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)
125 static Bool Ppmd7_Alloc(CPpmd7 *p, UInt32 size)
127 if (p->Base == 0 || p->Size != size)
129 /* RestartModel() below assumes that p->Size >= UNIT_SIZE
130 (see the calculation of m->MinContext). */
131 if (size < UNIT_SIZE) {
141 if ((p->Base = (Byte *)malloc(p->AlignOffset + size
152 static void InsertNode(CPpmd7 *p, void *node, unsigned indx)
154 *((CPpmd_Void_Ref *)node) = p->FreeList[indx];
155 p->FreeList[indx] = REF(node);
158 static void *RemoveNode(CPpmd7 *p, unsigned indx)
160 CPpmd_Void_Ref *node = (CPpmd_Void_Ref *)Ppmd7_GetPtr(p, p->FreeList[indx]);
161 p->FreeList[indx] = *node;
165 static void SplitBlock(CPpmd7 *p, void *ptr, unsigned oldIndx, unsigned newIndx)
167 unsigned i, nu = I2U(oldIndx) - I2U(newIndx);
168 ptr = (Byte *)ptr + U2B(I2U(newIndx));
169 if (I2U(i = U2I(nu)) != nu)
171 unsigned k = I2U(--i);
172 InsertNode(p, ((Byte *)ptr) + U2B(k), nu - k - 1);
174 InsertNode(p, ptr, i);
177 static void GlueFreeBlocks(CPpmd7 *p)
180 CPpmd7_Node headItem;
181 CPpmd7_Node_Ref head = &headItem;
183 CPpmd7_Node_Ref head = p->AlignOffset + p->Size;
186 CPpmd7_Node_Ref n = head;
191 /* create doubly-linked list of free blocks */
192 for (i = 0; i < PPMD_NUM_INDEXES; i++)
195 CPpmd7_Node_Ref next = (CPpmd7_Node_Ref)p->FreeList[i];
199 CPpmd7_Node *node = NODE(next);
201 n = NODE(n)->Prev = next;
202 next = *(const CPpmd7_Node_Ref *)node;
204 node->NU = (UInt16)nu;
207 NODE(head)->Stamp = 1;
208 NODE(head)->Next = n;
209 NODE(n)->Prev = head;
210 if (p->LoUnit != p->HiUnit)
211 ((CPpmd7_Node *)p->LoUnit)->Stamp = 1;
213 /* Glue free blocks */
216 CPpmd7_Node *node = NODE(n);
217 UInt32 nu = (UInt32)node->NU;
220 CPpmd7_Node *node2 = NODE(n) + nu;
222 if (node2->Stamp != 0 || nu >= 0x10000)
224 NODE(node2->Prev)->Next = node2->Next;
225 NODE(node2->Next)->Prev = node2->Prev;
226 node->NU = (UInt16)nu;
231 /* Fill lists of free blocks */
232 for (n = NODE(head)->Next; n != head;)
234 CPpmd7_Node *node = NODE(n);
236 CPpmd7_Node_Ref next = node->Next;
237 for (nu = node->NU; nu > 128; nu -= 128, node += 128)
238 InsertNode(p, node, PPMD_NUM_INDEXES - 1);
239 if (I2U(i = U2I(nu)) != nu)
241 unsigned k = I2U(--i);
242 InsertNode(p, node + k, nu - k - 1);
244 InsertNode(p, node, i);
249 static void *AllocUnitsRare(CPpmd7 *p, unsigned indx)
253 if (p->GlueCount == 0)
256 if (p->FreeList[indx] != 0)
257 return RemoveNode(p, indx);
262 if (++i == PPMD_NUM_INDEXES)
264 UInt32 numBytes = U2B(I2U(indx));
266 return ((UInt32)(p->UnitsStart - p->Text) > numBytes) ? (p->UnitsStart -= numBytes) : (NULL);
269 while (p->FreeList[i] == 0);
270 retVal = RemoveNode(p, i);
271 SplitBlock(p, retVal, i, indx);
275 static void *AllocUnits(CPpmd7 *p, unsigned indx)
278 if (p->FreeList[indx] != 0)
279 return RemoveNode(p, indx);
280 numBytes = U2B(I2U(indx));
281 if (numBytes <= (UInt32)(p->HiUnit - p->LoUnit))
283 void *retVal = p->LoUnit;
284 p->LoUnit += numBytes;
287 return AllocUnitsRare(p, indx);
290 #define MyMem12Cpy(dest, src, num) \
291 { UInt32 *d = (UInt32 *)dest; const UInt32 *s = (const UInt32 *)src; UInt32 n = num; \
292 do { d[0] = s[0]; d[1] = s[1]; d[2] = s[2]; s += 3; d += 3; } while(--n); }
294 static void *ShrinkUnits(CPpmd7 *p, void *oldPtr, unsigned oldNU, unsigned newNU)
296 unsigned i0 = U2I(oldNU);
297 unsigned i1 = U2I(newNU);
300 if (p->FreeList[i1] != 0)
302 void *ptr = RemoveNode(p, i1);
303 MyMem12Cpy(ptr, oldPtr, newNU);
304 InsertNode(p, oldPtr, i0);
307 SplitBlock(p, oldPtr, i0, i1);
311 #define SUCCESSOR(p) ((CPpmd_Void_Ref)((p)->SuccessorLow | ((UInt32)(p)->SuccessorHigh << 16)))
313 static void SetSuccessor(CPpmd_State *p, CPpmd_Void_Ref v)
315 (p)->SuccessorLow = (UInt16)((UInt32)(v) & 0xFFFF);
316 (p)->SuccessorHigh = (UInt16)(((UInt32)(v) >> 16) & 0xFFFF);
319 static void RestartModel(CPpmd7 *p)
323 memset(p->FreeList, 0, sizeof(p->FreeList));
324 p->Text = p->Base + p->AlignOffset;
325 p->HiUnit = p->Text + p->Size;
326 p->LoUnit = p->UnitsStart = p->HiUnit - p->Size / 8 / UNIT_SIZE * 7 * UNIT_SIZE;
329 p->OrderFall = p->MaxOrder;
330 p->RunLength = p->InitRL = -(Int32)((p->MaxOrder < 12) ? p->MaxOrder : 12) - 1;
333 p->MinContext = p->MaxContext = (CTX_PTR)(p->HiUnit -= UNIT_SIZE); /* AllocContext(p); */
334 p->MinContext->Suffix = 0;
335 p->MinContext->NumStats = 256;
336 p->MinContext->SummFreq = 256 + 1;
337 p->FoundState = (CPpmd_State *)p->LoUnit; /* AllocUnits(p, PPMD_NUM_INDEXES - 1); */
338 p->LoUnit += U2B(256 / 2);
339 p->MinContext->Stats = REF(p->FoundState);
340 for (i = 0; i < 256; i++)
342 CPpmd_State *s = &p->FoundState[i];
348 for (i = 0; i < 128; i++)
349 for (k = 0; k < 8; k++)
351 UInt16 *dest = p->BinSumm[i] + k;
352 UInt16 val = (UInt16)(PPMD_BIN_SCALE - kInitBinEsc[k] / (i + 2));
353 for (m = 0; m < 64; m += 8)
357 for (i = 0; i < 25; i++)
358 for (k = 0; k < 16; k++)
360 CPpmd_See *s = &p->See[i][k];
361 s->Summ = (UInt16)((5 * i + 10) << (s->Shift = PPMD_PERIOD_BITS - 4));
366 static void Ppmd7_Init(CPpmd7 *p, unsigned maxOrder)
368 p->MaxOrder = maxOrder;
370 p->DummySee.Shift = PPMD_PERIOD_BITS;
371 p->DummySee.Summ = 0; /* unused */
372 p->DummySee.Count = 64; /* unused */
375 static CTX_PTR CreateSuccessors(CPpmd7 *p, Bool skip)
378 CTX_PTR c = p->MinContext;
379 CPpmd_Byte_Ref upBranch = (CPpmd_Byte_Ref)SUCCESSOR(p->FoundState);
380 CPpmd_State *ps[PPMD7_MAX_ORDER];
384 ps[numPs++] = p->FoundState;
388 CPpmd_Void_Ref successor;
391 if (c->NumStats != 1)
393 for (s = STATS(c); s->Symbol != p->FoundState->Symbol; s++);
397 successor = SUCCESSOR(s);
398 if (successor != upBranch)
408 upState.Symbol = *(const Byte *)Ppmd7_GetPtr(p, upBranch);
409 SetSuccessor(&upState, upBranch + 1);
411 if (c->NumStats == 1)
412 upState.Freq = ONE_STATE(c)->Freq;
417 for (s = STATS(c); s->Symbol != upState.Symbol; s++);
419 s0 = c->SummFreq - c->NumStats - cf;
420 upState.Freq = (Byte)(1 + ((2 * cf <= s0) ? (5 * cf > s0) : ((2 * cf + 3 * s0 - 1) / (2 * s0))));
426 CTX_PTR c1; /* = AllocContext(p); */
427 if (p->HiUnit != p->LoUnit)
428 c1 = (CTX_PTR)(p->HiUnit -= UNIT_SIZE);
429 else if (p->FreeList[0] != 0)
430 c1 = (CTX_PTR)RemoveNode(p, 0);
433 c1 = (CTX_PTR)AllocUnitsRare(p, 0);
438 *ONE_STATE(c1) = upState;
440 SetSuccessor(ps[--numPs], REF(c1));
447 static void SwapStates(CPpmd_State *t1, CPpmd_State *t2)
449 CPpmd_State tmp = *t1;
454 static void UpdateModel(CPpmd7 *p)
456 CPpmd_Void_Ref successor, fSuccessor = SUCCESSOR(p->FoundState);
460 if (p->FoundState->Freq < MAX_FREQ / 4 && p->MinContext->Suffix != 0)
462 c = SUFFIX(p->MinContext);
464 if (c->NumStats == 1)
466 CPpmd_State *s = ONE_STATE(c);
472 CPpmd_State *s = STATS(c);
473 if (s->Symbol != p->FoundState->Symbol)
475 do { s++; } while (s->Symbol != p->FoundState->Symbol);
476 if (s[0].Freq >= s[-1].Freq)
478 SwapStates(&s[0], &s[-1]);
482 if (s->Freq < MAX_FREQ - 9)
490 if (p->OrderFall == 0)
492 p->MinContext = p->MaxContext = CreateSuccessors(p, True);
493 if (p->MinContext == 0)
498 SetSuccessor(p->FoundState, REF(p->MinContext));
502 *p->Text++ = p->FoundState->Symbol;
503 successor = REF(p->Text);
504 if (p->Text >= p->UnitsStart)
512 if (fSuccessor <= successor)
514 CTX_PTR cs = CreateSuccessors(p, False);
520 fSuccessor = REF(cs);
522 if (--p->OrderFall == 0)
524 successor = fSuccessor;
525 p->Text -= (p->MaxContext != p->MinContext);
530 SetSuccessor(p->FoundState, successor);
531 fSuccessor = REF(p->MinContext);
534 s0 = p->MinContext->SummFreq - (ns = p->MinContext->NumStats) - (p->FoundState->Freq - 1);
536 for (c = p->MaxContext; c != p->MinContext; c = SUFFIX(c))
540 if ((ns1 = c->NumStats) != 1)
544 /* Expand for one UNIT */
545 unsigned oldNU = ns1 >> 1;
546 unsigned i = U2I(oldNU);
547 if (i != U2I(oldNU + 1))
549 void *ptr = AllocUnits(p, i + 1);
557 MyMem12Cpy(ptr, oldPtr, oldNU);
558 InsertNode(p, oldPtr, i);
559 c->Stats = STATS_REF(ptr);
562 c->SummFreq = (UInt16)(c->SummFreq + (2 * ns1 < ns) + 2 * ((4 * ns1 <= ns) & (c->SummFreq <= 8 * ns1)));
566 CPpmd_State *s = (CPpmd_State*)AllocUnits(p, 0);
574 if (s->Freq < MAX_FREQ / 4 - 1)
577 s->Freq = MAX_FREQ - 4;
578 c->SummFreq = (UInt16)(s->Freq + p->InitEsc + (ns > 3));
580 cf = 2 * (UInt32)p->FoundState->Freq * (c->SummFreq + 6);
581 sf = (UInt32)s0 + c->SummFreq;
584 cf = 1 + (cf > sf) + (cf >= 4 * sf);
589 cf = 4 + (cf >= 9 * sf) + (cf >= 12 * sf) + (cf >= 15 * sf);
590 c->SummFreq = (UInt16)(c->SummFreq + cf);
593 CPpmd_State *s = STATS(c) + ns1;
594 SetSuccessor(s, successor);
595 s->Symbol = p->FoundState->Symbol;
597 c->NumStats = (UInt16)(ns1 + 1);
600 p->MaxContext = p->MinContext = CTX(fSuccessor);
603 static void Rescale(CPpmd7 *p)
605 unsigned i, adder, sumFreq, escFreq;
606 CPpmd_State *stats = STATS(p->MinContext);
607 CPpmd_State *s = p->FoundState;
609 CPpmd_State tmp = *s;
610 for (; s != stats; s--)
614 escFreq = p->MinContext->SummFreq - s->Freq;
616 adder = (p->OrderFall != 0);
617 s->Freq = (Byte)((s->Freq + adder) >> 1);
620 i = p->MinContext->NumStats - 1;
623 escFreq -= (++s)->Freq;
624 s->Freq = (Byte)((s->Freq + adder) >> 1);
626 if (s[0].Freq > s[-1].Freq)
629 CPpmd_State tmp = *s1;
632 while (--s1 != stats && tmp.Freq > s1[-1].Freq);
640 unsigned numStats = p->MinContext->NumStats;
642 do { i++; } while ((--s)->Freq == 0);
644 p->MinContext->NumStats = (UInt16)(p->MinContext->NumStats - i);
645 if (p->MinContext->NumStats == 1)
647 CPpmd_State tmp = *stats;
650 tmp.Freq = (Byte)(tmp.Freq - (tmp.Freq >> 1));
654 InsertNode(p, stats, U2I(((numStats + 1) >> 1)));
655 *(p->FoundState = ONE_STATE(p->MinContext)) = tmp;
658 n0 = (numStats + 1) >> 1;
659 n1 = (p->MinContext->NumStats + 1) >> 1;
661 p->MinContext->Stats = STATS_REF(ShrinkUnits(p, stats, n0, n1));
663 p->MinContext->SummFreq = (UInt16)(sumFreq + escFreq - (escFreq >> 1));
664 p->FoundState = STATS(p->MinContext);
667 static CPpmd_See *Ppmd7_MakeEscFreq(CPpmd7 *p, unsigned numMasked, UInt32 *escFreq)
670 unsigned nonMasked = p->MinContext->NumStats - numMasked;
671 if (p->MinContext->NumStats != 256)
673 see = p->See[p->NS2Indx[nonMasked - 1]] +
674 (nonMasked < (unsigned)SUFFIX(p->MinContext)->NumStats - p->MinContext->NumStats) +
675 2 * (p->MinContext->SummFreq < 11 * p->MinContext->NumStats) +
676 4 * (numMasked > nonMasked) +
679 unsigned r = (see->Summ >> see->Shift);
680 see->Summ = (UInt16)(see->Summ - r);
681 *escFreq = r + (r == 0);
692 static void NextContext(CPpmd7 *p)
694 CTX_PTR c = CTX(SUCCESSOR(p->FoundState));
695 if (p->OrderFall == 0 && (Byte *)c > p->Text)
696 p->MinContext = p->MaxContext = c;
701 static void Ppmd7_Update1(CPpmd7 *p)
703 CPpmd_State *s = p->FoundState;
705 p->MinContext->SummFreq += 4;
706 if (s[0].Freq > s[-1].Freq)
708 SwapStates(&s[0], &s[-1]);
710 if (s->Freq > MAX_FREQ)
716 static void Ppmd7_Update1_0(CPpmd7 *p)
718 p->PrevSuccess = (2 * p->FoundState->Freq > p->MinContext->SummFreq);
719 p->RunLength += p->PrevSuccess;
720 p->MinContext->SummFreq += 4;
721 if ((p->FoundState->Freq += 4) > MAX_FREQ)
726 static void Ppmd7_UpdateBin(CPpmd7 *p)
728 p->FoundState->Freq = (Byte)(p->FoundState->Freq + (p->FoundState->Freq < 128 ? 1: 0));
734 static void Ppmd7_Update2(CPpmd7 *p)
736 p->MinContext->SummFreq += 4;
737 if ((p->FoundState->Freq += 4) > MAX_FREQ)
739 p->RunLength = p->InitRL;
743 /* ---------- Decode ---------- */
745 static Bool Ppmd_RangeDec_Init(CPpmd7z_RangeDec *p)
748 p->Low = p->Bottom = 0;
749 p->Range = 0xFFFFFFFF;
750 for (i = 0; i < 4; i++)
751 p->Code = (p->Code << 8) | p->Stream->Read((void *)p->Stream);
752 return (p->Code < 0xFFFFFFFF);
755 static Bool Ppmd7z_RangeDec_Init(CPpmd7z_RangeDec *p)
757 if (p->Stream->Read((void *)p->Stream) != 0)
759 return Ppmd_RangeDec_Init(p);
762 static Bool PpmdRAR_RangeDec_Init(CPpmd7z_RangeDec *p)
764 if (!Ppmd_RangeDec_Init(p))
770 static UInt32 Range_GetThreshold(void *pp, UInt32 total)
772 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
773 return (p->Code - p->Low) / (p->Range /= total);
776 static void Range_Normalize(CPpmd7z_RangeDec *p)
780 if((p->Low ^ (p->Low + p->Range)) >= kTopValue)
782 if(p->Range >= p->Bottom)
785 p->Range = ((uint32_t)(-(int32_t)p->Low)) & (p->Bottom - 1);
787 p->Code = (p->Code << 8) | p->Stream->Read((void *)p->Stream);
793 static void Range_Decode_7z(void *pp, UInt32 start, UInt32 size)
795 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
796 p->Code -= start * p->Range;
801 static void Range_Decode_RAR(void *pp, UInt32 start, UInt32 size)
803 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
804 p->Low += start * p->Range;
809 static UInt32 Range_DecodeBit_7z(void *pp, UInt32 size0)
811 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
812 UInt32 newBound = (p->Range >> 14) * size0;
814 if (p->Code < newBound)
823 p->Range -= newBound;
829 static UInt32 Range_DecodeBit_RAR(void *pp, UInt32 size0)
831 CPpmd7z_RangeDec *p = (CPpmd7z_RangeDec *)pp;
832 UInt32 bit, value = p->p.GetThreshold(p, PPMD_BIN_SCALE);
836 p->p.Decode(p, 0, size0);
841 p->p.Decode(p, size0, PPMD_BIN_SCALE - size0);
846 static void Ppmd7z_RangeDec_CreateVTable(CPpmd7z_RangeDec *p)
848 p->p.GetThreshold = Range_GetThreshold;
849 p->p.Decode = Range_Decode_7z;
850 p->p.DecodeBit = Range_DecodeBit_7z;
853 static void PpmdRAR_RangeDec_CreateVTable(CPpmd7z_RangeDec *p)
855 p->p.GetThreshold = Range_GetThreshold;
856 p->p.Decode = Range_Decode_RAR;
857 p->p.DecodeBit = Range_DecodeBit_RAR;
860 #define MASK(sym) ((signed char *)charMask)[sym]
862 static int Ppmd7_DecodeSymbol(CPpmd7 *p, IPpmd7_RangeDec *rc)
864 size_t charMask[256 / sizeof(size_t)];
865 if (p->MinContext->NumStats != 1)
867 CPpmd_State *s = Ppmd7_GetStats(p, p->MinContext);
870 if ((count = rc->GetThreshold(rc, p->MinContext->SummFreq)) < (hiCnt = s->Freq))
873 rc->Decode(rc, 0, s->Freq);
880 i = p->MinContext->NumStats - 1;
883 if ((hiCnt += (++s)->Freq) > count)
886 rc->Decode(rc, hiCnt - s->Freq, s->Freq);
894 if (count >= p->MinContext->SummFreq)
896 p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol];
897 rc->Decode(rc, hiCnt, p->MinContext->SummFreq - hiCnt);
898 PPMD_SetAllBitsIn256Bytes(charMask);
900 i = p->MinContext->NumStats - 1;
901 do { MASK((--s)->Symbol) = 0; } while (--i);
905 UInt16 *prob = Ppmd7_GetBinSumm(p);
906 if (rc->DecodeBit(rc, *prob) == 0)
909 *prob = (UInt16)PPMD_UPDATE_PROB_0(*prob);
910 symbol = (p->FoundState = Ppmd7Context_OneState(p->MinContext))->Symbol;
914 *prob = (UInt16)PPMD_UPDATE_PROB_1(*prob);
915 p->InitEsc = PPMD7_kExpEscape[*prob >> 10];
916 PPMD_SetAllBitsIn256Bytes(charMask);
917 MASK(Ppmd7Context_OneState(p->MinContext)->Symbol) = 0;
922 CPpmd_State *ps[256], *s;
923 UInt32 freqSum, count, hiCnt;
925 unsigned i, num, numMasked = p->MinContext->NumStats;
929 if (!p->MinContext->Suffix)
931 p->MinContext = Ppmd7_GetContext(p, p->MinContext->Suffix);
933 while (p->MinContext->NumStats == numMasked);
935 s = Ppmd7_GetStats(p, p->MinContext);
937 num = p->MinContext->NumStats - numMasked;
940 int k = (int)(MASK(s->Symbol));
941 hiCnt += (s->Freq & k);
947 see = Ppmd7_MakeEscFreq(p, numMasked, &freqSum);
949 count = rc->GetThreshold(rc, freqSum);
954 CPpmd_State **pps = ps;
955 for (hiCnt = 0; (hiCnt += (*pps)->Freq) <= count; pps++);
957 rc->Decode(rc, hiCnt - s->Freq, s->Freq);
958 Ppmd_See_Update(see);
964 if (count >= freqSum)
966 rc->Decode(rc, hiCnt, freqSum - hiCnt);
967 see->Summ = (UInt16)(see->Summ + freqSum);
968 do { MASK(ps[--i]->Symbol) = 0; } while (i != 0);
972 /* ---------- Encode ---------- Ppmd7Enc.c */
974 #define kTopValue (1 << 24)
976 static void Ppmd7z_RangeEnc_Init(CPpmd7z_RangeEnc *p)
979 p->Range = 0xFFFFFFFF;
984 static void RangeEnc_ShiftLow(CPpmd7z_RangeEnc *p)
986 if ((UInt32)p->Low < (UInt32)0xFF000000 || (unsigned)(p->Low >> 32) != 0)
988 Byte temp = p->Cache;
991 p->Stream->Write(p->Stream, (Byte)(temp + (Byte)(p->Low >> 32)));
994 while(--p->CacheSize != 0);
995 p->Cache = (Byte)((UInt32)p->Low >> 24);
998 p->Low = ((UInt32)p->Low << 8) & 0xFFFFFFFF;
1001 static void RangeEnc_Encode(CPpmd7z_RangeEnc *p, UInt32 start, UInt32 size, UInt32 total)
1003 p->Low += (UInt64)start * (UInt64)(p->Range /= total);
1005 while (p->Range < kTopValue)
1008 RangeEnc_ShiftLow(p);
1012 static void RangeEnc_EncodeBit_0(CPpmd7z_RangeEnc *p, UInt32 size0)
1014 p->Range = (p->Range >> 14) * size0;
1015 while (p->Range < kTopValue)
1018 RangeEnc_ShiftLow(p);
1022 static void RangeEnc_EncodeBit_1(CPpmd7z_RangeEnc *p, UInt32 size0)
1024 UInt32 newBound = (p->Range >> 14) * size0;
1026 p->Range -= newBound;
1027 while (p->Range < kTopValue)
1030 RangeEnc_ShiftLow(p);
1034 static void Ppmd7z_RangeEnc_FlushData(CPpmd7z_RangeEnc *p)
1037 for (i = 0; i < 5; i++)
1038 RangeEnc_ShiftLow(p);
1042 #define MASK(sym) ((signed char *)charMask)[sym]
1044 static void Ppmd7_EncodeSymbol(CPpmd7 *p, CPpmd7z_RangeEnc *rc, int symbol)
1046 size_t charMask[256 / sizeof(size_t)];
1047 if (p->MinContext->NumStats != 1)
1049 CPpmd_State *s = Ppmd7_GetStats(p, p->MinContext);
1052 if (s->Symbol == symbol)
1054 RangeEnc_Encode(rc, 0, s->Freq, p->MinContext->SummFreq);
1061 i = p->MinContext->NumStats - 1;
1064 if ((++s)->Symbol == symbol)
1066 RangeEnc_Encode(rc, sum, s->Freq, p->MinContext->SummFreq);
1075 p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol];
1076 PPMD_SetAllBitsIn256Bytes(charMask);
1077 MASK(s->Symbol) = 0;
1078 i = p->MinContext->NumStats - 1;
1079 do { MASK((--s)->Symbol) = 0; } while (--i);
1080 RangeEnc_Encode(rc, sum, p->MinContext->SummFreq - sum, p->MinContext->SummFreq);
1084 UInt16 *prob = Ppmd7_GetBinSumm(p);
1085 CPpmd_State *s = Ppmd7Context_OneState(p->MinContext);
1086 if (s->Symbol == symbol)
1088 RangeEnc_EncodeBit_0(rc, *prob);
1089 *prob = (UInt16)PPMD_UPDATE_PROB_0(*prob);
1096 RangeEnc_EncodeBit_1(rc, *prob);
1097 *prob = (UInt16)PPMD_UPDATE_PROB_1(*prob);
1098 p->InitEsc = PPMD7_kExpEscape[*prob >> 10];
1099 PPMD_SetAllBitsIn256Bytes(charMask);
1100 MASK(s->Symbol) = 0;
1110 unsigned i, numMasked = p->MinContext->NumStats;
1114 if (!p->MinContext->Suffix)
1115 return; /* EndMarker (symbol = -1) */
1116 p->MinContext = Ppmd7_GetContext(p, p->MinContext->Suffix);
1118 while (p->MinContext->NumStats == numMasked);
1120 see = Ppmd7_MakeEscFreq(p, numMasked, &escFreq);
1121 s = Ppmd7_GetStats(p, p->MinContext);
1123 i = p->MinContext->NumStats;
1126 int cur = s->Symbol;
1130 CPpmd_State *s1 = s;
1133 sum += (s->Freq & (int)(MASK(s->Symbol)));
1137 RangeEnc_Encode(rc, low, s1->Freq, sum + escFreq);
1138 Ppmd_See_Update(see);
1143 sum += (s->Freq & (int)(MASK(cur)));
1149 RangeEnc_Encode(rc, sum, escFreq, sum + escFreq);
1150 see->Summ = (UInt16)(see->Summ + sum + escFreq);
1154 const IPpmd7 __archive_ppmd7_functions =
1160 &Ppmd7z_RangeDec_CreateVTable,
1161 &PpmdRAR_RangeDec_CreateVTable,
1162 &Ppmd7z_RangeDec_Init,
1163 &PpmdRAR_RangeDec_Init,
1164 &Ppmd7_DecodeSymbol,
1165 &Ppmd7z_RangeEnc_Init,
1166 &Ppmd7z_RangeEnc_FlushData,