1 files changed, 126 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/FilePaths.c b/Core/MdePkg/Library/BaseLib/FilePaths.c
new file mode 100644
index 0000000000..b7ff480bb9
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/FilePaths.c
@@ -0,0 +1,126 @@
+/** @file
+  Defines file-path manipulation functions.
+
+  Copyright (c) 2011 - 2014, 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  <Uefi/UefiBaseType.h>
+#include  <Library/BaseMemoryLib.h>
+#include  <Library/BaseLib.h>
+#include  <Protocol/SimpleTextIn.h>
+
+/**
+  Removes the last directory or file entry in a path by changing the last
+  L'\' to a CHAR_NULL.
+
+  @param[in,out] Path     A pointer to the path to modify.
+
+  @retval FALSE     Nothing was found to remove.
+  @retval TRUE      A directory or file was removed.
+**/
+BOOLEAN
+EFIAPI
+PathRemoveLastItem(
+  IN OUT CHAR16 *Path
+  )
+{
+  CHAR16        *Walker;
+  CHAR16        *LastSlash;
+  //
+  // get directory name from path... ('chop' off extra)
+  //
+  for ( Walker = Path, LastSlash = NULL
+      ; Walker != NULL && *Walker != CHAR_NULL
+      ; Walker++
+     ){
+    if (*Walker == L'\\' && *(Walker + 1) != CHAR_NULL) {
+      LastSlash = Walker+1;
+    }
+  }
+  if (LastSlash != NULL) {
+    *LastSlash = CHAR_NULL;
+    return (TRUE);
+  }
+  return (FALSE);
+}
+
+/**
+  Function to clean up paths.
+
+  - Single periods in the path are removed.
+  - Double periods in the path are removed along with a single parent directory.
+  - Forward slashes L'/' are converted to backward slashes L'\'.
+
+  This will be done inline and the existing buffer may be larger than required
+  upon completion.
+
+  @param[in] Path       The pointer to the string containing the path.
+
+  @return       Returns Path, otherwise returns NULL to indicate that an error has occured.
+**/
+CHAR16*
+EFIAPI
+PathCleanUpDirectories(
+  IN CHAR16 *Path
+  )
+{
+  CHAR16  *TempString;
+  UINTN   TempSize;
+
+  if (Path==NULL) {
+    return(NULL);
+  }
+  //
+  // Fix up the '/' vs '\'
+  //
+  for (TempString = Path ; TempString != NULL && *TempString != CHAR_NULL ; TempString++) {
+    if (*TempString == L'/') {
+      *TempString = L'\\';
+    }
+  }
+  //
+  // Fix up the ..
+  //
+  while ((TempString = StrStr(Path, L"\\..\\")) != NULL) {
+    *TempString = CHAR_NULL;
+    TempString  += 4;
+    PathRemoveLastItem(Path);
+    TempSize = StrSize(TempString);
+    CopyMem(Path+StrLen(Path), TempString, TempSize);
+  }
+  if ((TempString = StrStr(Path, L"\\..")) != NULL && *(TempString + 3) == CHAR_NULL) {
+    *TempString = CHAR_NULL;
+    PathRemoveLastItem(Path);
+  }
+  //
+  // Fix up the .
+  //
+  while ((TempString = StrStr(Path, L"\\.\\")) != NULL) {
+    *TempString = CHAR_NULL;
+    TempString  += 2;
+    TempSize = StrSize(TempString);
+    CopyMem(Path+StrLen(Path), TempString, TempSize);
+  }
+  if ((TempString = StrStr(Path, L"\\.")) != NULL && *(TempString + 2) == CHAR_NULL) {
+    *(TempString + 1) = CHAR_NULL;
+  }
+
+  while ((TempString = StrStr(Path, L"\\\\")) != NULL) {
+    *TempString = CHAR_NULL;
+    TempString  += 1;
+    TempSize = StrSize(TempString);
+    CopyMem(Path+StrLen(Path), TempString, TempSize);
+  }
+  if ((TempString = StrStr(Path, L"\\\\")) != NULL && *(TempString + 1) == CHAR_NULL) {
+    *(TempString) = CHAR_NULL;
+  }
+
+  return (Path);
+}
+