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/****************************************************************************
* This file is part of PPMd project *
* Written and distributed to public domain by Dmitry Shkarin 1997, *
* 1999-2001, 2006 *
* Contents: PPMII model description and encoding/decoding routines *
****************************************************************************/
#include <string.h>
#include "PPMd.h"
#pragma hdrstop
#include "Coder.hpp"
#include "SubAlloc.hpp"
enum { UP_FREQ=5, INT_BITS=7, PERIOD_BITS=7, TOT_BITS=INT_BITS+PERIOD_BITS,
INTERVAL=1 << INT_BITS, BIN_SCALE=1 << TOT_BITS, ROUND=16, MAX_FREQ=124,
O_BOUND=9 };
static _THREAD1 struct SEE2_CONTEXT { // SEE-contexts for PPM-contexts with masked symbols
WORD Summ;
BYTE Shift, Count;
void init(UINT InitVal) { Summ=InitVal << (Shift=PERIOD_BITS-4); Count=7; }
UINT getMean() {
UINT RetVal=(Summ >> Shift); Summ -= RetVal;
return RetVal+!RetVal;
}
void update() { if (--Count == 0) setShift_rare(); }
void setShift_rare();
} _THREAD SEE2Cont[23][32], DummySEE2Cont;
#pragma pack(1)
static _THREAD1 struct PPM_CONTEXT {
struct STATE {
_BYTE Symbol, Freq;
_DWORD iSuccessor;
_PAD_TO_64(Dummy)
PPM_CONTEXT* getSucc() const { return (PPM_CONTEXT*)Indx2Ptr(iSuccessor); }
};
_BYTE NumStats, Flags; // Notes:
_WORD SummFreq; // 1. NumStats & NumMasked contain
_DWORD iStats; // number of symbols minus 1
_PAD_TO_64(Dummy1) // 2. contexts example:
_DWORD iSuffix; // MaxOrder:
_PAD_TO_64(Dummy2) // ABCD context
inline void encodeBinSymbol(int symbol);// BCD suffix
inline void encodeSymbol1(int symbol);// BCDE successor
inline void encodeSymbol2(int symbol);// other orders:
inline void decodeBinSymbol();// BCD context
inline void decodeSymbol1();// CD suffix
inline void decodeSymbol2();// BCDE successor
inline void update1(STATE* p);
inline void update2(STATE* p);
inline SEE2_CONTEXT* makeEscFreq2();
void rescale();
_DWORD cutOff(int Order);
STATE& oneState() const { return (STATE&) SummFreq; }
STATE* getStats() const { return (STATE*)Indx2Ptr(iStats); }
PPM_CONTEXT* suff() const { return (PPM_CONTEXT*)Indx2Ptr(iSuffix); }
} * _THREAD MaxContext;
#pragma pack()
static BYTE NS2BSIndx[256], QTable[260]; // constants
static _THREAD1 PPM_CONTEXT::STATE* _THREAD FoundState; // found next state transition
static _THREAD1 int _THREAD BSumm, _THREAD OrderFall, _THREAD RunLength;
static _THREAD1 int _THREAD InitRL, _THREAD MaxOrder;
static _THREAD1 BYTE _THREAD CharMask[256], _THREAD NumMasked, _THREAD PrevSuccess;
static _THREAD1 BYTE _THREAD EscCount, _THREAD PrintCount;
static _THREAD1 WORD _THREAD BinSumm[25][64]; // binary SEE-contexts
static _THREAD1 BOOL _THREAD CutOff;
inline void SWAP(PPM_CONTEXT::STATE& s1,PPM_CONTEXT::STATE& s2) {
PPM_CONTEXT::STATE t1 = s1;
s1 = s2;
s2 = t1;
}
inline void StateCpy(PPM_CONTEXT::STATE& s1,const PPM_CONTEXT::STATE& s2) {
s1 = s2;
}
void SEE2_CONTEXT::setShift_rare()
{
UINT i=Summ >> Shift;
i=PERIOD_BITS-(i > 40)-(i > 280)-(i > 1020);
if (i < Shift) { Summ >>= 1; Shift--; }
else if (i > Shift) { Summ <<= 1; Shift++; }
Count=6 << Shift;
}
static struct PPMD_STARTUP { inline PPMD_STARTUP(); } const PPMd_StartUp;
inline PPMD_STARTUP::PPMD_STARTUP() // constants initialization
{
UINT i, k, m, Step;
for (i=0,k=1;i < N1 ;i++,k += 1) Indx2Units[i]=k;
for (k++;i < N1+N2 ;i++,k += 2) Indx2Units[i]=k;
for (k++;i < N1+N2+N3 ;i++,k += 3) Indx2Units[i]=k;
for (k++;i < N1+N2+N3+N4;i++,k += 4) Indx2Units[i]=k;
for (k=i=0;k < 128;k++) {
i += (Indx2Units[i] < k+1); Units2Indx[k]=i;
}
NS2BSIndx[0]=2*0; NS2BSIndx[1]=NS2BSIndx[2]=2*1;
memset(NS2BSIndx+3,2*2,26); memset(NS2BSIndx+29,2*3,256-29);
for (i=0;i < UP_FREQ;i++) QTable[i]=i;
for (m=i=UP_FREQ, k=Step=1;i < 260;i++) {
QTable[i]=m;
if ( !--k ) { k = ++Step; m++; }
}
}
static void _FASTCALL StartModelRare(int MaxOrder,BOOL CutOff)
{
int i, k, s;
BYTE i2f[25];
memset(CharMask,0,sizeof(CharMask)); EscCount=PrintCount=1;
if (MaxOrder < 2) { // we are in solid mode
OrderFall=::MaxOrder;
for (PPM_CONTEXT* pc=MaxContext;pc->iSuffix != 0;pc=pc->suff())
OrderFall--;
return;
}
OrderFall=::MaxOrder=MaxOrder; ::CutOff=CutOff;
InitSubAllocator();
RunLength=InitRL=-((MaxOrder < 13)?MaxOrder:13);
MaxContext = (PPM_CONTEXT*)AllocContext();
MaxContext->SummFreq=(MaxContext->NumStats=255)+2;
MaxContext->iStats = Ptr2Indx(AllocUnits(256/2));
for (PrevSuccess=i=MaxContext->iSuffix=MaxContext->Flags=0;i < 256;i++) {
MaxContext->getStats()[i].Symbol=i; MaxContext->getStats()[i].Freq=1;
MaxContext->getStats()[i].iSuccessor=0;
}
for (k=i=0;i < 25;i2f[i++]=k+1)
while (QTable[k] == i) k++;
static const signed char EscCoef[12]={16,-10,1,51,14,89,23,35,64,26,-42,43};
for (k=0;k < 64;k++) {
for (s=i=0;i < 6;i++) s += EscCoef[2*i+((k >> i) & 1)];
s=128*CLAMP(s,32,256-32);
for (i=0;i < 25;i++) BinSumm[i][k]=BIN_SCALE-s/i2f[i];
}
for (i=0;i < 23;i++)
for (k=0;k < 32;k++) SEE2Cont[i][k].init(8*i+5);
}
inline void AuxCutOff(PPM_CONTEXT::STATE* p,int Order) {
if (Order < MaxOrder) {
PrefetchData(p->getSucc());
p->iSuccessor=p->getSucc()->cutOff(Order+1);
} else p->iSuccessor=0;
}
_DWORD PPM_CONTEXT::cutOff(int Order)
{
int i, tmp, EscFreq, Scale;
STATE* p, * p0;
if ( !NumStats ) {
if ((_BYTE*)(p=&oneState())->getSucc() >= UnitsStart) {
AuxCutOff(p,Order);
if (p->iSuccessor || Order < O_BOUND)
goto AT_RETURN;
}
REMOVE: FreeUnit(this); return 0;
}
iStats = Ptr2Indx(p0=(STATE*)MoveUnitsUp(getStats(),tmp=(NumStats+2) >> 1));
for (p=p0+(i=NumStats);p >= p0;p--)
if ((_BYTE*)p->getSucc() < UnitsStart) {
p->iSuccessor=0; SWAP(*p,p0[i--]);
} else AuxCutOff(p,Order);
if (i != NumStats && Order) {
NumStats=i; p=p0;
if (i < 0) { FreeUnits(p,tmp); goto REMOVE; }
else if (i == 0) {
Flags=(Flags & 0x10)+0x08*(p->Symbol >= 0x40);
p->Freq=1+(2*(p->Freq-1))/(SummFreq-p->Freq);
StateCpy(oneState(),*p); FreeUnits(p,tmp);
} else {
iStats = Ptr2Indx(p=(STATE*)ShrinkUnits(p0,tmp,(i+2) >> 1));
Scale=(SummFreq > 16*i); EscFreq=SummFreq-p->Freq;
Flags=(Flags & (0x10+0x04*Scale))+0x08*(p->Symbol >= 0x40);
SummFreq=p->Freq=(p->Freq+Scale) >> Scale;
do {
EscFreq -= (++p)->Freq;
SummFreq += (p->Freq=(p->Freq+Scale) >> Scale);
Flags |= 0x08*(p->Symbol >= 0x40);
} while ( --i );
SummFreq += (EscFreq=(EscFreq+Scale) >> Scale);
}
}
AT_RETURN:
if ((_BYTE*)this == UnitsStart) {
UnitsCpy(AuxUnit,this,1); return Ptr2Indx(AuxUnit);
} else if((_BYTE*)suff() == UnitsStart) iSuffix=Ptr2Indx(AuxUnit);
return Ptr2Indx(this);
}
static void RestoreModelRare(PPM_CONTEXT* pc)
{
pText=HeapStart;
if (!CutOff || GetUsedMemory() < (SubAllocatorSize >> 2)) {
StartModelRare(MaxOrder,CutOff); PrintCount=0xFF;
EscCount=0; return;
}
for (PPM_CONTEXT::STATE* p;MaxContext->NumStats == 1 && MaxContext != pc &&
(_BYTE*)(p=MaxContext->getStats())[1].getSucc() < UnitsStart;
MaxContext=MaxContext->suff()) {
MaxContext->Flags=(MaxContext->Flags & 0x10)+0x08*(p->Symbol >= 0x40);
p->Freq=(p->Freq+1) >> 1; StateCpy(MaxContext->oneState(),*p);
MaxContext->NumStats=0; FreeUnits(p,1);
}
while ( MaxContext->iSuffix ) MaxContext=MaxContext->suff();
AuxUnit=UnitsStart; ExpandTextArea();
do {
PrepareTextArea(); MaxContext->cutOff(0);
ExpandTextArea();
} while (GetUsedMemory() > 3*(SubAllocatorSize >> 2));
GlueCount=GlueCount1=0; OrderFall=MaxOrder;
}
static _DWORD _FASTCALL CreateSuccessors(BOOL Skip,PPM_CONTEXT::STATE* p,PPM_CONTEXT* pc);
inline _DWORD ReduceOrder(PPM_CONTEXT::STATE* p,PPM_CONTEXT* pc)
{
PPM_CONTEXT::STATE* p1;
PPM_CONTEXT* pc1=pc;
_DWORD iUpBranch = FoundState->iSuccessor = Ptr2Indx(pText);
BYTE tmp, sym=FoundState->Symbol; OrderFall++;
if ( p ) { pc=pc->suff(); goto LOOP_ENTRY; }
for ( ; ; ) {
if ( !pc->iSuffix ) return Ptr2Indx(pc);
pc=pc->suff();
if ( pc->NumStats ) {
if ((p=pc->getStats())->Symbol != sym)
do { tmp=p[1].Symbol; p++; } while (tmp != sym);
tmp=2*(p->Freq < MAX_FREQ-3);
p->Freq += tmp; pc->SummFreq += tmp;
} else { p=&(pc->oneState()); p->Freq += (p->Freq < 11); }
LOOP_ENTRY:
if ( p->iSuccessor ) break;
p->iSuccessor=iUpBranch; OrderFall++;
}
if (p->iSuccessor <= iUpBranch) {
p1=FoundState; FoundState=p;
p->iSuccessor=CreateSuccessors(FALSE,NULL,pc);
FoundState=p1;
}
if (OrderFall == 1 && pc1 == MaxContext) {
FoundState->iSuccessor=p->iSuccessor;
pText--;
}
return p->iSuccessor;
}
void PPM_CONTEXT::rescale()
{
UINT f0, sf, EscFreq, a=(OrderFall != 0), i=NumStats;
STATE tmp, * p1, * p; Flags &= 0x14;
for (p=FoundState;p != getStats();p--) SWAP(p[0],p[-1]);
f0=p->Freq; sf=SummFreq;
EscFreq=SummFreq-p->Freq; SummFreq=p->Freq=(p->Freq+a) >> 1;
do {
EscFreq -= (++p)->Freq;
SummFreq += (p->Freq=(p->Freq+a) >> 1);
if ( p->Freq ) Flags |= 0x08*(p->Symbol >= 0x40);
if (p[0].Freq > p[-1].Freq) {
StateCpy(tmp,*(p1=p));
do { StateCpy(p1[0],p1[-1]); } while (tmp.Freq > (--p1)[-1].Freq);
StateCpy(*p1,tmp);
}
} while ( --i );
if (p->Freq == 0) {
do { i++; } while ((--p)->Freq == 0);
EscFreq += i; a=(NumStats+2) >> 1;
if ((NumStats -= i) == 0) {
StateCpy(tmp,*getStats()); Flags &= 0x18;
tmp.Freq=(2*tmp.Freq+EscFreq-1)/EscFreq;
if (tmp.Freq > MAX_FREQ/3) tmp.Freq=MAX_FREQ/3;
FreeUnits(getStats(),a); StateCpy(oneState(),tmp);
FoundState=&oneState(); return;
}
iStats = Ptr2Indx(ShrinkUnits(getStats(),a,(NumStats+2) >> 1));
}
SummFreq += (EscFreq+1) >> 1;
if (OrderFall || (Flags & 0x04) == 0) {
a=(sf -= EscFreq)-f0;
a=CLAMP(UINT((f0*SummFreq-sf*getStats()->Freq+a-1)/a),2U,MAX_FREQ/2U-18U);
} else a=2;
(FoundState=getStats())->Freq += a; SummFreq += a;
Flags |= 0x04;
}
static _DWORD _FASTCALL CreateSuccessors(BOOL Skip,PPM_CONTEXT::STATE* p,PPM_CONTEXT* pc)
{
PPM_CONTEXT ct;
_DWORD iUpBranch = FoundState->iSuccessor;
PPM_CONTEXT::STATE* ps[MAX_O], ** pps=ps;
UINT cf, s0;
BYTE tmp, sym=FoundState->Symbol;
if ( !Skip ) {
*pps++ = FoundState;
if ( !pc->iSuffix ) goto NO_LOOP;
}
if ( p ) { pc=pc->suff(); goto LOOP_ENTRY; }
do {
pc=pc->suff();
if ( pc->NumStats ) {
if ((p=pc->getStats())->Symbol != sym)
do { tmp=p[1].Symbol; p++; } while (tmp != sym);
tmp=(p->Freq < MAX_FREQ);
p->Freq += tmp; pc->SummFreq += tmp;
} else {
p=&(pc->oneState());
p->Freq += (!pc->suff()->NumStats & (p->Freq < 11));
}
LOOP_ENTRY:
if (p->iSuccessor != iUpBranch) {
pc=p->getSucc(); break;
}
*pps++ = p;
} while ( pc->iSuffix );
NO_LOOP:
if (pps == ps) return Ptr2Indx(pc);
ct.NumStats=0; ct.Flags=0x10*(sym >= 0x40);
ct.oneState().Symbol=sym=*(_BYTE*)Indx2Ptr(iUpBranch);
ct.oneState().iSuccessor=Ptr2Indx((_BYTE*)Indx2Ptr(iUpBranch)+1);
ct.Flags |= 0x08*(sym >= 0x40);
if ( pc->NumStats ) {
if ((p=pc->getStats())->Symbol != sym)
do { tmp=p[1].Symbol; p++; } while (tmp != sym);
s0=pc->SummFreq-pc->NumStats-(cf=p->Freq-1);
cf=1+((2*cf <= s0)?(12*cf > s0):((cf+2*s0)/s0));
ct.oneState().Freq=(cf < 7)?(cf):(7);
} else
ct.oneState().Freq=pc->oneState().Freq;
do {
PPM_CONTEXT* pc1 = (PPM_CONTEXT*)AllocContext();
if ( !pc1 ) return 0;
((DWORD*)pc1)[0]=((DWORD*)&ct)[0]; ((DWORD*)pc1)[1]=((DWORD*)&ct)[1];
#if defined(_32_EXOTIC) || defined(_64_EXOTIC)
((DWORD*)pc1)[2]=((DWORD*)&ct)[2]; ((DWORD*)pc1)[3]=((DWORD*)&ct)[3];
#endif /* defined(_32_EXOTIC) || defined(_64_EXOTIC) */
pc1->iSuffix=Ptr2Indx(pc);
(*--pps)->iSuccessor=Ptr2Indx(pc=pc1);
} while (pps != ps);
return Ptr2Indx(pc);
}
// Tabulated escapes for exponential symbol distribution
static const BYTE ExpEscape[16]={51,43,18,12,11,9,8,7,6,5,4,3,3,2,2,2};
static void _FASTCALL UpdateModel(PPM_CONTEXT* MinContext)
{
BYTE Flag, sym, FSymbol=FoundState->Symbol;
UINT ns1, ns, cf, sf, s0, FFreq=FoundState->Freq;
_DWORD iSuccessor, iFSuccessor=FoundState->iSuccessor;
PPM_CONTEXT* pc;
PPM_CONTEXT::STATE* p=NULL;
if ( MinContext->iSuffix ) {
pc=MinContext->suff();
if ( pc->NumStats ) {
if ((p=pc->getStats())->Symbol != FSymbol) {
do { sym=p[1].Symbol; p++; } while (sym != FSymbol);
if (p[0].Freq >= p[-1].Freq) {
SWAP(p[0],p[-1]); p--;
}
}
if (p->Freq < MAX_FREQ) {
cf=1+(FFreq < 4*8);
p->Freq += cf; pc->SummFreq += cf;
}
} else { p=&(pc->oneState()); p->Freq += (p->Freq < 11); }
}
pc=MaxContext;
if (!OrderFall && iFSuccessor) {
FoundState->iSuccessor=CreateSuccessors(TRUE,p,MinContext);
if ( !FoundState->iSuccessor ) goto RESTART_MODEL;
MaxContext=FoundState->getSucc(); return;
}
*pText++ = FSymbol; iSuccessor = Ptr2Indx(pText);
if (pText >= UnitsStart) goto RESTART_MODEL;
if ( iFSuccessor ) {
if ((_BYTE*)Indx2Ptr(iFSuccessor) < UnitsStart)
iFSuccessor=CreateSuccessors(FALSE,p,MinContext);
else PrefetchData(Indx2Ptr(iFSuccessor));
} else
iFSuccessor=ReduceOrder(p,MinContext);
if ( !iFSuccessor ) goto RESTART_MODEL;
if ( !--OrderFall ) {
iSuccessor=iFSuccessor; pText -= (MaxContext != MinContext);
}
s0=MinContext->SummFreq-FFreq; ns=MinContext->NumStats;
Flag=0x08*(FSymbol >= 0x40);
for ( ;pc != MinContext;pc=pc->suff()) {
if ((ns1=pc->NumStats) != 0) {
if ((ns1 & 1) != 0) {
p=(PPM_CONTEXT::STATE*)ExpandUnits(pc->getStats(),(ns1+1) >> 1);
if ( !p ) goto RESTART_MODEL;
pc->iStats=Ptr2Indx(p);
}
pc->SummFreq += QTable[ns+4] >> 3;
} else {
p=(PPM_CONTEXT::STATE*)AllocUnits(1);
if ( !p ) goto RESTART_MODEL;
StateCpy(*p,pc->oneState()); pc->iStats=Ptr2Indx(p);
p->Freq=(p->Freq <= MAX_FREQ/3)?(2*p->Freq-1):(MAX_FREQ-15);
pc->SummFreq=p->Freq+(ns > 1)+ExpEscape[QTable[BSumm >> 8]];
}
cf=2*FFreq*(pc->SummFreq+4); sf=s0+pc->SummFreq;
if (cf <= 6*sf) {
cf=1+(cf > sf)+(cf > 3*sf); pc->SummFreq += 4;
} else
pc->SummFreq += (cf=4+(cf > 8*sf)+(cf > 10*sf)+(cf > 13*sf));
p=pc->getStats()+(++pc->NumStats); p->iSuccessor=iSuccessor;
p->Symbol = FSymbol; p->Freq = cf;
pc->Flags |= Flag;
}
MaxContext = (PPM_CONTEXT*)Indx2Ptr(iFSuccessor);
return;
RESTART_MODEL:
RestoreModelRare(pc);
}
#define GET_MEAN(SUMM,SHIFT) ((SUMM+ROUND) >> SHIFT)
inline void PPM_CONTEXT::encodeBinSymbol(int symbol)
{
STATE& rs=oneState();
WORD& bs=BinSumm[QTable[rs.Freq-1]][NS2BSIndx[suff()->NumStats]+PrevSuccess+
Flags+((RunLength >> 26) & 0x20)];
UINT tmp=rcBinStart(BSumm=bs,TOT_BITS); bs -= GET_MEAN(BSumm,PERIOD_BITS);
if (rs.Symbol == symbol) {
bs += INTERVAL; rcBinCorrect0(tmp);
FoundState=&rs; rs.Freq += (rs.Freq < 196);
RunLength++; PrevSuccess=1;
} else {
rcBinCorrect1(tmp,BIN_SCALE-BSumm); CharMask[rs.Symbol]=EscCount;
NumMasked=PrevSuccess=0; FoundState=NULL;
}
}
inline void PPM_CONTEXT::decodeBinSymbol()
{
STATE& rs=oneState();
WORD& bs=BinSumm[QTable[rs.Freq-1]][NS2BSIndx[suff()->NumStats]+PrevSuccess+
Flags+((RunLength >> 26) & 0x20)];
UINT tmp=rcBinStart(BSumm=bs,TOT_BITS); bs -= GET_MEAN(BSumm,PERIOD_BITS);
if ( !rcBinDecode(tmp) ) {
bs += INTERVAL; rcBinCorrect0(tmp);
FoundState=&rs; rs.Freq += (rs.Freq < 196);
RunLength++; PrevSuccess=1;
} else {
rcBinCorrect1(tmp,BIN_SCALE-BSumm); CharMask[rs.Symbol]=EscCount;
NumMasked=PrevSuccess=0; FoundState=NULL;
}
}
inline void PPM_CONTEXT::update1(STATE* p)
{
(FoundState=p)->Freq += 4; SummFreq += 4;
if (p[0].Freq > p[-1].Freq) {
SWAP(p[0],p[-1]); FoundState=--p;
if (p->Freq > MAX_FREQ) rescale();
}
}
inline void PPM_CONTEXT::encodeSymbol1(int symbol)
{
STATE* p=getStats();
UINT i=p->Symbol, LoCnt=p->Freq; Range.scale=SummFreq;
if (i == symbol) {
PrevSuccess=(2*(Range.high=LoCnt) > Range.scale);
(FoundState=p)->Freq=(LoCnt += 4); SummFreq += 4;
if (LoCnt > MAX_FREQ) rescale();
Range.low=0; return;
}
PrefetchData(p+(i=NumStats)); PrevSuccess=0;
while ((++p)->Symbol != symbol) {
LoCnt += p->Freq;
if (--i == 0) {
if ( iSuffix ) PrefetchData(suff());
Range.low=LoCnt; CharMask[p->Symbol]=EscCount;
i=NumMasked=NumStats; FoundState=NULL;
do { CharMask[(--p)->Symbol]=EscCount; } while ( --i );
Range.high=Range.scale; return;
}
}
Range.high=(Range.low=LoCnt)+p->Freq; update1(p);
}
inline void PPM_CONTEXT::decodeSymbol1()
{
STATE* p=getStats();
UINT i, count, HiCnt=p->Freq; Range.scale=SummFreq;
if ((count=rcGetCurrentCount()) < HiCnt) {
PrevSuccess=(2*(Range.high=HiCnt) > Range.scale);
(FoundState=p)->Freq=(HiCnt += 4); SummFreq += 4;
if (HiCnt > MAX_FREQ) rescale();
Range.low=0; return;
}
PrefetchData(p+(i=NumStats)); PrevSuccess=0;
while ((HiCnt += (++p)->Freq) <= count)
if (--i == 0) {
if ( iSuffix ) PrefetchData(suff());
Range.low=HiCnt; CharMask[p->Symbol]=EscCount;
i=NumMasked=NumStats; FoundState=NULL;
do { CharMask[(--p)->Symbol]=EscCount; } while ( --i );
Range.high=Range.scale; return;
}
Range.low=(Range.high=HiCnt)-p->Freq; update1(p);
}
inline void PPM_CONTEXT::update2(STATE* p)
{
(FoundState=p)->Freq += 4; SummFreq += 4;
if (p->Freq > MAX_FREQ) rescale();
EscCount++; RunLength=InitRL;
}
inline SEE2_CONTEXT* PPM_CONTEXT::makeEscFreq2()
{
SEE2_CONTEXT* psee2c; PrefetchData(getStats());
if (NumStats != 0xFF) {
psee2c=SEE2Cont[QTable[NumStats+3]-4]+(SummFreq > 10*(NumStats+1))+
2*(2*NumStats < suff()->NumStats+NumMasked)+Flags;
Range.scale=psee2c->getMean();
} else { psee2c=&DummySEE2Cont; Range.scale=1; }
PrefetchData(getStats()+NumStats); return psee2c;
}
inline void PPM_CONTEXT::encodeSymbol2(int symbol)
{
SEE2_CONTEXT* psee2c=makeEscFreq2();
UINT Sym, LoCnt=0, i=NumStats-NumMasked;
STATE* p1, * p=getStats()-1;
do {
do { Sym=p[1].Symbol; p++; } while (CharMask[Sym] == EscCount);
CharMask[Sym]=EscCount;
if (Sym == symbol) goto SYMBOL_FOUND;
LoCnt += p->Freq;
} while ( --i );
Range.high=(Range.scale += (Range.low=LoCnt));
psee2c->Summ += Range.scale; NumMasked = NumStats;
return;
SYMBOL_FOUND:
Range.low=LoCnt; Range.high=(LoCnt += p->Freq);
for (p1=p; --i ; ) {
do { Sym=p1[1].Symbol; p1++; } while (CharMask[Sym] == EscCount);
LoCnt += p1->Freq;
}
Range.scale += LoCnt;
psee2c->update(); update2(p);
}
inline void PPM_CONTEXT::decodeSymbol2()
{
SEE2_CONTEXT* psee2c=makeEscFreq2();
UINT Sym, count, HiCnt=0, i=NumStats-NumMasked;
STATE* ps[256], ** pps=ps, * p=getStats()-1;
do {
do { Sym=p[1].Symbol; p++; } while (CharMask[Sym] == EscCount);
HiCnt += p->Freq; *pps++ = p;
} while ( --i );
Range.scale += HiCnt; count=rcGetCurrentCount();
p=*(pps=ps);
if (count < HiCnt) {
HiCnt=0;
while ((HiCnt += p->Freq) <= count) p=*++pps;
Range.low = (Range.high=HiCnt)-p->Freq;
psee2c->update(); update2(p);
} else {
Range.low=HiCnt; Range.high=Range.scale;
i=NumStats-NumMasked; NumMasked = NumStats;
do { CharMask[(*pps)->Symbol]=EscCount; pps++; } while ( --i );
psee2c->Summ += Range.scale;
}
}
inline void ClearMask(_PPMD_FILE* EncodedFile,_PPMD_FILE* DecodedFile)
{
EscCount=1; memset(CharMask,0,sizeof(CharMask));
if (++PrintCount == 0) PrintInfo(DecodedFile,EncodedFile);
}
void _STDCALL EncodeFile(_PPMD_FILE* EncodedFile,_PPMD_FILE* DecodedFile,
int MaxOrder,BOOL CutOff)
{
rcInitEncoder(); StartModelRare(MaxOrder,CutOff);
for (PPM_CONTEXT* MinContext=MaxContext; ; ) {
int c = _PPMD_E_GETC(DecodedFile);
if ( MinContext->NumStats ) {
MinContext->encodeSymbol1(c); rcEncodeSymbol();
} else MinContext->encodeBinSymbol(c);
while ( !FoundState ) {
RC_ENC_NORMALIZE(EncodedFile);
do {
if ( !MinContext->iSuffix ) goto STOP_ENCODING;
OrderFall++; MinContext=MinContext->suff();
} while (MinContext->NumStats == NumMasked);
MinContext->encodeSymbol2(c); rcEncodeSymbol();
}
if (!OrderFall && (_BYTE*)FoundState->getSucc() >= UnitsStart)
PrefetchData(MaxContext=FoundState->getSucc());
else {
UpdateModel(MinContext);
if (EscCount == 0) ClearMask(EncodedFile,DecodedFile);
}
RC_ENC_NORMALIZE(EncodedFile); MinContext=MaxContext;
}
STOP_ENCODING:
rcFlushEncoder(EncodedFile); PrintInfo(DecodedFile,EncodedFile);
}
void _STDCALL DecodeFile(_PPMD_FILE* DecodedFile,_PPMD_FILE* EncodedFile,
int MaxOrder,BOOL CutOff)
{
rcInitDecoder(EncodedFile); StartModelRare(MaxOrder,CutOff);
for (PPM_CONTEXT* MinContext=MaxContext; ; ) {
if ( MinContext->NumStats ) {
MinContext->decodeSymbol1(); rcRemoveSubrange();
} else MinContext->decodeBinSymbol();
while ( !FoundState ) {
RC_DEC_NORMALIZE(EncodedFile);
do {
if ( !MinContext->iSuffix ) goto STOP_DECODING;
OrderFall++; MinContext=MinContext->suff();
} while (MinContext->NumStats == NumMasked);
MinContext->decodeSymbol2(); rcRemoveSubrange();
}
_PPMD_D_PUTC(FoundState->Symbol,DecodedFile);
if (!OrderFall && (_BYTE*)FoundState->getSucc() >= UnitsStart)
PrefetchData(MaxContext=FoundState->getSucc());
else {
UpdateModel(MinContext);
if (EscCount == 0) ClearMask(EncodedFile,DecodedFile);
}
RC_DEC_NORMALIZE(EncodedFile); MinContext=MaxContext;
}
STOP_DECODING:
PrintInfo(DecodedFile,EncodedFile);
}
#if !defined(NDEBUG)
#pragma option -w-ccc -w-rch
BOOL TestCompilation()
{
/***************** testing on proper sizes of data types ******************/
if (2*sizeof(_BYTE) != sizeof(_WORD) || 12*sizeof(_BYTE) != sizeof(PPM_CONTEXT))
return FALSE;
/************* testing on proper alignment of our data types **************/
PPM_CONTEXT tmp;
if (2*sizeof(PPM_CONTEXT::STATE) != sizeof(PPM_CONTEXT) || &tmp.iSuffix != (_DWORD*)(&tmp.oneState()+1))
return FALSE;
return TRUE;
}
#endif /* !defined(NDEBUG) */
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