mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-30 15:52:09 +00:00
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/* 7zExtract.c -- Extracting from 7z archive
|
|
2008-11-23 : Igor Pavlov : Public domain */
|
|
|
|
#include "../../7zCrc.h"
|
|
#include "7zDecode.h"
|
|
#include "7zExtract.h"
|
|
|
|
SRes SzAr_Extract(
|
|
const CSzArEx *p,
|
|
ILookInStream *inStream,
|
|
UInt32 fileIndex,
|
|
UInt32 *blockIndex,
|
|
Byte **outBuffer,
|
|
size_t *outBufferSize,
|
|
size_t *offset,
|
|
size_t *outSizeProcessed,
|
|
ISzAlloc *allocMain,
|
|
ISzAlloc *allocTemp)
|
|
{
|
|
UInt32 folderIndex = p->FileIndexToFolderIndexMap[fileIndex];
|
|
SRes res = SZ_OK;
|
|
*offset = 0;
|
|
*outSizeProcessed = 0;
|
|
if (folderIndex == (UInt32)-1)
|
|
{
|
|
IAlloc_Free(allocMain, *outBuffer);
|
|
*blockIndex = folderIndex;
|
|
*outBuffer = 0;
|
|
*outBufferSize = 0;
|
|
return SZ_OK;
|
|
}
|
|
|
|
if (*outBuffer == 0 || *blockIndex != folderIndex)
|
|
{
|
|
CSzFolder *folder = p->db.Folders + folderIndex;
|
|
UInt64 unpackSizeSpec = SzFolder_GetUnpackSize(folder);
|
|
size_t unpackSize = (size_t)unpackSizeSpec;
|
|
UInt64 startOffset = SzArEx_GetFolderStreamPos(p, folderIndex, 0);
|
|
|
|
if (unpackSize != unpackSizeSpec)
|
|
return SZ_ERROR_MEM;
|
|
*blockIndex = folderIndex;
|
|
IAlloc_Free(allocMain, *outBuffer);
|
|
*outBuffer = 0;
|
|
|
|
RINOK(LookInStream_SeekTo(inStream, startOffset));
|
|
|
|
if (res == SZ_OK)
|
|
{
|
|
*outBufferSize = unpackSize;
|
|
if (unpackSize != 0)
|
|
{
|
|
*outBuffer = (Byte *)IAlloc_Alloc(allocMain, unpackSize);
|
|
if (*outBuffer == 0)
|
|
res = SZ_ERROR_MEM;
|
|
}
|
|
if (res == SZ_OK)
|
|
{
|
|
res = SzDecode(p->db.PackSizes +
|
|
p->FolderStartPackStreamIndex[folderIndex], folder,
|
|
inStream, startOffset,
|
|
*outBuffer, unpackSize, allocTemp);
|
|
if (res == SZ_OK)
|
|
{
|
|
if (folder->UnpackCRCDefined)
|
|
{
|
|
if (CrcCalc(*outBuffer, unpackSize) != folder->UnpackCRC)
|
|
res = SZ_ERROR_CRC;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (res == SZ_OK)
|
|
{
|
|
UInt32 i;
|
|
CSzFileItem *fileItem = p->db.Files + fileIndex;
|
|
*offset = 0;
|
|
for (i = p->FolderStartFileIndex[folderIndex]; i < fileIndex; i++)
|
|
*offset += (UInt32)p->db.Files[i].Size;
|
|
*outSizeProcessed = (size_t)fileItem->Size;
|
|
if (*offset + *outSizeProcessed > *outBufferSize)
|
|
return SZ_ERROR_FAIL;
|
|
{
|
|
if (fileItem->FileCRCDefined)
|
|
{
|
|
if (CrcCalc(*outBuffer + *offset, *outSizeProcessed) != fileItem->FileCRC)
|
|
res = SZ_ERROR_CRC;
|
|
}
|
|
}
|
|
}
|
|
return res;
|
|
}
|