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337 lines (289 loc) · 7.58 KB
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Copy pathPpmd7Enc.c
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337 lines (289 loc) · 7.58 KB
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/* Ppmd7Enc.c -- Ppmd7z (PPMdH with 7z Range Coder) Encoder
2023-09-07 : Igor Pavlov : Public domain
This code is based on:
PPMd var.H (2001): Dmitry Shkarin : Public domain */
#include "Precomp.h"
#include "Ppmd7.h"
#define kTopValue ((UInt32)1 << 24)
#define R (&p->rc.enc)
void Ppmd7z_Init_RangeEnc(CPpmd7 *p)
{
R->Low = 0;
R->Range = 0xFFFFFFFF;
R->Cache = 0;
R->CacheSize = 1;
}
Z7_NO_INLINE
static void Ppmd7z_RangeEnc_ShiftLow(CPpmd7 *p)
{
if ((UInt32)R->Low < (UInt32)0xFF000000 || (unsigned)(R->Low >> 32) != 0)
{
Byte temp = R->Cache;
do
{
IByteOut_Write(R->Stream, (Byte)(temp + (Byte)(R->Low >> 32)));
temp = 0xFF;
}
while (--R->CacheSize != 0);
R->Cache = (Byte)((UInt32)R->Low >> 24);
}
R->CacheSize++;
R->Low = (UInt32)((UInt32)R->Low << 8);
}
#define RC_NORM_BASE(p) if (R->Range < kTopValue) { R->Range <<= 8; Ppmd7z_RangeEnc_ShiftLow(p);
#define RC_NORM_1(p) RC_NORM_BASE(p) }
#define RC_NORM(p) RC_NORM_BASE(p) RC_NORM_BASE(p) }}
// we must use only one type of Normalization from two: LOCAL or REMOTE
#define RC_NORM_LOCAL(p) // RC_NORM(p)
#define RC_NORM_REMOTE(p) RC_NORM(p)
/*
#define Ppmd7z_RangeEnc_Encode(p, start, _size_) \
{ UInt32 size = _size_; \
R->Low += start * R->Range; \
R->Range *= size; \
RC_NORM_LOCAL(p); }
*/
Z7_FORCE_INLINE
// Z7_NO_INLINE
static void Ppmd7z_RangeEnc_Encode(CPpmd7 *p, UInt32 start, UInt32 size)
{
R->Low += start * R->Range;
R->Range *= size;
RC_NORM_LOCAL(p)
}
void Ppmd7z_Flush_RangeEnc(CPpmd7 *p)
{
unsigned i;
for (i = 0; i < 5; i++)
Ppmd7z_RangeEnc_ShiftLow(p);
}
#define RC_Encode(start, size) Ppmd7z_RangeEnc_Encode(p, start, size);
#define RC_EncodeFinal(start, size) RC_Encode(start, size) RC_NORM_REMOTE(p)
#define CTX(ref) ((CPpmd7_Context *)Ppmd7_GetContext(p, ref))
#define SUFFIX(ctx) CTX((ctx)->Suffix)
// typedef CPpmd7_Context * CTX_PTR;
#define SUCCESSOR(p) Ppmd_GET_SUCCESSOR(p)
void Ppmd7_UpdateModel(CPpmd7 *p);
#define MASK(sym) ((Byte *)charMask)[sym]
Z7_FORCE_INLINE
static
void Ppmd7z_EncodeSymbol(CPpmd7 *p, int symbol)
{
size_t charMask[256 / sizeof(size_t)];
if (p->MinContext->NumStats != 1)
{
CPpmd_State *s = Ppmd7_GetStats(p, p->MinContext);
UInt32 sum;
unsigned i;
R->Range /= p->MinContext->Union2.SummFreq;
if (s->Symbol == symbol)
{
// R->Range /= p->MinContext->Union2.SummFreq;
RC_EncodeFinal(0, s->Freq)
p->FoundState = s;
Ppmd7_Update1_0(p);
return;
}
p->PrevSuccess = 0;
sum = s->Freq;
i = (unsigned)p->MinContext->NumStats - 1;
do
{
if ((++s)->Symbol == symbol)
{
// R->Range /= p->MinContext->Union2.SummFreq;
RC_EncodeFinal(sum, s->Freq)
p->FoundState = s;
Ppmd7_Update1(p);
return;
}
sum += s->Freq;
}
while (--i);
// R->Range /= p->MinContext->Union2.SummFreq;
RC_Encode(sum, p->MinContext->Union2.SummFreq - sum)
p->HiBitsFlag = PPMD7_HiBitsFlag_3(p->FoundState->Symbol);
PPMD_SetAllBitsIn256Bytes(charMask)
// MASK(s->Symbol) = 0;
// i = p->MinContext->NumStats - 1;
// do { MASK((--s)->Symbol) = 0; } while (--i);
{
CPpmd_State *s2 = Ppmd7_GetStats(p, p->MinContext);
MASK(s->Symbol) = 0;
do
{
const unsigned sym0 = s2[0].Symbol;
const unsigned sym1 = s2[1].Symbol;
s2 += 2;
MASK(sym0) = 0;
MASK(sym1) = 0;
}
while (s2 < s);
}
}
else
{
UInt16 *prob = Ppmd7_GetBinSumm(p);
CPpmd_State *s = Ppmd7Context_OneState(p->MinContext);
UInt32 pr = *prob;
const UInt32 bound = (R->Range >> 14) * pr;
pr = PPMD_UPDATE_PROB_1(pr);
if (s->Symbol == symbol)
{
*prob = (UInt16)(pr + (1 << PPMD_INT_BITS));
// RangeEnc_EncodeBit_0(p, bound);
R->Range = bound;
RC_NORM_1(p)
// p->FoundState = s;
// Ppmd7_UpdateBin(p);
{
const unsigned freq = s->Freq;
CPpmd7_Context *c = CTX(SUCCESSOR(s));
p->FoundState = s;
p->PrevSuccess = 1;
p->RunLength++;
s->Freq = (Byte)(freq + (freq < 128));
// NextContext(p);
if (p->OrderFall == 0 && (const Byte *)c > p->Text)
p->MaxContext = p->MinContext = c;
else
Ppmd7_UpdateModel(p);
}
return;
}
*prob = (UInt16)pr;
p->InitEsc = p->ExpEscape[pr >> 10];
// RangeEnc_EncodeBit_1(p, bound);
R->Low += bound;
R->Range -= bound;
RC_NORM_LOCAL(p)
PPMD_SetAllBitsIn256Bytes(charMask)
MASK(s->Symbol) = 0;
p->PrevSuccess = 0;
}
for (;;)
{
CPpmd_See *see;
CPpmd_State *s;
UInt32 sum, escFreq;
CPpmd7_Context *mc;
unsigned i, numMasked;
RC_NORM_REMOTE(p)
mc = p->MinContext;
numMasked = mc->NumStats;
do
{
p->OrderFall++;
if (!mc->Suffix)
return; /* EndMarker (symbol = -1) */
mc = Ppmd7_GetContext(p, mc->Suffix);
i = mc->NumStats;
}
while (i == numMasked);
p->MinContext = mc;
// see = Ppmd7_MakeEscFreq(p, numMasked, &escFreq);
{
if (i != 256)
{
unsigned nonMasked = i - numMasked;
see = p->See[(unsigned)p->NS2Indx[(size_t)nonMasked - 1]]
+ p->HiBitsFlag
+ (nonMasked < (unsigned)SUFFIX(mc)->NumStats - i)
+ 2 * (unsigned)(mc->Union2.SummFreq < 11 * i)
+ 4 * (unsigned)(numMasked > nonMasked);
{
// if (see->Summ) field is larger than 16-bit, we need only low 16 bits of Summ
unsigned summ = (UInt16)see->Summ; // & 0xFFFF
unsigned r = (summ >> see->Shift);
see->Summ = (UInt16)(summ - r);
escFreq = r + (r == 0);
}
}
else
{
see = &p->DummySee;
escFreq = 1;
}
}
s = Ppmd7_GetStats(p, mc);
sum = 0;
// i = mc->NumStats;
do
{
const unsigned cur = s->Symbol;
if ((int)cur == symbol)
{
const UInt32 low = sum;
const UInt32 freq = s->Freq;
unsigned num2;
Ppmd_See_UPDATE(see)
p->FoundState = s;
sum += escFreq;
num2 = i / 2;
i &= 1;
sum += freq & (0 - (UInt32)i);
if (num2 != 0)
{
s += i;
do
{
const unsigned sym0 = s[0].Symbol;
const unsigned sym1 = s[1].Symbol;
s += 2;
sum += (s[-2].Freq & (unsigned)(MASK(sym0)));
sum += (s[-1].Freq & (unsigned)(MASK(sym1)));
}
while (--num2);
}
R->Range /= sum;
RC_EncodeFinal(low, freq)
Ppmd7_Update2(p);
return;
}
sum += (s->Freq & (unsigned)(MASK(cur)));
s++;
}
while (--i);
{
const UInt32 total = sum + escFreq;
see->Summ = (UInt16)(see->Summ + total);
R->Range /= total;
RC_Encode(sum, escFreq)
}
{
const CPpmd_State *s2 = Ppmd7_GetStats(p, p->MinContext);
s--;
MASK(s->Symbol) = 0;
do
{
const unsigned sym0 = s2[0].Symbol;
const unsigned sym1 = s2[1].Symbol;
s2 += 2;
MASK(sym0) = 0;
MASK(sym1) = 0;
}
while (s2 < s);
}
}
}
void Ppmd7z_EncodeSymbols(CPpmd7 *p, const Byte *buf, const Byte *lim)
{
for (; buf < lim; buf++)
{
Ppmd7z_EncodeSymbol(p, *buf);
}
}
#undef kTopValue
#undef WRITE_BYTE
#undef RC_NORM_BASE
#undef RC_NORM_1
#undef RC_NORM
#undef RC_NORM_LOCAL
#undef RC_NORM_REMOTE
#undef R
#undef RC_Encode
#undef RC_EncodeFinal
#undef SUFFIX
#undef CTX
#undef SUCCESSOR
#undef MASK