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-rwxr-xr-xC/XzDec.c875
1 files changed, 875 insertions, 0 deletions
diff --git a/C/XzDec.c b/C/XzDec.c
new file mode 100755
index 0000000..2eca1af
--- /dev/null
+++ b/C/XzDec.c
@@ -0,0 +1,875 @@
+/* XzDec.c -- Xz Decode
+2010-04-16 : 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 "SbDec.h"
+#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->encodeMode = 0;
+ 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, 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;
+ 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)
+{
+ CSubblockDec *p = (CSubblockDec *)pp;
+ SubblockDec_Free(p, alloc);
+ 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)
+{
+ SubblockDec_Init((CSubblockDec *)pp);
+}
+
+static SRes SbState_Code(void *pp, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
+ int srcWasFinished, ECoderFinishMode finishMode, int *wasFinished)
+{
+ ECoderStatus status;
+ SRes res = SubblockDec_Decode((CSubblockDec *)pp, dest, destLen, src, srcLen, finishMode, &status);
+ srcWasFinished = srcWasFinished;
+ *wasFinished = (status == LZMA_STATUS_FINISHED_WITH_MARK);
+ return res;
+}
+
+SRes SbState_SetFromMethod(IStateCoder *p, ISzAlloc *alloc)
+{
+ CSubblockDec *decoder;
+ p->p = 0;
+ decoder = alloc->Alloc(alloc, sizeof(CSubblockDec));
+ 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;
+ SubblockDec_Construct(decoder);
+ 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, 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;
+}
+
+SRes XzUnpacker_Create(CXzUnpacker *p, ISzAlloc *alloc)
+{
+ MixCoder_Construct(&p->decoder, alloc);
+ p->state = XZ_STATE_STREAM_HEADER;
+ p->pos = 0;
+ p->numStreams = 0;
+ return SZ_OK;
+}
+
+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);
+}