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