visualboyadvance-m/fex/7z_C/7zDec.c

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/* 7zDec.c -- Decoding from 7z folder
2010-11-02 : Igor Pavlov : Public domain */
#include <string.h>
/* #define _7ZIP_PPMD_SUPPPORT */
#include "7z.h"
#include "Bcj2.h"
#include "Bra.h"
#include "CpuArch.h"
#include "Lzma2Dec.h"
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#include "LzmaDec.h"
#ifdef _7ZIP_PPMD_SUPPPORT
#include "Ppmd7.h"
#endif
#define k_Copy 0
#define k_LZMA2 0x21
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#define k_LZMA 0x30101
#define k_BCJ 0x03030103
#define k_PPC 0x03030205
#define k_ARM 0x03030501
#define k_ARMT 0x03030701
#define k_SPARC 0x03030805
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#define k_BCJ2 0x0303011B
#ifdef _7ZIP_PPMD_SUPPPORT
#define k_PPMD 0x30401
typedef struct
{
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IByteIn p;
const Byte* cur;
const Byte* end;
const Byte* begin;
UInt64 processed;
Bool extra;
SRes res;
ILookInStream* inStream;
} CByteInToLook;
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static Byte ReadByte(void* pp)
{
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CByteInToLook* p = (CByteInToLook*)pp;
if (p->cur != p->end)
return *p->cur++;
if (p->res == SZ_OK) {
size_t size = p->cur - p->begin;
p->processed += size;
p->res = p->inStream->Skip(p->inStream, size);
size = (1 << 25);
p->res = p->inStream->Look(p->inStream, (const void**)&p->begin, &size);
p->cur = p->begin;
p->end = p->begin + size;
if (size != 0)
return *p->cur++;
;
}
p->extra = True;
return 0;
}
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static SRes SzDecodePpmd(CSzCoderInfo* coder, UInt64 inSize, ILookInStream* inStream,
Byte* outBuffer, SizeT outSize, ISzAlloc* allocMain)
{
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CPpmd7 ppmd;
CByteInToLook s;
SRes res = SZ_OK;
s.p.Read = ReadByte;
s.inStream = inStream;
s.begin = s.end = s.cur = NULL;
s.extra = False;
s.res = SZ_OK;
s.processed = 0;
if (coder->Props.size != 5)
return SZ_ERROR_UNSUPPORTED;
{
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unsigned order = coder->Props.data[0];
UInt32 memSize = GetUi32(coder->Props.data + 1);
if (order < PPMD7_MIN_ORDER || order > PPMD7_MAX_ORDER || memSize < PPMD7_MIN_MEM_SIZE || memSize > PPMD7_MAX_MEM_SIZE)
return SZ_ERROR_UNSUPPORTED;
Ppmd7_Construct(&ppmd);
if (!Ppmd7_Alloc(&ppmd, memSize, allocMain))
return SZ_ERROR_MEM;
Ppmd7_Init(&ppmd, order);
}
{
CPpmd7z_RangeDec rc;
Ppmd7z_RangeDec_CreateVTable(&rc);
rc.Stream = &s.p;
if (!Ppmd7z_RangeDec_Init(&rc))
res = SZ_ERROR_DATA;
else if (s.extra)
res = (s.res != SZ_OK ? s.res : SZ_ERROR_DATA);
else {
SizeT i;
for (i = 0; i < outSize; i++) {
int sym = Ppmd7_DecodeSymbol(&ppmd, &rc.p);
if (s.extra || sym < 0)
break;
outBuffer[i] = (Byte)sym;
}
if (i != outSize)
res = (s.res != SZ_OK ? s.res : SZ_ERROR_DATA);
else if (s.processed + (s.cur - s.begin) != inSize || !Ppmd7z_RangeDec_IsFinishedOK(&rc))
res = SZ_ERROR_DATA;
}
}
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Ppmd7_Free(&ppmd, allocMain);
return res;
}
#endif
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static SRes SzDecodeLzma(CSzCoderInfo* coder, UInt64 inSize, ILookInStream* inStream,
Byte* outBuffer, SizeT outSize, ISzAlloc* allocMain)
{
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CLzmaDec state;
SRes res = SZ_OK;
LzmaDec_Construct(&state);
RINOK(LzmaDec_AllocateProbs(&state, coder->Props.data, (unsigned)coder->Props.size, allocMain));
state.dic = outBuffer;
state.dicBufSize = outSize;
LzmaDec_Init(&state);
for (;;) {
Byte* inBuf = NULL;
size_t lookahead = (1 << 18);
if (lookahead > inSize)
lookahead = (size_t)inSize;
res = inStream->Look((void*)inStream, (const void**)&inBuf, &lookahead);
if (res != SZ_OK)
break;
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{
SizeT inProcessed = (SizeT)lookahead, dicPos = state.dicPos;
ELzmaStatus status;
res = LzmaDec_DecodeToDic(&state, outSize, inBuf, &inProcessed, LZMA_FINISH_END, &status);
lookahead -= inProcessed;
inSize -= inProcessed;
if (res != SZ_OK)
break;
if (state.dicPos == state.dicBufSize || (inProcessed == 0 && dicPos == state.dicPos)) {
if (state.dicBufSize != outSize || lookahead != 0 || (status != LZMA_STATUS_FINISHED_WITH_MARK && status != LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK))
res = SZ_ERROR_DATA;
break;
}
res = inStream->Skip((void*)inStream, inProcessed);
if (res != SZ_OK)
break;
}
}
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LzmaDec_FreeProbs(&state, allocMain);
return res;
}
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static SRes SzDecodeLzma2(CSzCoderInfo* coder, UInt64 inSize, ILookInStream* inStream,
Byte* outBuffer, SizeT outSize, ISzAlloc* allocMain)
{
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CLzma2Dec state;
SRes res = SZ_OK;
Lzma2Dec_Construct(&state);
if (coder->Props.size != 1)
return SZ_ERROR_DATA;
RINOK(Lzma2Dec_AllocateProbs(&state, coder->Props.data[0], allocMain));
state.decoder.dic = outBuffer;
state.decoder.dicBufSize = outSize;
Lzma2Dec_Init(&state);
for (;;) {
Byte* inBuf = NULL;
size_t lookahead = (1 << 18);
if (lookahead > inSize)
lookahead = (size_t)inSize;
res = inStream->Look((void*)inStream, (const void**)&inBuf, &lookahead);
if (res != SZ_OK)
break;
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{
SizeT inProcessed = (SizeT)lookahead, dicPos = state.decoder.dicPos;
ELzmaStatus status;
res = Lzma2Dec_DecodeToDic(&state, outSize, inBuf, &inProcessed, LZMA_FINISH_END, &status);
lookahead -= inProcessed;
inSize -= inProcessed;
if (res != SZ_OK)
break;
if (state.decoder.dicPos == state.decoder.dicBufSize || (inProcessed == 0 && dicPos == state.decoder.dicPos)) {
if (state.decoder.dicBufSize != outSize || lookahead != 0 || (status != LZMA_STATUS_FINISHED_WITH_MARK))
res = SZ_ERROR_DATA;
break;
}
res = inStream->Skip((void*)inStream, inProcessed);
if (res != SZ_OK)
break;
}
}
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Lzma2Dec_FreeProbs(&state, allocMain);
return res;
}
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static SRes SzDecodeCopy(UInt64 inSize, ILookInStream* inStream, Byte* outBuffer)
{
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while (inSize > 0) {
void* inBuf;
size_t curSize = (1 << 18);
if (curSize > inSize)
curSize = (size_t)inSize;
RINOK(inStream->Look((void*)inStream, (const void**)&inBuf, &curSize));
if (curSize == 0)
return SZ_ERROR_INPUT_EOF;
memcpy(outBuffer, inBuf, curSize);
outBuffer += curSize;
inSize -= curSize;
RINOK(inStream->Skip((void*)inStream, curSize));
}
return SZ_OK;
}
static Bool IS_MAIN_METHOD(UInt32 m)
{
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switch (m) {
case k_Copy:
case k_LZMA:
case k_LZMA2:
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#ifdef _7ZIP_PPMD_SUPPPORT
case k_PPMD:
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#endif
return True;
}
return False;
}
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static Bool IS_SUPPORTED_CODER(const CSzCoderInfo* c)
{
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return c->NumInStreams == 1 && c->NumOutStreams == 1 && c->MethodID <= (UInt32)0xFFFFFFFF && IS_MAIN_METHOD((UInt32)c->MethodID);
}
#define IS_BCJ2(c) ((c)->MethodID == k_BCJ2 && (c)->NumInStreams == 4 && (c)->NumOutStreams == 1)
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static SRes CheckSupportedFolder(const CSzFolder* f)
{
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if (f->NumCoders < 1 || f->NumCoders > 4)
return SZ_ERROR_UNSUPPORTED;
if (!IS_SUPPORTED_CODER(&f->Coders[0]))
return SZ_ERROR_UNSUPPORTED;
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if (f->NumCoders == 1) {
if (f->NumPackStreams != 1 || f->PackStreams[0] != 0 || f->NumBindPairs != 0)
return SZ_ERROR_UNSUPPORTED;
return SZ_OK;
}
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if (f->NumCoders == 2) {
CSzCoderInfo* c = &f->Coders[1];
if (c->MethodID > (UInt32)0xFFFFFFFF || c->NumInStreams != 1 || c->NumOutStreams != 1 || f->NumPackStreams != 1 || f->PackStreams[0] != 0 || f->NumBindPairs != 1 || f->BindPairs[0].InIndex != 1 || f->BindPairs[0].OutIndex != 0)
return SZ_ERROR_UNSUPPORTED;
switch ((UInt32)c->MethodID) {
case k_BCJ:
case k_ARM:
break;
default:
return SZ_ERROR_UNSUPPORTED;
}
return SZ_OK;
}
if (f->NumCoders == 4) {
if (!IS_SUPPORTED_CODER(&f->Coders[1]) || !IS_SUPPORTED_CODER(&f->Coders[2]) || !IS_BCJ2(&f->Coders[3]))
return SZ_ERROR_UNSUPPORTED;
if (f->NumPackStreams != 4 || f->PackStreams[0] != 2 || f->PackStreams[1] != 6 || f->PackStreams[2] != 1 || f->PackStreams[3] != 0 || f->NumBindPairs != 3 || f->BindPairs[0].InIndex != 5 || f->BindPairs[0].OutIndex != 0 || f->BindPairs[1].InIndex != 4 || f->BindPairs[1].OutIndex != 1 || f->BindPairs[2].InIndex != 3 || f->BindPairs[2].OutIndex != 2)
return SZ_ERROR_UNSUPPORTED;
return SZ_OK;
}
return SZ_ERROR_UNSUPPORTED;
}
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static UInt64 GetSum(const UInt64* values, UInt32 index)
{
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UInt64 sum = 0;
UInt32 i;
for (i = 0; i < index; i++)
sum += values[i];
return sum;
}
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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, const UInt64* packSizes,
ILookInStream* inStream, UInt64 startPos,
Byte* outBuffer, SizeT outSize, ISzAlloc* allocMain,
Byte* tempBuf[])
{
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UInt32 ci;
SizeT tempSizes[3] = { 0, 0, 0 };
SizeT tempSize3 = 0;
Byte* tempBuf3 = 0;
RINOK(CheckSupportedFolder(folder));
for (ci = 0; ci < folder->NumCoders; ci++) {
CSzCoderInfo* coder = &folder->Coders[ci];
if (IS_MAIN_METHOD((UInt32)coder->MethodID)) {
UInt32 si = 0;
UInt64 offset;
UInt64 inSize;
Byte* outBufCur = outBuffer;
SizeT outSizeCur = outSize;
if (folder->NumCoders == 4) {
UInt32 indices[] = { 3, 2, 0 };
UInt64 unpackSize = folder->UnpackSizes[ci];
si = indices[ci];
if (ci < 2) {
Byte* temp;
outSizeCur = (SizeT)unpackSize;
if (outSizeCur != unpackSize)
return SZ_ERROR_MEM;
temp = (Byte*)IAlloc_Alloc(allocMain, outSizeCur);
if (temp == 0 && outSizeCur != 0)
return SZ_ERROR_MEM;
outBufCur = tempBuf[1 - ci] = temp;
tempSizes[1 - ci] = outSizeCur;
} else if (ci == 2) {
if (unpackSize > outSize) /* check it */
return SZ_ERROR_PARAM;
tempBuf3 = outBufCur = outBuffer + (outSize - (size_t)unpackSize);
tempSize3 = outSizeCur = (SizeT)unpackSize;
} else
return SZ_ERROR_UNSUPPORTED;
}
offset = GetSum(packSizes, si);
inSize = packSizes[si];
RINOK(LookInStream_SeekTo(inStream, startPos + offset));
if (coder->MethodID == k_Copy) {
if (inSize != outSizeCur) /* check it */
return SZ_ERROR_DATA;
RINOK(SzDecodeCopy(inSize, inStream, outBufCur));
} else if (coder->MethodID == k_LZMA) {
RINOK(SzDecodeLzma(coder, inSize, inStream, outBufCur, outSizeCur, allocMain));
} else if (coder->MethodID == k_LZMA2) {
RINOK(SzDecodeLzma2(coder, inSize, inStream, outBufCur, outSizeCur, allocMain));
} else {
#ifdef _7ZIP_PPMD_SUPPPORT
RINOK(SzDecodePpmd(coder, inSize, inStream, outBufCur, outSizeCur, allocMain));
#else
return SZ_ERROR_UNSUPPORTED;
#endif
}
} else if (coder->MethodID == k_BCJ2) {
UInt64 offset = GetSum(packSizes, 1);
UInt64 s3Size = packSizes[1];
SRes res;
if (ci != 3)
return SZ_ERROR_UNSUPPORTED;
RINOK(LookInStream_SeekTo(inStream, startPos + offset));
tempSizes[2] = (SizeT)s3Size;
if (tempSizes[2] != s3Size)
return SZ_ERROR_MEM;
tempBuf[2] = (Byte*)IAlloc_Alloc(allocMain, tempSizes[2]);
if (tempBuf[2] == 0 && tempSizes[2] != 0)
return SZ_ERROR_MEM;
res = SzDecodeCopy(s3Size, inStream, tempBuf[2]);
RINOK(res)
res = Bcj2_Decode(
tempBuf3, tempSize3,
tempBuf[0], tempSizes[0],
tempBuf[1], tempSizes[1],
tempBuf[2], tempSizes[2],
outBuffer, outSize);
RINOK(res)
} else {
if (ci != 1)
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(ARM)
default:
return SZ_ERROR_UNSUPPORTED;
}
}
}
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return SZ_OK;
}
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SRes SzFolder_Decode(const CSzFolder* folder, const UInt64* packSizes,
ILookInStream* inStream, UInt64 startPos,
Byte* outBuffer, size_t outSize, ISzAlloc* allocMain)
{
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Byte* tempBuf[3] = { 0, 0, 0 };
int i;
SRes res = SzFolder_Decode2(folder, packSizes, inStream, startPos,
outBuffer, (SizeT)outSize, allocMain, tempBuf);
for (i = 0; i < 3; i++)
IAlloc_Free(allocMain, tempBuf[i]);
return res;
}