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devilutionX/3rdParty/StormLib/src/SFileReadFile.cpp

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/*****************************************************************************/
/* 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 int 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;
int nError = 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)
{
nError = AllocateSectorOffsets(hf, true);
if(nError != ERROR_SUCCESS || hf->SectorOffsets == NULL)
return nError;
}
// 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)
// {
// nError = AllocateRawMD5s(hf, true);
// if(nError != ERROR_SUCCESS)
// return nError;
// }
// 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)
{
nError = ERROR_UNKNOWN_FILE_KEY;
break;
}
}
DecryptMpqBlock(pbInSector, dwRawBytesInThisSector, hf->dwFileKey + dwIndex);
BSWAP_ARRAY32_UNSIGNED(pbInSector, dwRawBytesInThisSector);
}
#ifdef FULL
// 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)
{
nError = ERROR_CHECKSUM_ERROR;
break;
}
}
}
#endif
// 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)
{
nError = 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
{
nError = GetLastError();
}
// Free all used buffers
if(pbRawSector != NULL)
STORM_FREE(pbRawSector);
// Give the caller thenumber of bytes read
*pdwBytesRead = dwBytesRead;
return nError;
}
static int 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;
int nError = ERROR_SUCCESS;
// If the file buffer is not allocated yet, do it.
if(hf->pbFileSector == NULL)
{
nError = AllocateSectorBuffer(hf);
if(nError != ERROR_SUCCESS || hf->pbFileSector == NULL)
return nError;
}
// 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);
nError = (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(nError == 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 int 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;
int nError = 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)
{
nError = AllocateSectorBuffer(hf);
if(nError != ERROR_SUCCESS || hf->pbFileSector == NULL)
return nError;
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)
{
#ifdef FULL
int cbOutBuffer = (int)hf->dwDataSize;
hf->dwCompression0 = pbRawData[0];
if(!SCompDecompressMpk(hf->pbFileSector, &cbOutBuffer, pbRawData, (int)pFileEntry->dwCmpSize))
nError = ERROR_FILE_CORRUPT;
#else
assert(0);
#endif
}
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(nError == 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 int 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)
int nError;
// 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)
{
nError = AllocateSectorBuffer(hf);
if(nError != ERROR_SUCCESS || hf->pbFileSector == NULL)
return nError;
}
// 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
nError = ReadMpqSectors(hf, hf->pbFileSector, dwFileSectorPos, ha->dwSectorSize, &dwBytesInSector);
if(nError != ERROR_SUCCESS)
return nError;
// 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
nError = ReadMpqSectors(hf, pbBuffer, dwFileSectorPos, dwBlockBytes, &dwBytesRead);
if(nError != ERROR_SUCCESS)
return nError;
// 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
nError = ReadMpqSectors(hf, hf->pbFileSector, dwFileSectorPos, ha->dwSectorSize, &dwBytesRead);
if(nError != ERROR_SUCCESS)
return nError;
// 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;
}
#ifdef FULL
static int ReadMpqFilePatchFile(TMPQFile * hf, void * pvBuffer, DWORD dwFilePos, DWORD dwToRead, LPDWORD pdwBytesRead)
{
TMPQPatcher Patcher;
DWORD dwBytesToRead = dwToRead;
DWORD dwBytesRead = 0;
int nError = ERROR_SUCCESS;
// Make sure that the patch file is loaded completely
if(nError == ERROR_SUCCESS && hf->pbFileData == NULL)
{
// Initialize patching process and allocate data
nError = Patch_InitPatcher(&Patcher, hf);
if(nError != ERROR_SUCCESS)
return nError;
// 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)
nError = ReadMpqFileSingleUnit(hf, Patcher.pbFileData1, 0, Patcher.cbFileData, &dwBytesRead);
else
nError = ReadMpqFileSectorFile(hf, Patcher.pbFileData1, 0, Patcher.cbFileData, &dwBytesRead);
// Perform the patching process
if(nError == ERROR_SUCCESS)
nError = Patch_Process(&Patcher, hf);
// Finalize the patcher structure
Patch_Finalize(&Patcher);
dwBytesRead = 0;
}
// If there is something to read, do it
if(nError == 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
nError = (dwBytesRead == dwBytesToRead) ? ERROR_SUCCESS : ERROR_HANDLE_EOF;
}
// Give the result to the caller
if(pdwBytesRead != NULL)
*pdwBytesRead = dwBytesRead;
return nError;
}
#endif
static int ReadMpqFileLocalFile(TMPQFile * hf, void * pvBuffer, DWORD dwFilePos, DWORD dwToRead, LPDWORD pdwBytesRead)
{
ULONGLONG FilePosition1 = dwFilePos;
ULONGLONG FilePosition2;
DWORD dwBytesRead = 0;
int nError = 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((nError = GetLastError()) == ERROR_HANDLE_EOF)
{
FileStream_GetPos(hf->pStream, &FilePosition2);
dwBytesRead = (DWORD)(FilePosition2 - FilePosition1);
}
}
else
{
dwBytesRead = dwToRead;
}
*pdwBytesRead = dwBytesRead;
return nError;
}
//-----------------------------------------------------------------------------
// 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
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);
}
#ifdef FULL
// 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);
}
#endif
// 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);
}
//-----------------------------------------------------------------------------
// 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;
}
else
{
hf->dwFilePos = (DWORD)NewPosition;
}
// Return the new file position
if(plFilePosHigh != NULL)
*plFilePosHigh = (LONG)(NewPosition >> 32);
return (DWORD)NewPosition;
}