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 unPackSize = SzFolderGetUnPackSize(folder);
#ifndef _LZMA_IN_CB
CFileSize packSize = SzArDbGetFolderFullPackSize(db, folderIndex);
Byte *inBuffer = 0;
size_t processedSize;
#endif
*blockIndex = folderIndex;
allocMain->Free(*outBuffer);
*outBuffer = 0;
RINOK(inStream->Seek(inStream, SzArDbGetFolderStreamPos(db, folderIndex, 0)));
#ifndef _LZMA_IN_CB
if (packSize != 0)
{
inBuffer = (Byte *)allocTemp->Alloc((size_t)packSize);
if (inBuffer == 0)
return SZE_OUTOFMEMORY;
}
res = inStream->Read(inStream, inBuffer, (size_t)packSize, &processedSize);
if (res == SZ_OK && processedSize != (size_t)packSize)
res = SZE_FAIL;
#endif
if (res == SZ_OK)
{
*outBufferSize = (size_t)unPackSize;
if (unPackSize != 0)
{
*outBuffer = (Byte *)allocMain->Alloc((size_t)unPackSize);
if (*outBuffer == 0)
res = SZE_OUTOFMEMORY;
}
if (res == SZ_OK)
{
size_t outRealSize;
res = SzDecode(db->Database.PackSizes +
db->FolderStartPackStreamIndex[folderIndex], folder,
#ifdef _LZMA_IN_CB
inStream,
#else
inBuffer,
#endif
*outBuffer, (size_t)unPackSize, &outRealSize, allocTemp);
if (res == SZ_OK)
{
if (outRealSize == (size_t)unPackSize)
{
if (folder->UnPackCRCDefined)
{
if (!CrcVerifyDigest(folder->UnPackCRC, *outBuffer, (size_t)unPackSize))
res = SZE_FAIL;
}
}
else
res = SZE_FAIL;
}
}
}
#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 (!CrcVerifyDigest(fileItem->FileCRC, *outBuffer + *offset, *outSizeProcessed))
res = SZE_FAIL;
}
}
}
return res;
}