/*++
Copyright (c) 2006, Intel Corporation
All rights reserved. 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.
Module Name:
ImageFile.c
Abstract:
Revision History
--*/
#include <DxeMain.h>
EFI_STATUS
CoreOpenImageFile (
IN BOOLEAN BootPolicy,
IN VOID *SourceBuffer OPTIONAL,
IN UINTN SourceSize,
IN OUT EFI_DEVICE_PATH_PROTOCOL *FilePath,
OUT EFI_HANDLE *DeviceHandle,
IN IMAGE_FILE_HANDLE *ImageFileHandle,
OUT UINT32 *AuthenticationStatus
)
/*++
Routine Description:
Opens a file for (simple) reading. The simple read abstraction
will access the file either from a memory copy, from a file
system interface, or from the load file interface.
Arguments:
BootPolicy - Policy for Open Image File.
SourceBuffer - Pointer to the memory location containing copy
of the image to be loaded.
SourceSize - The size in bytes of SourceBuffer.
FilePath - The specific file path from which the image is loaded
DeviceHandle - Pointer to the return device handle.
ImageFileHandle - Pointer to the image file handle.
AuthenticationStatus - Pointer to a caller-allocated UINT32 in which the authentication status is returned.
Returns:
EFI_SUCCESS - Image file successfully opened.
EFI_LOAD_ERROR - If the caller passed a copy of the file, and SourceSize is 0.
EFI_INVALID_PARAMETER - File path is not valid.
EFI_NOT_FOUND - File not found.
--*/
{
EFI_STATUS Status;
EFI_DEVICE_PATH_PROTOCOL *TempFilePath;
FILEPATH_DEVICE_PATH *FilePathNode;
MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *FwVolFilePathNode;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Volume;
EFI_FILE_HANDLE FileHandle;
EFI_FILE_HANDLE LastHandle;
EFI_LOAD_FILE_PROTOCOL *LoadFile;
EFI_FIRMWARE_VOLUME_PROTOCOL *FwVol;
EFI_SECTION_TYPE SectionType;
UINT8 *Pe32Buffer;
UINTN Pe32BufferSize;
EFI_FV_FILETYPE Type;
EFI_FV_FILE_ATTRIBUTES Attrib;
EFI_FILE_INFO *FileInfo;
UINTN FileInfoSize;
EFI_GUID *NameGuid;
*AuthenticationStatus = 0;
ZeroMem (ImageFileHandle, sizeof (IMAGE_FILE_HANDLE));
ImageFileHandle->Signature = IMAGE_FILE_HANDLE_SIGNATURE;
//
// If the caller passed a copy of the file, then just use it
//
if (SourceBuffer != NULL) {
ImageFileHandle->Source = SourceBuffer;
ImageFileHandle->SourceSize = SourceSize;
*DeviceHandle = NULL;
if (SourceSize > 0) {
Status = EFI_SUCCESS;
} else {
Status = EFI_LOAD_ERROR;
}
goto Done;
}
//
// Make sure FilePath is valid
//
if (FilePath == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Check to see if it's in a Firmware Volume
//
FwVolFilePathNode = (MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *)FilePath;
Status = CoreDevicePathToInterface (
&gEfiFirmwareVolumeProtocolGuid,
(EFI_DEVICE_PATH_PROTOCOL **)&FwVolFilePathNode,
(VOID*)&FwVol,
DeviceHandle
);
if (!EFI_ERROR (Status)) {
//
// For FwVol File system there is only a single file name that is a GUID.
//
NameGuid = EfiGetNameGuidFromFwVolDevicePathNode (FwVolFilePathNode);
if (NameGuid != NULL) {
SectionType = EFI_SECTION_PE32;
Pe32Buffer = NULL;
Status = FwVol->ReadSection (
FwVol,
NameGuid,
SectionType,
0,
(VOID **)&Pe32Buffer,
&Pe32BufferSize,
AuthenticationStatus
);
if (EFI_ERROR (Status)) {
//
// Try a raw file, since a PE32 SECTION does not exist
//
if (Pe32Buffer != NULL) {
CoreFreePool (Pe32Buffer);
*AuthenticationStatus = 0;
}
Pe32Buffer = NULL;
Status = FwVol->ReadFile (
FwVol,
NameGuid,
(VOID **)&Pe32Buffer,
&Pe32BufferSize,
&Type,
&Attrib,
AuthenticationStatus
);
}
if (!EFI_ERROR (Status)) {
//
// One of the reads passed so we are done
//
ImageFileHandle->Source = Pe32Buffer;
ImageFileHandle->SourceSize = Pe32BufferSize;
ImageFileHandle->FreeBuffer = TRUE;
goto Done;
}
}
}
//
// Attempt to access the file via a file system interface
//
FilePathNode = (FILEPATH_DEVICE_PATH *) FilePath;
Status = CoreDevicePathToInterface (
&gEfiSimpleFileSystemProtocolGuid,
(EFI_DEVICE_PATH_PROTOCOL **)&FilePathNode,
(VOID*)&Volume,
DeviceHandle
);
if (!EFI_ERROR (Status)) {
//
// Open the Volume to get the File System handle
//
Status = Volume->OpenVolume (Volume, &FileHandle);
if (!EFI_ERROR (Status)) {
//
// Parse each MEDIA_FILEPATH_DP node. There may be more than one, since the
// directory information and filename can be seperate. The goal is to inch
// our way down each device path node and close the previous node
//
while (!IsDevicePathEnd (&FilePathNode->Header)) {
if (DevicePathType (&FilePathNode->Header) != MEDIA_DEVICE_PATH ||
DevicePathSubType (&FilePathNode->Header) != MEDIA_FILEPATH_DP) {
Status = EFI_UNSUPPORTED;
}
if (EFI_ERROR (Status)) {
//
// Exit loop on Error
//
break;
}
LastHandle = FileHandle;
FileHandle = NULL;
Status = LastHandle->Open (
LastHandle,
&FileHandle,
FilePathNode->PathName,
EFI_FILE_MODE_READ,
0
);
//
// Close the previous node
//
LastHandle->Close (LastHandle);
FilePathNode = (FILEPATH_DEVICE_PATH *) NextDevicePathNode (&FilePathNode->Header);
}
if (!EFI_ERROR (Status)) {
//
// We have found the file. Now we need to read it. Before we can read the file we need to
// figure out how big the file is.
//
FileInfo = NULL;
FileInfoSize = sizeof (EFI_FILE_INFO);
while (CoreGrowBuffer (&Status, (VOID **)&FileInfo, FileInfoSize)) {
//
// Automatically allocate buffer of the correct size and make the call
//
Status = FileHandle->GetInfo (
FileHandle,
&gEfiFileInfoGuid,
&FileInfoSize,
FileInfo
);
}
if (!EFI_ERROR (Status)) {
//
// Allocate space for the file
//
ImageFileHandle->Source = CoreAllocateBootServicesPool ((UINTN)FileInfo->FileSize);
if (ImageFileHandle->Source != NULL) {
//
// Read the file into the buffer we allocated
//
ImageFileHandle->SourceSize = (UINTN)FileInfo->FileSize;
ImageFileHandle->FreeBuffer = TRUE;
Status = FileHandle->Read (FileHandle, &ImageFileHandle->SourceSize, ImageFileHandle->Source);
//
// Close the file since we are done
//
FileHandle->Close (FileHandle);
} else {
Status = EFI_OUT_OF_RESOURCES;
}
goto Done;
}
}
}
}
//
// Try LoadFile style
//
TempFilePath = FilePath;
Status = CoreDevicePathToInterface (
&gEfiLoadFileProtocolGuid,
&TempFilePath,
(VOID*)&LoadFile,
DeviceHandle
);
if (!EFI_ERROR (Status)) {
//
// Call LoadFile with the correct buffer size
//
while (CoreGrowBuffer (&Status, (VOID **)&ImageFileHandle->Source, ImageFileHandle->SourceSize)) {
Status = LoadFile->LoadFile (
LoadFile,
TempFilePath,
BootPolicy,
&ImageFileHandle->SourceSize,
ImageFileHandle->Source
);
//
// If success or other error happens, stop loop
//
if (Status != EFI_BUFFER_TOO_SMALL) {
break;
}
}
if (!EFI_ERROR (Status) || Status == EFI_ALREADY_STARTED) {
ImageFileHandle->FreeBuffer = TRUE;
goto Done;
}
}
//
// Nothing else to try
//
DEBUG ((EFI_D_LOAD|EFI_D_WARN, "CoreOpenImageFile: Device did not support a known load protocol\n"));
Status = EFI_NOT_FOUND;
Done:
//
// If the file was not accessed, clean up
//
if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
if (ImageFileHandle->FreeBuffer) {
//
// Free the source buffer if we allocated it
//
CoreFreePool (ImageFileHandle->Source);
}
}
return Status;
}
EFI_STATUS
EFIAPI
CoreReadImageFile (
IN VOID *UserHandle,
IN UINTN Offset,
IN OUT UINTN *ReadSize,
OUT VOID *Buffer
)
/*++
Routine Description:
Read image file (specified by UserHandle) into user specified buffer with specified offset
and length.
Arguments:
UserHandle - Image file handle
Offset - Offset to the source file
ReadSize - For input, pointer of size to read;
For output, pointer of size actually read.
Buffer - Buffer to write into
Returns:
EFI_SUCCESS - Successfully read the specified part of file into buffer.
--*/
{
UINTN EndPosition;
IMAGE_FILE_HANDLE *FHand;
FHand = (IMAGE_FILE_HANDLE *)UserHandle;
ASSERT (FHand->Signature == IMAGE_FILE_HANDLE_SIGNATURE);
//
// Move data from our local copy of the file
//
EndPosition = Offset + *ReadSize;
if (EndPosition > FHand->SourceSize) {
*ReadSize = (UINT32)(FHand->SourceSize - Offset);
}
if (Offset >= FHand->SourceSize) {
*ReadSize = 0;
}
CopyMem (Buffer, (CHAR8 *)FHand->Source + Offset, *ReadSize);
return EFI_SUCCESS;
}
EFI_STATUS
CoreDevicePathToInterface (
IN EFI_GUID *Protocol,
IN EFI_DEVICE_PATH_PROTOCOL **FilePath,
OUT VOID **Interface,
OUT EFI_HANDLE *Handle
)
/*++
Routine Description:
Search a handle to a device on a specified device path that supports a specified protocol,
interface of that protocol on that handle is another output.
Arguments:
Protocol - The protocol to search for
FilePath - The specified device path
Interface - Interface of the protocol on the handle
Handle - The handle to the device on the specified device path that supports the protocol.
Returns:
Status code.
--*/
{
EFI_STATUS Status;
Status = CoreLocateDevicePath (Protocol, FilePath, Handle);
if (!EFI_ERROR (Status)) {
Status = CoreHandleProtocol (*Handle, Protocol, Interface);
}
return Status;
}
BOOLEAN
CoreGrowBuffer (
IN OUT EFI_STATUS *Status,
IN OUT VOID **Buffer,
IN UINTN BufferSize
)
/*++
Routine Description:
Helper function called as part of the code needed
to allocate the proper sized buffer for various
EFI interfaces.
Arguments:
Status - Current status
Buffer - Current allocated buffer, or NULL
BufferSize - Current buffer size needed
Returns:
TRUE - if the buffer was reallocated and the caller
should try the API again.
FALSE - buffer could not be allocated and the caller
should not try the API again.
--*/
{
BOOLEAN TryAgain;
TryAgain = FALSE;
//
// If this is an initial request, buffer will be null with a new buffer size
//
if (*Buffer == NULL) {
*Status = EFI_BUFFER_TOO_SMALL;
}
if (BufferSize == 0) {
return TRUE;
}
//
// If the status code is "buffer too small", resize the buffer
//
if (*Status == EFI_BUFFER_TOO_SMALL) {
if (*Buffer != NULL) {
CoreFreePool (*Buffer);
}
*Buffer = CoreAllocateBootServicesPool (BufferSize);
if (*Buffer != NULL) {
TryAgain = TRUE;
} else {
*Status = EFI_OUT_OF_RESOURCES;
}
}
//
// If there's an error, free the buffer
//
if ((!TryAgain) && (EFI_ERROR (*Status)) && (*Buffer)) {
CoreFreePool (*Buffer);
*Buffer = NULL;
}
return TryAgain;
}