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mod_ppmd.inc
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//////////////////////////// ppmdModel //////////////////////////
#ifdef UNIX
#define NOINLINE __attribute__((__noinline__))
#else
#define NOINLINE __declspec(noinline)
#endif
template <class T> T Min( T x, T y ) { return (x<y) ? x : y; }
template <class T> T Max( T x, T y ) { return (x>y) ? x : y; }
#pragma pack(1)
typedef unsigned short word;
//typedef unsigned int uint;
//typedef unsigned char byte;
//typedef unsigned long long qword;
//--- #include "libpmd/model_def.inc"
//#pragma pack(1)
const int ORealMAX=256;
static signed char EscCoef[12] = { 16, -10, 1, 51, 14, 89, 23, 35, 64, 26, -42, 43 };
// Tabulated escapes for exponential symbol distribution
static const U8 ExpEscape[16]={ 51,43,18,12,11,9,8,7,6,5,4,3,3,2,2,2 };
struct ppmd_Model {
typedef unsigned short word;
enum{ SCALE=1<<15 };
enum{
UNIT_SIZE=12,
N1=4, N2=4, N3=4, N4=(128+3-1*N1-2*N2-3*N3)/4,
N_INDEXES=N1+N2+N3+N4
};
U8* HeapStart;
typedef U8* pbyte;
U32 Ptr2Indx( void* p ) { return pbyte(p)-HeapStart; }
void* Indx2Ptr(U32 indx) { return indx + HeapStart; }
/* U32 Ptr2Indx( void* p ) {
U64 addr = ((U8*)p)-HeapStart;
U32 lim = (UnitsStart-HeapStart);
U32 indx = (addr>=lim) ? (addr-lim)/UNIT_SIZE+lim : addr;
return indx;
}
void* Indx2Ptr( U32 indx ) {
U32 lim = (UnitsStart-HeapStart);
U64 addr = (indx>=lim) ? U64(indx-lim)*UNIT_SIZE+lim : indx;
return HeapStart + addr;
}*/
//--- #include "alloc_node.inc"
struct _MEM_BLK {
U32 Stamp;
U32 NextIndx;
U32 NU;
};
struct BLK_NODE {
U32 Stamp;
U32 NextIndx;
int avail() const { return (NextIndx!=0); }
};
BLK_NODE* getNext( BLK_NODE* This ) {
return (BLK_NODE*)Indx2Ptr(This->NextIndx);
}
void setNext( BLK_NODE* This, BLK_NODE* p ) {
This->NextIndx = Ptr2Indx(p);
}
void link( BLK_NODE* This, BLK_NODE* p ) {
p->NextIndx = This->NextIndx;
setNext( This, p );
}
void unlink( BLK_NODE* This ) {
This->NextIndx = getNext(This)->NextIndx;
}
void* remove( BLK_NODE* This ) {
BLK_NODE* p = getNext(This);
unlink(This);
This->Stamp--;
return p;
}
void insert( BLK_NODE* This, void* pv, int NU ) {
BLK_NODE* p = (BLK_NODE*)pv;
link(This,p);
p->Stamp = ~U32(0);
((_MEM_BLK&)*p).NU = NU;
This->Stamp++;
}
struct MEM_BLK : public BLK_NODE {
U32 NU;
};
typedef BLK_NODE* pBLK_NODE;
typedef MEM_BLK* pMEM_BLK;
BLK_NODE BList[N_INDEXES+1];
U32 GlueCount;
U32 GlueCount1;
U64 SubAllocatorSize;
U8* pText;
U8* UnitsStart;
U8* LoUnit;
U8* HiUnit;
U8* AuxUnit;
//--- #include "alloc_units.inc"
U32 U2B( U32 NU ) {
return 8*NU+4*NU;
}
int StartSubAllocator( U64 SASize ) {
U64 t = SASize << 20U;
HeapStart = new U8[t];
programChecker.alloc(t);
// HeapStart = mAlloc<U8>(t);
// HeapStart = (U8*)VirtualAlloc( 0, t, MEM_COMMIT, PAGE_READWRITE );
if( HeapStart==NULL ) return 0;
SubAllocatorSize = t;
return 1;
}
void InitSubAllocator() {
memset( BList, 0, sizeof(BList) );
HiUnit = (pText=HeapStart) + SubAllocatorSize;
U64 Diff = SubAllocatorSize/8/UNIT_SIZE*7 *UNIT_SIZE ; //U2B(SubAllocatorSize/8/UNIT_SIZE*7);
LoUnit = UnitsStart = HiUnit-Diff;
GlueCount=GlueCount1=0;
//printf( "HeapStart=%I64X\n", HeapStart );
//printf( "UnitsStart=%I64X\n", UnitsStart-HeapStart );
//printf( "SubAllocatorSize=%I64X\n", SubAllocatorSize );
}
U64 GetUsedMemory() {
int i;
U64 RetVal = SubAllocatorSize - (HiUnit-LoUnit) - (UnitsStart-pText);
for( i=0; i<N_INDEXES; i++ ) {
// RetVal -= U2B( Indx2Units[i]*BList[i].Stamp );
RetVal -= U64(Indx2Units[i]*BList[i].Stamp)*12;
}
return RetVal;
}
void StopSubAllocator() {
if( SubAllocatorSize ) SubAllocatorSize=0, delete HeapStart;
// if( SubAllocatorSize ) SubAllocatorSize=0, VirtualFree(HeapStart, 0, MEM_RELEASE);
}
//----------------------------------------
void GlueFreeBlocks() {
U32 i, k, sz;
MEM_BLK s0;
pMEM_BLK p, p0=&s0, p1;
if( LoUnit!=HiUnit ) LoUnit[0]=0;
for( p0->NextIndx=0,i=0; i<=N_INDEXES; i++ ) {
while( BList[i].avail() ) {
p = (MEM_BLK*)remove(&BList[i]);
if( p->NU ) {
while( p1 = p + p->NU, p1->Stamp==~U32(0) ) {
p->NU += p1->NU;
p1->NU = 0;
}
link(p0,p); p0=p;
}
}
}
while( s0.avail() ) {
p = (MEM_BLK*)remove(&s0);
sz= p->NU;
if( sz ) {
for(; sz>128; sz-=128, p+=128 ) insert(&BList[N_INDEXES-1],p,128);
i = Units2Indx[sz-1];
if( Indx2Units[i] != sz ) {
k = sz - Indx2Units[--i];
insert( &BList[k-1], p+(sz-k) , k );
}
insert( &BList[i], p, Indx2Units[i] );
}
}
GlueCount = 1 << (13+GlueCount1++);
}
void SplitBlock( void* pv, U32 OldIndx, U32 NewIndx ) {
U32 i, k, UDiff=Indx2Units[OldIndx]-Indx2Units[NewIndx];
U8* p = ((U8*)pv)+U2B(Indx2Units[NewIndx]);
i = Units2Indx[UDiff-1];
if( Indx2Units[i]!=UDiff ) {
k=Indx2Units[--i];
insert(&BList[i],p,k);
p += U2B(k);
UDiff -= k;
}
insert( &BList[Units2Indx[UDiff-1]], p, UDiff );
}
void* AllocUnitsRare( U32 indx ) {
U32 i = indx;
do {
if( ++i == N_INDEXES ) {
if( !GlueCount-- ) {
GlueFreeBlocks();
if( BList[i=indx].avail() ) return remove(&BList[i]);
} else {
i = U2B(Indx2Units[indx]);
return (UnitsStart-pText>i) ? UnitsStart-=i : NULL;
}
}
} while( !BList[i].avail() );
void* RetVal=remove(&BList[i]);
SplitBlock( RetVal, i, indx );
return RetVal;
}
void* AllocUnits( U32 NU ) {
U32 indx = Units2Indx[NU-1];
if( BList[indx].avail() ) return remove(&BList[indx]);
void* RetVal=LoUnit;
LoUnit += U2B(Indx2Units[indx]);
if( LoUnit<=HiUnit ) return RetVal;
LoUnit -= U2B(Indx2Units[indx]);
return AllocUnitsRare(indx);
}
void* AllocContext() {
if( HiUnit!=LoUnit ) return HiUnit-=UNIT_SIZE;
return BList->avail() ? remove(BList) : AllocUnitsRare(0);
}
void FreeUnits( void* ptr, U32 NU ) {
U32 indx = Units2Indx[NU-1];
insert( &BList[indx], ptr, Indx2Units[indx] );
}
void FreeUnit( void* ptr ) {
int i = (U8*)ptr > UnitsStart+128*1024 ? 0 : N_INDEXES;
insert( &BList[i], ptr, 1 );
}
//----------------------------------------
void UnitsCpy( void* Dest, void* Src, U32 NU ) {
memcpy( Dest, Src, 12*NU );
}
void* ExpandUnits( void* OldPtr, U32 OldNU ) {
U32 i0 = Units2Indx[OldNU-1];
U32 i1 = Units2Indx[OldNU-1+1];
if( i0==i1 ) return OldPtr;
void* ptr = AllocUnits(OldNU+1);
if( ptr ) {
UnitsCpy( ptr, OldPtr, OldNU );
insert( &BList[i0], OldPtr, OldNU );
}
return ptr;
}
void* ShrinkUnits( void* OldPtr, U32 OldNU, U32 NewNU ) {
U32 i0 = Units2Indx[OldNU-1];
U32 i1 = Units2Indx[NewNU-1];
if( i0==i1 ) return OldPtr;
if( BList[i1].avail() ) {
void* ptr = remove(&BList[i1]);
UnitsCpy( ptr, OldPtr, NewNU );
insert( &BList[i0], OldPtr, Indx2Units[i0] );
return ptr;
} else {
SplitBlock(OldPtr,i0,i1);
return OldPtr;
}
}
void* MoveUnitsUp( void* OldPtr, U32 NU ) {
U32 indx = Units2Indx[NU-1];
// PrefetchData(OldPtr);
if( (U8*)OldPtr > UnitsStart+128*1024 ||
(BLK_NODE*)OldPtr > getNext(&BList[indx]) ) return OldPtr;
void* ptr = remove(&BList[indx]);
UnitsCpy( ptr, OldPtr, NU );
insert( &BList[N_INDEXES], OldPtr, Indx2Units[indx] );
return ptr;
}
void PrepareTextArea() {
AuxUnit = (U8*)AllocContext();
if( !AuxUnit ) {
AuxUnit = UnitsStart;
} else {
if( AuxUnit==UnitsStart) AuxUnit = (UnitsStart+=UNIT_SIZE);
}
}
void ExpandTextArea() {
BLK_NODE* p;
U32 Count[N_INDEXES], i=0;
memset( Count, 0, sizeof(Count) );
if( AuxUnit!=UnitsStart ) {
if( *(U32*)AuxUnit != ~U32(0) )
UnitsStart += UNIT_SIZE;
else
insert( BList, AuxUnit, 1 );
}
while( (p=(BLK_NODE*)UnitsStart)->Stamp == ~U32(0) ) {
MEM_BLK* pm = (MEM_BLK*)p;
UnitsStart = (U8*)(pm + pm->NU);
Count[Units2Indx[pm->NU-1]]++;
i++;
pm->Stamp = 0;
}
if( i ) {
for( p=BList+N_INDEXES; p->NextIndx; p=getNext(p) ) {
while( p->NextIndx && !getNext(p)->Stamp ) {
Count[Units2Indx[((MEM_BLK*)getNext(p))->NU-1]]--;
unlink(p);
BList[N_INDEXES].Stamp--;
}
if( !p->NextIndx ) break;
}
for( i=0; i<N_INDEXES; i++ ) {
for( p=BList+i; Count[i]!=0; p=getNext(p) ) {
while( !getNext(p)->Stamp ) {
unlink(p); BList[i].Stamp--;
if ( !--Count[i] ) break;
}
}
}
}
}
//--- #include "ppmd_init.inc"
static const int MAX_O=ORealMAX; // maximum allowed model order
//enum { FALSE=0,TRUE=1 };
template <class T>
T CLAMP( const T& X, const T& LoX, const T& HiX ) { return (X >= LoX)?((X <= HiX)?(X):(HiX)):(LoX); }
template <class T>
void SWAP( T& t1, T& t2 ) { T tmp=t1; t1=t2; t2=tmp; }
// void PrefetchData(void* Addr) {
//U8 Prefetchbyte = *(volatile U8*)Addr;
// }
enum {
UP_FREQ = 5
};
U8 Indx2Units[N_INDEXES];
U8 Units2Indx[128]; // constants
U8 NS2BSIndx[256];
U8 QTable[260];
// constants initialization
void PPMD_STARTUP( void ) {
int 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=0,i=0; k<128; k++ ) {
i += Indx2Units[i]<k+1;
Units2Indx[k]=i;
}
NS2BSIndx[0] = 2*0; //-V525
NS2BSIndx[1] = 2*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++;
}
}
//--- #include "mod_context.inc"
enum {
MAX_FREQ = 124,
O_BOUND = 9
};
struct PPM_CONTEXT;
struct STATE {
U8 Symbol;
U8 Freq;
U32 iSuccessor;
};
PPM_CONTEXT* getSucc( STATE* This ) {
return (PPM_CONTEXT*)Indx2Ptr( This->iSuccessor );
}
void SWAP( STATE& s1, STATE& s2 ) {
word t1 = (word&)s1;
U32 t2 = s1.iSuccessor;
(word&)s1 = (word&)s2;
s1.iSuccessor = s2.iSuccessor;
(word&)s2 = t1;
s2.iSuccessor = t2;
}
struct PPM_CONTEXT {
U8 NumStats;
U8 Flags;
word SummFreq;
U32 iStats;
U32 iSuffix;
STATE& oneState() const { return (STATE&) SummFreq; }
};
STATE* getStats( PPM_CONTEXT* This ) { return (STATE*)Indx2Ptr(This->iStats); }
PPM_CONTEXT* suff( PPM_CONTEXT* This ) { return (PPM_CONTEXT*)Indx2Ptr(This->iSuffix); }
int _MaxOrder, _CutOff, _MMAX;
U32 _filesize;
int OrderFall;
STATE* FoundState; // found next state transition
PPM_CONTEXT* MaxContext;
U32 EscCount;
U32 CharMask[256];
int BSumm;
int RunLength;
int InitRL;
//--- #include "mod_see.inc"
enum {
INT_BITS = 7,
PERIOD_BITS = 7,
TOT_BITS = INT_BITS + PERIOD_BITS,
INTERVAL = 1 << INT_BITS,
BIN_SCALE = 1 << TOT_BITS,
ROUND = 16
};
// SEE-contexts for PPM-contexts with masked symbols
struct SEE2_CONTEXT {
word Summ;
U8 Shift;
U8 Count;
void init( U32 InitVal ) {
Shift = PERIOD_BITS-4;
Summ = InitVal << Shift;
Count = 7;
}
U32 getMean() {
return Summ >> Shift;
}
void update() {
if( --Count==0 ) setShift_rare();
}
void setShift_rare() {
U32 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 = 5 << Shift;
}
};
int NumMasked;
//--- #include "mod_rescale.inc"
STATE* rescale( PPM_CONTEXT& q, int OrderFall, STATE* FoundState ) {
STATE tmp; STATE* p; STATE* p1;
q.Flags &= 0x14;
// move the current node to rank0
p1 = getStats(&q);
tmp = FoundState[0];
for( p=FoundState; p!=p1; p-- ) p[0]=p[-1];
p1[0] = tmp;
int of = (OrderFall != 0);
int a, i;
int f0 = p->Freq;
int sf = q.SummFreq;
int EscFreq = sf-f0;
q.SummFreq = p->Freq = (f0+of)>>1;
// sort symbols by freqs
for( i=0; i<q.NumStats; i++ ) {
p++;
a = p->Freq;
EscFreq -= a;
a = (a+of)>>1;
p->Freq = a;
q.SummFreq += a;
if( a ) q.Flags |= 0x08*(p->Symbol>=0x40);
if( a > p[-1].Freq ) {
tmp = p[0];
for( p1=p; tmp.Freq>p1[-1].Freq; p1-- ) p1[0]=p1[-1];
p1[0] = tmp;
}
}
// remove the zero freq nodes
if( p->Freq==0 ) {
for( i=0; p->Freq==0; i++,p-- );
EscFreq += i;
a = (q.NumStats+2) >> 1;
if( (q.NumStats-=i)==0 ) {
tmp = getStats(&q)[0];
tmp.Freq = Min( MAX_FREQ/3, (2*tmp.Freq+EscFreq-1)/EscFreq );
q.Flags &= 0x18;
FreeUnits( getStats(&q), a );
q.oneState() = tmp;
FoundState = &q.oneState();
return FoundState;
}
q.iStats = Ptr2Indx( ShrinkUnits(getStats(&q),a,(q.NumStats+2)>>1) );
}
// some weird magic
q.SummFreq += (EscFreq+1) >> 1;
if( OrderFall || (q.Flags & 0x04)==0 ) {
a = (sf-=EscFreq) - f0;
a = CLAMP( U32( ( f0*q.SummFreq - sf*getStats(&q)->Freq + a-1 ) / a ), 2U, MAX_FREQ/2U-18U );
} else {
a = 2;
}
(FoundState=getStats(&q))->Freq += a;
q.SummFreq += a;
q.Flags |= 0x04;
return FoundState;
}
//--- #include "mod_cutoff.inc"
void AuxCutOff( STATE* p, int Order, int MaxOrder ) {
if( Order<MaxOrder ) {
//PrefetchData( getSucc(p) );
p->iSuccessor = cutOff( getSucc(p)[0], Order+1,MaxOrder);
} else {
p->iSuccessor=0;
}
}
U32 cutOff( PPM_CONTEXT& q, int Order, int MaxOrder ) {
int i, tmp, EscFreq, Scale;
STATE* p;
STATE* p0;
// for binary context, just cut off the successors
if( q.NumStats==0 ) {
int flag = 1;
p = &q.oneState();
if( (U8*)getSucc(p) >= UnitsStart ) {
AuxCutOff( p, Order, MaxOrder );
if( p->iSuccessor || Order<O_BOUND ) flag=0;
}
if( flag ) {
FreeUnit( &q );
return 0;
}
} else {
tmp = (q.NumStats+2)>>1;
p0 = (STATE*)MoveUnitsUp(getStats(&q),tmp);
q.iStats = Ptr2Indx(p0);
// cut the branches with links to text
for( i=q.NumStats, p=&p0[i]; p>=p0; p-- ) {
if( (U8*)getSucc(p) < UnitsStart ) {
p[0].iSuccessor=0;
SWAP( p[0], p0[i--] );
} else AuxCutOff( p, Order, MaxOrder );
}
// if something was cut
if( i!=q.NumStats && Order>0 ) {
q.NumStats = i;
p = p0;
if( i<0 ) {
FreeUnits( p, tmp );
FreeUnit( &q );
return 0;
}
if( i==0 ) {
q.Flags = (q.Flags & 0x10) + 0x08*(p[0].Symbol>=0x40);
p[0].Freq = 1+(2*(p[0].Freq-1))/(q.SummFreq-p[0].Freq);
q.oneState() = p[0];
FreeUnits( p, tmp );
} else {
p = (STATE*)ShrinkUnits( p0, tmp, (i+2)>>1 );
q.iStats = Ptr2Indx(p);
Scale = (q.SummFreq>16*i); // av.freq > 16
q.Flags = (q.Flags & (0x10+0x04*Scale));
if( Scale ) {
EscFreq = q.SummFreq;
q.SummFreq = 0;
for( i=0; i<=q.NumStats; i++ ) {
EscFreq -= p[i].Freq;
p[i].Freq = (p[i].Freq+1)>>1;
q.SummFreq += p[i].Freq;
q.Flags |= 0x08*(p[i].Symbol>=0x40);
};
EscFreq = (EscFreq+1)>>1;
q.SummFreq += EscFreq;
} else {
for( i=0; i<=q.NumStats; i++ ) q.Flags |= 0x08*(p[i].Symbol>=0x40);
}
}
}
}
if( (U8*)&q==UnitsStart ) {
// if this is a root, copy it
UnitsCpy( AuxUnit, &q, 1 );
return Ptr2Indx(AuxUnit);
} else {
// if suffix is root, switch the pointer
if( (U8*)suff(&q)==UnitsStart ) q.iSuffix=Ptr2Indx(AuxUnit);
}
return Ptr2Indx(&q);
}
//--- #include "ppmd_flush.inc"
NOINLINE
void StartModelRare( void ) {
int i, k, s;
U8 i2f[25];
memset( CharMask, 0, sizeof(CharMask) );
EscCount=1;
// we are in solid mode
if( _MaxOrder<2 ) {
OrderFall = _MaxOrder;
for( PPM_CONTEXT* pc=MaxContext; pc->iSuffix!=0; pc=suff(pc) ) OrderFall--;
return;
}
OrderFall = _MaxOrder;
InitSubAllocator();
InitRL = -( (_MaxOrder<13) ? _MaxOrder : 13 );
RunLength = InitRL;
// alloc and init order0 context
MaxContext = (PPM_CONTEXT*)AllocContext();
MaxContext->NumStats = 255;
MaxContext->SummFreq = 255+2;
MaxContext->iStats = Ptr2Indx(AllocUnits(256/2));
MaxContext->Flags = 0;
MaxContext->iSuffix = 0;
PrevSuccess = 0;
for( i=0; i<256; i++ ) {
getStats(MaxContext)[i].Symbol = i;
getStats(MaxContext)[i].Freq = 1;
getStats(MaxContext)[i].iSuccessor = 0;
}
// _InitSEE
if( 1 ) {
// a freq for quant?
for( k=i=0; i<25; i2f[i++]=k+1 ) while( QTable[k]==i ) k++;
// bin SEE init
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];
}
// masked SEE init
for( i=0; i<23; i++ ) for( k=0; k<32; k++ ) SEE2Cont[i][k].init(8*i+5);
}
}
// model flush
NOINLINE
void RestoreModelRare( void ) {
STATE* p;
pText = HeapStart;
PPM_CONTEXT* pc = saved_pc;
// from maxorder down, while there 2 symbols and 2nd symbol has a text pointer
for(;; MaxContext=suff(MaxContext) ) {
if( (MaxContext->NumStats==1) && (MaxContext!=pc) ) {
p = getStats(MaxContext);
if( (U8*)(getSucc(p+1))>=UnitsStart ) break;
} else break;
// turn a context with 2 symbols into a context with 1 symbol
MaxContext->Flags = (MaxContext->Flags & 0x10) + 0x08*(p->Symbol>=0x40);
p[0].Freq = (p[0].Freq+1) >> 1;
MaxContext->oneState() = p[0];
MaxContext->NumStats=0;
FreeUnits( p, 1 );
}
// go all the way down
while( MaxContext->iSuffix ) MaxContext=suff(MaxContext);
AuxUnit = UnitsStart;
ExpandTextArea();
// free up 25% of memory
do {
PrepareTextArea();
cutOff( MaxContext[0], 0, _MaxOrder ); // MaxContext is a tree root here, order0
ExpandTextArea();
} while( GetUsedMemory()>3*(SubAllocatorSize>>2) );
GlueCount = GlueCount1 = 0;
OrderFall = _MaxOrder;
}
//--- #include "ppmd_update.inc"
PPM_CONTEXT* saved_pc;
PPM_CONTEXT* UpdateModel( PPM_CONTEXT* MinContext ) {
U8 Flag, FSymbol;
U32 ns1, ns, cf, sf, s0, FFreq;
U32 iSuccessor, iFSuccessor;
PPM_CONTEXT* pc;
STATE* p = NULL;
FSymbol = FoundState->Symbol;
FFreq = FoundState->Freq;
iFSuccessor = FoundState->iSuccessor;
// partial update for the suffix context
if( MinContext->iSuffix ) {
pc = suff(MinContext);
// is it binary?
if( pc[0].NumStats ) {
p = getStats(pc);
if( p[0].Symbol!=FSymbol ) {
for( p++; p[0].Symbol!=FSymbol; p++ );
if( p[0].Freq >= p[-1].Freq ) SWAP( p[0], p[-1] ), p--;
}
if( p[0].Freq<MAX_FREQ-3 ) {
cf = 2 + (FFreq<28);
p[0].Freq += cf;
pc[0].SummFreq += cf;
}
} else {
p = &(pc[0].oneState());
p[0].Freq += (p[0].Freq<14);
}
}
pc = MaxContext;
// try increasing the order
if( !OrderFall && iFSuccessor ) {
FoundState->iSuccessor = CreateSuccessors( 1, p, MinContext );
if( !FoundState->iSuccessor ) { saved_pc=pc; return 0; };
MaxContext = getSucc(FoundState);
return MaxContext;
}
*pText++ = FSymbol;
iSuccessor = Ptr2Indx(pText);
if( pText>=UnitsStart ) { saved_pc=pc; return 0; };
if( iFSuccessor ) {
if( (U8*)Indx2Ptr(iFSuccessor) < UnitsStart )
iFSuccessor = CreateSuccessors( 0, p, MinContext );
//else
// PrefetchData( Indx2Ptr(iFSuccessor) );
} else
iFSuccessor = ReduceOrder( p, MinContext );
if( !iFSuccessor ) { saved_pc=pc; return 0; };
if( !--OrderFall ) {
iSuccessor = iFSuccessor;
pText -= (MaxContext!=MinContext);
}
s0 = MinContext->SummFreq - FFreq;
ns = MinContext->NumStats;
Flag = 0x08*(FSymbol>=0x40);
for( pc=MaxContext; pc!=MinContext; pc=suff(pc) ) {
ns1 = pc[0].NumStats;
// non-binary context?
if( ns1 ) {
// realloc table with alphabet size is odd
if( ns1&1 ) {
p = (STATE*)ExpandUnits( getStats(pc),(ns1+1)>>1 );
if( !p ) { saved_pc=pc; return 0; };
pc[0].iStats = Ptr2Indx(p);
}
// increase escape freq (more for larger alphabet)
pc[0].SummFreq += QTable[ns+4] >> 3;
} else {
// escaped binary context
p = (STATE*)AllocUnits(1);
if( !p ) { saved_pc=pc; return 0; };
p[0] = pc[0].oneState();
pc[0].iStats = Ptr2Indx(p);
p[0].Freq = (p[0].Freq<=MAX_FREQ/3) ? (2*p[0].Freq-1) : (MAX_FREQ-15);
// update escape
pc[0].SummFreq = p[0].Freq + (ns>1) + ExpEscape[QTable[BSumm>>8]]; //-V602
}
// inheritance
cf = (FFreq-1)*(5 + pc[0].SummFreq);
sf = s0 + pc[0].SummFreq;
// this is a weighted rescaling of symbol's freq into a new context (cf/sf)
if( cf<=3*sf ) {
// if the new freq is too small the we increase the escape freq too
cf = 1 + (2*cf>sf) + (2*cf>3*sf);
pc[0].SummFreq += 4;
} else {
cf = 5 + (cf>5*sf) + (cf>6*sf) + (cf>8*sf) + (cf>10*sf) + (cf>12*sf);
pc[0].SummFreq += cf;
}
p = getStats(pc) + (++pc[0].NumStats);
p[0].iSuccessor = iSuccessor;
p[0].Symbol = FSymbol;
p[0].Freq = cf;
pc[0].Flags |= Flag; // flag if last added symbol was >=0x40
}
MaxContext = (PPM_CONTEXT*)Indx2Ptr(iFSuccessor);
return MaxContext;
}
U32 CreateSuccessors( U32 Skip, STATE* p, PPM_CONTEXT* pc ) {
U8 tmp;
U32 cf, s0;
STATE* ps[MAX_O];
STATE** pps=ps;
U8 sym = FoundState->Symbol;
U32 iUpBranch = FoundState->iSuccessor;
if( !Skip ) {
*pps++ = FoundState;
if( !pc[0].iSuffix ) goto NO_LOOP;
}
if( p ) { pc = suff(pc); goto LOOP_ENTRY; }
do {
pc = suff(pc);
// increment current symbol's freq in lower order contexts
// more partial updates?
if( pc[0].NumStats ) {
// find sym node
for( p=getStats(pc); p[0].Symbol!=sym; p++ );
// increment freq if limit allows
tmp = 2*(p[0].Freq<MAX_FREQ-1);
p[0].Freq += tmp;
pc[0].SummFreq += tmp;
} else {
// binary context
p = &(pc[0].oneState());
p[0].Freq += (!suff(pc)->NumStats & (p[0].Freq<16));
}
LOOP_ENTRY:
if( p[0].iSuccessor!=iUpBranch ) {
pc = getSucc(p);
break;
}
*pps++ = p;
} while ( pc[0].iSuffix );
NO_LOOP:
if( pps==ps ) return Ptr2Indx(pc);
// fetch a following symbol from the text buffer
PPM_CONTEXT ct;
ct.NumStats = 0;
ct.Flags = 0x10*(sym>=0x40);
sym = *(U8*)Indx2Ptr(iUpBranch);
ct.oneState().iSuccessor = Ptr2Indx((U8*)Indx2Ptr(iUpBranch)+1);
ct.oneState().Symbol = sym;
ct.Flags |= 0x08*(sym>=0x40);
// pc is MinContext, the context used for encoding
if( pc[0].NumStats ) {
for( p=getStats(pc); p[0].Symbol!=sym; p++ );
cf = p[0].Freq - 1;
s0 = pc[0].SummFreq - pc[0].NumStats - cf;
cf = 1 + ((2*cf<s0) ? (12*cf>s0) : 2+cf/s0);
ct.oneState().Freq = Min<U32>( 7, cf );
} else {
ct.oneState().Freq = pc[0].oneState().Freq;
}
// attach the new node to all orders
do {
PPM_CONTEXT* pc1 = (PPM_CONTEXT*)AllocContext();
if( !pc1 ) return 0;
((U32*)pc1)[0] = ((U32*)&ct)[0];
((U32*)pc1)[1] = ((U32*)&ct)[1];
pc1->iSuffix = Ptr2Indx(pc);
pc = pc1; pps--;
pps[0][0].iSuccessor = Ptr2Indx(pc);
} while( pps!=ps );
return Ptr2Indx(pc);
}
U32 ReduceOrder( STATE* p, PPM_CONTEXT* pc ) {
U8 tmp;
STATE* p1;
PPM_CONTEXT* pc1=pc;
FoundState->iSuccessor = Ptr2Indx(pText);
U8 sym = FoundState->Symbol;
U32 iUpBranch = FoundState->iSuccessor;
OrderFall++;
if( p ) { pc=suff(pc); goto LOOP_ENTRY; }
while(1) {
if( !pc->iSuffix ) return Ptr2Indx(pc);
pc = suff(pc);
if( pc->NumStats ) {
for( p=getStats(pc); p[0].Symbol!=sym; p++ );
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(0,0,pc);
FoundState = p1;
}
if( OrderFall==1 && pc1==MaxContext ) {
FoundState->iSuccessor = p->iSuccessor;
pText--;
}
return p->iSuccessor;
}
//--- #include "ppmd_proc0.inc"
int PrevSuccess;
word BinSumm[25][64]; // binary SEE-contexts
template< int ProcMode >
void processBinSymbol( PPM_CONTEXT& q, int symbol ) {
STATE& rs = q.oneState();
int i = NS2BSIndx[suff(&q)->NumStats] + PrevSuccess + q.Flags + ((RunLength>>26) & 0x20);
word& bs = BinSumm[QTable[rs.Freq-1]][i];
BSumm = bs;
bs -= (BSumm+64) >> PERIOD_BITS;
int flag = ProcMode ? 0 : rs.Symbol!=symbol;
// rc_BProcess( BSumm+BSumm, flag );
if( flag ) {
CharMask[rs.Symbol] = EscCount;
NumMasked = 0;
PrevSuccess = 0;
FoundState = 0;
} else {
bs += INTERVAL;
rs.Freq += (rs.Freq<196);
RunLength++;
PrevSuccess = 1;
FoundState = &rs;
}
}
//--- #include "ppmd_proc1.inc"
// encode in unmasked (maxorder) context
template< int ProcMode >
void processSymbol1( PPM_CONTEXT& q, int symbol ) {
STATE* p = getStats(&q);
int cnum = q.NumStats;
int i = p[0].Symbol;
int low = 0;
int freq = p[0].Freq;
int total = q.SummFreq;
int flag;
// int mode;
int count=0;
// rc_Arrange( total );
if( ProcMode ) {
// count = rc_GetFreq( total );
flag = count<freq;
} else {
flag = i==symbol;
}
if( flag ) {
// mode = 2;