mirror of
https://github.com/ZDoom/gzdoom.git
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254 lines
7.6 KiB
C
254 lines
7.6 KiB
C
/* 7zDecode.c -- Decoding from 7z folder
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2008-11-23 : Igor Pavlov : Public domain */
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#include <string.h>
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#include "../../Bcj2.h"
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#include "../../Bra.h"
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#include "../../LzmaDec.h"
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#include "7zDecode.h"
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#define k_Copy 0
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#define k_LZMA 0x30101
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#define k_BCJ 0x03030103
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#define k_BCJ2 0x0303011B
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static SRes SzDecodeLzma(CSzCoderInfo *coder, UInt64 inSize, ILookInStream *inStream,
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Byte *outBuffer, SizeT outSize, ISzAlloc *allocMain)
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{
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CLzmaDec state;
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SRes res = SZ_OK;
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LzmaDec_Construct(&state);
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RINOK(LzmaDec_AllocateProbs(&state, coder->Props.data, (unsigned)coder->Props.size, allocMain));
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state.dic = outBuffer;
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state.dicBufSize = outSize;
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LzmaDec_Init(&state);
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for (;;)
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{
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Byte *inBuf = NULL;
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size_t lookahead = (1 << 18);
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if (lookahead > inSize)
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lookahead = (size_t)inSize;
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res = inStream->Look((void *)inStream, (void **)&inBuf, &lookahead);
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if (res != SZ_OK)
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break;
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{
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SizeT inProcessed = (SizeT)lookahead, dicPos = state.dicPos;
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ELzmaStatus status;
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res = LzmaDec_DecodeToDic(&state, outSize, inBuf, &inProcessed, LZMA_FINISH_END, &status);
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lookahead -= inProcessed;
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inSize -= inProcessed;
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if (res != SZ_OK)
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break;
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if (state.dicPos == state.dicBufSize || (inProcessed == 0 && dicPos == state.dicPos))
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{
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if (state.dicBufSize != outSize || lookahead != 0 ||
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(status != LZMA_STATUS_FINISHED_WITH_MARK &&
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status != LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK))
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res = SZ_ERROR_DATA;
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break;
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}
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res = inStream->Skip((void *)inStream, inProcessed);
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if (res != SZ_OK)
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break;
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}
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}
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LzmaDec_FreeProbs(&state, allocMain);
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return res;
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}
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static SRes SzDecodeCopy(UInt64 inSize, ILookInStream *inStream, Byte *outBuffer)
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{
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while (inSize > 0)
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{
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void *inBuf;
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size_t curSize = (1 << 18);
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if (curSize > inSize)
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curSize = (size_t)inSize;
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RINOK(inStream->Look((void *)inStream, (void **)&inBuf, &curSize));
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if (curSize == 0)
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return SZ_ERROR_INPUT_EOF;
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memcpy(outBuffer, inBuf, curSize);
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outBuffer += curSize;
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inSize -= curSize;
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RINOK(inStream->Skip((void *)inStream, curSize));
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}
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return SZ_OK;
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}
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#define IS_UNSUPPORTED_METHOD(m) ((m) != k_Copy && (m) != k_LZMA)
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#define IS_UNSUPPORTED_CODER(c) (IS_UNSUPPORTED_METHOD(c.MethodID) || c.NumInStreams != 1 || c.NumOutStreams != 1)
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#define IS_NO_BCJ(c) (c.MethodID != k_BCJ || c.NumInStreams != 1 || c.NumOutStreams != 1)
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#define IS_NO_BCJ2(c) (c.MethodID != k_BCJ2 || c.NumInStreams != 4 || c.NumOutStreams != 1)
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SRes CheckSupportedFolder(const CSzFolder *f)
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{
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if (f->NumCoders < 1 || f->NumCoders > 4)
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return SZ_ERROR_UNSUPPORTED;
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if (IS_UNSUPPORTED_CODER(f->Coders[0]))
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return SZ_ERROR_UNSUPPORTED;
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if (f->NumCoders == 1)
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{
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if (f->NumPackStreams != 1 || f->PackStreams[0] != 0 || f->NumBindPairs != 0)
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return SZ_ERROR_UNSUPPORTED;
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return SZ_OK;
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}
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if (f->NumCoders == 2)
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{
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if (IS_NO_BCJ(f->Coders[1]) ||
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f->NumPackStreams != 1 || f->PackStreams[0] != 0 ||
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f->NumBindPairs != 1 ||
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f->BindPairs[0].InIndex != 1 || f->BindPairs[0].OutIndex != 0)
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return SZ_ERROR_UNSUPPORTED;
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return SZ_OK;
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}
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if (f->NumCoders == 4)
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{
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if (IS_UNSUPPORTED_CODER(f->Coders[1]) ||
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IS_UNSUPPORTED_CODER(f->Coders[2]) ||
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IS_NO_BCJ2(f->Coders[3]))
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return SZ_ERROR_UNSUPPORTED;
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if (f->NumPackStreams != 4 ||
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f->PackStreams[0] != 2 ||
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f->PackStreams[1] != 6 ||
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f->PackStreams[2] != 1 ||
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f->PackStreams[3] != 0 ||
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f->NumBindPairs != 3 ||
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f->BindPairs[0].InIndex != 5 || f->BindPairs[0].OutIndex != 0 ||
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f->BindPairs[1].InIndex != 4 || f->BindPairs[1].OutIndex != 1 ||
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f->BindPairs[2].InIndex != 3 || f->BindPairs[2].OutIndex != 2)
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return SZ_ERROR_UNSUPPORTED;
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return SZ_OK;
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}
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return SZ_ERROR_UNSUPPORTED;
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}
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UInt64 GetSum(const UInt64 *values, UInt32 index)
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{
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UInt64 sum = 0;
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UInt32 i;
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for (i = 0; i < index; i++)
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sum += values[i];
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return sum;
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}
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SRes SzDecode2(const UInt64 *packSizes, const CSzFolder *folder,
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ILookInStream *inStream, UInt64 startPos,
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Byte *outBuffer, SizeT outSize, ISzAlloc *allocMain,
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Byte *tempBuf[])
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{
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UInt32 ci;
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SizeT tempSizes[3] = { 0, 0, 0};
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SizeT tempSize3 = 0;
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Byte *tempBuf3 = 0;
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RINOK(CheckSupportedFolder(folder));
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for (ci = 0; ci < folder->NumCoders; ci++)
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{
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CSzCoderInfo *coder = &folder->Coders[ci];
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if (coder->MethodID == k_Copy || coder->MethodID == k_LZMA)
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{
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UInt32 si = 0;
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UInt64 offset;
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UInt64 inSize;
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Byte *outBufCur = outBuffer;
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SizeT outSizeCur = outSize;
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if (folder->NumCoders == 4)
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{
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UInt32 indices[] = { 3, 2, 0 };
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UInt64 unpackSize = folder->UnpackSizes[ci];
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si = indices[ci];
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if (ci < 2)
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{
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Byte *temp;
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outSizeCur = (SizeT)unpackSize;
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if (outSizeCur != unpackSize)
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return SZ_ERROR_MEM;
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temp = (Byte *)IAlloc_Alloc(allocMain, outSizeCur);
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if (temp == 0 && outSizeCur != 0)
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return SZ_ERROR_MEM;
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outBufCur = tempBuf[1 - ci] = temp;
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tempSizes[1 - ci] = outSizeCur;
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}
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else if (ci == 2)
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{
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if (unpackSize > outSize) /* check it */
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return SZ_ERROR_PARAM;
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tempBuf3 = outBufCur = outBuffer + (outSize - (size_t)unpackSize);
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tempSize3 = outSizeCur = (SizeT)unpackSize;
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}
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else
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return SZ_ERROR_UNSUPPORTED;
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}
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offset = GetSum(packSizes, si);
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inSize = packSizes[si];
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RINOK(LookInStream_SeekTo(inStream, startPos + offset));
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if (coder->MethodID == k_Copy)
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{
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if (inSize != outSizeCur) /* check it */
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return SZ_ERROR_DATA;
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RINOK(SzDecodeCopy(inSize, inStream, outBufCur));
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}
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else
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{
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RINOK(SzDecodeLzma(coder, inSize, inStream, outBufCur, outSizeCur, allocMain));
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}
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}
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else if (coder->MethodID == k_BCJ)
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{
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UInt32 state;
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if (ci != 1)
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return SZ_ERROR_UNSUPPORTED;
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x86_Convert_Init(state);
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x86_Convert(outBuffer, outSize, 0, &state, 0);
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}
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else if (coder->MethodID == k_BCJ2)
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{
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UInt64 offset = GetSum(packSizes, 1);
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UInt64 s3Size = packSizes[1];
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SRes res;
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if (ci != 3)
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return SZ_ERROR_UNSUPPORTED;
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RINOK(LookInStream_SeekTo(inStream, startPos + offset));
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tempSizes[2] = (SizeT)s3Size;
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if (tempSizes[2] != s3Size)
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return SZ_ERROR_MEM;
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tempBuf[2] = (Byte *)IAlloc_Alloc(allocMain, tempSizes[2]);
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if (tempBuf[2] == 0 && tempSizes[2] != 0)
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return SZ_ERROR_MEM;
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res = SzDecodeCopy(s3Size, inStream, tempBuf[2]);
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RINOK(res)
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res = Bcj2_Decode(
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tempBuf3, tempSize3,
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tempBuf[0], tempSizes[0],
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tempBuf[1], tempSizes[1],
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tempBuf[2], tempSizes[2],
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outBuffer, outSize);
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RINOK(res)
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}
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else
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return SZ_ERROR_UNSUPPORTED;
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}
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return SZ_OK;
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}
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SRes SzDecode(const UInt64 *packSizes, const CSzFolder *folder,
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ILookInStream *inStream, UInt64 startPos,
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Byte *outBuffer, size_t outSize, ISzAlloc *allocMain)
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{
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Byte *tempBuf[3] = { 0, 0, 0};
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int i;
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SRes res = SzDecode2(packSizes, folder, inStream, startPos,
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outBuffer, (SizeT)outSize, allocMain, tempBuf);
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for (i = 0; i < 3; i++)
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IAlloc_Free(allocMain, tempBuf[i]);
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return res;
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}
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