diff options
Diffstat (limited to 'src/lib/lib7z/XzDec.c')
-rw-r--r-- | src/lib/lib7z/XzDec.c | 889 |
1 files changed, 0 insertions, 889 deletions
diff --git a/src/lib/lib7z/XzDec.c b/src/lib/lib7z/XzDec.c deleted file mode 100644 index f3a19e782fb..00000000000 --- a/src/lib/lib7z/XzDec.c +++ /dev/null @@ -1,889 +0,0 @@ -/* XzDec.c -- Xz Decode -2011-02-07 : Igor Pavlov : Public domain */ - -/* #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 = 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, finishMode, &status); - srcWasFinished = srcWasFinished; - *wasFinished = (status == LZMA_STATUS_FINISHED_WITH_MARK); - return res; -} - -static SRes Lzma2State_SetFromMethod(IStateCoder *p, ISzAlloc *alloc) -{ - CLzma2Dec *decoder = 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); -} - -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 = 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->numStreams = 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, int 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->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->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->numStreams++; - 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); -} |