Coverage Report

Created: 2024-07-27 06:12

/src/lzma-fuzz/sdk/C/Ppmd7Enc.c
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Source (jump to first uncovered line)
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/* Ppmd7Enc.c -- PPMdH Encoder
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2017-04-03 : Igor Pavlov : Public domain
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This code is based on PPMd var.H (2001): Dmitry Shkarin : Public domain */
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#include "Precomp.h"
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#include "Ppmd7.h"
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14.1M
#define kTopValue (1 << 24)
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void Ppmd7z_RangeEnc_Init(CPpmd7z_RangeEnc *p)
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1.61k
{
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1.61k
  p->Low = 0;
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1.61k
  p->Range = 0xFFFFFFFF;
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1.61k
  p->Cache = 0;
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1.61k
  p->CacheSize = 1;
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1.61k
}
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static void RangeEnc_ShiftLow(CPpmd7z_RangeEnc *p)
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5.67M
{
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5.67M
  if ((UInt32)p->Low < (UInt32)0xFF000000 || (unsigned)(p->Low >> 32) != 0)
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5.65M
  {
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5.65M
    Byte temp = p->Cache;
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5.65M
    do
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5.67M
    {
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5.67M
      IByteOut_Write(p->Stream, (Byte)(temp + (Byte)(p->Low >> 32)));
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5.67M
      temp = 0xFF;
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5.67M
    }
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5.67M
    while (--p->CacheSize != 0);
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5.65M
    p->Cache = (Byte)((UInt32)p->Low >> 24);
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5.65M
  }
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5.67M
  p->CacheSize++;
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5.67M
  p->Low = (UInt32)p->Low << 8;
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5.67M
}
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static void RangeEnc_Encode(CPpmd7z_RangeEnc *p, UInt32 start, UInt32 size, UInt32 total)
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6.67M
{
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6.67M
  p->Low += start * (p->Range /= total);
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6.67M
  p->Range *= size;
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12.2M
  while (p->Range < kTopValue)
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5.59M
  {
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5.59M
    p->Range <<= 8;
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5.59M
    RangeEnc_ShiftLow(p);
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5.59M
  }
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6.67M
}
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static void RangeEnc_EncodeBit_0(CPpmd7z_RangeEnc *p, UInt32 size0)
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1.50M
{
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1.50M
  p->Range = (p->Range >> 14) * size0;
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1.52M
  while (p->Range < kTopValue)
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24.0k
  {
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24.0k
    p->Range <<= 8;
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24.0k
    RangeEnc_ShiftLow(p);
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24.0k
  }
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1.50M
}
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static void RangeEnc_EncodeBit_1(CPpmd7z_RangeEnc *p, UInt32 size0)
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329k
{
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329k
  UInt32 newBound = (p->Range >> 14) * size0;
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329k
  p->Low += newBound;
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329k
  p->Range -= newBound;
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376k
  while (p->Range < kTopValue)
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47.3k
  {
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47.3k
    p->Range <<= 8;
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47.3k
    RangeEnc_ShiftLow(p);
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47.3k
  }
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329k
}
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void Ppmd7z_RangeEnc_FlushData(CPpmd7z_RangeEnc *p)
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1.61k
{
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1.61k
  unsigned i;
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9.70k
  for (i = 0; i < 5; i++)
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8.09k
    RangeEnc_ShiftLow(p);
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1.61k
}
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147M
#define MASK(sym) ((signed char *)charMask)[sym]
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void Ppmd7_EncodeSymbol(CPpmd7 *p, CPpmd7z_RangeEnc *rc, int symbol)
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7.95M
{
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7.95M
  size_t charMask[256 / sizeof(size_t)];
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7.95M
  if (p->MinContext->NumStats != 1)
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6.12M
  {
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6.12M
    CPpmd_State *s = Ppmd7_GetStats(p, p->MinContext);
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6.12M
    UInt32 sum;
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6.12M
    unsigned i;
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6.12M
    if (s->Symbol == symbol)
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1.44M
    {
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1.44M
      RangeEnc_Encode(rc, 0, s->Freq, p->MinContext->SummFreq);
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1.44M
      p->FoundState = s;
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1.44M
      Ppmd7_Update1_0(p);
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1.44M
      return;
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1.44M
    }
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4.68M
    p->PrevSuccess = 0;
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4.68M
    sum = s->Freq;
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4.68M
    i = p->MinContext->NumStats - 1;
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4.68M
    do
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597M
    {
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597M
      if ((++s)->Symbol == symbol)
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4.53M
      {
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4.53M
        RangeEnc_Encode(rc, sum, s->Freq, p->MinContext->SummFreq);
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4.53M
        p->FoundState = s;
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4.53M
        Ppmd7_Update1(p);
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4.53M
        return;
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4.53M
      }
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592M
      sum += s->Freq;
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592M
    }
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592M
    while (--i);
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152k
    p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol];
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152k
    PPMD_SetAllBitsIn256Bytes(charMask);
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152k
    MASK(s->Symbol) = 0;
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152k
    i = p->MinContext->NumStats - 1;
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486k
    do { MASK((--s)->Symbol) = 0; } while (--i);
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152k
    RangeEnc_Encode(rc, sum, p->MinContext->SummFreq - sum, p->MinContext->SummFreq);
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152k
  }
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1.83M
  else
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1.83M
  {
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1.83M
    UInt16 *prob = Ppmd7_GetBinSumm(p);
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1.83M
    CPpmd_State *s = Ppmd7Context_OneState(p->MinContext);
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1.83M
    if (s->Symbol == symbol)
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1.50M
    {
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1.50M
      RangeEnc_EncodeBit_0(rc, *prob);
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1.50M
      *prob = (UInt16)PPMD_UPDATE_PROB_0(*prob);
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1.50M
      p->FoundState = s;
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1.50M
      Ppmd7_UpdateBin(p);
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1.50M
      return;
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1.50M
    }
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329k
    else
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329k
    {
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329k
      RangeEnc_EncodeBit_1(rc, *prob);
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329k
      *prob = (UInt16)PPMD_UPDATE_PROB_1(*prob);
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329k
      p->InitEsc = PPMD7_kExpEscape[*prob >> 10];
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329k
      PPMD_SetAllBitsIn256Bytes(charMask);
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329k
      MASK(s->Symbol) = 0;
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329k
      p->PrevSuccess = 0;
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329k
    }
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1.83M
  }
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481k
  for (;;)
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549k
  {
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549k
    UInt32 escFreq;
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549k
    CPpmd_See *see;
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549k
    CPpmd_State *s;
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549k
    UInt32 sum;
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549k
    unsigned i, numMasked = p->MinContext->NumStats;
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549k
    do
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769k
    {
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769k
      p->OrderFall++;
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769k
      if (!p->MinContext->Suffix)
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0
        return; /* EndMarker (symbol = -1) */
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769k
      p->MinContext = Ppmd7_GetContext(p, p->MinContext->Suffix);
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769k
    }
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769k
    while (p->MinContext->NumStats == numMasked);
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549k
    see = Ppmd7_MakeEscFreq(p, numMasked, &escFreq);
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549k
    s = Ppmd7_GetStats(p, p->MinContext);
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549k
    sum = 0;
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549k
    i = p->MinContext->NumStats;
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549k
    do
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40.9M
    {
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40.9M
      int cur = s->Symbol;
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40.9M
      if (cur == symbol)
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481k
      {
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481k
        UInt32 low = sum;
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481k
        CPpmd_State *s1 = s;
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481k
        do
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65.6M
        {
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65.6M
          sum += (s->Freq & (int)(MASK(s->Symbol)));
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65.6M
          s++;
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65.6M
        }
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65.6M
        while (--i);
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481k
        RangeEnc_Encode(rc, low, s1->Freq, sum + escFreq);
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481k
        Ppmd_See_Update(see);
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481k
        p->FoundState = s1;
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481k
        Ppmd7_Update2(p);
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481k
        return;
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481k
      }
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40.4M
      sum += (s->Freq & (int)(MASK(cur)));
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40.4M
      MASK(cur) = 0;
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40.4M
      s++;
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40.4M
    }
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40.4M
    while (--i);
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68.3k
    RangeEnc_Encode(rc, sum, escFreq, sum + escFreq);
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68.3k
    see->Summ = (UInt16)(see->Summ + sum + escFreq);
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68.3k
  }
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481k
}