Initial import.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BasePeCoffGetEntryPointLib/PeCoffGetEntryPoint.c

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+/** @file
+  Tiano PE/COFF loader.
+
+  Copyright (c) 2006, 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.
+
+  Module Name:  PeCoffGetEntryPoint.c
+
+**/
+
+
+
+/**
+  Loads a PE/COFF image into memory.
+
+  @param  Pe32Data Pointer to a PE/COFF Image
+  
+  @param  EntryPoint Pointer to the entry point of the PE/COFF image
+
+  @retval EFI_SUCCESS            if the EntryPoint was returned
+  @retval EFI_INVALID_PARAMETER  if the EntryPoint could not be found from Pe32Data
+
+**/
+RETURN_STATUS
+EFIAPI
+PeCoffLoaderGetEntryPoint (
+  IN     VOID  *Pe32Data,
+  IN OUT VOID  **EntryPoint
+  )
+{
+  EFI_IMAGE_DOS_HEADER  *DosHeader;
+  EFI_IMAGE_NT_HEADERS  *PeHeader;
+
+  DosHeader = (EFI_IMAGE_DOS_HEADER *)Pe32Data;
+  if (DosHeader->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
+    //
+    // DOS image header is present, so read the PE header after the DOS image header
+    //
+    PeHeader = (EFI_IMAGE_NT_HEADERS *) ((UINTN) Pe32Data + (UINTN) ((DosHeader->e_lfanew) & 0x0ffff));
+  } else {
+    //
+    // DOS image header is not present, so PE header is at the image base
+    //
+    PeHeader = (EFI_IMAGE_NT_HEADERS *) Pe32Data;
+  }
+  *EntryPoint = (VOID *) ((UINTN) Pe32Data + (UINTN) (PeHeader->OptionalHeader.AddressOfEntryPoint & 0x0ffffffff));
+  return RETURN_SUCCESS;
+}