[mirror_edk2.git] / BaseTools / Source / C / LzmaCompress / Sdk / C / LzmaDec.c

/* LzmaDec.c -- LZMA Decoder\r
2018-02-28 : Igor Pavlov : Public domain */\r
\r
#include "Precomp.h"\r
\r
/* #include "CpuArch.h" */\r
#include "LzmaDec.h"\r
\r
#include <string.h>\r
\r
#define kNumTopBits 24\r
#define kTopValue ((UInt32)1 << kNumTopBits)\r
\r
#define kNumBitModelTotalBits 11\r
#define kBitModelTotal (1 << kNumBitModelTotalBits)\r
#define kNumMoveBits 5\r
\r
#define RC_INIT_SIZE 5\r
\r
#define NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | (*buf++); }\r
\r
#define IF_BIT_0(p) ttt = *(p); NORMALIZE; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)\r
#define UPDATE_0(p) range = bound; *(p) = (CLzmaProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));\r
#define UPDATE_1(p) range -= bound; code -= bound; *(p) = (CLzmaProb)(ttt - (ttt >> kNumMoveBits));\r
#define GET_BIT2(p, i, A0, A1) IF_BIT_0(p) \\r
  { UPDATE_0(p); i = (i + i); A0; } else \\r
  { UPDATE_1(p); i = (i + i) + 1; A1; }\r
\r
#define TREE_GET_BIT(probs, i) { GET_BIT2(probs + i, i, ;, ;); }\r
\r
#define REV_BIT(p, i, A0, A1) IF_BIT_0(p + i) \\r
  { UPDATE_0(p + i); A0; } else \\r
  { UPDATE_1(p + i); A1; }\r
#define REV_BIT_VAR(  p, i, m) REV_BIT(p, i, i += m; m += m, m += m; i += m; )\r
#define REV_BIT_CONST(p, i, m) REV_BIT(p, i, i += m;       , i += m * 2; )\r
#define REV_BIT_LAST( p, i, m) REV_BIT(p, i, i -= m        , ; )\r
\r
#define TREE_DECODE(probs, limit, i) \\r
  { i = 1; do { TREE_GET_BIT(probs, i); } while (i < limit); i -= limit; }\r
\r
/* #define _LZMA_SIZE_OPT */\r
\r
#ifdef _LZMA_SIZE_OPT\r
#define TREE_6_DECODE(probs, i) TREE_DECODE(probs, (1 << 6), i)\r
#else\r
#define TREE_6_DECODE(probs, i) \\r
  { i = 1; \\r
  TREE_GET_BIT(probs, i); \\r
  TREE_GET_BIT(probs, i); \\r
  TREE_GET_BIT(probs, i); \\r
  TREE_GET_BIT(probs, i); \\r
  TREE_GET_BIT(probs, i); \\r
  TREE_GET_BIT(probs, i); \\r
  i -= 0x40; }\r
#endif\r
\r
#define NORMAL_LITER_DEC TREE_GET_BIT(prob, symbol)\r
#define MATCHED_LITER_DEC \\r
  matchByte += matchByte; \\r
  bit = offs; \\r
  offs &= matchByte; \\r
  probLit = prob + (offs + bit + symbol); \\r
  GET_BIT2(probLit, symbol, offs ^= bit; , ;)\r
\r
\r
\r
#define NORMALIZE_CHECK if (range < kTopValue) { if (buf >= bufLimit) return DUMMY_ERROR; range <<= 8; code = (code << 8) | (*buf++); }\r
\r
#define IF_BIT_0_CHECK(p) ttt = *(p); NORMALIZE_CHECK; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)\r
#define UPDATE_0_CHECK range = bound;\r
#define UPDATE_1_CHECK range -= bound; code -= bound;\r
#define GET_BIT2_CHECK(p, i, A0, A1) IF_BIT_0_CHECK(p) \\r
  { UPDATE_0_CHECK; i = (i + i); A0; } else \\r
  { UPDATE_1_CHECK; i = (i + i) + 1; A1; }\r
#define GET_BIT_CHECK(p, i) GET_BIT2_CHECK(p, i, ; , ;)\r
#define TREE_DECODE_CHECK(probs, limit, i) \\r
  { i = 1; do { GET_BIT_CHECK(probs + i, i) } while (i < limit); i -= limit; }\r
\r
\r
#define REV_BIT_CHECK(p, i, m) IF_BIT_0_CHECK(p + i) \\r
  { UPDATE_0_CHECK; i += m; m += m; } else \\r
  { UPDATE_1_CHECK; m += m; i += m; }\r
\r
\r
#define kNumPosBitsMax 4\r
#define kNumPosStatesMax (1 << kNumPosBitsMax)\r
\r
#define kLenNumLowBits 3\r
#define kLenNumLowSymbols (1 << kLenNumLowBits)\r
#define kLenNumHighBits 8\r
#define kLenNumHighSymbols (1 << kLenNumHighBits)\r
\r
#define LenLow 0\r
#define LenHigh (LenLow + 2 * (kNumPosStatesMax << kLenNumLowBits))\r
#define kNumLenProbs (LenHigh + kLenNumHighSymbols)\r
\r
#define LenChoice LenLow\r
#define LenChoice2 (LenLow + (1 << kLenNumLowBits))\r
\r
#define kNumStates 12\r
#define kNumStates2 16\r
#define kNumLitStates 7\r
\r
#define kStartPosModelIndex 4\r
#define kEndPosModelIndex 14\r
#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))\r
\r
#define kNumPosSlotBits 6\r
#define kNumLenToPosStates 4\r
\r
#define kNumAlignBits 4\r
#define kAlignTableSize (1 << kNumAlignBits)\r
\r
#define kMatchMinLen 2\r
#define kMatchSpecLenStart (kMatchMinLen + kLenNumLowSymbols * 2 + kLenNumHighSymbols)\r
\r
/* External ASM code needs same CLzmaProb array layout. So don't change it. */\r
\r
/* (probs_1664) is faster and better for code size at some platforms */\r
/*\r
#ifdef MY_CPU_X86_OR_AMD64\r
*/\r
#define kStartOffset 1664\r
#define GET_PROBS p->probs_1664\r
/*\r
#define GET_PROBS p->probs + kStartOffset\r
#else\r
#define kStartOffset 0\r
#define GET_PROBS p->probs\r
#endif\r
*/\r
\r
#define SpecPos (-kStartOffset)\r
#define IsRep0Long (SpecPos + kNumFullDistances)\r
#define RepLenCoder (IsRep0Long + (kNumStates2 << kNumPosBitsMax))\r
#define LenCoder (RepLenCoder + kNumLenProbs)\r
#define IsMatch (LenCoder + kNumLenProbs)\r
#define Align (IsMatch + (kNumStates2 << kNumPosBitsMax))\r
#define IsRep (Align + kAlignTableSize)\r
#define IsRepG0 (IsRep + kNumStates)\r
#define IsRepG1 (IsRepG0 + kNumStates)\r
#define IsRepG2 (IsRepG1 + kNumStates)\r
#define PosSlot (IsRepG2 + kNumStates)\r
#define Literal (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))\r
#define NUM_BASE_PROBS (Literal + kStartOffset)\r
\r
#if Align != 0 && kStartOffset != 0\r
  #error Stop_Compiling_Bad_LZMA_kAlign\r
#endif\r
\r
#if NUM_BASE_PROBS != 1984\r
  #error Stop_Compiling_Bad_LZMA_PROBS\r
#endif\r
\r
\r
#define LZMA_LIT_SIZE 0x300\r
\r
#define LzmaProps_GetNumProbs(p) (NUM_BASE_PROBS + ((UInt32)LZMA_LIT_SIZE << ((p)->lc + (p)->lp)))\r
\r
\r
#define CALC_POS_STATE(processedPos, pbMask) (((processedPos) & (pbMask)) << 4)\r
#define COMBINED_PS_STATE (posState + state)\r
#define GET_LEN_STATE (posState)\r
\r
#define LZMA_DIC_MIN (1 << 12)\r
\r
/*\r
p->remainLen : shows status of LZMA decoder:\r
    < kMatchSpecLenStart : normal remain\r
    = kMatchSpecLenStart : finished\r
    = kMatchSpecLenStart + 1 : need init range coder\r
    = kMatchSpecLenStart + 2 : need init range coder and state\r
*/\r
\r
/* ---------- LZMA_DECODE_REAL ---------- */\r
/*\r
LzmaDec_DecodeReal_3() can be implemented in external ASM file.\r
3 - is the code compatibility version of that function for check at link time.\r
*/\r
\r
#define LZMA_DECODE_REAL LzmaDec_DecodeReal_3\r
\r
/*\r
LZMA_DECODE_REAL()\r
In:\r
  RangeCoder is normalized\r
  if (p->dicPos == limit)\r
  {\r
    LzmaDec_TryDummy() was called before to exclude LITERAL and MATCH-REP cases.\r
    So first symbol can be only MATCH-NON-REP. And if that MATCH-NON-REP symbol\r
    is not END_OF_PAYALOAD_MARKER, then function returns error code.\r
  }\r
\r
Processing:\r
  first LZMA symbol will be decoded in any case\r
  All checks for limits are at the end of main loop,\r
  It will decode new LZMA-symbols while (p->buf < bufLimit && dicPos < limit),\r
  RangeCoder is still without last normalization when (p->buf < bufLimit) is being checked.\r
\r
Out:\r
  RangeCoder is normalized\r
  Result:\r
    SZ_OK - OK\r
    SZ_ERROR_DATA - Error\r
  p->remainLen:\r
    < kMatchSpecLenStart : normal remain\r
    = kMatchSpecLenStart : finished\r
*/\r
\r
\r
#ifdef _LZMA_DEC_OPT\r
\r
int MY_FAST_CALL LZMA_DECODE_REAL(CLzmaDec *p, SizeT limit, const Byte *bufLimit);\r
\r
#else\r
\r
static\r
int MY_FAST_CALL LZMA_DECODE_REAL(CLzmaDec *p, SizeT limit, const Byte *bufLimit)\r
{\r
  CLzmaProb *probs = GET_PROBS;\r
  unsigned state = (unsigned)p->state;\r
  UInt32 rep0 = p->reps[0], rep1 = p->reps[1], rep2 = p->reps[2], rep3 = p->reps[3];\r
  unsigned pbMask = ((unsigned)1 << (p->prop.pb)) - 1;\r
  unsigned lc = p->prop.lc;\r
  unsigned lpMask = ((unsigned)0x100 << p->prop.lp) - ((unsigned)0x100 >> lc);\r
\r
  Byte *dic = p->dic;\r
  SizeT dicBufSize = p->dicBufSize;\r
  SizeT dicPos = p->dicPos;\r
  \r
  UInt32 processedPos = p->processedPos;\r
  UInt32 checkDicSize = p->checkDicSize;\r
  unsigned len = 0;\r
\r
  const Byte *buf = p->buf;\r
  UInt32 range = p->range;\r
  UInt32 code = p->code;\r
\r
  do\r
  {\r
    CLzmaProb *prob;\r
    UInt32 bound;\r
    unsigned ttt;\r
    unsigned posState = CALC_POS_STATE(processedPos, pbMask);\r
\r
    prob = probs + IsMatch + COMBINED_PS_STATE;\r
    IF_BIT_0(prob)\r
    {\r
      unsigned symbol;\r
      UPDATE_0(prob);\r
      prob = probs + Literal;\r
      if (processedPos != 0 || checkDicSize != 0)\r
        prob += (UInt32)3 * ((((processedPos << 8) + dic[(dicPos == 0 ? dicBufSize : dicPos) - 1]) & lpMask) << lc);\r
      processedPos++;\r
\r
      if (state < kNumLitStates)\r
      {\r
        state -= (state < 4) ? state : 3;\r
        symbol = 1;\r
        #ifdef _LZMA_SIZE_OPT\r
        do { NORMAL_LITER_DEC } while (symbol < 0x100);\r
        #else\r
        NORMAL_LITER_DEC\r
        NORMAL_LITER_DEC\r
        NORMAL_LITER_DEC\r
        NORMAL_LITER_DEC\r
        NORMAL_LITER_DEC\r
        NORMAL_LITER_DEC\r
        NORMAL_LITER_DEC\r
        NORMAL_LITER_DEC\r
        #endif\r
      }\r
      else\r
      {\r
        unsigned matchByte = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];\r
        unsigned offs = 0x100;\r
        state -= (state < 10) ? 3 : 6;\r
        symbol = 1;\r
        #ifdef _LZMA_SIZE_OPT\r
        do\r
        {\r
          unsigned bit;\r
          CLzmaProb *probLit;\r
          MATCHED_LITER_DEC\r
        }\r
        while (symbol < 0x100);\r
        #else\r
        {\r
          unsigned bit;\r
          CLzmaProb *probLit;\r
          MATCHED_LITER_DEC\r
          MATCHED_LITER_DEC\r
          MATCHED_LITER_DEC\r
          MATCHED_LITER_DEC\r
          MATCHED_LITER_DEC\r
          MATCHED_LITER_DEC\r
          MATCHED_LITER_DEC\r
          MATCHED_LITER_DEC\r
        }\r
        #endif\r
      }\r
\r
      dic[dicPos++] = (Byte)symbol;\r
      continue;\r
    }\r
    \r
    {\r
      UPDATE_1(prob);\r
      prob = probs + IsRep + state;\r
      IF_BIT_0(prob)\r
      {\r
        UPDATE_0(prob);\r
        state += kNumStates;\r
        prob = probs + LenCoder;\r
      }\r
      else\r
      {\r
        UPDATE_1(prob);\r
        /*\r
        // that case was checked before with kBadRepCode\r
        if (checkDicSize == 0 && processedPos == 0)\r
          return SZ_ERROR_DATA;\r
        */\r
        prob = probs + IsRepG0 + state;\r
        IF_BIT_0(prob)\r
        {\r
          UPDATE_0(prob);\r
          prob = probs + IsRep0Long + COMBINED_PS_STATE;\r
          IF_BIT_0(prob)\r
          {\r
            UPDATE_0(prob);\r
            dic[dicPos] = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];\r
            dicPos++;\r
            processedPos++;\r
            state = state < kNumLitStates ? 9 : 11;\r
            continue;\r
          }\r
          UPDATE_1(prob);\r
        }\r
        else\r
        {\r
          UInt32 distance;\r
          UPDATE_1(prob);\r
          prob = probs + IsRepG1 + state;\r
          IF_BIT_0(prob)\r
          {\r
            UPDATE_0(prob);\r
            distance = rep1;\r
          }\r
          else\r
          {\r
            UPDATE_1(prob);\r
            prob = probs + IsRepG2 + state;\r
            IF_BIT_0(prob)\r
            {\r
              UPDATE_0(prob);\r
              distance = rep2;\r
            }\r
            else\r
            {\r
              UPDATE_1(prob);\r
              distance = rep3;\r
              rep3 = rep2;\r
            }\r
            rep2 = rep1;\r
          }\r
          rep1 = rep0;\r
          rep0 = distance;\r
        }\r
        state = state < kNumLitStates ? 8 : 11;\r
        prob = probs + RepLenCoder;\r
      }\r
      \r
      #ifdef _LZMA_SIZE_OPT\r
      {\r
        unsigned lim, offset;\r
        CLzmaProb *probLen = prob + LenChoice;\r
        IF_BIT_0(probLen)\r
        {\r
          UPDATE_0(probLen);\r
          probLen = prob + LenLow + GET_LEN_STATE;\r
          offset = 0;\r
          lim = (1 << kLenNumLowBits);\r
        }\r
        else\r
        {\r
          UPDATE_1(probLen);\r
          probLen = prob + LenChoice2;\r
          IF_BIT_0(probLen)\r
          {\r
            UPDATE_0(probLen);\r
            probLen = prob + LenLow + GET_LEN_STATE + (1 << kLenNumLowBits);\r
            offset = kLenNumLowSymbols;\r
            lim = (1 << kLenNumLowBits);\r
          }\r
          else\r
          {\r
            UPDATE_1(probLen);\r
            probLen = prob + LenHigh;\r
            offset = kLenNumLowSymbols * 2;\r
            lim = (1 << kLenNumHighBits);\r
          }\r
        }\r
        TREE_DECODE(probLen, lim, len);\r
        len += offset;\r
      }\r
      #else\r
      {\r
        CLzmaProb *probLen = prob + LenChoice;\r
        IF_BIT_0(probLen)\r
        {\r
          UPDATE_0(probLen);\r
          probLen = prob + LenLow + GET_LEN_STATE;\r
          len = 1;\r
          TREE_GET_BIT(probLen, len);\r
          TREE_GET_BIT(probLen, len);\r
          TREE_GET_BIT(probLen, len);\r
          len -= 8;\r
        }\r
        else\r
        {\r
          UPDATE_1(probLen);\r
          probLen = prob + LenChoice2;\r
          IF_BIT_0(probLen)\r
          {\r
            UPDATE_0(probLen);\r
            probLen = prob + LenLow + GET_LEN_STATE + (1 << kLenNumLowBits);\r
            len = 1;\r
            TREE_GET_BIT(probLen, len);\r
            TREE_GET_BIT(probLen, len);\r
            TREE_GET_BIT(probLen, len);\r
          }\r
          else\r
          {\r
            UPDATE_1(probLen);\r
            probLen = prob + LenHigh;\r
            TREE_DECODE(probLen, (1 << kLenNumHighBits), len);\r
            len += kLenNumLowSymbols * 2;\r
          }\r
        }\r
      }\r
      #endif\r
\r
      if (state >= kNumStates)\r
      {\r
        UInt32 distance;\r
        prob = probs + PosSlot +\r
            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << kNumPosSlotBits);\r
        TREE_6_DECODE(prob, distance);\r
        if (distance >= kStartPosModelIndex)\r
        {\r
          unsigned posSlot = (unsigned)distance;\r
          unsigned numDirectBits = (unsigned)(((distance >> 1) - 1));\r
          distance = (2 | (distance & 1));\r
          if (posSlot < kEndPosModelIndex)\r
          {\r
            distance <<= numDirectBits;\r
            prob = probs + SpecPos;\r
            {\r
              UInt32 m = 1;\r
              distance++;\r
              do\r
              {\r
                REV_BIT_VAR(prob, distance, m);\r
              }\r
              while (--numDirectBits);\r
              distance -= m;\r
            }\r
          }\r
          else\r
          {\r
            numDirectBits -= kNumAlignBits;\r
            do\r
            {\r
              NORMALIZE\r
              range >>= 1;\r
              \r
              {\r
                UInt32 t;\r
                code -= range;\r
                t = (0 - ((UInt32)code >> 31)); /* (UInt32)((Int32)code >> 31) */\r
                distance = (distance << 1) + (t + 1);\r
                code += range & t;\r
              }\r
              /*\r
              distance <<= 1;\r
              if (code >= range)\r
              {\r
                code -= range;\r
                distance |= 1;\r
              }\r
              */\r
            }\r
            while (--numDirectBits);\r
            prob = probs + Align;\r
            distance <<= kNumAlignBits;\r
            {\r
              unsigned i = 1;\r
              REV_BIT_CONST(prob, i, 1);\r
              REV_BIT_CONST(prob, i, 2);\r
              REV_BIT_CONST(prob, i, 4);\r
              REV_BIT_LAST (prob, i, 8);\r
              distance |= i;\r
            }\r
            if (distance == (UInt32)0xFFFFFFFF)\r
            {\r
              len = kMatchSpecLenStart;\r
              state -= kNumStates;\r
              break;\r
            }\r
          }\r
        }\r
        \r
        rep3 = rep2;\r
        rep2 = rep1;\r
        rep1 = rep0;\r
        rep0 = distance + 1;\r
        state = (state < kNumStates + kNumLitStates) ? kNumLitStates : kNumLitStates + 3;\r
        if (distance >= (checkDicSize == 0 ? processedPos: checkDicSize))\r
        {\r
          p->dicPos = dicPos;\r
          return SZ_ERROR_DATA;\r
        }\r
      }\r
\r
      len += kMatchMinLen;\r
\r
      {\r
        SizeT rem;\r
        unsigned curLen;\r
        SizeT pos;\r
        \r
        if ((rem = limit - dicPos) == 0)\r
        {\r
          p->dicPos = dicPos;\r
          return SZ_ERROR_DATA;\r
        }\r
        \r
        curLen = ((rem < len) ? (unsigned)rem : len);\r
        pos = dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0);\r
\r
        processedPos += curLen;\r
\r
        len -= curLen;\r
        if (curLen <= dicBufSize - pos)\r
        {\r
          Byte *dest = dic + dicPos;\r
          ptrdiff_t src = (ptrdiff_t)pos - (ptrdiff_t)dicPos;\r
          const Byte *lim = dest + curLen;\r
          dicPos += curLen;\r
          do\r
            *(dest) = (Byte)*(dest + src);\r
          while (++dest != lim);\r
        }\r
        else\r
        {\r
          do\r
          {\r
            dic[dicPos++] = dic[pos];\r
            if (++pos == dicBufSize)\r
              pos = 0;\r
          }\r
          while (--curLen != 0);\r
        }\r
      }\r
    }\r
  }\r
  while (dicPos < limit && buf < bufLimit);\r
\r
  NORMALIZE;\r
  \r
  p->buf = buf;\r
  p->range = range;\r
  p->code = code;\r
  p->remainLen = len;\r
  p->dicPos = dicPos;\r
  p->processedPos = processedPos;\r
  p->reps[0] = rep0;\r
  p->reps[1] = rep1;\r
  p->reps[2] = rep2;\r
  p->reps[3] = rep3;\r
  p->state = state;\r
\r
  return SZ_OK;\r
}\r
#endif\r
\r
static void MY_FAST_CALL LzmaDec_WriteRem(CLzmaDec *p, SizeT limit)\r
{\r
  if (p->remainLen != 0 && p->remainLen < kMatchSpecLenStart)\r
  {\r
    Byte *dic = p->dic;\r
    SizeT dicPos = p->dicPos;\r
    SizeT dicBufSize = p->dicBufSize;\r
    unsigned len = (unsigned)p->remainLen;\r
    SizeT rep0 = p->reps[0]; /* we use SizeT to avoid the BUG of VC14 for AMD64 */\r
    SizeT rem = limit - dicPos;\r
    if (rem < len)\r
      len = (unsigned)(rem);\r
\r
    if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= len)\r
      p->checkDicSize = p->prop.dicSize;\r
\r
    p->processedPos += len;\r
    p->remainLen -= len;\r
    while (len != 0)\r
    {\r
      len--;\r
      dic[dicPos] = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];\r
      dicPos++;\r
    }\r
    p->dicPos = dicPos;\r
  }\r
}\r
\r
\r
#define kRange0 0xFFFFFFFF\r
#define kBound0 ((kRange0 >> kNumBitModelTotalBits) << (kNumBitModelTotalBits - 1))\r
#define kBadRepCode (kBound0 + (((kRange0 - kBound0) >> kNumBitModelTotalBits) << (kNumBitModelTotalBits - 1)))\r
#if kBadRepCode != (0xC0000000 - 0x400)\r
  #error Stop_Compiling_Bad_LZMA_Check\r
#endif\r
\r
static int MY_FAST_CALL LzmaDec_DecodeReal2(CLzmaDec *p, SizeT limit, const Byte *bufLimit)\r
{\r
  do\r
  {\r
    SizeT limit2 = limit;\r
    if (p->checkDicSize == 0)\r
    {\r
      UInt32 rem = p->prop.dicSize - p->processedPos;\r
      if (limit - p->dicPos > rem)\r
        limit2 = p->dicPos + rem;\r
\r
      if (p->processedPos == 0)\r
        if (p->code >= kBadRepCode)\r
          return SZ_ERROR_DATA;\r
    }\r
\r
    RINOK(LZMA_DECODE_REAL(p, limit2, bufLimit));\r
    \r
    if (p->checkDicSize == 0 && p->processedPos >= p->prop.dicSize)\r
      p->checkDicSize = p->prop.dicSize;\r
    \r
    LzmaDec_WriteRem(p, limit);\r
  }\r
  while (p->dicPos < limit && p->buf < bufLimit && p->remainLen < kMatchSpecLenStart);\r
\r
  return 0;\r
}\r
\r
typedef enum\r
{\r
  DUMMY_ERROR, /* unexpected end of input stream */\r
  DUMMY_LIT,\r
  DUMMY_MATCH,\r
  DUMMY_REP\r
} ELzmaDummy;\r
\r
static ELzmaDummy LzmaDec_TryDummy(const CLzmaDec *p, const Byte *buf, SizeT inSize)\r
{\r
  UInt32 range = p->range;\r
  UInt32 code = p->code;\r
  const Byte *bufLimit = buf + inSize;\r
  const CLzmaProb *probs = GET_PROBS;\r
  unsigned state = (unsigned)p->state;\r
  ELzmaDummy res;\r
\r
  {\r
    const CLzmaProb *prob;\r
    UInt32 bound;\r
    unsigned ttt;\r
    unsigned posState = CALC_POS_STATE(p->processedPos, (1 << p->prop.pb) - 1);\r
\r
    prob = probs + IsMatch + COMBINED_PS_STATE;\r
    IF_BIT_0_CHECK(prob)\r
    {\r
      UPDATE_0_CHECK\r
\r
      /* if (bufLimit - buf >= 7) return DUMMY_LIT; */\r
\r
      prob = probs + Literal;\r
      if (p->checkDicSize != 0 || p->processedPos != 0)\r
        prob += ((UInt32)LZMA_LIT_SIZE *\r
            ((((p->processedPos) & ((1 << (p->prop.lp)) - 1)) << p->prop.lc) +\r
            (p->dic[(p->dicPos == 0 ? p->dicBufSize : p->dicPos) - 1] >> (8 - p->prop.lc))));\r
\r
      if (state < kNumLitStates)\r
      {\r
        unsigned symbol = 1;\r
        do { GET_BIT_CHECK(prob + symbol, symbol) } while (symbol < 0x100);\r
      }\r
      else\r
      {\r
        unsigned matchByte = p->dic[p->dicPos - p->reps[0] +\r
            (p->dicPos < p->reps[0] ? p->dicBufSize : 0)];\r
        unsigned offs = 0x100;\r
        unsigned symbol = 1;\r
        do\r
        {\r
          unsigned bit;\r
          const CLzmaProb *probLit;\r
          matchByte += matchByte;\r
          bit = offs;\r
          offs &= matchByte;\r
          probLit = prob + (offs + bit + symbol);\r
          GET_BIT2_CHECK(probLit, symbol, offs ^= bit; , ; )\r
        }\r
        while (symbol < 0x100);\r
      }\r
      res = DUMMY_LIT;\r
    }\r
    else\r
    {\r
      unsigned len;\r
      UPDATE_1_CHECK;\r
\r
      prob = probs + IsRep + state;\r
      IF_BIT_0_CHECK(prob)\r
      {\r
        UPDATE_0_CHECK;\r
        state = 0;\r
        prob = probs + LenCoder;\r
        res = DUMMY_MATCH;\r
      }\r
      else\r
      {\r
        UPDATE_1_CHECK;\r
        res = DUMMY_REP;\r
        prob = probs + IsRepG0 + state;\r
        IF_BIT_0_CHECK(prob)\r
        {\r
          UPDATE_0_CHECK;\r
          prob = probs + IsRep0Long + COMBINED_PS_STATE;\r
          IF_BIT_0_CHECK(prob)\r
          {\r
            UPDATE_0_CHECK;\r
            NORMALIZE_CHECK;\r
            return DUMMY_REP;\r
          }\r
          else\r
          {\r
            UPDATE_1_CHECK;\r
          }\r
        }\r
        else\r
        {\r
          UPDATE_1_CHECK;\r
          prob = probs + IsRepG1 + state;\r
          IF_BIT_0_CHECK(prob)\r
          {\r
            UPDATE_0_CHECK;\r
          }\r
          else\r
          {\r
            UPDATE_1_CHECK;\r
            prob = probs + IsRepG2 + state;\r
            IF_BIT_0_CHECK(prob)\r
            {\r
              UPDATE_0_CHECK;\r
            }\r
            else\r
            {\r
              UPDATE_1_CHECK;\r
            }\r
          }\r
        }\r
        state = kNumStates;\r
        prob = probs + RepLenCoder;\r
      }\r
      {\r
        unsigned limit, offset;\r
        const CLzmaProb *probLen = prob + LenChoice;\r
        IF_BIT_0_CHECK(probLen)\r
        {\r
          UPDATE_0_CHECK;\r
          probLen = prob + LenLow + GET_LEN_STATE;\r
          offset = 0;\r
          limit = 1 << kLenNumLowBits;\r
        }\r
        else\r
        {\r
          UPDATE_1_CHECK;\r
          probLen = prob + LenChoice2;\r
          IF_BIT_0_CHECK(probLen)\r
          {\r
            UPDATE_0_CHECK;\r
            probLen = prob + LenLow + GET_LEN_STATE + (1 << kLenNumLowBits);\r
            offset = kLenNumLowSymbols;\r
            limit = 1 << kLenNumLowBits;\r
          }\r
          else\r
          {\r
            UPDATE_1_CHECK;\r
            probLen = prob + LenHigh;\r
            offset = kLenNumLowSymbols * 2;\r
            limit = 1 << kLenNumHighBits;\r
          }\r
        }\r
        TREE_DECODE_CHECK(probLen, limit, len);\r
        len += offset;\r
      }\r
\r
      if (state < 4)\r
      {\r
        unsigned posSlot;\r
        prob = probs + PosSlot +\r
            ((len < kNumLenToPosStates - 1 ? len : kNumLenToPosStates - 1) <<\r
            kNumPosSlotBits);\r
        TREE_DECODE_CHECK(prob, 1 << kNumPosSlotBits, posSlot);\r
        if (posSlot >= kStartPosModelIndex)\r
        {\r
          unsigned numDirectBits = ((posSlot >> 1) - 1);\r
\r
          /* if (bufLimit - buf >= 8) return DUMMY_MATCH; */\r
\r
          if (posSlot < kEndPosModelIndex)\r
          {\r
            prob = probs + SpecPos + ((2 | (posSlot & 1)) << numDirectBits);\r
          }\r
          else\r
          {\r
            numDirectBits -= kNumAlignBits;\r
            do\r
            {\r
              NORMALIZE_CHECK\r
              range >>= 1;\r
              code -= range & (((code - range) >> 31) - 1);\r
              /* if (code >= range) code -= range; */\r
            }\r
            while (--numDirectBits);\r
            prob = probs + Align;\r
            numDirectBits = kNumAlignBits;\r
          }\r
          {\r
            unsigned i = 1;\r
            unsigned m = 1;\r
            do\r
            {\r
              REV_BIT_CHECK(prob, i, m);\r
            }\r
            while (--numDirectBits);\r
          }\r
        }\r
      }\r
    }\r
  }\r
  NORMALIZE_CHECK;\r
  return res;\r
}\r
\r
\r
void LzmaDec_InitDicAndState(CLzmaDec *p, Bool initDic, Bool initState)\r
{\r
  p->remainLen = kMatchSpecLenStart + 1;\r
  p->tempBufSize = 0;\r
\r
  if (initDic)\r
  {\r
    p->processedPos = 0;\r
    p->checkDicSize = 0;\r
    p->remainLen = kMatchSpecLenStart + 2;\r
  }\r
  if (initState)\r
    p->remainLen = kMatchSpecLenStart + 2;\r
}\r
\r
void LzmaDec_Init(CLzmaDec *p)\r
{\r
  p->dicPos = 0;\r
  LzmaDec_InitDicAndState(p, True, True);\r
}\r
\r
\r
SRes LzmaDec_DecodeToDic(CLzmaDec *p, SizeT dicLimit, const Byte *src, SizeT *srcLen,\r
    ELzmaFinishMode finishMode, ELzmaStatus *status)\r
{\r
  SizeT inSize = *srcLen;\r
  (*srcLen) = 0;\r
  \r
  *status = LZMA_STATUS_NOT_SPECIFIED;\r
\r
  if (p->remainLen > kMatchSpecLenStart)\r
  {\r
    for (; inSize > 0 && p->tempBufSize < RC_INIT_SIZE; (*srcLen)++, inSize--)\r
      p->tempBuf[p->tempBufSize++] = *src++;\r
    if (p->tempBufSize != 0 && p->tempBuf[0] != 0)\r
      return SZ_ERROR_DATA;\r
    if (p->tempBufSize < RC_INIT_SIZE)\r
    {\r
      *status = LZMA_STATUS_NEEDS_MORE_INPUT;\r
      return SZ_OK;\r
    }\r
    p->code =\r
        ((UInt32)p->tempBuf[1] << 24)\r
      | ((UInt32)p->tempBuf[2] << 16)\r
      | ((UInt32)p->tempBuf[3] << 8)\r
      | ((UInt32)p->tempBuf[4]);\r
    p->range = 0xFFFFFFFF;\r
    p->tempBufSize = 0;\r
\r
    if (p->remainLen > kMatchSpecLenStart + 1)\r
    {\r
      SizeT numProbs = LzmaProps_GetNumProbs(&p->prop);\r
      SizeT i;\r
      CLzmaProb *probs = p->probs;\r
      for (i = 0; i < numProbs; i++)\r
        probs[i] = kBitModelTotal >> 1;\r
      p->reps[0] = p->reps[1] = p->reps[2] = p->reps[3] = 1;\r
      p->state = 0;\r
    }\r
\r
    p->remainLen = 0;\r
  }\r
\r
  LzmaDec_WriteRem(p, dicLimit);\r
\r
  while (p->remainLen != kMatchSpecLenStart)\r
  {\r
      int checkEndMarkNow = 0;\r
\r
      if (p->dicPos >= dicLimit)\r
      {\r
        if (p->remainLen == 0 && p->code == 0)\r
        {\r
          *status = LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK;\r
          return SZ_OK;\r
        }\r
        if (finishMode == LZMA_FINISH_ANY)\r
        {\r
          *status = LZMA_STATUS_NOT_FINISHED;\r
          return SZ_OK;\r
        }\r
        if (p->remainLen != 0)\r
        {\r
          *status = LZMA_STATUS_NOT_FINISHED;\r
          return SZ_ERROR_DATA;\r
        }\r
        checkEndMarkNow = 1;\r
      }\r
\r
      if (p->tempBufSize == 0)\r
      {\r
        SizeT processed;\r
        const Byte *bufLimit;\r
        if (inSize < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow)\r
        {\r
          int dummyRes = LzmaDec_TryDummy(p, src, inSize);\r
          if (dummyRes == DUMMY_ERROR)\r
          {\r
            memcpy(p->tempBuf, src, inSize);\r
            p->tempBufSize = (unsigned)inSize;\r
            (*srcLen) += inSize;\r
            *status = LZMA_STATUS_NEEDS_MORE_INPUT;\r
            return SZ_OK;\r
          }\r
          if (checkEndMarkNow && dummyRes != DUMMY_MATCH)\r
          {\r
            *status = LZMA_STATUS_NOT_FINISHED;\r
            return SZ_ERROR_DATA;\r
          }\r
          bufLimit = src;\r
        }\r
        else\r
          bufLimit = src + inSize - LZMA_REQUIRED_INPUT_MAX;\r
        p->buf = src;\r
        if (LzmaDec_DecodeReal2(p, dicLimit, bufLimit) != 0)\r
          return SZ_ERROR_DATA;\r
        processed = (SizeT)(p->buf - src);\r
        (*srcLen) += processed;\r
        src += processed;\r
        inSize -= processed;\r
      }\r
      else\r
      {\r
        unsigned rem = p->tempBufSize, lookAhead = 0;\r
        while (rem < LZMA_REQUIRED_INPUT_MAX && lookAhead < inSize)\r
          p->tempBuf[rem++] = src[lookAhead++];\r
        p->tempBufSize = rem;\r
        if (rem < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow)\r
        {\r
          int dummyRes = LzmaDec_TryDummy(p, p->tempBuf, rem);\r
          if (dummyRes == DUMMY_ERROR)\r
          {\r
            (*srcLen) += lookAhead;\r
            *status = LZMA_STATUS_NEEDS_MORE_INPUT;\r
            return SZ_OK;\r
          }\r
          if (checkEndMarkNow && dummyRes != DUMMY_MATCH)\r
          {\r
            *status = LZMA_STATUS_NOT_FINISHED;\r
            return SZ_ERROR_DATA;\r
          }\r
        }\r
        p->buf = p->tempBuf;\r
        if (LzmaDec_DecodeReal2(p, dicLimit, p->buf) != 0)\r
          return SZ_ERROR_DATA;\r
        \r
        {\r
          unsigned kkk = (unsigned)(p->buf - p->tempBuf);\r
          if (rem < kkk)\r
            return SZ_ERROR_FAIL; /* some internal error */\r
          rem -= kkk;\r
          if (lookAhead < rem)\r
            return SZ_ERROR_FAIL; /* some internal error */\r
          lookAhead -= rem;\r
        }\r
        (*srcLen) += lookAhead;\r
        src += lookAhead;\r
        inSize -= lookAhead;\r
        p->tempBufSize = 0;\r
      }\r
  }\r
  \r
  if (p->code != 0)\r
    return SZ_ERROR_DATA;\r
  *status = LZMA_STATUS_FINISHED_WITH_MARK;\r
  return SZ_OK;\r
}\r
\r
\r
SRes LzmaDec_DecodeToBuf(CLzmaDec *p, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status)\r
{\r
  SizeT outSize = *destLen;\r
  SizeT inSize = *srcLen;\r
  *srcLen = *destLen = 0;\r
  for (;;)\r
  {\r
    SizeT inSizeCur = inSize, outSizeCur, dicPos;\r
    ELzmaFinishMode curFinishMode;\r
    SRes res;\r
    if (p->dicPos == p->dicBufSize)\r
      p->dicPos = 0;\r
    dicPos = p->dicPos;\r
    if (outSize > p->dicBufSize - dicPos)\r
    {\r
      outSizeCur = p->dicBufSize;\r
      curFinishMode = LZMA_FINISH_ANY;\r
    }\r
    else\r
    {\r
      outSizeCur = dicPos + outSize;\r
      curFinishMode = finishMode;\r
    }\r
\r
    res = LzmaDec_DecodeToDic(p, outSizeCur, src, &inSizeCur, curFinishMode, status);\r
    src += inSizeCur;\r
    inSize -= inSizeCur;\r
    *srcLen += inSizeCur;\r
    outSizeCur = p->dicPos - dicPos;\r
    memcpy(dest, p->dic + dicPos, outSizeCur);\r
    dest += outSizeCur;\r
    outSize -= outSizeCur;\r
    *destLen += outSizeCur;\r
    if (res != 0)\r
      return res;\r
    if (outSizeCur == 0 || outSize == 0)\r
      return SZ_OK;\r
  }\r
}\r
\r
void LzmaDec_FreeProbs(CLzmaDec *p, ISzAllocPtr alloc)\r
{\r
  ISzAlloc_Free(alloc, p->probs);\r
  p->probs = NULL;\r
}\r
\r
static void LzmaDec_FreeDict(CLzmaDec *p, ISzAllocPtr alloc)\r
{\r
  ISzAlloc_Free(alloc, p->dic);\r
  p->dic = NULL;\r
}\r
\r
void LzmaDec_Free(CLzmaDec *p, ISzAllocPtr alloc)\r
{\r
  LzmaDec_FreeProbs(p, alloc);\r
  LzmaDec_FreeDict(p, alloc);\r
}\r
\r
SRes LzmaProps_Decode(CLzmaProps *p, const Byte *data, unsigned size)\r
{\r
  UInt32 dicSize;\r
  Byte d;\r
  \r
  if (size < LZMA_PROPS_SIZE)\r
    return SZ_ERROR_UNSUPPORTED;\r
  else\r
    dicSize = data[1] | ((UInt32)data[2] << 8) | ((UInt32)data[3] << 16) | ((UInt32)data[4] << 24);\r
 \r
  if (dicSize < LZMA_DIC_MIN)\r
    dicSize = LZMA_DIC_MIN;\r
  p->dicSize = dicSize;\r
\r
  d = data[0];\r
  if (d >= (9 * 5 * 5))\r
    return SZ_ERROR_UNSUPPORTED;\r
\r
  p->lc = (Byte)(d % 9);\r
  d /= 9;\r
  p->pb = (Byte)(d / 5);\r
  p->lp = (Byte)(d % 5);\r
\r
  return SZ_OK;\r
}\r
\r
static SRes LzmaDec_AllocateProbs2(CLzmaDec *p, const CLzmaProps *propNew, ISzAllocPtr alloc)\r
{\r
  UInt32 numProbs = LzmaProps_GetNumProbs(propNew);\r
  if (!p->probs || numProbs != p->numProbs)\r
  {\r
    LzmaDec_FreeProbs(p, alloc);\r
    p->probs = (CLzmaProb *)ISzAlloc_Alloc(alloc, numProbs * sizeof(CLzmaProb));\r
    if (!p->probs)\r
      return SZ_ERROR_MEM;\r
    p->probs_1664 = p->probs + 1664;\r
    p->numProbs = numProbs;\r
  }\r
  return SZ_OK;\r
}\r
\r
SRes LzmaDec_AllocateProbs(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAllocPtr alloc)\r
{\r
  CLzmaProps propNew;\r
  RINOK(LzmaProps_Decode(&propNew, props, propsSize));\r
  RINOK(LzmaDec_AllocateProbs2(p, &propNew, alloc));\r
  p->prop = propNew;\r
  return SZ_OK;\r
}\r
\r
SRes LzmaDec_Allocate(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAllocPtr alloc)\r
{\r
  CLzmaProps propNew;\r
  SizeT dicBufSize;\r
  RINOK(LzmaProps_Decode(&propNew, props, propsSize));\r
  RINOK(LzmaDec_AllocateProbs2(p, &propNew, alloc));\r
\r
  {\r
    UInt32 dictSize = propNew.dicSize;\r
    SizeT mask = ((UInt32)1 << 12) - 1;\r
         if (dictSize >= ((UInt32)1 << 30)) mask = ((UInt32)1 << 22) - 1;\r
    else if (dictSize >= ((UInt32)1 << 22)) mask = ((UInt32)1 << 20) - 1;;\r
    dicBufSize = ((SizeT)dictSize + mask) & ~mask;\r
    if (dicBufSize < dictSize)\r
      dicBufSize = dictSize;\r
  }\r
\r
  if (!p->dic || dicBufSize != p->dicBufSize)\r
  {\r
    LzmaDec_FreeDict(p, alloc);\r
    p->dic = (Byte *)ISzAlloc_Alloc(alloc, dicBufSize);\r
    if (!p->dic)\r
    {\r
      LzmaDec_FreeProbs(p, alloc);\r
      return SZ_ERROR_MEM;\r
    }\r
  }\r
  p->dicBufSize = dicBufSize;\r
  p->prop = propNew;\r
  return SZ_OK;\r
}\r
\r
SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,\r
    const Byte *propData, unsigned propSize, ELzmaFinishMode finishMode,\r
    ELzmaStatus *status, ISzAllocPtr alloc)\r
{\r
  CLzmaDec p;\r
  SRes res;\r
  SizeT outSize = *destLen, inSize = *srcLen;\r
  *destLen = *srcLen = 0;\r
  *status = LZMA_STATUS_NOT_SPECIFIED;\r
  if (inSize < RC_INIT_SIZE)\r
    return SZ_ERROR_INPUT_EOF;\r
  LzmaDec_Construct(&p);\r
  RINOK(LzmaDec_AllocateProbs(&p, propData, propSize, alloc));\r
  p.dic = dest;\r
  p.dicBufSize = outSize;\r
  LzmaDec_Init(&p);\r
  *srcLen = inSize;\r
  res = LzmaDec_DecodeToDic(&p, outSize, src, srcLen, finishMode, status);\r
  *destLen = p.dicPos;\r
  if (res == SZ_OK && *status == LZMA_STATUS_NEEDS_MORE_INPUT)\r
    res = SZ_ERROR_INPUT_EOF;\r
  LzmaDec_FreeProbs(&p, alloc);\r
  return res;\r
}\r