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592 lines
15 KiB
C
592 lines
15 KiB
C
/* 7zDec.c -- Decoding from 7z folder
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2017-04-03 : Igor Pavlov : Public domain */
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#include "Precomp.h"
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#include <string.h>
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/* #define _7ZIP_PPMD_SUPPPORT */
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#include "7z.h"
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#include "7zCrc.h"
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#include "Bcj2.h"
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#include "Bra.h"
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#include "CpuArch.h"
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#include "Delta.h"
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#include "LzmaDec.h"
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#include "Lzma2Dec.h"
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#ifdef _7ZIP_PPMD_SUPPPORT
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#include "Ppmd7.h"
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#endif
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#define k_Copy 0
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#define k_Delta 3
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#define k_LZMA2 0x21
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#define k_LZMA 0x30101
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#define k_BCJ 0x3030103
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#define k_BCJ2 0x303011B
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#define k_PPC 0x3030205
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#define k_IA64 0x3030401
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#define k_ARM 0x3030501
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#define k_ARMT 0x3030701
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#define k_SPARC 0x3030805
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#ifdef _7ZIP_PPMD_SUPPPORT
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#define k_PPMD 0x30401
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typedef struct
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{
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IByteIn vt;
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const Byte *cur;
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const Byte *end;
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const Byte *begin;
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UInt64 processed;
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Bool extra;
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SRes res;
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const ILookInStream *inStream;
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} CByteInToLook;
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static Byte ReadByte(const IByteIn *pp)
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{
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CByteInToLook *p = CONTAINER_FROM_VTBL(pp, CByteInToLook, vt);
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if (p->cur != p->end)
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return *p->cur++;
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if (p->res == SZ_OK)
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{
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size_t size = p->cur - p->begin;
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p->processed += size;
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p->res = ILookInStream_Skip(p->inStream, size);
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size = (1 << 25);
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p->res = ILookInStream_Look(p->inStream, (const void **)&p->begin, &size);
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p->cur = p->begin;
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p->end = p->begin + size;
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if (size != 0)
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return *p->cur++;;
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}
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p->extra = True;
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return 0;
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}
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static SRes SzDecodePpmd(const Byte *props, unsigned propsSize, UInt64 inSize, const ILookInStream *inStream,
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Byte *outBuffer, SizeT outSize, ISzAllocPtr allocMain)
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{
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CPpmd7 ppmd;
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CByteInToLook s;
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SRes res = SZ_OK;
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s.vt.Read = ReadByte;
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s.inStream = inStream;
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s.begin = s.end = s.cur = NULL;
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s.extra = False;
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s.res = SZ_OK;
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s.processed = 0;
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if (propsSize != 5)
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return SZ_ERROR_UNSUPPORTED;
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{
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unsigned order = props[0];
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UInt32 memSize = GetUi32(props + 1);
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if (order < PPMD7_MIN_ORDER ||
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order > PPMD7_MAX_ORDER ||
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memSize < PPMD7_MIN_MEM_SIZE ||
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memSize > PPMD7_MAX_MEM_SIZE)
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return SZ_ERROR_UNSUPPORTED;
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Ppmd7_Construct(&ppmd);
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if (!Ppmd7_Alloc(&ppmd, memSize, allocMain))
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return SZ_ERROR_MEM;
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Ppmd7_Init(&ppmd, order);
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}
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{
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CPpmd7z_RangeDec rc;
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Ppmd7z_RangeDec_CreateVTable(&rc);
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rc.Stream = &s.vt;
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if (!Ppmd7z_RangeDec_Init(&rc))
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res = SZ_ERROR_DATA;
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else if (s.extra)
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res = (s.res != SZ_OK ? s.res : SZ_ERROR_DATA);
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else
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{
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SizeT i;
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for (i = 0; i < outSize; i++)
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{
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int sym = Ppmd7_DecodeSymbol(&ppmd, &rc.vt);
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if (s.extra || sym < 0)
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break;
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outBuffer[i] = (Byte)sym;
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}
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if (i != outSize)
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res = (s.res != SZ_OK ? s.res : SZ_ERROR_DATA);
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else if (s.processed + (s.cur - s.begin) != inSize || !Ppmd7z_RangeDec_IsFinishedOK(&rc))
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res = SZ_ERROR_DATA;
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}
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}
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Ppmd7_Free(&ppmd, allocMain);
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return res;
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}
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#endif
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static SRes SzDecodeLzma(const Byte *props, unsigned propsSize, UInt64 inSize, ILookInStream *inStream,
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Byte *outBuffer, SizeT outSize, ISzAllocPtr 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, props, propsSize, 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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const void *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 = ILookInStream_Look(inStream, &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 (status == LZMA_STATUS_FINISHED_WITH_MARK)
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{
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if (outSize != state.dicPos || inSize != 0)
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res = SZ_ERROR_DATA;
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break;
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}
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if (outSize == state.dicPos && inSize == 0 && status == LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK)
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break;
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if (inProcessed == 0 && dicPos == state.dicPos)
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{
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res = SZ_ERROR_DATA;
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break;
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}
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res = ILookInStream_Skip(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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#ifndef _7Z_NO_METHOD_LZMA2
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static SRes SzDecodeLzma2(const Byte *props, unsigned propsSize, UInt64 inSize, ILookInStream *inStream,
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Byte *outBuffer, SizeT outSize, ISzAllocPtr allocMain)
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{
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CLzma2Dec state;
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SRes res = SZ_OK;
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Lzma2Dec_Construct(&state);
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if (propsSize != 1)
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return SZ_ERROR_DATA;
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RINOK(Lzma2Dec_AllocateProbs(&state, props[0], allocMain));
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state.decoder.dic = outBuffer;
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state.decoder.dicBufSize = outSize;
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Lzma2Dec_Init(&state);
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for (;;)
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{
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const void *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 = ILookInStream_Look(inStream, &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.decoder.dicPos;
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ELzmaStatus status;
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res = Lzma2Dec_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 (status == LZMA_STATUS_FINISHED_WITH_MARK)
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{
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if (outSize != state.decoder.dicPos || inSize != 0)
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res = SZ_ERROR_DATA;
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break;
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}
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if (inProcessed == 0 && dicPos == state.decoder.dicPos)
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{
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res = SZ_ERROR_DATA;
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break;
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}
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res = ILookInStream_Skip(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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Lzma2Dec_FreeProbs(&state, allocMain);
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return res;
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}
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#endif
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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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const 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(ILookInStream_Look(inStream, &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(ILookInStream_Skip(inStream, curSize));
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}
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return SZ_OK;
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}
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static Bool IS_MAIN_METHOD(UInt32 m)
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{
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switch (m)
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{
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case k_Copy:
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case k_LZMA:
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#ifndef _7Z_NO_METHOD_LZMA2
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case k_LZMA2:
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#endif
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#ifdef _7ZIP_PPMD_SUPPPORT
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case k_PPMD:
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#endif
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return True;
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}
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return False;
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}
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static Bool IS_SUPPORTED_CODER(const CSzCoderInfo *c)
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{
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return
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c->NumStreams == 1
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/* && c->MethodID <= (UInt32)0xFFFFFFFF */
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&& IS_MAIN_METHOD((UInt32)c->MethodID);
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}
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#define IS_BCJ2(c) ((c)->MethodID == k_BCJ2 && (c)->NumStreams == 4)
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static 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_SUPPORTED_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->NumBonds != 0)
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return SZ_ERROR_UNSUPPORTED;
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return SZ_OK;
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}
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#ifndef _7Z_NO_METHODS_FILTERS
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if (f->NumCoders == 2)
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{
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const CSzCoderInfo *c = &f->Coders[1];
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if (
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/* c->MethodID > (UInt32)0xFFFFFFFF || */
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c->NumStreams != 1
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|| f->NumPackStreams != 1
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|| f->PackStreams[0] != 0
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|| f->NumBonds != 1
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|| f->Bonds[0].InIndex != 1
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|| f->Bonds[0].OutIndex != 0)
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return SZ_ERROR_UNSUPPORTED;
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switch ((UInt32)c->MethodID)
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{
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case k_Delta:
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case k_BCJ:
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case k_PPC:
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case k_IA64:
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case k_SPARC:
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case k_ARM:
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case k_ARMT:
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break;
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default:
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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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#endif
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if (f->NumCoders == 4)
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{
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if (!IS_SUPPORTED_CODER(&f->Coders[1])
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|| !IS_SUPPORTED_CODER(&f->Coders[2])
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|| !IS_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->NumBonds != 3
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|| f->Bonds[0].InIndex != 5 || f->Bonds[0].OutIndex != 0
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|| f->Bonds[1].InIndex != 4 || f->Bonds[1].OutIndex != 1
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|| f->Bonds[2].InIndex != 3 || f->Bonds[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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#define CASE_BRA_CONV(isa) case k_ ## isa: isa ## _Convert(outBuffer, outSize, 0, 0); break;
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static SRes SzFolder_Decode2(const CSzFolder *folder,
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const Byte *propsData,
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const UInt64 *unpackSizes,
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const UInt64 *packPositions,
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ILookInStream *inStream, UInt64 startPos,
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Byte *outBuffer, SizeT outSize, ISzAllocPtr 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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const CSzCoderInfo *coder = &folder->Coders[ci];
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if (IS_MAIN_METHOD((UInt32)coder->MethodID))
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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 = 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 *)ISzAlloc_Alloc(allocMain, outSizeCur);
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if (!temp && 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 = packPositions[si];
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inSize = packPositions[(size_t)si + 1] - offset;
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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 if (coder->MethodID == k_LZMA)
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{
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RINOK(SzDecodeLzma(propsData + coder->PropsOffset, coder->PropsSize, inSize, inStream, outBufCur, outSizeCur, allocMain));
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}
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#ifndef _7Z_NO_METHOD_LZMA2
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else if (coder->MethodID == k_LZMA2)
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{
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RINOK(SzDecodeLzma2(propsData + coder->PropsOffset, coder->PropsSize, inSize, inStream, outBufCur, outSizeCur, allocMain));
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}
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#endif
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#ifdef _7ZIP_PPMD_SUPPPORT
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else if (coder->MethodID == k_PPMD)
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{
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RINOK(SzDecodePpmd(propsData + coder->PropsOffset, coder->PropsSize, inSize, inStream, outBufCur, outSizeCur, allocMain));
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}
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#endif
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else
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return SZ_ERROR_UNSUPPORTED;
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}
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else if (coder->MethodID == k_BCJ2)
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{
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UInt64 offset = packPositions[1];
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UInt64 s3Size = packPositions[2] - offset;
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if (ci != 3)
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return SZ_ERROR_UNSUPPORTED;
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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 *)ISzAlloc_Alloc(allocMain, tempSizes[2]);
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if (!tempBuf[2] && tempSizes[2] != 0)
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return SZ_ERROR_MEM;
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RINOK(LookInStream_SeekTo(inStream, startPos + offset));
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RINOK(SzDecodeCopy(s3Size, inStream, tempBuf[2]));
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if ((tempSizes[0] & 3) != 0 ||
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(tempSizes[1] & 3) != 0 ||
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tempSize3 + tempSizes[0] + tempSizes[1] != outSize)
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return SZ_ERROR_DATA;
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{
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CBcj2Dec p;
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p.bufs[0] = tempBuf3; p.lims[0] = tempBuf3 + tempSize3;
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p.bufs[1] = tempBuf[0]; p.lims[1] = tempBuf[0] + tempSizes[0];
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p.bufs[2] = tempBuf[1]; p.lims[2] = tempBuf[1] + tempSizes[1];
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p.bufs[3] = tempBuf[2]; p.lims[3] = tempBuf[2] + tempSizes[2];
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p.dest = outBuffer;
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p.destLim = outBuffer + outSize;
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Bcj2Dec_Init(&p);
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RINOK(Bcj2Dec_Decode(&p));
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{
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unsigned i;
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for (i = 0; i < 4; i++)
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if (p.bufs[i] != p.lims[i])
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return SZ_ERROR_DATA;
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if (!Bcj2Dec_IsFinished(&p))
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return SZ_ERROR_DATA;
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if (p.dest != p.destLim
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|| p.state != BCJ2_STREAM_MAIN)
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return SZ_ERROR_DATA;
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}
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}
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}
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#ifndef _7Z_NO_METHODS_FILTERS
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else if (ci == 1)
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{
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if (coder->MethodID == k_Delta)
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{
|
|
if (coder->PropsSize != 1)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
{
|
|
Byte state[DELTA_STATE_SIZE];
|
|
Delta_Init(state);
|
|
Delta_Decode(state, (unsigned)(propsData[coder->PropsOffset]) + 1, outBuffer, outSize);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (coder->PropsSize != 0)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
switch (coder->MethodID)
|
|
{
|
|
case k_BCJ:
|
|
{
|
|
UInt32 state;
|
|
x86_Convert_Init(state);
|
|
x86_Convert(outBuffer, outSize, 0, &state, 0);
|
|
break;
|
|
}
|
|
CASE_BRA_CONV(PPC)
|
|
CASE_BRA_CONV(IA64)
|
|
CASE_BRA_CONV(SPARC)
|
|
CASE_BRA_CONV(ARM)
|
|
CASE_BRA_CONV(ARMT)
|
|
default:
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
else
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
}
|
|
|
|
return SZ_OK;
|
|
}
|
|
|
|
|
|
SRes SzAr_DecodeFolder(const CSzAr *p, UInt32 folderIndex,
|
|
ILookInStream *inStream, UInt64 startPos,
|
|
Byte *outBuffer, size_t outSize,
|
|
ISzAllocPtr allocMain)
|
|
{
|
|
SRes res;
|
|
CSzFolder folder;
|
|
CSzData sd;
|
|
|
|
const Byte *data = p->CodersData + p->FoCodersOffsets[folderIndex];
|
|
sd.Data = data;
|
|
sd.Size = p->FoCodersOffsets[(size_t)folderIndex + 1] - p->FoCodersOffsets[folderIndex];
|
|
|
|
res = SzGetNextFolderItem(&folder, &sd);
|
|
|
|
if (res != SZ_OK)
|
|
return res;
|
|
|
|
if (sd.Size != 0
|
|
|| folder.UnpackStream != p->FoToMainUnpackSizeIndex[folderIndex]
|
|
|| outSize != SzAr_GetFolderUnpackSize(p, folderIndex))
|
|
return SZ_ERROR_FAIL;
|
|
{
|
|
unsigned i;
|
|
Byte *tempBuf[3] = { 0, 0, 0};
|
|
|
|
res = SzFolder_Decode2(&folder, data,
|
|
&p->CoderUnpackSizes[p->FoToCoderUnpackSizes[folderIndex]],
|
|
p->PackPositions + p->FoStartPackStreamIndex[folderIndex],
|
|
inStream, startPos,
|
|
outBuffer, (SizeT)outSize, allocMain, tempBuf);
|
|
|
|
for (i = 0; i < 3; i++)
|
|
ISzAlloc_Free(allocMain, tempBuf[i]);
|
|
|
|
if (res == SZ_OK)
|
|
if (SzBitWithVals_Check(&p->FolderCRCs, folderIndex))
|
|
if (CrcCalc(outBuffer, outSize) != p->FolderCRCs.Vals[folderIndex])
|
|
res = SZ_ERROR_CRC;
|
|
|
|
return res;
|
|
}
|
|
}
|