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imagehlp: Recalculate PE checksum after file modification.

oldstable
Owen Rudge 2009-12-04 10:12:02 -06:00 committed by Alexandre Julliard
parent ba5a86e349
commit b49cc56614
1 changed files with 88 additions and 0 deletions
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88
dlls/imagehlp/integrity.c
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@ -285,6 +285,88 @@ static BOOL IMAGEHLP_GetCertificateOffset( HANDLE handle, DWORD num,
return TRUE;
}
/***********************************************************************
* IMAGEHLP_RecalculateChecksum (INTERNAL)
*
* Update the NT header checksum for the specified file.
*/
static BOOL IMAGEHLP_RecalculateChecksum(HANDLE handle)
{
DWORD FileLength, count, HeaderSum, pe_offset, nt_hdr_size;
IMAGE_NT_HEADERS32 nt_hdr32;
IMAGE_NT_HEADERS64 nt_hdr64;
LPVOID BaseAddress;
HANDLE hMapping;
DWORD *CheckSum;
void *nt_hdr;
int ret;
BOOL r;
TRACE("handle %p\n", handle);
ret = IMAGEHLP_GetNTHeaders(handle, &pe_offset, &nt_hdr32, &nt_hdr64);
if (ret == HDR_NT32)
{
CheckSum = &nt_hdr32.OptionalHeader.CheckSum;
nt_hdr = &nt_hdr32;
nt_hdr_size = sizeof(IMAGE_NT_HEADERS32);
}
else if (ret == HDR_NT64)
{
CheckSum = &nt_hdr64.OptionalHeader.CheckSum;
nt_hdr = &nt_hdr64;
nt_hdr_size = sizeof(IMAGE_NT_HEADERS64);
}
else
return FALSE;
hMapping = CreateFileMappingW(handle, NULL, PAGE_READONLY, 0, 0, NULL);
if (!hMapping)
return FALSE;
BaseAddress = MapViewOfFile(hMapping, FILE_MAP_READ, 0, 0, 0);
if (!BaseAddress)
{
CloseHandle(hMapping);
return FALSE;
}
FileLength = GetFileSize(handle, NULL);
*CheckSum = 0;
CheckSumMappedFile(BaseAddress, FileLength, &HeaderSum, CheckSum);
UnmapViewOfFile(BaseAddress);
CloseHandle(hMapping);
if (*CheckSum)
{
/* write the header back again */
count = SetFilePointer(handle, pe_offset, NULL, FILE_BEGIN);
if (count == INVALID_SET_FILE_POINTER)
return FALSE;
count = 0;
r = WriteFile(handle, nt_hdr, nt_hdr_size, &count, NULL);
if (!r)
return FALSE;
if (count != nt_hdr_size)
return FALSE;
return TRUE;
}
return FALSE;
}
/***********************************************************************
* ImageAddCertificate (IMAGEHLP.@)
@ -392,6 +474,9 @@ BOOL WINAPI ImageAddCertificate(
if (!IMAGEHLP_SetSecurityDirOffset(FileHandle, sd_VirtualAddr, size))
return FALSE;
if (!IMAGEHLP_RecalculateChecksum(FileHandle))
return FALSE;
return TRUE;
}
@ -636,6 +721,9 @@ BOOL WINAPI ImageRemoveCertificate(HANDLE FileHandle, DWORD Index)
if (!r)
return FALSE;
if (!IMAGEHLP_RecalculateChecksum(FileHandle))
return FALSE;
return TRUE;
error: