Buffer = AllocateZeroPool (2 * (NewLine->Size + 1));
+    if (Buffer == NULL) {
+      FreePool (NewLine->Buffer);
+      FreePool (NewLine);
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    FreePool (NewLine->Buffer);
+
+    NewLine->Buffer = Buffer;
+
+    for (Index = 0; Index < NewLine->Size; Index++) {
+      NewLine->Buffer[Index] = Line->Buffer[Index + FileColumn - 1];
+    }
+
+    NewLine->Buffer[NewLine->Size]  = CHAR_NULL;
+
+    Line->Buffer[FileColumn - 1]    = CHAR_NULL;
+    Line->Size                      = FileColumn - 1;
+  }
+  //
+  // increase NumLines
+  //
+  FileBuffer.NumLines++;
+
+  //
+  // insert it into the correct position of line list
+  //
+  NewLine->Link.BackLink     = &(Line->Link);
+  NewLine->Link.ForwardLink     = Line->Link.ForwardLink;
+  Line->Link.ForwardLink->BackLink = &(NewLine->Link);
+  Line->Link.ForwardLink        = &(NewLine->Link);
+
+  //
+  // move cursor to the start of next line
+  //
+  Row = FileBuffer.FilePosition.Row + 1;
+  Col = 1;
+
+  FileBufferMovePosition (Row, Col);
+
+  //
+  // set file is modified
+  //
+  if (!FileBuffer.FileModified) {
+    FileBuffer.FileModified = TRUE;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Delete current character from current line.  This is the effect caused 
+  by the 'del' key.
+
+  @retval EFI_SUCCESS
+**/
+EFI_STATUS
+EFIAPI
+FileBufferDoDelete (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  EFI_EDITOR_LINE *Next;
+  LIST_ENTRY  *Link;
+  UINTN           FileColumn;
+
+  Line        = FileBuffer.CurrentLine;
+  FileColumn  = FileBuffer.FilePosition.Column;
+
+  //
+  // the last column
+  //
+  if (FileColumn >= Line->Size + 1) {
+    //
+    // the last line
+    //
+    if (Line->Link.ForwardLink == FileBuffer.ListHead) {
+      return EFI_SUCCESS;
+    }
+    //
+    // since last character,
+    // so will add the next line to this line
+    //
+    Link  = Line->Link.ForwardLink;
+    Next  = CR (Link, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+    LineCat (Line, Next);
+    if (Line->Buffer == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    RemoveEntryList (&Next->Link);
+    FreePool (Next);
+
+    FileBuffer.NumLines--;
+
+    FileBufferNeedRefresh         = TRUE;
+    FileBufferOnlyLineNeedRefresh = FALSE;
+
+  } else {
+    //
+    // just delete current character
+    //
+    LineDeleteAt (Line, FileColumn);
+    FileBufferOnlyLineNeedRefresh = TRUE;
+  }
+
+  if (!FileBuffer.FileModified) {
+    FileBuffer.FileModified = TRUE;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Scroll cursor to right 1 character.
+
+  @retval EFI_SUCCESS     The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferScrollRight (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           FRow;
+  UINTN           FCol;
+
+  Line = FileBuffer.CurrentLine;
+  if (Line->Buffer == NULL) {
+    return EFI_SUCCESS;
+  }
+
+  FRow  = FileBuffer.FilePosition.Row;
+  FCol  = FileBuffer.FilePosition.Column;
+
+  //
+  // if already at end of this line, scroll it to the start of next line
+  //
+  if (FCol > Line->Size) {
+    //
+    // has next line
+    //
+    if (Line->Link.ForwardLink != FileBuffer.ListHead) {
+      FRow++;
+      FCol = 1;
+    } else {
+      return EFI_SUCCESS;
+    }
+  } else {
+    //
+    // if not at end of this line, just move to next column
+    //
+    FCol++;
+  }
+
+  FileBufferMovePosition (FRow, FCol);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Insert a char into line
+
+  
+  @param[in] Line     The line to insert into.
+  @param[in] Char     The char to insert.
+  @param[in] Pos      The position to insert the char at ( start from 0 ).
+  @param[in] StrSize  The current string size ( include CHAR_NULL ),unit is Unicode character.
+
+  @return The new string size ( include CHAR_NULL ) ( unit is Unicode character ).
+**/
+UINTN
+EFIAPI
+LineStrInsert (
+  IN      EFI_EDITOR_LINE  *Line,
+  IN      CHAR16           Char,
+  IN      UINTN            Pos,
+  IN      UINTN            StrSize
+  )
+{
+  UINTN   Index;
+  CHAR16  *TempStringPtr;
+  CHAR16  *Str;
+
+  Index = (StrSize) * 2;
+
+  Str   = Line->Buffer;
+
+  //
+  // do not have free space
+  //
+  if (Line->TotalSize <= Line->Size) {
+    Str = ReallocatePool (Index, Index + 16, Str);
+    if (Str == NULL) {
+      return 0;
+    }
+
+    Line->TotalSize += 8;
+  }
+  //
+  // move the later part of the string one character right
+  //
+  TempStringPtr = Str;
+  for (Index = StrSize; Index > Pos; Index--) {
+    TempStringPtr[Index] = TempStringPtr[Index - 1];
+  }
+  //
+  // insert char into it.
+  //
+  TempStringPtr[Index]      = Char;
+
+  Line->Buffer  = Str;
+  Line->Size++;
+
+  return StrSize + 1;
+}
+
+/**
+  Add a character to the current line.
+
+  @param[in] Char               The Character to input.
+
+  @retval EFI_SUCCESS           The input was succesful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferAddChar (
+  IN  CHAR16  Char
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           FilePos;
+
+  Line = FileBuffer.CurrentLine;
+
+  //
+  // only needs to refresh current line
+  //
+  FileBufferOnlyLineNeedRefresh = TRUE;
+
+  //
+  // when is insert mode, or cursor is at end of this line,
+  // so insert this character
+  // or replace the character.
+  //
+  FilePos = FileBuffer.FilePosition.Column - 1;
+  if (FileBuffer.ModeInsert || FilePos + 1 > Line->Size) {
+    LineStrInsert (Line, Char, FilePos, Line->Size + 1);
+  } else {
+    Line->Buffer[FilePos] = Char;
+  }
+  //
+  // move cursor to right
+  //
+  FileBufferScrollRight ();
+
+  if (!FileBuffer.FileModified) {
+    FileBuffer.FileModified = TRUE;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Handles inputs from characters (ASCII key + Backspace + return)
+
+  @param[in] Char               The input character.
+
+  @retval EFI_SUCCESS           The operation was successful.
+  @retval EFI_LOAD_ERROR        There was an error.
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferDoCharInput (
+  IN CONST CHAR16 Char
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = EFI_SUCCESS;
+
+  switch (Char) {
+  case CHAR_NULL:
+    break;
+
+  case CHAR_BACKSPACE:
+    Status = FileBufferDoBackspace ();
+    break;
+
+  case CHAR_TAB:
+    //
+    // Tabs are ignored
+    //
+    break;
+
+  case CHAR_LINEFEED:
+  case CHAR_CARRIAGE_RETURN:
+    Status = FileBufferDoReturn ();
+    break;
+
+  default:
+    //
+    // DEAL WITH ASCII CHAR, filter out thing like ctrl+f
+    //
+    if (Char > 127 || Char < 32) {
+      Status = StatusBarSetStatusString (L"Unknown Command");
+    } else {
+      Status = FileBufferAddChar (Char);
+    }
+
+    break;
+
+  }
+
+  return Status;
+}
+
+/**
+  Scroll cursor to the next line.
+
+  @retval EFI_SUCCESS     The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferScrollDown (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           FRow;
+  UINTN           FCol;
+
+  Line = FileBuffer.CurrentLine;
+  if (Line->Buffer == NULL) {
+    return EFI_SUCCESS;
+  }
+
+  FRow  = FileBuffer.FilePosition.Row;
+  FCol  = FileBuffer.FilePosition.Column;
+
+  //
+  // has next line
+  //
+  if (Line->Link.ForwardLink != FileBuffer.ListHead) {
+    FRow++;
+    Line = CR (Line->Link.ForwardLink, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+
+    //
+    // if the next line is not that long, so move to end of next line
+    //
+    if (FCol > Line->Size) {
+      FCol = Line->Size + 1;
+    }
+
+  } else {
+    return EFI_SUCCESS;
+  }
+
+  FileBufferMovePosition (FRow, FCol);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Scroll the cursor to previous line.
+
+  @retval EFI_SUCCESS     The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferScrollUp (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           FRow;
+  UINTN           FCol;
+
+  Line  = FileBuffer.CurrentLine;
+
+  FRow  = FileBuffer.FilePosition.Row;
+  FCol  = FileBuffer.FilePosition.Column;
+
+  //
+  // has previous line
+  //
+  if (Line->Link.BackLink != FileBuffer.ListHead) {
+    FRow--;
+    Line = CR (Line->Link.BackLink, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+
+    //
+    // if previous line is not that long, so move to the end of previous line
+    //
+    if (FCol > Line->Size) {
+      FCol = Line->Size + 1;
+    }
+
+  } else {
+    return EFI_SUCCESS;
+  }
+
+  FileBufferMovePosition (FRow, FCol);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Scroll cursor to next page.
+
+  @retval EFI_SUCCESS     The operation wa successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferPageDown (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           FRow;
+  UINTN           FCol;
+  UINTN           Gap;
+
+  Line  = FileBuffer.CurrentLine;
+
+  FRow  = FileBuffer.FilePosition.Row;
+  FCol  = FileBuffer.FilePosition.Column;
+
+  //
+  // has next page
+  //
+  if (FileBuffer.NumLines >= FRow + (MainEditor.ScreenSize.Row - 5)) {
+    Gap = (MainEditor.ScreenSize.Row - 5);
+  } else {
+    //
+    // MOVE CURSOR TO LAST LINE
+    //
+    Gap = FileBuffer.NumLines - FRow;
+  }
+  //
+  // get correct line
+  //
+  Line = MoveLine (Gap);
+
+  //
+  // if that line, is not that long, so move to the end of that line
+  //
+  if (FCol > Line->Size) {
+    FCol = Line->Size + 1;
+  }
+
+  FRow += Gap;
+
+  FileBufferMovePosition (FRow, FCol);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Scroll cursor to previous screen.
+
+  @retval EFI_SUCCESS     The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferPageUp (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           FRow;
+  UINTN           FCol;
+  UINTN           Gap;
+  INTN            Retreat;
+
+  Line  = FileBuffer.CurrentLine;
+
+  FRow  = FileBuffer.FilePosition.Row;
+  FCol  = FileBuffer.FilePosition.Column;
+
+  //
+  // has previous page
+  //
+  if (FRow > (MainEditor.ScreenSize.Row - 5)) {
+    Gap = (MainEditor.ScreenSize.Row - 5);
+  } else {
+    //
+    // the first line of file will displayed on the first line of screen
+    //
+    Gap = FRow - 1;
+  }
+
+  Retreat = Gap;
+  Retreat = -Retreat;
+
+  //
+  // get correct line
+  //
+  Line = MoveLine (Retreat);
+
+  //
+  // if that line is not that long, so move to the end of that line
+  //
+  if (FCol > Line->Size) {
+    FCol = Line->Size + 1;
+  }
+
+  FRow -= Gap;
+
+  FileBufferMovePosition (FRow, FCol);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Scroll cursor to end of the current line.
+
+  @retval EFI_SUCCESS       The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferEnd (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           FRow;
+  UINTN           FCol;
+
+  Line  = FileBuffer.CurrentLine;
+
+  FRow  = FileBuffer.FilePosition.Row;
+
+  //
+  // goto the last column of the line
+  //
+  FCol = Line->Size + 1;
+
+  FileBufferMovePosition (FRow, FCol);
+
+  return EFI_SUCCESS;
+}
+
+/** 
+  Dispatch input to different handler
+  @param[in] Key                The input key.  One of:
+                                    ASCII KEY
+                                    Backspace/Delete
+                                    Return
+                                    Direction key: up/down/left/right/pgup/pgdn
+                                    Home/End
+                                    INS
+
+  @retval EFI_SUCCESS           The dispatch was done successfully.
+  @retval EFI_LOAD_ERROR        The dispatch was not successful.
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferHandleInput (
+  IN CONST EFI_INPUT_KEY *Key
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = EFI_SUCCESS;
+
+  switch (Key->ScanCode) {
+  //
+  // ordinary key input
+  //
+  case SCAN_NULL:
+    if (!FileBuffer.ReadOnly) {
+      Status = FileBufferDoCharInput (Key->UnicodeChar);
+    } else {
+      Status = StatusBarSetStatusString (L"Read Only File Can Not Be Modified");
+    }
+
+    break;
+
+  //
+  // up arrow
+  //
+  case SCAN_UP:
+    Status = FileBufferScrollUp ();
+    break;
+
+  //
+  // down arrow
+  //
+  case SCAN_DOWN:
+    Status = FileBufferScrollDown ();
+    break;
+
+  //
+  // right arrow
+  //
+  case SCAN_RIGHT:
+    Status = FileBufferScrollRight ();
+    break;
+
+  //
+  // left arrow
+  //
+  case SCAN_LEFT:
+    Status = FileBufferScrollLeft ();
+    break;
+
+  //
+  // page up
+  //
+  case SCAN_PAGE_UP:
+    Status = FileBufferPageUp ();
+    break;
+
+  //
+  // page down
+  //
+  case SCAN_PAGE_DOWN:
+    Status = FileBufferPageDown ();
+    break;
+
+  //
+  // delete
+  //
+  case SCAN_DELETE:
+    if (!FileBuffer.ReadOnly) {
+      Status = FileBufferDoDelete ();
+    } else {
+      Status = StatusBarSetStatusString (L"Read Only File Can Not Be Modified");
+    }
+
+    break;
+
+  //
+  // home
+  //
+  case SCAN_HOME:
+    FileBufferMovePosition (FileBuffer.FilePosition.Row, 1);
+    Status = EFI_SUCCESS;
+    break;
+
+  //
+  // end
+  //
+  case SCAN_END:
+    Status = FileBufferEnd ();
+    break;
+
+  //
+  // insert
+  //
+  case SCAN_INSERT:
+    FileBuffer.ModeInsert = (BOOLEAN)!FileBuffer.ModeInsert;
+    Status = EFI_SUCCESS;
+    break;
+
+  default:
+    Status = StatusBarSetStatusString (L"Unknown Command");
+    break;
+  }
+
+  return Status;
+}
+
+/**
+  Check user specified FileRow is above current screen.
+
+  @param[in] FileRow    The row of file position ( start from 1 ).
+
+  @retval TRUE    It is above the current screen.
+  @retval FALSE   It is not above the current screen.
+**/
+BOOLEAN
+EFIAPI
+AboveCurrentScreen (
+  IN UINTN FileRow
+  )
+{
+  //
+  // if is to the above of the screen
+  //
+  if (FileRow < FileBuffer.LowVisibleRange.Row) {
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+/**
+  Check user specified FileRow is under current screen.
+
+  @param[in] FileRow    The row of file position ( start from 1 ).
+
+  @retval TRUE      It is under the current screen.
+  @retval FALSE     It is not under the current screen.
+**/
+BOOLEAN
+EFIAPI
+UnderCurrentScreen (
+  IN UINTN FileRow
+  )
+{
+  //
+  // if is to the under of the screen
+  //
+  if (FileRow > FileBuffer.LowVisibleRange.Row + (MainEditor.ScreenSize.Row - 5) - 1) {
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+/**
+  Check user specified FileCol is left to current screen.
+
+  @param[in] FileCol    The column of file position ( start from 1 ).
+
+  @retval TRUE    It is to the left.
+  @retval FALSE   It is not to the left.
+**/
+BOOLEAN
+EFIAPI
+LeftCurrentScreen (
+  IN UINTN FileCol
+  )
+{
+  //
+  // if is to the left of the screen
+  //
+  if (FileCol < FileBuffer.LowVisibleRange.Column) {
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+/**
+  Check user specified FileCol is right to current screen.
+
+  @param[in] FileCol    The column of file position ( start from 1 ).
+
+  @retval TRUE    It is to the right.
+  @retval FALSE   It is not to the right.
+**/
+BOOLEAN
+EFIAPI
+RightCurrentScreen (
+  IN UINTN FileCol
+  )
+{
+  //
+  // if is to the right of the screen
+  //
+  if (FileCol > FileBuffer.LowVisibleRange.Column + MainEditor.ScreenSize.Column - 1) {
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+/**
+  Advance/Retreat lines and set CurrentLine in FileBuffer to it
+  
+  @param[in] Count The line number to advance/retreat
+                     >0 : advance
+                     <0: retreat
+
+  @retval NULL An error occured.
+  @return The line after advance/retreat.
+**/
+EFI_EDITOR_LINE *
+EFIAPI
+MoveCurrentLine (
+  IN  INTN Count
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  UINTN           AbsCount;
+
+  if (Count <= 0) {
+    AbsCount  = -Count;
+    Line      = InternalEditorMiscLineRetreat (AbsCount,MainEditor.FileBuffer->CurrentLine,MainEditor.FileBuffer->ListHead);
+  } else {
+    Line = InternalEditorMiscLineAdvance (Count,MainEditor.FileBuffer->CurrentLine,MainEditor.FileBuffer->ListHead);
+  }
+
+  if (Line == NULL) {
+    return NULL;
+  }
+
+  MainEditor.FileBuffer->CurrentLine = Line;
+
+  return Line;
+}
+
+/**
+  According to cursor's file position, adjust screen display
+
+  @param[in] NewFilePosRow    The row of file position ( start from 1 ).
+  @param[in] NewFilePosCol    The column of file position ( start from 1 ).
+**/
+VOID
+EFIAPI
+FileBufferMovePosition (
+  IN CONST UINTN NewFilePosRow,
+  IN CONST UINTN NewFilePosCol
+  )
+{
+  INTN    RowGap;
+  INTN    ColGap;
+  UINTN   Abs;
+  BOOLEAN Above;
+  BOOLEAN Under;
+  BOOLEAN Right;
+  BOOLEAN Left;
+
+  //
+  // CALCULATE gap between current file position and new file position
+  //
+  RowGap  = NewFilePosRow - FileBuffer.FilePosition.Row;
+  ColGap  = NewFilePosCol - FileBuffer.FilePosition.Column;
+
+  Under   = UnderCurrentScreen (NewFilePosRow);
+  Above   = AboveCurrentScreen (NewFilePosRow);
+  //
+  // if is below current screen
+  //
+  if (Under) {
+    //
+    // display row will be unchanged
+    //
+    FileBuffer.FilePosition.Row = NewFilePosRow;
+  } else {
+    if (Above) {
+      //
+      // has enough above line, so display row unchanged
+      // not has enough above lines, so the first line is at the
+      // first display line
+      //
+      if (NewFilePosRow < (FileBuffer.DisplayPosition.Row - 1)) {
+        FileBuffer.DisplayPosition.Row = NewFilePosRow + 1;
+      }
+
+      FileBuffer.FilePosition.Row = NewFilePosRow;
+    } else {
+      //
+      // in current screen
+      //
+      FileBuffer.FilePosition.Row = NewFilePosRow;
+      if (RowGap < 0) {
+        Abs = -RowGap;
+        FileBuffer.DisplayPosition.Row -= Abs;
+      } else {
+        FileBuffer.DisplayPosition.Row += RowGap;
+      }
+    }
+  }
+
+  FileBuffer.LowVisibleRange.Row  = FileBuffer.FilePosition.Row - (FileBuffer.DisplayPosition.Row - 2);
+
+  Right = RightCurrentScreen (NewFilePosCol);
+  Left = LeftCurrentScreen (NewFilePosCol);
+
+  //
+  // if right to current screen
+  //
+  if (Right) {
+    //
+    // display column will be changed to end
+    //
+    FileBuffer.DisplayPosition.Column = MainEditor.ScreenSize.Column;
+    FileBuffer.FilePosition.Column    = NewFilePosCol;
+  } else {
+    if (Left) {
+      //
+      // has enough left characters , so display row unchanged
+      // not has enough left characters,
+      // so the first character is at the first display column
+      //
+      if (NewFilePosCol < (FileBuffer.DisplayPosition.Column)) {
+        FileBuffer.DisplayPosition.Column = NewFilePosCol;
+      }
+
+      FileBuffer.FilePosition.Column = NewFilePosCol;
+    } else {
+      //
+      // in current screen
+      //
+      FileBuffer.FilePosition.Column = NewFilePosCol;
+      if (ColGap < 0) {
+        Abs = -ColGap;
+        FileBuffer.DisplayPosition.Column -= Abs;
+      } else {
+        FileBuffer.DisplayPosition.Column += ColGap;
+      }
+    }
+  }
+
+  FileBuffer.LowVisibleRange.Column = FileBuffer.FilePosition.Column - (FileBuffer.DisplayPosition.Column - 1);
+
+  //
+  // let CurrentLine point to correct line;
+  //
+  FileBuffer.CurrentLine = MoveCurrentLine (RowGap);
+
+}
+
+/**
+  Cut current line out and return a pointer to it.
+
+  @param[out] CutLine    Upon a successful return pointer to the pointer to 
+                        the allocated cut line.
+
+  @retval EFI_SUCCESS             The cut was successful.
+  @retval EFI_NOT_FOUND           There was no selection to cut.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferCutLine (
+  OUT EFI_EDITOR_LINE **CutLine
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  EFI_EDITOR_LINE *NewLine;
+  UINTN           Row;
+  UINTN           Col;
+
+  if (FileBuffer.ReadOnly) {
+    StatusBarSetStatusString (L"Read Only File Can Not Be Modified");
+    return EFI_SUCCESS;
+  }
+
+  Line = FileBuffer.CurrentLine;
+
+  //
+  // if is the last dummy line, SO CAN not cut
+  //
+  if (StrCmp (Line->Buffer, L"\0") == 0 && Line->Link.ForwardLink == FileBuffer.ListHead
+  //
+  // last line
+  //
+  ) {
+    //
+    // LAST LINE AND NOTHING ON THIS LINE, SO CUT NOTHING
+    //
+    StatusBarSetStatusString (L"Nothing to Cut");
+    return EFI_NOT_FOUND;
+  }
+  //
+  // if is the last line, so create a dummy line
+  //
+  if (Line->Link.ForwardLink == FileBuffer.ListHead) {
+    //
+    // last line
+    // create a new line
+    //
+    NewLine = FileBufferCreateLine ();
+    if (NewLine == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+  }
+
+  FileBuffer.NumLines--;
+  Row = FileBuffer.FilePosition.Row;
+  Col = 1;
+  //
+  // move home
+  //
+  FileBuffer.CurrentLine = CR (
+                            FileBuffer.CurrentLine->Link.ForwardLink,
+                            EFI_EDITOR_LINE,
+                            Link,
+                            LINE_LIST_SIGNATURE
+                            );
+
+  RemoveEntryList (&Line->Link);
+
+  FileBuffer.Lines = CR (FileBuffer.ListHead->ForwardLink, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+
+  FileBufferMovePosition (Row, Col);
+
+  FileBuffer.FileModified       = TRUE;
+  FileBufferNeedRefresh         = TRUE;
+  FileBufferOnlyLineNeedRefresh = FALSE;
+
+  *CutLine                      = Line;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Paste a line into line list.
+
+  @retval EFI_SUCCESS             The paste was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferPasteLine (
+  VOID
+  )
+{
+  EFI_EDITOR_LINE *Line;
+  EFI_EDITOR_LINE *NewLine;
+  UINTN           Row;
+  UINTN           Col;
+
+  //
+  // if nothing is on clip board
+  // then do nothing
+  //
+  if (MainEditor.CutLine == NULL) {
+    return EFI_SUCCESS;
+  }
+  //
+  // read only file can not be pasted on
+  //
+  if (FileBuffer.ReadOnly) {
+    StatusBarSetStatusString (L"Read Only File Can Not Be Modified");
+    return EFI_SUCCESS;
+  }
+
+  NewLine = LineDup (MainEditor.CutLine);
+  if (NewLine == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  //
+  // insert it above current line
+  //
+  Line                    = FileBuffer.CurrentLine;
+  NewLine->Link.BackLink     = Line->Link.BackLink;
+  NewLine->Link.ForwardLink     = &Line->Link;
+
+  Line->Link.BackLink->ForwardLink = &NewLine->Link;
+  Line->Link.BackLink        = &NewLine->Link;
+
+  FileBuffer.NumLines++;
+  FileBuffer.CurrentLine  = NewLine;
+
+  FileBuffer.Lines        = CR (FileBuffer.ListHead->ForwardLink, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+
+  Col                     = 1;
+  //
+  // move home
+  //
+  Row = FileBuffer.FilePosition.Row;
+
+  FileBufferMovePosition (Row, Col);
+
+  //
+  // after paste, set some value so that refresh knows to do something
+  //
+  FileBuffer.FileModified       = TRUE;
+  FileBufferNeedRefresh         = TRUE;
+  FileBufferOnlyLineNeedRefresh = FALSE;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Search string from current position on in file
+
+  @param[in] Str    The search string.
+  @param[in] Offset The offset from current position.
+
+  @retval EFI_SUCCESS       The operation was successful.
+  @retval EFI_NOT_FOUND     The string Str was not found.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferSearch (
+  IN CONST CHAR16  *Str,
+  IN CONST UINTN Offset
+  )
+{
+  CHAR16          *Current;
+  UINTN           Position;
+  UINTN           Row;
+  UINTN           Column;
+  EFI_EDITOR_LINE *Line;
+  CHAR16          *CharPos;
+  LIST_ENTRY      *Link;
+  BOOLEAN         Found;
+
+  Column = 0;
+
+  //
+  // search if in current line
+  //
+  Current = FileBuffer.CurrentLine->Buffer + FileBuffer.FilePosition.Column - 1 + Offset;
+
+  if (Current >= (FileBuffer.CurrentLine->Buffer + FileBuffer.CurrentLine->Size)) {
+    //
+    // the end
+    //
+    Current = FileBuffer.CurrentLine->Buffer + FileBuffer.CurrentLine->Size;
+  }
+
+  CharPos  =  StrStr (Current, Str);
+  if (CharPos != NULL) {
+    Position = CharPos - Current;
+  } else {
+    Position = 0;
+  }
+
+  //
+  // found
+  //
+  if (Position != 0) {
+    Column  = (Position - 1) + FileBuffer.FilePosition.Column + Offset;
+    Row     = FileBuffer.FilePosition.Row;
+    Found   = TRUE;
+  } else {
+    //
+    // not found so find through next lines
+    //
+    Link  = FileBuffer.CurrentLine->Link.ForwardLink;
+
+    Row   = FileBuffer.FilePosition.Row + 1;
+    while (Link != FileBuffer.ListHead) {
+      Line      = CR (Link, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+//      Position  = StrStr (Line->Buffer, Str);
+      CharPos  =  StrStr (Line->Buffer, Str);
+      if (CharPos != NULL) {
+        Position = CharPos - Line->Buffer;
+      }
+      if (Position != 0) {
+        //
+        // found
+        //
+        Column = Position;
+        break;
+      }
+
+      Row++;
+      Link = Link->ForwardLink;
+    }
+
+    if (Link == FileBuffer.ListHead) {
+      Found = FALSE;
+    } else {
+      Found = TRUE;
+    }
+  }
+
+  if (!Found) {
+    return EFI_NOT_FOUND;
+  }
+
+  FileBufferMovePosition (Row, Column);
+
+  //
+  // call refresh to fresh edit area,
+  // because the outer may loop to find multiply occurrence of this string
+  //
+  FileBufferRefresh ();
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Replace SearchLen characters from current position on with Replace.
+
+  This will modify the current buffer at the current position.
+
+  @param[in] Replace    The string to replace.
+  @param[in] SearchLen  Search string's length.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferReplace (
+  IN CONST CHAR16   *Replace,
+  IN CONST UINTN    SearchLen
+  )
+{
+  UINTN   ReplaceLen;
+  UINTN   Index;
+  CHAR16  *Buffer;
+  UINTN   NewSize;
+  UINTN   OldSize;
+  UINTN   Gap;
+
+  ReplaceLen  = StrLen (Replace);
+
+  OldSize     = FileBuffer.CurrentLine->Size + 1;
+  //
+  // include CHAR_NULL
+  //
+  NewSize = OldSize + (ReplaceLen - SearchLen);
+
+  if (ReplaceLen > SearchLen) {
+    //
+    // do not have the enough space
+    //
+    if (FileBuffer.CurrentLine->TotalSize + 1 <= NewSize) {
+      FileBuffer.CurrentLine->Buffer = ReallocatePool (
+                                        2 * OldSize,
+                                        2 * NewSize,
+                                        FileBuffer.CurrentLine->Buffer
+                                        );
+      FileBuffer.CurrentLine->TotalSize = NewSize - 1;
+    }
+
+    if (FileBuffer.CurrentLine->Buffer == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+    //
+    // the end CHAR_NULL character;
+    //
+    Buffer  = FileBuffer.CurrentLine->Buffer + (NewSize - 1);
+    Gap     = ReplaceLen - SearchLen;
+
+    //
+    // keep the latter part
+    //
+    for (Index = 0; Index < (FileBuffer.CurrentLine->Size - FileBuffer.FilePosition.Column - SearchLen + 2); Index++) {
+      *Buffer = *(Buffer - Gap);
+      Buffer--;
+    }
+    //
+    // set replace into it
+    //
+    Buffer = FileBuffer.CurrentLine->Buffer + FileBuffer.FilePosition.Column;
+    for (Index = 0; Index < ReplaceLen; Index++) {
+      Buffer[Index] = Replace[Index];
+    }
+  }
+
+  if (ReplaceLen < SearchLen) {
+    Buffer = FileBuffer.CurrentLine->Buffer + FileBuffer.FilePosition.Column;
+
+    for (Index = 0; Index < ReplaceLen; Index++) {
+      Buffer[Index] = Replace[Index];
+    }
+
+    Buffer += ReplaceLen;
+    Gap = SearchLen - ReplaceLen;
+
+    //
+    // set replace into it
+    //
+    for (Index = 0; Index < (FileBuffer.CurrentLine->Size - FileBuffer.FilePosition.Column - ReplaceLen + 2); Index++) {
+      *Buffer = *(Buffer + Gap);
+      Buffer++;
+    }
+  }
+
+  if (ReplaceLen == SearchLen) {
+    Buffer = FileBuffer.CurrentLine->Buffer + FileBuffer.FilePosition.Column;
+    for (Index = 0; Index < ReplaceLen; Index++) {
+      Buffer[Index] = Replace[Index];
+    }
+  }
+
+  FileBuffer.CurrentLine->Size += (ReplaceLen - SearchLen);
+
+  FileBufferOnlyLineNeedRefresh = TRUE;
+
+  FileBuffer.FileModified       = TRUE;
+
+  MainTitleBarRefresh (MainEditor.FileBuffer->FileName, MainEditor.FileBuffer->FileType, MainEditor.FileBuffer->ReadOnly, MainEditor.FileBuffer->FileModified, MainEditor.ScreenSize.Column, MainEditor.ScreenSize.Row);
+  FileBufferRestorePosition ();
+  FileBufferRefresh ();
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Move the mouse cursor position.
+
+  @param[in] TextX      The new x-coordinate.
+  @param[in] TextY      The new y-coordinate.
+**/
+VOID
+EFIAPI
+FileBufferAdjustMousePosition (
+  IN CONST INT32 TextX,
+  IN CONST INT32 TextY
+  )
+{
+  UINTN CoordinateX;
+  UINTN CoordinateY;
+  UINTN AbsX;
+  UINTN AbsY;
+
+  //
+  // TextX and TextY is mouse movement data returned by mouse driver
+  // This function will change it to MousePosition
+  //
+  //
+  // get absolute value
+  //
+
+  AbsX = ABS(TextX);
+  AbsY = ABS(TextY);
+
+  CoordinateX = FileBuffer.MousePosition.Column;
+  CoordinateY = FileBuffer.MousePosition.Row;
+
+  if (TextX >= 0) {
+    CoordinateX += TextX;
+  } else {
+    if (CoordinateX >= AbsX) {
+      CoordinateX -= AbsX;
+    } else {
+      CoordinateX = 0;
+    }
+  }
+
+  if (TextY >= 0) {
+    CoordinateY += TextY;
+  } else {
+    if (CoordinateY >= AbsY) {
+      CoordinateY -= AbsY;
+    } else {
+      CoordinateY = 0;
+    }
+  }
+  //
+  // check whether new mouse column position is beyond screen
+  // if not, adjust it
+  //
+  if (CoordinateX >= 1 && CoordinateX <= MainEditor.ScreenSize.Column) {
+    FileBuffer.MousePosition.Column = CoordinateX;
+  } else if (CoordinateX < 1) {
+    FileBuffer.MousePosition.Column = 1;
+  } else if (CoordinateX > MainEditor.ScreenSize.Column) {
+    FileBuffer.MousePosition.Column = MainEditor.ScreenSize.Column;
+  }
+  //
+  // check whether new mouse row position is beyond screen
+  // if not, adjust it
+  //
+  if (CoordinateY >= 2 && CoordinateY <= (MainEditor.ScreenSize.Row - 4)) {
+    FileBuffer.MousePosition.Row = CoordinateY;
+  } else if (CoordinateY < 2) {
+    FileBuffer.MousePosition.Row = 2;
+  } else if (CoordinateY > (MainEditor.ScreenSize.Row - 4)) {
+    FileBuffer.MousePosition.Row = (MainEditor.ScreenSize.Row - 4);
+  }
+
+}
+
+/**
+  Search and replace operation.
+
+  @param[in] SearchStr    The string to search for.
+  @param[in] ReplaceStr   The string to replace with.
+  @param[in] Offset       The column to start at.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferReplaceAll (
+  IN CHAR16 *SearchStr,
+  IN CHAR16 *ReplaceStr,
+  IN UINTN  Offset
+  )
+{
+  CHAR16          *Buffer;
+  UINTN           Position;
+  UINTN           Column;
+  UINTN           ReplaceLen;
+  UINTN           SearchLen;
+  UINTN           Index;
+  UINTN           NewSize;
+  UINTN           OldSize;
+  UINTN           Gap;
+  EFI_EDITOR_LINE *Line;
+  LIST_ENTRY      *Link;
+  CHAR16          *CharPos;
+
+  SearchLen   = StrLen (SearchStr);
+  ReplaceLen  = StrLen (ReplaceStr);
+
+  Column      = FileBuffer.FilePosition.Column + Offset - 1;
+
+  if (Column > FileBuffer.CurrentLine->Size) {
+    Column = FileBuffer.CurrentLine->Size;
+  }
+
+  Link = &(FileBuffer.CurrentLine->Link);
+
+  while (Link != FileBuffer.ListHead) {
+    Line      = CR (Link, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+    CharPos  =  StrStr (Line->Buffer + Column, SearchStr);
+    if (CharPos != NULL) {
+      Position = CharPos - Line->Buffer;// + Column;
+      //
+      // found
+      //
+      if (ReplaceLen > SearchLen) {
+        OldSize = Line->Size + 1;
+        //
+        // include CHAR_NULL
+        //
+        NewSize = OldSize + (ReplaceLen - SearchLen);
+
+        //
+        // do not have the enough space
+        //
+        if (Line->TotalSize + 1 <= NewSize) {
+          Line->Buffer = ReallocatePool (
+                          2 * OldSize,
+                          2 * NewSize,
+                          Line->Buffer
+                          );
+          Line->TotalSize = NewSize - 1;
+        }
+
+        if (Line->Buffer == NULL) {
+          return EFI_OUT_OF_RESOURCES;
+        }
+        //
+        // the end CHAR_NULL character;
+        //
+        Buffer  = Line->Buffer + (NewSize - 1);
+        Gap     = ReplaceLen - SearchLen;
+
+        //
+        // keep the latter part
+        //
+        for (Index = 0; Index < (Line->Size - Position - SearchLen + 1); Index++) {
+          *Buffer = *(Buffer - Gap);
+          Buffer--;
+        }
+
+      } else if (ReplaceLen < SearchLen){
+        Buffer  = Line->Buffer + Position + ReplaceLen;
+        Gap     = SearchLen - ReplaceLen;
+
+        for (Index = 0; Index < (Line->Size - Position - ReplaceLen + 1); Index++) {
+          *Buffer = *(Buffer + Gap);
+          Buffer++;
+        }
+      } else {
+        ASSERT(ReplaceLen == SearchLen);
+      }
+      //
+      // set replace into it
+      //
+      Buffer = Line->Buffer + Position;
+      for (Index = 0; Index < ReplaceLen; Index++) {
+        Buffer[Index] = ReplaceStr[Index];
+      }
+
+      Line->Size += (ReplaceLen - SearchLen);
+      Column += ReplaceLen;
+    } else {
+      //
+      // not found
+      //
+      Column  = 0;
+      Link    = Link->ForwardLink;
+    }
+  }
+  //
+  // call refresh to fresh edit area
+  //
+  FileBuffer.FileModified = TRUE;
+  FileBufferNeedRefresh   = TRUE;
+  FileBufferRefresh ();
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Set the modified state to TRUE.
+**/
+VOID
+EFIAPI
+FileBufferSetModified (
+  VOID
+  )
+{
+  FileBuffer.FileModified = TRUE;
+}
+
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.h
new file mode 100644
index 0000000000..9d4a08d7a3
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.h
@@ -0,0 +1,263 @@
+/** @file
+  Declares filebuffer interface functions.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_FILE_BUFFER_H_
+#define _LIB_FILE_BUFFER_H_
+
+#include "TextEditorTypes.h"
+
+/**
+  Initialization function for FileBuffer.
+
+  @param EFI_SUCCESS            The initialization was successful.
+  @param EFI_LOAD_ERROR         A default name could not be created.
+  @param EFI_OUT_OF_RESOURCES   A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferInit (
+  VOID
+  );
+
+/**
+  Cleanup function for FileBuffer.
+
+  @retval EFI_SUCCESS   The cleanup was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferCleanup (
+  VOID
+  );
+
+/**
+  Refresh the screen with whats in the buffer.
+
+  @retval EFI_SUCCESS     The refresh was successful.
+  @retval EFI_LOAD_ERROR  There was an error finding what to write.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferRefresh (
+  VOID
+  );
+
+/** 
+  Dispatch input to different handler
+  @param[in] Key                The input key.  One of:
+                                    ASCII KEY
+                                    Backspace/Delete
+                                    Return
+                                    Direction key: up/down/left/right/pgup/pgdn
+                                    Home/End
+                                    INS
+
+  @retval EFI_SUCCESS           The dispatch was done successfully.
+  @retval EFI_LOAD_ERROR        The dispatch was not successful.
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferHandleInput (
+  IN CONST EFI_INPUT_KEY * Key
+  );
+
+/**
+  Backup function for FileBuffer.  Only backup the following items:
+      Mouse/Cursor position
+      File Name, Type, ReadOnly, Modified
+      Insert Mode
+
+  This is for making the file buffer refresh as few as possible.
+
+  @retval EFI_SUCCESS           The backup operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferBackup (
+  VOID
+  );
+
+/**
+  Set the cursor position according to FileBuffer.DisplayPosition.
+
+  @retval EFI_SUCCESS           The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferRestorePosition (
+  VOID
+  );
+
+/**
+  Set FileName field in FileBuffer.
+
+  @param Str                    The file name to set.
+  
+  @retval EFI_SUCCESS           The filename was successfully set.
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+  @retval EFI_INVALID_PARAMETER Str is not a valid filename.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferSetFileName (
+  IN CONST CHAR16 *Str
+  );
+
+/**
+  Read a file from disk into the FileBuffer.
+  
+  @param[in] FileName           The filename to read.
+  @param[in] Recover            TRUE if is for recover mode, no information printouts.
+  
+  @retval EFI_SUCCESS            The load was successful.
+  @retval EFI_LOAD_ERROR         The load failed.
+  @retval EFI_OUT_OF_RESOURCES   A memory allocation failed.
+  @retval EFI_INVALID_PARAMETER  FileName is a directory.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferRead (
+  IN CONST CHAR16  *FileName,
+  IN CONST BOOLEAN Recover
+  );
+
+/**
+  Save lines in FileBuffer to disk
+
+  @param[in] FileName           The file name for writing.
+
+  @retval EFI_SUCCESS           Data was written.
+  @retval EFI_LOAD_ERROR        
+  @retval EFI_OUT_OF_RESOURCES  There were not enough resources to write the file.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferSave (
+  CONST CHAR16 *FileName
+  );
+
+/**
+  According to cursor's file position, adjust screen display
+
+  @param[in] NewFilePosRow    The row of file position ( start from 1 ).
+  @param[in] NewFilePosCol    The column of file position ( start from 1 ).
+**/
+VOID
+EFIAPI
+FileBufferMovePosition (
+  IN CONST UINTN NewFilePosRow,
+  IN CONST UINTN NewFilePosCol
+  );
+
+/**
+  Cut current line out and return a pointer to it.
+
+  @param[out] CutLine    Upon a successful return pointer to the pointer to 
+                        the allocated cut line.
+
+  @retval EFI_SUCCESS             The cut was successful.
+  @retval EFI_NOT_FOUND           There was no selection to cut.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferCutLine (
+  OUT EFI_EDITOR_LINE **CutLine
+  );
+
+/**
+  Paste a line into line list.
+
+  @retval EFI_SUCCESS             The paste was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferPasteLine (
+  VOID
+  );
+
+/**
+  Search string from current position on in file
+
+  @param[in] Str    The search string.
+  @param[in] Offset The offset from current position.
+
+  @retval EFI_SUCCESS       The operation was successful.
+  @retval EFI_NOT_FOUND     The string Str was not found.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferSearch (
+  IN CONST CHAR16  *Str,
+  IN CONST UINTN Offset
+  );
+
+/**
+  Replace SearchLen characters from current position on with Replace.
+
+  This will modify the current buffer at the current position.
+
+  @param[in] Replace    The string to replace.
+  @param[in] SearchLen  Search string's length.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferReplace (
+  IN CONST CHAR16   *Replace,
+  IN CONST UINTN    SearchLen
+  );
+
+/**
+  Search and replace operation.
+
+  @param[in] SearchStr    The string to search for.
+  @param[in] ReplaceStr   The string to replace with.
+  @param[in] Offset       The column to start at.
+**/
+EFI_STATUS
+EFIAPI
+FileBufferReplaceAll (
+  IN CHAR16 *SearchStr,
+  IN CHAR16 *ReplaceStr,
+  IN UINTN  Offset
+  );
+
+/**
+  Move the mouse cursor position.
+
+  @param[in] TextX      The new x-coordinate.
+  @param[in] TextY      The new y-coordinate.
+**/
+VOID
+EFIAPI
+FileBufferAdjustMousePosition (
+  IN CONST INT32 TextX,
+  IN CONST INT32 TextY
+  );
+
+/**
+  Set the modified state to TRUE.
+**/
+VOID
+EFIAPI
+FileBufferSetModified (
+  VOID
+  );
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/MainTextEditor.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/MainTextEditor.c
new file mode 100644
index 0000000000..7749bdc547
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/MainTextEditor.c
@@ -0,0 +1,1830 @@
+/** @file
+  Implements editor interface functions.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "TextEditor.h"
+#include "EditStatusBar.h"
+#include "EditInputBar.h"
+
+/**
+  Load a file from disk to editor
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_LOAD_ERROR          A load error occured.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandOpenFile (
+  VOID
+  );
+
+/**
+  Switch a file from ASCII to UNICODE or vise-versa.
+
+  @retval EFI_SUCCESS           The switch was ok or a warning was presented.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandSwitchFileType (
+  VOID
+  );
+
+/**
+  move cursor to specified lines
+
+  @retval EFI_SUCCESS             The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandGotoLine (
+  VOID
+  );
+
+/**
+  Save current file to disk, you can save to current file name or
+  save to another file name.
+  
+  @retval EFI_SUCCESS           The file was saved correctly.
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A file access error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandSaveFile (
+  VOID
+  );
+
+/**
+  exit editor
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandExit (
+  VOID
+  );
+
+/**
+  search string in file buffer
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandSearch (
+  VOID
+  );
+
+/*
+  search string in file buffer, and replace it with another str
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandSearchReplace (
+  VOID
+  );
+
+/**
+  cut current line to clipboard
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandCutLine (
+  VOID
+  );
+
+/**
+  paste line to file buffer.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandPasteLine (
+  VOID
+  );
+
+EDITOR_MENU_ITEM  MainMenuItems[] = {
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_GO_TO_LINE),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F1),
+    MainCommandGotoLine
+  },
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_SAVE_FILE),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F2),
+    MainCommandSaveFile
+  },
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_EXIT),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F3),
+    MainCommandExit
+  },
+
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_SEARCH),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F4),
+    MainCommandSearch
+  },
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_SEARCH_REPLACE),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F5),
+    MainCommandSearchReplace
+  },
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_CUT_LINE),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F6),
+    MainCommandCutLine
+  },
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_PASTE_LINE),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F7),
+    MainCommandPasteLine
+  },
+
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_OPEN_FILE),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F8),
+    MainCommandOpenFile
+  },
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_FILE_TYPE),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F9),
+    MainCommandSwitchFileType
+  },
+
+  {
+    0,
+    0,
+    NULL
+  }
+};
+
+
+/**
+  Load a file from disk to editor
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_LOAD_ERROR          A load error occured.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandOpenFile (
+  VOID
+  )
+{
+  BOOLEAN     Done;
+  EFI_STATUS  Status;
+
+  //
+  //  This command will open a file from current working directory.
+  //   Read-only file can also be opened. But it can not be modified.
+  // Below is the scenario of Open File command:
+  // 1.IF currently opened file has not been modIFied, directly go to step .
+  //   IF currently opened file has been modified,
+  //     an Input Bar will be prompted as :
+  //       "File Modified. Save ( Yes/No/Cancel) ?"
+  //           IF user press 'y' or 'Y', currently opened file will be saved.
+  //           IF user press 'n' or 'N', currently opened file will
+  //              not be saved.
+  //           IF user press 'c' or 'C' or ESC, Open File command ends and
+  //              currently opened file is still opened.
+  //
+  // 2.  An Input Bar will be prompted as :  "File Name to Open: "
+  //       IF user press ESC, Open File command ends and
+  //          currently opened file is still opened.
+  //       Any other inputs with a Return will
+  //          cause currently opened file close.
+  //
+  // 3.  IF user input file name is an existing file , this file will be read
+  //        and opened.
+  //    IF user input file name is a new file, this file will be created
+  //        and opened. This file's type ( UNICODE or ASCII ) is the same
+  //        with the old file.
+  // if current file is modified, so you need to choose
+  // whether to save it first.
+  //
+  if (MainEditor.FileBuffer->FileModified) {
+
+    Status = InputBarSetPrompt (L"File modified. Save (Yes/No/Cancel) ? ");
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // the answer is just one character
+    //
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // loop for user's answer
+    // valid answer is just 'y' 'Y', 'n' 'N', 'c' 'C'
+    //
+    Done = FALSE;
+    while (!Done) {
+      Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+      StatusBarSetRefresh();
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        //
+        // want to save this file first
+        //
+        Status = FileBufferSave (MainEditor.FileBuffer->FileName);
+        if (EFI_ERROR (Status)) {
+          return Status;
+        }
+
+        MainTitleBarRefresh (MainEditor.FileBuffer->FileName, MainEditor.FileBuffer->FileType, MainEditor.FileBuffer->ReadOnly, MainEditor.FileBuffer->FileModified, MainEditor.ScreenSize.Column, MainEditor.ScreenSize.Row);
+        FileBufferRestorePosition ();
+        Done = TRUE;
+        break;
+
+      case L'n':
+      case L'N':
+        //
+        // the file won't be saved
+        //
+        Done = TRUE;
+        break;
+
+      case L'c':
+      case L'C':
+        return EFI_SUCCESS;
+      }
+    }
+  }
+  //
+  // TO get the open file name
+  //
+  Status = InputBarSetPrompt (L"File Name to Open: ");
+  if (EFI_ERROR (Status)) {
+    FileBufferRead (MainEditor.FileBuffer->FileName, TRUE);
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (100);
+  if (EFI_ERROR (Status)) {
+    FileBufferRead (MainEditor.FileBuffer->FileName, TRUE);
+    return Status;
+  }
+
+  while (1) {
+    Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+    StatusBarSetRefresh();
+
+    //
+    // ESC pressed
+    //
+    if (Status == EFI_NOT_READY) {
+      return EFI_SUCCESS;
+    }
+    //
+    // The input string length should > 0
+    //
+    if (StrLen (InputBarGetString()) > 0) {
+      //
+      // CHECK if filename is valid
+      //
+      if (!IsValidFileName (InputBarGetString())) {
+        FileBufferRead (MainEditor.FileBuffer->FileName, TRUE);
+        StatusBarSetStatusString (L"Invalid File Name");
+        return EFI_SUCCESS;
+      }
+
+      break;
+    }
+  }
+  //
+  // read from disk
+  //
+  Status = FileBufferRead (InputBarGetString(), FALSE);
+
+  if (EFI_ERROR (Status)) {
+    FileBufferRead (MainEditor.FileBuffer->FileName, TRUE);
+    return EFI_LOAD_ERROR;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Switch a file from ASCII to UNICODE or vise-versa.
+
+  @retval EFI_SUCCESS           The switch was ok or a warning was presented.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandSwitchFileType (
+  VOID
+  )
+{
+  //
+  // Below is the scenario of File Type command:
+  // After File Type is executed, file type will be changed to another type
+  // if file is read-only, can not be modified
+  //
+  if (MainEditor.FileBuffer->ReadOnly) {
+    StatusBarSetStatusString (L"Read Only File Can Not Be Modified");
+    return EFI_SUCCESS;
+  }
+
+  if (MainEditor.FileBuffer->FileType == FileTypeUnicode) {
+    MainEditor.FileBuffer->FileType = FileTypeAscii;
+  } else {
+    MainEditor.FileBuffer->FileType = FileTypeUnicode;
+  }
+
+  MainEditor.FileBuffer->FileModified = TRUE;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  cut current line to clipboard
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandCutLine (
+  VOID
+  )
+{
+  EFI_STATUS      Status;
+  EFI_EDITOR_LINE *Line;
+
+  //
+  // This command will cut current line ( where cursor is on ) to clip board.
+  //      And cursor will move to the beginning of next line.
+  // Below is the scenario of Cut Line command:
+  // 1.  IF cursor is on valid line, current line will be cut to clip board.
+  //     IF cursor is not on valid line, an Status String will be prompted :
+  //        "Nothing to Cut".
+  //
+  Status = FileBufferCutLine (&Line);
+  if (Status == EFI_NOT_FOUND) {
+    return EFI_SUCCESS;
+  }
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  MainEditor.CutLine = Line;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  paste line to file buffer.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandPasteLine (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+
+  //
+  // Below is the scenario of Paste Line command:
+  // 1.  IF nothing is on clipboard, a Status String will be prompted :
+  //        "No Line to Paste" and Paste Line command ends.
+  //     IF something is on clipboard, insert it above current line.
+  // nothing on clipboard
+  //
+  if (MainEditor.CutLine == NULL) {
+    StatusBarSetStatusString (L"No Line to Paste");
+    return EFI_SUCCESS;
+  }
+
+  Status = FileBufferPasteLine ();
+
+  return Status;
+}
+
+
+/**
+  search string in file buffer
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandSearch (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+  CHAR16      *Buffer;
+  BOOLEAN     Done;
+  UINTN       Offset;
+
+  //
+  // Below is the scenario of Search command:
+  // 1.  An Input Bar will be prompted : "Enter Search String:".
+  //       IF user press ESC, Search command ends.
+  //       IF user just press Enter, Search command ends.
+  //       IF user inputs the search string,  do Step 2.
+  //
+  // 2.  IF input search string is found, cursor will move to the first
+  //        occurrence and do Step 3.
+  //     IF input search string is not found, a Status String
+  //        "Search String Not Found" will be prompted and Search command ends.
+  //
+  // 3.  An Input Bar will be prompted: "Find Next (Yes/No/Cancel ) ?".
+  //      IF user press ESC, Search command ends.
+  //       IF user press 'y' or 'Y', do Step 2.
+  //       IF user press 'n' or 'N', Search command ends.
+  //       IF user press 'c' or 'C', Search command ends.
+  //
+  Status = InputBarSetPrompt (L"Enter Search String: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (40);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+  StatusBarSetRefresh();
+
+  //
+  // ESC
+  //
+  if (Status == EFI_NOT_READY) {
+    return EFI_SUCCESS;
+  }
+  //
+  // just enter pressed
+  //
+  if (StrLen (InputBarGetString()) == 0) {
+    return EFI_SUCCESS;
+  }
+
+  Buffer = CatSPrint (NULL, L"%s", InputBarGetString());
+  if (Buffer == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  //
+  // the first time , search from current position
+  //
+  Offset = 0;
+  do {
+    //
+    // since search may be continued to search multiple times
+    // so we need to backup editor each time
+    //
+    MainEditorBackup ();
+
+    Status = FileBufferSearch (Buffer, Offset);
+
+    if (Status == EFI_NOT_FOUND) {
+      break;
+    }
+    //
+    // Find next
+    //
+    Status = InputBarSetPrompt (L"Find Next (Yes/No) ?");
+    if (EFI_ERROR (Status)) {
+      FreePool (Buffer);
+      return Status;
+    }
+
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      FreePool (Buffer);
+      return Status;
+    }
+
+    Done = FALSE;
+    while (!Done) {
+      Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+      StatusBarSetRefresh();
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        FreePool (Buffer);
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        Done = TRUE;
+        break;
+
+      case L'n':
+      case L'N':
+        FreePool (Buffer);
+        return EFI_SUCCESS;
+
+      }
+      //
+      // end of which
+      //
+    }
+    //
+    // end of while !Done
+    // for search second, third time, search from current position + strlen
+    //
+    Offset = StrLen (Buffer);
+
+  } while (1);
+  //
+  // end of do
+  //
+  FreePool (Buffer);
+  StatusBarSetStatusString (L"Search String Not Found");
+
+  return EFI_SUCCESS;
+}
+
+/*
+  search string in file buffer, and replace it with another str
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandSearchReplace (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+  CHAR16      *Search;
+  CHAR16      *Replace;
+  BOOLEAN     Done;
+  BOOLEAN     First;
+  BOOLEAN     ReplaceOption;
+  UINTN       SearchLen;
+  UINTN       ReplaceLen;
+  BOOLEAN     ReplaceAll;
+
+  ReplaceOption = FALSE;
+
+  //
+  // Below is the scenario of Search/Replace command:
+  // 1.  An Input Bar is prompted : "Enter Search String:".
+  //       IF user press ESC, Search/Replace command ends.
+  //       IF user just press Enter, Search/Replace command ends.
+  //       IF user inputs the search string S, do Step 2.
+  //
+  // 2.  An Input Bar is prompted: "Replace With:".
+  //       IF user press ESC, Search/Replace command ends.
+  //      IF user inputs the replace string R, do Step 3.
+  //
+  // 3.  IF input search string is not found, an Status String
+  //        "Search String Not Found" will be prompted
+  //        and Search/Replace command ends
+  //     IF input search string is found, do Step 4.
+  //
+  // 4.  An Input Bar will be prompted: "Replace ( Yes/No/All/Cancel )?"
+  //       IF user press 'y' or 'Y', S will be replaced with R and do Step 5
+  //       IF user press 'n' or 'N', S will not be replaced and do Step 5.
+  //       IF user press 'a' or 'A', all the S from file current position on
+  //          will be replaced with R and Search/Replace command ends.
+  //       IF user press 'c' or 'C' or ESC, Search/Replace command ends.
+  //
+  // 5.  An Input Bar will be prompted: "Find Next (Yes/No/Cancel) ?".
+  //       IF user press ESC, Search/Replace command ends.
+  //       IF user press 'y' or 'Y', do Step 3.
+  //       IF user press 'n' or 'N', Search/Replace command ends.
+  //       IF user press 'c' or 'C', Search/Replace command ends.
+  // input search string
+  //
+  Status = InputBarSetPrompt (L"Enter Search String: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (40);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+  StatusBarSetRefresh();
+
+  //
+  // ESC
+  //
+  if (Status == EFI_NOT_READY) {
+    return EFI_SUCCESS;
+  }
+  //
+  // if just pressed enter
+  //
+  if (StrLen (InputBarGetString()) == 0) {
+    return EFI_SUCCESS;
+  }
+
+  Search = CatSPrint (NULL, L"%s", InputBarGetString());
+  if (Search == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  SearchLen = StrLen (Search);
+
+  //
+  // input replace string
+  //
+  Status = InputBarSetPrompt (L"Replace With: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (40);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+  StatusBarSetRefresh();
+
+  //
+  // ESC
+  //
+  if (Status == EFI_NOT_READY) {
+    return EFI_SUCCESS;
+  }
+
+  Replace = CatSPrint (NULL, L"%s", InputBarGetString());
+  if (Replace == NULL) {
+    FreePool (Search);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  ReplaceLen  = StrLen (Replace);
+
+  First       = TRUE;
+  ReplaceAll  = FALSE;
+  do {
+    //
+    // since search may be continued to search multiple times
+    // so we need to backup editor each time
+    //
+    MainEditorBackup ();
+
+    if (First) {
+      Status = FileBufferSearch (Search, 0);
+    } else {
+      //
+      // if just replace, so skip this replace string
+      // if replace string is an empty string, so skip to next character
+      //
+      if (ReplaceOption) {
+        Status = FileBufferSearch (Search, (ReplaceLen == 0) ? 1 : ReplaceLen);
+      } else {
+        Status = FileBufferSearch (Search, SearchLen);
+      }
+    }
+
+    if (Status == EFI_NOT_FOUND) {
+      break;
+    }
+    //
+    // replace or not?
+    //
+    Status = InputBarSetPrompt (L"Replace (Yes/No/All/Cancel) ?");
+
+    if (EFI_ERROR (Status)) {
+      FreePool (Search);
+      FreePool (Replace);
+      return Status;
+    }
+
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      FreePool (Search);
+      FreePool (Replace);
+      return Status;
+    }
+
+    Done = FALSE;
+    while (!Done) {
+      Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+      StatusBarSetRefresh();
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        FreePool (Search);
+        FreePool (Replace);
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        Done          = TRUE;
+        ReplaceOption = TRUE;
+        break;
+
+      case L'n':
+      case L'N':
+        Done          = TRUE;
+        ReplaceOption = FALSE;
+        break;
+
+      case L'a':
+      case L'A':
+        Done          = TRUE;
+        ReplaceOption = TRUE;
+        ReplaceAll    = TRUE;
+        break;
+
+      case L'c':
+      case L'C':
+        FreePool (Search);
+        FreePool (Replace);
+        return EFI_SUCCESS;
+
+      }
+      //
+      // end of which
+      //
+    }
+    //
+    // end of while !Done
+    // Decide to Replace
+    //
+    if (ReplaceOption) {
+      //
+      // file is read-only
+      //
+      if (MainEditor.FileBuffer->ReadOnly) {
+        StatusBarSetStatusString (L"Read Only File Can Not Be Modified");
+        return EFI_SUCCESS;
+      }
+      //
+      // replace all
+      //
+      if (ReplaceAll) {
+        Status = FileBufferReplaceAll (Search, Replace, 0);
+        FreePool (Search);
+        FreePool (Replace);
+        return Status;
+      }
+      //
+      // replace
+      //
+      Status = FileBufferReplace (Replace, SearchLen);
+      if (EFI_ERROR (Status)) {
+        FreePool (Search);
+        FreePool (Replace);
+        return Status;
+      }
+    }
+    //
+    // Find next
+    //
+    Status = InputBarSetPrompt (L"Find Next (Yes/No) ?");
+    if (EFI_ERROR (Status)) {
+      FreePool (Search);
+      FreePool (Replace);
+      return Status;
+    }
+
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      FreePool (Search);
+      FreePool (Replace);
+      return Status;
+    }
+
+    Done = FALSE;
+    while (!Done) {
+      Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+      StatusBarSetRefresh();
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        FreePool (Search);
+        FreePool (Replace);
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        Done = TRUE;
+        break;
+
+      case L'n':
+      case L'N':
+        FreePool (Search);
+        FreePool (Replace);
+        return EFI_SUCCESS;
+
+      }
+      //
+      // end of which
+      //
+    }
+    //
+    // end of while !Done
+    //
+    First = FALSE;
+
+  } while (1);
+  //
+  // end of do
+  //
+  FreePool (Search);
+  FreePool (Replace);
+
+  StatusBarSetStatusString (L"Search String Not Found");
+
+  return EFI_SUCCESS;
+}
+
+/**
+  exit editor
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandExit (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+
+  //
+  // Below is the scenario of Exit command:
+  // 1.  IF currently opened file is not modified, exit the editor and
+  //        Exit command ends.
+  //     IF currently opened file is modified, do Step 2
+  //
+  // 2.  An Input Bar will be prompted:
+  //        "File modified. Save ( Yes/No/Cancel )?"
+  //       IF user press 'y' or 'Y', currently opened file will be saved
+  //          and Editor exits
+  //       IF user press 'n' or 'N', currently opened file will not be saved
+  //          and Editor exits.
+  //       IF user press 'c' or 'C' or ESC, Exit command ends.
+  // if file has been modified, so will prompt user whether to save the changes
+  //
+  if (MainEditor.FileBuffer->FileModified) {
+
+    Status = InputBarSetPrompt (L"File modified. Save (Yes/No/Cancel) ? ");
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+
+    while (1) {
+      Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+      StatusBarSetRefresh();
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        //
+        // write file back to disk
+        //
+        Status = FileBufferSave (MainEditor.FileBuffer->FileName);
+        if (!EFI_ERROR (Status)) {
+          EditorExit = TRUE;
+        }
+
+        return Status;
+
+      case L'n':
+      case L'N':
+        EditorExit = TRUE;
+        return EFI_SUCCESS;
+
+      case L'c':
+      case L'C':
+        return EFI_SUCCESS;
+
+      }
+    }
+  }
+
+  EditorExit = TRUE;
+  return EFI_SUCCESS;
+
+}
+
+/**
+  move cursor to specified lines
+
+  @retval EFI_SUCCESS             The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandGotoLine (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+  UINTN       Row;
+
+  //
+  // Below is the scenario of Go To Line command:
+  // 1.  An Input Bar will be prompted : "Go To Line:".
+  //       IF user press ESC, Go To Line command ends.
+  //       IF user just press Enter, cursor remains unchanged.
+  //       IF user inputs line number, do Step 2.
+  //
+  // 2.  IF input line number is valid, move cursor to the beginning
+  //        of specified line and Go To Line command ends.
+  //    IF input line number is invalid, a Status String will be prompted:
+  //        "No Such Line" and Go To Line command ends.
+  //
+  Status = InputBarSetPrompt (L"Go To Line: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+  //
+  // line number's digit <= 6
+  //
+  Status = InputBarSetStringSize (6);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+  StatusBarSetRefresh();
+
+  //
+  // press ESC
+  //
+  if (Status == EFI_NOT_READY) {
+    return EFI_SUCCESS;
+  }
+  //
+  // if JUST press enter
+  //
+  if (StrLen (InputBarGetString()) == 0) {
+    return EFI_SUCCESS;
+  }
+
+  Row = ShellStrToUintn (InputBarGetString());
+
+  //
+  // invalid line number
+  //
+  if (Row > MainEditor.FileBuffer->NumLines || Row <= 0) {
+    StatusBarSetStatusString (L"No Such Line");
+    return EFI_SUCCESS;
+  }
+  //
+  // move cursor to that line's start
+  //
+  FileBufferMovePosition (Row, 1);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Save current file to disk, you can save to current file name or
+  save to another file name.
+  
+  @retval EFI_SUCCESS           The file was saved correctly.
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+  @retval EFI_LOAD_ERROR          A file access error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainCommandSaveFile (
+  VOID
+  )
+{
+  EFI_STATUS        Status;
+  CHAR16            *FileName;
+  BOOLEAN           OldFile;
+  CHAR16            *Str;
+  SHELL_FILE_HANDLE FileHandle;  
+  EFI_FILE_INFO     *Info;
+
+  //
+  // This command will save currently opened file to disk.
+  // You can choose save to another file name or just save to
+  //    current file name.
+  // Below is the scenario of Save File command:
+  //    ( Suppose the old file name is A )
+  // 1.  An Input Bar will be prompted:    "File To Save: [ old file name]"
+  //     IF user press ESC, Save File command ends .
+  //     IF user press Enter, input file name will be A.
+  //     IF user inputs a new file name B,  input file name will be B.
+  //
+  // 2.  IF input file name is A, go to do Step 3.
+  //     IF input file name is B, go to do Step 4.
+  //
+  // 3.  IF A is read only, Status Bar will show "Access Denied" and
+  //       Save File commands ends.
+  //     IF A is not read only, save file buffer to disk and remove modified
+  //       flag in Title Bar , then Save File command ends.
+  //
+  // 4.  IF B does not exist, create this file and save file buffer to it.
+  //       Go to do Step 7.
+  //     IF B exits, do Step 5.
+  //
+  // 5.An Input Bar will be prompted:
+  //      "File Exists. Overwrite ( Yes/No/Cancel )?"
+  //       IF user press 'y' or 'Y', do Step 6.
+  //       IF user press 'n' or 'N', Save File commands ends.
+  //       IF user press 'c' or 'C' or ESC, Save File commands ends.
+  //
+  // 6. IF B is a read-only file, Status Bar will show "Access Denied" and
+  //       Save File commands ends.
+  //    IF B can be read and write, save file buffer to B.
+  //
+  // 7.  Update File Name field in Title Bar to B and remove the modified
+  //       flag in Title Bar.
+  //
+  Str = CatSPrint (NULL, L"File to Save: [%s]", MainEditor.FileBuffer->FileName);
+  if (Str == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  if (StrLen (Str) >= 50) {
+    //
+    // replace the long file name with "..."
+    //
+    Str[46] = L'.';
+    Str[47] = L'.';
+    Str[48] = L'.';
+    Str[49] = L']';
+    Str[50] = CHAR_NULL;
+  }
+
+  Status = InputBarSetPrompt (Str);
+  FreePool(Str);
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+
+  Status = InputBarSetStringSize (100);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+  //
+  // get new file name
+  //
+  Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+  StatusBarSetRefresh();
+
+  //
+  // if user pressed ESC
+  //
+  if (Status == EFI_NOT_READY) {
+    return EFI_SUCCESS;
+  }
+
+  //
+  // if just enter pressed, so think save to current file name
+  //
+  if (StrLen (InputBarGetString()) == 0) {
+    FileName = CatSPrint (NULL, L"%s", MainEditor.FileBuffer->FileName);
+  } else {
+    FileName = CatSPrint (NULL, L"%s", InputBarGetString());
+  }
+
+  if (FileName == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  if (!IsValidFileName (FileName)) {
+    StatusBarSetStatusString (L"Invalid File Name");
+    FreePool (FileName);
+    return EFI_SUCCESS;
+  }
+
+  OldFile = FALSE;
+
+  //
+  // save to the old file
+  //
+  if (StringNoCaseCompare (&FileName, &MainEditor.FileBuffer->FileName) == 0) {
+    OldFile = TRUE;
+  }
+
+  if (OldFile) {
+    //
+    // if the file is read only, so can not write back to it.
+    //
+    if (MainEditor.FileBuffer->ReadOnly == TRUE) {
+      StatusBarSetStatusString (L"Access Denied");
+      FreePool (FileName);
+      return EFI_SUCCESS;
+    }
+  } else {
+    //
+    // if the file exists
+    //
+    if (ShellFileExists(FileName) != EFI_NOT_FOUND) {
+      //
+      // check for read only
+      //
+      Status = ShellOpenFileByName(FileName, &FileHandle, EFI_FILE_MODE_READ, 0);
+      if (EFI_ERROR(Status)) {
+        StatusBarSetStatusString (L"Open Failed");
+        FreePool (FileName);
+        return EFI_SUCCESS;
+      } 
+
+      Info = ShellGetFileInfo(FileHandle);
+      if (Info == NULL) {
+        StatusBarSetStatusString (L"Access Denied");
+        FreePool (FileName);
+        return (EFI_SUCCESS);
+      } 
+      
+      if (Info->Attribute & EFI_FILE_READ_ONLY) {
+        StatusBarSetStatusString (L"Access Denied - Read Only");
+        FreePool (Info);
+        FreePool (FileName);
+        return (EFI_SUCCESS);
+      }
+      FreePool (Info);
+
+      //
+      // ask user whether to overwrite this file
+      //
+      Status = InputBarSetPrompt (L"File exists. Overwrite (Yes/No/Cancel) ? ");
+      if (EFI_ERROR (Status)) {
+        SHELL_FREE_NON_NULL (FileName);
+        return Status;
+      }
+
+      Status = InputBarSetStringSize (1);
+      if (EFI_ERROR (Status)) {
+        SHELL_FREE_NON_NULL (FileName);
+        return Status;
+      }
+
+      while (TRUE) {
+        Status = InputBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+        StatusBarSetRefresh();
+
+        //
+        // ESC pressed
+        //
+        if (Status == EFI_NOT_READY) {
+          SHELL_FREE_NON_NULL (FileName);
+          return EFI_SUCCESS;
+        }
+
+        switch (InputBarGetString()[0]) {
+        case L'y':
+        case L'Y':
+          break;
+
+        case L'n':
+        case L'N':
+        case L'c':
+        case L'C':
+          SHELL_FREE_NON_NULL (FileName);
+          return EFI_SUCCESS;
+        } // end switch
+      } // while (!done)
+    } // file does exist
+  } // if old file name same
+
+  //
+  // save file to disk with specified name
+  //
+  FileBufferSetModified();
+  Status = FileBufferSave (FileName);
+  SHELL_FREE_NON_NULL (FileName);
+
+  return Status;
+}
+
+EFI_EDITOR_COLOR_ATTRIBUTES   OriginalColors;
+INTN                          OriginalMode;
+
+//
+// the first time editor launch
+//
+BOOLEAN                       EditorFirst;
+
+//
+// it's time editor should exit
+//
+BOOLEAN                       EditorExit;
+
+BOOLEAN                       EditorMouseAction;
+
+extern EFI_EDITOR_FILE_BUFFER FileBuffer;
+
+extern BOOLEAN                FileBufferMouseNeedRefresh;
+
+extern EFI_EDITOR_FILE_BUFFER FileBufferBackupVar;
+
+EFI_EDITOR_GLOBAL_EDITOR      MainEditor;
+
+//
+// basic initialization for MainEditor
+//
+EFI_EDITOR_GLOBAL_EDITOR      MainEditorConst = {
+  &FileBuffer,
+  {
+    0,
+    0
+  },
+  {
+    0,
+    0
+  },
+  NULL,
+  FALSE,
+  NULL
+};
+
+/**
+  The initialization function for MainEditor.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainEditorInit (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+  EFI_HANDLE  *HandleBuffer;
+  UINTN       HandleCount;
+  UINTN       Index;
+
+  //
+  // basic initialization
+  //
+  CopyMem (&MainEditor, &MainEditorConst, sizeof (MainEditor));
+
+  //
+  // set screen attributes
+  //
+  MainEditor.ColorAttributes.Colors.Foreground  = gST->ConOut->Mode->Attribute & 0x000000ff;
+
+  MainEditor.ColorAttributes.Colors.Background  = (UINT8) (gST->ConOut->Mode->Attribute >> 4);
+  OriginalColors = MainEditor.ColorAttributes.Colors;
+
+  OriginalMode = gST->ConOut->Mode->Mode;
+
+  //
+  // query screen size
+  //
+  gST->ConOut->QueryMode (
+        gST->ConOut,
+        gST->ConOut->Mode->Mode,
+        &(MainEditor.ScreenSize.Column),
+        &(MainEditor.ScreenSize.Row)
+        );
+
+  //
+  // Find mouse in System Table ConsoleInHandle
+  //
+  Status = gBS->HandleProtocol (
+                gST->ConIn,
+                &gEfiSimplePointerProtocolGuid,
+                (VOID**)&MainEditor.MouseInterface
+                );
+  if (EFI_ERROR (Status)) {
+    //
+    // If there is no Simple Pointer Protocol on System Table
+    //
+    HandleBuffer = NULL;
+    MainEditor.MouseInterface = NULL;
+    Status = gBS->LocateHandleBuffer (
+                  ByProtocol,
+                  &gEfiSimplePointerProtocolGuid,
+                  NULL,
+                  &HandleCount,
+                  &HandleBuffer
+                  );
+    if (!EFI_ERROR (Status) && HandleCount > 0) {
+      //
+      // Try to find the first available mouse device
+      //
+      for (Index = 0; Index < HandleCount; Index++) {
+        Status = gBS->HandleProtocol (
+                      HandleBuffer[Index],
+                      &gEfiSimplePointerProtocolGuid,
+                      (VOID**)&MainEditor.MouseInterface
+                      );
+        if (!EFI_ERROR (Status)) {
+          break;
+        }
+      }
+    }
+    if (HandleBuffer != NULL) {
+      FreePool (HandleBuffer);
+    }
+  }
+
+  if (!EFI_ERROR (Status) && MainEditor.MouseInterface != NULL) {
+    MainEditor.MouseAccumulatorX  = 0;
+    MainEditor.MouseAccumulatorY  = 0;
+    MainEditor.MouseSupported     = TRUE;
+  }
+
+  //
+  // below will call the five components' init function
+  //
+  Status = MainTitleBarInit (L"UEFI EDIT 2.0");
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_LIBEDITOR_TITLEBAR), gShellDebug1HiiHandle);
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = MenuBarInit (MainMenuItems);
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_LIBEDITOR_MAINMENU), gShellDebug1HiiHandle);
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = StatusBarInit ();
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_LIBEDITOR_STATUSBAR), gShellDebug1HiiHandle);
+    return EFI_LOAD_ERROR;
+  }
+
+  InputBarInit ();
+
+  Status = FileBufferInit ();
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_LIBEDITOR_FILEBUFFER), gShellDebug1HiiHandle);
+    return EFI_LOAD_ERROR;
+  }
+  //
+  // clear whole screen and enable cursor
+  //
+  gST->ConOut->ClearScreen (gST->ConOut);
+  gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+
+  //
+  // initialize EditorFirst and EditorExit
+  //
+  EditorFirst       = TRUE;
+  EditorExit        = FALSE;
+  EditorMouseAction = FALSE;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  The cleanup function for MainEditor.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainEditorCleanup (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+
+  //
+  // call the five components' cleanup function
+  // if error, do not exit
+  // just print some warning
+  //
+  MainTitleBarCleanup();
+  StatusBarCleanup();
+  InputBarCleanup();
+  MenuBarCleanup ();
+
+  Status = FileBufferCleanup ();
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_LIBEDITOR_FILEBUFFER_CLEANUP), gShellDebug1HiiHandle);
+  }
+  //
+  // restore old mode
+  //
+  if (OriginalMode != gST->ConOut->Mode->Mode) {
+    gST->ConOut->SetMode (gST->ConOut, OriginalMode);
+  }
+  //
+  // restore old screen color
+  //
+  gST->ConOut->SetAttribute (
+        gST->ConOut,
+        EFI_TEXT_ATTR (OriginalColors.Foreground, OriginalColors.Background)
+        );
+
+  gST->ConOut->ClearScreen (gST->ConOut);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Refresh the main editor component.
+**/
+VOID
+EFIAPI
+MainEditorRefresh (
+  VOID
+  )
+{
+  //
+  // The Stall value is from experience. NOT from spec.  avoids 'flicker'
+  //
+  gBS->Stall (50);
+
+  //
+  // call the components refresh function
+  //
+  if (EditorFirst 
+    || StrCmp (FileBufferBackupVar.FileName, FileBuffer.FileName) != 0 
+    || FileBufferBackupVar.FileType != FileBuffer.FileType 
+    || FileBufferBackupVar.FileModified != FileBuffer.FileModified 
+    || FileBufferBackupVar.ReadOnly != FileBuffer.ReadOnly) {
+
+    MainTitleBarRefresh (MainEditor.FileBuffer->FileName, MainEditor.FileBuffer->FileType, MainEditor.FileBuffer->ReadOnly, MainEditor.FileBuffer->FileModified, MainEditor.ScreenSize.Column, MainEditor.ScreenSize.Row);
+    FileBufferRestorePosition ();
+    FileBufferRefresh ();
+  }
+  if (EditorFirst
+    || FileBufferBackupVar.FilePosition.Row != FileBuffer.FilePosition.Row 
+    || FileBufferBackupVar.FilePosition.Column != FileBuffer.FilePosition.Column 
+    || FileBufferBackupVar.ModeInsert != FileBuffer.ModeInsert
+    || StatusBarGetRefresh()) {
+
+    StatusBarRefresh (EditorFirst, MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column, MainEditor.FileBuffer->FilePosition.Row, MainEditor.FileBuffer->FilePosition.Column, MainEditor.FileBuffer->ModeInsert);
+    FileBufferRestorePosition ();
+    FileBufferRefresh ();
+  }
+
+  if (EditorFirst) {
+    MenuBarRefresh (MainEditor.ScreenSize.Row, MainEditor.ScreenSize.Column);
+    FileBufferRestorePosition ();
+  }
+
+  //
+  // EditorFirst is now set to FALSE
+  //
+  EditorFirst = FALSE;
+}
+
+/**
+  Get's the resultant location of the cursor based on the relative movement of the Mouse.
+
+  @param[in] GuidX    The relative mouse movement.
+
+  @return The X location of the mouse.
+**/
+INT32
+EFIAPI
+GetTextX (
+  IN INT32 GuidX
+  )
+{
+  INT32 Gap;
+
+  MainEditor.MouseAccumulatorX += GuidX;
+  Gap = (MainEditor.MouseAccumulatorX * (INT32) MainEditor.ScreenSize.Column) / (INT32) (50 * (INT32) MainEditor.MouseInterface->Mode->ResolutionX);
+  MainEditor.MouseAccumulatorX = (MainEditor.MouseAccumulatorX * (INT32) MainEditor.ScreenSize.Column) % (INT32) (50 * (INT32) MainEditor.MouseInterface->Mode->ResolutionX);
+  MainEditor.MouseAccumulatorX = MainEditor.MouseAccumulatorX / (INT32) MainEditor.ScreenSize.Column;
+  return Gap;
+}
+
+/**
+  Get's the resultant location of the cursor based on the relative movement of the Mouse.
+
+  @param[in] GuidY    The relative mouse movement.
+
+  @return The Y location of the mouse.
+**/
+INT32
+EFIAPI
+GetTextY (
+  IN INT32 GuidY
+  )
+{
+  INT32 Gap;
+
+  MainEditor.MouseAccumulatorY += GuidY;
+  Gap = (MainEditor.MouseAccumulatorY * (INT32) MainEditor.ScreenSize.Row) / (INT32) (50 * (INT32) MainEditor.MouseInterface->Mode->ResolutionY);
+  MainEditor.MouseAccumulatorY = (MainEditor.MouseAccumulatorY * (INT32) MainEditor.ScreenSize.Row) % (INT32) (50 * (INT32) MainEditor.MouseInterface->Mode->ResolutionY);
+  MainEditor.MouseAccumulatorY = MainEditor.MouseAccumulatorY / (INT32) MainEditor.ScreenSize.Row;
+
+  return Gap;
+}
+
+/**
+  Support mouse movement.  Move the cursor.
+
+  @param[in] MouseState     The current mouse state.
+
+  @retval EFI_SUCCESS       The operation was successful.
+  @retval EFI_NOT_FOUND     There was no mouse support found.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+MainEditorHandleMouseInput (
+  IN EFI_SIMPLE_POINTER_STATE       MouseState
+  )
+{
+
+  INT32           TextX;
+  INT32           TextY;
+  UINTN           FRow;
+  UINTN           FCol;
+
+  LIST_ENTRY  *Link;
+  EFI_EDITOR_LINE *Line;
+
+  UINTN           Index;
+  BOOLEAN         Action;
+
+  //
+  // mouse action means:
+  //    mouse movement
+  //    mouse left button
+  //
+  Action = FALSE;
+
+  //
+  // have mouse movement
+  //
+  if (MouseState.RelativeMovementX || MouseState.RelativeMovementY) {
+    //
+    // handle
+    //
+    TextX = GetTextX (MouseState.RelativeMovementX);
+    TextY = GetTextY (MouseState.RelativeMovementY);
+
+    FileBufferAdjustMousePosition (TextX, TextY);
+
+    Action = TRUE;
+
+  }
+
+  //
+  // if left button pushed down
+  //
+  if (MouseState.LeftButton) {
+
+    FCol = MainEditor.FileBuffer->MousePosition.Column - 1 + 1;
+
+    FRow = MainEditor.FileBuffer->FilePosition.Row +
+      MainEditor.FileBuffer->MousePosition.Row -
+      MainEditor.FileBuffer->DisplayPosition.Row;
+
+    //
+    // beyond the file line length
+    //
+    if (MainEditor.FileBuffer->NumLines < FRow) {
+      FRow = MainEditor.FileBuffer->NumLines;
+    }
+
+    Link = MainEditor.FileBuffer->ListHead->ForwardLink;
+    for (Index = 0; Index < FRow - 1; Index++) {
+      Link = Link->ForwardLink;
+    }
+
+    Line = CR (Link, EFI_EDITOR_LINE, Link, LINE_LIST_SIGNATURE);
+
+    //
+    // beyond the line's column length
+    //
+    if (FCol > Line->Size + 1) {
+      FCol = Line->Size + 1;
+    }
+
+    FileBufferMovePosition (FRow, FCol);
+
+    MainEditor.FileBuffer->MousePosition.Row    = MainEditor.FileBuffer->DisplayPosition.Row;
+
+    MainEditor.FileBuffer->MousePosition.Column = MainEditor.FileBuffer->DisplayPosition.Column;
+
+    Action = TRUE;
+  }
+  //
+  // mouse has action
+  //
+  if (Action) {
+    return EFI_SUCCESS;
+  }
+
+  //
+  // no mouse action
+  //
+  return EFI_NOT_FOUND;
+}
+
+/**
+  Handle user key input. This routes to other functions for the actions.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_LOAD_ERROR          A load error occured.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+MainEditorKeyInput (
+  VOID
+  )
+{
+  EFI_INPUT_KEY             Key;
+  EFI_STATUS                Status;
+  EFI_SIMPLE_POINTER_STATE  MouseState;
+
+  do {
+
+    Status            = EFI_SUCCESS;
+    EditorMouseAction = FALSE;
+
+    //
+    // backup some key elements, so that can aVOID some refresh work
+    //
+    MainEditorBackup ();
+
+    //
+    // change priority of checking mouse/keyboard activity dynamically
+    // so prevent starvation of keyboard.
+    // if last time, mouse moves then this time check keyboard
+    //
+    if (MainEditor.MouseSupported) {
+      Status = MainEditor.MouseInterface->GetState (
+                                            MainEditor.MouseInterface,
+                                            &MouseState
+                                            );
+      if (!EFI_ERROR (Status)) {
+
+        Status = MainEditorHandleMouseInput (MouseState);
+
+        if (!EFI_ERROR (Status)) {
+          EditorMouseAction           = TRUE;
+          FileBufferMouseNeedRefresh  = TRUE;
+        } else if (Status == EFI_LOAD_ERROR) {
+          StatusBarSetStatusString (L"Invalid Mouse Movement ");
+        }
+      }
+    }
+
+    Status = gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);
+    if (!EFI_ERROR (Status)) {
+      //
+      // dispatch to different components' key handling function
+      // so not everywhere has to set this variable
+      //
+      FileBufferMouseNeedRefresh = TRUE;
+      //
+      // clear previous status string
+      //
+      StatusBarSetRefresh();
+
+      //
+      // dispatch to different components' key handling function
+      //
+      if ((Key.ScanCode == SCAN_NULL) || ((Key.ScanCode >= SCAN_UP) && (Key.ScanCode <= SCAN_PAGE_DOWN))) {
+        Status = FileBufferHandleInput (&Key);
+      } else if ((Key.ScanCode >= SCAN_F1) && (Key.ScanCode <= SCAN_F12)) {
+        Status = MenuBarDispatchFunctionKey (&Key);
+      } else {
+        StatusBarSetStatusString (L"Unknown Command");
+        FileBufferMouseNeedRefresh = FALSE;
+      }
+
+      if (Status != EFI_SUCCESS && Status != EFI_OUT_OF_RESOURCES) {
+        //
+        // not already has some error status
+        //
+        if (StatusBarGetString() != NULL && StrCmp (L"", StatusBarGetString()) == 0) {
+          StatusBarSetStatusString (L"Disk Error. Try Again");
+        }
+      }
+
+    }
+    //
+    // after handling, refresh editor
+    //
+    MainEditorRefresh ();
+
+  } while (Status != EFI_OUT_OF_RESOURCES && !EditorExit);
+
+  return Status;
+}
+
+/**
+  Set clipboard
+
+  @param[in] Line   A pointer to the line to be set to clipboard
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_OUT_OF_RESOURCES A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+MainEditorSetCutLine (
+  EFI_EDITOR_LINE *Line
+  )
+{
+  if (Line == NULL) {
+    return EFI_SUCCESS;
+  }
+
+  if (MainEditor.CutLine != NULL) {
+    //
+    // free the old clipboard
+    //
+    LineFree (MainEditor.CutLine);
+  }
+  //
+  // duplicate the line to clipboard
+  //
+  MainEditor.CutLine = LineDup (Line);
+  if (MainEditor.CutLine == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Backup function for MainEditor
+
+  @retval EFI_SUCCESS The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+MainEditorBackup (
+  VOID
+  )
+{
+  FileBufferBackup ();
+  
+  return EFI_SUCCESS;
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/MainTextEditor.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/MainTextEditor.h
new file mode 100644
index 0000000000..c45859deda
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/MainTextEditor.h
@@ -0,0 +1,77 @@
+/** @file
+  Declares editor interface functions.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_EDITOR_H_
+#define _LIB_EDITOR_H_
+
+#include "TextEditorTypes.h"
+
+/**
+  The initialization function for MainEditor.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainEditorInit (
+  VOID
+  );
+
+/**
+  The cleanup function for MainEditor.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_LOAD_ERROR          A load error occured.
+**/
+EFI_STATUS
+EFIAPI
+MainEditorCleanup (
+  VOID
+  );
+
+/**
+  Refresh the main editor component.
+**/
+VOID
+EFIAPI
+MainEditorRefresh (
+  VOID
+  );
+
+/**
+  Handle user key input. This routes to other functions for the actions.
+
+  @retval EFI_SUCCESS             The operation was successful.
+  @retval EFI_LOAD_ERROR          A load error occured.
+  @retval EFI_OUT_OF_RESOURCES    A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+MainEditorKeyInput (
+  VOID
+  );
+
+/**
+  Backup function for MainEditor
+
+  @retval EFI_SUCCESS The operation was successful.
+**/
+EFI_STATUS
+EFIAPI
+MainEditorBackup (
+  VOID
+  );
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/Misc.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/Misc.c
new file mode 100644
index 0000000000..ade78b8f90
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/Misc.c
@@ -0,0 +1,92 @@
+/** @file
+  Implementation of various string and line routines.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "TextEditor.h"
+#include "Misc.h"
+
+/**
+  Duplicate a EFI_EDITOR_LINE structure.
+
+  @param Src                    The line structure to copy from.
+
+  @retval NULL                  A memory allocation failed.
+  @return                       a pointer to the newly allcoated line.
+**/
+EFI_EDITOR_LINE *
+EFIAPI
+LineDup (
+  IN  EFI_EDITOR_LINE *Src
+  )
+{
+  EFI_EDITOR_LINE *Dest;
+
+  //
+  // allocate for the line structure
+  //
+  Dest = AllocateZeroPool (sizeof (EFI_EDITOR_LINE));
+  if (Dest == NULL) {
+    return NULL;
+  }
+  //
+  // allocate and set the line buffer
+  //
+  Dest->Buffer = CatSPrint (NULL, L"%s", Src->Buffer);
+  if (Dest->Buffer == NULL) {
+    FreePool (Dest);
+    return NULL;
+  }
+
+  //
+  // set the other structure members
+  //
+  Dest->Signature = LINE_LIST_SIGNATURE;
+  Dest->Size      = Src->Size;
+  Dest->TotalSize = Dest->Size;
+  Dest->Type      = Src->Type;
+  Dest->Link      = Src->Link;
+
+  return Dest;
+}
+
+/**
+  Free a EFI_EDITOR_LINE structure.
+
+  @param Src                    The line structure to free.
+**/
+VOID
+EFIAPI
+LineFree (
+  IN  EFI_EDITOR_LINE *Src
+  )
+{
+  if (Src == NULL) {
+    return ;
+  }
+  //
+  // free the line buffer and then the line structure itself
+  //
+  SHELL_FREE_NON_NULL (Src->Buffer);
+  SHELL_FREE_NON_NULL (Src);
+
+}
+
+
+
+
+
+
+
+
+
+
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/Misc.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/Misc.h
new file mode 100644
index 0000000000..583de3b42c
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/Misc.h
@@ -0,0 +1,52 @@
+/** @file
+  Declares generic editor helper functions.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_MISC_H_
+#define _LIB_MISC_H_
+
+#include "TextEditorTypes.h"
+
+
+
+/**
+  Free a EFI_EDITOR_LINE structure.
+
+  @param Src                    The line structure to free.
+**/
+VOID
+EFIAPI
+LineFree (
+  IN  EFI_EDITOR_LINE *Src
+  );
+
+/**
+  Duplicate a EFI_EDITOR_LINE structure.
+
+  @param Src                    The line structure to copy from.
+
+  @retval NULL                  A memory allocation failed.
+  @return                       a pointer to the newly allcoated line.
+**/
+EFI_EDITOR_LINE *
+EFIAPI
+LineDup (
+  IN  EFI_EDITOR_LINE *Src
+  );
+
+
+
+
+
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/TextEditStrings.uni b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/TextEditStrings.uni
new file mode 100644
index 0000000000..09a0d47b28
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/TextEditStrings.uni
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/TextEditor.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/TextEditor.h
new file mode 100644
index 0000000000..774f01a291
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/TextEditor.h
@@ -0,0 +1,32 @@
+/** @file
+  Main include file for Edit shell Debug1 function.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _EFI_EDIT_H_
+#define _EFI_EDIT_H_
+
+#include "TextEditorTypes.h"
+
+#include "MainTextEditor.h"
+#include "FileBuffer.h"
+#include "EditTitleBar.h"
+#include "EditStatusBar.h"
+#include "EditInputBar.h"
+#include "EditMenuBar.h"
+#include "Misc.h"
+
+extern EFI_EDITOR_GLOBAL_EDITOR MainEditor;
+extern BOOLEAN                  EditorFirst;
+extern BOOLEAN                  EditorExit;
+
+#endif // _EFI_EDIT_H_
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/TextEditorTypes.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/TextEditorTypes.h
new file mode 100644
index 0000000000..9bcf39e028
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/TextEditorTypes.h
@@ -0,0 +1,102 @@
+/** @file
+  Declares editor types.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _EDITOR_TYPE_H_
+#define _EDITOR_TYPE_H_
+
+#include "UefiShellDebug1CommandsLib.h"
+#include "EditTitleBar.h"
+#include "EditMenuBar.h"
+
+#define MIN_POOL_SIZE         125
+#define MAX_STRING_LENGTH     127
+
+typedef struct {
+  UINTN Row;
+  UINTN Column;
+} EFI_EDITOR_POSITION;
+
+typedef
+EFI_STATUS
+(*EFI_MENU_ITEM_FUNCTION) (
+  VOID
+  );
+
+typedef enum {
+  NewLineTypeDefault,
+  NewLineTypeLineFeed,
+  NewLineTypeCarriageReturn,
+  NewLineTypeCarriageReturnLineFeed,
+  NewLineTypeLineFeedCarriageReturn,
+  NewLineTypeUnknown
+} EE_NEWLINE_TYPE;
+
+#define LINE_LIST_SIGNATURE  'eell'
+typedef struct _EFI_EDITOR_LINE {
+  UINTN           Signature;
+  CHAR16          *Buffer;
+  UINTN           Size;                   // unit is Unicode
+  UINTN           TotalSize;              // unit is Unicode, exclude CHAR_NULL
+  EE_NEWLINE_TYPE Type;
+  LIST_ENTRY      Link;
+} EFI_EDITOR_LINE;
+
+typedef struct {
+  UINT32  Foreground : 4;
+  UINT32  Background : 4;
+} EFI_EDITOR_COLOR_ATTRIBUTES;
+
+typedef union {
+  EFI_EDITOR_COLOR_ATTRIBUTES Colors;
+  UINTN                       Data;
+} EFI_EDITOR_COLOR_UNION;
+
+typedef struct {
+  UINTN Columns;
+  UINTN Rows;
+} EFI_EDITOR_TEXT_MODE;
+
+typedef struct {
+  CHAR16                *FileName;        // file name current edited in editor
+  EDIT_FILE_TYPE        FileType;         // Unicode file or ASCII file
+  LIST_ENTRY            *ListHead;        // list head of lines
+  EFI_EDITOR_LINE       *Lines;           // lines of current file
+  UINTN                 NumLines;         // total line numbers
+  EFI_EDITOR_POSITION   DisplayPosition;  // cursor position in screen
+  EFI_EDITOR_POSITION   FilePosition;     // cursor position in file
+  EFI_EDITOR_POSITION   MousePosition;    // mouse position in screen
+  // file position of first byte displayed on screen
+  //
+  EFI_EDITOR_POSITION   LowVisibleRange;
+
+  BOOLEAN               FileModified;     // file is modified or not
+  BOOLEAN               ModeInsert;       // input mode INS or OVR
+  BOOLEAN               ReadOnly;         // file is read-only or not
+  EFI_EDITOR_LINE       *CurrentLine;     // current line cursor is at
+} EFI_EDITOR_FILE_BUFFER;
+
+typedef struct {
+  EFI_EDITOR_FILE_BUFFER      *FileBuffer;
+
+  EFI_EDITOR_COLOR_UNION      ColorAttributes;
+  EFI_EDITOR_POSITION         ScreenSize; // row number and column number
+  EFI_EDITOR_LINE             *CutLine;   // clip board
+  BOOLEAN                     MouseSupported;
+  EFI_SIMPLE_POINTER_PROTOCOL *MouseInterface;
+  INT32                       MouseAccumulatorX;
+  INT32                       MouseAccumulatorY;
+
+} EFI_EDITOR_GLOBAL_EDITOR;
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/BufferImage.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/BufferImage.c
new file mode 100644
index 0000000000..04ebd24edc
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/BufferImage.c
@@ -0,0 +1,2695 @@
+/** @file
+  Defines HBufferImage - the view of the file that is visible at any point,
+  as well as the event handlers for editing the file
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "HexEditor.h"
+
+extern EFI_HANDLE                 HImageHandleBackup;
+
+extern HEFI_EDITOR_FILE_IMAGE     HFileImage;
+extern HEFI_EDITOR_DISK_IMAGE     HDiskImage;
+extern HEFI_EDITOR_MEM_IMAGE      HMemImage;
+
+extern HEFI_EDITOR_FILE_IMAGE     HFileImageBackupVar;
+extern HEFI_EDITOR_DISK_IMAGE     HDiskImageBackupVar;
+extern HEFI_EDITOR_MEM_IMAGE      HMemImageBackupVar;
+
+extern BOOLEAN                    HEditorMouseAction;
+
+extern HEFI_EDITOR_GLOBAL_EDITOR  HMainEditor;
+extern HEFI_EDITOR_GLOBAL_EDITOR  HMainEditorBackupVar;
+
+HEFI_EDITOR_BUFFER_IMAGE          HBufferImage;
+HEFI_EDITOR_BUFFER_IMAGE          HBufferImageBackupVar;
+
+//
+// for basic initialization of HBufferImage
+//
+HEFI_EDITOR_BUFFER_IMAGE          HBufferImageConst = {
+  NULL,
+  NULL,
+  0,
+  NULL,
+  {
+    0,
+    0
+  },
+  {
+    0,
+    0
+  },
+  {
+    0,
+    0
+  },
+  0,
+  TRUE,
+  FALSE,
+  FileTypeNone,
+  NULL,
+  NULL,
+  NULL
+};
+
+//
+// the whole edit area needs to be refreshed
+//
+BOOLEAN                           HBufferImageNeedRefresh;
+
+//
+// only the current line in edit area needs to be refresh
+//
+BOOLEAN                           HBufferImageOnlyLineNeedRefresh;
+
+BOOLEAN                           HBufferImageMouseNeedRefresh;
+
+EFI_STATUS
+HBufferImageInit (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Initialization function for HBufferImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+
+--*/
+{
+  EFI_STATUS  Status;
+
+  //
+  // basically initialize the HBufferImage
+  //
+  CopyMem (&HBufferImage, &HBufferImageConst, sizeof (HBufferImage));
+
+  //
+  // INIT listhead
+  //
+  HBufferImage.ListHead = AllocateZeroPool (sizeof (LIST_ENTRY));
+  if (HBufferImage.ListHead == NULL) {
+    return EFI_LOAD_ERROR;
+  }
+
+  InitializeListHead (HBufferImage.ListHead);
+
+  HBufferImage.DisplayPosition.Row    = 2;
+  HBufferImage.DisplayPosition.Column = 10;
+  HBufferImage.MousePosition.Row      = 2;
+  HBufferImage.MousePosition.Column   = 10;
+
+  HBufferImage.FileImage              = &HFileImage;
+  HBufferImage.DiskImage              = &HDiskImage;
+  HBufferImage.MemImage               = &HMemImage;
+
+  HBufferImageNeedRefresh             = FALSE;
+  HBufferImageOnlyLineNeedRefresh     = FALSE;
+  HBufferImageMouseNeedRefresh        = FALSE;
+
+  HBufferImageBackupVar.FileImage     = &HFileImageBackupVar;
+  HBufferImageBackupVar.DiskImage     = &HDiskImageBackupVar;
+  HBufferImageBackupVar.MemImage      = &HMemImageBackupVar;
+
+  Status = HFileImageInit ();
+  if (EFI_ERROR (Status)) {
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = HDiskImageInit ();
+  if (EFI_ERROR (Status)) {
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = HMemImageInit ();
+  if (EFI_ERROR (Status)) {
+    return EFI_LOAD_ERROR;
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageBackup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Backup function for HBufferImage
+  Only a few fields need to be backup. 
+  This is for making the file buffer refresh 
+  as few as possible.
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HBufferImageBackupVar.MousePosition   = HBufferImage.MousePosition;
+
+  HBufferImageBackupVar.BufferPosition  = HBufferImage.BufferPosition;
+
+  HBufferImageBackupVar.Modified        = HBufferImage.Modified;
+
+  HBufferImageBackupVar.BufferType      = HBufferImage.BufferType;
+  HBufferImageBackupVar.LowVisibleRow   = HBufferImage.LowVisibleRow;
+  HBufferImageBackupVar.HighBits        = HBufferImage.HighBits;
+
+  //
+  // three kinds of buffer supported
+  //   file buffer
+  //   disk buffer
+  //   memory buffer
+  //
+  switch (HBufferImage.BufferType) {
+  case FileTypeFileBuffer:
+    HFileImageBackup ();
+    break;
+
+  case FileTypeDiskBuffer:
+    HDiskImageBackup ();
+    break;
+
+  case FileTypeMemBuffer:
+    HMemImageBackup ();
+    break;
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageFreeLines (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Free all the lines in HBufferImage
+    Fields affected:
+    Lines
+    CurrentLine
+    NumLines
+    ListHead 
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HFreeLines (HBufferImage.ListHead, HBufferImage.Lines);
+
+  HBufferImage.Lines        = NULL;
+  HBufferImage.CurrentLine  = NULL;
+  HBufferImage.NumLines     = 0;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageCleanup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Cleanup function for HBufferImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  EFI_STATUS  Status;
+
+  //
+  // free all the lines
+  //
+  Status = HBufferImageFreeLines ();
+
+  SHELL_FREE_NON_NULL (HBufferImage.ListHead);
+  HBufferImage.ListHead = NULL;
+
+  HFileImageCleanup ();
+  HDiskImageCleanup ();
+  HMemImageCleanup ();
+
+  return Status;
+
+}
+
+EFI_STATUS
+HBufferImagePrintLine (
+  IN HEFI_EDITOR_LINE           *Line,
+  IN UINTN                      Row,
+  IN UINTN                      FRow,
+  IN HEFI_EDITOR_COLOR_UNION    Orig,
+  IN HEFI_EDITOR_COLOR_UNION    New
+
+  )
+/*++
+
+Routine Description: 
+
+  Print Line on Row
+
+Arguments:  
+
+  Line - Line to print
+  Row  - Row on screen ( begin from 1 )
+  FRow - FRow
+  Orig - Orig
+  New  - Light display
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+
+  UINTN   Index;
+  UINTN   Pos;
+  BOOLEAN Selected;
+  BOOLEAN BeNewColor;
+  UINTN   RowStart;
+  UINTN   RowEnd;
+  UINTN   ColStart;
+  UINTN   ColEnd;
+
+  //
+  // variable initialization
+  //
+  ColStart  = 0;
+  ColEnd    = 0;
+  Selected  = FALSE;
+
+  //
+  // print the selected area in opposite color
+  //
+  if (HMainEditor.SelectStart != 0 && HMainEditor.SelectEnd != 0) {
+    RowStart  = (HMainEditor.SelectStart - 1) / 0x10 + 1;
+    RowEnd    = (HMainEditor.SelectEnd - 1) / 0x10 + 1;
+
+    ColStart  = (HMainEditor.SelectStart - 1) % 0x10 + 1;
+    ColEnd    = (HMainEditor.SelectEnd - 1) % 0x10 + 1;
+
+    if (FRow >= RowStart && FRow <= RowEnd) {
+      Selected = TRUE;
+    }
+
+    if (FRow > RowStart) {
+      ColStart = 1;
+    }
+
+    if (FRow < RowEnd) {
+      ColEnd = 0x10;
+    }
+
+  }
+
+  if (HEditorMouseAction == FALSE) {
+    ShellPrintEx (
+      0,
+      (INT32)Row - 1,
+      L"%8X ",
+      ((INT32)Row - 2 + HBufferImage.LowVisibleRow - 1) * 0x10
+      );
+
+  }
+
+  for (Index = 0; Index < 0x08 && Index < Line->Size; Index++) {
+
+    BeNewColor = FALSE;
+
+    if (Selected) {
+      if (Index + 1 >= ColStart && Index + 1 <= ColEnd) {
+        BeNewColor = TRUE;
+      }
+    }
+
+    if (BeNewColor) {
+      gST->ConOut->SetAttribute (gST->ConOut, New.Data);
+    } else {
+      gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
+    }
+
+    Pos = 10 + (Index * 3);
+    if (Line->Buffer[Index] < 0x10) {
+      ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"0");
+      Pos++;
+    }
+
+    if (Index < 0x07) {
+      ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"%x ", Line->Buffer[Index]);
+    } else {
+      ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"%x  ", Line->Buffer[Index]);
+    }
+
+  }
+
+  gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
+  while (Index < 0x08) {
+    Pos = 10 + (Index * 3);
+    ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"    ");
+    Index++;
+  }
+
+  while (Index < 0x10 && Index < Line->Size) {
+
+    BeNewColor = FALSE;
+
+    if (Selected) {
+      if (Index + 1 >= ColStart && Index + 1 <= ColEnd) {
+        BeNewColor = TRUE;
+      }
+    }
+
+    if (BeNewColor) {
+      gST->ConOut->SetAttribute (gST->ConOut, New.Data);
+    } else {
+      gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
+    }
+
+    Pos = 10 + (Index * 3) + 1;
+    if (Line->Buffer[Index] < 0x10) {
+      ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"0");
+      Pos++;
+    }
+
+    ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"%x ", Line->Buffer[Index]);
+    Index++;
+  }
+
+  gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
+  while (Index < 0x10) {
+    Pos = 10 + (Index * 3) + 1;
+    ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"   ");
+    Index++;
+  }
+  //
+  // restore the original color
+  //
+  gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
+
+  //
+  // PRINT the buffer content
+  //
+  if (HEditorMouseAction == FALSE) {
+    for (Index = 0; Index < 0x10 && Index < Line->Size; Index++) {
+      Pos = ASCII_POSITION + Index;
+
+      //
+      // learned from shelle.h -- IsValidChar
+      //
+      if (Line->Buffer[Index] >= L' ') {
+        ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"%c", (CHAR16) Line->Buffer[Index]);
+      } else {
+        ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"%c", '.');
+      }
+    }
+
+    while (Index < 0x10) {
+      Pos = ASCII_POSITION + Index;
+      ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L" ");
+      Index++;
+    }
+  }
+  //
+  // restore the abundant blank in hex edit area to original color
+  //
+  if (Selected) {
+    if (ColEnd <= 7) {
+      Pos = 10 + (ColEnd - 1) * 3 + 2;
+      ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L" ");
+    } else if (ColEnd == 8) {
+      Pos = 10 + (ColEnd - 1) * 3 + 2;
+      ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L"  ");
+    } else {
+      Pos = 10 + (ColEnd - 1) * 3 + 3;
+      ShellPrintEx ((INT32)Pos - 1, (INT32)Row - 1, L" ");
+    }
+  }
+
+  return EFI_SUCCESS;
+}
+
+BOOLEAN
+HBufferImageIsAtHighBits (
+  IN  UINTN Column,
+  OUT UINTN *FCol
+  )
+{
+  Column -= 10;
+
+  //
+  // NOW AFTER THE SUB, Column start from 0
+  // 23 AND 24 ARE BOTH BLANK
+  //
+  if (Column == 24) {
+    *FCol = 0;
+    return FALSE;
+  }
+
+  if (Column > 24) {
+    Column--;
+  }
+
+  *FCol = (Column / 3) + 1;
+
+  if (!(Column % 3)) {
+    return TRUE;
+  }
+
+  if ((Column % 3 == 2)) {
+    *FCol = 0;
+  }
+
+  return FALSE;
+}
+
+BOOLEAN
+HBufferImageIsInSelectedArea (
+  IN UINTN MouseRow,
+  IN UINTN MouseCol
+  )
+{
+  UINTN FRow;
+  UINTN RowStart;
+  UINTN RowEnd;
+  UINTN ColStart;
+  UINTN ColEnd;
+  UINTN MouseColStart;
+  UINTN MouseColEnd;
+
+  //
+  // judge mouse position whether is in selected area
+  //
+  //
+  // not select
+  //
+  if (HMainEditor.SelectStart == 0 || HMainEditor.SelectEnd == 0) {
+    return FALSE;
+  }
+  //
+  // calculate the select area
+  //
+  RowStart  = (HMainEditor.SelectStart - 1) / 0x10 + 1;
+  RowEnd    = (HMainEditor.SelectEnd - 1) / 0x10 + 1;
+
+  ColStart  = (HMainEditor.SelectStart - 1) % 0x10 + 1;
+  ColEnd    = (HMainEditor.SelectEnd - 1) % 0x10 + 1;
+
+  FRow      = HBufferImage.LowVisibleRow + MouseRow - 2;
+  if (FRow < RowStart || FRow > RowEnd) {
+    return FALSE;
+  }
+
+  if (FRow > RowStart) {
+    ColStart = 1;
+  }
+
+  if (FRow < RowEnd) {
+    ColEnd = 0x10;
+  }
+
+  MouseColStart = 10 + (ColStart - 1) * 3;
+  if (ColStart > 8) {
+    MouseColStart++;
+  }
+
+  MouseColEnd = 10 + (ColEnd - 1) * 3 + 1;
+  if (ColEnd > 8) {
+    MouseColEnd++;
+  }
+
+  if (MouseCol < MouseColStart || MouseCol > MouseColEnd) {
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+EFI_STATUS
+HBufferImageRestoreMousePosition (
+  VOID
+  )
+{
+  HEFI_EDITOR_COLOR_UNION Orig;
+  HEFI_EDITOR_COLOR_UNION New;
+  UINTN                   FRow;
+  UINTN                   FColumn;
+  BOOLEAN                 HasCharacter;
+  HEFI_EDITOR_LINE        *CurrentLine;
+  HEFI_EDITOR_LINE        *Line;
+  UINT8                   Value;
+  BOOLEAN                 HighBits;
+
+  Line = NULL;
+  if (HMainEditor.MouseSupported) {
+
+    if (HBufferImageMouseNeedRefresh) {
+
+      HBufferImageMouseNeedRefresh = FALSE;
+
+      //
+      // if mouse position not moved and only mouse action
+      // so do not need to refresh mouse position
+      //
+      if ((
+            HBufferImage.MousePosition.Row == HBufferImageBackupVar.MousePosition.Row &&
+          HBufferImage.MousePosition.Column == HBufferImageBackupVar.MousePosition.Column
+        ) &&
+          HEditorMouseAction
+          ) {
+        return EFI_SUCCESS;
+      }
+      //
+      // backup the old screen attributes
+      //
+      Orig                  = HMainEditor.ColorAttributes;
+      New.Colors.Foreground = Orig.Colors.Background;
+      New.Colors.Background = Orig.Colors.Foreground;
+
+      //
+      // if in selected area,
+      // so do not need to refresh mouse
+      //
+      if (!HBufferImageIsInSelectedArea (
+            HBufferImageBackupVar.MousePosition.Row,
+            HBufferImageBackupVar.MousePosition.Column
+            )) {
+        gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
+      } else {
+        gST->ConOut->SetAttribute (gST->ConOut, New.Data);
+      }
+      //
+      // clear the old mouse position
+      //
+      FRow = HBufferImage.LowVisibleRow + HBufferImageBackupVar.MousePosition.Row - 2;
+
+      HighBits = HBufferImageIsAtHighBits (
+                  HBufferImageBackupVar.MousePosition.Column,
+                  &FColumn
+                  );
+
+      HasCharacter = TRUE;
+      if (FRow > HBufferImage.NumLines || FColumn == 0) {
+        HasCharacter = FALSE;
+      } else {
+        CurrentLine = HBufferImage.CurrentLine;
+        Line        = HMoveLine (FRow - HBufferImage.BufferPosition.Row);
+
+        if (FColumn > Line->Size) {
+          HasCharacter = FALSE;
+        }
+
+        HBufferImage.CurrentLine = CurrentLine;
+      }
+
+      ShellPrintEx (
+        (INT32)HBufferImageBackupVar.MousePosition.Column - 1,
+        (INT32)HBufferImageBackupVar.MousePosition.Row - 1,
+        L" "
+        );
+
+      if (HasCharacter) {
+        if (HighBits) {
+          Value = (UINT8) (Line->Buffer[FColumn - 1] & 0xf0);
+          Value = (UINT8) (Value >> 4);
+        } else {
+          Value = (UINT8) (Line->Buffer[FColumn - 1] & 0xf);
+        }
+
+        ShellPrintEx (
+          (INT32)HBufferImageBackupVar.MousePosition.Column - 1,
+          (INT32)HBufferImageBackupVar.MousePosition.Row - 1,
+          L"%x",
+          Value
+          );
+      }
+
+      if (!HBufferImageIsInSelectedArea (
+            HBufferImage.MousePosition.Row,
+            HBufferImage.MousePosition.Column
+            )) {
+        gST->ConOut->SetAttribute (gST->ConOut, New.Data);
+      } else {
+        gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
+      }
+      //
+      // clear the old mouse position
+      //
+      FRow = HBufferImage.LowVisibleRow + HBufferImage.MousePosition.Row - 2;
+
+      HighBits = HBufferImageIsAtHighBits (
+                  HBufferImage.MousePosition.Column,
+                  &FColumn
+                  );
+
+      HasCharacter = TRUE;
+      if (FRow > HBufferImage.NumLines || FColumn == 0) {
+        HasCharacter = FALSE;
+      } else {
+        CurrentLine = HBufferImage.CurrentLine;
+        Line        = HMoveLine (FRow - HBufferImage.BufferPosition.Row);
+
+        if (FColumn > Line->Size) {
+          HasCharacter = FALSE;
+        }
+
+        HBufferImage.CurrentLine = CurrentLine;
+      }
+
+      ShellPrintEx (
+        (INT32)HBufferImage.MousePosition.Column - 1,
+        (INT32)HBufferImage.MousePosition.Row - 1,
+        L" "
+        );
+
+      if (HasCharacter) {
+        if (HighBits) {
+          Value = (UINT8) (Line->Buffer[FColumn - 1] & 0xf0);
+          Value = (UINT8) (Value >> 4);
+        } else {
+          Value = (UINT8) (Line->Buffer[FColumn - 1] & 0xf);
+        }
+
+        ShellPrintEx (
+          (INT32)HBufferImage.MousePosition.Column - 1,
+          (INT32)HBufferImage.MousePosition.Row - 1,
+          L"%x",
+          Value
+          );
+      }
+      //
+      // end of HasCharacter
+      //
+      gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
+    }
+    //
+    // end of MouseNeedRefresh
+    //
+  }
+  //
+  // end of MouseSupported
+  //
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageRestorePosition (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Set cursor position according to HBufferImage.DisplayPosition.
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  //
+  // set cursor position
+  //
+  gST->ConOut->SetCursorPosition (
+        gST->ConOut,
+        HBufferImage.DisplayPosition.Column - 1,
+        HBufferImage.DisplayPosition.Row - 1
+        );
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageRefresh (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Refresh function for HBufferImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR 
+
+--*/
+{
+  LIST_ENTRY          *Link;
+  HEFI_EDITOR_LINE        *Line;
+  UINTN                   Row;
+  HEFI_EDITOR_COLOR_UNION Orig;
+  HEFI_EDITOR_COLOR_UNION New;
+
+  UINTN                   StartRow;
+  UINTN                   EndRow;
+  UINTN                   FStartRow;
+  UINTN                   FEndRow;
+  UINTN                   Tmp;
+
+  Orig                  = HMainEditor.ColorAttributes;
+  New.Colors.Foreground = Orig.Colors.Background;
+  New.Colors.Background = Orig.Colors.Foreground;
+
+  //
+  // if it's the first time after editor launch, so should refresh
+  //
+  if (HEditorFirst == FALSE) {
+    //
+    // no definite required refresh
+    // and file position displayed on screen has not been changed
+    //
+    if (HBufferImageNeedRefresh == FALSE &&
+        HBufferImageOnlyLineNeedRefresh == FALSE &&
+        HBufferImageBackupVar.LowVisibleRow == HBufferImage.LowVisibleRow
+        ) {
+      HBufferImageRestoreMousePosition ();
+      HBufferImageRestorePosition ();
+      return EFI_SUCCESS;
+    }
+  }
+
+  gST->ConOut->EnableCursor (gST->ConOut, FALSE);
+
+  //
+  // only need to refresh current line
+  //
+  if (HBufferImageOnlyLineNeedRefresh == TRUE && HBufferImageBackupVar.LowVisibleRow == HBufferImage.LowVisibleRow) {
+
+    HBufferImagePrintLine (
+      HBufferImage.CurrentLine,
+      HBufferImage.DisplayPosition.Row,
+      HBufferImage.BufferPosition.Row,
+      Orig,
+      New
+      );
+  } else {
+    //
+    // the whole edit area need refresh
+    //
+    if (HEditorMouseAction && HMainEditor.SelectStart != 0 && HMainEditor.SelectEnd != 0) {
+      if (HMainEditor.SelectStart != HMainEditorBackupVar.SelectStart) {
+        if (HMainEditor.SelectStart >= HMainEditorBackupVar.SelectStart && HMainEditorBackupVar.SelectStart != 0) {
+          StartRow = (HMainEditorBackupVar.SelectStart - 1) / 0x10 + 1;
+        } else {
+          StartRow = (HMainEditor.SelectStart - 1) / 0x10 + 1;
+        }
+      } else {
+        StartRow = (HMainEditor.SelectStart - 1) / 0x10 + 1;
+      }
+
+      if (HMainEditor.SelectEnd <= HMainEditorBackupVar.SelectEnd) {
+        EndRow = (HMainEditorBackupVar.SelectEnd - 1) / 0x10 + 1;
+      } else {
+        EndRow = (HMainEditor.SelectEnd - 1) / 0x10 + 1;
+      }
+      //
+      // swap
+      //
+      if (StartRow > EndRow) {
+        Tmp       = StartRow;
+        StartRow  = EndRow;
+        EndRow    = Tmp;
+      }
+
+      FStartRow = StartRow;
+      FEndRow   = EndRow;
+
+      StartRow  = 2 + StartRow - HBufferImage.LowVisibleRow;
+      EndRow    = 2 + EndRow - HBufferImage.LowVisibleRow;
+
+    } else {
+      //
+      // not mouse selection actions
+      //
+      FStartRow = HBufferImage.LowVisibleRow;
+      StartRow  = 2;
+      EndRow    = (HMainEditor.ScreenSize.Row - 4);
+    }
+    //
+    // no line
+    //
+    if (HBufferImage.Lines == NULL) {
+      HBufferImageRestoreMousePosition ();
+      HBufferImageRestorePosition ();
+      gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+      return EFI_SUCCESS;
+    }
+    //
+    // get the first line that will be displayed
+    //
+    Line = HMoveLine (FStartRow - HBufferImage.BufferPosition.Row);
+    if (Line == NULL) {
+      gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+      return EFI_LOAD_ERROR;
+    }
+
+    Link  = &(Line->Link);
+    Row   = StartRow;
+    do {
+      Line = CR (Link, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+
+      //
+      // print line at row
+      //
+      HBufferImagePrintLine (
+        Line,
+        Row,
+        HBufferImage.LowVisibleRow + Row - 2,
+        Orig,
+        New
+        );
+
+      Link = Link->ForwardLink;
+      Row++;
+    } while (Link != HBufferImage.ListHead && Row <= EndRow);
+
+    while (Row <= EndRow) {
+      HEditorClearLine (Row);
+      Row++;
+    }
+    //
+    // while not file end and not screen full
+    //
+  }
+
+  HBufferImageRestoreMousePosition ();
+  HBufferImageRestorePosition ();
+
+  HBufferImageNeedRefresh         = FALSE;
+  HBufferImageOnlyLineNeedRefresh = FALSE;
+  gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageRead (
+  IN CONST CHAR16                   *FileName,
+  IN CONST CHAR16                   *DiskName,
+  IN UINTN                          DiskOffset,
+  IN UINTN                          DiskSize,
+  IN UINTN                          MemOffset,
+  IN UINTN                          MemSize,
+  IN EDIT_FILE_TYPE                 BufferType,
+  IN BOOLEAN                        Recover
+  )
+{
+  EFI_STATUS                      Status;
+  EDIT_FILE_TYPE                  BufferTypeBackup;
+
+  //
+  // variable initialization
+  //
+  Status = EFI_SUCCESS;
+
+  //
+  // three types of buffer supported
+  //   file buffer
+  //   disk buffer
+  //   memory buffer
+  //
+  BufferTypeBackup = HBufferImage.BufferType;
+
+  switch (BufferType) {
+  case FileTypeFileBuffer:
+    Status = HFileImageRead (FileName, Recover);
+    break;
+
+  case FileTypeDiskBuffer:
+    Status = HDiskImageRead (DiskName, DiskOffset, DiskSize, Recover);
+    break;
+
+  case FileTypeMemBuffer:
+    Status = HMemImageRead (MemOffset, MemSize, Recover);
+    break;
+  }
+
+  if (EFI_ERROR (Status)) {
+    HBufferImage.BufferType = BufferTypeBackup;
+  }
+
+  return Status;
+}
+
+EFI_STATUS
+HBufferImageSave (
+  IN CHAR16                         *FileName,
+  IN CHAR16                         *DiskName,
+  IN UINTN                          DiskOffset,
+  IN UINTN                          DiskSize,
+  IN UINTN                          MemOffset,
+  IN UINTN                          MemSize,
+  IN EDIT_FILE_TYPE                 BufferType
+  )
+{
+  EFI_STATUS                      Status;
+  EDIT_FILE_TYPE                  BufferTypeBackup;
+
+  //
+  // variable initialization
+  //
+  Status            = EFI_SUCCESS;
+  BufferTypeBackup  = HBufferImage.BufferType;
+
+  switch (HBufferImage.BufferType) {
+  //
+  // file buffer
+  //
+  case FileTypeFileBuffer:
+    Status = HFileImageSave (FileName);
+    break;
+
+  //
+  // disk buffer
+  //
+  case FileTypeDiskBuffer:
+    Status = HDiskImageSave (DiskName, DiskOffset, DiskSize);
+    break;
+
+  //
+  // memory buffer
+  //
+  case FileTypeMemBuffer:
+    Status = HMemImageSave (MemOffset, MemSize);
+    break;
+  }
+
+  if (EFI_ERROR (Status)) {
+    HBufferImage.BufferType = BufferTypeBackup;
+  }
+
+  return Status;
+}
+
+HEFI_EDITOR_LINE *
+HBufferImageCreateLine (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Create a new line and append it to the line list
+    Fields affected:
+    NumLines
+    Lines 
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  NULL -- create line failed
+  Not NULL -- the line created
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+
+  //
+  // allocate for line structure
+  //
+  Line = AllocateZeroPool (sizeof (HEFI_EDITOR_LINE));
+  if (Line == NULL) {
+    return NULL;
+  }
+
+  Line->Signature = EFI_EDITOR_LINE_LIST;
+  Line->Size      = 0;
+
+  HBufferImage.NumLines++;
+
+  //
+  // insert to line list
+  //
+  InsertTailList (HBufferImage.ListHead, &Line->Link);
+
+  if (HBufferImage.Lines == NULL) {
+    HBufferImage.Lines = CR (
+                          HBufferImage.ListHead->ForwardLink,
+                          HEFI_EDITOR_LINE,
+                          Link,
+                          EFI_EDITOR_LINE_LIST
+                          );
+  }
+
+  return Line;
+}
+
+EFI_STATUS
+HBufferImageFree (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Function called when load a new file in. It will free all the old lines
+  and set FileModified field to FALSE
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  //
+  // free all lines
+  //
+  HBufferImageFreeLines ();
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageHandleInput (
+  IN  EFI_INPUT_KEY *Key
+  )
+/*++
+
+Routine Description: 
+
+  Dispatch input to different handler
+
+Arguments:  
+
+  Key -- input key
+   the keys can be:
+     ASCII KEY
+      Backspace/Delete
+      Direction key: up/down/left/right/pgup/pgdn
+      Home/End
+      INS
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  EFI_STATUS  Status;
+
+  Status = EFI_SUCCESS;
+
+  switch (Key->ScanCode) {
+  //
+  // ordinary key
+  //
+  case SCAN_NULL:
+    Status = HBufferImageDoCharInput (Key->UnicodeChar);
+    break;
+
+  //
+  // up arrow
+  //
+  case SCAN_UP:
+    Status = HBufferImageScrollUp ();
+    break;
+
+  //
+  // down arrow
+  //
+  case SCAN_DOWN:
+    Status = HBufferImageScrollDown ();
+    break;
+
+  //
+  // right arrow
+  //
+  case SCAN_RIGHT:
+    Status = HBufferImageScrollRight ();
+    break;
+
+  //
+  // left arrow
+  //
+  case SCAN_LEFT:
+    Status = HBufferImageScrollLeft ();
+    break;
+
+  //
+  // page up
+  //
+  case SCAN_PAGE_UP:
+    Status = HBufferImagePageUp ();
+    break;
+
+  //
+  // page down
+  //
+  case SCAN_PAGE_DOWN:
+    Status = HBufferImagePageDown ();
+    break;
+
+  //
+  // delete
+  //
+  case SCAN_DELETE:
+    Status = HBufferImageDoDelete ();
+    break;
+
+  //
+  // home
+  //
+  case SCAN_HOME:
+    Status = HBufferImageHome ();
+    break;
+
+  //
+  // end
+  //
+  case SCAN_END:
+    Status = HBufferImageEnd ();
+    break;
+
+  default:
+    Status = StatusBarSetStatusString (L"Unknown Command");
+    break;
+  }
+
+  return Status;
+}
+
+EFI_STATUS
+HBufferImageDoCharInput (
+  IN  CHAR16  Char
+  )
+/*++
+
+Routine Description: 
+
+  ASCII key + Backspace + return
+
+Arguments:  
+
+  Char -- input char
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  EFI_STATUS  Status;
+
+  Status = EFI_SUCCESS;
+
+  switch (Char) {
+  case 0:
+    break;
+
+  case 0x08:
+    Status = HBufferImageDoBackspace ();
+    break;
+
+  case 0x09:
+  case 0x0a:
+  case 0x0d:
+    //
+    // Tabs, Returns are thought as nothing
+    //
+    break;
+
+  default:
+    //
+    // DEAL WITH ASCII CHAR, filter out thing like ctrl+f
+    //
+    if (Char > 127 || Char < 32) {
+      Status = StatusBarSetStatusString (L"Unknown Command");
+    } else {
+      Status = HBufferImageAddChar (Char);
+    }
+
+    break;
+  }
+
+  return Status;
+}
+
+INTN
+HBufferImageCharToHex (
+  IN CHAR16 Char
+  )
+/*++
+
+Routine Description: 
+
+  change char to int value based on Hex
+
+Arguments:  
+
+  Char -- input char
+
+Returns:  
+
+  int value;
+
+
+--*/
+{
+  //
+  // change the character to hex
+  //
+  if (Char >= L'0' && Char <= L'9') {
+    return (INTN) (Char - L'0');
+  }
+
+  if (Char >= L'a' && Char <= L'f') {
+    return (INTN) (Char - L'a' + 10);
+  }
+
+  if (Char >= L'A' && Char <= L'F') {
+    return (INTN) (Char - L'A' + 10);
+  }
+
+  return -1;
+}
+
+EFI_STATUS
+HBufferImageAddChar (
+  IN  CHAR16  Char
+  )
+/*++
+
+Routine Description: 
+
+  Add character
+
+Arguments:  
+
+  Char -- input char
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  HEFI_EDITOR_LINE  *NewLine;
+  INTN              Value;
+  UINT8             Old;
+  UINTN             FRow;
+  UINTN             FCol;
+  BOOLEAN           High;
+
+  Value = HBufferImageCharToHex (Char);
+
+  //
+  // invalid input
+  //
+  if (Value == -1) {
+    return EFI_SUCCESS;
+  }
+
+  Line  = HBufferImage.CurrentLine;
+  FRow  = HBufferImage.BufferPosition.Row;
+  FCol  = HBufferImage.BufferPosition.Column;
+  High  = HBufferImage.HighBits;
+
+  //
+  // only needs to refresh current line
+  //
+  HBufferImageOnlyLineNeedRefresh = TRUE;
+
+  //
+  // not a full line and beyond the last character
+  //
+  if (FCol > Line->Size) {
+    //
+    // cursor always at high 4 bits
+    // and always put input to the low 4 bits
+    //
+    Line->Buffer[Line->Size] = (UINT8) Value;
+    Line->Size++;
+    High = FALSE;
+  } else {
+
+    Old = Line->Buffer[FCol - 1];
+
+    //
+    // always put the input to the low 4 bits
+    //
+    Old                     = (UINT8) (Old & 0x0f);
+    Old                     = (UINT8) (Old << 4);
+    Old                     = (UINT8) (Value + Old);
+    Line->Buffer[FCol - 1]  = Old;
+
+    //
+    // at the low 4 bits of the last character of a full line
+    // so if no next line, need to create a new line
+    //
+    if (High == FALSE && FCol == 0x10) {
+
+      HBufferImageOnlyLineNeedRefresh = FALSE;
+      HBufferImageNeedRefresh         = TRUE;
+
+      if (Line->Link.ForwardLink == HBufferImage.ListHead) {
+        //
+        // last line
+        //
+        // create a new line
+        //
+        NewLine = HBufferImageCreateLine ();
+        if (NewLine == NULL) {
+          return EFI_OUT_OF_RESOURCES;
+        }
+        //
+        // end of NULL
+        //
+      }
+      //
+      // end of == ListHead
+      //
+    }
+    //
+    // end of == 0x10
+    //
+    // if already at end of this line, scroll it to the start of next line
+    //
+    if (FCol == 0x10 && High == FALSE) {
+      //
+      // definitely has next line
+      //
+      FRow++;
+      FCol  = 1;
+      High  = TRUE;
+    } else {
+      //
+      // if not at end of this line, just move to next column
+      //
+      if (!High) {
+        FCol++;
+      }
+
+      if (High) {
+        High = FALSE;
+      } else {
+        High = TRUE;
+      }
+
+    }
+    //
+    // end of ==FALSE
+    //
+  }
+  //
+  // move cursor to right
+  //
+  HBufferImageMovePosition (FRow, FCol, High);
+
+  if (!HBufferImage.Modified) {
+    HBufferImage.Modified = TRUE;
+  }
+
+  return EFI_SUCCESS;
+}
+
+BOOLEAN
+HInCurrentScreen (
+  IN  UINTN FileRow
+  )
+/*++
+
+Routine Description: 
+
+  Check user specified FileRow and FileCol is in current screen
+
+Arguments:  
+
+  FileRow -- Row of file position ( start from 1 )
+
+
+Returns:  
+
+  TRUE
+  FALSE
+
+--*/
+{
+  if (FileRow >= HBufferImage.LowVisibleRow && FileRow <= HBufferImage.LowVisibleRow + (HMainEditor.ScreenSize.Row - 5) - 1) {
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+BOOLEAN
+HAboveCurrentScreen (
+  IN  UINTN FileRow
+  )
+/*++
+
+Routine Description: 
+
+  Check user specified FileRow is above current screen
+
+Arguments:  
+
+  FileRow -- Row of file position ( start from 1 )
+  
+Returns:  
+
+  TRUE
+  FALSE
+
+--*/
+{
+  if (FileRow < HBufferImage.LowVisibleRow) {
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+BOOLEAN
+HUnderCurrentScreen (
+  IN  UINTN FileRow
+  )
+/*++
+
+Routine Description: 
+
+  Check user specified FileRow is under current screen
+
+Arguments:  
+
+  FileRow -- Row of file position ( start from 1 )
+
+Returns:  
+
+  TRUE
+  FALSE
+
+--*/
+{
+  if (FileRow > HBufferImage.LowVisibleRow + (HMainEditor.ScreenSize.Row - 5) - 1) {
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+VOID
+HBufferImageMovePosition (
+  IN UINTN    NewFilePosRow,
+  IN UINTN    NewFilePosCol,
+  IN BOOLEAN  HighBits
+  )
+/*++
+
+Routine Description: 
+
+  According to cursor's file position, adjust screen display
+
+Arguments:  
+
+  NewFilePosRow -- Row of file position ( start from 1 )
+  NewFilePosCol -- Column of file position ( start from 1 )   
+  HighBits      -- cursor will on high4 bits or low4 bits
+
+Returns:  
+
+  None
+
+--*/
+{
+  INTN    RowGap;
+  UINTN   Abs;
+  BOOLEAN Above;
+  BOOLEAN Under;
+  UINTN   NewDisplayCol;
+
+  //
+  // CALCULATE gap between current file position and new file position
+  //
+  RowGap                = NewFilePosRow - HBufferImage.BufferPosition.Row;
+
+  Under                 = HUnderCurrentScreen (NewFilePosRow);
+  Above                 = HAboveCurrentScreen (NewFilePosRow);
+
+  HBufferImage.HighBits = HighBits;
+
+  //
+  // if is below current screen
+  //
+  if (Under) {
+    //
+    // display row will be unchanged
+    //
+    HBufferImage.BufferPosition.Row = NewFilePosRow;
+  } else {
+    if (Above) {
+      //
+      // has enough above line, so display row unchanged
+      // not has enough above lines, so the first line is
+      // at the first display line
+      //
+      if (NewFilePosRow < (HBufferImage.DisplayPosition.Row - 2 + 1)) {
+        HBufferImage.DisplayPosition.Row = NewFilePosRow + 2 - 1;
+      }
+
+      HBufferImage.BufferPosition.Row = NewFilePosRow;
+    } else {
+      //
+      // in current screen
+      //
+      HBufferImage.BufferPosition.Row = NewFilePosRow;
+      if (RowGap <= 0) {
+        Abs = -RowGap;
+        HBufferImage.DisplayPosition.Row -= Abs;
+      } else {
+        HBufferImage.DisplayPosition.Row += RowGap;
+      }
+
+    }
+  }
+
+  HBufferImage.LowVisibleRow = HBufferImage.BufferPosition.Row - (HBufferImage.DisplayPosition.Row - 2);
+
+  //
+  // always in current screen
+  //
+  HBufferImage.BufferPosition.Column  = NewFilePosCol;
+
+  NewDisplayCol                       = 10 + (NewFilePosCol - 1) * 3;
+  if (NewFilePosCol > 0x8) {
+    NewDisplayCol++;
+  }
+
+  if (HighBits == FALSE) {
+    NewDisplayCol++;
+  }
+
+  HBufferImage.DisplayPosition.Column = NewDisplayCol;
+
+  //
+  // let CurrentLine point to correct line;
+  //
+  HBufferImage.CurrentLine = HMoveCurrentLine (RowGap);
+
+}
+
+EFI_STATUS
+HBufferImageScrollRight (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Scroll cursor to right
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             FRow;
+  UINTN             FCol;
+
+  //
+  // scroll right will always move to the high4 bits of the next character
+  //
+  HBufferImageNeedRefresh         = FALSE;
+  HBufferImageOnlyLineNeedRefresh = FALSE;
+
+  Line = HBufferImage.CurrentLine;
+
+  FRow = HBufferImage.BufferPosition.Row;
+  FCol = HBufferImage.BufferPosition.Column;
+
+  //
+  // this line is not full and no next line
+  //
+  if (FCol > Line->Size) {
+    return EFI_SUCCESS;
+  }
+  //
+  // if already at end of this line, scroll it to the start of next line
+  //
+  if (FCol == 0x10) {
+    //
+    // has next line
+    //
+    if (Line->Link.ForwardLink != HBufferImage.ListHead) {
+      FRow++;
+      FCol = 1;
+
+    } else {
+      return EFI_SUCCESS;
+    }
+  } else {
+    //
+    // if not at end of this line, just move to next column
+    //
+    FCol++;
+
+  }
+
+  HBufferImageMovePosition (FRow, FCol, TRUE);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageScrollLeft (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Scroll cursor to left
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             FRow;
+  UINTN             FCol;
+
+  HBufferImageNeedRefresh         = FALSE;
+  HBufferImageOnlyLineNeedRefresh = FALSE;
+
+  Line = HBufferImage.CurrentLine;
+
+  FRow = HBufferImage.BufferPosition.Row;
+  FCol = HBufferImage.BufferPosition.Column;
+
+  //
+  // if already at start of this line, so move to the end of previous line
+  //
+  if (FCol <= 1) {
+    //
+    // has previous line
+    //
+    if (Line->Link.BackLink != HBufferImage.ListHead) {
+      FRow--;
+      Line  = CR (Line->Link.BackLink, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+      FCol  = Line->Size;
+    } else {
+      return EFI_SUCCESS;
+    }
+  } else {
+    //
+    // if not at start of this line, just move to previous column
+    //
+    FCol--;
+  }
+
+  HBufferImageMovePosition (FRow, FCol, TRUE);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageScrollDown (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Scroll cursor to the next line
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             FRow;
+  UINTN             FCol;
+  BOOLEAN           HighBits;
+
+  Line      = HBufferImage.CurrentLine;
+
+  FRow      = HBufferImage.BufferPosition.Row;
+  FCol      = HBufferImage.BufferPosition.Column;
+  HighBits  = HBufferImage.HighBits;
+
+  //
+  // has next line
+  //
+  if (Line->Link.ForwardLink != HBufferImage.ListHead) {
+    FRow++;
+    Line = CR (Line->Link.ForwardLink, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+
+    //
+    // if the next line is not that long, so move to end of next line
+    //
+    if (FCol > Line->Size) {
+      FCol      = Line->Size + 1;
+      HighBits  = TRUE;
+    }
+
+  } else {
+    return EFI_SUCCESS;
+  }
+
+  HBufferImageMovePosition (FRow, FCol, HighBits);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageScrollUp (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Scroll cursor to previous line
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             FRow;
+  UINTN             FCol;
+
+  Line  = HBufferImage.CurrentLine;
+
+  FRow  = HBufferImage.BufferPosition.Row;
+  FCol  = HBufferImage.BufferPosition.Column;
+
+  //
+  // has previous line
+  //
+  if (Line->Link.BackLink != HBufferImage.ListHead) {
+    FRow--;
+
+  } else {
+    return EFI_SUCCESS;
+  }
+
+  HBufferImageMovePosition (FRow, FCol, HBufferImage.HighBits);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImagePageDown (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Scroll cursor to next page
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             FRow;
+  UINTN             FCol;
+  UINTN             Gap;
+  BOOLEAN           HighBits;
+
+  Line      = HBufferImage.CurrentLine;
+
+  FRow      = HBufferImage.BufferPosition.Row;
+  FCol      = HBufferImage.BufferPosition.Column;
+  HighBits  = HBufferImage.HighBits;
+
+  //
+  // has next page
+  //
+  if (HBufferImage.NumLines >= FRow + (HMainEditor.ScreenSize.Row - 5)) {
+    Gap = (HMainEditor.ScreenSize.Row - 5);
+  } else {
+    //
+    // MOVE CURSOR TO LAST LINE
+    //
+    Gap = HBufferImage.NumLines - FRow;
+  }
+  //
+  // get correct line
+  //
+  Line = HMoveLine (Gap);
+
+  //
+  // if that line, is not that long, so move to the end of that line
+  //
+  if (FCol > Line->Size) {
+    FCol      = Line->Size + 1;
+    HighBits  = TRUE;
+  }
+
+  FRow += Gap;
+
+  HBufferImageMovePosition (FRow, FCol, HighBits);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImagePageUp (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Scroll cursor to previous page
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             FRow;
+  UINTN             FCol;
+  UINTN             Gap;
+  INTN              Retreat;
+
+  Line  = HBufferImage.CurrentLine;
+
+  FRow  = HBufferImage.BufferPosition.Row;
+  FCol  = HBufferImage.BufferPosition.Column;
+
+  //
+  // has previous page
+  //
+  if (FRow > (HMainEditor.ScreenSize.Row - 5)) {
+    Gap = (HMainEditor.ScreenSize.Row - 5);
+  } else {
+    //
+    // the first line of file will displayed on the first line of screen
+    //
+    Gap = FRow - 1;
+  }
+
+  Retreat = Gap;
+  Retreat = -Retreat;
+
+  //
+  // get correct line
+  //
+  Line = HMoveLine (Retreat);
+
+  FRow -= Gap;
+
+  HBufferImageMovePosition (FRow, FCol, HBufferImage.HighBits);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageHome (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Scroll cursor to start of line
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             FRow;
+  UINTN             FCol;
+  BOOLEAN           HighBits;
+
+  Line = HBufferImage.CurrentLine;
+
+  //
+  // curosr will at the high bit
+  //
+  FRow      = HBufferImage.BufferPosition.Row;
+  FCol      = 1;
+  HighBits  = TRUE;
+
+  //
+  // move cursor position
+  //
+  HBufferImageMovePosition (FRow, FCol, HighBits);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageEnd (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Scroll cursor to end of line
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             FRow;
+  UINTN             FCol;
+  BOOLEAN           HighBits;
+
+  //
+  // need refresh mouse
+  //
+  HBufferImageMouseNeedRefresh  = TRUE;
+
+  Line                          = HBufferImage.CurrentLine;
+
+  FRow                          = HBufferImage.BufferPosition.Row;
+
+  if (Line->Size == 0x10) {
+    FCol      = Line->Size;
+    HighBits  = FALSE;
+  } else {
+    FCol      = Line->Size + 1;
+    HighBits  = TRUE;
+  }
+  //
+  // move cursor position
+  //
+  HBufferImageMovePosition (FRow, FCol, HighBits);
+
+  return EFI_SUCCESS;
+}
+
+UINTN
+HBufferImageGetTotalSize (
+  VOID
+  )
+{
+  UINTN             Size;
+
+  HEFI_EDITOR_LINE  *Line;
+
+  //
+  // calculate the total size of whole line list's buffer
+  //
+  if (HBufferImage.Lines == NULL) {
+    return 0;
+  }
+
+  Line = CR (
+          HBufferImage.ListHead->BackLink,
+          HEFI_EDITOR_LINE,
+          Link,
+          EFI_EDITOR_LINE_LIST
+          );
+  //
+  // one line at most 0x10
+  //
+  Size = 0x10 * (HBufferImage.NumLines - 1) + Line->Size;
+
+  return Size;
+}
+
+EFI_STATUS
+HBufferImageDeleteCharacterFromBuffer (
+  IN  UINTN         Pos,
+  IN  UINTN         Count,
+  OUT UINT8         *DeleteBuffer
+  )
+/*++
+Routine Description:
+
+  Delete character from buffer
+  
+Arguments:
+
+  Pos - Position, Pos starting from 0
+  Count - Count
+  DeleteBuffer - DeleteBuffer
+
+Returns:
+
+  EFI_SUCCESS Success
+  
+--*/
+{
+  UINTN             Index;
+
+  VOID              *Buffer;
+  UINT8             *BufferPtr;
+  UINTN             Size;
+
+  HEFI_EDITOR_LINE  *Line;
+  LIST_ENTRY    *Link;
+  UINTN             StartRow;
+
+  UINTN             OldFCol;
+  UINTN             OldFRow;
+  UINTN             OldPos;
+
+  UINTN             NewPos;
+
+  EFI_STATUS        Status;
+
+  //
+  // get the line that start position is at
+  //
+  StartRow  = Pos / 0x10;
+
+  Size      = HBufferImageGetTotalSize ();
+
+  if (Size < Count) {
+    return EFI_LOAD_ERROR;
+  }
+
+  if (Size == 0) {
+    return EFI_SUCCESS;
+  }
+
+  //
+  // relocate all the HBufferImage fields
+  //
+  OldFRow = HBufferImage.BufferPosition.Row;
+  OldFCol = HBufferImage.BufferPosition.Column;
+  OldPos  = (OldFRow - 1) * 0x10 + OldFCol - 1;
+
+  if (Pos > 0) {
+    //
+    // has character before it,
+    // so locate according to block's previous character
+    //
+    NewPos = Pos - 1;
+
+  } else {
+    //
+    // has no character before it,
+    // so locate according to block's next character
+    //
+    NewPos = 0;
+  }
+
+  HBufferImageMovePosition (NewPos / 0x10 + 1, NewPos % 0x10 + 1, TRUE);
+
+  Buffer = AllocateZeroPool (Size);
+  if (Buffer == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  HBufferImageListToBuffer (Buffer, Size);
+
+  BufferPtr = (UINT8 *) Buffer;
+
+  //
+  // pass deleted buffer out
+  //
+  if (DeleteBuffer != NULL) {
+    for (Index = 0; Index < Count; Index++) {
+      DeleteBuffer[Index] = BufferPtr[Pos + Index];
+    }
+  }
+  //
+  // delete the part from Pos
+  //
+  for (Index = Pos; Index < Size - Count; Index++) {
+    BufferPtr[Index] = BufferPtr[Index + Count];
+  }
+
+  Size -= Count;
+
+  HBufferImageFreeLines ();
+
+  Status = HBufferImageBufferToList (Buffer, Size);
+  FreePool (Buffer);
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Link = HMainEditor.BufferImage->ListHead->ForwardLink;
+  for (Index = 0; Index < NewPos / 0x10; Index++) {
+    Link = Link->ForwardLink;
+  }
+
+  Line                      = CR (Link, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+  HBufferImage.CurrentLine  = Line;
+
+  //
+  // if current cursor position if inside select area
+  // then move it to the block's NEXT character
+  //
+  if (OldPos >= Pos && OldPos < (Pos + Count)) {
+    NewPos = Pos;
+  } else {
+    if (OldPos < Pos) {
+      NewPos = OldPos;
+    } else {
+      NewPos = OldPos - Count;
+    }
+  }
+
+  HBufferImageMovePosition (NewPos / 0x10 + 1, NewPos % 0x10 + 1, TRUE);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageAddCharacterToBuffer (
+  IN  UINTN          Pos,
+  IN  UINTN          Count,
+  IN  UINT8          *AddBuffer
+  )
+/*++'
+Routine Description:
+
+  Add character to buffer, add before pos
+
+Arguments:
+
+  Pos - Position, Pos starting from 0
+  Count - Count
+  AddBuffer - Add buffer
+
+Returns:
+
+  EFI_SUCCESS Success
+  
+--*/
+{
+  INTN              Index;
+
+  VOID              *Buffer;
+  UINT8             *BufferPtr;
+  UINTN             Size;
+
+  HEFI_EDITOR_LINE  *Line;
+
+  LIST_ENTRY    *Link;
+  UINTN             StartRow;
+
+  UINTN             OldFCol;
+  UINTN             OldFRow;
+  UINTN             OldPos;
+
+  UINTN             NewPos;
+
+  //
+  // get the line that start position is at
+  //
+  StartRow  = Pos / 0x10;
+
+  Size      = HBufferImageGetTotalSize ();
+
+  //
+  // relocate all the HBufferImage fields
+  //
+  OldFRow = HBufferImage.BufferPosition.Row;
+  OldFCol = HBufferImage.BufferPosition.Column;
+  OldPos  = (OldFRow - 1) * 0x10 + OldFCol - 1;
+
+  //
+  // move cursor before Pos
+  //
+  if (Pos > 0) {
+    NewPos = Pos - 1;
+  } else {
+    NewPos = 0;
+  }
+
+  HBufferImageMovePosition (NewPos / 0x10 + 1, NewPos % 0x10 + 1, TRUE);
+
+  Buffer = AllocateZeroPool (Size + Count);
+  if (Buffer == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  HBufferImageListToBuffer (Buffer, Size);
+
+  BufferPtr = (UINT8 *) Buffer;
+
+  //
+  // get a place to add
+  //
+  for (Index = (INTN) (Size + Count - 1); Index >= (INTN) Pos; Index--) {
+    BufferPtr[Index] = BufferPtr[Index - Count];
+  }
+  //
+  // add the buffer
+  //
+  for (Index = (INTN) 0; Index < (INTN) Count; Index++) {
+    BufferPtr[Index + Pos] = AddBuffer[Index];
+  }
+
+  Size += Count;
+
+  HBufferImageFreeLines ();
+
+  HBufferImageBufferToList (Buffer, Size);
+
+  FreePool (Buffer);
+
+  Link = HMainEditor.BufferImage->ListHead->ForwardLink;
+  for (Index = 0; Index < (INTN) NewPos / 0x10; Index++) {
+    Link = Link->ForwardLink;
+  }
+
+  Line                      = CR (Link, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+  HBufferImage.CurrentLine  = Line;
+
+  if (OldPos >= Pos) {
+    NewPos = OldPos + Count;
+  } else {
+    NewPos = OldPos;
+  }
+
+  HBufferImageMovePosition (NewPos / 0x10 + 1, NewPos % 0x10 + 1, TRUE);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageDoBackspace (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  delete the previous character
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+
+  UINTN             FileColumn;
+  UINTN             FPos;
+  BOOLEAN           LastLine;
+
+  //
+  // variable initialization
+  //
+  LastLine = FALSE;
+
+  //
+  // already the first character
+  //
+  if (HBufferImage.BufferPosition.Row == 1 && HBufferImage.BufferPosition.Column == 1) {
+    return EFI_SUCCESS;
+  }
+
+  FPos        = (HBufferImage.BufferPosition.Row - 1) * 0x10 + HBufferImage.BufferPosition.Column - 1;
+
+  FileColumn  = HBufferImage.BufferPosition.Column;
+
+  Line        = HBufferImage.CurrentLine;
+  LastLine    = FALSE;
+  if (Line->Link.ForwardLink == HBufferImage.ListHead && FileColumn > 1) {
+    LastLine = TRUE;
+  }
+
+  HBufferImageDeleteCharacterFromBuffer (FPos - 1, 1, NULL);
+
+  //
+  // if is the last line
+  // then only this line need to be refreshed
+  //
+  if (LastLine) {
+    HBufferImageNeedRefresh         = FALSE;
+    HBufferImageOnlyLineNeedRefresh = TRUE;
+  } else {
+    HBufferImageNeedRefresh         = TRUE;
+    HBufferImageOnlyLineNeedRefresh = FALSE;
+  }
+
+  if (!HBufferImage.Modified) {
+    HBufferImage.Modified = TRUE;
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageDoDelete (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Delete current character from line
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+
+  HEFI_EDITOR_LINE  *Line;
+
+  BOOLEAN           LastLine;
+  UINTN             FileColumn;
+  UINTN             FPos;
+
+  FPos        = (HBufferImage.BufferPosition.Row - 1) * 0x10 + HBufferImage.BufferPosition.Column - 1;
+
+  FileColumn  = HBufferImage.BufferPosition.Column;
+
+  Line        = HBufferImage.CurrentLine;
+
+  //
+  // if beyond the last character
+  //
+  if (FileColumn > Line->Size) {
+    return EFI_SUCCESS;
+  }
+
+  LastLine = FALSE;
+  if (Line->Link.ForwardLink == HBufferImage.ListHead) {
+    LastLine = TRUE;
+  }
+
+  HBufferImageDeleteCharacterFromBuffer (FPos, 1, NULL);
+
+  //
+  // if is the last line
+  // then only this line need to be refreshed
+  //
+  if (LastLine) {
+    HBufferImageNeedRefresh         = FALSE;
+    HBufferImageOnlyLineNeedRefresh = TRUE;
+  } else {
+    HBufferImageNeedRefresh         = TRUE;
+    HBufferImageOnlyLineNeedRefresh = FALSE;
+  }
+
+  if (!HBufferImage.Modified) {
+    HBufferImage.Modified = TRUE;
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageBufferToList (
+  IN VOID   *Buffer,
+  IN UINTN  Bytes
+  )
+{
+  UINTN             i;
+  UINTN             j;
+  UINTN             Left;
+  HEFI_EDITOR_LINE  *Line;
+  UINT8             *BufferPtr;
+
+  i         = 0;
+  Left      = 0;
+  BufferPtr = (UINT8 *) Buffer;
+
+  //
+  // parse file content line by line
+  //
+  while (i < Bytes) {
+    if (Bytes - i >= 0x10) {
+      Left = 0x10;
+    } else {
+      Left = Bytes - i;
+    }
+
+    //
+    // allocate a new line
+    //
+    Line = HBufferImageCreateLine ();
+    if (Line == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    Line->Size = Left;
+
+    for (j = 0; j < Left; j++) {
+      Line->Buffer[j] = BufferPtr[i];
+      i++;
+    }
+
+  }
+
+  //
+  // last line is a full line, SO create a new line
+  //
+  if (Left == 0x10 || Bytes == 0) {
+    Line = HBufferImageCreateLine ();
+    if (Line == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HBufferImageListToBuffer (
+  IN VOID   *Buffer,
+  IN UINTN  Bytes
+  )
+{
+  UINTN             Count;
+  UINTN             Index;
+  HEFI_EDITOR_LINE  *Line;
+  LIST_ENTRY    *Link;
+  UINT8             *BufferPtr;
+
+  //
+  // change the line list to a large buffer
+  //
+  if (HBufferImage.Lines == NULL) {
+    return EFI_SUCCESS;
+  }
+
+  Link      = &HBufferImage.Lines->Link;
+  Count     = 0;
+  BufferPtr = (UINT8 *) Buffer;
+
+  //
+  // deal line by line
+  //
+  while (Link != HBufferImage.ListHead) {
+
+    Line = CR (Link, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+
+    if (Count + Line->Size > Bytes) {
+      return EFI_SUCCESS;
+    }
+
+    for (Index = 0; Index < Line->Size; Index++) {
+      BufferPtr[Index] = Line->Buffer[Index];
+    }
+
+    Count += Line->Size;
+    BufferPtr += Line->Size;
+
+    Link = Link->ForwardLink;
+  }
+
+  return EFI_SUCCESS;
+}
+
+VOID
+HBufferImageAdjustMousePosition (
+  IN INT32 TextX,
+  IN INT32 TextY
+  )
+{
+  UINTN X;
+  UINTN Y;
+  UINTN AbsX;
+  UINTN AbsY;
+
+  //
+  // TextX and TextY is mouse movement data returned by mouse driver
+  // This function will change it to MousePosition
+  //
+  //
+  // get absolute X value
+  //
+  if (TextX >= 0) {
+    AbsX = TextX;
+  } else {
+    AbsX = -TextX;
+  }
+  //
+  // get absolute Y value
+  //
+  if (TextY >= 0) {
+    AbsY = TextY;
+  } else {
+    AbsY = -TextY;
+  }
+
+  X = HBufferImage.MousePosition.Column;
+  Y = HBufferImage.MousePosition.Row;
+
+  if (TextX >= 0) {
+    X += TextX;
+  } else {
+    if (X >= AbsX) {
+      X -= AbsX;
+    } else {
+      X = 0;
+    }
+  }
+
+  if (TextY >= 0) {
+    Y += TextY;
+  } else {
+    if (Y >= AbsY) {
+      Y -= AbsY;
+    } else {
+      Y = 0;
+    }
+  }
+  //
+  // check whether new mouse column position is beyond screen
+  // if not, adjust it
+  //
+  if (X >= 10 && X <= (10 + 0x10 * 3 - 1)) {
+    HBufferImage.MousePosition.Column = X;
+  } else if (X < 10) {
+    HBufferImage.MousePosition.Column = 10;
+  } else if (X > (10 + 0x10 * 3 - 1)) {
+    HBufferImage.MousePosition.Column = 10 + 0x10 * 3 - 1;
+  }
+  //
+  // check whether new mouse row position is beyond screen
+  // if not, adjust it
+  //
+  if (Y >= 2 && Y <= (HMainEditor.ScreenSize.Row - 4)) {
+    HBufferImage.MousePosition.Row = Y;
+  } else if (Y < 2) {
+    HBufferImage.MousePosition.Row = 2;
+  } else if (Y > (HMainEditor.ScreenSize.Row - 4)) {
+    HBufferImage.MousePosition.Row = (HMainEditor.ScreenSize.Row - 4);
+  }
+
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/BufferImage.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/BufferImage.h
new file mode 100644
index 0000000000..d661e50524
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/BufferImage.h
@@ -0,0 +1,250 @@
+/** @file
+    Defines BufferImage - the view of the file that is visible at any point, 
+    as well as the event handlers for editing the file
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_BUFFER_IMAGE_H_
+#define _LIB_BUFFER_IMAGE_H_
+
+#include "HexEditor.h"
+
+EFI_STATUS
+HBufferImageInit (
+  VOID
+  );
+EFI_STATUS
+HBufferImageCleanup (
+  VOID
+  );
+EFI_STATUS
+HBufferImageRefresh (
+  VOID
+  );
+EFI_STATUS
+HBufferImageHide (
+  VOID
+  );
+EFI_STATUS
+HBufferImageHandleInput (
+  EFI_INPUT_KEY *
+  );
+EFI_STATUS
+HBufferImageBackup (
+  VOID
+  );
+
+EFI_STATUS
+HBufferImageRead (
+  IN CONST CHAR16   *,
+  IN CONST CHAR16   *,
+  IN          UINTN,
+  IN          UINTN,
+  IN          UINTN,
+  IN          UINTN,
+  IN          EDIT_FILE_TYPE,
+  IN          BOOLEAN
+  );
+
+EFI_STATUS
+HBufferImageSave (
+  IN CHAR16   *,
+  IN CHAR16   *,
+  IN          UINTN,
+  IN          UINTN,
+  IN          UINTN,
+  IN          UINTN,
+  IN          EDIT_FILE_TYPE
+  );
+
+INTN
+HBufferImageCharToHex (
+  IN CHAR16
+  );
+
+EFI_STATUS
+HBufferImageRestoreMousePosition (
+  VOID
+  );
+EFI_STATUS
+HBufferImageRestorePosition (
+  VOID
+  );
+
+VOID
+HBufferImageMovePosition (
+  IN UINTN,
+  IN UINTN,
+  IN BOOLEAN
+  );
+
+EFI_STATUS
+HBufferImageHandleInput (
+  EFI_INPUT_KEY *
+  );
+
+HEFI_EDITOR_LINE  *
+HBufferImageCreateLine (
+  VOID
+  );
+
+EFI_STATUS
+HBufferImageDoCharInput (
+  CHAR16
+  );
+EFI_STATUS
+HBufferImageAddChar (
+  CHAR16
+  );
+
+BOOLEAN
+HInCurrentScreen (
+  UINTN
+  );
+BOOLEAN
+HAboveCurrentScreen (
+  UINTN
+  );
+BOOLEAN
+HUnderCurrentScreen (
+  UINTN
+  );
+
+EFI_STATUS
+HBufferImageScrollRight (
+  VOID
+  );
+EFI_STATUS
+HBufferImageScrollLeft (
+  VOID
+  );
+EFI_STATUS
+HBufferImageScrollDown (
+  VOID
+  );
+EFI_STATUS
+HBufferImageScrollUp (
+  VOID
+  );
+EFI_STATUS
+HBufferImagePageUp (
+  VOID
+  );
+EFI_STATUS
+HBufferImagePageDown (
+  VOID
+  );
+EFI_STATUS
+HBufferImageHome (
+  VOID
+  );
+EFI_STATUS
+HBufferImageEnd (
+  VOID
+  );
+
+EFI_STATUS
+HBufferImageDoBackspace (
+  VOID
+  );
+EFI_STATUS
+HBufferImageDoDelete (
+  VOID
+  );
+
+EFI_STATUS
+HBufferImageCutLine (
+  HEFI_EDITOR_LINE **
+  );
+EFI_STATUS
+HBufferImagePasteLine (
+  VOID
+  );
+
+EFI_STATUS
+HBufferImageGetFileInfo (
+  EFI_FILE_HANDLE,
+  CHAR16          *,
+  EFI_FILE_INFO   **
+  );
+
+EFI_STATUS
+HBufferImageSearch (
+  CHAR16  *,
+  UINTN
+  );
+EFI_STATUS
+HBufferImageReplace (
+  CHAR16  *,
+  UINTN
+  );
+
+EFI_STATUS
+HBufferImageFree (
+  VOID
+  ) ;
+
+EFI_STATUS
+HBufferImageDeleteCharacterFromBuffer (
+  IN      UINTN,
+  IN      UINTN,
+  UINT8   *
+  );
+
+EFI_STATUS
+HBufferImageAddCharacterToBuffer (
+  IN      UINTN,
+  IN      UINTN,
+  UINT8   *
+  );
+
+EFI_STATUS
+HBufferImageBufferToList (
+  IN VOID   *,
+  IN        UINTN
+  );
+
+EFI_STATUS
+HBufferImageListToBuffer (
+  IN VOID   *,
+  IN        UINTN
+  );
+
+VOID
+HBufferImageAdjustMousePosition (
+  INT32,
+  INT32
+  );
+
+BOOLEAN
+HBufferImageIsAtHighBits (
+  UINTN,
+  UINTN *
+  ) ;
+
+EFI_STATUS
+HBufferImageCutLine (
+  HEFI_EDITOR_LINE **
+  );
+
+UINTN
+HBufferImageGetTotalSize (
+  VOID
+  );
+
+BOOLEAN
+HBufferImageIsInSelectedArea (
+  UINTN,
+  UINTN
+  );
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Clipboard.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Clipboard.c
new file mode 100644
index 0000000000..2408027abb
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Clipboard.c
@@ -0,0 +1,112 @@
+/** @file
+    Functions to deal with Clip Board
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "HexEditor.h"
+
+HEFI_EDITOR_CLIPBOARD HClipBoard;
+
+//
+// for basic initialization of HClipBoard
+//
+HEFI_EDITOR_CLIPBOARD HClipBoardConst = {
+  NULL,
+  0
+};
+
+EFI_STATUS
+HClipBoardInit (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Initialization function for HDiskImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+
+--*/
+{
+  //
+  // basiclly initialize the HDiskImage
+  //
+  CopyMem (&HClipBoard, &HClipBoardConst, sizeof (HClipBoard));
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HClipBoardCleanup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Initialization function for HDiskImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+
+--*/
+{
+
+  SHELL_FREE_NON_NULL (HClipBoard.Buffer);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HClipBoardSet (
+  IN UINT8 *Buffer,
+  IN UINTN Size
+  )
+{
+  //
+  // free the old clipboard buffer
+  // and set new clipboard buffer
+  //
+  SHELL_FREE_NON_NULL (HClipBoard.Buffer);
+  HClipBoard.Buffer = Buffer;
+
+  HClipBoard.Size   = Size;
+
+  return EFI_SUCCESS;
+}
+
+UINTN
+HClipBoardGet (
+  OUT UINT8  **Buffer
+  )
+{
+  //
+  // return the clipboard buffer
+  //
+  *Buffer = HClipBoard.Buffer;
+
+  return HClipBoard.Size;
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Clipboard.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Clipboard.h
new file mode 100644
index 0000000000..9165d98f30
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Clipboard.h
@@ -0,0 +1,40 @@
+/** @file
+    Defines DiskImage - the view of the file that is visible at any point, 
+    as well as the event handlers for editing the file
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_CLIP_BOARD_H_
+#define _LIB_CLIP_BOARD_H_
+
+#include "HexEditor.h"
+
+EFI_STATUS
+HClipBoardInit (
+  VOID
+  );
+EFI_STATUS
+HClipBoardCleanup (
+  VOID
+  );
+
+EFI_STATUS
+HClipBoardSet (
+  UINT8   *,
+  UINTN
+  );
+UINTN
+HClipBoardGet (
+  UINT8 **
+  );
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/DiskImage.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/DiskImage.c
new file mode 100644
index 0000000000..140db71671
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/DiskImage.c
@@ -0,0 +1,487 @@
+/** @file
+  Functions to deal with Disk buffer.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "HexEditor.h"
+#include <Protocol/BlockIo.h>
+
+extern EFI_HANDLE                 HImageHandleBackup;
+extern HEFI_EDITOR_BUFFER_IMAGE   HBufferImage;
+
+extern BOOLEAN                    HBufferImageNeedRefresh;
+extern BOOLEAN                    HBufferImageOnlyLineNeedRefresh;
+extern BOOLEAN                    HBufferImageMouseNeedRefresh;
+
+extern HEFI_EDITOR_GLOBAL_EDITOR  HMainEditor;
+
+HEFI_EDITOR_DISK_IMAGE            HDiskImage;
+HEFI_EDITOR_DISK_IMAGE            HDiskImageBackupVar;
+
+//
+// for basic initialization of HDiskImage
+//
+HEFI_EDITOR_DISK_IMAGE            HDiskImageConst = {
+  NULL,
+  0,
+  0,
+  0
+};
+
+EFI_STATUS
+HDiskImageInit (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Initialization function for HDiskImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+
+--*/
+{
+  //
+  // basically initialize the HDiskImage
+  //
+  CopyMem (&HDiskImage, &HDiskImageConst, sizeof (HDiskImage));
+
+  CopyMem (&HDiskImageBackupVar, &HDiskImageConst, sizeof (HDiskImageBackupVar));
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HDiskImageBackup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Backup function for HDiskImage
+  Only a few fields need to be backup. 
+  This is for making the Disk buffer refresh 
+  as few as possible.
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS          - Success
+  EFI_OUT_OF_RESOURCES - gST->ConOut of resources
+
+--*/
+{
+  //
+  // backup the disk name, offset and size
+  //
+  //
+  SHELL_FREE_NON_NULL (HDiskImageBackupVar.Name);
+
+  HDiskImageBackupVar.Name = CatSPrint(NULL, L"%s", HDiskImage.Name);
+  if (HDiskImageBackupVar.Name == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  HDiskImageBackupVar.Offset  = HDiskImage.Offset;
+  HDiskImageBackupVar.Size    = HDiskImage.Size;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HDiskImageCleanup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Cleanup function for HDiskImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  SHELL_FREE_NON_NULL (HDiskImage.Name);
+  SHELL_FREE_NON_NULL (HDiskImageBackupVar.Name);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+HDiskImageSetDiskNameOffsetSize (
+  IN CONST CHAR16   *Str,
+  IN UINTN    Offset,
+  IN UINTN    Size
+  )
+/*++
+
+Routine Description: 
+
+  Set FileName field in HFileImage
+
+Arguments:  
+
+  Str    - File name to set
+  Offset - The offset
+  Size   - The size
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  UINTN Len;
+  UINTN Index;
+
+  //
+  // free the old file name
+  //
+  SHELL_FREE_NON_NULL (HDiskImage.Name);
+
+  Len             = StrLen (Str);
+
+  HDiskImage.Name = AllocateZeroPool (2 * (Len + 1));
+  if (HDiskImage.Name == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  for (Index = 0; Index < Len; Index++) {
+    HDiskImage.Name[Index] = Str[Index];
+  }
+
+  HDiskImage.Name[Len]  = L'\0';
+
+  HDiskImage.Offset     = Offset;
+  HDiskImage.Size       = Size;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HDiskImageRead (
+  IN CONST CHAR16   *DeviceName,
+  IN UINTN    Offset,
+  IN UINTN    Size,
+  IN BOOLEAN  Recover
+  )
+/*++
+
+Routine Description: 
+
+  Read a disk from disk into HBufferImage
+
+Arguments:  
+
+  DeviceName - filename to read
+  Offset     - The offset
+  Size       - The size
+  Recover    - if is for recover, no information print
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+  EFI_OUT_OF_RESOURCES
+  EFI_INVALID_PARAMETER 
+  
+--*/
+{
+  CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
+  EFI_DEVICE_PATH_PROTOCOL        *DupDevicePath;
+  EFI_HANDLE                      Handle;
+  EFI_BLOCK_IO_PROTOCOL           *BlkIo;
+  EFI_STATUS                      Status;
+
+  VOID                            *Buffer;
+  CHAR16                          *Str;
+  UINTN                           Bytes;
+
+  HEFI_EDITOR_LINE                *Line;
+  UINT64                          ByteOffset;
+
+  EDIT_FILE_TYPE                  BufferTypeBackup;
+
+  BufferTypeBackup        = HBufferImage.BufferType;
+  HBufferImage.BufferType = FileTypeDiskBuffer;
+
+  DevicePath              = gEfiShellProtocol->GetDevicePathFromMap(DeviceName);
+  if (DevicePath == NULL) {
+    StatusBarSetStatusString (L"Cannot Find Device");
+    return EFI_INVALID_PARAMETER;
+  }
+  DupDevicePath = DuplicateDevicePath(DevicePath);
+  //
+  // get blkio interface
+  //
+  Status = gBS->LocateDevicePath(&gEfiBlockIoProtocolGuid,&DupDevicePath,&Handle);
+  FreePool(DupDevicePath);
+  if (EFI_ERROR (Status)) {
+    StatusBarSetStatusString (L"Read Disk Failed");
+    return Status;
+  }
+  Status = gBS->OpenProtocol(Handle, &gEfiBlockIoProtocolGuid, (VOID**)&BlkIo, gImageHandle, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+  if (EFI_ERROR (Status)) {
+    StatusBarSetStatusString (L"Read Disk Failed");
+    return Status;
+  }
+  //
+  // if Offset exceeds LastBlock,
+  //   return error
+  //
+  if (Offset > BlkIo->Media->LastBlock || Offset + Size > BlkIo->Media->LastBlock) {
+    StatusBarSetStatusString (L"Invalid Offset + Size");
+    return EFI_LOAD_ERROR;
+  }
+
+  Bytes   = BlkIo->Media->BlockSize * Size;
+  Buffer  = AllocateZeroPool (Bytes);
+
+  if (Buffer == NULL) {
+    StatusBarSetStatusString (L"Read Disk Failed");
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  ByteOffset = MultU64x32 (Offset, BlkIo->Media->BlockSize);
+
+  //
+  // read from disk
+  //
+  Status = BlkIo->ReadBlocks (
+                    BlkIo,
+                    BlkIo->Media->MediaId,
+                    Offset,
+                    Bytes,
+                    Buffer
+                    );
+
+  if (EFI_ERROR (Status)) {
+    FreePool (Buffer);
+    StatusBarSetStatusString (L"Read Disk Failed");
+    return EFI_LOAD_ERROR;
+  }
+
+  HBufferImageFree ();
+
+  //
+  // convert buffer to line list
+  //
+  Status = HBufferImageBufferToList (Buffer, Bytes);
+  FreePool (Buffer);
+
+  if (EFI_ERROR (Status)) {
+    StatusBarSetStatusString (L"Read Disk Failed");
+    return Status;
+  }
+
+  Status = HDiskImageSetDiskNameOffsetSize (DeviceName, Offset, Size);
+  if (EFI_ERROR (Status)) {
+    StatusBarSetStatusString (L"Read Disk Failed");
+    return EFI_OUT_OF_RESOURCES;
+  }
+  //
+  // initialize some variables
+  //
+  HDiskImage.BlockSize                = BlkIo->Media->BlockSize;
+
+  HBufferImage.DisplayPosition.Row    = 2;
+  HBufferImage.DisplayPosition.Column = 10;
+
+  HBufferImage.MousePosition.Row      = 2;
+  HBufferImage.MousePosition.Column   = 10;
+
+  HBufferImage.LowVisibleRow          = 1;
+  HBufferImage.HighBits               = TRUE;
+
+  HBufferImage.BufferPosition.Row     = 1;
+  HBufferImage.BufferPosition.Column  = 1;
+
+  if (!Recover) {
+    Str = CatSPrint(NULL, L"%d Lines Read", HBufferImage.NumLines);
+    if (Str == NULL) {
+      StatusBarSetStatusString (L"Read Disk Failed");
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    StatusBarSetStatusString (Str);
+    SHELL_FREE_NON_NULL (Str);
+
+    HMainEditor.SelectStart = 0;
+    HMainEditor.SelectEnd   = 0;
+
+  }
+
+  //
+  // has line
+  //
+  if (HBufferImage.Lines != NULL) {
+    HBufferImage.CurrentLine = CR (
+                                HBufferImage.ListHead->ForwardLink,
+                                HEFI_EDITOR_LINE,
+                                Link,
+                                EFI_EDITOR_LINE_LIST
+                                );
+  } else {
+    //
+    // create a dummy line
+    //
+    Line = HBufferImageCreateLine ();
+    if (Line == NULL) {
+      StatusBarSetStatusString (L"Read Disk Failed");
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    HBufferImage.CurrentLine = Line;
+  }
+
+  HBufferImage.Modified           = FALSE;
+  HBufferImageNeedRefresh         = TRUE;
+  HBufferImageOnlyLineNeedRefresh = FALSE;
+  HBufferImageMouseNeedRefresh    = TRUE;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HDiskImageSave (
+  IN CHAR16 *DeviceName,
+  IN UINTN  Offset,
+  IN UINTN  Size
+  )
+/*++
+
+Routine Description: 
+
+  Save lines in HBufferImage to disk
+  NOT ALLOW TO WRITE TO ANOTHER DISK!!!!!!!!!
+
+Arguments:  
+
+  DeviceName - The device name
+  Offset     - The offset
+  Size       - The size
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+  EFI_OUT_OF_RESOURCES
+  EFI_INVALID_PARAMETER
+
+--*/
+{
+
+  CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
+  EFI_DEVICE_PATH_PROTOCOL        *DupDevicePath;
+  EFI_BLOCK_IO_PROTOCOL           *BlkIo;
+  EFI_STATUS                      Status;
+  EFI_HANDLE                      Handle;
+  VOID                            *Buffer;
+  UINTN                           Bytes;
+
+  UINT64                          ByteOffset;
+
+  EDIT_FILE_TYPE                  BufferTypeBackup;
+
+  //
+  // if not modified, directly return
+  //
+  if (HBufferImage.Modified == FALSE) {
+    return EFI_SUCCESS;
+  }
+
+  BufferTypeBackup        = HBufferImage.BufferType;
+  HBufferImage.BufferType = FileTypeDiskBuffer;
+
+  DevicePath              = gEfiShellProtocol->GetDevicePathFromMap(DeviceName);
+  if (DevicePath == NULL) {
+//    StatusBarSetStatusString (L"Cannot Find Device");
+    return EFI_INVALID_PARAMETER;
+  }
+  DupDevicePath = DuplicateDevicePath(DevicePath);
+
+  //
+  // get blkio interface
+  //
+  Status = gBS->LocateDevicePath(&gEfiBlockIoProtocolGuid,&DupDevicePath,&Handle);
+  FreePool(DupDevicePath);
+  if (EFI_ERROR (Status)) {
+//    StatusBarSetStatusString (L"Read Disk Failed");
+    return Status;
+  }
+  Status = gBS->OpenProtocol(Handle, &gEfiBlockIoProtocolGuid, (VOID**)&BlkIo, gImageHandle, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+  if (EFI_ERROR (Status)) {
+//    StatusBarSetStatusString (L"Read Disk Failed");
+    return Status;
+  }
+
+  Bytes   = BlkIo->Media->BlockSize * Size;
+  Buffer  = AllocateZeroPool (Bytes);
+
+  if (Buffer == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  //
+  // concatenate the line list to a buffer
+  //
+  Status = HBufferImageListToBuffer (Buffer, Bytes);
+  if (EFI_ERROR (Status)) {
+    FreePool (Buffer);
+    return Status;
+  }
+
+  ByteOffset = MultU64x32 (Offset, BlkIo->Media->BlockSize);
+
+  //
+  // write the buffer to disk
+  //
+  Status = BlkIo->WriteBlocks (
+                    BlkIo,
+                    BlkIo->Media->MediaId,
+                    Offset,
+                    Bytes,
+                    Buffer
+                    );
+
+  FreePool (Buffer);
+
+  if (EFI_ERROR (Status)) {
+    return EFI_LOAD_ERROR;
+  }
+  //
+  // now not modified
+  //
+  HBufferImage.Modified = FALSE;
+
+  return EFI_SUCCESS;
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/DiskImage.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/DiskImage.h
new file mode 100644
index 0000000000..eaa8e2615d
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/DiskImage.h
@@ -0,0 +1,48 @@
+/** @file
+  Defines DiskImage - the view of the file that is visible at any point, 
+  as well as the event handlers for editing the file
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_DISK_IMAGE_H_
+#define _LIB_DISK_IMAGE_H_
+
+#include "HexEditor.h"
+
+EFI_STATUS
+HDiskImageInit (
+  VOID
+  );
+EFI_STATUS
+HDiskImageCleanup (
+  VOID
+  );
+EFI_STATUS
+HDiskImageBackup (
+  VOID
+  );
+
+EFI_STATUS
+HDiskImageRead (
+  IN CONST CHAR16   *,
+  IN          UINTN,
+  IN          UINTN,
+  IN          BOOLEAN
+  );
+EFI_STATUS
+HDiskImageSave (
+  IN CHAR16   *,
+  IN          UINTN,
+  IN          UINTN
+  );
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/FileImage.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/FileImage.c
new file mode 100644
index 0000000000..adf7928197
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/FileImage.c
@@ -0,0 +1,504 @@
+/** @file
+  Functions to deal with file buffer.
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "HexEditor.h"
+
+extern EFI_HANDLE                 HImageHandleBackup;
+extern HEFI_EDITOR_BUFFER_IMAGE   HBufferImage;
+
+extern BOOLEAN                    HBufferImageNeedRefresh;
+extern BOOLEAN                    HBufferImageOnlyLineNeedRefresh;
+extern BOOLEAN                    HBufferImageMouseNeedRefresh;
+
+extern HEFI_EDITOR_GLOBAL_EDITOR  HMainEditor;
+
+HEFI_EDITOR_FILE_IMAGE            HFileImage;
+HEFI_EDITOR_FILE_IMAGE            HFileImageBackupVar;
+
+//
+// for basic initialization of HFileImage
+//
+HEFI_EDITOR_BUFFER_IMAGE          HFileImageConst = {
+  NULL,
+  0,
+  FALSE
+};
+
+EFI_STATUS
+HFileImageInit (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Initialization function for HFileImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+
+--*/
+{
+  //
+  // basically initialize the HFileImage
+  //
+  CopyMem (&HFileImage, &HFileImageConst, sizeof (HFileImage));
+
+  CopyMem (
+    &HFileImageBackupVar,
+    &HFileImageConst,
+    sizeof (HFileImageBackupVar)
+    );
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HFileImageBackup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Backup function for HFileImage
+  Only a few fields need to be backup. 
+  This is for making the file buffer refresh 
+  as few as possible.
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  SHELL_FREE_NON_NULL (HFileImageBackupVar.FileName);
+  HFileImageBackupVar.FileName = CatSPrint(NULL, L"%s", HFileImage.FileName);
+  if (HFileImageBackupVar.FileName == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HFileImageCleanup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Cleanup function for HFileImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+
+  SHELL_FREE_NON_NULL (HFileImage.FileName);
+  SHELL_FREE_NON_NULL (HFileImageBackupVar.FileName);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HFileImageSetFileName (
+  IN CONST CHAR16 *Str
+  )
+/*++
+
+Routine Description: 
+
+  Set FileName field in HFileImage
+
+Arguments:  
+
+  Str -- File name to set
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  UINTN Size;
+  UINTN Index;
+
+  //
+  // free the old file name
+  //
+  SHELL_FREE_NON_NULL (HFileImage.FileName);
+
+  Size                = StrLen (Str);
+
+  HFileImage.FileName = AllocateZeroPool (2 * (Size + 1));
+  if (HFileImage.FileName == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  for (Index = 0; Index < Size; Index++) {
+    HFileImage.FileName[Index] = Str[Index];
+  }
+
+  HFileImage.FileName[Size] = L'\0';
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HFileImageGetFileInfo (
+  IN  EFI_FILE_HANDLE Handle,
+  IN  CHAR16          *FileName,
+  OUT EFI_FILE_INFO   **InfoOut
+  )
+/*++
+
+Routine Description: 
+
+  Get this file's information
+
+Arguments:  
+
+  Handle   - in NT32 mode Directory handle, in other mode File Handle
+  FileName - The file name
+  InfoOut  - parameter to pass file information out
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+  EFI_LOAD_ERROR
+
+--*/
+{
+
+  VOID        *Info;
+  UINTN       Size;
+  EFI_STATUS  Status;
+
+  Size  = SIZE_OF_EFI_FILE_INFO + 1024;
+  Info  = AllocateZeroPool (Size);
+  if (!Info) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  //
+  // get file information
+  //
+  Status = Handle->GetInfo (Handle, &gEfiFileInfoGuid, &Size, Info);
+  if (EFI_ERROR (Status)) {
+    return EFI_LOAD_ERROR;
+  }
+
+  *InfoOut = (EFI_FILE_INFO *) Info;
+
+  return EFI_SUCCESS;
+
+}
+
+EFI_STATUS
+HFileImageRead (
+  IN CONST CHAR16  *FileName,
+  IN BOOLEAN Recover
+  )
+/*++
+
+Routine Description: 
+
+  Read a file from disk into HBufferImage
+
+Arguments:  
+
+  FileName -- filename to read
+  Recover -- if is for recover, no information print
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+  EFI_OUT_OF_RESOURCES
+  
+--*/
+{
+  HEFI_EDITOR_LINE                *Line;
+  UINT8                           *Buffer;
+  CHAR16                          *UnicodeBuffer;
+  EFI_STATUS                      Status;
+
+  //
+  // variable initialization
+  //
+  Line                    = NULL;
+
+  //
+  // in this function, when you return error ( except EFI_OUT_OF_RESOURCES )
+  // you should set status string
+  // since this function maybe called before the editorhandleinput loop
+  // so any error will cause editor return
+  // so if you want to print the error status
+  // you should set the status string
+  //
+  Status = ReadFileIntoBuffer (FileName, (VOID**)&Buffer, &HFileImage.Size, &HFileImage.ReadOnly);
+  if (EFI_ERROR(Status)) {
+    UnicodeBuffer = CatSPrint(NULL, L"Read error on file &s: %r", FileName, Status);
+    if (UnicodeBuffer == NULL) {
+      SHELL_FREE_NON_NULL(Buffer);
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    StatusBarSetStatusString (UnicodeBuffer);
+    FreePool (UnicodeBuffer);
+  }
+
+  HFileImageSetFileName (FileName);
+
+  //
+  // free the old lines
+  //
+  HBufferImageFree ();
+
+  Status = HBufferImageBufferToList (Buffer, HFileImage.Size);
+  SHELL_FREE_NON_NULL (Buffer);
+  if (EFI_ERROR (Status)) {
+    StatusBarSetStatusString (L"Error parsing file.");
+    return Status;
+  }
+
+  HBufferImage.DisplayPosition.Row    = 2;
+  HBufferImage.DisplayPosition.Column = 10;
+  HBufferImage.MousePosition.Row      = 2;
+  HBufferImage.MousePosition.Column   = 10;
+  HBufferImage.LowVisibleRow          = 1;
+  HBufferImage.HighBits               = TRUE;
+  HBufferImage.BufferPosition.Row     = 1;
+  HBufferImage.BufferPosition.Column  = 1;
+
+  if (!Recover) {
+    UnicodeBuffer = CatSPrint(NULL, L"%d Lines Read", HBufferImage.NumLines);
+    if (UnicodeBuffer == NULL) {
+      SHELL_FREE_NON_NULL(Buffer);
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    StatusBarSetStatusString (UnicodeBuffer);
+    FreePool (UnicodeBuffer);
+
+    HMainEditor.SelectStart = 0;
+    HMainEditor.SelectEnd   = 0;
+  }
+
+  //
+  // has line
+  //
+  if (HBufferImage.Lines != 0) {
+    HBufferImage.CurrentLine = CR (HBufferImage.ListHead->ForwardLink, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+  } else {
+    //
+    // create a dummy line
+    //
+    Line = HBufferImageCreateLine ();
+    if (Line == NULL) {
+      SHELL_FREE_NON_NULL(Buffer);
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    HBufferImage.CurrentLine = Line;
+  }
+
+  HBufferImage.Modified           = FALSE;
+  HBufferImageNeedRefresh         = TRUE;
+  HBufferImageOnlyLineNeedRefresh = FALSE;
+  HBufferImageMouseNeedRefresh    = TRUE;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HFileImageSave (
+  IN CHAR16 *FileName
+  )
+/*++
+
+Routine Description: 
+
+  Save lines in HBufferImage to disk
+
+Arguments:  
+
+  FileName - The file name
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+
+  LIST_ENTRY                      *Link;
+  HEFI_EDITOR_LINE                *Line;
+  CHAR16                          *Str;
+  EFI_STATUS                      Status;
+  UINTN                           NumLines;
+  SHELL_FILE_HANDLE                 FileHandle;
+  UINTN                           TotalSize;
+  UINT8                           *Buffer;
+  UINT8                           *Ptr;
+  EDIT_FILE_TYPE                  BufferTypeBackup;
+
+  BufferTypeBackup        = HBufferImage.BufferType;
+  HBufferImage.BufferType = FileTypeFileBuffer;
+
+  //
+  // if is the old file
+  //
+  if (StrCmp (FileName, HFileImage.FileName) == 0) {
+    //
+    // check whether file exists on disk
+    //
+    if (ShellIsFile(FileName) == EFI_SUCCESS) {
+      //
+      // current file exists on disk
+      // so if not modified, then not save
+      //
+      if (HBufferImage.Modified == FALSE) {
+        return EFI_SUCCESS;
+      }
+      //
+      // if file is read-only, set error
+      //
+      if (HFileImage.ReadOnly == TRUE) {
+        StatusBarSetStatusString (L"Read Only File Can Not Be Saved");
+        return EFI_SUCCESS;
+      }
+    }
+  }
+
+   if (ShellIsDirectory(FileName) == EFI_SUCCESS) {
+    StatusBarSetStatusString (L"Directory Can Not Be Saved");
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = ShellOpenFileByName (FileName, &FileHandle, EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE, 0);
+
+  if (!EFI_ERROR (Status)) {
+    //
+    // the file exits, delete it
+    //
+    Status = ShellDeleteFile (&FileHandle);
+    if (EFI_ERROR (Status) || Status == EFI_WARN_DELETE_FAILURE) {
+      StatusBarSetStatusString (L"Write File Failed");
+      return EFI_LOAD_ERROR;
+    }
+ }
+
+  //
+  // write all the lines back to disk
+  //
+  NumLines  = 0;
+  TotalSize = 0;
+  for (Link = HBufferImage.ListHead->ForwardLink; Link != HBufferImage.ListHead; Link = Link->ForwardLink) {
+    Line = CR (Link, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+
+    if (Line->Size != 0) {
+      TotalSize += Line->Size;
+    }
+    //
+    // end of if Line -> Size != 0
+    //
+    NumLines++;
+  }
+  //
+  // end of for Link
+  //
+  Buffer = AllocateZeroPool (TotalSize);
+  if (Buffer == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  Ptr = Buffer;
+  for (Link = HBufferImage.ListHead->ForwardLink; Link != HBufferImage.ListHead; Link = Link->ForwardLink) {
+    Line = CR (Link, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+
+    if (Line->Size != 0) {
+      CopyMem (Ptr, Line->Buffer, Line->Size);
+      Ptr += Line->Size;
+    }
+    //
+    // end of if Line -> Size != 0
+    //
+  }
+
+
+  Status = ShellOpenFileByName (FileName, &FileHandle, EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE|EFI_FILE_MODE_CREATE, 0);
+
+  if (EFI_ERROR (Status)) {
+    StatusBarSetStatusString (L"Create File Failed");
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = ShellWriteFile (FileHandle, &TotalSize, Buffer);
+  FreePool (Buffer);
+  if (EFI_ERROR (Status)) {
+    ShellDeleteFile (&FileHandle);
+    return EFI_LOAD_ERROR;
+  }
+
+  ShellCloseFile(&FileHandle);
+
+  HBufferImage.Modified = FALSE;
+
+  //
+  // set status string
+  //
+  Str = CatSPrint(NULL, L"%d Lines Wrote", NumLines);
+  StatusBarSetStatusString (Str);
+  FreePool (Str);
+
+  //
+  // now everything is ready , you can set the new file name to filebuffer
+  //
+  if (BufferTypeBackup != FileTypeFileBuffer || StringNoCaseCompare (&FileName, &HFileImage.FileName) != 0) {
+    //
+    // not the same
+    //
+    HFileImageSetFileName (FileName);
+    if (HFileImage.FileName == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+  }
+
+  HFileImage.ReadOnly = FALSE;
+
+  return EFI_SUCCESS;
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/FileImage.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/FileImage.h
new file mode 100644
index 0000000000..ae386d2fc9
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/FileImage.h
@@ -0,0 +1,56 @@
+/** @file
+  Defines FileImage - the view of the file that is visible at any point, 
+  as well as the event handlers for editing the file
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_FILE_IMAGE_H_
+#define _LIB_FILE_IMAGE_H_
+
+#include "HexEditor.h"
+
+EFI_STATUS
+HFileImageInit (
+  VOID
+  );
+EFI_STATUS
+HFileImageCleanup (
+  VOID
+  );
+EFI_STATUS
+HFileImageBackup (
+  VOID
+  );
+
+EFI_STATUS
+HFileImageSetFileName (
+  IN CONST CHAR16 *
+  );
+
+EFI_STATUS
+HFileImageGetFileInfo (
+  EFI_FILE_HANDLE,
+  CHAR16          *,
+  EFI_FILE_INFO   **
+  );
+
+EFI_STATUS
+HFileImageRead (
+  IN CONST CHAR16   *,
+  IN          BOOLEAN
+  );
+EFI_STATUS
+HFileImageSave (
+  IN CHAR16 *
+  );
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexEdit.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexEdit.c
new file mode 100644
index 0000000000..511eb9e636
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexEdit.c
@@ -0,0 +1,247 @@
+/** @file
+  Main entry point of editor
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "UefiShellDebug1CommandsLib.h"
+#include "HexEditor.h"
+
+//
+// Global Variables
+//
+STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
+  {L"-f", TypeFlag},
+  {L"-d", TypeFlag},
+  {L"-m", TypeFlag},
+  {NULL, TypeMax}
+  };
+
+/**
+  Function for 'hexedit' command.
+
+  @param[in] ImageHandle  Handle to the Image (NULL if Internal).
+  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
+**/
+SHELL_STATUS
+EFIAPI
+ShellCommandRunHexEdit (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS              Status;
+  CHAR16                  *Buffer;
+  CHAR16                  *ProblemParam;
+  SHELL_STATUS            ShellStatus;
+  LIST_ENTRY              *Package;
+  CONST CHAR16            *Cwd;
+  CHAR16                  *NFS;
+  CHAR16                  *Spot;
+  CONST CHAR16            *Name;
+  UINTN                   Offset;
+  UINTN                   Size;
+  UINT64                  LastOffset;
+  EDIT_FILE_TYPE          WhatToDo;
+
+  Buffer      = NULL;
+  ShellStatus = SHELL_SUCCESS;
+  NFS         = NULL;
+  Cwd         = NULL;
+  Buffer      = NULL;
+  Name        = NULL;
+  Spot        = NULL;
+  Offset      = 0;
+  Size        = 0;
+  LastOffset  = 0;
+  WhatToDo    = FileTypeNone;
+
+  //
+  // initialize the shell lib (we must be in non-auto-init...)
+  //
+  Status = ShellInitialize();
+  ASSERT_EFI_ERROR(Status);
+
+  Status = CommandInit();
+  ASSERT_EFI_ERROR(Status);
+
+  //
+  // parse the command line
+  //
+  Status = ShellCommandLineParse (ParamList, &Package, &ProblemParam, TRUE);
+  if (EFI_ERROR(Status)) {
+    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
+      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellDebug1HiiHandle, ProblemParam);
+      FreePool(ProblemParam);
+      ShellStatus = SHELL_INVALID_PARAMETER;
+    } else {
+      ASSERT(FALSE);
+    }
+  } else {
+    //
+    // Check for -d
+    //
+    if (ShellCommandLineGetFlag(Package, L"-d")){
+      if (ShellCommandLineGetCount(Package) < 4) {
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellDebug1HiiHandle);
+        ShellStatus = SHELL_INVALID_PARAMETER;
+      } else if (ShellCommandLineGetCount(Package) > 4) {
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellDebug1HiiHandle);
+        ShellStatus = SHELL_INVALID_PARAMETER;
+      } else {
+        WhatToDo = FileTypeDiskBuffer;
+        Name    = ShellCommandLineGetRawValue(Package, 1);
+        Offset  = ShellStrToUintn(ShellCommandLineGetRawValue(Package, 2));
+        Size    = ShellStrToUintn(ShellCommandLineGetRawValue(Package, 3));
+      }
+    }
+
+    //
+    // check for -f
+    //
+    if (ShellCommandLineGetFlag(Package, L"-f") && (WhatToDo == FileTypeNone)){
+      if (ShellCommandLineGetCount(Package) > 2) {
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellDebug1HiiHandle);
+        ShellStatus = SHELL_INVALID_PARAMETER;
+      } else {
+        Name      = ShellCommandLineGetRawValue(Package, 1);
+        if (!IsValidFileName(Name)) {
+          ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellDebug1HiiHandle, Name);
+          ShellStatus = SHELL_INVALID_PARAMETER;
+        } else {
+          WhatToDo  = FileTypeFileBuffer;
+        }
+      }
+    }
+
+    //
+    // check for -m
+    //
+    if (ShellCommandLineGetFlag(Package, L"-m") && (WhatToDo == FileTypeNone)){
+      if (ShellCommandLineGetCount(Package) < 3) {
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellDebug1HiiHandle);
+        ShellStatus = SHELL_INVALID_PARAMETER;
+      } else if (ShellCommandLineGetCount(Package) > 3) {
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellDebug1HiiHandle);
+        ShellStatus = SHELL_INVALID_PARAMETER;
+      } else {
+        WhatToDo = FileTypeMemBuffer;
+        Offset  = ShellStrToUintn(ShellCommandLineGetRawValue(Package, 1));
+        Size    = ShellStrToUintn(ShellCommandLineGetRawValue(Package, 2));
+      }
+    }
+    ShellCommandLineFreeVarList (Package);
+
+    if (ShellStatus == SHELL_SUCCESS && WhatToDo == FileTypeNone) {
+      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellDebug1HiiHandle);
+      ShellStatus = SHELL_INVALID_PARAMETER;
+    }
+
+    if (ShellStatus == SHELL_SUCCESS) {
+      //
+      // Do the editor
+      //
+      Status = HMainEditorInit ();
+      if (EFI_ERROR (Status)) {
+        gST->ConOut->ClearScreen (gST->ConOut);
+        gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_INIT_FAILED), gShellDebug1HiiHandle);
+      } else {
+        HMainEditorBackup ();
+        switch (WhatToDo) {
+        case FileTypeFileBuffer:
+          Status = HBufferImageRead (
+                    Name,
+                    NULL,
+                    0,
+                    0,
+                    0,
+                    0,
+                    FileTypeFileBuffer,
+                    FALSE
+                    );
+          break;
+
+        case FileTypeDiskBuffer:
+          Status = HBufferImageRead (
+                    NULL,
+                    Name,
+                    Offset,
+                    Size,
+                    0,
+                    0,
+                    FileTypeDiskBuffer,
+                    FALSE
+                    );
+          break;
+
+        case FileTypeMemBuffer:
+          Status = HBufferImageRead (
+                    NULL,
+                    NULL,
+                    0,
+                    0,
+                    (UINT32) Offset,
+                    Size,
+                    FileTypeMemBuffer,
+                    FALSE
+                    );
+          break;
+
+        }
+        if (!EFI_ERROR (Status)) {
+          HMainEditorRefresh ();
+          Status = HMainEditorKeyInput ();
+        }
+        if (Status != EFI_OUT_OF_RESOURCES) {
+          //
+          // back up the status string
+          //
+          Buffer = CatSPrint (NULL, L"%s", StatusBarGetString());
+        }
+      }
+
+      //
+      // cleanup
+      //
+      HMainEditorCleanup ();
+
+      if (!EFI_ERROR (Status)) {
+        if (ShellStatus == SHELL_SUCCESS) {
+          ShellStatus = SHELL_UNSUPPORTED;
+        }
+      }
+
+      //
+      // print editor exit code on screen
+      //
+      if (Status == EFI_OUT_OF_RESOURCES) {
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_OUT_MEM), gShellDebug1HiiHandle);
+      } else if (EFI_ERROR(Status)){
+        if (Buffer != NULL) {
+          if (StrCmp (Buffer, L"") != 0) {
+            //
+            // print out the status string
+            //
+            ShellPrintEx(-1, -1, L"%s", gShellDebug1HiiHandle, Buffer);
+          } else {
+            ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_UNKNOWN_EDITOR), gShellDebug1HiiHandle);
+          }
+        } else {
+          ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_UNKNOWN_EDITOR), gShellDebug1HiiHandle);
+        }
+      }
+    }
+  }
+
+  SHELL_FREE_NON_NULL (Buffer);
+  return ShellStatus;
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexEditor.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexEditor.h
new file mode 100644
index 0000000000..d0a4bf4aae
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexEditor.h
@@ -0,0 +1,41 @@
+/** @file
+  Main include file for hex editor
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _EFI_SHELL_HEXEDIT_H_
+#define _EFI_SHELL_HEXEDIT_H_
+
+#include "UefiShellDebug1CommandsLib.h"
+#include "HexEditorTypes.h"
+
+#include "MainHexEditor.h"
+
+#include "BufferImage.h"
+#include "FileImage.h"
+#include "DiskImage.h"
+#include "MemImage.h"
+
+#include "EditTitleBar.h"
+#include "EditStatusBar.h"
+#include "EditInputBar.h"
+#include "EditMenuBar.h"
+
+#include "Misc.h"
+
+#include "Clipboard.h"
+
+extern HEFI_EDITOR_GLOBAL_EDITOR  HMainEditor;
+extern BOOLEAN                    HEditorFirst;
+extern BOOLEAN                    HEditorExit;
+
+#endif // _HEDITOR_H
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexEditorTypes.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexEditorTypes.h
new file mode 100644
index 0000000000..51c9f44cd5
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexEditorTypes.h
@@ -0,0 +1,132 @@
+/** @file
+  data types that are used by editor
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _HEDITOR_TYPE_H_
+#define _HEDITOR_TYPE_H_
+
+#include "UefiShellDebug1CommandsLib.h"
+#include "EditTitleBar.h"
+
+#define EFI_EDITOR_LINE_LIST  'eell'
+
+#define ASCII_POSITION        ((0x10 * 3) + 12)
+
+
+typedef struct {
+  UINTN Row;
+  UINTN Column;
+} HEFI_EDITOR_POSITION;
+
+typedef
+EFI_STATUS
+(*HEFI_MENU_ITEM_FUNCTION) (
+  VOID
+  );
+
+typedef struct {
+  CHAR16                  Name[50];
+  CHAR16                  Key[3];
+  HEFI_MENU_ITEM_FUNCTION Function;
+} HMENU_ITEMS;
+
+typedef struct _HEFI_EDITOR_LINE {
+  UINTN           Signature;
+  UINT8           Buffer[0x10];
+  UINTN           Size;                             // unit is Unicode
+  LIST_ENTRY  Link;
+} HEFI_EDITOR_LINE;
+
+typedef struct _HEFI_EDITOR_MENU_ITEM {
+  CHAR16                  NameToken;
+  CHAR16                  FunctionKeyToken;
+  HEFI_MENU_ITEM_FUNCTION Function;
+} HEFI_EDITOR_MENU_ITEM;
+
+typedef struct {
+  UINT32  Foreground : 4;
+  UINT32  Background : 4;
+} HEFI_EDITOR_COLOR_ATTRIBUTES;
+
+typedef union {
+  HEFI_EDITOR_COLOR_ATTRIBUTES  Colors;
+  UINT8                         Data;
+} HEFI_EDITOR_COLOR_UNION;
+
+typedef struct {
+  UINTN Columns;
+  UINTN Rows;
+} HEFI_EDITOR_TEXT_MODE;
+
+
+typedef struct {
+  CHAR16  *Name;
+
+  UINTN   BlockSize;
+  UINTN   Size;
+  UINTN   Offset;
+} HEFI_EDITOR_DISK_IMAGE;
+
+typedef struct {
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *IoFncs;
+
+  UINTN                           Offset;
+  UINTN                           Size;
+} HEFI_EDITOR_MEM_IMAGE;
+
+typedef struct {
+  CHAR16  *FileName;
+  UINTN   Size;                                     // file size
+  BOOLEAN ReadOnly;                                 // file is read-only or not
+} HEFI_EDITOR_FILE_IMAGE;
+
+typedef struct {
+  LIST_ENTRY                      *ListHead;        // list head of lines
+  HEFI_EDITOR_LINE                *Lines;           // lines of current file
+  UINTN                           NumLines;         // number of lines
+  HEFI_EDITOR_LINE                *CurrentLine;     // current line cursor is at
+  HEFI_EDITOR_POSITION            DisplayPosition;  // cursor position in screen
+  HEFI_EDITOR_POSITION            MousePosition;    // mouse position in screen
+  HEFI_EDITOR_POSITION            BufferPosition;   // cursor position in buffer
+  UINTN                           LowVisibleRow;    // the lowest visible row of file position
+  BOOLEAN                         HighBits;         // cursor is at the high4 bits or low4 bits
+  BOOLEAN                         Modified;         // BUFFER is modified or not
+  EDIT_FILE_TYPE                  BufferType;
+
+  HEFI_EDITOR_FILE_IMAGE          *FileImage;
+  HEFI_EDITOR_DISK_IMAGE          *DiskImage;
+  HEFI_EDITOR_MEM_IMAGE           *MemImage;
+
+} HEFI_EDITOR_BUFFER_IMAGE;
+
+typedef struct {
+  UINT8 *Buffer;
+  UINTN Size;
+} HEFI_EDITOR_CLIPBOARD;
+
+typedef struct {
+  HEFI_EDITOR_BUFFER_IMAGE    *BufferImage;
+  HEFI_EDITOR_CLIPBOARD       *Clipboard;
+
+  HEFI_EDITOR_COLOR_UNION     ColorAttributes;
+  HEFI_EDITOR_POSITION        ScreenSize;           // row number and column number
+  BOOLEAN                     MouseSupported;
+  EFI_SIMPLE_POINTER_PROTOCOL *MouseInterface;
+  INT32                       MouseAccumulatorX;
+  INT32                       MouseAccumulatorY;
+
+  UINTN                       SelectStart;          // starting from 1
+  UINTN                       SelectEnd;            // starting from 1
+} HEFI_EDITOR_GLOBAL_EDITOR;
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexeditStrings.uni b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexeditStrings.uni
new file mode 100644
index 0000000000..3389444f62
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/HexeditStrings.uni
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MainHexEditor.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MainHexEditor.c
new file mode 100644
index 0000000000..387a1e2d1e
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MainHexEditor.c
@@ -0,0 +1,2294 @@
+/** @file
+    Defines the Main Editor data type - 
+     - Global variables 
+     - Instances of the other objects of the editor
+     - Main Interfaces
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "HexEditor.h"
+#include "EditStatusBar.h"
+#include "EditInputBar.h"
+
+HEFI_EDITOR_COLOR_ATTRIBUTES    HOriginalColors;
+INTN                            HOriginalMode;
+
+//
+// the first time editor launch
+//
+BOOLEAN                         HEditorFirst;
+
+//
+// it's time editor should exit
+//
+BOOLEAN                         HEditorExit;
+
+BOOLEAN                         HEditorMouseAction;
+
+extern HEFI_EDITOR_BUFFER_IMAGE HBufferImage;
+extern HEFI_EDITOR_BUFFER_IMAGE HBufferImageBackupVar;
+
+extern HEFI_EDITOR_CLIPBOARD    HClipBoard;
+
+extern BOOLEAN                  HBufferImageMouseNeedRefresh;
+extern BOOLEAN                  HBufferImageNeedRefresh;
+extern BOOLEAN                  HBufferImageOnlyLineNeedRefresh;
+
+HEFI_EDITOR_GLOBAL_EDITOR       HMainEditor;
+HEFI_EDITOR_GLOBAL_EDITOR       HMainEditorBackupVar;
+
+//
+// basic initialization for MainEditor
+//
+HEFI_EDITOR_GLOBAL_EDITOR       HMainEditorConst = {
+  &HBufferImage,
+  &HClipBoard,
+  {
+    0,
+    0
+  },
+  {
+    0,
+    0
+  },
+  FALSE,
+  NULL,
+  0,
+  0,
+  1,
+  1
+};
+
+EFI_STATUS
+HMainCommandGoToOffset (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  move cursor to specified lines
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  UINTN       Size;
+  UINT64      Offset;
+  EFI_STATUS  Status;
+  UINTN       FRow;
+  UINTN       FCol;
+
+  //
+  // variable initialization
+  //
+  Size    = 0;
+  Offset  = 0;
+  FRow    = 0;
+  FCol    = 0;
+
+  //
+  // get offset
+  //
+  Status = InputBarSetPrompt (L"Go To Offset: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (8);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  while (1) {
+    Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+    //
+    // ESC pressed
+    //
+    if (Status == EFI_NOT_READY) {
+
+      return EFI_SUCCESS;
+    }
+    //
+    // THE input string length should > 0
+    //
+    if (StrLen (InputBarGetString()) > 0) {
+      Status = ShellConvertStringToUint64 (InputBarGetString(), &Offset, TRUE, FALSE);
+      if (EFI_ERROR (Status)) {
+        StatusBarSetStatusString (L"Invalid Offset");
+        return EFI_SUCCESS;
+      }
+
+      break;
+    }
+  }
+
+  Size = HBufferImageGetTotalSize ();
+  if (Offset >= Size) {
+    StatusBarSetStatusString (L"Invalid Offset");
+    return EFI_SUCCESS;
+  }
+
+  FRow  = (UINTN)DivU64x32(Offset , 0x10) + 1;
+  FCol  = (UINTN)ModU64x32(Offset , 0x10) + 1;
+
+  HBufferImageMovePosition (FRow, FCol, TRUE);
+
+  HBufferImageNeedRefresh         = TRUE;
+  HBufferImageOnlyLineNeedRefresh = FALSE;
+  HBufferImageMouseNeedRefresh    = TRUE;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMainCommandSaveBuffer (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  save current opened buffer . 
+  if is file buffer, you can save to current file name or 
+  save to another file name
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+  EFI_LOAD_ERROR
+
+--*/
+{
+  EFI_STATUS          Status;
+  BOOLEAN             Done;
+  CHAR16              *FileName;
+  BOOLEAN             OldFile;
+  CHAR16              *Str;
+  EFI_FILE_INFO       *Info;
+  SHELL_FILE_HANDLE   ShellFileHandle;
+
+  if (HMainEditor.BufferImage->BufferType != FileTypeFileBuffer) {
+    if (HMainEditor.BufferImage->Modified == FALSE) {
+      return EFI_SUCCESS;
+    }
+
+    Status = InputBarSetPrompt (L"Dangerous to save disk/mem buffer. Save (Yes/No/Cancel) ? ");
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // the answer is just one character
+    //
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // loop for user's answer
+    // valid answer is just 'y' 'Y', 'n' 'N', 'c' 'C'
+    //
+    while (1) {
+      Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        //
+        // want to save this buffer first
+        //
+        Status = HBufferImageSave (
+                  NULL,
+                  HMainEditor.BufferImage->DiskImage->Name,
+                  HMainEditor.BufferImage->DiskImage->Offset,
+                  HMainEditor.BufferImage->DiskImage->Size,
+                  HMainEditor.BufferImage->MemImage->Offset,
+                  HMainEditor.BufferImage->MemImage->Size,
+                  HMainEditor.BufferImage->BufferType
+                  );
+
+        if (EFI_ERROR (Status)) {
+          StatusBarSetStatusString (L"BufferSave: Problems Writing");
+          return Status;
+        }
+
+        return EFI_SUCCESS;
+
+      case L'n':
+      case L'N':
+        //
+        // the file won't be saved
+        //
+        return EFI_SUCCESS;
+        break;
+
+      case L'c':
+      case L'C':
+        return EFI_SUCCESS;
+      }
+      //
+      // end of switch
+      //
+    }
+    //
+    // ENDOF WHILE
+    //
+  }
+  //
+  // ENDOF != FILEBUFFER
+  //
+  // This command will save currently opened file to disk.
+  // You can choose save to another file name or just save to
+  // current file name.
+  // Below is the scenario of Save File command: (
+  //    Suppose the old file name is A )
+  // 1. An Input Bar will be prompted:    "File To Save: [ old file name]"
+  //    IF user press ESC, Save File command ends .
+  //    IF user press Enter, input file name will be A.
+  //    IF user inputs a new file name B,  input file name will be B.
+  //
+  // 2. IF input file name is A, go to do Step 3.
+  //    IF input file name is B, go to do Step 4.
+  //
+  // 3. IF A is read only, Status Bar will show "Access Denied"
+  //       and Save File commands ends.
+  //    IF A is not read only, save file buffer to disk
+  //       and remove Modified flag in Title Bar , then Save File command ends.
+  //
+  // 4. IF B does not exist, create this file and save file buffer to it.
+  //       Go to do Step 7.
+  //    IF B exits, do Step 5.
+  //
+  // 5. An Input Bar will be prompted:
+  //       "File Exists. Overwrite ( Yes/No/Cancel ) ?"
+  //      IF user press 'y' or 'Y', do Step 6.
+  //      IF user press 'n' or 'N', Save File commands ends.
+  //      IF user press 'c' or 'C' or ESC, Save File commands ends.
+  //
+  // 6. IF B is a read-only file, Status Bar will show "Access Denied"
+  //       and Save File commands ends.
+  //    IF B can be read and write, save file buffer to B.
+  //
+  // 7. Update File Name field in Title Bar to B
+  //       and remove the Modified flag in Title Bar.
+  //
+  Str = CatSPrint(NULL, 
+          L"File to Save: [%s]",
+          HMainEditor.BufferImage->FileImage->FileName
+          );
+  if (Str == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  if (StrLen (Str) >= 50) {
+    //
+    // replace the long file name with "..."
+    //
+    Str[46] = L'.';
+    Str[47] = L'.';
+    Str[48] = L'.';
+    Str[49] = L']';
+    Str[50] = L'\0';
+  }
+
+  Status = InputBarSetPrompt (Str);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (100);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+  //
+  // get new file name
+  //
+  Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+  //
+  // if user pressed ESC
+  //
+  if (Status == EFI_NOT_READY) {
+    SHELL_FREE_NON_NULL (Str);
+    return EFI_SUCCESS;
+  }
+
+  SHELL_FREE_NON_NULL (Str);
+
+  //
+  // if just enter pressed, so think save to current file name
+  //
+  if (StrLen (InputBarGetString()) == 0) {
+    FileName = CatSPrint(NULL, 
+                L"%s",
+                HMainEditor.BufferImage->FileImage->FileName
+                );
+  } else {
+    FileName = CatSPrint(NULL, L"%s", InputBarGetString());
+  }
+
+  if (FileName == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  if (!IsValidFileName (FileName)) {
+    StatusBarSetStatusString (L"Invalid File Name");
+    SHELL_FREE_NON_NULL (FileName);
+    return EFI_SUCCESS;
+  }
+
+  OldFile = FALSE;
+
+  //
+  // save to the old file
+  //
+  if (StringNoCaseCompare (
+        &FileName,
+        &HMainEditor.BufferImage->FileImage->FileName
+        ) == 0) {
+    OldFile = TRUE;
+  }
+
+  if (OldFile) {
+    //
+    // if the file is read only, so can not write back to it.
+    //
+    if (HMainEditor.BufferImage->FileImage->ReadOnly == TRUE) {
+      StatusBarSetStatusString (L"Access Denied");
+      SHELL_FREE_NON_NULL (FileName);
+      return EFI_SUCCESS;
+    }
+  } else {
+    Status = ShellOpenFileByName (FileName, &ShellFileHandle, EFI_FILE_MODE_READ, 0);
+
+    if (!EFI_ERROR (Status)) {
+
+      Info = ShellGetFileInfo(ShellFileHandle);
+
+      ShellCloseFile(&ShellFileHandle);
+      //
+      // check if read only
+      //
+      if (Info->Attribute & EFI_FILE_READ_ONLY) {
+        StatusBarSetStatusString (L"Access Denied");
+        SHELL_FREE_NON_NULL (FileName);
+        return EFI_SUCCESS;
+      } 
+
+      SHELL_FREE_NON_NULL(Info);
+      //
+      // ask user whether to overwrite this file
+      //
+      Status = InputBarSetPrompt (L"File exists. Overwrite (Yes/No/Cancel) ? ");
+      if (EFI_ERROR (Status)) {
+        SHELL_FREE_NON_NULL (FileName);
+        return Status;
+      }
+
+      Status = InputBarSetStringSize (1);
+      if (EFI_ERROR (Status)) {
+        SHELL_FREE_NON_NULL (FileName);
+        return Status;
+      }
+
+      Done = FALSE;
+      while (!Done) {
+        Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+        if (Status == EFI_NOT_READY) {
+          SHELL_FREE_NON_NULL (FileName);
+          return EFI_SUCCESS;
+        }
+
+        switch (InputBarGetString()[0]) {
+        case L'y':
+        case L'Y':
+          Done = TRUE;
+          break;
+        case L'n':
+        case L'N':
+          SHELL_FREE_NON_NULL (FileName);
+          return EFI_SUCCESS;
+        case L'c':
+        case L'C':
+          SHELL_FREE_NON_NULL (FileName);
+          return EFI_SUCCESS;
+        } // switch
+      } // while
+    } // if opened existing file
+  } // if OldFile
+  
+  //
+  // save file back to disk
+  //
+  Status = HBufferImageSave (
+            FileName,
+            HMainEditor.BufferImage->DiskImage->Name,
+            HMainEditor.BufferImage->DiskImage->Offset,
+            HMainEditor.BufferImage->DiskImage->Size,
+            HMainEditor.BufferImage->MemImage->Offset,
+            HMainEditor.BufferImage->MemImage->Size,
+            FileTypeFileBuffer
+            );
+  SHELL_FREE_NON_NULL (FileName);
+
+  if (EFI_ERROR (Status)) {
+    return EFI_LOAD_ERROR;
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMainCommandSelectStart (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Load a disk buffer editor
+
+Arguments:  
+
+  None
+
+Returns:  
+
+   EFI_SUCCESS
+   EFI_LOAD_ERROR
+   EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  UINTN Start;
+
+  Start = (HMainEditor.BufferImage->BufferPosition.Row - 1) * 0x10 + HMainEditor.BufferImage->BufferPosition.Column;
+
+  //
+  // last line
+  //
+  if (HMainEditor.BufferImage->CurrentLine->Link.ForwardLink == HMainEditor.BufferImage->ListHead) {
+    if (HMainEditor.BufferImage->BufferPosition.Column > HMainEditor.BufferImage->CurrentLine->Size) {
+      StatusBarSetStatusString (L"Invalid Block Start");
+      return EFI_LOAD_ERROR;
+    }
+  }
+
+  if (HMainEditor.SelectEnd != 0 && Start > HMainEditor.SelectEnd) {
+    StatusBarSetStatusString (L"Invalid Block Start");
+    return EFI_LOAD_ERROR;
+  }
+
+  HMainEditor.SelectStart = Start;
+
+  HBufferImageNeedRefresh = TRUE;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMainCommandSelectEnd (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Load a disk buffer editor
+
+Arguments:  
+
+  None
+
+Returns:  
+
+   EFI_SUCCESS
+   EFI_LOAD_ERROR
+   EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  UINTN End;
+
+  End = (HMainEditor.BufferImage->BufferPosition.Row - 1) * 0x10 + HMainEditor.BufferImage->BufferPosition.Column;
+
+  //
+  // last line
+  //
+  if (HMainEditor.BufferImage->CurrentLine->Link.ForwardLink == HMainEditor.BufferImage->ListHead) {
+    if (HMainEditor.BufferImage->BufferPosition.Column > HMainEditor.BufferImage->CurrentLine->Size) {
+      StatusBarSetStatusString (L"Invalid Block End");
+      return EFI_LOAD_ERROR;
+    }
+  }
+
+  if (HMainEditor.SelectStart != 0 && End < HMainEditor.SelectStart) {
+    StatusBarSetStatusString (L"Invalid Block End");
+    return EFI_SUCCESS;
+  }
+
+  HMainEditor.SelectEnd   = End;
+
+  HBufferImageNeedRefresh = TRUE;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMainCommandCut (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  cut current line to clipboard
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+  EFI_LOAD_ERROR
+
+--*/
+{
+  UINTN             Index;
+  HEFI_EDITOR_LINE  *Line;
+  LIST_ENTRY    *Link;
+  UINT8             *Buffer;
+  UINTN             Count;
+
+  //
+  // not select, so not allowed to cut
+  //
+  if (HMainEditor.SelectStart == 0) {
+    StatusBarSetStatusString (L"No Block is Selected");
+    return EFI_SUCCESS;
+  }
+  //
+  // not select, so not allowed to cut
+  //
+  if (HMainEditor.SelectEnd == 0) {
+    StatusBarSetStatusString (L"No Block is Selected");
+    return EFI_SUCCESS;
+  }
+
+  Link = HMainEditor.BufferImage->ListHead->ForwardLink;
+  for (Index = 0; Index < (HMainEditor.SelectEnd - 1) / 0x10; Index++) {
+    Link = Link->ForwardLink;
+  }
+
+  Line    = CR (Link, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+
+  Count   = HMainEditor.SelectEnd - HMainEditor.SelectStart + 1;
+  Buffer  = AllocateZeroPool (Count);
+  if (Buffer == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  //
+  // cut the selected area
+  //
+  HBufferImageDeleteCharacterFromBuffer (
+    HMainEditor.SelectStart - 1,
+    Count,
+    Buffer
+    );
+
+  //
+  // put to clipboard
+  //
+  HClipBoardSet (Buffer, Count);
+
+  HBufferImageNeedRefresh         = TRUE;
+  HBufferImageOnlyLineNeedRefresh = FALSE;
+
+  if (!HMainEditor.BufferImage->Modified) {
+    HMainEditor.BufferImage->Modified = TRUE;
+  }
+
+  //
+  // now no select area
+  //
+  HMainEditor.SelectStart = 0;
+  HMainEditor.SelectEnd   = 0;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMainCommandPaste (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  paste line to file buffer
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+  EFI_LOAD_ERROR
+
+
+--*/
+{
+
+  BOOLEAN           OnlyLineRefresh;
+  HEFI_EDITOR_LINE  *Line;
+  UINT8             *Buffer;
+  UINTN             Count;
+  UINTN             FPos;
+
+  Count = HClipBoardGet (&Buffer);
+  if (Count == 0 || Buffer == NULL) {
+    StatusBarSetStatusString (L"Nothing to Paste");
+    return EFI_SUCCESS;
+  }
+
+  Line            = HMainEditor.BufferImage->CurrentLine;
+
+  OnlyLineRefresh = FALSE;
+  if (Line->Link.ForwardLink == HMainEditor.BufferImage->ListHead && Line->Size + Count < 0x10) {
+    //
+    // is at last line, and after paste will not exceed
+    // so only this line need to be refreshed
+    //
+    // if after add, the line is 0x10, then will append a new line
+    // so the whole page will need be refreshed
+    //
+    OnlyLineRefresh = TRUE;
+
+  }
+
+  FPos = 0x10 * (HMainEditor.BufferImage->BufferPosition.Row - 1) + HMainEditor.BufferImage->BufferPosition.Column - 1;
+
+  HBufferImageAddCharacterToBuffer (FPos, Count, Buffer);
+
+  if (OnlyLineRefresh) {
+    HBufferImageNeedRefresh         = FALSE;
+    HBufferImageOnlyLineNeedRefresh = TRUE;
+  } else {
+    HBufferImageNeedRefresh         = TRUE;
+    HBufferImageOnlyLineNeedRefresh = FALSE;
+  }
+
+  if (!HMainEditor.BufferImage->Modified) {
+    HMainEditor.BufferImage->Modified = TRUE;
+  }
+
+  return EFI_SUCCESS;
+
+}
+
+EFI_STATUS
+HMainCommandExit (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  exit editor
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+  EFI_LOAD_ERROR
+
+--*/
+{
+  EFI_STATUS  Status;
+
+  //
+  // Below is the scenario of Exit command:
+  // 1. IF currently opened file is not modified, exit the editor and
+  //       Exit command ends.
+  //    IF currently opened file is modified, do Step 2
+  //
+  // 2. An Input Bar will be prompted:
+  //       "File modified. Save ( Yes/No/Cancel )?"
+  //      IF user press 'y' or 'Y', currently opened file will be saved and
+  //         Editor exits
+  //      IF user press 'n' or 'N', currently opened file will not be saved
+  //         and Editor exits.
+  //      IF user press 'c' or 'C' or ESC, Exit command ends.
+  //
+  //
+  // if file has been modified, so will prompt user
+  //       whether to save the changes
+  //
+  if (HMainEditor.BufferImage->Modified) {
+
+    Status = InputBarSetPrompt (L"Buffer modified. Save (Yes/No/Cancel) ? ");
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+
+    while (1) {
+      Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        //
+        // write file back to disk
+        //
+        Status = HBufferImageSave (
+                  HMainEditor.BufferImage->FileImage->FileName,
+                  HMainEditor.BufferImage->DiskImage->Name,
+                  HMainEditor.BufferImage->DiskImage->Offset,
+                  HMainEditor.BufferImage->DiskImage->Size,
+                  HMainEditor.BufferImage->MemImage->Offset,
+                  HMainEditor.BufferImage->MemImage->Size,
+                  HMainEditor.BufferImage->BufferType
+                  );
+        if (!EFI_ERROR (Status)) {
+          HEditorExit = TRUE;
+        }
+
+        return Status;
+
+      case L'n':
+      case L'N':
+        HEditorExit = TRUE;
+        return EFI_SUCCESS;
+
+      case L'c':
+      case L'C':
+        return EFI_SUCCESS;
+
+      }
+    }
+  }
+
+  HEditorExit = TRUE;
+  return EFI_SUCCESS;
+
+}
+
+EFI_STATUS
+HMainCommandOpenFile (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Load a file from disk to editor
+
+Arguments:  
+
+  None
+
+Returns:  
+
+   EFI_SUCCESS
+   EFI_LOAD_ERROR
+   EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  BOOLEAN                         Done;
+  EFI_STATUS                      Status;
+  EDIT_FILE_TYPE                  BufferType;
+
+  BufferType = HMainEditor.BufferImage->BufferType;
+
+  //
+  //  This command will open a file from current working directory.
+  //  Read-only file can also be opened. But it can not be modified.
+  // Below is the scenario of Open File command:
+  // 1. IF currently opened file has not been modified, directly go to step .
+  //  IF currently opened file has been modified, an Input Bar will be
+  //     prompted as :
+  //      "File Modified. Save ( Yes/No/Cancel) ?"
+  //          IF user press 'y' or 'Y', currently opened file will be saved.
+  //          IF user press 'n' or 'N', currently opened file will
+  //             not be saved.
+  //          IF user press 'c' or 'C' or ESC, Open File command ends and
+  //             currently opened file is still opened.
+  //
+  // 2. An Input Bar will be prompted as :  "File Name to Open: "
+  //      IF user press ESC, Open File command ends and
+  //         currently opened file is still opened.
+  //      Any other inputs with a Return will cause
+  //          currently opened file close.
+  //
+  // 3. IF user input file name is an existing file ,
+  //       this file will be read and opened.
+  //    IF user input file name is a new file, this file will be created
+  //       and opened. This file's type ( UNICODE or ASCII ) is the same with
+  //       the old file.
+  //
+  //
+  // if current file is modified, so you need to choose whether to
+  //    save it first.
+  //
+  if (HMainEditor.BufferImage->Modified) {
+
+    Status = InputBarSetPrompt (L"Buffer modified. Save (Yes/No/Cancel) ? ");
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // the answer is just one character
+    //
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // loop for user's answer
+    // valid answer is just 'y' 'Y', 'n' 'N', 'c' 'C'
+    //
+    Done = FALSE;
+    while (!Done) {
+      Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        //
+        // want to save this buffer first
+        //
+        Status = HBufferImageSave (
+                  HMainEditor.BufferImage->FileImage->FileName,
+                  HMainEditor.BufferImage->DiskImage->Name,
+                  HMainEditor.BufferImage->DiskImage->Offset,
+                  HMainEditor.BufferImage->DiskImage->Size,
+                  HMainEditor.BufferImage->MemImage->Offset,
+                  HMainEditor.BufferImage->MemImage->Size,
+                  HMainEditor.BufferImage->BufferType
+                  );
+        if (EFI_ERROR (Status)) {
+          return Status;
+        }
+
+        MainTitleBarRefresh (
+          HMainEditor.BufferImage->BufferType == FileTypeFileBuffer?HMainEditor.BufferImage->FileImage->FileName:HMainEditor.BufferImage->BufferType == FileTypeDiskBuffer?HMainEditor.BufferImage->DiskImage->Name:NULL,
+          HMainEditor.BufferImage->BufferType,
+          HMainEditor.BufferImage->FileImage->ReadOnly,
+          FALSE,
+          HMainEditor.ScreenSize.Column,
+          HMainEditor.ScreenSize.Row
+          );
+        Done = TRUE;
+        break;
+
+      case L'n':
+      case L'N':
+        //
+        // the file won't be saved
+        //
+        Done = TRUE;
+        break;
+
+      case L'c':
+      case L'C':
+        return EFI_SUCCESS;
+      }
+    }
+  }
+  //
+  // TO get the open file name
+  //
+  Status = InputBarSetPrompt (L"File Name to Open: ");
+  if (EFI_ERROR (Status)) {
+    HBufferImageRead (
+      HMainEditor.BufferImage->FileImage->FileName,
+      HMainEditor.BufferImage->DiskImage->Name,
+      HMainEditor.BufferImage->DiskImage->Offset,
+      HMainEditor.BufferImage->DiskImage->Size,
+      HMainEditor.BufferImage->MemImage->Offset,
+      HMainEditor.BufferImage->MemImage->Size,
+      BufferType,
+      TRUE
+      );
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (100);
+  if (EFI_ERROR (Status)) {
+    Status = HBufferImageRead (
+              HMainEditor.BufferImage->FileImage->FileName,
+              HMainEditor.BufferImage->DiskImage->Name,
+              HMainEditor.BufferImage->DiskImage->Offset,
+              HMainEditor.BufferImage->DiskImage->Size,
+              HMainEditor.BufferImage->MemImage->Offset,
+              HMainEditor.BufferImage->MemImage->Size,
+              BufferType,
+              TRUE
+              );
+    return Status;
+  }
+
+  while (1) {
+    Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+    //
+    // ESC pressed
+    //
+    if (Status == EFI_NOT_READY) {
+      Status = HBufferImageRead (
+                HMainEditor.BufferImage->FileImage->FileName,
+                HMainEditor.BufferImage->DiskImage->Name,
+                HMainEditor.BufferImage->DiskImage->Offset,
+                HMainEditor.BufferImage->DiskImage->Size,
+                HMainEditor.BufferImage->MemImage->Offset,
+                HMainEditor.BufferImage->MemImage->Size,
+                BufferType,
+                TRUE
+                );
+
+      return Status;
+    }
+    //
+    // THE input string length should > 0
+    //
+    if (StrLen (InputBarGetString()) > 0) {
+      //
+      // CHECK if filename's valid
+      //
+      if (!IsValidFileName (InputBarGetString())) {
+        HBufferImageRead (
+          HMainEditor.BufferImage->FileImage->FileName,
+          HMainEditor.BufferImage->DiskImage->Name,
+          HMainEditor.BufferImage->DiskImage->Offset,
+          HMainEditor.BufferImage->DiskImage->Size,
+          HMainEditor.BufferImage->MemImage->Offset,
+          HMainEditor.BufferImage->MemImage->Size,
+          BufferType,
+          TRUE
+          );
+
+        StatusBarSetStatusString (L"Invalid File Name");
+        return EFI_SUCCESS;
+      }
+
+      break;
+    }
+  }
+  //
+  // read from disk
+  //
+  Status = HBufferImageRead (
+            InputBarGetString(),
+            HMainEditor.BufferImage->DiskImage->Name,
+            HMainEditor.BufferImage->DiskImage->Offset,
+            HMainEditor.BufferImage->DiskImage->Size,
+            HMainEditor.BufferImage->MemImage->Offset,
+            HMainEditor.BufferImage->MemImage->Size,
+            FileTypeFileBuffer,
+            FALSE
+            );
+
+  if (EFI_ERROR (Status)) {
+    HBufferImageRead (
+      HMainEditor.BufferImage->FileImage->FileName,
+      HMainEditor.BufferImage->DiskImage->Name,
+      HMainEditor.BufferImage->DiskImage->Offset,
+      HMainEditor.BufferImage->DiskImage->Size,
+      HMainEditor.BufferImage->MemImage->Offset,
+      HMainEditor.BufferImage->MemImage->Size,
+      BufferType,
+      TRUE
+      );
+
+    return EFI_LOAD_ERROR;
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMainCommandOpenDisk (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Load a disk buffer editor
+
+Arguments:  
+
+  None
+
+Returns:  
+
+   EFI_SUCCESS
+   EFI_LOAD_ERROR
+   EFI_OUT_OF_RESOURCES
+   EFI_NOT_FOUND
+
+--*/
+{
+  UINT64                          Size;
+  UINT64                          Offset;
+  CHAR16                          *DeviceName;
+  EFI_STATUS                      Status;
+  BOOLEAN                         Done;
+
+  EDIT_FILE_TYPE                  BufferType;
+
+  //
+  // variable initialization
+  //
+  Size        = 0;
+  Offset      = 0;
+  BufferType  = HMainEditor.BufferImage->BufferType;
+
+  //
+  // if current file is modified, so you need to choose
+  // whether to save it first.
+  //
+  if (HMainEditor.BufferImage->Modified) {
+
+    Status = InputBarSetPrompt (L"Buffer modified. Save (Yes/No/Cancel) ? ");
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // the answer is just one character
+    //
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // loop for user's answer
+    // valid answer is just 'y' 'Y', 'n' 'N', 'c' 'C'
+    //
+    Done = FALSE;
+    while (!Done) {
+      Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        //
+        // want to save this buffer first
+        //
+        Status = HBufferImageSave (
+                  HMainEditor.BufferImage->FileImage->FileName,
+                  HMainEditor.BufferImage->DiskImage->Name,
+                  HMainEditor.BufferImage->DiskImage->Offset,
+                  HMainEditor.BufferImage->DiskImage->Size,
+                  HMainEditor.BufferImage->MemImage->Offset,
+                  HMainEditor.BufferImage->MemImage->Size,
+                  BufferType
+                  );
+        if (EFI_ERROR (Status)) {
+          return Status;
+        }
+
+        MainTitleBarRefresh (
+          HMainEditor.BufferImage->BufferType == FileTypeFileBuffer?HMainEditor.BufferImage->FileImage->FileName:HMainEditor.BufferImage->BufferType == FileTypeDiskBuffer?HMainEditor.BufferImage->DiskImage->Name:NULL,
+          HMainEditor.BufferImage->BufferType,
+          HMainEditor.BufferImage->FileImage->ReadOnly,
+          FALSE,
+          HMainEditor.ScreenSize.Column,
+          HMainEditor.ScreenSize.Row
+          );
+        Done = TRUE;
+        break;
+
+      case L'n':
+      case L'N':
+        //
+        // the file won't be saved
+        //
+        Done = TRUE;
+        break;
+
+      case L'c':
+      case L'C':
+        return EFI_SUCCESS;
+      }
+    }
+  }
+  //
+  // get disk block device name
+  //
+  Status = InputBarSetPrompt (L"Block Device to Open: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (100);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  while (1) {
+    Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+    //
+    // ESC pressed
+    //
+    if (Status == EFI_NOT_READY) {
+
+      return EFI_SUCCESS;
+    }
+    //
+    // THE input string length should > 0
+    //
+    if (StrLen (InputBarGetString()) > 0) {
+      break;
+    }
+  }
+
+  DeviceName = CatSPrint(NULL, L"%s", InputBarGetString());
+  if (DeviceName == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  //
+  // get starting offset
+  //
+  Status = InputBarSetPrompt (L"First Block No.: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (16);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  while (1) {
+    Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+    //
+    // ESC pressed
+    //
+    if (Status == EFI_NOT_READY) {
+
+      return EFI_SUCCESS;
+    }
+    //
+    // THE input string length should > 0
+    //
+    if (StrLen (InputBarGetString()) > 0) {
+      Status = ShellConvertStringToUint64 (InputBarGetString(), &Offset, TRUE, FALSE);
+      if (EFI_ERROR (Status)) {
+        continue;
+      }
+
+      break;
+    }
+  }
+  //
+  // get Number of Blocks:
+  //
+  Status = InputBarSetPrompt (L"Number of Blocks: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (8);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  while (1) {
+    Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+    //
+    // ESC pressed
+    //
+    if (Status == EFI_NOT_READY) {
+
+      return EFI_SUCCESS;
+    }
+    //
+    // THE input string length should > 0
+    //
+    if (StrLen (InputBarGetString()) > 0) {
+      Status = ShellConvertStringToUint64 (InputBarGetString(), &Size, TRUE, FALSE);
+      if (EFI_ERROR (Status)) {
+        continue;
+      }
+
+      if (Size == 0) {
+        continue;
+      }
+
+      break;
+    }
+  }
+
+  Status = HBufferImageRead (
+            NULL,
+            DeviceName,
+            (UINTN)Offset,
+            (UINTN)Size,
+            0,
+            0,
+            FileTypeDiskBuffer,
+            FALSE
+            );
+
+  if (EFI_ERROR (Status)) {
+
+    HBufferImageRead (
+      HMainEditor.BufferImage->FileImage->FileName,
+      HMainEditor.BufferImage->DiskImage->Name,
+      HMainEditor.BufferImage->DiskImage->Offset,
+      HMainEditor.BufferImage->DiskImage->Size,
+      HMainEditor.BufferImage->MemImage->Offset,
+      HMainEditor.BufferImage->MemImage->Size,
+      BufferType,
+      TRUE
+      );
+    return EFI_NOT_FOUND;
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMainCommandOpenMemory (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Load memory content to editor
+
+Arguments:  
+
+  None
+
+Returns:  
+
+   EFI_SUCCESS
+   EFI_LOAD_ERROR
+   EFI_OUT_OF_RESOURCES
+   EFI_NOT_FOUND
+
+--*/
+{
+  UINT64                          Size;
+  UINT64                          Offset;
+  EFI_STATUS                      Status;
+  BOOLEAN                         Done;
+  EDIT_FILE_TYPE                  BufferType;
+
+  //
+  // variable initialization
+  //
+  Size        = 0;
+  Offset      = 0;
+  BufferType  = HMainEditor.BufferImage->BufferType;
+
+  //
+  // if current buffer is modified, so you need to choose
+  // whether to save it first.
+  //
+  if (HMainEditor.BufferImage->Modified) {
+
+    Status = InputBarSetPrompt (L"Buffer modified. Save (Yes/No/Cancel) ? ");
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // the answer is just one character
+    //
+    Status = InputBarSetStringSize (1);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // loop for user's answer
+    // valid answer is just 'y' 'Y', 'n' 'N', 'c' 'C'
+    //
+    Done = FALSE;
+    while (!Done) {
+      Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+      //
+      // ESC pressed
+      //
+      if (Status == EFI_NOT_READY) {
+        return EFI_SUCCESS;
+      }
+
+      switch (InputBarGetString()[0]) {
+      case L'y':
+      case L'Y':
+        //
+        // want to save this buffer first
+        //
+        Status = HBufferImageSave (
+                  HMainEditor.BufferImage->FileImage->FileName,
+                  HMainEditor.BufferImage->DiskImage->Name,
+                  HMainEditor.BufferImage->DiskImage->Offset,
+                  HMainEditor.BufferImage->DiskImage->Size,
+                  HMainEditor.BufferImage->MemImage->Offset,
+                  HMainEditor.BufferImage->MemImage->Size,
+                  BufferType
+                  );
+        if (EFI_ERROR (Status)) {
+          return Status;
+        }
+
+        MainTitleBarRefresh (
+          HMainEditor.BufferImage->BufferType == FileTypeFileBuffer?HMainEditor.BufferImage->FileImage->FileName:HMainEditor.BufferImage->BufferType == FileTypeDiskBuffer?HMainEditor.BufferImage->DiskImage->Name:NULL,
+          HMainEditor.BufferImage->BufferType,
+          HMainEditor.BufferImage->FileImage->ReadOnly,
+          FALSE,
+          HMainEditor.ScreenSize.Column,
+          HMainEditor.ScreenSize.Row
+          );
+        Done = TRUE;
+        break;
+
+      case L'n':
+      case L'N':
+        //
+        // the file won't be saved
+        //
+        Done = TRUE;
+        break;
+
+      case L'c':
+      case L'C':
+        return EFI_SUCCESS;
+      }
+    }
+  }
+  //
+  // get starting offset
+  //
+  Status = InputBarSetPrompt (L"Starting Offset: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (8);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  while (1) {
+    Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+    //
+    // ESC pressed
+    //
+    if (Status == EFI_NOT_READY) {
+
+      return EFI_SUCCESS;
+    }
+    //
+    // THE input string length should > 0
+    //
+    if (StrLen (InputBarGetString()) > 0) {
+      Status = ShellConvertStringToUint64 (InputBarGetString(), &Offset, TRUE, FALSE);
+      if (EFI_ERROR (Status)) {
+        continue;
+      }
+
+      break;
+    }
+  }
+  //
+  // get Number of Blocks:
+  //
+  Status = InputBarSetPrompt (L"Buffer Size: ");
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = InputBarSetStringSize (8);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  while (1) {
+    Status = InputBarRefresh (HMainEditor.ScreenSize.Row, HMainEditor.ScreenSize.Column);
+
+    //
+    // ESC pressed
+    //
+    if (Status == EFI_NOT_READY) {
+
+      return EFI_SUCCESS;
+    }
+    //
+    // THE input string length should > 0
+    //
+    if (StrLen (InputBarGetString()) > 0) {
+      Status = ShellConvertStringToUint64 (InputBarGetString(), &Size, TRUE, FALSE);
+      if (EFI_ERROR (Status)) {
+        continue;
+      }
+
+      if (Size == 0) {
+        continue;
+      }
+
+      break;
+    }
+  }
+
+  if ((Offset + Size - 1)> 0xffffffff) {
+    StatusBarSetStatusString (L"Invalid parameter");
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = HBufferImageRead (
+            NULL,
+            NULL,
+            0,
+            0,
+            (UINTN)Offset,
+            (UINTN)Size,
+            FileTypeMemBuffer,
+            FALSE
+            );
+
+  if (EFI_ERROR (Status)) {
+    StatusBarSetStatusString (L"Read Device Error!");
+    HBufferImageRead (
+      HMainEditor.BufferImage->FileImage->FileName,
+      HMainEditor.BufferImage->DiskImage->Name,
+      HMainEditor.BufferImage->DiskImage->Offset,
+      HMainEditor.BufferImage->DiskImage->Size,
+      HMainEditor.BufferImage->MemImage->Offset,
+      HMainEditor.BufferImage->MemImage->Size,
+      BufferType,
+      TRUE
+      );
+    return EFI_NOT_FOUND;
+  }
+  return EFI_SUCCESS;
+
+}
+
+CONST EDITOR_MENU_ITEM HexEditorMenuItems[] = {
+  {
+    STRING_TOKEN(STR_HEXEDIT_LIBMENUBAR_GO_TO_OFFSET),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F1),
+    HMainCommandGoToOffset
+  },
+  {
+    STRING_TOKEN(STR_HEXEDIT_LIBMENUBAR_SAVE_BUFFER),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F2),
+    HMainCommandSaveBuffer
+  },
+  {
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_EXIT),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F3),
+    HMainCommandExit
+  },
+
+  {
+    STRING_TOKEN(STR_HEXEDIT_LIBMENUBAR_SELECT_START),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F4),
+    HMainCommandSelectStart
+  },
+  {
+    STRING_TOKEN(STR_HEXEDIT_LIBMENUBAR_SELECT_END),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F5),
+    HMainCommandSelectEnd
+  },
+  {
+    STRING_TOKEN(STR_HEXEDIT_LIBMENUBAR_CUT),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F6),
+    HMainCommandCut
+  },
+  {
+    STRING_TOKEN(STR_HEXEDIT_LIBMENUBAR_PASTE),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F7),
+    HMainCommandPaste
+  },
+
+  {
+    STRING_TOKEN(STR_HEXEDIT_LIBMENUBAR_OPEN_FILE),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F8),
+    HMainCommandOpenFile
+  },
+  {
+    STRING_TOKEN(STR_HEXEDIT_LIBMENUBAR_OPEN_DISK),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F9),
+    HMainCommandOpenDisk
+  },
+  {
+    STRING_TOKEN(STR_HEXEDIT_LIBMENUBAR_OPEN_MEMORY),
+    STRING_TOKEN(STR_EDIT_LIBMENUBAR_F10),
+    HMainCommandOpenMemory
+  },
+
+  {
+    0,
+    0,
+    NULL
+  }
+};
+
+
+EFI_STATUS
+HMainEditorInit (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Init function for MainEditor
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+
+--*/
+{
+  EFI_STATUS  Status;
+  EFI_HANDLE  *HandleBuffer;
+  UINTN       HandleCount;
+  UINTN       Index;
+
+  //
+  // basic initialization
+  //
+  CopyMem (&HMainEditor, &HMainEditorConst, sizeof (HMainEditor));
+
+  //
+  // set screen attributes
+  //
+  HMainEditor.ColorAttributes.Colors.Foreground = gST->ConOut->Mode->Attribute & 0x000000ff;
+
+  HMainEditor.ColorAttributes.Colors.Background = (UINT8) (gST->ConOut->Mode->Attribute >> 4);
+
+  HOriginalColors = HMainEditor.ColorAttributes.Colors;
+
+  HOriginalMode = gST->ConOut->Mode->Mode;
+
+  //
+  // query screen size
+  //
+  gST->ConOut->QueryMode (
+        gST->ConOut,
+        gST->ConOut->Mode->Mode,
+        &(HMainEditor.ScreenSize.Column),
+        &(HMainEditor.ScreenSize.Row)
+        );
+
+  //
+  // Find mouse in System Table ConsoleInHandle
+  //
+  Status = gBS->HandleProtocol (
+                gST->ConIn,
+                &gEfiSimplePointerProtocolGuid,
+                (VOID**)&HMainEditor.MouseInterface
+                );
+  if (EFI_ERROR (Status)) {
+    //
+    // If there is no Simple Pointer Protocol on System Table
+    //
+    HandleBuffer = NULL;
+    HMainEditor.MouseInterface = NULL;
+    Status = gBS->LocateHandleBuffer (
+                  ByProtocol,
+                  &gEfiSimplePointerProtocolGuid,
+                  NULL,
+                  &HandleCount,
+                  &HandleBuffer
+                  );
+    if (!EFI_ERROR (Status) && HandleCount > 0) {
+      //
+      // Try to find the first available mouse device
+      //
+      for (Index = 0; Index < HandleCount; Index++) {
+        Status = gBS->HandleProtocol (
+                      HandleBuffer[Index],
+                      &gEfiSimplePointerProtocolGuid,
+                      (VOID**)&HMainEditor.MouseInterface
+                      );
+        if (!EFI_ERROR (Status)) {
+          break;
+        }
+      }
+    }
+    if (HandleBuffer != NULL) {
+      FreePool (HandleBuffer);
+    }
+  }
+
+  if (!EFI_ERROR (Status) && HMainEditor.MouseInterface != NULL) {
+    HMainEditor.MouseAccumulatorX  = 0;
+    HMainEditor.MouseAccumulatorY  = 0;
+    HMainEditor.MouseSupported     = TRUE;
+  }
+
+  //
+  // below will call the five components' init function
+  //
+  Status = MainTitleBarInit (NULL);
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_LIBEDITOR_MAINEDITOR_TITLE), gShellDebug1HiiHandle);
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = MenuBarInit (HexEditorMenuItems);
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_LIBEDITOR_MAINEDITOR_MAINMENU), gShellDebug1HiiHandle);
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = StatusBarInit ();
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_LIBEDITOR_MAINEDITOR_STATUS), gShellDebug1HiiHandle);
+    return EFI_LOAD_ERROR;
+  }
+
+  InputBarInit ();
+
+  Status = HBufferImageInit ();
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_LIBEDITOR_MAINEDITOR_BUFFERIMAGE), gShellDebug1HiiHandle);
+    return EFI_LOAD_ERROR;
+  }
+
+  Status = HClipBoardInit ();
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_LIBEDITOR_MAINEDITOR_CLIPBOARD), gShellDebug1HiiHandle);
+    return EFI_LOAD_ERROR;
+  }
+  //
+  // clear whole screen and enable cursor
+  //
+  gST->ConOut->ClearScreen (gST->ConOut);
+  gST->ConOut->EnableCursor (gST->ConOut, TRUE);
+
+  //
+  // initialize EditorFirst and EditorExit
+  //
+  HEditorFirst        = TRUE;
+  HEditorExit         = FALSE;
+  HEditorMouseAction  = FALSE;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMainEditorCleanup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  cleanup function for MainEditor
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+
+--*/
+{
+  EFI_STATUS  Status;
+
+  //
+  // call the five components' cleanup function
+  //
+  MainTitleBarCleanup ();
+
+  MenuBarCleanup ();
+
+  StatusBarCleanup ();
+  
+  InputBarCleanup ();
+  
+  Status = HBufferImageCleanup ();
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_LIBEDITOR_BUFFERIMAGE_CLEAN), gShellDebug1HiiHandle);
+  }
+
+  Status = HClipBoardCleanup ();
+  if (EFI_ERROR (Status)) {
+    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HEXEDIT_LIBEDITOR_CLIPBOARD_CLEAN), gShellDebug1HiiHandle);
+  }
+  //
+  // restore old mode
+  //
+  if (HOriginalMode != gST->ConOut->Mode->Mode) {
+    gST->ConOut->SetMode (gST->ConOut, HOriginalMode);
+  }
+
+  gST->ConOut->SetAttribute (
+        gST->ConOut,
+        EFI_TEXT_ATTR (HOriginalColors.Foreground, HOriginalColors.Background)
+        );
+  gST->ConOut->ClearScreen (gST->ConOut);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMainEditorRefresh (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Refresh function for MainEditor
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  //
+  // to aVOID screen flicker
+  // the stall value is from experience
+  //
+  gBS->Stall (50);
+
+  //
+  // call the four components refresh function
+  //
+  MainTitleBarRefresh (
+    HMainEditor.BufferImage->BufferType == FileTypeFileBuffer?HMainEditor.BufferImage->FileImage->FileName:HMainEditor.BufferImage->BufferType == FileTypeDiskBuffer?HMainEditor.BufferImage->DiskImage->Name:NULL,
+    HMainEditor.BufferImage->BufferType,
+    HMainEditor.BufferImage->FileImage->ReadOnly,
+    HMainEditor.BufferImage->Modified,
+    HMainEditor.ScreenSize.Column,
+    HMainEditor.ScreenSize.Row
+    );
+  HBufferImageRefresh ();
+  StatusBarRefresh (
+    HEditorFirst,
+    HMainEditor.ScreenSize.Row,
+    HMainEditor.ScreenSize.Column,
+    0,
+    0,
+    TRUE
+    );
+  MenuBarRefresh (    
+    HMainEditor.ScreenSize.Row,
+    HMainEditor.ScreenSize.Column);
+
+  //
+  // EditorFirst is now set to FALSE
+  //
+  HEditorFirst = FALSE;
+
+  return EFI_SUCCESS;
+}
+
+STATIC
+EFI_STATUS
+HMainEditorHandleMouseInput (
+  IN  EFI_SIMPLE_POINTER_STATE       MouseState,
+  OUT BOOLEAN                        *BeforeLeftButtonDown
+  )
+{
+
+  INT32             TextX;
+  INT32             TextY;
+  UINTN             FRow;
+  UINTN             FCol;
+  BOOLEAN           HighBits;
+  LIST_ENTRY    *Link;
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             Index;
+  BOOLEAN           Action;
+
+  Action = FALSE;
+
+  //
+  // have mouse movement
+  //
+  if (MouseState.RelativeMovementX || MouseState.RelativeMovementY) {
+    //
+    // handle
+    //
+    TextX = HGetTextX (MouseState.RelativeMovementX);
+    TextY = HGetTextY (MouseState.RelativeMovementY);
+
+    HBufferImageAdjustMousePosition (TextX, TextY);
+
+    Action = TRUE;
+
+  }
+
+  if (MouseState.LeftButton) {
+    HighBits = HBufferImageIsAtHighBits (
+                HMainEditor.BufferImage->MousePosition.Column,
+                &FCol
+                );
+
+    //
+    // not at an movable place
+    //
+    if (FCol == 0) {
+      //
+      // now just move mouse pointer to legal position
+      //
+      //
+      // move mouse position to legal position
+      //
+      HMainEditor.BufferImage->MousePosition.Column -= 10;
+      if (HMainEditor.BufferImage->MousePosition.Column > 24) {
+        HMainEditor.BufferImage->MousePosition.Column--;
+        FCol = HMainEditor.BufferImage->MousePosition.Column / 3 + 1 + 1;
+      } else {
+        if (HMainEditor.BufferImage->MousePosition.Column < 24) {
+          FCol = HMainEditor.BufferImage->MousePosition.Column / 3 + 1 + 1;
+        } else {
+          //
+          // == 24
+          //
+          FCol = 9;
+        }
+      }
+
+      HighBits = TRUE;
+
+    }
+
+    FRow = HMainEditor.BufferImage->BufferPosition.Row +
+      HMainEditor.BufferImage->MousePosition.Row -
+      HMainEditor.BufferImage->DisplayPosition.Row;
+
+    if (HMainEditor.BufferImage->NumLines < FRow) {
+      //
+      // dragging
+      //
+      //
+      // now just move mouse pointer to legal position
+      //
+      FRow      = HMainEditor.BufferImage->NumLines;
+      HighBits  = TRUE;
+    }
+
+    Link = HMainEditor.BufferImage->ListHead->ForwardLink;
+    for (Index = 0; Index < FRow - 1; Index++) {
+      Link = Link->ForwardLink;
+    }
+
+    Line = CR (Link, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+
+    //
+    // dragging
+    //
+    //
+    // now just move mouse pointer to legal position
+    //
+    if (FCol > Line->Size) {
+      if (*BeforeLeftButtonDown) {
+        HighBits = FALSE;
+
+        if (Line->Size == 0) {
+          if (FRow > 1) {
+            FRow--;
+            FCol = 16;
+          } else {
+            FRow  = 1;
+            FCol  = 1;
+          }
+
+        } else {
+          FCol = Line->Size;
+        }
+      } else {
+        FCol      = Line->Size + 1;
+        HighBits  = TRUE;
+      }
+    }
+
+    HBufferImageMovePosition (FRow, FCol, HighBits);
+
+    HMainEditor.BufferImage->MousePosition.Row    = HMainEditor.BufferImage->DisplayPosition.Row;
+
+    HMainEditor.BufferImage->MousePosition.Column = HMainEditor.BufferImage->DisplayPosition.Column;
+
+    *BeforeLeftButtonDown                         = TRUE;
+
+    Action = TRUE;
+  } else {
+    //
+    // else of if LButton
+    //
+    // release LButton
+    //
+    if (*BeforeLeftButtonDown == TRUE) {
+      Action = TRUE;
+    }
+    //
+    // mouse up
+    //
+    *BeforeLeftButtonDown = FALSE;
+  }
+
+  if (Action) {
+    return EFI_SUCCESS;
+  }
+
+  return EFI_NOT_FOUND;
+}
+
+EFI_STATUS
+HMainEditorKeyInput (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Handle user key input. will route it to other components handle function
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+  EFI_INPUT_KEY             Key;
+  EFI_STATUS                Status;
+  EFI_SIMPLE_POINTER_STATE  MouseState;
+  BOOLEAN                   LengthChange;
+  UINTN                     Size;
+  UINTN                     OldSize;
+  BOOLEAN                   BeforeMouseIsDown;
+  BOOLEAN                   MouseIsDown;
+  BOOLEAN                   FirstDown;
+  BOOLEAN                   MouseDrag;
+  UINTN                     FRow;
+  UINTN                     FCol;
+  UINTN                     SelectStartBackup;
+  UINTN                     SelectEndBackup;
+
+  //
+  // variable initialization
+  //
+  OldSize       = 0;
+  FRow          = 0;
+  FCol          = 0;
+  LengthChange  = FALSE;
+
+  MouseIsDown   = FALSE;
+  FirstDown     = FALSE;
+  MouseDrag     = FALSE;
+
+  do {
+
+    Status              = EFI_SUCCESS;
+
+    HEditorMouseAction  = FALSE;
+
+    //
+    // backup some key elements, so that can aVOID some refresh work
+    //
+    HMainEditorBackup ();
+
+    //
+    // wait for user key input
+    //
+    //
+    // change priority of checking mouse/keyboard activity dynamically
+    // so prevent starvation of keyboard.
+    // if last time, mouse moves then this time check keyboard
+    //
+    if (HMainEditor.MouseSupported) {
+      Status = HMainEditor.MouseInterface->GetState (
+                                            HMainEditor.MouseInterface,
+                                            &MouseState
+                                            );
+      if (!EFI_ERROR (Status)) {
+
+        BeforeMouseIsDown = MouseIsDown;
+
+        Status            = HMainEditorHandleMouseInput (MouseState, &MouseIsDown);
+
+        if (!EFI_ERROR (Status)) {
+          if (BeforeMouseIsDown == FALSE) {
+            //
+            // mouse down
+            //
+            if (MouseIsDown == TRUE) {
+              FRow              = HBufferImage.BufferPosition.Row;
+              FCol              = HBufferImage.BufferPosition.Column;
+              SelectStartBackup = HMainEditor.SelectStart;
+              SelectEndBackup   = HMainEditor.SelectEnd;
+
+              FirstDown         = TRUE;
+            }
+          } else {
+
+            SelectStartBackup = HMainEditor.SelectStart;
+            SelectEndBackup   = HMainEditor.SelectEnd;
+
+            //
+            // begin to drag
+            //
+            if (MouseIsDown == TRUE) {
+              if (FirstDown == TRUE) {
+                if (MouseState.RelativeMovementX || MouseState.RelativeMovementY) {
+                  HMainEditor.SelectStart = 0;
+                  HMainEditor.SelectEnd   = 0;
+                  HMainEditor.SelectStart = (FRow - 1) * 0x10 + FCol;
+
+                  MouseDrag               = TRUE;
+                  FirstDown               = FALSE;
+                }
+              } else {
+                if ((
+                      (HBufferImage.BufferPosition.Row - 1) *
+                    0x10 +
+                    HBufferImage.BufferPosition.Column
+                      ) >= HMainEditor.SelectStart
+                        ) {
+                  HMainEditor.SelectEnd = (HBufferImage.BufferPosition.Row - 1) *
+                    0x10 +
+                    HBufferImage.BufferPosition.Column;
+                } else {
+                  HMainEditor.SelectEnd = 0;
+                }
+              }
+              //
+              // end of if RelativeX/Y
+              //
+            } else {
+              //
+              // mouse is up
+              //
+              if (MouseDrag) {
+                if (HBufferImageGetTotalSize () == 0) {
+                  HMainEditor.SelectStart = 0;
+                  HMainEditor.SelectEnd   = 0;
+                  FirstDown               = FALSE;
+                  MouseDrag               = FALSE;
+                }
+
+                if ((
+                      (HBufferImage.BufferPosition.Row - 1) *
+                    0x10 +
+                    HBufferImage.BufferPosition.Column
+                      ) >= HMainEditor.SelectStart
+                        ) {
+                  HMainEditor.SelectEnd = (HBufferImage.BufferPosition.Row - 1) *
+                    0x10 +
+                    HBufferImage.BufferPosition.Column;
+                } else {
+                  HMainEditor.SelectEnd = 0;
+                }
+
+                if (HMainEditor.SelectEnd == 0) {
+                  HMainEditor.SelectStart = 0;
+                }
+              }
+
+              FirstDown = FALSE;
+              MouseDrag = FALSE;
+            }
+
+            if (SelectStartBackup != HMainEditor.SelectStart || SelectEndBackup != HMainEditor.SelectEnd) {
+              if ((SelectStartBackup - 1) / 0x10 != (HMainEditor.SelectStart - 1) / 0x10) {
+                HBufferImageNeedRefresh = TRUE;
+              } else {
+                if ((SelectEndBackup - 1) / 0x10 != (HMainEditor.SelectEnd - 1) / 0x10) {
+                  HBufferImageNeedRefresh = TRUE;
+                } else {
+                  HBufferImageOnlyLineNeedRefresh = TRUE;
+                }
+              }
+            }
+          }
+
+          HEditorMouseAction            = TRUE;
+          HBufferImageMouseNeedRefresh  = TRUE;
+
+        } else if (Status == EFI_LOAD_ERROR) {
+          StatusBarSetStatusString (L"Invalid Mouse Movement ");
+        }
+      }
+    }
+
+    Status = gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);
+    if (!EFI_ERROR (Status)) {
+      //
+      // dispatch to different components' key handling function
+      // so not everywhere has to set this variable
+      //
+      HBufferImageMouseNeedRefresh = TRUE;
+
+      //
+      // clear previous status string
+      //
+      StatusBarSetRefresh();
+
+      if (Key.ScanCode == SCAN_NULL) {
+        Status = HBufferImageHandleInput (&Key);
+      } else if (((Key.ScanCode >= SCAN_UP) && (Key.ScanCode <= SCAN_PAGE_DOWN))) {
+        Status = HBufferImageHandleInput (&Key);
+      } else if (((Key.ScanCode >= SCAN_F1) && Key.ScanCode <= (SCAN_F12))) {
+        Status = MenuBarDispatchFunctionKey (&Key);
+      } else {
+        StatusBarSetStatusString (L"Unknown Command");
+
+        HBufferImageMouseNeedRefresh = FALSE;
+      }
+
+      if (Status != EFI_SUCCESS && Status != EFI_OUT_OF_RESOURCES) {
+        //
+        // not already has some error status
+        //
+        if (StrCmp (L"", StatusBarGetString()) == 0) {
+          StatusBarSetStatusString (L"Disk Error. Try Again");
+        }
+      }
+    }
+    //
+    // decide if has to set length warning
+    //
+    if (HBufferImage.BufferType != HBufferImageBackupVar.BufferType) {
+      LengthChange = FALSE;
+    } else {
+      //
+      // still the old buffer
+      //
+      if (HBufferImage.BufferType != FileTypeFileBuffer) {
+        Size = HBufferImageGetTotalSize ();
+
+        switch (HBufferImage.BufferType) {
+        case FileTypeDiskBuffer:
+          OldSize = HBufferImage.DiskImage->Size * HBufferImage.DiskImage->BlockSize;
+          break;
+
+        case FileTypeMemBuffer:
+          OldSize = HBufferImage.MemImage->Size;
+          break;
+        }
+
+        if (LengthChange == FALSE) {
+          if (OldSize != Size) {
+            StatusBarSetStatusString (L"Disk/Mem Buffer Length should not be changed");
+          }
+        }
+
+        if (OldSize != Size) {
+          LengthChange = TRUE;
+        } else {
+          LengthChange = FALSE;
+        }
+      }
+    }
+    //
+    // after handling, refresh editor
+    //
+    HMainEditorRefresh ();
+
+  } while (Status != EFI_OUT_OF_RESOURCES && !HEditorExit);
+
+  return Status;
+}
+
+/**
+  Backup function for MainEditor.
+**/
+VOID
+EFIAPI
+HMainEditorBackup (
+  VOID
+  )
+{
+  HMainEditorBackupVar.SelectStart  = HMainEditor.SelectStart;
+  HMainEditorBackupVar.SelectEnd    = HMainEditor.SelectEnd;
+  HBufferImageBackup ();
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MainHexEditor.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MainHexEditor.h
new file mode 100644
index 0000000000..c4f2ea6382
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MainHexEditor.h
@@ -0,0 +1,48 @@
+/** @file
+    Defines the Main Editor data type - 
+     - Global variables 
+     - Instances of the other objects of the editor
+     - Main Interfaces
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_EDITOR_H_
+#define _LIB_EDITOR_H_
+
+#include "HexEditor.h"
+
+EFI_STATUS
+HMainEditorInit (
+  VOID
+  );
+EFI_STATUS
+HMainEditorCleanup (
+  VOID
+  );
+EFI_STATUS
+HMainEditorRefresh (
+  VOID
+  );
+EFI_STATUS
+HMainEditorKeyInput (
+  VOID
+  );
+
+/**
+  Backup function for MainEditor.
+**/
+VOID
+EFIAPI
+HMainEditorBackup (
+  VOID
+  );
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MemImage.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MemImage.c
new file mode 100644
index 0000000000..73464906b4
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MemImage.c
@@ -0,0 +1,412 @@
+/** @file
+  Functions to deal with Mem buffer
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "HexEditor.h"
+
+extern EFI_HANDLE                 HImageHandleBackup;
+
+extern HEFI_EDITOR_BUFFER_IMAGE   HBufferImage;
+
+extern BOOLEAN                    HBufferImageNeedRefresh;
+extern BOOLEAN                    HBufferImageOnlyLineNeedRefresh;
+extern BOOLEAN                    HBufferImageMouseNeedRefresh;
+
+extern HEFI_EDITOR_GLOBAL_EDITOR  HMainEditor;
+
+HEFI_EDITOR_MEM_IMAGE             HMemImage;
+HEFI_EDITOR_MEM_IMAGE             HMemImageBackupVar;
+
+EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL   DummyPciRootBridgeIo;
+
+//
+// for basic initialization of HDiskImage
+//
+HEFI_EDITOR_MEM_IMAGE             HMemImageConst = {
+  NULL,
+  0,
+  0
+};
+
+EFI_STATUS
+DummyMemRead (
+  IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL              * This,
+  IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH    Width,
+  IN     UINT64                                   Address,
+  IN     UINTN                                    Count,
+  IN OUT VOID                                     *Buffer
+  );
+
+EFI_STATUS
+DummyMemWrite (
+  IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL              * This,
+  IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH    Width,
+  IN     UINT64                                   Address,
+  IN     UINTN                                    Count,
+  IN OUT VOID                                     *Buffer
+  );
+
+EFI_STATUS
+HMemImageInit (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Initialization function for HDiskImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+
+--*/
+{
+  EFI_STATUS  Status;
+
+  //
+  // basically initialize the HMemImage
+  //
+  CopyMem (&HMemImage, &HMemImageConst, sizeof (HMemImage));
+
+  Status = gBS->LocateProtocol (
+                &gEfiPciRootBridgeIoProtocolGuid,
+                NULL,
+                (VOID**)&HMemImage.IoFncs
+                );
+  if (Status == EFI_NOT_FOUND) {
+    //
+    // For NT32, no EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL is available
+    // Use Dummy PciRootBridgeIo for memory access
+    //
+    ZeroMem (&DummyPciRootBridgeIo, sizeof (EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL));
+    DummyPciRootBridgeIo.Mem.Read  = DummyMemRead;
+    DummyPciRootBridgeIo.Mem.Write = DummyMemWrite;
+    HMemImage.IoFncs = &DummyPciRootBridgeIo;
+    Status = EFI_SUCCESS;
+  }
+  if (!EFI_ERROR (Status)) {
+    return EFI_SUCCESS;
+  } else {
+    return EFI_LOAD_ERROR;
+  }
+}
+
+EFI_STATUS
+HMemImageBackup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Backup function for HDiskImage
+  Only a few fields need to be backup. 
+  This is for making the Disk buffer refresh 
+  as few as possible.
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  HMemImageBackupVar.Offset = HMemImage.Offset;
+  HMemImageBackupVar.Size   = HMemImage.Size;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMemImageCleanup (
+  VOID
+  )
+/*++
+
+Routine Description: 
+
+  Cleanup function for HDiskImage
+
+Arguments:  
+
+  None
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMemImageSetMemOffsetSize (
+  IN UINTN Offset,
+  IN UINTN Size
+  )
+/*++
+
+Routine Description: 
+
+  Set FileName field in HFileImage
+
+Arguments:  
+
+  Offset - The offset
+  Size   - The size
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+
+  HMemImage.Offset  = Offset;
+  HMemImage.Size    = Size;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+HMemImageRead (
+  IN UINTN  Offset,
+  IN UINTN  Size,
+  BOOLEAN   Recover
+  )
+/*++
+
+Routine Description: 
+
+  Read a disk from disk into HBufferImage
+
+Arguments:  
+
+  Offset  - The offset
+  Size    - The size
+  Recover - if is for recover, no information print
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+  EFI_OUT_OF_RESOURCES
+  
+--*/
+{
+
+  EFI_STATUS                      Status;
+  void                            *Buffer;
+  CHAR16                          *Str;
+  HEFI_EDITOR_LINE                *Line;
+
+  EDIT_FILE_TYPE                  BufferTypeBackup;
+
+  BufferTypeBackup        = HBufferImage.BufferType;
+  HBufferImage.BufferType = FileTypeMemBuffer;
+
+  Buffer                  = AllocateZeroPool (Size);
+  if (Buffer == NULL) {
+    StatusBarSetStatusString (L"Read Memory Failed");
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  Status = HMemImage.IoFncs->Mem.Read (
+                                  HMemImage.IoFncs,
+                                  EfiPciWidthUint8,
+                                  Offset,
+                                  Size,
+                                  Buffer
+                                  );
+
+  if (EFI_ERROR (Status)) {
+    FreePool (Buffer);
+    StatusBarSetStatusString (L"Memory Specified Not Accessible");
+    return EFI_LOAD_ERROR;
+  }
+
+  HBufferImageFree ();
+
+  Status = HBufferImageBufferToList (Buffer, Size);
+  FreePool (Buffer);
+
+  if (EFI_ERROR (Status)) {
+    StatusBarSetStatusString (L"Read Memory Failed");
+    return Status;
+  }
+
+  Status  = HMemImageSetMemOffsetSize (Offset, Size);
+
+  HBufferImage.DisplayPosition.Row    = 2;
+  HBufferImage.DisplayPosition.Column = 10;
+
+  HBufferImage.MousePosition.Row      = 2;
+  HBufferImage.MousePosition.Column   = 10;
+
+  HBufferImage.LowVisibleRow          = 1;
+  HBufferImage.HighBits               = TRUE;
+
+  HBufferImage.BufferPosition.Row     = 1;
+  HBufferImage.BufferPosition.Column  = 1;
+
+  if (!Recover) {
+    Str = CatSPrint(NULL, L"%d Lines Read", HBufferImage.NumLines);
+    if (Str == NULL) {
+      StatusBarSetStatusString (L"Read Memory Failed");
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    StatusBarSetStatusString (Str);
+    SHELL_FREE_NON_NULL (Str);
+
+    HMainEditor.SelectStart = 0;
+    HMainEditor.SelectEnd   = 0;
+
+  }
+
+  //
+  // has line
+  //
+  if (HBufferImage.Lines != NULL) {
+    HBufferImage.CurrentLine = CR (HBufferImage.ListHead->ForwardLink, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+  } else {
+    //
+    // create a dummy line
+    //
+    Line = HBufferImageCreateLine ();
+    if (Line == NULL) {
+      StatusBarSetStatusString (L"Read Memory Failed");
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    HBufferImage.CurrentLine = Line;
+  }
+
+  HBufferImage.Modified           = FALSE;
+  HBufferImageNeedRefresh         = TRUE;
+  HBufferImageOnlyLineNeedRefresh = FALSE;
+  HBufferImageMouseNeedRefresh    = TRUE;
+
+  return EFI_SUCCESS;
+
+}
+
+EFI_STATUS
+HMemImageSave (
+  IN UINTN Offset,
+  IN UINTN Size
+  )
+/*++
+
+Routine Description: 
+
+  Save lines in HBufferImage to disk
+
+Arguments:  
+
+  Offset - The offset
+  Size   - The size
+
+Returns:  
+
+  EFI_SUCCESS
+  EFI_LOAD_ERROR
+  EFI_OUT_OF_RESOURCES
+
+--*/
+{
+
+  EFI_STATUS                      Status;
+  VOID                            *Buffer;
+
+  EDIT_FILE_TYPE                  BufferTypeBackup;
+
+  //
+  // not modified, so directly return
+  //
+  if (HBufferImage.Modified == FALSE) {
+    return EFI_SUCCESS;
+  }
+
+  BufferTypeBackup        = HBufferImage.BufferType;
+  HBufferImage.BufferType = FileTypeMemBuffer;
+
+  Buffer                  = AllocateZeroPool (Size);
+
+  if (Buffer == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  Status = HBufferImageListToBuffer (Buffer, Size);
+  if (EFI_ERROR (Status)) {
+    FreePool (Buffer);
+    return Status;
+  }
+  //
+  // write back to memory
+  //
+  Status = HMemImage.IoFncs->Mem.Write (
+                                  HMemImage.IoFncs,
+                                  EfiPciWidthUint8,
+                                  Offset,
+                                  Size,
+                                  Buffer
+                                  );
+
+  FreePool (Buffer);
+
+  if (EFI_ERROR (Status)) {
+    return EFI_LOAD_ERROR;
+  }
+  //
+  // now not modified
+  //
+  HBufferImage.Modified = FALSE;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+DummyMemRead (
+  IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL              * This,
+  IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH    Width,
+  IN     UINT64                                   Address,
+  IN     UINTN                                    Count,
+  IN OUT VOID                                     *Buffer
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+EFI_STATUS
+DummyMemWrite (
+  IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL              * This,
+  IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH    Width,
+  IN     UINT64                                   Address,
+  IN     UINTN                                    Count,
+  IN OUT VOID                                     *Buffer
+  )
+{
+  return EFI_UNSUPPORTED;
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MemImage.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MemImage.h
new file mode 100644
index 0000000000..8805c0d75d
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/MemImage.h
@@ -0,0 +1,52 @@
+/** @file
+  Defines MemImage - the view of the file that is visible at any point, 
+  as well as the event handlers for editing the file
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_MEM_IMAGE_H_
+#define _LIB_MEM_IMAGE_H_
+
+#include "HexEditor.h"
+
+EFI_STATUS
+HMemImageInit (
+  VOID
+  );
+EFI_STATUS
+HMemImageCleanup (
+  VOID
+  );
+EFI_STATUS
+HMemImageBackup (
+  VOID
+  );
+
+EFI_STATUS
+HMemImageSetMemOffsetSize (
+  IN UINTN,
+  IN UINTN
+  );
+
+EFI_STATUS
+HMemImageRead (
+  IN UINTN,
+  IN UINTN,
+  IN BOOLEAN
+  );
+EFI_STATUS
+HMemImageSave (
+  IN UINTN,
+  IN UINTN
+  );
+
+#endif
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Misc.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Misc.c
new file mode 100644
index 0000000000..8ae21450c4
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Misc.c
@@ -0,0 +1,541 @@
+/** @file
+  Implementation of various string and line routines
+  
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "HexEditor.h"
+
+extern BOOLEAN  HEditorMouseAction;
+
+VOID
+HEditorClearLine (
+  IN UINTN Row
+  )
+/*++
+
+Routine Description: 
+
+  Clear line at Row
+
+Arguments:  
+
+  Row -- row number to be cleared ( start from 1 )
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  CHAR16  Line[200];
+  UINTN   Index;
+  UINTN   Limit;
+  UINTN   StartCol;
+
+  if (HEditorMouseAction) {
+    Limit     = 3 * 0x10;
+    StartCol  = 10;
+  } else {
+    Limit     = HMainEditor.ScreenSize.Column;
+    StartCol  = 1;
+  }
+  //
+  // prepare a blank line
+  //
+  for (Index = 0; Index < Limit; Index++) {
+    Line[Index] = ' ';
+  }
+
+  if (Row == HMainEditor.ScreenSize.Row && Limit == HMainEditor.ScreenSize.Column) {
+    //
+    // if '\0' is still at position 80, it will cause first line error
+    //
+    Line[Limit - 1] = '\0';
+  } else {
+    Line[Limit] = '\0';
+  }
+  //
+  // print out the blank line
+  //
+  ShellPrintEx ((INT32)StartCol - 1, (INT32)Row - 1, Line);
+}
+
+HEFI_EDITOR_LINE *
+HLineDup (
+  IN  HEFI_EDITOR_LINE *Src
+  )
+/*++
+
+Routine Description: 
+
+  Duplicate a line
+
+Arguments:  
+
+  Src -- line to be duplicated
+
+Returns:  
+
+  NULL -- wrong
+  Not NULL -- line created
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Dest;
+
+  //
+  // allocate for the line structure
+  //
+  Dest = AllocateZeroPool (sizeof (HEFI_EDITOR_LINE));
+  if (Dest == NULL) {
+    return NULL;
+  }
+
+  Dest->Signature = EFI_EDITOR_LINE_LIST;
+  Dest->Size      = Src->Size;
+
+  CopyMem (Dest->Buffer, Src->Buffer, 0x10);
+
+  Dest->Link = Src->Link;
+
+  return Dest;
+}
+
+VOID
+HLineFree (
+  IN  HEFI_EDITOR_LINE *Src
+  )
+/*++
+
+Routine Description: 
+
+  Free a line and it's internal buffer
+
+Arguments:  
+
+  Src -- line to be freed
+
+Returns:  
+
+  None
+
+--*/
+{
+  if (Src == NULL) {
+    return ;
+  }
+
+  SHELL_FREE_NON_NULL (Src);
+
+}
+
+HEFI_EDITOR_LINE *
+_HLineAdvance (
+  IN  UINTN Count
+  )
+/*++
+
+Routine Description: 
+
+  Advance to the next Count lines
+
+Arguments:  
+
+  Count -- line number to advance
+
+Returns:  
+
+  NULL -- wrong
+  Not NULL -- line after advance
+
+--*/
+{
+  UINTN             Index;
+  HEFI_EDITOR_LINE  *Line;
+
+  Line = HMainEditor.BufferImage->CurrentLine;
+  if (Line == NULL) {
+    return NULL;
+  }
+
+  for (Index = 0; Index < Count; Index++) {
+    //
+    // if already last line
+    //
+    if (Line->Link.ForwardLink == HMainEditor.BufferImage->ListHead) {
+      return NULL;
+    }
+
+    Line = CR (Line->Link.ForwardLink, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+  }
+
+  return Line;
+}
+
+HEFI_EDITOR_LINE *
+_HLineRetreat (
+  IN  UINTN Count
+  )
+/*++
+
+Routine Description: 
+
+  Retreat to the previous Count lines
+
+Arguments:  
+
+  Count -- line number to retreat
+
+Returns:  
+
+  NULL -- wrong
+  Not NULL -- line after retreat
+
+--*/
+{
+  UINTN             Index;
+  HEFI_EDITOR_LINE  *Line;
+
+  Line = HMainEditor.BufferImage->CurrentLine;
+  if (Line == NULL) {
+    return NULL;
+  }
+
+  for (Index = 0; Index < Count; Index++) {
+    //
+    // already the first line
+    //
+    if (Line->Link.BackLink == HMainEditor.BufferImage->ListHead) {
+      return NULL;
+    }
+
+    Line = CR (Line->Link.BackLink, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+  }
+
+  return Line;
+}
+
+HEFI_EDITOR_LINE *
+HMoveLine (
+  IN  INTN Count
+  )
+/*++
+
+Routine Description: 
+
+  Advance/Retreat lines
+
+Arguments:  
+
+  Count -- line number to advance/retreat
+    >0 : advance
+    <0: retreat  
+
+Returns:  
+
+  NULL -- wrong
+  Not NULL -- line after advance
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             AbsCount;
+
+  //
+  // difference with MoveCurrentLine
+  //     just return Line
+  //     do not set currentline to Line
+  //
+  if (Count <= 0) {
+    AbsCount  = -Count;
+    Line      = _HLineRetreat (AbsCount);
+  } else {
+    Line = _HLineAdvance (Count);
+  }
+
+  return Line;
+}
+
+HEFI_EDITOR_LINE *
+HMoveCurrentLine (
+  IN  INTN Count
+  )
+/*++
+
+Routine Description: 
+
+  Advance/Retreat lines and set CurrentLine in BufferImage to it
+
+Arguments:  
+
+  Count -- line number to advance/retreat
+    >0 : advance
+    <0: retreat
+
+Returns:  
+
+  NULL -- wrong
+  Not NULL -- line after advance
+
+
+--*/
+{
+  HEFI_EDITOR_LINE  *Line;
+  UINTN             AbsCount;
+
+  //
+  // <0: retreat
+  // >0: advance
+  //
+  if (Count <= 0) {
+    AbsCount  = -Count;
+    Line      = _HLineRetreat (AbsCount);
+  } else {
+    Line = _HLineAdvance (Count);
+  }
+
+  if (Line == NULL) {
+    return NULL;
+  }
+
+  HMainEditor.BufferImage->CurrentLine = Line;
+
+  return Line;
+}
+
+
+EFI_STATUS
+HFreeLines (
+  IN LIST_ENTRY   *ListHead,
+  IN HEFI_EDITOR_LINE *Lines
+  )
+/*++
+
+Routine Description: 
+
+  Free all the lines in HBufferImage
+    Fields affected:
+    Lines
+    CurrentLine
+    NumLines
+    ListHead 
+
+Arguments:  
+
+  ListHead - The list head
+  Lines - The lines
+
+Returns:  
+
+  EFI_SUCCESS
+
+--*/
+{
+  LIST_ENTRY    *Link;
+  HEFI_EDITOR_LINE  *Line;
+
+  //
+  // release all the lines
+  //
+  if (Lines != NULL) {
+
+    Line  = Lines;
+    Link  = &(Line->Link);
+    do {
+      Line  = CR (Link, HEFI_EDITOR_LINE, Link, EFI_EDITOR_LINE_LIST);
+      Link  = Link->ForwardLink;
+      HLineFree (Line);
+    } while (Link != ListHead);
+  }
+
+  ListHead->ForwardLink = ListHead;
+  ListHead->BackLink = ListHead;
+
+  return EFI_SUCCESS;
+}
+
+UINTN
+HStrStr (
+  IN  CHAR16  *Str,
+  IN  CHAR16  *Pat
+  )
+/*++
+
+Routine Description: 
+
+  Search Pat in Str
+
+Arguments:  
+
+  Str -- mother string
+  Pat -- search pattern
+
+
+Returns:  
+
+  0 : not found
+  >= 1 : found position + 1
+
+--*/
+{
+  INTN  *Failure;
+  INTN  i;
+  INTN  j;
+  INTN  Lenp;
+  INTN  Lens;
+
+  //
+  // this function copies from some lib
+  //
+  Lenp        = StrLen (Pat);
+  Lens        = StrLen (Str);
+
+  Failure     = AllocateZeroPool (Lenp * sizeof (INTN));
+  Failure[0]  = -1;
+  for (j = 1; j < Lenp; j++) {
+    i = Failure[j - 1];
+    while ((Pat[j] != Pat[i + 1]) && (i >= 0)) {
+      i = Failure[i];
+    }
+
+    if (Pat[j] == Pat[i + 1]) {
+      Failure[j] = i + 1;
+    } else {
+      Failure[j] = -1;
+    }
+  }
+
+  i = 0;
+  j = 0;
+  while (i < Lens && j < Lenp) {
+    if (Str[i] == Pat[j]) {
+      i++;
+      j++;
+    } else if (j == 0) {
+      i++;
+    } else {
+      j = Failure[j - 1] + 1;
+    }
+  }
+
+  FreePool (Failure);
+
+  //
+  // 0: not found
+  // >=1 : found position + 1
+  //
+  return ((j == Lenp) ? (i - Lenp) : -1) + 1;
+
+}
+
+INT32
+HGetTextX (
+  IN INT32 GuidX
+  )
+{
+  INT32 Gap;
+
+  HMainEditor.MouseAccumulatorX += GuidX;
+  Gap = (HMainEditor.MouseAccumulatorX * (INT32) HMainEditor.ScreenSize.Column) / (INT32) (50 * (INT32) HMainEditor.MouseInterface->Mode->ResolutionX);
+  HMainEditor.MouseAccumulatorX = (HMainEditor.MouseAccumulatorX * (INT32) HMainEditor.ScreenSize.Column) % (INT32) (50 * (INT32) HMainEditor.MouseInterface->Mode->ResolutionX);
+  HMainEditor.MouseAccumulatorX = HMainEditor.MouseAccumulatorX / (INT32) HMainEditor.ScreenSize.Column;
+  return Gap;
+}
+
+INT32
+HGetTextY (
+  IN INT32 GuidY
+  )
+{
+  INT32 Gap;
+
+  HMainEditor.MouseAccumulatorY += GuidY;
+  Gap = (HMainEditor.MouseAccumulatorY * (INT32) HMainEditor.ScreenSize.Row) / (INT32) (50 * (INT32) HMainEditor.MouseInterface->Mode->ResolutionY);
+  HMainEditor.MouseAccumulatorY = (HMainEditor.MouseAccumulatorY * (INT32) HMainEditor.ScreenSize.Row) % (INT32) (50 * (INT32) HMainEditor.MouseInterface->Mode->ResolutionY);
+  HMainEditor.MouseAccumulatorY = HMainEditor.MouseAccumulatorY / (INT32) HMainEditor.ScreenSize.Row;
+
+  return Gap;
+}
+
+EFI_STATUS
+HXtoi (
+  IN  CHAR16  *Str,
+  OUT UINTN   *Value
+  )
+/*++
+Routine Description:
+
+  convert hex string to uint
+  
+Arguments:
+
+  Str   - The string
+  Value - The value
+
+Returns:
+
+
+--*/
+{
+  UINT64  u;
+  CHAR16  c;
+  UINTN   Size;
+
+  Size = sizeof (UINTN);
+
+  //
+  // skip leading white space
+  //
+  while (*Str && *Str == ' ') {
+    Str += 1;
+  }
+
+  if (StrLen (Str) > Size * 2) {
+    return EFI_LOAD_ERROR;
+  }
+  //
+  // convert hex digits
+  //
+  u = 0;
+  c = *Str;
+  while (c) {
+    c = *Str;
+    Str++;
+
+    if (c == 0) {
+      break;
+    }
+    //
+    // not valid char
+    //
+    if (!((c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F') || (c >= '0' && c <= '9') || (c == '\0'))) {
+      return EFI_LOAD_ERROR;
+    }
+
+    if (c >= 'a' && c <= 'f') {
+      c -= 'a' - 'A';
+    }
+
+    if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F')) {
+      u = LShiftU64 (u, 4) + (c - (c >= 'A' ? 'A' - 10 : '0'));
+    } else {
+      //
+      // '\0'
+      //
+      break;
+    }
+  }
+
+  *Value = (UINTN) u;
+
+  return EFI_SUCCESS;
+}
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Misc.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Misc.h
new file mode 100644
index 0000000000..a9b59ff514
--- /dev/null
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/Misc.h
@@ -0,0 +1,96 @@
+/** @file
+    Definitions for various line and string routines
+
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _LIB_MISC_H_
+#define _LIB_MISC_H_
+
+#include "HexEditor.h"
+
+VOID
+HEditorClearLine (
+  UINTN
+  );
+HEFI_EDITOR_LINE  *
+HLineDup (
+  HEFI_EDITOR_LINE *
+  );
+VOID
+HLineFree (
+  HEFI_EDITOR_LINE *
+  );
+
+HEFI_EDITOR_LINE  *
+HMoveLine (
+  INTN
+  );
+HEFI_EDITOR_LINE  *
+HMoveCurrentLine (
+  INTN
+  );
+
+UINTN
+HLineStrInsert (
+  HEFI_EDITOR_LINE  *,
+  CHAR16,
+  UINTN,
+  UINTN
+  );
+
+VOID
+HLineCat (
+  HEFI_EDITOR_LINE *,
+  HEFI_EDITOR_LINE *
+  );
+
+VOID
+HLineDeleteAt (
+  HEFI_EDITOR_LINE  *,
+  UINTN
+  );
+
+UINTN
+HUnicodeToAscii (
+  CHAR16    *,
+  UINTN,
+  CHAR8     *
+  );
+
+UINTN
+HStrStr (
+  CHAR16    *,
+  CHAR16    *
+  );
+
+EFI_STATUS
+HFreeLines (
+  LIST_ENTRY   *,
+  HEFI_EDITOR_LINE *
+  );
+
+INT32
+HGetTextX (
+  INT32
+  ) ;
+INT32
+HGetTextY (
+  INT32
+  ) ;
+
+EFI_STATUS
+HXtoi (
+  CHAR16    *,
+  UINTN     *
+  );
+
+#endif
author	jcarsey <jcarsey@6f19259b-4bc3-4df7-8a09-765794883524>	2011-03-25 21:15:07 +0000
committer	jcarsey <jcarsey@6f19259b-4bc3-4df7-8a09-765794883524>	2011-03-25 21:15:07 +0000
commit	632820d1cf1ce7a18ef354255eaeae6fdbf383b9 (patch)
tree	4bae0e4268fdf79eb2f3aa8035b413c95cb28f10 /ShellPkg/Library/UefiShellDebug1CommandsLib
parent	5a0fe66eda4a187724b0eb9d660ab21296178af5 (diff)
download	edk2-platforms-632820d1cf1ce7a18ef354255eaeae6fdbf383b9.tar.xz