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/* LzmaDec.c -- LZMA Decoder

2015-06-23 : Igor Pavlov : Public domain */

#include "Precomp.h"

#include "LzmaDec.h"

#include 

#include 

#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 NORMAL_LITER_DEC GET_BIT(prob + symbol, symbol)

#define MATCHED_LITER_DEC \

  matchByte <<= 1; \

  bit = (matchByte & offs); \

  probLit = prob + offs + bit + symbol; \

  GET_BIT2(probLit, symbol, offs &= ~bit, offs &= bit)

#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 0x300

#if Literal != LZMA_BASE_SIZE

StopCompilingDueBUG

#endif

#define LzmaProps_GetNumProbs(p) (Literal + ((UInt32)LZMA_LIT_SIZE << ((p)->lc + (p)->lp)))

#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 (unused now)

    = kMatchSpecLenStart + 2 : State Init Marker (unused now)

*/

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 (processedPos != 0 || checkDicSize != 0)

        prob += ((UInt32)LZMA_LIT_SIZE * (((processedPos & lpMask) << lc) +

        (dic[(dicPos == 0 ? dicBufSize : dicPos) - 1] >> (8 - lc))));

      processedPos++;

      if (state < kNumLitStates)

      {

        state -= (state < 4) ? state : 3;

        symbol = 1;

        #ifdef _LZMA_SIZE_OPT

        do { NORMAL_LITER_DEC } while (symbol < 0x100);

        #else

        NORMAL_LITER_DEC

        NORMAL_LITER_DEC

        NORMAL_LITER_DEC

        NORMAL_LITER_DEC

        NORMAL_LITER_DEC

        NORMAL_LITER_DEC

        NORMAL_LITER_DEC

        NORMAL_LITER_DEC

        #endif

      }

      else

      {

        unsigned matchByte = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];

        unsigned offs = 0x100;

        state -= (state < 10) ? 3 : 6;

        symbol = 1;

        #ifdef _LZMA_SIZE_OPT

        do

        {

          unsigned bit;

          CLzmaProb *probLit;

          MATCHED_LITER_DEC

        }

        while (symbol < 0x100);

        #else

        {

          unsigned bit;

          CLzmaProb *probLit;

          MATCHED_LITER_DEC

          MATCHED_LITER_DEC

          MATCHED_LITER_DEC

          MATCHED_LITER_DEC

          MATCHED_LITER_DEC

          MATCHED_LITER_DEC

          MATCHED_LITER_DEC

          MATCHED_LITER_DEC

        }

        #endif

      }

      dic[dicPos++] = (Byte)symbol;

      continue;

    }

    {

      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;

      }

      #ifdef _LZMA_SIZE_OPT

      {

        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;

      }

      #else

      {

        CLzmaProb *probLen = prob + LenChoice;

        IF_BIT_0(probLen)

        {

          UPDATE_0(probLen);

          probLen = prob + LenLow + (posState << kLenNumLowBits);

          len = 1;

          TREE_GET_BIT(probLen, len);

          TREE_GET_BIT(probLen, len);

          TREE_GET_BIT(probLen, len);

          len -= 8;

        }

        else

        {

          UPDATE_1(probLen);

          probLen = prob + LenChoice2;

          IF_BIT_0(probLen)

          {

            UPDATE_0(probLen);

            probLen = prob + LenMid + (posState << kLenNumMidBits);

            len = 1;

            TREE_GET_BIT(probLen, len);

            TREE_GET_BIT(probLen, len);

            TREE_GET_BIT(probLen, len);

          }

          else

          {

            UPDATE_1(probLen);

            probLen = prob + LenHigh;

            TREE_DECODE(probLen, (1 << kLenNumHighBits), len);

            len += kLenNumLowSymbols + kLenNumMidSymbols;

          }

        }

      }

      #endif

      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;

          unsigned numDirectBits = (unsigned)(((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)

          {

            printf("%s fail line %d distance %d processedPos %d\n",

                   __FUNCTION__,__LINE__,distance,processedPos );

            return SZ_ERROR_DATA;

          }

        }

        else if (distance >= checkDicSize)

        {

          printf("%s fail line %d\n", __FUNCTION__,__LINE__);

          return SZ_ERROR_DATA;

        }

        state = (state < kNumStates + kNumLitStates) ? kNumLitStates : kNumLitStates + 3;

      }

      len += kMatchMinLen;

      {

        SizeT rem;

        unsigned curLen;

        SizeT pos;

        if ((rem = limit - dicPos) == 0)

        {

          p->dicPos = dicPos;

        return SZ_ERROR_DATA;

        }

        curLen = ((rem < len) ? (unsigned)rem : len);

        pos = dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0);

        processedPos += curLen;

        len -= curLen;

        if (curLen <= dicBufSize - pos)

        {

          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;

    SizeT rep0 = p->reps[0]; /* we use SizeT to avoid the BUG of VC14 for AMD64 */

    SizeT rem = limit - dicPos;

    if (rem < len)

      len = (unsigned)(rem);

    if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= len)

      p->checkDicSize = p->prop.dicSize;

    p->processedPos += len;

    p->remainLen -= len;

    while (len != 0)

    {

      len--;

      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->checkDicSize == 0 && 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;

  const CLzmaProb *probs = p->probs;

  unsigned state = p->state;

  ELzmaDummy res;

  {

    const 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 += ((UInt32)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;

          const 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;

        const 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)

        {

          unsigned 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;

}

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)

{

  SizeT numProbs = LzmaProps_GetNumProbs(&p->prop);

  SizeT 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)

      {

        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;

        p->code =

              ((UInt32)p->tempBuf[1] << 24)

            | ((UInt32)p->tempBuf[2] << 16)

            | ((UInt32)p->tempBuf[3] << 8)

            | ((UInt32)p->tempBuf[4]);

        p->range = 0xFFFFFFFF;

        p->needFlush = 0;

        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;

        {

          unsigned kkk = (unsigned)(p->buf - p->tempBuf);

          if (rem < kkk)

            return SZ_ERROR_FAIL; /* some internal error */

          rem -= kkk;

          if (lookAhead < rem)

            return SZ_ERROR_FAIL; /* some internal error */

          lookAhead -= rem;

        }

        (*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 = NULL;

}

static void LzmaDec_FreeDict(CLzmaDec *p, ISzAlloc *alloc)

{

  alloc->Free(alloc, p->dic);

  p->dic = NULL;

}

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 || numProbs != p->numProbs)

  {

    LzmaDec_FreeProbs(p, alloc);

    p->probs = (CLzmaProb *)alloc->Alloc(alloc, numProbs * sizeof(CLzmaProb));

    p->numProbs = numProbs;

    if (!p->probs)

      return SZ_ERROR_MEM;

  }

  return SZ_OK;

}

SRes LzmaDec_AllocateProbs(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAlloc *alloc)

{

  CLzmaProps propNew;

  RINOK(LzmaProps_Decode(&propNew, props, propsSize));

  RINOK(LzmaDec_AllocateProbs2(p, &propNew, alloc));

  p->prop = propNew;

  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));

  {

    UInt32 dictSize = propNew.dicSize;

    SizeT mask = ((UInt32)1 << 12) - 1;

         if (dictSize >= ((UInt32)1 << 30)) mask = ((UInt32)1 << 22) - 1;

    else if (dictSize >= ((UInt32)1 << 22)) mask = ((UInt32)1 << 20) - 1;;

    dicBufSize = ((SizeT)dictSize + mask) & ~mask;

    if (dicBufSize < dictSize)

      dicBufSize = dictSize;

  }

  if (!p->dic || dicBufSize != p->dicBufSize)

  {

    LzmaDec_FreeDict(p, alloc);

    p->dic = (Byte *)alloc->Alloc(alloc, dicBufSize);

    if (!p->dic)

    {

      LzmaDec_FreeProbs(p, alloc);

      return SZ_ERROR_MEM;

    }

  }

  p->dicBufSize = dicBufSize;

  p->prop = propNew;

  return SZ_OK;

}

SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,

    const Byte *propData, unsigned propSize, ELzmaFinishMode finishMode,

    ELzmaStatus *status, ISzAlloc *alloc)

{

  CLzmaDec p;

  SRes res;

  SizeT outSize = *destLen, inSize = *srcLen;

  *destLen = *srcLen = 0;

  *status = LZMA_STATUS_NOT_SPECIFIED;

  if (inSize < RC_INIT_SIZE)

    return SZ_ERROR_INPUT_EOF;

  LzmaDec_Construct(&p);

  RINOK(LzmaDec_AllocateProbs(&p, propData, propSize, alloc));

  p.dic = dest;

  p.dicBufSize = outSize;

  LzmaDec_Init(&p);

  *srcLen = inSize;

  res = LzmaDec_DecodeToDic(&p, outSize, src, srcLen, finishMode, status);

  *destLen = p.dicPos;

  if (res == SZ_OK && *status == LZMA_STATUS_NEEDS_MORE_INPUT)

    res = SZ_ERROR_INPUT_EOF;

  LzmaDec_FreeProbs(&p, alloc);

  return res;

}