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Diffstat (limited to '')
| -rw-r--r-- | LzmaDec.c | 960 |
1 files changed, 960 insertions, 0 deletions
diff --git a/LzmaDec.c b/LzmaDec.c new file mode 100644 index 0000000..b4b7e27 --- /dev/null +++ b/LzmaDec.c @@ -0,0 +1,960 @@ +/* LzmaDec.c -- LZMA Decoder
+2009-09-20 : Igor Pavlov : Public domain */
+
+#define _FILE_OFFSET_BITS 64
+
+#include "LzmaDec.h"
+
+#include <string.h>
+
+#define kNumTopBits 24
+#define kTopValue ((UInt32)1 << kNumTopBits)
+
+#define kNumBitModelTotalBits 11
+#define kBitModelTotal (1 << kNumBitModelTotalBits)
+#define kNumMoveBits 5
+
+#define RC_INIT_SIZE 5
+
+#define NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | (*buf++); }
+
+#define IF_BIT_0(p) ttt = *(p); NORMALIZE; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)
+#define UPDATE_0(p) range = bound; *(p) = (CLzmaProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));
+#define UPDATE_1(p) range -= bound; code -= bound; *(p) = (CLzmaProb)(ttt - (ttt >> kNumMoveBits));
+#define GET_BIT2(p, i, A0, A1) IF_BIT_0(p) \
+ { UPDATE_0(p); i = (i + i); A0; } else \
+ { UPDATE_1(p); i = (i + i) + 1; A1; }
+#define GET_BIT(p, i) GET_BIT2(p, i, ; , ;)
+
+#define TREE_GET_BIT(probs, i) { GET_BIT((probs + i), i); }
+#define TREE_DECODE(probs, limit, i) \
+ { i = 1; do { TREE_GET_BIT(probs, i); } while (i < limit); i -= limit; }
+
+/* #define _LZMA_SIZE_OPT */
+
+#ifdef _LZMA_SIZE_OPT
+#define TREE_6_DECODE(probs, i) TREE_DECODE(probs, (1 << 6), i)
+#else
+#define TREE_6_DECODE(probs, i) \
+ { i = 1; \
+ TREE_GET_BIT(probs, i); \
+ TREE_GET_BIT(probs, i); \
+ TREE_GET_BIT(probs, i); \
+ TREE_GET_BIT(probs, i); \
+ TREE_GET_BIT(probs, i); \
+ TREE_GET_BIT(probs, i); \
+ i -= 0x40; }
+#endif
+
+#define NORMALIZE_CHECK if (range < kTopValue) { if (buf >= bufLimit) return DUMMY_ERROR; range <<= 8; code = (code << 8) | (*buf++); }
+
+#define IF_BIT_0_CHECK(p) ttt = *(p); NORMALIZE_CHECK; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)
+#define UPDATE_0_CHECK range = bound;
+#define UPDATE_1_CHECK range -= bound; code -= bound;
+#define GET_BIT2_CHECK(p, i, A0, A1) IF_BIT_0_CHECK(p) \
+ { UPDATE_0_CHECK; i = (i + i); A0; } else \
+ { UPDATE_1_CHECK; i = (i + i) + 1; A1; }
+#define GET_BIT_CHECK(p, i) GET_BIT2_CHECK(p, i, ; , ;)
+#define TREE_DECODE_CHECK(probs, limit, i) \
+ { i = 1; do { GET_BIT_CHECK(probs + i, i) } while (i < limit); i -= limit; }
+
+
+#define kNumPosBitsMax 4
+#define kNumPosStatesMax (1 << kNumPosBitsMax)
+
+#define kLenNumLowBits 3
+#define kLenNumLowSymbols (1 << kLenNumLowBits)
+#define kLenNumMidBits 3
+#define kLenNumMidSymbols (1 << kLenNumMidBits)
+#define kLenNumHighBits 8
+#define kLenNumHighSymbols (1 << kLenNumHighBits)
+
+#define LenChoice 0
+#define LenChoice2 (LenChoice + 1)
+#define LenLow (LenChoice2 + 1)
+#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
+#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
+#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
+
+
+#define kNumStates 12
+#define kNumLitStates 7
+
+#define kStartPosModelIndex 4
+#define kEndPosModelIndex 14
+#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
+
+#define kNumPosSlotBits 6
+#define kNumLenToPosStates 4
+
+#define kNumAlignBits 4
+#define kAlignTableSize (1 << kNumAlignBits)
+
+#define kMatchMinLen 2
+#define kMatchSpecLenStart (kMatchMinLen + kLenNumLowSymbols + kLenNumMidSymbols + kLenNumHighSymbols)
+
+#define IsMatch 0
+#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
+#define IsRepG0 (IsRep + kNumStates)
+#define IsRepG1 (IsRepG0 + kNumStates)
+#define IsRepG2 (IsRepG1 + kNumStates)
+#define IsRep0Long (IsRepG2 + kNumStates)
+#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
+#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
+#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
+#define LenCoder (Align + kAlignTableSize)
+#define RepLenCoder (LenCoder + kNumLenProbs)
+#define Literal (RepLenCoder + kNumLenProbs)
+
+#define LZMA_BASE_SIZE 1846
+#define LZMA_LIT_SIZE 768
+
+#define LzmaProps_GetNumProbs(p) ((UInt32)LZMA_BASE_SIZE + (LZMA_LIT_SIZE << ((p)->lc + (p)->lp)))
+
+#if Literal != LZMA_BASE_SIZE
+StopCompilingDueBUG
+#endif
+
+#define LZMA_DIC_MIN (1 << 12)
+
+/* First LZMA-symbol is always decoded.
+And it decodes new LZMA-symbols while (buf < bufLimit), but "buf" is without last normalization
+Out:
+ Result:
+ SZ_OK - OK
+ SZ_ERROR_DATA - Error
+ p->remainLen:
+ < kMatchSpecLenStart : normal remain
+ = kMatchSpecLenStart : finished
+ = kMatchSpecLenStart + 1 : Flush marker
+ = kMatchSpecLenStart + 2 : State Init Marker
+*/
+
+static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, SizeT limit, const Byte *bufLimit)
+{
+ CLzmaProb *probs = p->probs;
+
+ unsigned state = p->state;
+ UInt32 rep0 = p->reps[0], rep1 = p->reps[1], rep2 = p->reps[2], rep3 = p->reps[3];
+ unsigned pbMask = ((unsigned)1 << (p->prop.pb)) - 1;
+ unsigned lpMask = ((unsigned)1 << (p->prop.lp)) - 1;
+ unsigned lc = p->prop.lc;
+
+ Byte *dic = p->dic;
+ SizeT dicBufSize = p->dicBufSize;
+ SizeT dicPos = p->dicPos;
+
+ UInt32 processedPos = p->processedPos;
+ UInt32 checkDicSize = p->checkDicSize;
+ unsigned len = 0;
+
+ const Byte *buf = p->buf;
+ UInt32 range = p->range;
+ UInt32 code = p->code;
+
+ do
+ {
+ CLzmaProb *prob;
+ UInt32 bound;
+ unsigned ttt;
+ unsigned posState = processedPos & pbMask;
+
+ prob = probs + IsMatch + (state << kNumPosBitsMax) + posState;
+ IF_BIT_0(prob)
+ {
+ unsigned symbol;
+ UPDATE_0(prob);
+ prob = probs + Literal;
+ if (checkDicSize != 0 || processedPos != 0)
+ prob += (LZMA_LIT_SIZE * (((processedPos & lpMask) << lc) +
+ (dic[(dicPos == 0 ? dicBufSize : dicPos) - 1] >> (8 - lc))));
+
+ if (state < kNumLitStates)
+ {
+ state -= (state < 4) ? state : 3;
+ symbol = 1;
+ do { GET_BIT(prob + symbol, symbol) } while (symbol < 0x100);
+ }
+ else
+ {
+ unsigned matchByte = p->dic[(dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0)];
+ unsigned offs = 0x100;
+ state -= (state < 10) ? 3 : 6;
+ symbol = 1;
+ do
+ {
+ unsigned bit;
+ CLzmaProb *probLit;
+ matchByte <<= 1;
+ bit = (matchByte & offs);
+ probLit = prob + offs + bit + symbol;
+ GET_BIT2(probLit, symbol, offs &= ~bit, offs &= bit)
+ }
+ while (symbol < 0x100);
+ }
+ dic[dicPos++] = (Byte)symbol;
+ processedPos++;
+ continue;
+ }
+ else
+ {
+ UPDATE_1(prob);
+ prob = probs + IsRep + state;
+ IF_BIT_0(prob)
+ {
+ UPDATE_0(prob);
+ state += kNumStates;
+ prob = probs + LenCoder;
+ }
+ else
+ {
+ UPDATE_1(prob);
+ if (checkDicSize == 0 && processedPos == 0)
+ return SZ_ERROR_DATA;
+ prob = probs + IsRepG0 + state;
+ IF_BIT_0(prob)
+ {
+ UPDATE_0(prob);
+ prob = probs + IsRep0Long + (state << kNumPosBitsMax) + posState;
+ IF_BIT_0(prob)
+ {
+ UPDATE_0(prob);
+ dic[dicPos] = dic[(dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0)];
+ dicPos++;
+ processedPos++;
+ state = state < kNumLitStates ? 9 : 11;
+ continue;
+ }
+ UPDATE_1(prob);
+ }
+ else
+ {
+ UInt32 distance;
+ UPDATE_1(prob);
+ prob = probs + IsRepG1 + state;
+ IF_BIT_0(prob)
+ {
+ UPDATE_0(prob);
+ distance = rep1;
+ }
+ else
+ {
+ UPDATE_1(prob);
+ prob = probs + IsRepG2 + state;
+ IF_BIT_0(prob)
+ {
+ UPDATE_0(prob);
+ distance = rep2;
+ }
+ else
+ {
+ UPDATE_1(prob);
+ distance = rep3;
+ rep3 = rep2;
+ }
+ rep2 = rep1;
+ }
+ rep1 = rep0;
+ rep0 = distance;
+ }
+ state = state < kNumLitStates ? 8 : 11;
+ prob = probs + RepLenCoder;
+ }
+ {
+ unsigned limit, offset;
+ CLzmaProb *probLen = prob + LenChoice;
+ IF_BIT_0(probLen)
+ {
+ UPDATE_0(probLen);
+ probLen = prob + LenLow + (posState << kLenNumLowBits);
+ offset = 0;
+ limit = (1 << kLenNumLowBits);
+ }
+ else
+ {
+ UPDATE_1(probLen);
+ probLen = prob + LenChoice2;
+ IF_BIT_0(probLen)
+ {
+ UPDATE_0(probLen);
+ probLen = prob + LenMid + (posState << kLenNumMidBits);
+ offset = kLenNumLowSymbols;
+ limit = (1 << kLenNumMidBits);
+ }
+ else
+ {
+ UPDATE_1(probLen);
+ probLen = prob + LenHigh;
+ offset = kLenNumLowSymbols + kLenNumMidSymbols;
+ limit = (1 << kLenNumHighBits);
+ }
+ }
+ TREE_DECODE(probLen, limit, len);
+ len += offset;
+ }
+
+ if (state >= kNumStates)
+ {
+ UInt32 distance;
+ prob = probs + PosSlot +
+ ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << kNumPosSlotBits);
+ TREE_6_DECODE(prob, distance);
+ if (distance >= kStartPosModelIndex)
+ {
+ unsigned posSlot = (unsigned)distance;
+ int numDirectBits = (int)(((distance >> 1) - 1));
+ distance = (2 | (distance & 1));
+ if (posSlot < kEndPosModelIndex)
+ {
+ distance <<= numDirectBits;
+ prob = probs + SpecPos + distance - posSlot - 1;
+ {
+ UInt32 mask = 1;
+ unsigned i = 1;
+ do
+ {
+ GET_BIT2(prob + i, i, ; , distance |= mask);
+ mask <<= 1;
+ }
+ while (--numDirectBits != 0);
+ }
+ }
+ else
+ {
+ numDirectBits -= kNumAlignBits;
+ do
+ {
+ NORMALIZE
+ range >>= 1;
+
+ {
+ UInt32 t;
+ code -= range;
+ t = (0 - ((UInt32)code >> 31)); /* (UInt32)((Int32)code >> 31) */
+ distance = (distance << 1) + (t + 1);
+ code += range & t;
+ }
+ /*
+ distance <<= 1;
+ if (code >= range)
+ {
+ code -= range;
+ distance |= 1;
+ }
+ */
+ }
+ while (--numDirectBits != 0);
+ prob = probs + Align;
+ distance <<= kNumAlignBits;
+ {
+ unsigned i = 1;
+ GET_BIT2(prob + i, i, ; , distance |= 1);
+ GET_BIT2(prob + i, i, ; , distance |= 2);
+ GET_BIT2(prob + i, i, ; , distance |= 4);
+ GET_BIT2(prob + i, i, ; , distance |= 8);
+ }
+ if (distance == (UInt32)0xFFFFFFFF)
+ {
+ len += kMatchSpecLenStart;
+ state -= kNumStates;
+ break;
+ }
+ }
+ }
+ rep3 = rep2;
+ rep2 = rep1;
+ rep1 = rep0;
+ rep0 = distance + 1;
+ if (checkDicSize == 0)
+ {
+ if (distance >= processedPos)
+ return SZ_ERROR_DATA;
+ }
+ else if (distance >= checkDicSize)
+ return SZ_ERROR_DATA;
+ state = (state < kNumStates + kNumLitStates) ? kNumLitStates : kNumLitStates + 3;
+ }
+
+ len += kMatchMinLen;
+
+ if (limit == dicPos)
+ return SZ_ERROR_DATA;
+ {
+ SizeT rem = limit - dicPos;
+ unsigned curLen = ((rem < len) ? (unsigned)rem : len);
+ SizeT pos = (dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0);
+
+ processedPos += curLen;
+
+ len -= curLen;
+ if (pos + curLen <= dicBufSize)
+ {
+ Byte *dest = dic + dicPos;
+ ptrdiff_t src = (ptrdiff_t)pos - (ptrdiff_t)dicPos;
+ const Byte *lim = dest + curLen;
+ dicPos += curLen;
+ do
+ *(dest) = (Byte)*(dest + src);
+ while (++dest != lim);
+ }
+ else
+ {
+ do
+ {
+ dic[dicPos++] = dic[pos];
+ if (++pos == dicBufSize)
+ pos = 0;
+ }
+ while (--curLen != 0);
+ }
+ }
+ }
+ }
+ while (dicPos < limit && buf < bufLimit);
+ NORMALIZE;
+ p->buf = buf;
+ p->range = range;
+ p->code = code;
+ p->remainLen = len;
+ p->dicPos = dicPos;
+ p->processedPos = processedPos;
+ p->reps[0] = rep0;
+ p->reps[1] = rep1;
+ p->reps[2] = rep2;
+ p->reps[3] = rep3;
+ p->state = state;
+
+ return SZ_OK;
+}
+
+static void MY_FAST_CALL LzmaDec_WriteRem(CLzmaDec *p, SizeT limit)
+{
+ if (p->remainLen != 0 && p->remainLen < kMatchSpecLenStart)
+ {
+ Byte *dic = p->dic;
+ SizeT dicPos = p->dicPos;
+ SizeT dicBufSize = p->dicBufSize;
+ unsigned len = p->remainLen;
+ UInt32 rep0 = p->reps[0];
+ if (limit - dicPos < len)
+ len = (unsigned)(limit - dicPos);
+
+ if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= len)
+ p->checkDicSize = p->prop.dicSize;
+
+ p->processedPos += len;
+ p->remainLen -= len;
+ while (len-- != 0)
+ {
+ dic[dicPos] = dic[(dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0)];
+ dicPos++;
+ }
+ p->dicPos = dicPos;
+ }
+}
+
+static int MY_FAST_CALL LzmaDec_DecodeReal2(CLzmaDec *p, SizeT limit, const Byte *bufLimit)
+{
+ do
+ {
+ SizeT limit2 = limit;
+ if (p->checkDicSize == 0)
+ {
+ UInt32 rem = p->prop.dicSize - p->processedPos;
+ if (limit - p->dicPos > rem)
+ limit2 = p->dicPos + rem;
+ }
+ RINOK(LzmaDec_DecodeReal(p, limit2, bufLimit));
+ if (p->processedPos >= p->prop.dicSize)
+ p->checkDicSize = p->prop.dicSize;
+ LzmaDec_WriteRem(p, limit);
+ }
+ while (p->dicPos < limit && p->buf < bufLimit && p->remainLen < kMatchSpecLenStart);
+
+ if (p->remainLen > kMatchSpecLenStart)
+ {
+ p->remainLen = kMatchSpecLenStart;
+ }
+ return 0;
+}
+
+typedef enum
+{
+ DUMMY_ERROR, /* unexpected end of input stream */
+ DUMMY_LIT,
+ DUMMY_MATCH,
+ DUMMY_REP
+} ELzmaDummy;
+
+static ELzmaDummy LzmaDec_TryDummy(const CLzmaDec *p, const Byte *buf, SizeT inSize)
+{
+ UInt32 range = p->range;
+ UInt32 code = p->code;
+ const Byte *bufLimit = buf + inSize;
+ CLzmaProb *probs = p->probs;
+ unsigned state = p->state;
+ ELzmaDummy res;
+
+ {
+ CLzmaProb *prob;
+ UInt32 bound;
+ unsigned ttt;
+ unsigned posState = (p->processedPos) & ((1 << p->prop.pb) - 1);
+
+ prob = probs + IsMatch + (state << kNumPosBitsMax) + posState;
+ IF_BIT_0_CHECK(prob)
+ {
+ UPDATE_0_CHECK
+
+ /* if (bufLimit - buf >= 7) return DUMMY_LIT; */
+
+ prob = probs + Literal;
+ if (p->checkDicSize != 0 || p->processedPos != 0)
+ prob += (LZMA_LIT_SIZE *
+ ((((p->processedPos) & ((1 << (p->prop.lp)) - 1)) << p->prop.lc) +
+ (p->dic[(p->dicPos == 0 ? p->dicBufSize : p->dicPos) - 1] >> (8 - p->prop.lc))));
+
+ if (state < kNumLitStates)
+ {
+ unsigned symbol = 1;
+ do { GET_BIT_CHECK(prob + symbol, symbol) } while (symbol < 0x100);
+ }
+ else
+ {
+ unsigned matchByte = p->dic[p->dicPos - p->reps[0] +
+ ((p->dicPos < p->reps[0]) ? p->dicBufSize : 0)];
+ unsigned offs = 0x100;
+ unsigned symbol = 1;
+ do
+ {
+ unsigned bit;
+ CLzmaProb *probLit;
+ matchByte <<= 1;
+ bit = (matchByte & offs);
+ probLit = prob + offs + bit + symbol;
+ GET_BIT2_CHECK(probLit, symbol, offs &= ~bit, offs &= bit)
+ }
+ while (symbol < 0x100);
+ }
+ res = DUMMY_LIT;
+ }
+ else
+ {
+ unsigned len;
+ UPDATE_1_CHECK;
+
+ prob = probs + IsRep + state;
+ IF_BIT_0_CHECK(prob)
+ {
+ UPDATE_0_CHECK;
+ state = 0;
+ prob = probs + LenCoder;
+ res = DUMMY_MATCH;
+ }
+ else
+ {
+ UPDATE_1_CHECK;
+ res = DUMMY_REP;
+ prob = probs + IsRepG0 + state;
+ IF_BIT_0_CHECK(prob)
+ {
+ UPDATE_0_CHECK;
+ prob = probs + IsRep0Long + (state << kNumPosBitsMax) + posState;
+ IF_BIT_0_CHECK(prob)
+ {
+ UPDATE_0_CHECK;
+ NORMALIZE_CHECK;
+ return DUMMY_REP;
+ }
+ else
+ {
+ UPDATE_1_CHECK;
+ }
+ }
+ else
+ {
+ UPDATE_1_CHECK;
+ prob = probs + IsRepG1 + state;
+ IF_BIT_0_CHECK(prob)
+ {
+ UPDATE_0_CHECK;
+ }
+ else
+ {
+ UPDATE_1_CHECK;
+ prob = probs + IsRepG2 + state;
+ IF_BIT_0_CHECK(prob)
+ {
+ UPDATE_0_CHECK;
+ }
+ else
+ {
+ UPDATE_1_CHECK;
+ }
+ }
+ }
+ state = kNumStates;
+ prob = probs + RepLenCoder;
+ }
+ {
+ unsigned limit, offset;
+ CLzmaProb *probLen = prob + LenChoice;
+ IF_BIT_0_CHECK(probLen)
+ {
+ UPDATE_0_CHECK;
+ probLen = prob + LenLow + (posState << kLenNumLowBits);
+ offset = 0;
+ limit = 1 << kLenNumLowBits;
+ }
+ else
+ {
+ UPDATE_1_CHECK;
+ probLen = prob + LenChoice2;
+ IF_BIT_0_CHECK(probLen)
+ {
+ UPDATE_0_CHECK;
+ probLen = prob + LenMid + (posState << kLenNumMidBits);
+ offset = kLenNumLowSymbols;
+ limit = 1 << kLenNumMidBits;
+ }
+ else
+ {
+ UPDATE_1_CHECK;
+ probLen = prob + LenHigh;
+ offset = kLenNumLowSymbols + kLenNumMidSymbols;
+ limit = 1 << kLenNumHighBits;
+ }
+ }
+ TREE_DECODE_CHECK(probLen, limit, len);
+ len += offset;
+ }
+
+ if (state < 4)
+ {
+ unsigned posSlot;
+ prob = probs + PosSlot +
+ ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
+ kNumPosSlotBits);
+ TREE_DECODE_CHECK(prob, 1 << kNumPosSlotBits, posSlot);
+ if (posSlot >= kStartPosModelIndex)
+ {
+ int numDirectBits = ((posSlot >> 1) - 1);
+
+ /* if (bufLimit - buf >= 8) return DUMMY_MATCH; */
+
+ if (posSlot < kEndPosModelIndex)
+ {
+ prob = probs + SpecPos + ((2 | (posSlot & 1)) << numDirectBits) - posSlot - 1;
+ }
+ else
+ {
+ numDirectBits -= kNumAlignBits;
+ do
+ {
+ NORMALIZE_CHECK
+ range >>= 1;
+ code -= range & (((code - range) >> 31) - 1);
+ /* if (code >= range) code -= range; */
+ }
+ while (--numDirectBits != 0);
+ prob = probs + Align;
+ numDirectBits = kNumAlignBits;
+ }
+ {
+ unsigned i = 1;
+ do
+ {
+ GET_BIT_CHECK(prob + i, i);
+ }
+ while (--numDirectBits != 0);
+ }
+ }
+ }
+ }
+ }
+ NORMALIZE_CHECK;
+ return res;
+}
+
+
+static void LzmaDec_InitRc(CLzmaDec *p, const Byte *data)
+{
+ p->code = ((UInt32)data[1] << 24) | ((UInt32)data[2] << 16) | ((UInt32)data[3] << 8) | ((UInt32)data[4]);
+ p->range = 0xFFFFFFFF;
+ p->needFlush = 0;
+}
+
+void LzmaDec_InitDicAndState(CLzmaDec *p, Bool initDic, Bool initState)
+{
+ p->needFlush = 1;
+ p->remainLen = 0;
+ p->tempBufSize = 0;
+
+ if (initDic)
+ {
+ p->processedPos = 0;
+ p->checkDicSize = 0;
+ p->needInitState = 1;
+ }
+ if (initState)
+ p->needInitState = 1;
+}
+
+void LzmaDec_Init(CLzmaDec *p)
+{
+ p->dicPos = 0;
+ LzmaDec_InitDicAndState(p, True, True);
+}
+
+static void LzmaDec_InitStateReal(CLzmaDec *p)
+{
+ UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (p->prop.lc + p->prop.lp));
+ UInt32 i;
+ CLzmaProb *probs = p->probs;
+ for (i = 0; i < numProbs; i++)
+ probs[i] = kBitModelTotal >> 1;
+ p->reps[0] = p->reps[1] = p->reps[2] = p->reps[3] = 1;
+ p->state = 0;
+ p->needInitState = 0;
+}
+
+SRes LzmaDec_DecodeToDic(CLzmaDec *p, SizeT dicLimit, const Byte *src, SizeT *srcLen,
+ ELzmaFinishMode finishMode, ELzmaStatus *status)
+{
+ SizeT inSize = *srcLen;
+ (*srcLen) = 0;
+ LzmaDec_WriteRem(p, dicLimit);
+
+ *status = LZMA_STATUS_NOT_SPECIFIED;
+
+ while (p->remainLen != kMatchSpecLenStart)
+ {
+ int checkEndMarkNow;
+
+ if (p->needFlush != 0)
+ {
+ for (; inSize > 0 && p->tempBufSize < RC_INIT_SIZE; (*srcLen)++, inSize--)
+ p->tempBuf[p->tempBufSize++] = *src++;
+ if (p->tempBufSize < RC_INIT_SIZE)
+ {
+ *status = LZMA_STATUS_NEEDS_MORE_INPUT;
+ return SZ_OK;
+ }
+ if (p->tempBuf[0] != 0)
+ return SZ_ERROR_DATA;
+
+ LzmaDec_InitRc(p, p->tempBuf);
+ p->tempBufSize = 0;
+ }
+
+ checkEndMarkNow = 0;
+ if (p->dicPos >= dicLimit)
+ {
+ if (p->remainLen == 0 && p->code == 0)
+ {
+ *status = LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK;
+ return SZ_OK;
+ }
+ if (finishMode == LZMA_FINISH_ANY)
+ {
+ *status = LZMA_STATUS_NOT_FINISHED;
+ return SZ_OK;
+ }
+ if (p->remainLen != 0)
+ {
+ *status = LZMA_STATUS_NOT_FINISHED;
+ return SZ_ERROR_DATA;
+ }
+ checkEndMarkNow = 1;
+ }
+
+ if (p->needInitState)
+ LzmaDec_InitStateReal(p);
+
+ if (p->tempBufSize == 0)
+ {
+ SizeT processed;
+ const Byte *bufLimit;
+ if (inSize < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow)
+ {
+ int dummyRes = LzmaDec_TryDummy(p, src, inSize);
+ if (dummyRes == DUMMY_ERROR)
+ {
+ memcpy(p->tempBuf, src, inSize);
+ p->tempBufSize = (unsigned)inSize;
+ (*srcLen) += inSize;
+ *status = LZMA_STATUS_NEEDS_MORE_INPUT;
+ return SZ_OK;
+ }
+ if (checkEndMarkNow && dummyRes != DUMMY_MATCH)
+ {
+ *status = LZMA_STATUS_NOT_FINISHED;
+ return SZ_ERROR_DATA;
+ }
+ bufLimit = src;
+ }
+ else
+ bufLimit = src + inSize - LZMA_REQUIRED_INPUT_MAX;
+ p->buf = src;
+ if (LzmaDec_DecodeReal2(p, dicLimit, bufLimit) != 0)
+ return SZ_ERROR_DATA;
+ processed = (SizeT)(p->buf - src);
+ (*srcLen) += processed;
+ src += processed;
+ inSize -= processed;
+ }
+ else
+ {
+ unsigned rem = p->tempBufSize, lookAhead = 0;
+ while (rem < LZMA_REQUIRED_INPUT_MAX && lookAhead < inSize)
+ p->tempBuf[rem++] = src[lookAhead++];
+ p->tempBufSize = rem;
+ if (rem < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow)
+ {
+ int dummyRes = LzmaDec_TryDummy(p, p->tempBuf, rem);
+ if (dummyRes == DUMMY_ERROR)
+ {
+ (*srcLen) += lookAhead;
+ *status = LZMA_STATUS_NEEDS_MORE_INPUT;
+ return SZ_OK;
+ }
+ if (checkEndMarkNow && dummyRes != DUMMY_MATCH)
+ {
+ *status = LZMA_STATUS_NOT_FINISHED;
+ return SZ_ERROR_DATA;
+ }
+ }
+ p->buf = p->tempBuf;
+ if (LzmaDec_DecodeReal2(p, dicLimit, p->buf) != 0)
+ return SZ_ERROR_DATA;
+ lookAhead -= (rem - (unsigned)(p->buf - p->tempBuf));
+ (*srcLen) += lookAhead;
+ src += lookAhead;
+ inSize -= lookAhead;
+ p->tempBufSize = 0;
+ }
+ }
+ if (p->code == 0)
+ *status = LZMA_STATUS_FINISHED_WITH_MARK;
+ return (p->code == 0) ? SZ_OK : SZ_ERROR_DATA;
+}
+
+SRes LzmaDec_DecodeToBuf(CLzmaDec *p, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status)
+{
+ SizeT outSize = *destLen;
+ SizeT inSize = *srcLen;
+ *srcLen = *destLen = 0;
+ for (;;)
+ {
+ SizeT inSizeCur = inSize, outSizeCur, dicPos;
+ ELzmaFinishMode curFinishMode;
+ SRes res;
+ if (p->dicPos == p->dicBufSize)
+ p->dicPos = 0;
+ dicPos = p->dicPos;
+ if (outSize > p->dicBufSize - dicPos)
+ {
+ outSizeCur = p->dicBufSize;
+ curFinishMode = LZMA_FINISH_ANY;
+ }
+ else
+ {
+ outSizeCur = dicPos + outSize;
+ curFinishMode = finishMode;
+ }
+
+ res = LzmaDec_DecodeToDic(p, outSizeCur, src, &inSizeCur, curFinishMode, status);
+ src += inSizeCur;
+ inSize -= inSizeCur;
+ *srcLen += inSizeCur;
+ outSizeCur = p->dicPos - dicPos;
+ memcpy(dest, p->dic + dicPos, outSizeCur);
+ dest += outSizeCur;
+ outSize -= outSizeCur;
+ *destLen += outSizeCur;
+ if (res != 0)
+ return res;
+ if (outSizeCur == 0 || outSize == 0)
+ return SZ_OK;
+ }
+}
+
+void LzmaDec_FreeProbs(CLzmaDec *p, ISzAlloc *alloc)
+{
+ alloc->Free(alloc, p->probs);
+ p->probs = 0;
+}
+
+static void LzmaDec_FreeDict(CLzmaDec *p, ISzAlloc *alloc)
+{
+ alloc->Free(alloc, p->dic);
+ p->dic = 0;
+}
+
+void LzmaDec_Free(CLzmaDec *p, ISzAlloc *alloc)
+{
+ LzmaDec_FreeProbs(p, alloc);
+ LzmaDec_FreeDict(p, alloc);
+}
+
+SRes LzmaProps_Decode(CLzmaProps *p, const Byte *data, unsigned size)
+{
+ UInt32 dicSize;
+ Byte d;
+
+ if (size < LZMA_PROPS_SIZE)
+ return SZ_ERROR_UNSUPPORTED;
+ else
+ dicSize = data[1] | ((UInt32)data[2] << 8) | ((UInt32)data[3] << 16) | ((UInt32)data[4] << 24);
+
+ if (dicSize < LZMA_DIC_MIN)
+ dicSize = LZMA_DIC_MIN;
+ p->dicSize = dicSize;
+
+ d = data[0];
+ if (d >= (9 * 5 * 5))
+ return SZ_ERROR_UNSUPPORTED;
+
+ p->lc = d % 9;
+ d /= 9;
+ p->pb = d / 5;
+ p->lp = d % 5;
+
+ return SZ_OK;
+}
+
+static SRes LzmaDec_AllocateProbs2(CLzmaDec *p, const CLzmaProps *propNew, ISzAlloc *alloc)
+{
+ UInt32 numProbs = LzmaProps_GetNumProbs(propNew);
+ if (p->probs == 0 || numProbs != p->numProbs)
+ {
+ LzmaDec_FreeProbs(p, alloc);
+ p->probs = (CLzmaProb *)alloc->Alloc(alloc, numProbs * sizeof(CLzmaProb));
+ p->numProbs = numProbs;
+ if (p->probs == 0)
+ return SZ_ERROR_MEM;
+ }
+ return SZ_OK;
+}
+
+SRes LzmaDec_Allocate(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAlloc *alloc)
+{
+ CLzmaProps propNew;
+ SizeT dicBufSize;
+ RINOK(LzmaProps_Decode(&propNew, props, propsSize));
+ RINOK(LzmaDec_AllocateProbs2(p, &propNew, alloc));
+ dicBufSize = propNew.dicSize;
+ if (p->dic == 0 || dicBufSize != p->dicBufSize)
+ {
+ LzmaDec_FreeDict(p, alloc);
+ p->dic = (Byte *)alloc->Alloc(alloc, dicBufSize);
+ if (p->dic == 0)
+ {
+ LzmaDec_FreeProbs(p, alloc);
+ return SZ_ERROR_MEM;
+ }
+ }
+ p->dicBufSize = dicBufSize;
+ p->prop = propNew;
+ return SZ_OK;
+}
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