MdeModulePkg/Core/DxeIplPeim/Ipf/ImageRead.c

   1 /*++
   2
   3 Copyright (c) 2006, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   ImageRead.c
  15
  16 Abstract:
  17
  18 --*/
  19
  20 //
  21 // Include common header file for this module.
  22 //
  23 #include "CommonHeader.h"
  24
  25 #include "DxeIpl.h"
  26
  27 EFI_STATUS
  28 PeiImageRead (
  29   IN     VOID    *FileHandle,
  30   IN     UINTN   FileOffset,
  31   IN OUT UINTN   *ReadSize,
  32   OUT    VOID    *Buffer
  33   )
  34 /*++
  35
  36 Routine Description:
  37
  38   Support routine for the PE/COFF Loader that reads a buffer from a PE/COFF file
  39
  40 Arguments:
  41
  42   FileHandle - The handle to the PE/COFF file
  43
  44   FileOffset - The offset, in bytes, into the file to read
  45
  46   ReadSize   - The number of bytes to read from the file starting at FileOffset
  47
  48   Buffer     - A pointer to the buffer to read the data into.
  49
  50 Returns:
  51
  52   EFI_SUCCESS - ReadSize bytes of data were read into Buffer from the PE/COFF file starting at FileOffset
  53
  54 --*/
  55 {
  56   CHAR8 *Destination8;
  57   CHAR8 *Source8;
  58   volatile UINTN Length;
  59
  60   Destination8  = Buffer;
  61   Source8       = (CHAR8 *) ((UINTN) FileHandle + FileOffset);
  62   Length        = *ReadSize;
  63   while (Length--) {
  64     *(Destination8++) = *(Source8++);
  65   }
  66
  67   return EFI_SUCCESS;
  68 }
  69
  70 EFI_STATUS
  71 GetImageReadFunction (
  72   IN      PE_COFF_LOADER_IMAGE_CONTEXT  *ImageContext
  73   )
  74 {
  75   ImageContext->ImageRead = PeiImageRead;
  76   return EFI_SUCCESS;
  77 }