7zExtract.c
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/* 7zExtract.c */
#include "7zExtract.h"
#include "7zDecode.h"
#include "../../7zCrc.h"
SZ_RESULT SzExtract(
ISzInStream *inStream,
CArchiveDatabaseEx *db,
UInt32 fileIndex,
UInt32 *blockIndex,
Byte **outBuffer,
size_t *outBufferSize,
size_t *offset,
size_t *outSizeProcessed,
ISzAlloc *allocMain,
ISzAlloc *allocTemp)
{
UInt32 folderIndex = db->FileIndexToFolderIndexMap[fileIndex];
SZ_RESULT res = SZ_OK;
*offset = 0;
*outSizeProcessed = 0;
if (folderIndex == (UInt32)-1)
{
allocMain->Free(*outBuffer);
*blockIndex = folderIndex;
*outBuffer = 0;
*outBufferSize = 0;
return SZ_OK;
}
if (*outBuffer == 0 || *blockIndex != folderIndex)
{
CFolder *folder = db->Database.Folders + folderIndex;
CFileSize unPackSizeSpec = SzFolderGetUnPackSize(folder);
size_t unPackSize = (size_t)unPackSizeSpec;
CFileSize startOffset = SzArDbGetFolderStreamPos(db, folderIndex, 0);
#ifndef _LZMA_IN_CB
Byte *inBuffer = 0;
size_t processedSize;
CFileSize packSizeSpec;
size_t packSize;
RINOK(SzArDbGetFolderFullPackSize(db, folderIndex, &packSizeSpec));
packSize = (size_t)packSizeSpec;
if (packSize != packSizeSpec)
return SZE_OUTOFMEMORY;
#endif
if (unPackSize != unPackSizeSpec)
return SZE_OUTOFMEMORY;
*blockIndex = folderIndex;
allocMain->Free(*outBuffer);
*outBuffer = 0;
RINOK(inStream->Seek(inStream, startOffset));
#ifndef _LZMA_IN_CB
if (packSize != 0)
{
inBuffer = (Byte *)allocTemp->Alloc(packSize);
if (inBuffer == 0)
return SZE_OUTOFMEMORY;
}
res = inStream->Read(inStream, inBuffer, packSize, &processedSize);
if (res == SZ_OK && processedSize != packSize)
res = SZE_FAIL;
#endif
if (res == SZ_OK)
{
*outBufferSize = unPackSize;
if (unPackSize != 0)
{
*outBuffer = (Byte *)allocMain->Alloc(unPackSize);
if (*outBuffer == 0)
res = SZE_OUTOFMEMORY;
}
if (res == SZ_OK)
{
res = SzDecode(db->Database.PackSizes +
db->FolderStartPackStreamIndex[folderIndex], folder,
#ifdef _LZMA_IN_CB
inStream, startOffset,
#else
inBuffer,
#endif
*outBuffer, unPackSize, allocTemp);
if (res == SZ_OK)
{
if (folder->UnPackCRCDefined)
{
if (CrcCalc(*outBuffer, unPackSize) != folder->UnPackCRC)
res = SZE_CRC_ERROR;
}
}
}
}
#ifndef _LZMA_IN_CB
allocTemp->Free(inBuffer);
#endif
}
if (res == SZ_OK)
{
UInt32 i;
CFileItem *fileItem = db->Database.Files + fileIndex;
*offset = 0;
for(i = db->FolderStartFileIndex[folderIndex]; i < fileIndex; i++)
*offset += (UInt32)db->Database.Files[i].Size;
*outSizeProcessed = (size_t)fileItem->Size;
if (*offset + *outSizeProcessed > *outBufferSize)
return SZE_FAIL;
{
if (fileItem->IsFileCRCDefined)
{
if (CrcCalc(*outBuffer + *offset, *outSizeProcessed) != fileItem->FileCRC)
res = SZE_CRC_ERROR;
}
}
}
return res;
}