bool WINAPI SFileReadFile(HANDLE hFile, void * pvBuffer, DWORD dwToRead, LPDWORD pdwRead, LPOVERLAPPED lpOverlapped)
{
TMPQFile * hf = (TMPQFile *)hFile;
DWORD dwBytesRead = 0; // Number of bytes read
int nError = ERROR_SUCCESS;
// Keep compilers happy
lpOverlapped = lpOverlapped;
// Check valid parameters
if(!IsValidFileHandle(hf))
{
SetLastError(ERROR_INVALID_HANDLE);
return false;
}
if(pvBuffer == NULL)
{
SetLastError(ERROR_INVALID_PARAMETER);
return false;
}
// If the file is local file, read the data directly from the stream
if(hf->pStream != NULL)
{
ULONGLONG FilePosition1;
ULONGLONG FilePosition2;
// Because stream I/O functions are designed to read
// "all or nothing", we compare file position before and after,
// and if they differ, we assume that number of bytes read
// is the difference between them
FileStream_GetPos(hf->pStream, FilePosition1);
if(!FileStream_Read(hf->pStream, NULL, pvBuffer, dwToRead))
{
// If not all bytes have been read, then return the number
// of bytes read
if((nError = GetLastError()) == ERROR_HANDLE_EOF)
{
FileStream_GetPos(hf->pStream, FilePosition2);
dwBytesRead = (DWORD)(FilePosition2 - FilePosition1);
}
else
{
nError = GetLastError();
}
}
else
{
dwBytesRead = dwToRead;
}
}
else
{
// If the file is a patch file, we have to read it special way
if(hf->hfPatchFile != NULL && (hf->pFileEntry->dwFlags & MPQ_FILE_PATCH_FILE) == 0)
{
nError = ReadMpqFilePatchFile(hf, pvBuffer, dwToRead, &dwBytesRead);
}
// If the file is single unit file, redirect it to read file
else if(hf->pFileEntry->dwFlags & MPQ_FILE_SINGLE_UNIT)
{
nError = ReadMpqFileSingleUnit(hf, pvBuffer, dwToRead, &dwBytesRead);
}
// Otherwise read it as sector based MPQ file
else
{
nError = ReadMpqFile(hf, pvBuffer, dwToRead, &dwBytesRead);
}
}
// Give the caller the number of bytes read
if(pdwRead != NULL)
*pdwRead = dwBytesRead;
// If the read operation succeeded, but not full number of bytes was read,
// set the last error to ERROR_HANDLE_EOF
if(nError == ERROR_SUCCESS && (dwBytesRead < dwToRead))
nError = ERROR_HANDLE_EOF;
// If something failed, set the last error value
if(nError != ERROR_SUCCESS)
SetLastError(nError);
return (nError == ERROR_SUCCESS);
}
bool WINAPI SFileReadFile(HANDLE hFile, void * pvBuffer, DWORD dwToRead, LPDWORD pdwRead, LPOVERLAPPED lpOverlapped)
{
TMPQFile * hf = (TMPQFile *)hFile;
DWORD dwBytesRead = 0; // Number of bytes read
int nError = ERROR_SUCCESS;
// Always zero the result
if(pdwRead != NULL)
*pdwRead = 0;
lpOverlapped = lpOverlapped;
// Check valid parameters
if(!IsValidFileHandle(hFile))
{
SetLastError(ERROR_INVALID_HANDLE);
return false;
}
if(pvBuffer == NULL)
{
SetLastError(ERROR_INVALID_PARAMETER);
return false;
}
// If we didn't load the patch info yet, do it now
if(hf->pFileEntry != NULL && (hf->pFileEntry->dwFlags & MPQ_FILE_PATCH_FILE) && hf->pPatchInfo == NULL)
{
nError = AllocatePatchInfo(hf, true);
if(nError != ERROR_SUCCESS || hf->pPatchInfo == NULL)
{
SetLastError(nError);
return false;
}
}
// Clear the last used compression
hf->dwCompression0 = 0;
// If the file is local file, read the data directly from the stream
if(hf->pStream != NULL)
{
nError = ReadMpqFileLocalFile(hf, pvBuffer, hf->dwFilePos, dwToRead, &dwBytesRead);
}
// If the file is a patch file, we have to read it special way
else if(hf->hfPatch != NULL && (hf->pFileEntry->dwFlags & MPQ_FILE_PATCH_FILE) == 0)
{
nError = ReadMpqFilePatchFile(hf, pvBuffer, hf->dwFilePos, dwToRead, &dwBytesRead);
}
// If the archive is a MPK archive, we need special way to read the file
else if(hf->ha->dwSubType == MPQ_SUBTYPE_MPK)
{
nError = ReadMpkFileSingleUnit(hf, pvBuffer, hf->dwFilePos, dwToRead, &dwBytesRead);
}
// If the file is single unit file, redirect it to read file
else if(hf->pFileEntry->dwFlags & MPQ_FILE_SINGLE_UNIT)
{
nError = ReadMpqFileSingleUnit(hf, pvBuffer, hf->dwFilePos, dwToRead, &dwBytesRead);
}
// Otherwise read it as sector based MPQ file
else
{
nError = ReadMpqFileSectorFile(hf, pvBuffer, hf->dwFilePos, dwToRead, &dwBytesRead);
}
// Increment the file position
hf->dwFilePos += dwBytesRead;
// Give the caller the number of bytes read
if(pdwRead != NULL)
*pdwRead = dwBytesRead;
// If the read operation succeeded, but not full number of bytes was read,
// set the last error to ERROR_HANDLE_EOF
if(nError == ERROR_SUCCESS && (dwBytesRead < dwToRead))
nError = ERROR_HANDLE_EOF;
// If something failed, set the last error value
if(nError != ERROR_SUCCESS)
SetLastError(nError);
return (nError == ERROR_SUCCESS);
}
