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Diffstat (limited to 'StormLib/src/SFileReadFile.cpp')
| -rw-r--r-- | StormLib/src/SFileReadFile.cpp | 897 |
1 files changed, 0 insertions, 897 deletions
diff --git a/StormLib/src/SFileReadFile.cpp b/StormLib/src/SFileReadFile.cpp deleted file mode 100644 index 34edc069f..000000000 --- a/StormLib/src/SFileReadFile.cpp +++ /dev/null @@ -1,897 +0,0 @@ -/*****************************************************************************/ -/* SFileReadFile.cpp Copyright (c) Ladislav Zezula 2003 */ -/*---------------------------------------------------------------------------*/ -/* Description : */ -/*---------------------------------------------------------------------------*/ -/* Date Ver Who Comment */ -/* -------- ---- --- ------- */ -/* xx.xx.99 1.00 Lad The first version of SFileReadFile.cpp */ -/* 24.03.99 1.00 Lad Added the SFileGetFileInfo function */ -/*****************************************************************************/ - -#define __STORMLIB_SELF__ -#include "StormLib.h" -#include "StormCommon.h" - -//----------------------------------------------------------------------------- -// Local functions - -// hf - MPQ File handle. -// pbBuffer - Pointer to target buffer to store sectors. -// dwByteOffset - Position of sector in the file (relative to file begin) -// dwBytesToRead - Number of bytes to read. Must be multiplier of sector size. -// pdwBytesRead - Stored number of bytes loaded -static DWORD ReadMpqSectors(TMPQFile * hf, LPBYTE pbBuffer, DWORD dwByteOffset, DWORD dwBytesToRead, LPDWORD pdwBytesRead) -{ - ULONGLONG RawFilePos; - TMPQArchive * ha = hf->ha; - TFileEntry * pFileEntry = hf->pFileEntry; - LPBYTE pbRawSector = NULL; - LPBYTE pbOutSector = pbBuffer; - LPBYTE pbInSector = pbBuffer; - DWORD dwRawBytesToRead; - DWORD dwRawSectorOffset = dwByteOffset; - DWORD dwSectorsToRead = dwBytesToRead / ha->dwSectorSize; - DWORD dwSectorIndex = dwByteOffset / ha->dwSectorSize; - DWORD dwSectorsDone = 0; - DWORD dwBytesRead = 0; - DWORD dwErrCode = ERROR_SUCCESS; - - // Note that dwByteOffset must be aligned to size of one sector - // Note that dwBytesToRead must be a multiplier of one sector size - // This is local function, so we won't check if that's true. - // Note that files stored in single units are processed by a separate function - - // If there is not enough bytes remaining, cut dwBytesToRead - if((dwByteOffset + dwBytesToRead) > hf->dwDataSize) - dwBytesToRead = hf->dwDataSize - dwByteOffset; - dwRawBytesToRead = dwBytesToRead; - - // Perform all necessary work to do with compressed files - if(pFileEntry->dwFlags & MPQ_FILE_COMPRESS_MASK) - { - // If the sector positions are not loaded yet, do it - if(hf->SectorOffsets == NULL) - { - dwErrCode = AllocateSectorOffsets(hf, true); - if(dwErrCode != ERROR_SUCCESS || hf->SectorOffsets == NULL) - return dwErrCode; - } - - // If the sector checksums are not loaded yet, load them now. - if(hf->SectorChksums == NULL && (pFileEntry->dwFlags & MPQ_FILE_SECTOR_CRC) && hf->bLoadedSectorCRCs == false) - { - // - // Sector CRCs is plain crap feature. It is almost never present, - // often it's empty, or the end offset of sector CRCs is zero. - // We only try to load sector CRCs once, and regardless if it fails - // or not, we won't try that again for the given file. - // - - AllocateSectorChecksums(hf, true); - hf->bLoadedSectorCRCs = true; - } - - // TODO: If the raw data MD5s are not loaded yet, load them now - // Only do it if the MPQ is of format 4.0 -// if(ha->pHeader->wFormatVersion >= MPQ_FORMAT_VERSION_4 && ha->pHeader->dwRawChunkSize != 0) -// { -// dwErrCode = AllocateRawMD5s(hf, true); -// if(dwErrCode != ERROR_SUCCESS) -// return dwErrCode; -// } - - // Assign the temporary buffer as target for read operation - dwRawSectorOffset = hf->SectorOffsets[dwSectorIndex]; - dwRawBytesToRead = hf->SectorOffsets[dwSectorIndex + dwSectorsToRead] - dwRawSectorOffset; - - // If the file is compressed, also allocate secondary buffer - pbInSector = pbRawSector = STORM_ALLOC(BYTE, dwRawBytesToRead); - if(pbRawSector == NULL) - return ERROR_NOT_ENOUGH_MEMORY; - } - - // Calculate raw file offset where the sector(s) are stored. - RawFilePos = CalculateRawSectorOffset(hf, dwRawSectorOffset); - - // Set file pointer and read all required sectors - if(FileStream_Read(ha->pStream, &RawFilePos, pbInSector, dwRawBytesToRead)) - { - // Now we have to decrypt and decompress all file sectors that have been loaded - for(DWORD i = 0; i < dwSectorsToRead; i++) - { - DWORD dwRawBytesInThisSector = ha->dwSectorSize; - DWORD dwBytesInThisSector = ha->dwSectorSize; - DWORD dwIndex = dwSectorIndex + i; - - // If there is not enough bytes in the last sector, - // cut the number of bytes in this sector - if(dwRawBytesInThisSector > dwBytesToRead) - dwRawBytesInThisSector = dwBytesToRead; - if(dwBytesInThisSector > dwBytesToRead) - dwBytesInThisSector = dwBytesToRead; - - // If the file is compressed, we have to adjust the raw sector size - if(pFileEntry->dwFlags & MPQ_FILE_COMPRESS_MASK) - dwRawBytesInThisSector = hf->SectorOffsets[dwIndex + 1] - hf->SectorOffsets[dwIndex]; - - // If the file is encrypted, we have to decrypt the sector - if(pFileEntry->dwFlags & MPQ_FILE_ENCRYPTED) - { - BSWAP_ARRAY32_UNSIGNED(pbInSector, dwRawBytesInThisSector); - - // If we don't know the key, try to detect it by file content - if(hf->dwFileKey == 0) - { - hf->dwFileKey = DetectFileKeyByContent(pbInSector, dwBytesInThisSector, hf->dwDataSize); - if(hf->dwFileKey == 0) - { - dwErrCode = ERROR_UNKNOWN_FILE_KEY; - break; - } - } - - DecryptMpqBlock(pbInSector, dwRawBytesInThisSector, hf->dwFileKey + dwIndex); - BSWAP_ARRAY32_UNSIGNED(pbInSector, dwRawBytesInThisSector); - } - - // If the file has sector CRC check turned on, perform it - if(hf->bCheckSectorCRCs && hf->SectorChksums != NULL) - { - DWORD dwAdlerExpected = hf->SectorChksums[dwIndex]; - DWORD dwAdlerValue = 0; - - // We can only check sector CRC when it's not zero - // Neither can we check it if it's 0xFFFFFFFF. - if(dwAdlerExpected != 0 && dwAdlerExpected != 0xFFFFFFFF) - { - dwAdlerValue = adler32(0, pbInSector, dwRawBytesInThisSector); - if(dwAdlerValue != dwAdlerExpected) - { - dwErrCode = ERROR_CHECKSUM_ERROR; - break; - } - } - } - - // If the sector is really compressed, decompress it. - // WARNING : Some sectors may not be compressed, it can be determined only - // by comparing uncompressed and compressed size !!! - if(dwRawBytesInThisSector < dwBytesInThisSector) - { - int cbOutSector = dwBytesInThisSector; - int cbInSector = dwRawBytesInThisSector; - int nResult = 0; - - // Is the file compressed by Blizzard's multiple compression ? - if(pFileEntry->dwFlags & MPQ_FILE_COMPRESS) - { - // Remember the last used compression - hf->dwCompression0 = pbInSector[0]; - - // Decompress the data - if(ha->pHeader->wFormatVersion >= MPQ_FORMAT_VERSION_2) - nResult = SCompDecompress2(pbOutSector, &cbOutSector, pbInSector, cbInSector); - else - nResult = SCompDecompress(pbOutSector, &cbOutSector, pbInSector, cbInSector); - } - - // Is the file compressed by PKWARE Data Compression Library ? - else if(pFileEntry->dwFlags & MPQ_FILE_IMPLODE) - { - nResult = SCompExplode(pbOutSector, &cbOutSector, pbInSector, cbInSector); - } - - // Did the decompression fail ? - if(nResult == 0) - { - dwErrCode = ERROR_FILE_CORRUPT; - break; - } - } - else - { - if(pbOutSector != pbInSector) - memcpy(pbOutSector, pbInSector, dwBytesInThisSector); - } - - // Move pointers - dwBytesToRead -= dwBytesInThisSector; - dwByteOffset += dwBytesInThisSector; - dwBytesRead += dwBytesInThisSector; - pbOutSector += dwBytesInThisSector; - pbInSector += dwRawBytesInThisSector; - dwSectorsDone++; - } - } - else - { - dwErrCode = GetLastError(); - } - - // Free all used buffers - if(pbRawSector != NULL) - STORM_FREE(pbRawSector); - - // Give the caller thenumber of bytes read - *pdwBytesRead = dwBytesRead; - return dwErrCode; -} - -static DWORD ReadMpqFileSingleUnit(TMPQFile * hf, void * pvBuffer, DWORD dwFilePos, DWORD dwToRead, LPDWORD pdwBytesRead) -{ - ULONGLONG RawFilePos = hf->RawFilePos; - TMPQArchive * ha = hf->ha; - TFileEntry * pFileEntry = hf->pFileEntry; - LPBYTE pbCompressed = NULL; - LPBYTE pbRawData; - DWORD dwErrCode = ERROR_SUCCESS; - - // If the file buffer is not allocated yet, do it. - if(hf->pbFileSector == NULL) - { - dwErrCode = AllocateSectorBuffer(hf); - if(dwErrCode != ERROR_SUCCESS || hf->pbFileSector == NULL) - return dwErrCode; - } - - // If the file is a patch file, adjust raw data offset - if(hf->pPatchInfo != NULL) - RawFilePos += hf->pPatchInfo->dwLength; - pbRawData = hf->pbFileSector; - - // If the file sector is not loaded yet, do it - if(hf->dwSectorOffs != 0) - { - // Is the file compressed? - if(pFileEntry->dwFlags & MPQ_FILE_COMPRESS_MASK) - { - // Allocate space for compressed data - pbCompressed = STORM_ALLOC(BYTE, pFileEntry->dwCmpSize); - if(pbCompressed == NULL) - return ERROR_NOT_ENOUGH_MEMORY; - pbRawData = pbCompressed; - } - - // Load the raw (compressed, encrypted) data - if(!FileStream_Read(ha->pStream, &RawFilePos, pbRawData, pFileEntry->dwCmpSize)) - { - STORM_FREE(pbCompressed); - return GetLastError(); - } - - // If the file is encrypted, we have to decrypt the data first - if(pFileEntry->dwFlags & MPQ_FILE_ENCRYPTED) - { - BSWAP_ARRAY32_UNSIGNED(pbRawData, pFileEntry->dwCmpSize); - DecryptMpqBlock(pbRawData, pFileEntry->dwCmpSize, hf->dwFileKey); - BSWAP_ARRAY32_UNSIGNED(pbRawData, pFileEntry->dwCmpSize); - } - - // If the file is compressed, we have to decompress it now - if(pFileEntry->dwFlags & MPQ_FILE_COMPRESS_MASK) - { - int cbOutBuffer = (int)hf->dwDataSize; - int cbInBuffer = (int)pFileEntry->dwCmpSize; - int nResult = 0; - - // - // If the file is an incremental patch, the size of compressed data - // is determined as pFileEntry->dwCmpSize - sizeof(TPatchInfo) - // - // In "wow-update-12694.MPQ" from Wow-Cataclysm BETA: - // - // File CmprSize DcmpSize DataSize Compressed? - // -------------------------------------- ---------- -------- -------- --------------- - // esES\DBFilesClient\LightSkyBox.dbc 0xBE->0xA2 0xBC 0xBC Yes - // deDE\DBFilesClient\MountCapability.dbc 0x93->0x77 0x77 0x77 No - // - - if(pFileEntry->dwFlags & MPQ_FILE_PATCH_FILE) - cbInBuffer = cbInBuffer - sizeof(TPatchInfo); - - // Is the file compressed by Blizzard's multiple compression ? - if(pFileEntry->dwFlags & MPQ_FILE_COMPRESS) - { - // Remember the last used compression - hf->dwCompression0 = pbRawData[0]; - - // Decompress the file - if(ha->pHeader->wFormatVersion >= MPQ_FORMAT_VERSION_2) - nResult = SCompDecompress2(hf->pbFileSector, &cbOutBuffer, pbRawData, cbInBuffer); - else - nResult = SCompDecompress(hf->pbFileSector, &cbOutBuffer, pbRawData, cbInBuffer); - } - - // Is the file compressed by PKWARE Data Compression Library ? - // Note: Single unit files compressed with IMPLODE are not supported by Blizzard - else if(pFileEntry->dwFlags & MPQ_FILE_IMPLODE) - nResult = SCompExplode(hf->pbFileSector, &cbOutBuffer, pbRawData, cbInBuffer); - - dwErrCode = (nResult != 0) ? ERROR_SUCCESS : ERROR_FILE_CORRUPT; - } - else - { - if(hf->pbFileSector != NULL && pbRawData != hf->pbFileSector) - memcpy(hf->pbFileSector, pbRawData, hf->dwDataSize); - } - - // Free the decompression buffer. - if(pbCompressed != NULL) - STORM_FREE(pbCompressed); - - // The file sector is now properly loaded - hf->dwSectorOffs = 0; - } - - // At this moment, we have the file loaded into the file buffer. - // Copy as much as the caller wants - if(dwErrCode == ERROR_SUCCESS && hf->dwSectorOffs == 0) - { - // File position is greater or equal to file size ? - if(dwFilePos >= hf->dwDataSize) - { - *pdwBytesRead = 0; - return ERROR_SUCCESS; - } - - // If not enough bytes remaining in the file, cut them - if((hf->dwDataSize - dwFilePos) < dwToRead) - dwToRead = (hf->dwDataSize - dwFilePos); - - // Copy the bytes - memcpy(pvBuffer, hf->pbFileSector + dwFilePos, dwToRead); - - // Give the number of bytes read - *pdwBytesRead = dwToRead; - } - - // An error, sorry - return dwErrCode; -} - -static DWORD ReadMpkFileSingleUnit(TMPQFile * hf, void * pvBuffer, DWORD dwFilePos, DWORD dwToRead, LPDWORD pdwBytesRead) -{ - ULONGLONG RawFilePos = hf->RawFilePos + 0x0C; // For some reason, MPK files start at position (hf->RawFilePos + 0x0C) - TMPQArchive * ha = hf->ha; - TFileEntry * pFileEntry = hf->pFileEntry; - LPBYTE pbCompressed = NULL; - LPBYTE pbRawData = hf->pbFileSector; - DWORD dwErrCode = ERROR_SUCCESS; - - // We do not support patch files in MPK archives - assert(hf->pPatchInfo == NULL); - - // If the file buffer is not allocated yet, do it. - if(hf->pbFileSector == NULL) - { - dwErrCode = AllocateSectorBuffer(hf); - if(dwErrCode != ERROR_SUCCESS || hf->pbFileSector == NULL) - return dwErrCode; - pbRawData = hf->pbFileSector; - } - - // If the file sector is not loaded yet, do it - if(hf->dwSectorOffs != 0) - { - // Is the file compressed? - if(pFileEntry->dwFlags & MPQ_FILE_COMPRESS_MASK) - { - // Allocate space for compressed data - pbCompressed = STORM_ALLOC(BYTE, pFileEntry->dwCmpSize); - if(pbCompressed == NULL) - return ERROR_NOT_ENOUGH_MEMORY; - pbRawData = pbCompressed; - } - - // Load the raw (compressed, encrypted) data - if(!FileStream_Read(ha->pStream, &RawFilePos, pbRawData, pFileEntry->dwCmpSize)) - { - STORM_FREE(pbCompressed); - return GetLastError(); - } - - // If the file is encrypted, we have to decrypt the data first - if(pFileEntry->dwFlags & MPQ_FILE_ENCRYPTED) - { - DecryptMpkTable(pbRawData, pFileEntry->dwCmpSize); - } - - // If the file is compressed, we have to decompress it now - if(pFileEntry->dwFlags & MPQ_FILE_COMPRESS_MASK) - { - int cbOutBuffer = (int)hf->dwDataSize; - - hf->dwCompression0 = pbRawData[0]; - if(!SCompDecompressMpk(hf->pbFileSector, &cbOutBuffer, pbRawData, (int)pFileEntry->dwCmpSize)) - dwErrCode = ERROR_FILE_CORRUPT; - } - else - { - if(pbRawData != hf->pbFileSector) - memcpy(hf->pbFileSector, pbRawData, hf->dwDataSize); - } - - // Free the decompression buffer. - if(pbCompressed != NULL) - STORM_FREE(pbCompressed); - - // The file sector is now properly loaded - hf->dwSectorOffs = 0; - } - - // At this moment, we have the file loaded into the file buffer. - // Copy as much as the caller wants - if(dwErrCode == ERROR_SUCCESS && hf->dwSectorOffs == 0) - { - // File position is greater or equal to file size ? - if(dwFilePos >= hf->dwDataSize) - { - *pdwBytesRead = 0; - return ERROR_SUCCESS; - } - - // If not enough bytes remaining in the file, cut them - if((hf->dwDataSize - dwFilePos) < dwToRead) - dwToRead = (hf->dwDataSize - dwFilePos); - - // Copy the bytes - memcpy(pvBuffer, hf->pbFileSector + dwFilePos, dwToRead); - - // Give the number of bytes read - *pdwBytesRead = dwToRead; - return ERROR_SUCCESS; - } - - // An error, sorry - return ERROR_CAN_NOT_COMPLETE; -} - - -static DWORD ReadMpqFileSectorFile(TMPQFile * hf, void * pvBuffer, DWORD dwFilePos, DWORD dwBytesToRead, LPDWORD pdwBytesRead) -{ - TMPQArchive * ha = hf->ha; - LPBYTE pbBuffer = (BYTE *)pvBuffer; - DWORD dwTotalBytesRead = 0; // Total bytes read in all three parts - DWORD dwSectorSizeMask = ha->dwSectorSize - 1; // Mask for block size, usually 0x0FFF - DWORD dwFileSectorPos; // File offset of the loaded sector - DWORD dwBytesRead; // Number of bytes read (temporary variable) - DWORD dwErrCode; - - // If the file position is at or beyond end of file, do nothing - if(dwFilePos >= hf->dwDataSize) - { - *pdwBytesRead = 0; - return ERROR_SUCCESS; - } - - // If not enough bytes in the file remaining, cut them - if(dwBytesToRead > (hf->dwDataSize - dwFilePos)) - dwBytesToRead = (hf->dwDataSize - dwFilePos); - - // Compute sector position in the file - dwFileSectorPos = dwFilePos & ~dwSectorSizeMask; // Position in the block - - // If the file sector buffer is not allocated yet, do it now - if(hf->pbFileSector == NULL) - { - dwErrCode = AllocateSectorBuffer(hf); - if(dwErrCode != ERROR_SUCCESS || hf->pbFileSector == NULL) - return dwErrCode; - } - - // Load the first (incomplete) file sector - if(dwFilePos & dwSectorSizeMask) - { - DWORD dwBytesInSector = ha->dwSectorSize; - DWORD dwBufferOffs = dwFilePos & dwSectorSizeMask; - DWORD dwToCopy; - - // Is the file sector already loaded ? - if(hf->dwSectorOffs != dwFileSectorPos) - { - // Load one MPQ sector into archive buffer - dwErrCode = ReadMpqSectors(hf, hf->pbFileSector, dwFileSectorPos, ha->dwSectorSize, &dwBytesInSector); - if(dwErrCode != ERROR_SUCCESS) - return dwErrCode; - - // Remember that the data loaded to the sector have new file offset - hf->dwSectorOffs = dwFileSectorPos; - } - else - { - if((dwFileSectorPos + dwBytesInSector) > hf->dwDataSize) - dwBytesInSector = hf->dwDataSize - dwFileSectorPos; - } - - // Copy the data from the offset in the loaded sector to the end of the sector - dwToCopy = dwBytesInSector - dwBufferOffs; - if(dwToCopy > dwBytesToRead) - dwToCopy = dwBytesToRead; - - // Copy data from sector buffer into target buffer - memcpy(pbBuffer, hf->pbFileSector + dwBufferOffs, dwToCopy); - - // Update pointers and byte counts - dwTotalBytesRead += dwToCopy; - dwFileSectorPos += dwBytesInSector; - pbBuffer += dwToCopy; - dwBytesToRead -= dwToCopy; - } - - // Load the whole ("middle") sectors only if there is at least one full sector to be read - if(dwBytesToRead >= ha->dwSectorSize) - { - DWORD dwBlockBytes = dwBytesToRead & ~dwSectorSizeMask; - - // Load all sectors to the output buffer - dwErrCode = ReadMpqSectors(hf, pbBuffer, dwFileSectorPos, dwBlockBytes, &dwBytesRead); - if(dwErrCode != ERROR_SUCCESS) - return dwErrCode; - - // Update pointers - dwTotalBytesRead += dwBytesRead; - dwFileSectorPos += dwBytesRead; - pbBuffer += dwBytesRead; - dwBytesToRead -= dwBytesRead; - } - - // Read the terminating sector - if(dwBytesToRead > 0) - { - DWORD dwToCopy = ha->dwSectorSize; - - // Is the file sector already loaded ? - if(hf->dwSectorOffs != dwFileSectorPos) - { - // Load one MPQ sector into archive buffer - dwErrCode = ReadMpqSectors(hf, hf->pbFileSector, dwFileSectorPos, ha->dwSectorSize, &dwBytesRead); - if(dwErrCode != ERROR_SUCCESS) - return dwErrCode; - - // Remember that the data loaded to the sector have new file offset - hf->dwSectorOffs = dwFileSectorPos; - } - - // Check number of bytes read - if(dwToCopy > dwBytesToRead) - dwToCopy = dwBytesToRead; - - // Copy the data from the cached last sector to the caller's buffer - memcpy(pbBuffer, hf->pbFileSector, dwToCopy); - - // Update pointers - dwTotalBytesRead += dwToCopy; - } - - // Store total number of bytes read to the caller - *pdwBytesRead = dwTotalBytesRead; - return ERROR_SUCCESS; -} - -static DWORD ReadMpqFilePatchFile(TMPQFile * hf, void * pvBuffer, DWORD dwFilePos, DWORD dwToRead, LPDWORD pdwBytesRead) -{ - TMPQPatcher Patcher; - DWORD dwBytesToRead = dwToRead; - DWORD dwBytesRead = 0; - DWORD dwErrCode = ERROR_SUCCESS; - - // Make sure that the patch file is loaded completely - if(dwErrCode == ERROR_SUCCESS && hf->pbFileData == NULL) - { - // Initialize patching process and allocate data - dwErrCode = Patch_InitPatcher(&Patcher, hf); - if(dwErrCode != ERROR_SUCCESS) - return dwErrCode; - - // Set the current data size - Patcher.cbFileData = hf->pFileEntry->dwFileSize; - - // Initialize the patcher object with initial file data - if(hf->pFileEntry->dwFlags & MPQ_FILE_SINGLE_UNIT) - dwErrCode = ReadMpqFileSingleUnit(hf, Patcher.pbFileData1, 0, Patcher.cbFileData, &dwBytesRead); - else - dwErrCode = ReadMpqFileSectorFile(hf, Patcher.pbFileData1, 0, Patcher.cbFileData, &dwBytesRead); - - // Perform the patching process - if(dwErrCode == ERROR_SUCCESS) - dwErrCode = Patch_Process(&Patcher, hf); - - // Finalize the patcher structure - Patch_Finalize(&Patcher); - dwBytesRead = 0; - } - - // If there is something to read, do it - if(dwErrCode == ERROR_SUCCESS) - { - if(dwFilePos < hf->cbFileData) - { - // Make sure we don't copy more than file size - if((dwFilePos + dwToRead) > hf->cbFileData) - dwToRead = hf->cbFileData - dwFilePos; - - // Copy the appropriate amount of the file data to the caller's buffer - memcpy(pvBuffer, hf->pbFileData + dwFilePos, dwToRead); - dwBytesRead = dwToRead; - } - - // Set the proper error code - dwErrCode = (dwBytesRead == dwBytesToRead) ? ERROR_SUCCESS : ERROR_HANDLE_EOF; - } - - // Give the result to the caller - if(pdwBytesRead != NULL) - *pdwBytesRead = dwBytesRead; - return dwErrCode; -} - -static DWORD ReadMpqFileLocalFile(TMPQFile * hf, void * pvBuffer, DWORD dwFilePos, DWORD dwToRead, LPDWORD pdwBytesRead) -{ - ULONGLONG FilePosition1 = dwFilePos; - ULONGLONG FilePosition2; - DWORD dwBytesRead = 0; - DWORD dwErrCode = ERROR_SUCCESS; - - assert(hf->pStream != NULL); - - // 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 - - if(!FileStream_Read(hf->pStream, &FilePosition1, pvBuffer, dwToRead)) - { - // If not all bytes have been read, then return the number of bytes read - if((dwErrCode = GetLastError()) == ERROR_HANDLE_EOF) - { - FileStream_GetPos(hf->pStream, &FilePosition2); - dwBytesRead = (DWORD)(FilePosition2 - FilePosition1); - } - } - else - { - dwBytesRead = dwToRead; - } - - *pdwBytesRead = dwBytesRead; - return dwErrCode; -} - -//----------------------------------------------------------------------------- -// SFileReadFile - -bool WINAPI SFileReadFile(HANDLE hFile, void * pvBuffer, DWORD dwToRead, LPDWORD pdwRead, LPOVERLAPPED lpOverlapped) -{ - TMPQFile * hf = (TMPQFile *)hFile; - DWORD dwBytesRead = 0; // Number of bytes read - DWORD dwErrCode = 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) - { - dwErrCode = AllocatePatchInfo(hf, true); - if(dwErrCode != ERROR_SUCCESS || hf->pPatchInfo == NULL) - { - SetLastError(dwErrCode); - 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) - { - dwErrCode = 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) - { - dwErrCode = 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) - { - dwErrCode = 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) - { - dwErrCode = ReadMpqFileSingleUnit(hf, pvBuffer, hf->dwFilePos, dwToRead, &dwBytesRead); - } - - // Otherwise read it as sector based MPQ file - else - { - dwErrCode = 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(dwErrCode == ERROR_SUCCESS && (dwBytesRead < dwToRead)) - dwErrCode = ERROR_HANDLE_EOF; - - // If something failed, set the last error value - if(dwErrCode != ERROR_SUCCESS) - SetLastError(dwErrCode); - return (dwErrCode == ERROR_SUCCESS); -} - -//----------------------------------------------------------------------------- -// SFileGetFileSize - -DWORD WINAPI SFileGetFileSize(HANDLE hFile, LPDWORD pdwFileSizeHigh) -{ - ULONGLONG FileSize; - TMPQFile * hf = (TMPQFile *)hFile; - - // Validate the file handle before we go on - if(IsValidFileHandle(hFile)) - { - // Make sure that the variable is initialized - FileSize = 0; - - // If the file is patched file, we have to get the size of the last version - if(hf->hfPatch != NULL) - { - // Walk through the entire patch chain, take the last version - while(hf != NULL) - { - // Get the size of the currently pointed version - FileSize = hf->pFileEntry->dwFileSize; - - // Move to the next patch file in the hierarchy - hf = hf->hfPatch; - } - } - else - { - // Is it a local file ? - if(hf->pStream != NULL) - { - FileStream_GetSize(hf->pStream, &FileSize); - } - else - { - FileSize = hf->dwDataSize; - } - } - - // If opened from archive, return file size - if(pdwFileSizeHigh != NULL) - *pdwFileSizeHigh = (DWORD)(FileSize >> 32); - return (DWORD)FileSize; - } - - SetLastError(ERROR_INVALID_HANDLE); - return SFILE_INVALID_SIZE; -} - -DWORD WINAPI SFileSetFilePointer(HANDLE hFile, LONG lFilePos, LONG * plFilePosHigh, DWORD dwMoveMethod) -{ - TMPQFile * hf = (TMPQFile *)hFile; - ULONGLONG OldPosition; - ULONGLONG NewPosition; - ULONGLONG FileSize; - ULONGLONG DeltaPos; - - // If the hFile is not a valid file handle, return an error. - if(!IsValidFileHandle(hFile)) - { - SetLastError(ERROR_INVALID_HANDLE); - return SFILE_INVALID_POS; - } - - // Retrieve the file size for handling the limits - if(hf->pStream != NULL) - { - FileStream_GetSize(hf->pStream, &FileSize); - } - else - { - FileSize = SFileGetFileSize(hFile, NULL); - } - - // Handle the NULL and non-NULL values of plFilePosHigh - // Non-NULL: The DeltaPos is combined from lFilePos and *lpFilePosHigh - // NULL: The DeltaPos is sign-extended value of lFilePos - DeltaPos = (plFilePosHigh != NULL) ? MAKE_OFFSET64(plFilePosHigh[0], lFilePos) : (ULONGLONG)(LONGLONG)lFilePos; - - // Get the relative point where to move from - switch(dwMoveMethod) - { - case FILE_BEGIN: - - // Move relative to the file begin. - OldPosition = 0; - break; - - case FILE_CURRENT: - - // Retrieve the current file position - if(hf->pStream != NULL) - { - FileStream_GetPos(hf->pStream, &OldPosition); - } - else - { - OldPosition = hf->dwFilePos; - } - break; - - case FILE_END: - - // Move relative to the end of the file - OldPosition = FileSize; - break; - - default: - SetLastError(ERROR_INVALID_PARAMETER); - return SFILE_INVALID_POS; - } - - // Calculate the new position - NewPosition = OldPosition + DeltaPos; - - // If moving backward, don't allow the new position go negative - if((LONGLONG)DeltaPos < 0) - { - if(NewPosition > FileSize) // Position is negative - { - SetLastError(ERROR_NEGATIVE_SEEK); - return SFILE_INVALID_POS; - } - } - - // If moving forward, don't allow the new position go past the end of the file - else - { - if(NewPosition > FileSize) - NewPosition = FileSize; - } - - // Now apply the file pointer to the file - if(hf->pStream != NULL) - { - if(!FileStream_Read(hf->pStream, &NewPosition, NULL, 0)) - return SFILE_INVALID_POS; - } - - // Also, store the new file position to the TMPQFile struct - hf->dwFilePos = (DWORD)NewPosition; - - // Return the new file position - if(plFilePosHigh != NULL) - *plFilePosHigh = (LONG)(NewPosition >> 32); - return (DWORD)NewPosition; -} |