You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
909 lines
22 KiB
909 lines
22 KiB
/* XzDec.c -- Xz Decode
|
|
2014-12-30 : Igor Pavlov : Public domain */
|
|
|
|
#include "Precomp.h"
|
|
|
|
/* #define XZ_DUMP */
|
|
|
|
#ifdef XZ_DUMP
|
|
#include <stdio.h>
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "7zCrc.h"
|
|
#include "Alloc.h"
|
|
#include "Bra.h"
|
|
#include "CpuArch.h"
|
|
#include "Delta.h"
|
|
#include "Lzma2Dec.h"
|
|
|
|
#ifdef USE_SUBBLOCK
|
|
#include "Bcj3Dec.c"
|
|
#include "SbDec.c"
|
|
#endif
|
|
|
|
#include "Xz.h"
|
|
|
|
#define XZ_CHECK_SIZE_MAX 64
|
|
|
|
#define CODER_BUF_SIZE (1 << 17)
|
|
|
|
unsigned Xz_ReadVarInt(const Byte *p, size_t maxSize, UInt64 *value)
|
|
{
|
|
int i, limit;
|
|
*value = 0;
|
|
limit = (maxSize > 9) ? 9 : (int)maxSize;
|
|
|
|
for (i = 0; i < limit;)
|
|
{
|
|
Byte b = p[i];
|
|
*value |= (UInt64)(b & 0x7F) << (7 * i++);
|
|
if ((b & 0x80) == 0)
|
|
return (b == 0 && i != 1) ? 0 : i;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* ---------- BraState ---------- */
|
|
|
|
#define BRA_BUF_SIZE (1 << 14)
|
|
|
|
typedef struct
|
|
{
|
|
size_t bufPos;
|
|
size_t bufConv;
|
|
size_t bufTotal;
|
|
|
|
UInt32 methodId;
|
|
int encodeMode;
|
|
UInt32 delta;
|
|
UInt32 ip;
|
|
UInt32 x86State;
|
|
Byte deltaState[DELTA_STATE_SIZE];
|
|
|
|
Byte buf[BRA_BUF_SIZE];
|
|
} CBraState;
|
|
|
|
void BraState_Free(void *pp, ISzAlloc *alloc)
|
|
{
|
|
alloc->Free(alloc, pp);
|
|
}
|
|
|
|
SRes BraState_SetProps(void *pp, const Byte *props, size_t propSize, ISzAlloc *alloc)
|
|
{
|
|
CBraState *p = ((CBraState *)pp);
|
|
alloc = alloc;
|
|
p->ip = 0;
|
|
if (p->methodId == XZ_ID_Delta)
|
|
{
|
|
if (propSize != 1)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
p->delta = (unsigned)props[0] + 1;
|
|
}
|
|
else
|
|
{
|
|
if (propSize == 4)
|
|
{
|
|
UInt32 v = GetUi32(props);
|
|
switch(p->methodId)
|
|
{
|
|
case XZ_ID_PPC:
|
|
case XZ_ID_ARM:
|
|
case XZ_ID_SPARC:
|
|
if ((v & 3) != 0)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
break;
|
|
case XZ_ID_ARMT:
|
|
if ((v & 1) != 0)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
break;
|
|
case XZ_ID_IA64:
|
|
if ((v & 0xF) != 0)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
break;
|
|
}
|
|
p->ip = v;
|
|
}
|
|
else if (propSize != 0)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
}
|
|
return SZ_OK;
|
|
}
|
|
|
|
void BraState_Init(void *pp)
|
|
{
|
|
CBraState *p = ((CBraState *)pp);
|
|
p->bufPos = p->bufConv = p->bufTotal = 0;
|
|
x86_Convert_Init(p->x86State);
|
|
if (p->methodId == XZ_ID_Delta)
|
|
Delta_Init(p->deltaState);
|
|
}
|
|
|
|
#define CASE_BRA_CONV(isa) case XZ_ID_ ## isa: p->bufConv = isa ## _Convert(p->buf, p->bufTotal, p->ip, p->encodeMode); break;
|
|
|
|
static SRes BraState_Code(void *pp, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
|
|
int srcWasFinished, ECoderFinishMode finishMode, int *wasFinished)
|
|
{
|
|
CBraState *p = ((CBraState *)pp);
|
|
SizeT destLenOrig = *destLen;
|
|
SizeT srcLenOrig = *srcLen;
|
|
*destLen = 0;
|
|
*srcLen = 0;
|
|
finishMode = finishMode;
|
|
*wasFinished = 0;
|
|
while (destLenOrig > 0)
|
|
{
|
|
if (p->bufPos != p->bufConv)
|
|
{
|
|
size_t curSize = p->bufConv - p->bufPos;
|
|
if (curSize > destLenOrig)
|
|
curSize = destLenOrig;
|
|
memcpy(dest, p->buf + p->bufPos, curSize);
|
|
p->bufPos += curSize;
|
|
*destLen += curSize;
|
|
dest += curSize;
|
|
destLenOrig -= curSize;
|
|
continue;
|
|
}
|
|
p->bufTotal -= p->bufPos;
|
|
memmove(p->buf, p->buf + p->bufPos, p->bufTotal);
|
|
p->bufPos = 0;
|
|
p->bufConv = 0;
|
|
{
|
|
size_t curSize = BRA_BUF_SIZE - p->bufTotal;
|
|
if (curSize > srcLenOrig)
|
|
curSize = srcLenOrig;
|
|
memcpy(p->buf + p->bufTotal, src, curSize);
|
|
*srcLen += curSize;
|
|
src += curSize;
|
|
srcLenOrig -= curSize;
|
|
p->bufTotal += curSize;
|
|
}
|
|
if (p->bufTotal == 0)
|
|
break;
|
|
switch(p->methodId)
|
|
{
|
|
case XZ_ID_Delta:
|
|
if (p->encodeMode)
|
|
Delta_Encode(p->deltaState, p->delta, p->buf, p->bufTotal);
|
|
else
|
|
Delta_Decode(p->deltaState, p->delta, p->buf, p->bufTotal);
|
|
p->bufConv = p->bufTotal;
|
|
break;
|
|
case XZ_ID_X86:
|
|
p->bufConv = x86_Convert(p->buf, p->bufTotal, p->ip, &p->x86State, p->encodeMode);
|
|
break;
|
|
CASE_BRA_CONV(PPC)
|
|
CASE_BRA_CONV(IA64)
|
|
CASE_BRA_CONV(ARM)
|
|
CASE_BRA_CONV(ARMT)
|
|
CASE_BRA_CONV(SPARC)
|
|
default:
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
}
|
|
p->ip += (UInt32)p->bufConv;
|
|
|
|
if (p->bufConv == 0)
|
|
{
|
|
if (!srcWasFinished)
|
|
break;
|
|
p->bufConv = p->bufTotal;
|
|
}
|
|
}
|
|
if (p->bufTotal == p->bufPos && srcLenOrig == 0 && srcWasFinished)
|
|
*wasFinished = 1;
|
|
return SZ_OK;
|
|
}
|
|
|
|
SRes BraState_SetFromMethod(IStateCoder *p, UInt64 id, int encodeMode, ISzAlloc *alloc)
|
|
{
|
|
CBraState *decoder;
|
|
if (id != XZ_ID_Delta &&
|
|
id != XZ_ID_X86 &&
|
|
id != XZ_ID_PPC &&
|
|
id != XZ_ID_IA64 &&
|
|
id != XZ_ID_ARM &&
|
|
id != XZ_ID_ARMT &&
|
|
id != XZ_ID_SPARC)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
p->p = 0;
|
|
decoder = (CBraState *)alloc->Alloc(alloc, sizeof(CBraState));
|
|
if (decoder == 0)
|
|
return SZ_ERROR_MEM;
|
|
decoder->methodId = (UInt32)id;
|
|
decoder->encodeMode = encodeMode;
|
|
p->p = decoder;
|
|
p->Free = BraState_Free;
|
|
p->SetProps = BraState_SetProps;
|
|
p->Init = BraState_Init;
|
|
p->Code = BraState_Code;
|
|
return SZ_OK;
|
|
}
|
|
|
|
/* ---------- SbState ---------- */
|
|
|
|
#ifdef USE_SUBBLOCK
|
|
|
|
static void SbState_Free(void *pp, ISzAlloc *alloc)
|
|
{
|
|
CSbDec *p = (CSbDec *)pp;
|
|
SbDec_Free(p);
|
|
alloc->Free(alloc, pp);
|
|
}
|
|
|
|
static SRes SbState_SetProps(void *pp, const Byte *props, size_t propSize, ISzAlloc *alloc)
|
|
{
|
|
pp = pp;
|
|
props = props;
|
|
alloc = alloc;
|
|
return (propSize == 0) ? SZ_OK : SZ_ERROR_UNSUPPORTED;
|
|
}
|
|
|
|
static void SbState_Init(void *pp)
|
|
{
|
|
SbDec_Init((CSbDec *)pp);
|
|
}
|
|
|
|
static SRes SbState_Code(void *pp, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
|
|
int srcWasFinished, ECoderFinishMode finishMode, int *wasFinished)
|
|
{
|
|
CSbDec *p = (CSbDec *)pp;
|
|
SRes res;
|
|
srcWasFinished = srcWasFinished;
|
|
p->dest = dest;
|
|
p->destLen = *destLen;
|
|
p->src = src;
|
|
p->srcLen = *srcLen;
|
|
p->finish = finishMode; /* change it */
|
|
res = SbDec_Decode((CSbDec *)pp);
|
|
*destLen -= p->destLen;
|
|
*srcLen -= p->srcLen;
|
|
*wasFinished = (*destLen == 0 && *srcLen == 0); /* change it */
|
|
return res;
|
|
}
|
|
|
|
SRes SbState_SetFromMethod(IStateCoder *p, ISzAlloc *alloc)
|
|
{
|
|
CSbDec *decoder;
|
|
p->p = 0;
|
|
decoder = alloc->Alloc(alloc, sizeof(CSbDec));
|
|
if (decoder == 0)
|
|
return SZ_ERROR_MEM;
|
|
p->p = decoder;
|
|
p->Free = SbState_Free;
|
|
p->SetProps = SbState_SetProps;
|
|
p->Init = SbState_Init;
|
|
p->Code = SbState_Code;
|
|
SbDec_Construct(decoder);
|
|
SbDec_SetAlloc(decoder, alloc);
|
|
return SZ_OK;
|
|
}
|
|
#endif
|
|
|
|
/* ---------- Lzma2State ---------- */
|
|
|
|
static void Lzma2State_Free(void *pp, ISzAlloc *alloc)
|
|
{
|
|
Lzma2Dec_Free((CLzma2Dec *)pp, alloc);
|
|
alloc->Free(alloc, pp);
|
|
}
|
|
|
|
static SRes Lzma2State_SetProps(void *pp, const Byte *props, size_t propSize, ISzAlloc *alloc)
|
|
{
|
|
if (propSize != 1)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
return Lzma2Dec_Allocate((CLzma2Dec *)pp, props[0], alloc);
|
|
}
|
|
|
|
static void Lzma2State_Init(void *pp)
|
|
{
|
|
Lzma2Dec_Init((CLzma2Dec *)pp);
|
|
}
|
|
|
|
static SRes Lzma2State_Code(void *pp, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
|
|
int srcWasFinished, ECoderFinishMode finishMode, int *wasFinished)
|
|
{
|
|
ELzmaStatus status;
|
|
/* ELzmaFinishMode fm = (finishMode == LZMA_FINISH_ANY) ? LZMA_FINISH_ANY : LZMA_FINISH_END; */
|
|
SRes res = Lzma2Dec_DecodeToBuf((CLzma2Dec *)pp, dest, destLen, src, srcLen, (ELzmaFinishMode)finishMode, &status);
|
|
srcWasFinished = srcWasFinished;
|
|
*wasFinished = (status == LZMA_STATUS_FINISHED_WITH_MARK);
|
|
return res;
|
|
}
|
|
|
|
static SRes Lzma2State_SetFromMethod(IStateCoder *p, ISzAlloc *alloc)
|
|
{
|
|
CLzma2Dec *decoder = (CLzma2Dec *)alloc->Alloc(alloc, sizeof(CLzma2Dec));
|
|
p->p = decoder;
|
|
if (decoder == 0)
|
|
return SZ_ERROR_MEM;
|
|
p->Free = Lzma2State_Free;
|
|
p->SetProps = Lzma2State_SetProps;
|
|
p->Init = Lzma2State_Init;
|
|
p->Code = Lzma2State_Code;
|
|
Lzma2Dec_Construct(decoder);
|
|
return SZ_OK;
|
|
}
|
|
|
|
|
|
void MixCoder_Construct(CMixCoder *p, ISzAlloc *alloc)
|
|
{
|
|
int i;
|
|
p->alloc = alloc;
|
|
p->buf = 0;
|
|
p->numCoders = 0;
|
|
for (i = 0; i < MIXCODER_NUM_FILTERS_MAX; i++)
|
|
p->coders[i].p = NULL;
|
|
}
|
|
|
|
void MixCoder_Free(CMixCoder *p)
|
|
{
|
|
int i;
|
|
for (i = 0; i < p->numCoders; i++)
|
|
{
|
|
IStateCoder *sc = &p->coders[i];
|
|
if (p->alloc && sc->p)
|
|
sc->Free(sc->p, p->alloc);
|
|
}
|
|
p->numCoders = 0;
|
|
if (p->buf)
|
|
{
|
|
p->alloc->Free(p->alloc, p->buf);
|
|
p->buf = 0; /* 9.31: the BUG was fixed */
|
|
}
|
|
}
|
|
|
|
void MixCoder_Init(CMixCoder *p)
|
|
{
|
|
int i;
|
|
for (i = 0; i < p->numCoders - 1; i++)
|
|
{
|
|
p->size[i] = 0;
|
|
p->pos[i] = 0;
|
|
p->finished[i] = 0;
|
|
}
|
|
for (i = 0; i < p->numCoders; i++)
|
|
{
|
|
IStateCoder *coder = &p->coders[i];
|
|
coder->Init(coder->p);
|
|
}
|
|
}
|
|
|
|
SRes MixCoder_SetFromMethod(CMixCoder *p, int coderIndex, UInt64 methodId)
|
|
{
|
|
IStateCoder *sc = &p->coders[coderIndex];
|
|
p->ids[coderIndex] = methodId;
|
|
switch(methodId)
|
|
{
|
|
case XZ_ID_LZMA2: return Lzma2State_SetFromMethod(sc, p->alloc);
|
|
#ifdef USE_SUBBLOCK
|
|
case XZ_ID_Subblock: return SbState_SetFromMethod(sc, p->alloc);
|
|
#endif
|
|
}
|
|
if (coderIndex == 0)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
return BraState_SetFromMethod(sc, methodId, 0, p->alloc);
|
|
}
|
|
|
|
SRes MixCoder_Code(CMixCoder *p, Byte *dest, SizeT *destLen,
|
|
const Byte *src, SizeT *srcLen, int srcWasFinished,
|
|
ECoderFinishMode finishMode, ECoderStatus *status)
|
|
{
|
|
SizeT destLenOrig = *destLen;
|
|
SizeT srcLenOrig = *srcLen;
|
|
Bool allFinished = True;
|
|
*destLen = 0;
|
|
*srcLen = 0;
|
|
*status = CODER_STATUS_NOT_FINISHED;
|
|
|
|
if (p->buf == 0)
|
|
{
|
|
p->buf = (Byte *)p->alloc->Alloc(p->alloc, CODER_BUF_SIZE * (MIXCODER_NUM_FILTERS_MAX - 1));
|
|
if (p->buf == 0)
|
|
return SZ_ERROR_MEM;
|
|
}
|
|
|
|
if (p->numCoders != 1)
|
|
finishMode = CODER_FINISH_ANY;
|
|
|
|
for (;;)
|
|
{
|
|
Bool processed = False;
|
|
int i;
|
|
/*
|
|
if (p->numCoders == 1 && *destLen == destLenOrig && finishMode == LZMA_FINISH_ANY)
|
|
break;
|
|
*/
|
|
|
|
for (i = 0; i < p->numCoders; i++)
|
|
{
|
|
SRes res;
|
|
IStateCoder *coder = &p->coders[i];
|
|
Byte *destCur;
|
|
SizeT destLenCur, srcLenCur;
|
|
const Byte *srcCur;
|
|
int srcFinishedCur;
|
|
int encodingWasFinished;
|
|
|
|
if (i == 0)
|
|
{
|
|
srcCur = src;
|
|
srcLenCur = srcLenOrig - *srcLen;
|
|
srcFinishedCur = srcWasFinished;
|
|
}
|
|
else
|
|
{
|
|
srcCur = p->buf + (CODER_BUF_SIZE * (i - 1)) + p->pos[i - 1];
|
|
srcLenCur = p->size[i - 1] - p->pos[i - 1];
|
|
srcFinishedCur = p->finished[i - 1];
|
|
}
|
|
|
|
if (i == p->numCoders - 1)
|
|
{
|
|
destCur = dest;
|
|
destLenCur = destLenOrig - *destLen;
|
|
}
|
|
else
|
|
{
|
|
if (p->pos[i] != p->size[i])
|
|
continue;
|
|
destCur = p->buf + (CODER_BUF_SIZE * i);
|
|
destLenCur = CODER_BUF_SIZE;
|
|
}
|
|
|
|
res = coder->Code(coder->p, destCur, &destLenCur, srcCur, &srcLenCur, srcFinishedCur, finishMode, &encodingWasFinished);
|
|
|
|
if (!encodingWasFinished)
|
|
allFinished = False;
|
|
|
|
if (i == 0)
|
|
{
|
|
*srcLen += srcLenCur;
|
|
src += srcLenCur;
|
|
}
|
|
else
|
|
{
|
|
p->pos[i - 1] += srcLenCur;
|
|
}
|
|
|
|
if (i == p->numCoders - 1)
|
|
{
|
|
*destLen += destLenCur;
|
|
dest += destLenCur;
|
|
}
|
|
else
|
|
{
|
|
p->size[i] = destLenCur;
|
|
p->pos[i] = 0;
|
|
p->finished[i] = encodingWasFinished;
|
|
}
|
|
|
|
if (res != SZ_OK)
|
|
return res;
|
|
|
|
if (destLenCur != 0 || srcLenCur != 0)
|
|
processed = True;
|
|
}
|
|
if (!processed)
|
|
break;
|
|
}
|
|
if (allFinished)
|
|
*status = CODER_STATUS_FINISHED_WITH_MARK;
|
|
return SZ_OK;
|
|
}
|
|
|
|
SRes Xz_ParseHeader(CXzStreamFlags *p, const Byte *buf)
|
|
{
|
|
*p = (CXzStreamFlags)GetBe16(buf + XZ_SIG_SIZE);
|
|
if (CrcCalc(buf + XZ_SIG_SIZE, XZ_STREAM_FLAGS_SIZE) !=
|
|
GetUi32(buf + XZ_SIG_SIZE + XZ_STREAM_FLAGS_SIZE))
|
|
return SZ_ERROR_NO_ARCHIVE;
|
|
return XzFlags_IsSupported(*p) ? SZ_OK : SZ_ERROR_UNSUPPORTED;
|
|
}
|
|
|
|
static Bool Xz_CheckFooter(CXzStreamFlags flags, UInt64 indexSize, const Byte *buf)
|
|
{
|
|
return
|
|
indexSize == (((UInt64)GetUi32(buf + 4) + 1) << 2) &&
|
|
(GetUi32(buf) == CrcCalc(buf + 4, 6) &&
|
|
flags == GetBe16(buf + 8) &&
|
|
memcmp(buf + 10, XZ_FOOTER_SIG, XZ_FOOTER_SIG_SIZE) == 0);
|
|
}
|
|
|
|
#define READ_VARINT_AND_CHECK(buf, pos, size, res) \
|
|
{ unsigned s = Xz_ReadVarInt(buf + pos, size - pos, res); \
|
|
if (s == 0) return SZ_ERROR_ARCHIVE; pos += s; }
|
|
|
|
|
|
SRes XzBlock_Parse(CXzBlock *p, const Byte *header)
|
|
{
|
|
unsigned pos;
|
|
int numFilters, i;
|
|
UInt32 headerSize = (UInt32)header[0] << 2;
|
|
|
|
if (CrcCalc(header, headerSize) != GetUi32(header + headerSize))
|
|
return SZ_ERROR_ARCHIVE;
|
|
|
|
pos = 1;
|
|
if (pos == headerSize)
|
|
return SZ_ERROR_ARCHIVE;
|
|
p->flags = header[pos++];
|
|
|
|
if (XzBlock_HasPackSize(p))
|
|
{
|
|
READ_VARINT_AND_CHECK(header, pos, headerSize, &p->packSize);
|
|
if (p->packSize == 0 || p->packSize + headerSize >= (UInt64)1 << 63)
|
|
return SZ_ERROR_ARCHIVE;
|
|
}
|
|
|
|
if (XzBlock_HasUnpackSize(p))
|
|
READ_VARINT_AND_CHECK(header, pos, headerSize, &p->unpackSize);
|
|
|
|
numFilters = XzBlock_GetNumFilters(p);
|
|
for (i = 0; i < numFilters; i++)
|
|
{
|
|
CXzFilter *filter = p->filters + i;
|
|
UInt64 size;
|
|
READ_VARINT_AND_CHECK(header, pos, headerSize, &filter->id);
|
|
READ_VARINT_AND_CHECK(header, pos, headerSize, &size);
|
|
if (size > headerSize - pos || size > XZ_FILTER_PROPS_SIZE_MAX)
|
|
return SZ_ERROR_ARCHIVE;
|
|
filter->propsSize = (UInt32)size;
|
|
memcpy(filter->props, header + pos, (size_t)size);
|
|
pos += (unsigned)size;
|
|
|
|
#ifdef XZ_DUMP
|
|
printf("\nf[%d] = %2X: ", i, filter->id);
|
|
{
|
|
int i;
|
|
for (i = 0; i < size; i++)
|
|
printf(" %2X", filter->props[i]);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
while (pos < headerSize)
|
|
if (header[pos++] != 0)
|
|
return SZ_ERROR_ARCHIVE;
|
|
return SZ_OK;
|
|
}
|
|
|
|
SRes XzDec_Init(CMixCoder *p, const CXzBlock *block)
|
|
{
|
|
int i;
|
|
Bool needReInit = True;
|
|
int numFilters = XzBlock_GetNumFilters(block);
|
|
if (numFilters == p->numCoders)
|
|
{
|
|
for (i = 0; i < numFilters; i++)
|
|
if (p->ids[i] != block->filters[numFilters - 1 - i].id)
|
|
break;
|
|
needReInit = (i != numFilters);
|
|
}
|
|
if (needReInit)
|
|
{
|
|
MixCoder_Free(p);
|
|
p->numCoders = numFilters;
|
|
for (i = 0; i < numFilters; i++)
|
|
{
|
|
const CXzFilter *f = &block->filters[numFilters - 1 - i];
|
|
RINOK(MixCoder_SetFromMethod(p, i, f->id));
|
|
}
|
|
}
|
|
for (i = 0; i < numFilters; i++)
|
|
{
|
|
const CXzFilter *f = &block->filters[numFilters - 1 - i];
|
|
IStateCoder *sc = &p->coders[i];
|
|
RINOK(sc->SetProps(sc->p, f->props, f->propsSize, p->alloc));
|
|
}
|
|
MixCoder_Init(p);
|
|
return SZ_OK;
|
|
}
|
|
|
|
void XzUnpacker_Init(CXzUnpacker *p)
|
|
{
|
|
p->state = XZ_STATE_STREAM_HEADER;
|
|
p->pos = 0;
|
|
p->numStartedStreams = 0;
|
|
p->numFinishedStreams = 0;
|
|
p->numTotalBlocks = 0;
|
|
p->padSize = 0;
|
|
}
|
|
|
|
void XzUnpacker_Construct(CXzUnpacker *p, ISzAlloc *alloc)
|
|
{
|
|
MixCoder_Construct(&p->decoder, alloc);
|
|
XzUnpacker_Init(p);
|
|
}
|
|
|
|
void XzUnpacker_Free(CXzUnpacker *p)
|
|
{
|
|
MixCoder_Free(&p->decoder);
|
|
}
|
|
|
|
SRes XzUnpacker_Code(CXzUnpacker *p, Byte *dest, SizeT *destLen,
|
|
const Byte *src, SizeT *srcLen, ECoderFinishMode finishMode, ECoderStatus *status)
|
|
{
|
|
SizeT destLenOrig = *destLen;
|
|
SizeT srcLenOrig = *srcLen;
|
|
*destLen = 0;
|
|
*srcLen = 0;
|
|
*status = CODER_STATUS_NOT_SPECIFIED;
|
|
for (;;)
|
|
{
|
|
SizeT srcRem = srcLenOrig - *srcLen;
|
|
|
|
if (p->state == XZ_STATE_BLOCK)
|
|
{
|
|
SizeT destLen2 = destLenOrig - *destLen;
|
|
SizeT srcLen2 = srcLenOrig - *srcLen;
|
|
SRes res;
|
|
if (srcLen2 == 0 && destLen2 == 0)
|
|
{
|
|
*status = CODER_STATUS_NOT_FINISHED;
|
|
return SZ_OK;
|
|
}
|
|
|
|
res = MixCoder_Code(&p->decoder, dest, &destLen2, src, &srcLen2, False, finishMode, status);
|
|
XzCheck_Update(&p->check, dest, destLen2);
|
|
|
|
(*srcLen) += srcLen2;
|
|
src += srcLen2;
|
|
p->packSize += srcLen2;
|
|
|
|
(*destLen) += destLen2;
|
|
dest += destLen2;
|
|
p->unpackSize += destLen2;
|
|
|
|
RINOK(res);
|
|
|
|
if (*status == CODER_STATUS_FINISHED_WITH_MARK)
|
|
{
|
|
Byte temp[32];
|
|
unsigned num = Xz_WriteVarInt(temp, p->packSize + p->blockHeaderSize + XzFlags_GetCheckSize(p->streamFlags));
|
|
num += Xz_WriteVarInt(temp + num, p->unpackSize);
|
|
Sha256_Update(&p->sha, temp, num);
|
|
p->indexSize += num;
|
|
p->numBlocks++;
|
|
|
|
p->state = XZ_STATE_BLOCK_FOOTER;
|
|
p->pos = 0;
|
|
p->alignPos = 0;
|
|
}
|
|
else if (srcLen2 == 0 && destLen2 == 0)
|
|
return SZ_OK;
|
|
|
|
continue;
|
|
}
|
|
|
|
if (srcRem == 0)
|
|
{
|
|
*status = CODER_STATUS_NEEDS_MORE_INPUT;
|
|
return SZ_OK;
|
|
}
|
|
|
|
switch (p->state)
|
|
{
|
|
case XZ_STATE_STREAM_HEADER:
|
|
{
|
|
if (p->pos < XZ_STREAM_HEADER_SIZE)
|
|
{
|
|
if (p->pos < XZ_SIG_SIZE && *src != XZ_SIG[p->pos])
|
|
return SZ_ERROR_NO_ARCHIVE;
|
|
p->buf[p->pos++] = *src++;
|
|
(*srcLen)++;
|
|
}
|
|
else
|
|
{
|
|
RINOK(Xz_ParseHeader(&p->streamFlags, p->buf));
|
|
p->numStartedStreams++;
|
|
p->state = XZ_STATE_BLOCK_HEADER;
|
|
Sha256_Init(&p->sha);
|
|
p->indexSize = 0;
|
|
p->numBlocks = 0;
|
|
p->pos = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case XZ_STATE_BLOCK_HEADER:
|
|
{
|
|
if (p->pos == 0)
|
|
{
|
|
p->buf[p->pos++] = *src++;
|
|
(*srcLen)++;
|
|
if (p->buf[0] == 0)
|
|
{
|
|
p->indexPreSize = 1 + Xz_WriteVarInt(p->buf + 1, p->numBlocks);
|
|
p->indexPos = p->indexPreSize;
|
|
p->indexSize += p->indexPreSize;
|
|
Sha256_Final(&p->sha, p->shaDigest);
|
|
Sha256_Init(&p->sha);
|
|
p->crc = CrcUpdate(CRC_INIT_VAL, p->buf, p->indexPreSize);
|
|
p->state = XZ_STATE_STREAM_INDEX;
|
|
}
|
|
p->blockHeaderSize = ((UInt32)p->buf[0] << 2) + 4;
|
|
}
|
|
else if (p->pos != p->blockHeaderSize)
|
|
{
|
|
UInt32 cur = p->blockHeaderSize - p->pos;
|
|
if (cur > srcRem)
|
|
cur = (UInt32)srcRem;
|
|
memcpy(p->buf + p->pos, src, cur);
|
|
p->pos += cur;
|
|
(*srcLen) += cur;
|
|
src += cur;
|
|
}
|
|
else
|
|
{
|
|
RINOK(XzBlock_Parse(&p->block, p->buf));
|
|
p->numTotalBlocks++;
|
|
p->state = XZ_STATE_BLOCK;
|
|
p->packSize = 0;
|
|
p->unpackSize = 0;
|
|
XzCheck_Init(&p->check, XzFlags_GetCheckType(p->streamFlags));
|
|
RINOK(XzDec_Init(&p->decoder, &p->block));
|
|
}
|
|
break;
|
|
}
|
|
|
|
case XZ_STATE_BLOCK_FOOTER:
|
|
{
|
|
if (((p->packSize + p->alignPos) & 3) != 0)
|
|
{
|
|
(*srcLen)++;
|
|
p->alignPos++;
|
|
if (*src++ != 0)
|
|
return SZ_ERROR_CRC;
|
|
}
|
|
else
|
|
{
|
|
UInt32 checkSize = XzFlags_GetCheckSize(p->streamFlags);
|
|
UInt32 cur = checkSize - p->pos;
|
|
if (cur != 0)
|
|
{
|
|
if (cur > srcRem)
|
|
cur = (UInt32)srcRem;
|
|
memcpy(p->buf + p->pos, src, cur);
|
|
p->pos += cur;
|
|
(*srcLen) += cur;
|
|
src += cur;
|
|
}
|
|
else
|
|
{
|
|
Byte digest[XZ_CHECK_SIZE_MAX];
|
|
p->state = XZ_STATE_BLOCK_HEADER;
|
|
p->pos = 0;
|
|
if (XzCheck_Final(&p->check, digest) && memcmp(digest, p->buf, checkSize) != 0)
|
|
return SZ_ERROR_CRC;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case XZ_STATE_STREAM_INDEX:
|
|
{
|
|
if (p->pos < p->indexPreSize)
|
|
{
|
|
(*srcLen)++;
|
|
if (*src++ != p->buf[p->pos++])
|
|
return SZ_ERROR_CRC;
|
|
}
|
|
else
|
|
{
|
|
if (p->indexPos < p->indexSize)
|
|
{
|
|
UInt64 cur = p->indexSize - p->indexPos;
|
|
if (srcRem > cur)
|
|
srcRem = (SizeT)cur;
|
|
p->crc = CrcUpdate(p->crc, src, srcRem);
|
|
Sha256_Update(&p->sha, src, srcRem);
|
|
(*srcLen) += srcRem;
|
|
src += srcRem;
|
|
p->indexPos += srcRem;
|
|
}
|
|
else if ((p->indexPos & 3) != 0)
|
|
{
|
|
Byte b = *src++;
|
|
p->crc = CRC_UPDATE_BYTE(p->crc, b);
|
|
(*srcLen)++;
|
|
p->indexPos++;
|
|
p->indexSize++;
|
|
if (b != 0)
|
|
return SZ_ERROR_CRC;
|
|
}
|
|
else
|
|
{
|
|
Byte digest[SHA256_DIGEST_SIZE];
|
|
p->state = XZ_STATE_STREAM_INDEX_CRC;
|
|
p->indexSize += 4;
|
|
p->pos = 0;
|
|
Sha256_Final(&p->sha, digest);
|
|
if (memcmp(digest, p->shaDigest, SHA256_DIGEST_SIZE) != 0)
|
|
return SZ_ERROR_CRC;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case XZ_STATE_STREAM_INDEX_CRC:
|
|
{
|
|
if (p->pos < 4)
|
|
{
|
|
(*srcLen)++;
|
|
p->buf[p->pos++] = *src++;
|
|
}
|
|
else
|
|
{
|
|
p->state = XZ_STATE_STREAM_FOOTER;
|
|
p->pos = 0;
|
|
if (CRC_GET_DIGEST(p->crc) != GetUi32(p->buf))
|
|
return SZ_ERROR_CRC;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case XZ_STATE_STREAM_FOOTER:
|
|
{
|
|
UInt32 cur = XZ_STREAM_FOOTER_SIZE - p->pos;
|
|
if (cur > srcRem)
|
|
cur = (UInt32)srcRem;
|
|
memcpy(p->buf + p->pos, src, cur);
|
|
p->pos += cur;
|
|
(*srcLen) += cur;
|
|
src += cur;
|
|
if (p->pos == XZ_STREAM_FOOTER_SIZE)
|
|
{
|
|
p->state = XZ_STATE_STREAM_PADDING;
|
|
p->numFinishedStreams++;
|
|
p->padSize = 0;
|
|
if (!Xz_CheckFooter(p->streamFlags, p->indexSize, p->buf))
|
|
return SZ_ERROR_CRC;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case XZ_STATE_STREAM_PADDING:
|
|
{
|
|
if (*src != 0)
|
|
{
|
|
if (((UInt32)p->padSize & 3) != 0)
|
|
return SZ_ERROR_NO_ARCHIVE;
|
|
p->pos = 0;
|
|
p->state = XZ_STATE_STREAM_HEADER;
|
|
}
|
|
else
|
|
{
|
|
(*srcLen)++;
|
|
src++;
|
|
p->padSize++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case XZ_STATE_BLOCK: break; /* to disable GCC warning */
|
|
}
|
|
}
|
|
/*
|
|
if (p->state == XZ_STATE_FINISHED)
|
|
*status = CODER_STATUS_FINISHED_WITH_MARK;
|
|
return SZ_OK;
|
|
*/
|
|
}
|
|
|
|
Bool XzUnpacker_IsStreamWasFinished(CXzUnpacker *p)
|
|
{
|
|
return (p->state == XZ_STATE_STREAM_PADDING) && (((UInt32)p->padSize & 3) == 0);
|
|
}
|
|
|
|
UInt64 XzUnpacker_GetExtraSize(CXzUnpacker *p)
|
|
{
|
|
UInt64 num = 0;
|
|
if (p->state == XZ_STATE_STREAM_PADDING)
|
|
num += p->padSize;
|
|
else if (p->state == XZ_STATE_STREAM_HEADER)
|
|
num += p->padSize + p->pos;
|
|
return num;
|
|
}
|