static DWORD VerifyFile(
HANDLE hMpq,
const char * szFileName,
LPDWORD pdwCrc32,
char * pMD5,
DWORD dwFlags)
{
hash_state md5_state;
unsigned char * pFileMd5;
unsigned char md5[MD5_DIGEST_SIZE];
TFileEntry * pFileEntry;
TMPQFile * hf;
BYTE Buffer[0x1000];
HANDLE hFile = NULL;
DWORD dwVerifyResult = 0;
DWORD dwSearchScope = SFILE_OPEN_FROM_MPQ;
DWORD dwTotalBytes = 0;
DWORD dwBytesRead;
DWORD dwCrc32 = 0;
// Fix the open type for patched archives
if(SFileIsPatchedArchive(hMpq))
dwSearchScope = SFILE_OPEN_PATCHED_FILE;
// Attempt to open the file
if(SFileOpenFileEx(hMpq, szFileName, dwSearchScope, &hFile))
{
// Get the file size
hf = (TMPQFile *)hFile;
pFileEntry = hf->pFileEntry;
dwTotalBytes = SFileGetFileSize(hFile, NULL);
// Initialize the CRC32 and MD5 contexts
md5_init(&md5_state);
dwCrc32 = crc32(0, Z_NULL, 0);
// If we have to verify raw data MD5, do it
if(dwFlags & SFILE_VERIFY_RAW_MD5)
{
if(hf->ha->pHeader->dwRawChunkSize != 0)
{
// Note: we have to open the file from the MPQ where it was open from
if(VerifyRawMpqData(hf->ha, pFileEntry->ByteOffset, pFileEntry->dwCmpSize) != ERROR_SUCCESS)
dwVerifyResult |= VERIFY_FILE_RAW_MD5_ERROR;
dwVerifyResult |= VERIFY_FILE_HAS_RAW_MD5;
}
}
// Also turn on sector checksum verification
if(dwFlags & SFILE_VERIFY_SECTOR_CRC)
hf->bCheckSectorCRCs = true;
// Go through entire file and update both CRC32 and MD5
for(;;)
{
// Read data from file
SFileReadFile(hFile, Buffer, sizeof(Buffer), &dwBytesRead, NULL);
if(dwBytesRead == 0)
{
if(GetLastError() == ERROR_CHECKSUM_ERROR)
dwVerifyResult |= VERIFY_FILE_SECTOR_CRC_ERROR;
break;
}
// Update CRC32 value
if(dwFlags & SFILE_VERIFY_FILE_CRC)
dwCrc32 = crc32(dwCrc32, Buffer, dwBytesRead);
// Update MD5 value
if(dwFlags & SFILE_VERIFY_FILE_MD5)
md5_process(&md5_state, Buffer, dwBytesRead);
// Decrement the total size
dwTotalBytes -= dwBytesRead;
}
// If the file has sector checksums, indicate it in the flags
if(dwFlags & SFILE_VERIFY_SECTOR_CRC)
{
if((hf->pFileEntry->dwFlags & MPQ_FILE_SECTOR_CRC) && hf->SectorChksums != NULL && hf->SectorChksums[0] != 0)
dwVerifyResult |= VERIFY_FILE_HAS_SECTOR_CRC;
}
// Check if the entire file has been read
// No point in checking CRC32 and MD5 if not
// Skip checksum checks if the file has patches
if(dwTotalBytes == 0)
{
// Check CRC32 and MD5 only if there is no patches
if(hf->hfPatchFile == NULL)
{
// Check if the CRC32 matches.
if(dwFlags & SFILE_VERIFY_FILE_CRC)
{
// Only check the CRC32 if it is valid
if(pFileEntry->dwCrc32 != 0)
{
dwVerifyResult |= VERIFY_FILE_HAS_CHECKSUM;
if(dwCrc32 != pFileEntry->dwCrc32)
dwVerifyResult |= VERIFY_FILE_CHECKSUM_ERROR;
}
}
// Check if MD5 matches
if(dwFlags & SFILE_VERIFY_FILE_MD5)
{
// Patch files have their MD5 saved in the patch info
pFileMd5 = (hf->pPatchInfo != NULL) ? hf->pPatchInfo->md5 : pFileEntry->md5;
md5_done(&md5_state, md5);
// Only check the MD5 if it is valid
if(is_valid_md5(pFileMd5))
{
dwVerifyResult |= VERIFY_FILE_HAS_MD5;
if(memcmp(md5, pFileMd5, MD5_DIGEST_SIZE))
dwVerifyResult |= VERIFY_FILE_MD5_ERROR;
}
}
}
else
{
// Patched files are MD5-checked automatically
dwVerifyResult |= VERIFY_FILE_HAS_MD5;
}
}
else
{
dwVerifyResult |= VERIFY_READ_ERROR;
}
SFileCloseFile(hFile);
}
else
{
// Remember that the file couldn't be open
dwVerifyResult |= VERIFY_OPEN_ERROR;
}
// If the caller required CRC32 and/or MD5, give it to him
if(pdwCrc32 != NULL)
*pdwCrc32 = dwCrc32;
if(pMD5 != NULL)
memcpy(pMD5, md5, MD5_DIGEST_SIZE);
return dwVerifyResult;
}
DWORD WINAPI SFileVerifyFile(HANDLE hMpq, const char * szFileName, DWORD dwFlags)
{
hash_state md5_state;
unsigned char md5[MD5_DIGEST_SIZE];
TFileEntry * pFileEntry;
TMPQFile * hf;
BYTE Buffer[0x1000];
HANDLE hFile = NULL;
DWORD dwVerifyResult = 0;
DWORD dwSearchScope = SFILE_OPEN_FROM_MPQ;
DWORD dwTotalBytes = 0;
DWORD dwBytesRead;
DWORD dwCrc32;
// Fix the open type for patched archives
if (SFileIsPatchedArchive(hMpq))
dwSearchScope = SFILE_OPEN_PATCHED_FILE;
// Attempt to open the file
if (SFileOpenFileEx(hMpq, szFileName, dwSearchScope, &hFile))
{
// Get the file size
hf = (TMPQFile *)hFile;
pFileEntry = hf->pFileEntry;
dwTotalBytes = SFileGetFileSize(hFile, NULL);
// Initialize the CRC32 and MD5 contexts
md5_init(&md5_state);
dwCrc32 = crc32(0, Z_NULL, 0);
// Also turn on sector checksum verification
hf->bCheckSectorCRCs = true;
// Go through entire file and update both CRC32 and MD5
for (;;)
{
// Read data from file
SFileReadFile(hFile, Buffer, sizeof(Buffer), &dwBytesRead, NULL);
if (dwBytesRead == 0)
{
if (GetLastError() == ERROR_CHECKSUM_ERROR)
dwVerifyResult |= VERIFY_SECTOR_CHECKSUM_ERROR;
break;
}
// Update CRC32 value
if (dwFlags & MPQ_ATTRIBUTE_CRC32)
dwCrc32 = crc32(dwCrc32, Buffer, dwBytesRead);
// Update MD5 value
if (dwFlags & MPQ_ATTRIBUTE_MD5)
md5_process(&md5_state, Buffer, dwBytesRead);
// Decrement the total size
dwTotalBytes -= dwBytesRead;
}
// If the file has sector checksums, indicate it in the flags
if ((hf->pFileEntry->dwFlags & MPQ_FILE_SECTOR_CRC) && hf->SectorChksums != NULL && hf->SectorChksums[0] != 0)
dwVerifyResult |= VERIFY_SECTORS_HAVE_CHECKSUM;
// Check if the entire file has been read
// No point in checking CRC32 and MD5 if not
// Skip checksum checks if the file has patches
if (dwTotalBytes == 0)
{
// Check CRC32 and MD5 only if there is no patches
if (hf->hfPatchFile == NULL)
{
// Check if the CRC32 matches.
if (dwFlags & MPQ_ATTRIBUTE_CRC32)
{
// Some files may have their CRC zeroed
if (pFileEntry->dwCrc32 != 0)
{
dwVerifyResult |= VERIFY_FILE_HAS_CHECKSUM;
if (dwCrc32 != pFileEntry->dwCrc32)
dwVerifyResult |= VERIFY_FILE_CHECKSUM_ERROR;
}
}
// Check if MD5 matches
if (dwFlags & MPQ_ATTRIBUTE_MD5)
{
md5_done(&md5_state, md5);
// Some files have the MD5 zeroed. Don't check MD5 in that case
if (is_valid_md5(pFileEntry->md5))
{
dwVerifyResult |= VERIFY_FILE_HAS_MD5;
if (memcmp(md5, pFileEntry->md5, MD5_DIGEST_SIZE))
dwVerifyResult |= VERIFY_FILE_MD5_ERROR;
}
}
}
else
{
// Patched files are MD5-checked automatically
dwVerifyResult |= VERIFY_FILE_HAS_MD5;
}
}
else
{
dwVerifyResult |= VERIFY_READ_ERROR;
}
SFileCloseFile(hFile);
}
else
{
// Remember that the file couldn't be open
dwVerifyResult |= VERIFY_OPEN_ERROR;
}
return dwVerifyResult;
}
