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Apply GetFileBufferByFilePath API of DxeServicesLib to replace local CoreOpenImageFile function.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9487 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
lgao4 2009-11-26 01:08:36 +00:00
parent 847166140a
commit 7748df3da9
5 changed files with 105 additions and 557 deletions
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3
MdeModulePkg/Core/Dxe/DxeMain.h
View File

@ -2,7 +2,7 @@
The internal header file includes the common header files, defines The internal header file includes the common header files, defines
internal structure and functions used by DxeCore module. internal structure and functions used by DxeCore module.
Copyright (c) 2006 - 2008, Intel Corporation. <BR> Copyright (c) 2006 - 2009, Intel Corporation. <BR>
All rights reserved. This program and the accompanying materials All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License 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 which accompanies this distribution. The full text of the license may be found at
@ -79,6 +79,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <Library/UefiBootServicesTableLib.h> #include <Library/UefiBootServicesTableLib.h>
#include <Library/ReportStatusCodeLib.h> #include <Library/ReportStatusCodeLib.h>
#include <Library/TimerLib.h> #include <Library/TimerLib.h>
#include <Library/DxeServicesLib.h>
// //
// attributes for reserved memory before it is promoted to system memory // attributes for reserved memory before it is promoted to system memory

5
MdeModulePkg/Core/Dxe/DxeMain.inf
View File

@ -2,7 +2,7 @@
# This is core module in DXE phase. It provides an implementation of DXE Core that is # This is core module in DXE phase. It provides an implementation of DXE Core that is
# compliant with DXE CIS. # compliant with DXE CIS.
# #
# Copyright (c) 2006 - 2008, Intel Corporation. <BR> # Copyright (c) 2006 - 2009, Intel Corporation. <BR>
# All rights reserved. This program and the accompanying materials # All rights reserved. This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License # 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 # which accompanies this distribution. The full text of the license may be found at
@ -32,7 +32,6 @@
[Sources.common] [Sources.common]
DxeMain.h DxeMain.h
SectionExtraction/CoreSectionExtraction.c SectionExtraction/CoreSectionExtraction.c
Image/ImageFile.c
Image/Image.c Image/Image.c
Image/Image.h Image/Image.h
Misc/DebugImageInfo.c Misc/DebugImageInfo.c
@ -89,6 +88,7 @@
DevicePathLib DevicePathLib
ReportStatusCodeLib ReportStatusCodeLib
TimerLib TimerLib
DxeServicesLib
[Guids] [Guids]
gEfiEventMemoryMapChangeGuid ## CONSUMES ## Event gEfiEventMemoryMapChangeGuid ## CONSUMES ## Event
@ -140,4 +140,3 @@
gEfiMdePkgTokenSpaceGuid.PcdStatusCodeValueBootServiceExit gEfiMdePkgTokenSpaceGuid.PcdStatusCodeValueBootServiceExit
gEfiMdePkgTokenSpaceGuid.PcdStatusCodeValueDxeDriverBegin gEfiMdePkgTokenSpaceGuid.PcdStatusCodeValueDxeDriverBegin
gEfiMdePkgTokenSpaceGuid.PcdStatusCodeValueDxeDriverEnd gEfiMdePkgTokenSpaceGuid.PcdStatusCodeValueDxeDriverEnd

107
MdeModulePkg/Core/Dxe/Image/Image.c
View File

@ -1,7 +1,7 @@
/** @file /** @file
Core image handling services to load and unload PeImage. Core image handling services to load and unload PeImage.
Copyright (c) 2006 - 2008, Intel Corporation. <BR> Copyright (c) 2006 - 2009, Intel Corporation. <BR>
All rights reserved. This program and the accompanying materials All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License 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 which accompanies this distribution. The full text of the license may be found at
@ -155,6 +155,49 @@ CoreInitializeImageServices (
); );
} }
/**
Read image file (specified by UserHandle) into user specified buffer with specified offset
and length.
@param UserHandle Image file handle
@param Offset Offset to the source file
@param ReadSize For input, pointer of size to read; For output,
pointer of size actually read.
@param Buffer Buffer to write into
@retval EFI_SUCCESS Successfully read the specified part of file
into buffer.
**/
EFI_STATUS
EFIAPI
CoreReadImageFile (
IN VOID *UserHandle,
IN UINTN Offset,
IN OUT UINTN *ReadSize,
OUT VOID *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;
}
/** /**
Loads, relocates, and invokes a PE/COFF image Loads, relocates, and invokes a PE/COFF image
@ -766,19 +809,63 @@ CoreLoadImageCommon (
return EFI_INVALID_PARAMETER; return EFI_INVALID_PARAMETER;
} }
// ZeroMem (&FHand, sizeof (IMAGE_FILE_HANDLE));
// Get simple read access to the source file FHand.Signature = IMAGE_FILE_HANDLE_SIGNATURE;
//
OriginalFilePath = FilePath; OriginalFilePath = FilePath;
Status = CoreOpenImageFile ( HandleFilePath = FilePath;
DeviceHandle = NULL;
Status = EFI_SUCCESS;
AuthenticationStatus = 0;
//
// If the caller passed a copy of the file, then just use it
//
if (SourceBuffer != NULL) {
FHand.Source = SourceBuffer;
FHand.SourceSize = SourceSize;
CoreLocateDevicePath (&gEfiDevicePathProtocolGuid, &HandleFilePath, &DeviceHandle);
if (SourceSize > 0) {
Status = EFI_SUCCESS;
} else {
Status = EFI_LOAD_ERROR;
}
} else {
if (FilePath == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Get the source file buffer by its device path.
//
FHand.Source = GetFileBufferByFilePath (
BootPolicy, BootPolicy,
SourceBuffer, FilePath,
SourceSize, &FHand.SourceSize,
&FilePath,
&DeviceHandle,
&FHand,
&AuthenticationStatus &AuthenticationStatus
); );
if (FHand.Source == NULL) {
Status = EFI_LOAD_ERROR;
} else {
//
// Try to get the image device handle by checking the match protocol.
//
FHand.FreeBuffer = TRUE;
Status = CoreLocateDevicePath (&gEfiFirmwareVolume2ProtocolGuid, &HandleFilePath, &DeviceHandle);
if (EFI_ERROR (Status)) {
HandleFilePath = FilePath;
Status = CoreLocateDevicePath (&gEfiSimpleFileSystemProtocolGuid, &HandleFilePath, &DeviceHandle);
if (EFI_ERROR (Status)) {
if (!BootPolicy) {
HandleFilePath = FilePath;
Status = CoreLocateDevicePath (&gEfiLoadFile2ProtocolGuid, &HandleFilePath, &DeviceHandle);
}
if (EFI_ERROR (Status)) {
HandleFilePath = FilePath;
Status = CoreLocateDevicePath (&gEfiLoadFileProtocolGuid, &HandleFilePath, &DeviceHandle);
}
}
}
}
}
if (Status == EFI_ALREADY_STARTED) { if (Status == EFI_ALREADY_STARTED) {
Image = NULL; Image = NULL;
goto Done; goto Done;

63
MdeModulePkg/Core/Dxe/Image/Image.h
View File

@ -1,7 +1,7 @@
/** @file /** @file
Data structure and functions to load and unload PeImage. Data structure and functions to load and unload PeImage.
Copyright (c) 2006 - 2008, Intel Corporation. <BR> Copyright (c) 2006 - 2009, Intel Corporation. <BR>
All rights reserved. This program and the accompanying materials All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License 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 which accompanies this distribution. The full text of the license may be found at
@ -89,67 +89,6 @@ typedef struct {
UINTN SourceSize; UINTN SourceSize;
} IMAGE_FILE_HANDLE; } IMAGE_FILE_HANDLE;
/**
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.
@param BootPolicy Policy for Open Image File.
@param SourceBuffer Pointer to the memory location containing copy
of the image to be loaded.
@param SourceSize The size in bytes of SourceBuffer.
@param FilePath The specific file path from which the image is
loaded
@param DeviceHandle Pointer to the return device handle.
@param ImageFileHandle Pointer to the image file handle.
@param AuthenticationStatus Pointer to a caller-allocated UINT32 in which
the authentication status is returned.
@retval EFI_SUCCESS Image file successfully opened.
@retval EFI_LOAD_ERROR If the caller passed a copy of the file, and
SourceSize is 0.
@retval EFI_INVALID_PARAMETER File path is not valid.
@retval EFI_NOT_FOUND File not found.
**/
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
);
/**
Read image file (specified by UserHandle) into user specified buffer with specified offset
and length.
@param UserHandle Image file handle
@param Offset Offset to the source file
@param ReadSize For input, pointer of size to read; For output,
pointer of size actually read.
@param Buffer Buffer to write into
@retval EFI_SUCCESS Successfully read the specified part of file
into buffer.
**/
EFI_STATUS
EFIAPI
CoreReadImageFile (
IN VOID *UserHandle,
IN UINTN Offset,
IN OUT UINTN *ReadSize,
OUT VOID *Buffer
);
/** /**
Loads an EFI image into memory and returns a handle to the image with extended parameters. Loads an EFI image into memory and returns a handle to the image with extended parameters.

478
MdeModulePkg/Core/Dxe/Image/ImageFile.c
View File

@ -1,478 +0,0 @@
/** @file
Handle services to image file.
Copyright (c) 2006 - 2008, Intel Corporation. <BR>
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.
**/
#include "DxeMain.h"
#include "Image.h"
/**
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.
@param Protocol The protocol to search for
@param FilePath The specified device path
@param Interface Interface of the protocol on the handle
@param Handle The handle to the device on the specified device
path that supports the protocol.
@return Status code.
**/
EFI_STATUS
CoreDevicePathToInterface (
IN EFI_GUID *Protocol,
IN EFI_DEVICE_PATH_PROTOCOL **FilePath,
OUT VOID **Interface,
OUT EFI_HANDLE *Handle
)
{
EFI_STATUS Status;
Status = CoreLocateDevicePath (Protocol, FilePath, Handle);
if (!EFI_ERROR (Status)) {
Status = CoreHandleProtocol (*Handle, Protocol, Interface);
}
return Status;
}
/**
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.
@param BootPolicy Policy for Open Image File.
@param SourceBuffer Pointer to the memory location containing copy
of the image to be loaded.
@param SourceSize The size in bytes of SourceBuffer.
@param FilePath The specific file path from which the image is
loaded
@param DeviceHandle Pointer to the return device handle.
@param ImageFileHandle Pointer to the image file handle.
@param AuthenticationStatus Pointer to a caller-allocated UINT32 in which
the authentication status is returned.
@retval EFI_SUCCESS Image file successfully opened.
@retval EFI_LOAD_ERROR If the caller passed a copy of the file, and
SourceSize is 0.
@retval EFI_INVALID_PARAMETER File path is not valid.
@retval EFI_NOT_FOUND File not found.
**/
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
)
{
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_LOAD_FILE2_PROTOCOL *LoadFile2;
EFI_FIRMWARE_VOLUME2_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;
FILEPATH_DEVICE_PATH *OriginalFilePathNode;
OriginalFilePathNode = NULL;
*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;
CoreLocateDevicePath (&gEfiDevicePathProtocolGuid, FilePath, DeviceHandle);
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 (
&gEfiFirmwareVolume2ProtocolGuid,
(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)) {
//
// Duplicate the device path to avoid the access to unaligned device path node.
// Because the device path consists of one or more FILE PATH MEDIA DEVICE PATH
// nodes, It assures the fields in device path nodes are 2 byte aligned.
//
FilePathNode = (FILEPATH_DEVICE_PATH *)DuplicateDevicePath((EFI_DEVICE_PATH_PROTOCOL *)(UINTN)FilePathNode);
if (FilePathNode == NULL) {
FileHandle->Close (FileHandle);
Status = EFI_OUT_OF_RESOURCES;
} else {
OriginalFilePathNode = FilePathNode;
//
// 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);
}
//
// Free the allocated memory pool
//
CoreFreePool(OriginalFilePathNode);
}
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 = 0;
Status = FileHandle->GetInfo (
FileHandle,
&gEfiFileInfoGuid,
&FileInfoSize,
FileInfo
);
if (Status == EFI_BUFFER_TOO_SMALL) {
FileInfo = AllocatePool (FileInfoSize);
if (FileInfo != NULL) {
Status = FileHandle->GetInfo (
FileHandle,
&gEfiFileInfoGuid,
&FileInfoSize,
FileInfo
);
} else {
Status = EFI_OUT_OF_RESOURCES;
goto Done;
}
}
if (!EFI_ERROR (Status)) {
//
// Allocate space for the file
//
ASSERT (FileInfo != NULL);
ImageFileHandle->Source = AllocatePool ((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);
CoreFreePool (FileInfo);
} else {
Status = EFI_OUT_OF_RESOURCES;
}
goto Done;
}
}
}
}
//
// Try LoadFile2 style
//
if (!BootPolicy) {
TempFilePath = *FilePath;
Status = CoreDevicePathToInterface (
&gEfiLoadFile2ProtocolGuid,
&TempFilePath,
(VOID*)&LoadFile2,
DeviceHandle
);
if (!EFI_ERROR (Status)) {
//
// Call LoadFile2 with the correct buffer size
//
ASSERT (ImageFileHandle->SourceSize == 0);
ASSERT (ImageFileHandle->Source == NULL);
Status = LoadFile2->LoadFile (
LoadFile2,
TempFilePath,
BootPolicy,
&ImageFileHandle->SourceSize,
ImageFileHandle->Source
);
if (Status == EFI_BUFFER_TOO_SMALL) {
ImageFileHandle->Source = AllocatePool (ImageFileHandle->SourceSize);
if (ImageFileHandle->Source == NULL) {
Status = EFI_OUT_OF_RESOURCES;
} else {
Status = LoadFile2->LoadFile (
LoadFile2,
TempFilePath,
BootPolicy,
&ImageFileHandle->SourceSize,
ImageFileHandle->Source
);
}
}
if (!EFI_ERROR (Status)) {
ImageFileHandle->FreeBuffer = TRUE;
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
//
ASSERT (ImageFileHandle->SourceSize == 0);
ASSERT (ImageFileHandle->Source == NULL);
Status = LoadFile->LoadFile (
LoadFile,
TempFilePath,
BootPolicy,
&ImageFileHandle->SourceSize,
ImageFileHandle->Source
);
if (Status == EFI_BUFFER_TOO_SMALL) {
ImageFileHandle->Source = AllocatePool (ImageFileHandle->SourceSize);
if (ImageFileHandle->Source == NULL) {
Status = EFI_OUT_OF_RESOURCES;
} else {
Status = LoadFile->LoadFile (
LoadFile,
TempFilePath,
BootPolicy,
&ImageFileHandle->SourceSize,
ImageFileHandle->Source
);
}
}
if (!EFI_ERROR (Status)) {
ImageFileHandle->FreeBuffer = TRUE;
goto Done;
}
}
//
// Nothing else to try
//
DEBUG ((DEBUG_LOAD|DEBUG_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)) {
if (ImageFileHandle->FreeBuffer) {
//
// Free the source buffer if we allocated it
//
CoreFreePool (ImageFileHandle->Source);
}
}
return Status;
}
/**
Read image file (specified by UserHandle) into user specified buffer with specified offset
and length.
@param UserHandle Image file handle
@param Offset Offset to the source file
@param ReadSize For input, pointer of size to read; For output,
pointer of size actually read.
@param Buffer Buffer to write into
@retval EFI_SUCCESS Successfully read the specified part of file
into buffer.
**/
EFI_STATUS
EFIAPI
CoreReadImageFile (
IN VOID *UserHandle,
IN UINTN Offset,
IN OUT UINTN *ReadSize,
OUT VOID *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;
}