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Implemented PE file checksum calculation.

This commit is contained in:
Eric Kohl 2000-11-25 01:28:09 +00:00 committed by Alexandre Julliard
parent 7379b89185
commit 758c3841cb
1 changed files with 180 additions and 6 deletions
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186
dlls/imagehlp/modify.c
View File

@ -12,6 +12,9 @@
DEFAULT_DEBUG_CHANNEL(imagehlp);
static WORD CalcCheckSum(DWORD StartValue, LPVOID BaseAddress, DWORD WordCount);
/***********************************************************************
* BindImage (IMAGEHLP.@)
*/
@ -36,6 +39,33 @@ BOOL WINAPI BindImageEx(
return FALSE;
}
/***********************************************************************
* CheckSum (internal)
*/
static WORD CalcCheckSum(
DWORD StartValue, LPVOID BaseAddress, DWORD WordCount)
{
LPWORD Ptr;
DWORD Sum;
DWORD i;
Sum = StartValue;
Ptr = (LPWORD)BaseAddress;
for (i = 0; i < WordCount; i++)
{
Sum += *Ptr;
if (HIWORD(Sum) != 0)
{
Sum = LOWORD(Sum) + HIWORD(Sum);
}
Ptr++;
}
return (WORD)(LOWORD(Sum) + HIWORD(Sum));
}
/***********************************************************************
* CheckSumMappedFile (IMAGEHLP.@)
*/
@ -43,11 +73,49 @@ PIMAGE_NT_HEADERS WINAPI CheckSumMappedFile(
LPVOID BaseAddress, DWORD FileLength,
LPDWORD HeaderSum, LPDWORD CheckSum)
{
PIMAGE_NT_HEADERS Header;
DWORD CalcSum;
DWORD HdrSum;
FIXME("(%p, %ld, %p, %p): stub\n",
BaseAddress, FileLength, HeaderSum, CheckSum
);
SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
return NULL;
CalcSum = (DWORD)CalcCheckSum(0,
BaseAddress,
(FileLength + 1) / sizeof(WORD));
Header = ImageNtHeader(BaseAddress);
HdrSum = Header->OptionalHeader.CheckSum;
/* Subtract image checksum from calculated checksum. */
/* fix low word of checksum */
if (LOWORD(CalcSum) >= LOWORD(HdrSum))
{
CalcSum -= LOWORD(HdrSum);
}
else
{
CalcSum = ((LOWORD(CalcSum) - LOWORD(HdrSum)) & 0xFFFF) - 1;
}
/* fix high word of checksum */
if (LOWORD(CalcSum) >= HIWORD(HdrSum))
{
CalcSum -= HIWORD(HdrSum);
}
else
{
CalcSum = ((LOWORD(CalcSum) - HIWORD(HdrSum)) & 0xFFFF) - 1;
}
/* add file length */
CalcSum += FileLength;
*CheckSum = CalcSum;
*HeaderSum = Header->OptionalHeader.CheckSum;
return Header;
}
/***********************************************************************
@ -56,24 +124,130 @@ PIMAGE_NT_HEADERS WINAPI CheckSumMappedFile(
DWORD WINAPI MapFileAndCheckSumA(
LPSTR Filename, LPDWORD HeaderSum, LPDWORD CheckSum)
{
FIXME("(%s, %p, %p): stub\n",
HANDLE hFile;
HANDLE hMapping;
LPVOID BaseAddress;
DWORD FileLength;
TRACE("(%s, %p, %p): stub\n",
debugstr_a(Filename), HeaderSum, CheckSum
);
SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
hFile = CreateFileA(Filename,
GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
0);
if (hFile == INVALID_HANDLE_VALUE)
{
return CHECKSUM_OPEN_FAILURE;
}
hMapping = CreateFileMappingW(hFile,
NULL,
PAGE_READONLY,
0,
0,
NULL);
if (hMapping == 0)
{
CloseHandle(hFile);
return CHECKSUM_MAP_FAILURE;
}
BaseAddress = MapViewOfFile(hMapping,
FILE_MAP_READ,
0,
0,
0);
if (hMapping == 0)
{
CloseHandle(hMapping);
CloseHandle(hFile);
return CHECKSUM_MAPVIEW_FAILURE;
}
FileLength = GetFileSize(hFile,
NULL);
CheckSumMappedFile(BaseAddress,
FileLength,
HeaderSum,
CheckSum);
UnmapViewOfFile(BaseAddress);
CloseHandle(hMapping);
CloseHandle(hFile);
return 0;
}
/***********************************************************************
* MapFileAndCheckSumW (IMAGEHLP.@)
*/
DWORD WINAPI MapFileAndCheckSumW(
LPWSTR Filename, LPDWORD HeaderSum, LPDWORD CheckSum)
{
FIXME("(%s, %p, %p): stub\n",
HANDLE hFile;
HANDLE hMapping;
LPVOID BaseAddress;
DWORD FileLength;
TRACE("(%s, %p, %p): stub\n",
debugstr_w(Filename), HeaderSum, CheckSum
);
SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
hFile = CreateFileW(Filename,
GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
0);
if (hFile == INVALID_HANDLE_VALUE)
{
return CHECKSUM_OPEN_FAILURE;
}
hMapping = CreateFileMappingW(hFile,
NULL,
PAGE_READONLY,
0,
0,
NULL);
if (hMapping == 0)
{
CloseHandle(hFile);
return CHECKSUM_MAP_FAILURE;
}
BaseAddress = MapViewOfFile(hMapping,
FILE_MAP_READ,
0,
0,
0);
if (hMapping == 0)
{
CloseHandle(hMapping);
CloseHandle(hFile);
return CHECKSUM_MAPVIEW_FAILURE;
}
FileLength = GetFileSize(hFile,
NULL);
CheckSumMappedFile(BaseAddress,
FileLength,
HeaderSum,
CheckSum);
UnmapViewOfFile(BaseAddress);
CloseHandle(hMapping);
CloseHandle(hFile);
return 0;
}
/***********************************************************************