You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
188 lines
4.3 KiB
188 lines
4.3 KiB
![]()
4 years ago
|
/* Ppmd7Enc.c -- PPMdH Encoder
|
||
|
2010-03-12 : 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 (1 << 24)
|
||
|
|
||
|
void Ppmd7z_RangeEnc_Init(CPpmd7z_RangeEnc *p)
|
||
|
{
|
||
|
p->Low = 0;
|
||
|
p->Range = 0xFFFFFFFF;
|
||
|
p->Cache = 0;
|
||
|
p->CacheSize = 1;
|
||
|
}
|
||
|
|
||
|
static void RangeEnc_ShiftLow(CPpmd7z_RangeEnc *p)
|
||
|
{
|
||
|
if ((UInt32)p->Low < (UInt32)0xFF000000 || (unsigned)(p->Low >> 32) != 0)
|
||
|
{
|
||
|
Byte temp = p->Cache;
|
||
|
do
|
||
|
{
|
||
|
p->Stream->Write(p->Stream, (Byte)(temp + (Byte)(p->Low >> 32)));
|
||
|
temp = 0xFF;
|
||
|
}
|
||
|
while(--p->CacheSize != 0);
|
||
|
p->Cache = (Byte)((UInt32)p->Low >> 24);
|
||
|
}
|
||
|
p->CacheSize++;
|
||
|
p->Low = (UInt32)p->Low << 8;
|
||
|
}
|
||
|
|
||
|
static void RangeEnc_Encode(CPpmd7z_RangeEnc *p, UInt32 start, UInt32 size, UInt32 total)
|
||
|
{
|
||
|
p->Low += start * (p->Range /= total);
|
||
|
p->Range *= size;
|
||
|
while (p->Range < kTopValue)
|
||
|
{
|
||
|
p->Range <<= 8;
|
||
|
RangeEnc_ShiftLow(p);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void RangeEnc_EncodeBit_0(CPpmd7z_RangeEnc *p, UInt32 size0)
|
||
|
{
|
||
|
p->Range = (p->Range >> 14) * size0;
|
||
|
while (p->Range < kTopValue)
|
||
|
{
|
||
|
p->Range <<= 8;
|
||
|
RangeEnc_ShiftLow(p);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void RangeEnc_EncodeBit_1(CPpmd7z_RangeEnc *p, UInt32 size0)
|
||
|
{
|
||
|
UInt32 newBound = (p->Range >> 14) * size0;
|
||
|
p->Low += newBound;
|
||
|
p->Range -= newBound;
|
||
|
while (p->Range < kTopValue)
|
||
|
{
|
||
|
p->Range <<= 8;
|
||
|
RangeEnc_ShiftLow(p);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void Ppmd7z_RangeEnc_FlushData(CPpmd7z_RangeEnc *p)
|
||
|
{
|
||
|
unsigned i;
|
||
|
for (i = 0; i < 5; i++)
|
||
|
RangeEnc_ShiftLow(p);
|
||
|
}
|
||
|
|
||
|
|
||
|
#define MASK(sym) ((signed char *)charMask)[sym]
|
||
|
|
||
|
void Ppmd7_EncodeSymbol(CPpmd7 *p, CPpmd7z_RangeEnc *rc, 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;
|
||
|
if (s->Symbol == symbol)
|
||
|
{
|
||
|
RangeEnc_Encode(rc, 0, s->Freq, p->MinContext->SummFreq);
|
||
|
p->FoundState = s;
|
||
|
Ppmd7_Update1_0(p);
|
||
|
return;
|
||
|
}
|
||
|
p->PrevSuccess = 0;
|
||
|
sum = s->Freq;
|
||
|
i = p->MinContext->NumStats - 1;
|
||
|
do
|
||
|
{
|
||
|
if ((++s)->Symbol == symbol)
|
||
|
{
|
||
|
RangeEnc_Encode(rc, sum, s->Freq, p->MinContext->SummFreq);
|
||
|
p->FoundState = s;
|
||
|
Ppmd7_Update1(p);
|
||
|
return;
|
||
|
}
|
||
|
sum += s->Freq;
|
||
|
}
|
||
|
while (--i);
|
||
|
|
||
|
p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol];
|
||
|
PPMD_SetAllBitsIn256Bytes(charMask);
|
||
|
MASK(s->Symbol) = 0;
|
||
|
i = p->MinContext->NumStats - 1;
|
||
|
do { MASK((--s)->Symbol) = 0; } while (--i);
|
||
|
RangeEnc_Encode(rc, sum, p->MinContext->SummFreq - sum, p->MinContext->SummFreq);
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
UInt16 *prob = Ppmd7_GetBinSumm(p);
|
||
|
CPpmd_State *s = Ppmd7Context_OneState(p->MinContext);
|
||
|
if (s->Symbol == symbol)
|
||
|
{
|
||
|
RangeEnc_EncodeBit_0(rc, *prob);
|
||
|
*prob = (UInt16)PPMD_UPDATE_PROB_0(*prob);
|
||
|
p->FoundState = s;
|
||
|
Ppmd7_UpdateBin(p);
|
||
|
return;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
RangeEnc_EncodeBit_1(rc, *prob);
|
||
|
*prob = (UInt16)PPMD_UPDATE_PROB_1(*prob);
|
||
|
p->InitEsc = PPMD7_kExpEscape[*prob >> 10];
|
||
|
PPMD_SetAllBitsIn256Bytes(charMask);
|
||
|
MASK(s->Symbol) = 0;
|
||
|
p->PrevSuccess = 0;
|
||
|
}
|
||
|
}
|
||
|
for (;;)
|
||
|
{
|
||
|
UInt32 escFreq;
|
||
|
CPpmd_See *see;
|
||
|
CPpmd_State *s;
|
||
|
UInt32 sum;
|
||
|
unsigned i, numMasked = p->MinContext->NumStats;
|
||
|
do
|
||
|
{
|
||
|
p->OrderFall++;
|
||
|
if (!p->MinContext->Suffix)
|
||
|
return; /* EndMarker (symbol = -1) */
|
||
|
p->MinContext = Ppmd7_GetContext(p, p->MinContext->Suffix);
|
||
|
}
|
||
|
while (p->MinContext->NumStats == numMasked);
|
||
|
|
||
|
see = Ppmd7_MakeEscFreq(p, numMasked, &escFreq);
|
||
|
s = Ppmd7_GetStats(p, p->MinContext);
|
||
|
sum = 0;
|
||
|
i = p->MinContext->NumStats;
|
||
|
do
|
||
|
{
|
||
|
int cur = s->Symbol;
|
||
|
if (cur == symbol)
|
||
|
{
|
||
|
UInt32 low = sum;
|
||
|
CPpmd_State *s1 = s;
|
||
|
do
|
||
|
{
|
||
|
sum += (s->Freq & (int)(MASK(s->Symbol)));
|
||
|
s++;
|
||
|
}
|
||
|
while (--i);
|
||
|
RangeEnc_Encode(rc, low, s1->Freq, sum + escFreq);
|
||
|
Ppmd_See_Update(see);
|
||
|
p->FoundState = s1;
|
||
|
Ppmd7_Update2(p);
|
||
|
return;
|
||
|
}
|
||
|
sum += (s->Freq & (int)(MASK(cur)));
|
||
|
MASK(cur) = 0;
|
||
|
s++;
|
||
|
}
|
||
|
while (--i);
|
||
|
|
||
|
RangeEnc_Encode(rc, sum, escFreq, sum + escFreq);
|
||
|
see->Summ = (UInt16)(see->Summ + sum + escFreq);
|
||
|
}
|
||
|
}
|