1 /* Ppmd7.c -- PPMdH codec
2 2010-03-12 : Igor Pavlov : Public domain
3 This code is based on PPMd var.H (2001): Dmitry Shkarin : Public domain */
5 #include "archive_platform.h"
9 #include "archive_ppmd7_private.h"
12 #define Ppmd7_GetPtr(p, ptr) (ptr)
13 #define Ppmd7_GetContext(p, ptr) (ptr)
14 #define Ppmd7_GetStats(p, ctx) ((ctx)->Stats)
16 #define Ppmd7_GetPtr(p, offs) ((void *)((p)->Base + (offs)))
17 #define Ppmd7_GetContext(p, offs) ((CPpmd7_Context *)Ppmd7_GetPtr((p), (offs)))
18 #define Ppmd7_GetStats(p, ctx) ((CPpmd_State *)Ppmd7_GetPtr((p), ((ctx)->Stats)))
21 #define Ppmd7_GetBinSumm(p) \
22 &p->BinSumm[Ppmd7Context_OneState(p->MinContext)->Freq - 1][p->PrevSuccess + \
23 p->NS2BSIndx[Ppmd7_GetContext(p, p->MinContext->Suffix)->NumStats - 1] + \
24 (p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol]) + \
25 2 * p->HB2Flag[Ppmd7Context_OneState(p->MinContext)->Symbol] + \
26 ((p->RunLength >> 26) & 0x20)]
28 #define kTopValue (1 << 24)
32 #define U2B(nu) ((UInt32)(nu) * UNIT_SIZE)
33 #define U2I(nu) (p->Units2Indx[(nu) - 1])
34 #define I2U(indx) (p->Indx2Units[indx])
37 #define REF(ptr) (ptr)
39 #define REF(ptr) ((UInt32)((Byte *)(ptr) - (p)->Base))
42 #define STATS_REF(ptr) ((CPpmd_State_Ref)REF(ptr))
44 #define CTX(ref) ((CPpmd7_Context *)Ppmd7_GetContext(p, ref))
45 #define STATS(ctx) Ppmd7_GetStats(p, ctx)
46 #define ONE_STATE(ctx) Ppmd7Context_OneState(ctx)
47 #define SUFFIX(ctx) CTX((ctx)->Suffix)
49 static const UInt16 kInitBinEsc[] = { 0x3CDD, 0x1F3F, 0x59BF, 0x48F3, 0x64A1, 0x5ABC, 0x6632, 0x6051};
50 static const Byte PPMD7_kExpEscape[16] = { 25, 14, 9, 7, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2 };
52 typedef CPpmd7_Context * CTX_PTR;
64 typedef struct CPpmd7_Node_
66 UInt16 Stamp; /* must be at offset 0 as CPpmd7_Context::NumStats. Stamp=0 means free */
68 CPpmd7_Node_Ref Next; /* must be at offset >= 4 */
73 #define NODE(ptr) (ptr)
75 #define NODE(offs) ((CPpmd7_Node *)(p->Base + (offs)))
78 static void Ppmd7_Update1(CPpmd7 *p);
79 static void Ppmd7_Update1_0(CPpmd7 *p);
80 static void Ppmd7_Update2(CPpmd7 *p);
81 static void Ppmd7_UpdateBin(CPpmd7 *p);
82 static CPpmd_See *Ppmd7_MakeEscFreq(CPpmd7 *p, unsigned numMasked,
85 /* ----------- Base ----------- */
87 static void Ppmd7_Construct(CPpmd7 *p)
93 for (i = 0, k = 0; i < PPMD_NUM_INDEXES; i++)
95 unsigned step = (i >= 12 ? 4 : (i >> 2) + 1);
96 do { p->Units2Indx[k++] = (Byte)i; } while(--step);
97 p->Indx2Units[i] = (Byte)k;
100 p->NS2BSIndx[0] = (0 << 1);
101 p->NS2BSIndx[1] = (1 << 1);
102 memset(p->NS2BSIndx + 2, (2 << 1), 9);
103 memset(p->NS2BSIndx + 11, (3 << 1), 256 - 11);
105 for (i = 0; i < 3; i++)
106 p->NS2Indx[i] = (Byte)i;
107 for (m = i, k = 1; i < 256; i++)
109 p->NS2Indx[i] = (Byte)m;
114 memset(p->HB2Flag, 0, 0x40);
115 memset(p->HB2Flag + 0x40, 8, 0x100 - 0x40);
118 static void Ppmd7_Free(CPpmd7 *p, ISzAlloc *alloc)
120 alloc->Free(alloc, p->Base);
125 static Bool Ppmd7_Alloc(CPpmd7 *p, UInt32 size, ISzAlloc *alloc)
127 if (p->Base == 0 || p->Size != size)
129 Ppmd7_Free(p, alloc);
136 if ((p->Base = (Byte *)alloc->Alloc(alloc, p->AlignOffset + size
147 static void InsertNode(CPpmd7 *p, void *node, unsigned indx)
149 *((CPpmd_Void_Ref *)node) = p->FreeList[indx];
150 p->FreeList[indx] = REF(node);
153 static void *RemoveNode(CPpmd7 *p, unsigned indx)
155 CPpmd_Void_Ref *node = (CPpmd_Void_Ref *)Ppmd7_GetPtr(p, p->FreeList[indx]);
156 p->FreeList[indx] = *node;
160 static void SplitBlock(CPpmd7 *p, void *ptr, unsigned oldIndx, unsigned newIndx)
162 unsigned i, nu = I2U(oldIndx) - I2U(newIndx);
163 ptr = (Byte *)ptr + U2B(I2U(newIndx));
164 if (I2U(i = U2I(nu)) != nu)
166 unsigned k = I2U(--i);
167 InsertNode(p, ((Byte *)ptr) + U2B(k), nu - k - 1);
169 InsertNode(p, ptr, i);
172 static void GlueFreeBlocks(CPpmd7 *p)
175 CPpmd7_Node headItem;
176 CPpmd7_Node_Ref head = &headItem;
178 CPpmd7_Node_Ref head = p->AlignOffset + p->Size;
181 CPpmd7_Node_Ref n = head;
186 /* create doubly-linked list of free blocks */
187 for (i = 0; i < PPMD_NUM_INDEXES; i++)
190 CPpmd7_Node_Ref next = (CPpmd7_Node_Ref)p->FreeList[i];
194 CPpmd7_Node *node = NODE(next);
196 n = NODE(n)->Prev = next;
197 next = *(const CPpmd7_Node_Ref *)node;
199 node->NU = (UInt16)nu;
202 NODE(head)->Stamp = 1;
203 NODE(head)->Next = n;
204 NODE(n)->Prev = head;
205 if (p->LoUnit != p->HiUnit)
206 ((CPpmd7_Node *)p->LoUnit)->Stamp = 1;
208 /* Glue free blocks */
211 CPpmd7_Node *node = NODE(n);
212 UInt32 nu = (UInt32)node->NU;
215 CPpmd7_Node *node2 = NODE(n) + nu;
217 if (node2->Stamp != 0 || nu >= 0x10000)
219 NODE(node2->Prev)->Next = node2->Next;
220 NODE(node2->Next)->Prev = node2->Prev;
221 node->NU = (UInt16)nu;
226 /* Fill lists of free blocks */
227 for (n = NODE(head)->Next; n != head;)
229 CPpmd7_Node *node = NODE(n);
231 CPpmd7_Node_Ref next = node->Next;
232 for (nu = node->NU; nu > 128; nu -= 128, node += 128)
233 InsertNode(p, node, PPMD_NUM_INDEXES - 1);
234 if (I2U(i = U2I(nu)) != nu)
236 unsigned k = I2U(--i);
237 InsertNode(p, node + k, nu - k - 1);
239 InsertNode(p, node, i);
244 static void *AllocUnitsRare(CPpmd7 *p, unsigned indx)
248 if (p->GlueCount == 0)
251 if (p->FreeList[indx] != 0)
252 return RemoveNode(p, indx);
257 if (++i == PPMD_NUM_INDEXES)
259 UInt32 numBytes = U2B(I2U(indx));
261 return ((UInt32)(p->UnitsStart - p->Text) > numBytes) ? (p->UnitsStart -= numBytes) : (NULL);
264 while (p->FreeList[i] == 0);
265 retVal = RemoveNode(p, i);
266 SplitBlock(p, retVal, i, indx);
270 static void *AllocUnits(CPpmd7 *p, unsigned indx)
273 if (p->FreeList[indx] != 0)
274 return RemoveNode(p, indx);
275 numBytes = U2B(I2U(indx));
276 if (numBytes <= (UInt32)(p->HiUnit - p->LoUnit))
278 void *retVal = p->LoUnit;
279 p->LoUnit += numBytes;
282 return AllocUnitsRare(p, indx);
285 #define MyMem12Cpy(dest, src, num) \
286 { UInt32 *d = (UInt32 *)dest; const UInt32 *s = (const UInt32 *)src; UInt32 n = num; \
287 do { d[0] = s[0]; d[1] = s[1]; d[2] = s[2]; s += 3; d += 3; } while(--n); }
289 static void *ShrinkUnits(CPpmd7 *p, void *oldPtr, unsigned oldNU, unsigned newNU)
291 unsigned i0 = U2I(oldNU);
292 unsigned i1 = U2I(newNU);
295 if (p->FreeList[i1] != 0)
297 void *ptr = RemoveNode(p, i1);
298 MyMem12Cpy(ptr, oldPtr, newNU);
299 InsertNode(p, oldPtr, i0);
302 SplitBlock(p, oldPtr, i0, i1);
306 #define SUCCESSOR(p) ((CPpmd_Void_Ref)((p)->SuccessorLow | ((UInt32)(p)->SuccessorHigh << 16)))
308 static void SetSuccessor(CPpmd_State *p, CPpmd_Void_Ref v)
310 (p)->SuccessorLow = (UInt16)((UInt32)(v) & 0xFFFF);
311 (p)->SuccessorHigh = (UInt16)(((UInt32)(v) >> 16) & 0xFFFF);
314 static void RestartModel(CPpmd7 *p)
318 memset(p->FreeList, 0, sizeof(p->FreeList));
319 p->Text = p->Base + p->AlignOffset;
320 p->HiUnit = p->Text + p->Size;
321 p->LoUnit = p->UnitsStart = p->HiUnit - p->Size / 8 / UNIT_SIZE * 7 * UNIT_SIZE;
324 p->OrderFall = p->MaxOrder;
325 p->RunLength = p->InitRL = -(Int32)((p->MaxOrder < 12) ? p->MaxOrder : 12) - 1;
328 p->MinContext = p->MaxContext = (CTX_PTR)(p->HiUnit -= UNIT_SIZE); /* AllocContext(p); */
329 p->MinContext->Suffix = 0;
330 p->MinContext->NumStats = 256;
331 p->MinContext->SummFreq = 256 + 1;
332 p->FoundState = (CPpmd_State *)p->LoUnit; /* AllocUnits(p, PPMD_NUM_INDEXES - 1); */
333 p->LoUnit += U2B(256 / 2);
334 p->MinContext->Stats = REF(p->FoundState);
335 for (i = 0; i < 256; i++)
337 CPpmd_State *s = &p->FoundState[i];
343 for (i = 0; i < 128; i++)
344 for (k = 0; k < 8; k++)
346 UInt16 *dest = p->BinSumm[i] + k;
347 UInt16 val = (UInt16)(PPMD_BIN_SCALE - kInitBinEsc[k] / (i + 2));
348 for (m = 0; m < 64; m += 8)
352 for (i = 0; i < 25; i++)
353 for (k = 0; k < 16; k++)
355 CPpmd_See *s = &p->See[i][k];
356 s->Summ = (UInt16)((5 * i + 10) << (s->Shift = PPMD_PERIOD_BITS - 4));
361 static void Ppmd7_Init(CPpmd7 *p, unsigned maxOrder)
363 p->MaxOrder = maxOrder;
365 p->DummySee.Shift = PPMD_PERIOD_BITS;
366 p->DummySee.Summ = 0; /* unused */
367 p->DummySee.Count = 64; /* unused */
370 static CTX_PTR CreateSuccessors(CPpmd7 *p, Bool skip)
373 CTX_PTR c = p->MinContext;
374 CPpmd_Byte_Ref upBranch = (CPpmd_Byte_Ref)SUCCESSOR(p->FoundState);
375 CPpmd_State *ps[PPMD7_MAX_ORDER];
379 ps[numPs++] = p->FoundState;
383 CPpmd_Void_Ref successor;
386 if (c->NumStats != 1)
388 for (s = STATS(c); s->Symbol != p->FoundState->Symbol; s++);
392 successor = SUCCESSOR(s);
393 if (successor != upBranch)
403 upState.Symbol = *(const Byte *)Ppmd7_GetPtr(p, upBranch);
404 SetSuccessor(&upState, upBranch + 1);
406 if (c->NumStats == 1)
407 upState.Freq = ONE_STATE(c)->Freq;
412 for (s = STATS(c); s->Symbol != upState.Symbol; s++);
414 s0 = c->SummFreq - c->NumStats - cf;
415 upState.Freq = (Byte)(1 + ((2 * cf <= s0) ? (5 * cf > s0) : ((2 * cf + 3 * s0 - 1) / (2 * s0))));
421 CTX_PTR c1; /* = AllocContext(p); */
422 if (p->HiUnit != p->LoUnit)
423 c1 = (CTX_PTR)(p->HiUnit -= UNIT_SIZE);
424 else if (p->FreeList[0] != 0)
425 c1 = (CTX_PTR)RemoveNode(p, 0);
428 c1 = (CTX_PTR)AllocUnitsRare(p, 0);
433 *ONE_STATE(c1) = upState;
435 SetSuccessor(ps[--numPs], REF(c1));
442 static void SwapStates(CPpmd_State *t1, CPpmd_State *t2)
444 CPpmd_State tmp = *t1;
449 static void UpdateModel(CPpmd7 *p)
451 CPpmd_Void_Ref successor, fSuccessor = SUCCESSOR(p->FoundState);
455 if (p->FoundState->Freq < MAX_FREQ / 4 && p->MinContext->Suffix != 0)
457 c = SUFFIX(p->MinContext);
459 if (c->NumStats == 1)
461 CPpmd_State *s = ONE_STATE(c);
467 CPpmd_State *s = STATS(c);
468 if (s->Symbol != p->FoundState->Symbol)
470 do { s++; } while (s->Symbol != p->FoundState->Symbol);
471 if (s[0].Freq >= s[-1].Freq)
473 SwapStates(&s[0], &s[-1]);
477 if (s->Freq < MAX_FREQ - 9)
485 if (p->OrderFall == 0)
487 p->MinContext = p->MaxContext = CreateSuccessors(p, True);
488 if (p->MinContext == 0)
493 SetSuccessor(p->FoundState, REF(p->MinContext));
497 *p->Text++ = p->FoundState->Symbol;
498 successor = REF(p->Text);
499 if (p->Text >= p->UnitsStart)
507 if (fSuccessor <= successor)
509 CTX_PTR cs = CreateSuccessors(p, False);
515 fSuccessor = REF(cs);
517 if (--p->OrderFall == 0)
519 successor = fSuccessor;
520 p->Text -= (p->MaxContext != p->MinContext);
525 SetSuccessor(p->FoundState, successor);
526 fSuccessor = REF(p->MinContext);
529 s0 = p->MinContext->SummFreq - (ns = p->MinContext->NumStats) - (p->FoundState->Freq - 1);
531 for (c = p->MaxContext; c != p->MinContext; c = SUFFIX(c))
535 if ((ns1 = c->NumStats) != 1)
539 /* Expand for one UNIT */
540 unsigned oldNU = ns1 >> 1;
541 unsigned i = U2I(oldNU);
542 if (i != U2I(oldNU + 1))
544 void *ptr = AllocUnits(p, i + 1);
552 MyMem12Cpy(ptr, oldPtr, oldNU);
553 InsertNode(p, oldPtr, i);
554 c->Stats = STATS_REF(ptr);
557 c->SummFreq = (UInt16)(c->SummFreq + (2 * ns1 < ns) + 2 * ((4 * ns1 <= ns) & (c->SummFreq <= 8 * ns1)));
561 CPpmd_State *s = (CPpmd_State*)AllocUnits(p, 0);
569 if (s->Freq < MAX_FREQ / 4 - 1)
572 s->Freq = MAX_FREQ - 4;
573 c->SummFreq = (UInt16)(s->Freq + p->InitEsc + (ns > 3));
575 cf = 2 * (UInt32)p->FoundState->Freq * (c->SummFreq + 6);
576 sf = (UInt32)s0 + c->SummFreq;
579 cf = 1 + (cf > sf) + (cf >= 4 * sf);
584 cf = 4 + (cf >= 9 * sf) + (cf >= 12 * sf) + (cf >= 15 * sf);
585 c->SummFreq = (UInt16)(c->SummFreq + cf);
588 CPpmd_State *s = STATS(c) + ns1;
589 SetSuccessor(s, successor);
590 s->Symbol = p->FoundState->Symbol;
592 c->NumStats = (UInt16)(ns1 + 1);
595 p->MaxContext = p->MinContext = CTX(fSuccessor);
598 static void Rescale(CPpmd7 *p)
600 unsigned i, adder, sumFreq, escFreq;
601 CPpmd_State *stats = STATS(p->MinContext);
602 CPpmd_State *s = p->FoundState;
604 CPpmd_State tmp = *s;
605 for (; s != stats; s--)
609 escFreq = p->MinContext->SummFreq - s->Freq;
611 adder = (p->OrderFall != 0);
612 s->Freq = (Byte)((s->Freq + adder) >> 1);
615 i = p->MinContext->NumStats - 1;
618 escFreq -= (++s)->Freq;
619 s->Freq = (Byte)((s->Freq + adder) >> 1);
621 if (s[0].Freq > s[-1].Freq)
624 CPpmd_State tmp = *s1;
627 while (--s1 != stats && tmp.Freq > s1[-1].Freq);
635 unsigned numStats = p->MinContext->NumStats;
637 do { i++; } while ((--s)->Freq == 0);
639 p->MinContext->NumStats = (UInt16)(p->MinContext->NumStats - i);
640 if (p->MinContext->NumStats == 1)
642 CPpmd_State tmp = *stats;
645 tmp.Freq = (Byte)(tmp.Freq - (tmp.Freq >> 1));
649 InsertNode(p, stats, U2I(((numStats + 1) >> 1)));
650 *(p->FoundState = ONE_STATE(p->MinContext)) = tmp;
653 n0 = (numStats + 1) >> 1;
654 n1 = (p->MinContext->NumStats + 1) >> 1;
656 p->MinContext->Stats = STATS_REF(ShrinkUnits(p, stats, n0, n1));
658 p->MinContext->SummFreq = (UInt16)(sumFreq + escFreq - (escFreq >> 1));
659 p->FoundState = STATS(p->MinContext);
662 static CPpmd_See *Ppmd7_MakeEscFreq(CPpmd7 *p, unsigned numMasked, UInt32 *escFreq)
665 unsigned nonMasked = p->MinContext->NumStats - numMasked;
666 if (p->MinContext->NumStats != 256)
668 see = p->See[p->NS2Indx[nonMasked - 1]] +
669 (nonMasked < (unsigned)SUFFIX(p->MinContext)->NumStats - p->MinContext->NumStats) +
670 2 * (p->MinContext->SummFreq < 11 * p->MinContext->NumStats) +
671 4 * (numMasked > nonMasked) +
674 unsigned r = (see->Summ >> see->Shift);
675 see->Summ = (UInt16)(see->Summ - r);
676 *escFreq = r + (r == 0);
687 static void NextContext(CPpmd7 *p)
689 CTX_PTR c = CTX(SUCCESSOR(p->FoundState));
690 if (p->OrderFall == 0 && (Byte *)c > p->Text)
691 p->MinContext = p->MaxContext = c;
696 static void Ppmd7_Update1(CPpmd7 *p)
698 CPpmd_State *s = p->FoundState;
700 p->MinContext->SummFreq += 4;
701 if (s[0].Freq > s[-1].Freq)
703 SwapStates(&s[0], &s[-1]);
705 if (s->Freq > MAX_FREQ)
711 static void Ppmd7_Update1_0(CPpmd7 *p)
713 p->PrevSuccess = (2 * p->FoundState->Freq > p->MinContext->SummFreq);
714 p->RunLength += p->PrevSuccess;
715 p->MinContext->SummFreq += 4;
716 if ((p->FoundState->Freq += 4) > MAX_FREQ)
721 static void Ppmd7_UpdateBin(CPpmd7 *p)
723 p->FoundState->Freq = (Byte)(p->FoundState->Freq + (p->FoundState->Freq < 128 ? 1: 0));
729 static void Ppmd7_Update2(CPpmd7 *p)
731 p->MinContext->SummFreq += 4;
732 if ((p->FoundState->Freq += 4) > MAX_FREQ)
734 p->RunLength = p->InitRL;
738 /* ---------- Decode ---------- */
740 static Bool Ppmd_RangeDec_Init(CPpmd7z_RangeDec *p)
743 p->Low = p->Bottom = 0;
744 p->Range = 0xFFFFFFFF;
745 for (i = 0; i < 4; i++)
746 p->Code = (p->Code << 8) | p->Stream->Read((void *)p->Stream);
747 return (p->Code < 0xFFFFFFFF);
750 static Bool Ppmd7z_RangeDec_Init(CPpmd7z_RangeDec *p)
752 if (p->Stream->Read((void *)p->Stream) != 0)
754 return Ppmd_RangeDec_Init(p);
757 static Bool PpmdRAR_RangeDec_Init(CPpmd7z_RangeDec *p)
759 if (!Ppmd_RangeDec_Init(p))
765 static UInt32 Range_GetThreshold(void *pp, UInt32 total)
767 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
768 return (p->Code - p->Low) / (p->Range /= total);
771 static void Range_Normalize(CPpmd7z_RangeDec *p)
775 if((p->Low ^ (p->Low + p->Range)) >= kTopValue)
777 if(p->Range >= p->Bottom)
780 p->Range = ((uint32_t)(-(int32_t)p->Low)) & (p->Bottom - 1);
782 p->Code = (p->Code << 8) | p->Stream->Read((void *)p->Stream);
788 static void Range_Decode_7z(void *pp, UInt32 start, UInt32 size)
790 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
791 p->Code -= start * p->Range;
796 static void Range_Decode_RAR(void *pp, UInt32 start, UInt32 size)
798 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
799 p->Low += start * p->Range;
804 static UInt32 Range_DecodeBit_7z(void *pp, UInt32 size0)
806 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
807 UInt32 newBound = (p->Range >> 14) * size0;
809 if (p->Code < newBound)
818 p->Range -= newBound;
824 static UInt32 Range_DecodeBit_RAR(void *pp, UInt32 size0)
826 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
827 UInt32 bit, value = p->p.GetThreshold(p, PPMD_BIN_SCALE);
831 p->p.Decode(p, 0, size0);
836 p->p.Decode(p, size0, PPMD_BIN_SCALE - size0);
841 static void Ppmd7z_RangeDec_CreateVTable(CPpmd7z_RangeDec *p)
843 p->p.GetThreshold = Range_GetThreshold;
844 p->p.Decode = Range_Decode_7z;
845 p->p.DecodeBit = Range_DecodeBit_7z;
848 static void PpmdRAR_RangeDec_CreateVTable(CPpmd7z_RangeDec *p)
850 p->p.GetThreshold = Range_GetThreshold;
851 p->p.Decode = Range_Decode_RAR;
852 p->p.DecodeBit = Range_DecodeBit_RAR;
855 #define MASK(sym) ((signed char *)charMask)[sym]
857 static int Ppmd7_DecodeSymbol(CPpmd7 *p, IPpmd7_RangeDec *rc)
859 size_t charMask[256 / sizeof(size_t)];
860 if (p->MinContext->NumStats != 1)
862 CPpmd_State *s = Ppmd7_GetStats(p, p->MinContext);
865 if ((count = rc->GetThreshold(rc, p->MinContext->SummFreq)) < (hiCnt = s->Freq))
868 rc->Decode(rc, 0, s->Freq);
875 i = p->MinContext->NumStats - 1;
878 if ((hiCnt += (++s)->Freq) > count)
881 rc->Decode(rc, hiCnt - s->Freq, s->Freq);
889 if (count >= p->MinContext->SummFreq)
891 p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol];
892 rc->Decode(rc, hiCnt, p->MinContext->SummFreq - hiCnt);
893 PPMD_SetAllBitsIn256Bytes(charMask);
895 i = p->MinContext->NumStats - 1;
896 do { MASK((--s)->Symbol) = 0; } while (--i);
900 UInt16 *prob = Ppmd7_GetBinSumm(p);
901 if (rc->DecodeBit(rc, *prob) == 0)
904 *prob = (UInt16)PPMD_UPDATE_PROB_0(*prob);
905 symbol = (p->FoundState = Ppmd7Context_OneState(p->MinContext))->Symbol;
909 *prob = (UInt16)PPMD_UPDATE_PROB_1(*prob);
910 p->InitEsc = PPMD7_kExpEscape[*prob >> 10];
911 PPMD_SetAllBitsIn256Bytes(charMask);
912 MASK(Ppmd7Context_OneState(p->MinContext)->Symbol) = 0;
917 CPpmd_State *ps[256], *s;
918 UInt32 freqSum, count, hiCnt;
920 unsigned i, num, numMasked = p->MinContext->NumStats;
924 if (!p->MinContext->Suffix)
926 p->MinContext = Ppmd7_GetContext(p, p->MinContext->Suffix);
928 while (p->MinContext->NumStats == numMasked);
930 s = Ppmd7_GetStats(p, p->MinContext);
932 num = p->MinContext->NumStats - numMasked;
935 int k = (int)(MASK(s->Symbol));
936 hiCnt += (s->Freq & k);
942 see = Ppmd7_MakeEscFreq(p, numMasked, &freqSum);
944 count = rc->GetThreshold(rc, freqSum);
949 CPpmd_State **pps = ps;
950 for (hiCnt = 0; (hiCnt += (*pps)->Freq) <= count; pps++);
952 rc->Decode(rc, hiCnt - s->Freq, s->Freq);
953 Ppmd_See_Update(see);
959 if (count >= freqSum)
961 rc->Decode(rc, hiCnt, freqSum - hiCnt);
962 see->Summ = (UInt16)(see->Summ + freqSum);
963 do { MASK(ps[--i]->Symbol) = 0; } while (i != 0);
967 /* ---------- Encode ---------- Ppmd7Enc.c */
969 #define kTopValue (1 << 24)
971 static void Ppmd7z_RangeEnc_Init(CPpmd7z_RangeEnc *p)
974 p->Range = 0xFFFFFFFF;
979 static void RangeEnc_ShiftLow(CPpmd7z_RangeEnc *p)
981 if ((UInt32)p->Low < (UInt32)0xFF000000 || (unsigned)(p->Low >> 32) != 0)
983 Byte temp = p->Cache;
986 p->Stream->Write(p->Stream, (Byte)(temp + (Byte)(p->Low >> 32)));
989 while(--p->CacheSize != 0);
990 p->Cache = (Byte)((UInt32)p->Low >> 24);
993 p->Low = ((UInt32)p->Low << 8) & 0xFFFFFFFF;
996 static void RangeEnc_Encode(CPpmd7z_RangeEnc *p, UInt32 start, UInt32 size, UInt32 total)
998 p->Low += start * (p->Range /= total);
1000 while (p->Range < kTopValue)
1003 RangeEnc_ShiftLow(p);
1007 static void RangeEnc_EncodeBit_0(CPpmd7z_RangeEnc *p, UInt32 size0)
1009 p->Range = (p->Range >> 14) * size0;
1010 while (p->Range < kTopValue)
1013 RangeEnc_ShiftLow(p);
1017 static void RangeEnc_EncodeBit_1(CPpmd7z_RangeEnc *p, UInt32 size0)
1019 UInt32 newBound = (p->Range >> 14) * size0;
1021 p->Range -= newBound;
1022 while (p->Range < kTopValue)
1025 RangeEnc_ShiftLow(p);
1029 static void Ppmd7z_RangeEnc_FlushData(CPpmd7z_RangeEnc *p)
1032 for (i = 0; i < 5; i++)
1033 RangeEnc_ShiftLow(p);
1037 #define MASK(sym) ((signed char *)charMask)[sym]
1039 static void Ppmd7_EncodeSymbol(CPpmd7 *p, CPpmd7z_RangeEnc *rc, int symbol)
1041 size_t charMask[256 / sizeof(size_t)];
1042 if (p->MinContext->NumStats != 1)
1044 CPpmd_State *s = Ppmd7_GetStats(p, p->MinContext);
1047 if (s->Symbol == symbol)
1049 RangeEnc_Encode(rc, 0, s->Freq, p->MinContext->SummFreq);
1056 i = p->MinContext->NumStats - 1;
1059 if ((++s)->Symbol == symbol)
1061 RangeEnc_Encode(rc, sum, s->Freq, p->MinContext->SummFreq);
1070 p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol];
1071 PPMD_SetAllBitsIn256Bytes(charMask);
1072 MASK(s->Symbol) = 0;
1073 i = p->MinContext->NumStats - 1;
1074 do { MASK((--s)->Symbol) = 0; } while (--i);
1075 RangeEnc_Encode(rc, sum, p->MinContext->SummFreq - sum, p->MinContext->SummFreq);
1079 UInt16 *prob = Ppmd7_GetBinSumm(p);
1080 CPpmd_State *s = Ppmd7Context_OneState(p->MinContext);
1081 if (s->Symbol == symbol)
1083 RangeEnc_EncodeBit_0(rc, *prob);
1084 *prob = (UInt16)PPMD_UPDATE_PROB_0(*prob);
1091 RangeEnc_EncodeBit_1(rc, *prob);
1092 *prob = (UInt16)PPMD_UPDATE_PROB_1(*prob);
1093 p->InitEsc = PPMD7_kExpEscape[*prob >> 10];
1094 PPMD_SetAllBitsIn256Bytes(charMask);
1095 MASK(s->Symbol) = 0;
1105 unsigned i, numMasked = p->MinContext->NumStats;
1109 if (!p->MinContext->Suffix)
1110 return; /* EndMarker (symbol = -1) */
1111 p->MinContext = Ppmd7_GetContext(p, p->MinContext->Suffix);
1113 while (p->MinContext->NumStats == numMasked);
1115 see = Ppmd7_MakeEscFreq(p, numMasked, &escFreq);
1116 s = Ppmd7_GetStats(p, p->MinContext);
1118 i = p->MinContext->NumStats;
1121 int cur = s->Symbol;
1125 CPpmd_State *s1 = s;
1128 sum += (s->Freq & (int)(MASK(s->Symbol)));
1132 RangeEnc_Encode(rc, low, s1->Freq, sum + escFreq);
1133 Ppmd_See_Update(see);
1138 sum += (s->Freq & (int)(MASK(cur)));
1144 RangeEnc_Encode(rc, sum, escFreq, sum + escFreq);
1145 see->Summ = (UInt16)(see->Summ + sum + escFreq);
1149 const IPpmd7 __archive_ppmd7_functions =
1155 &Ppmd7z_RangeDec_CreateVTable,
1156 &PpmdRAR_RangeDec_CreateVTable,
1157 &Ppmd7z_RangeDec_Init,
1158 &PpmdRAR_RangeDec_Init,
1159 &Ppmd7_DecodeSymbol,
1160 &Ppmd7z_RangeEnc_Init,
1161 &Ppmd7z_RangeEnc_FlushData,