diff options
Diffstat (limited to 'src/libs/7zip/unix/C/Ppmd8.c')
-rw-r--r-- | src/libs/7zip/unix/C/Ppmd8.c | 1120 |
1 files changed, 0 insertions, 1120 deletions
diff --git a/src/libs/7zip/unix/C/Ppmd8.c b/src/libs/7zip/unix/C/Ppmd8.c deleted file mode 100644 index 9187a88ef..000000000 --- a/src/libs/7zip/unix/C/Ppmd8.c +++ /dev/null @@ -1,1120 +0,0 @@ -/* Ppmd8.c -- PPMdI codec -2010-03-24 : Igor Pavlov : Public domain -This code is based on PPMd var.I (2002): Dmitry Shkarin : Public domain */ - -#include <memory.h> - -#include "Ppmd8.h" - -const Byte PPMD8_kExpEscape[16] = { 25, 14, 9, 7, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2 }; -static const UInt16 kInitBinEsc[] = { 0x3CDD, 0x1F3F, 0x59BF, 0x48F3, 0x64A1, 0x5ABC, 0x6632, 0x6051}; - -#define MAX_FREQ 124 -#define UNIT_SIZE 12 - -#define U2B(nu) ((UInt32)(nu) * UNIT_SIZE) -#define U2I(nu) (p->Units2Indx[(nu) - 1]) -#define I2U(indx) (p->Indx2Units[indx]) - -#ifdef PPMD_32BIT - #define REF(ptr) (ptr) -#else - #define REF(ptr) ((UInt32)((Byte *)(ptr) - (p)->Base)) -#endif - -#define STATS_REF(ptr) ((CPpmd_State_Ref)REF(ptr)) - -#define CTX(ref) ((CPpmd8_Context *)Ppmd8_GetContext(p, ref)) -#define STATS(ctx) Ppmd8_GetStats(p, ctx) -#define ONE_STATE(ctx) Ppmd8Context_OneState(ctx) -#define SUFFIX(ctx) CTX((ctx)->Suffix) - -typedef CPpmd8_Context * CTX_PTR; - -struct CPpmd8_Node_; - -typedef - #ifdef PPMD_32BIT - struct CPpmd8_Node_ * - #else - UInt32 - #endif - CPpmd8_Node_Ref; - -typedef struct CPpmd8_Node_ -{ - UInt32 Stamp; - CPpmd8_Node_Ref Next; - UInt32 NU; -} CPpmd8_Node; - -#ifdef PPMD_32BIT - #define NODE(ptr) (ptr) -#else - #define NODE(offs) ((CPpmd8_Node *)(p->Base + (offs))) -#endif - -#define EMPTY_NODE 0xFFFFFFFF - -void Ppmd8_Construct(CPpmd8 *p) -{ - unsigned i, k, m; - - p->Base = 0; - - for (i = 0, k = 0; i < PPMD_NUM_INDEXES; i++) - { - unsigned step = (i >= 12 ? 4 : (i >> 2) + 1); - do { p->Units2Indx[k++] = (Byte)i; } while(--step); - p->Indx2Units[i] = (Byte)k; - } - - p->NS2BSIndx[0] = (0 << 1); - p->NS2BSIndx[1] = (1 << 1); - memset(p->NS2BSIndx + 2, (2 << 1), 9); - memset(p->NS2BSIndx + 11, (3 << 1), 256 - 11); - - for (i = 0; i < 5; i++) - p->NS2Indx[i] = (Byte)i; - for (m = i, k = 1; i < 260; i++) - { - p->NS2Indx[i] = (Byte)m; - if (--k == 0) - k = (++m) - 4; - } -} - -void Ppmd8_Free(CPpmd8 *p, ISzAlloc *alloc) -{ - alloc->Free(alloc, p->Base); - p->Size = 0; - p->Base = 0; -} - -Bool Ppmd8_Alloc(CPpmd8 *p, UInt32 size, ISzAlloc *alloc) -{ - if (p->Base == 0 || p->Size != size) - { - Ppmd8_Free(p, alloc); - p->AlignOffset = - #ifdef PPMD_32BIT - (4 - size) & 3; - #else - 4 - (size & 3); - #endif - if ((p->Base = (Byte *)alloc->Alloc(alloc, p->AlignOffset + size)) == 0) - return False; - p->Size = size; - } - return True; -} - -static void InsertNode(CPpmd8 *p, void *node, unsigned indx) -{ - ((CPpmd8_Node *)node)->Stamp = EMPTY_NODE; - ((CPpmd8_Node *)node)->Next = (CPpmd8_Node_Ref)p->FreeList[indx]; - ((CPpmd8_Node *)node)->NU = I2U(indx); - p->FreeList[indx] = REF(node); - p->Stamps[indx]++; -} - -static void *RemoveNode(CPpmd8 *p, unsigned indx) -{ - CPpmd8_Node *node = NODE((CPpmd8_Node_Ref)p->FreeList[indx]); - p->FreeList[indx] = node->Next; - p->Stamps[indx]--; - return node; -} - -static void SplitBlock(CPpmd8 *p, void *ptr, unsigned oldIndx, unsigned newIndx) -{ - unsigned i, nu = I2U(oldIndx) - I2U(newIndx); - ptr = (Byte *)ptr + U2B(I2U(newIndx)); - if (I2U(i = U2I(nu)) != nu) - { - unsigned k = I2U(--i); - InsertNode(p, ((Byte *)ptr) + U2B(k), nu - k - 1); - } - InsertNode(p, ptr, i); -} - -static void GlueFreeBlocks(CPpmd8 *p) -{ - CPpmd8_Node_Ref head = 0; - CPpmd8_Node_Ref *prev = &head; - unsigned i; - - p->GlueCount = 1 << 13; - memset(p->Stamps, 0, sizeof(p->Stamps)); - - /* Order-0 context is always at top UNIT, so we don't need guard NODE at the end. - All blocks up to p->LoUnit can be free, so we need guard NODE at LoUnit. */ - if (p->LoUnit != p->HiUnit) - ((CPpmd8_Node *)p->LoUnit)->Stamp = 0; - - /* Glue free blocks */ - for (i = 0; i < PPMD_NUM_INDEXES; i++) - { - CPpmd8_Node_Ref next = (CPpmd8_Node_Ref)p->FreeList[i]; - p->FreeList[i] = 0; - while (next != 0) - { - CPpmd8_Node *node = NODE(next); - if (node->NU != 0) - { - CPpmd8_Node *node2; - *prev = next; - prev = &(node->Next); - while ((node2 = node + node->NU)->Stamp == EMPTY_NODE) - { - node->NU += node2->NU; - node2->NU = 0; - } - } - next = node->Next; - } - } - *prev = 0; - - /* Fill lists of free blocks */ - while (head != 0) - { - CPpmd8_Node *node = NODE(head); - unsigned nu; - head = node->Next; - nu = node->NU; - if (nu == 0) - continue; - for (; nu > 128; nu -= 128, node += 128) - InsertNode(p, node, PPMD_NUM_INDEXES - 1); - if (I2U(i = U2I(nu)) != nu) - { - unsigned k = I2U(--i); - InsertNode(p, node + k, nu - k - 1); - } - InsertNode(p, node, i); - } -} - -static void *AllocUnitsRare(CPpmd8 *p, unsigned indx) -{ - unsigned i; - void *retVal; - if (p->GlueCount == 0) - { - GlueFreeBlocks(p); - if (p->FreeList[indx] != 0) - return RemoveNode(p, indx); - } - i = indx; - do - { - if (++i == PPMD_NUM_INDEXES) - { - UInt32 numBytes = U2B(I2U(indx)); - p->GlueCount--; - return ((UInt32)(p->UnitsStart - p->Text) > numBytes) ? (p->UnitsStart -= numBytes) : (NULL); - } - } - while (p->FreeList[i] == 0); - retVal = RemoveNode(p, i); - SplitBlock(p, retVal, i, indx); - return retVal; -} - -static void *AllocUnits(CPpmd8 *p, unsigned indx) -{ - UInt32 numBytes; - if (p->FreeList[indx] != 0) - return RemoveNode(p, indx); - numBytes = U2B(I2U(indx)); - if (numBytes <= (UInt32)(p->HiUnit - p->LoUnit)) - { - void *retVal = p->LoUnit; - p->LoUnit += numBytes; - return retVal; - } - return AllocUnitsRare(p, indx); -} - -#define MyMem12Cpy(dest, src, num) \ - { UInt32 *d = (UInt32 *)dest; const UInt32 *s = (const UInt32 *)src; UInt32 n = num; \ - do { d[0] = s[0]; d[1] = s[1]; d[2] = s[2]; s += 3; d += 3; } while(--n); } - -static void *ShrinkUnits(CPpmd8 *p, void *oldPtr, unsigned oldNU, unsigned newNU) -{ - unsigned i0 = U2I(oldNU); - unsigned i1 = U2I(newNU); - if (i0 == i1) - return oldPtr; - if (p->FreeList[i1] != 0) - { - void *ptr = RemoveNode(p, i1); - MyMem12Cpy(ptr, oldPtr, newNU); - InsertNode(p, oldPtr, i0); - return ptr; - } - SplitBlock(p, oldPtr, i0, i1); - return oldPtr; -} - -static void FreeUnits(CPpmd8 *p, void *ptr, unsigned nu) -{ - InsertNode(p, ptr, U2I(nu)); -} - -static void SpecialFreeUnit(CPpmd8 *p, void *ptr) -{ - if ((Byte *)ptr != p->UnitsStart) - InsertNode(p, ptr, 0); - else - { - #ifdef PPMD8_FREEZE_SUPPORT - *(UInt32 *)ptr = EMPTY_NODE; /* it's used for (Flags == 0xFF) check in RemoveBinContexts */ - #endif - p->UnitsStart += UNIT_SIZE; - } -} - -static void *MoveUnitsUp(CPpmd8 *p, void *oldPtr, unsigned nu) -{ - unsigned indx = U2I(nu); - void *ptr; - if ((Byte *)oldPtr > p->UnitsStart + 16 * 1024 || REF(oldPtr) > p->FreeList[indx]) - return oldPtr; - ptr = RemoveNode(p, indx); - MyMem12Cpy(ptr, oldPtr, nu); - if ((Byte*)oldPtr != p->UnitsStart) - InsertNode(p, oldPtr, indx); - else - p->UnitsStart += U2B(I2U(indx)); - return ptr; -} - -static void ExpandTextArea(CPpmd8 *p) -{ - UInt32 count[PPMD_NUM_INDEXES]; - unsigned i; - memset(count, 0, sizeof(count)); - if (p->LoUnit != p->HiUnit) - ((CPpmd8_Node *)p->LoUnit)->Stamp = 0; - - { - CPpmd8_Node *node = (CPpmd8_Node *)p->UnitsStart; - for (; node->Stamp == EMPTY_NODE; node += node->NU) - { - node->Stamp = 0; - count[U2I(node->NU)]++; - } - p->UnitsStart = (Byte *)node; - } - - for (i = 0; i < PPMD_NUM_INDEXES; i++) - { - CPpmd8_Node_Ref *next = (CPpmd8_Node_Ref *)&p->FreeList[i]; - while (count[i] != 0) - { - CPpmd8_Node *node = NODE(*next); - while (node->Stamp == 0) - { - *next = node->Next; - node = NODE(*next); - p->Stamps[i]--; - if (--count[i] == 0) - break; - } - next = &node->Next; - } - } -} - -#define SUCCESSOR(p) ((CPpmd_Void_Ref)((p)->SuccessorLow | ((UInt32)(p)->SuccessorHigh << 16))) - -static void SetSuccessor(CPpmd_State *p, CPpmd_Void_Ref v) -{ - (p)->SuccessorLow = (UInt16)((UInt32)(v) & 0xFFFF); - (p)->SuccessorHigh = (UInt16)(((UInt32)(v) >> 16) & 0xFFFF); -} - -#define RESET_TEXT(offs) { p->Text = p->Base + p->AlignOffset + (offs); } - -static void RestartModel(CPpmd8 *p) -{ - unsigned i, k, m, r; - - memset(p->FreeList, 0, sizeof(p->FreeList)); - memset(p->Stamps, 0, sizeof(p->Stamps)); - RESET_TEXT(0); - p->HiUnit = p->Text + p->Size; - p->LoUnit = p->UnitsStart = p->HiUnit - p->Size / 8 / UNIT_SIZE * 7 * UNIT_SIZE; - p->GlueCount = 0; - - p->OrderFall = p->MaxOrder; - p->RunLength = p->InitRL = -(Int32)((p->MaxOrder < 12) ? p->MaxOrder : 12) - 1; - p->PrevSuccess = 0; - - p->MinContext = p->MaxContext = (CTX_PTR)(p->HiUnit -= UNIT_SIZE); /* AllocContext(p); */ - p->MinContext->Suffix = 0; - p->MinContext->NumStats = 255; - p->MinContext->Flags = 0; - p->MinContext->SummFreq = 256 + 1; - p->FoundState = (CPpmd_State *)p->LoUnit; /* AllocUnits(p, PPMD_NUM_INDEXES - 1); */ - p->LoUnit += U2B(256 / 2); - p->MinContext->Stats = REF(p->FoundState); - for (i = 0; i < 256; i++) - { - CPpmd_State *s = &p->FoundState[i]; - s->Symbol = (Byte)i; - s->Freq = 1; - SetSuccessor(s, 0); - } - - for (i = m = 0; m < 25; m++) - { - while (p->NS2Indx[i] == m) - i++; - for (k = 0; k < 8; k++) - { - UInt16 val = (UInt16)(PPMD_BIN_SCALE - kInitBinEsc[k] / (i + 1)); - UInt16 *dest = p->BinSumm[m] + k; - for (r = 0; r < 64; r += 8) - dest[r] = val; - } - } - - for (i = m = 0; m < 24; m++) - { - while (p->NS2Indx[i + 3] == m + 3) - i++; - for (k = 0; k < 32; k++) - { - CPpmd_See *s = &p->See[m][k]; - s->Summ = (UInt16)((2 * i + 5) << (s->Shift = PPMD_PERIOD_BITS - 4)); - s->Count = 7; - } - } -} - -void Ppmd8_Init(CPpmd8 *p, unsigned maxOrder, unsigned restoreMethod) -{ - p->MaxOrder = maxOrder; - p->RestoreMethod = restoreMethod; - RestartModel(p); - p->DummySee.Shift = PPMD_PERIOD_BITS; - p->DummySee.Summ = 0; /* unused */ - p->DummySee.Count = 64; /* unused */ -} - -static void Refresh(CPpmd8 *p, CTX_PTR ctx, unsigned oldNU, unsigned scale) -{ - unsigned i = ctx->NumStats, escFreq, sumFreq, flags; - CPpmd_State *s = (CPpmd_State *)ShrinkUnits(p, STATS(ctx), oldNU, (i + 2) >> 1); - ctx->Stats = REF(s); - #ifdef PPMD8_FREEZE_SUPPORT - /* fixed over Shkarin's code. Fixed code is not compatible with original code for some files in FREEZE mode. */ - scale |= (ctx->SummFreq >= ((UInt32)1 << 15)); - #endif - flags = (ctx->Flags & (0x10 + 0x04 * scale)) + 0x08 * (s->Symbol >= 0x40); - escFreq = ctx->SummFreq - s->Freq; - sumFreq = (s->Freq = (Byte)((s->Freq + scale) >> scale)); - do - { - escFreq -= (++s)->Freq; - sumFreq += (s->Freq = (Byte)((s->Freq + scale) >> scale)); - flags |= 0x08 * (s->Symbol >= 0x40); - } - while (--i); - ctx->SummFreq = (UInt16)(sumFreq + ((escFreq + scale) >> scale)); - ctx->Flags = (Byte)flags; -} - -static void SwapStates(CPpmd_State *t1, CPpmd_State *t2) -{ - CPpmd_State tmp = *t1; - *t1 = *t2; - *t2 = tmp; -} - -static CPpmd_Void_Ref CutOff(CPpmd8 *p, CTX_PTR ctx, unsigned order) -{ - int i; - unsigned tmp; - CPpmd_State *s; - - if (!ctx->NumStats) - { - s = ONE_STATE(ctx); - if ((Byte *)Ppmd8_GetPtr(p, SUCCESSOR(s)) >= p->UnitsStart) - { - if (order < p->MaxOrder) - SetSuccessor(s, CutOff(p, CTX(SUCCESSOR(s)), order + 1)); - else - SetSuccessor(s, 0); - if (SUCCESSOR(s) || order <= 9) /* O_BOUND */ - return REF(ctx); - } - SpecialFreeUnit(p, ctx); - return 0; - } - - ctx->Stats = STATS_REF(MoveUnitsUp(p, STATS(ctx), tmp = ((unsigned)ctx->NumStats + 2) >> 1)); - - for (s = STATS(ctx) + (i = ctx->NumStats); s >= STATS(ctx); s--) - if ((Byte *)Ppmd8_GetPtr(p, SUCCESSOR(s)) < p->UnitsStart) - { - CPpmd_State *s2 = STATS(ctx) + (i--); - SetSuccessor(s, 0); - SwapStates(s, s2); - } - else if (order < p->MaxOrder) - SetSuccessor(s, CutOff(p, CTX(SUCCESSOR(s)), order + 1)); - else - SetSuccessor(s, 0); - - if (i != ctx->NumStats && order) - { - ctx->NumStats = (Byte)i; - s = STATS(ctx); - if (i < 0) - { - FreeUnits(p, s, tmp); - SpecialFreeUnit(p, ctx); - return 0; - } - if (i == 0) - { - ctx->Flags = (ctx->Flags & 0x10) + 0x08 * (s->Symbol >= 0x40); - *ONE_STATE(ctx) = *s; - FreeUnits(p, s, tmp); - ONE_STATE(ctx)->Freq = (Byte)((unsigned)ONE_STATE(ctx)->Freq + 11) >> 3; - } - else - Refresh(p, ctx, tmp, ctx->SummFreq > 16 * i); - } - return REF(ctx); -} - -#ifdef PPMD8_FREEZE_SUPPORT -static CPpmd_Void_Ref RemoveBinContexts(CPpmd8 *p, CTX_PTR ctx, unsigned order) -{ - CPpmd_State *s; - if (!ctx->NumStats) - { - s = ONE_STATE(ctx); - if ((Byte *)Ppmd8_GetPtr(p, SUCCESSOR(s)) >= p->UnitsStart && order < p->MaxOrder) - SetSuccessor(s, RemoveBinContexts(p, CTX(SUCCESSOR(s)), order + 1)); - else - SetSuccessor(s, 0); - /* Suffix context can be removed already, since different (high-order) - Successors may refer to same context. So we check Flags == 0xFF (Stamp == EMPTY_NODE) */ - if (!SUCCESSOR(s) && (!SUFFIX(ctx)->NumStats || SUFFIX(ctx)->Flags == 0xFF)) - { - FreeUnits(p, ctx, 1); - return 0; - } - else - return REF(ctx); - } - - for (s = STATS(ctx) + ctx->NumStats; s >= STATS(ctx); s--) - if ((Byte *)Ppmd8_GetPtr(p, SUCCESSOR(s)) >= p->UnitsStart && order < p->MaxOrder) - SetSuccessor(s, RemoveBinContexts(p, CTX(SUCCESSOR(s)), order + 1)); - else - SetSuccessor(s, 0); - - return REF(ctx); -} -#endif - -static UInt32 GetUsedMemory(const CPpmd8 *p) -{ - UInt32 v = 0; - unsigned i; - for (i = 0; i < PPMD_NUM_INDEXES; i++) - v += p->Stamps[i] * I2U(i); - return p->Size - (UInt32)(p->HiUnit - p->LoUnit) - (UInt32)(p->UnitsStart - p->Text) - U2B(v); -} - -#ifdef PPMD8_FREEZE_SUPPORT - #define RESTORE_MODEL(c1, fSuccessor) RestoreModel(p, c1, fSuccessor) -#else - #define RESTORE_MODEL(c1, fSuccessor) RestoreModel(p, c1) -#endif - -static void RestoreModel(CPpmd8 *p, CTX_PTR c1 - #ifdef PPMD8_FREEZE_SUPPORT - , CTX_PTR fSuccessor - #endif - ) -{ - CTX_PTR c; - CPpmd_State *s; - RESET_TEXT(0); - for (c = p->MaxContext; c != c1; c = SUFFIX(c)) - if (--(c->NumStats) == 0) - { - s = STATS(c); - c->Flags = (c->Flags & 0x10) + 0x08 * (s->Symbol >= 0x40); - *ONE_STATE(c) = *s; - SpecialFreeUnit(p, s); - ONE_STATE(c)->Freq = (ONE_STATE(c)->Freq + 11) >> 3; - } - else - Refresh(p, c, (c->NumStats+3) >> 1, 0); - - for (; c != p->MinContext; c = SUFFIX(c)) - if (!c->NumStats) - ONE_STATE(c)->Freq -= ONE_STATE(c)->Freq >> 1; - else if ((c->SummFreq += 4) > 128 + 4 * c->NumStats) - Refresh(p, c, (c->NumStats + 2) >> 1, 1); - - #ifdef PPMD8_FREEZE_SUPPORT - if (p->RestoreMethod > PPMD8_RESTORE_METHOD_FREEZE) - { - p->MaxContext = fSuccessor; - p->GlueCount += !(p->Stamps[1] & 1); - } - else if (p->RestoreMethod == PPMD8_RESTORE_METHOD_FREEZE) - { - while (p->MaxContext->Suffix) - p->MaxContext = SUFFIX(p->MaxContext); - RemoveBinContexts(p, p->MaxContext, 0); - p->RestoreMethod++; - p->GlueCount = 0; - p->OrderFall = p->MaxOrder; - } - else - #endif - if (p->RestoreMethod == PPMD8_RESTORE_METHOD_RESTART || GetUsedMemory(p) < (p->Size >> 1)) - RestartModel(p); - else - { - while (p->MaxContext->Suffix) - p->MaxContext = SUFFIX(p->MaxContext); - do - { - CutOff(p, p->MaxContext, 0); - ExpandTextArea(p); - } - while (GetUsedMemory(p) > 3 * (p->Size >> 2)); - p->GlueCount = 0; - p->OrderFall = p->MaxOrder; - } -} - -static CTX_PTR CreateSuccessors(CPpmd8 *p, Bool skip, CPpmd_State *s1, CTX_PTR c) -{ - CPpmd_State upState; - Byte flags; - CPpmd_Byte_Ref upBranch = (CPpmd_Byte_Ref)SUCCESSOR(p->FoundState); - /* fixed over Shkarin's code. Maybe it could work without + 1 too. */ - CPpmd_State *ps[PPMD8_MAX_ORDER + 1]; - unsigned numPs = 0; - - if (!skip) - ps[numPs++] = p->FoundState; - - while (c->Suffix) - { - CPpmd_Void_Ref successor; - CPpmd_State *s; - c = SUFFIX(c); - if (s1) - { - s = s1; - s1 = NULL; - } - else if (c->NumStats != 0) - { - for (s = STATS(c); s->Symbol != p->FoundState->Symbol; s++); - if (s->Freq < MAX_FREQ - 9) - { - s->Freq++; - c->SummFreq++; - } - } - else - { - s = ONE_STATE(c); - s->Freq += (!SUFFIX(c)->NumStats & (s->Freq < 24)); - } - successor = SUCCESSOR(s); - if (successor != upBranch) - { - c = CTX(successor); - if (numPs == 0) - return c; - break; - } - ps[numPs++] = s; - } - - upState.Symbol = *(const Byte *)Ppmd8_GetPtr(p, upBranch); - SetSuccessor(&upState, upBranch + 1); - flags = 0x10 * (p->FoundState->Symbol >= 0x40) + 0x08 * (upState.Symbol >= 0x40); - - if (c->NumStats == 0) - upState.Freq = ONE_STATE(c)->Freq; - else - { - UInt32 cf, s0; - CPpmd_State *s; - for (s = STATS(c); s->Symbol != upState.Symbol; s++); - cf = s->Freq - 1; - s0 = c->SummFreq - c->NumStats - cf; - upState.Freq = (Byte)(1 + ((2 * cf <= s0) ? (5 * cf > s0) : ((cf + 2 * s0 - 3) / s0))); - } - - do - { - /* Create Child */ - CTX_PTR c1; /* = AllocContext(p); */ - if (p->HiUnit != p->LoUnit) - c1 = (CTX_PTR)(p->HiUnit -= UNIT_SIZE); - else if (p->FreeList[0] != 0) - c1 = (CTX_PTR)RemoveNode(p, 0); - else - { - c1 = (CTX_PTR)AllocUnitsRare(p, 0); - if (!c1) - return NULL; - } - c1->NumStats = 0; - c1->Flags = flags; - *ONE_STATE(c1) = upState; - c1->Suffix = REF(c); - SetSuccessor(ps[--numPs], REF(c1)); - c = c1; - } - while (numPs != 0); - - return c; -} - -static CTX_PTR ReduceOrder(CPpmd8 *p, CPpmd_State *s1, CTX_PTR c) -{ - CPpmd_State *s = NULL; - CTX_PTR c1 = c; - CPpmd_Void_Ref upBranch = REF(p->Text); - - #ifdef PPMD8_FREEZE_SUPPORT - /* The BUG in Shkarin's code was fixed: ps could overflow in CUT_OFF mode. */ - CPpmd_State *ps[PPMD8_MAX_ORDER + 1]; - unsigned numPs = 0; - ps[numPs++] = p->FoundState; - #endif - - SetSuccessor(p->FoundState, upBranch); - p->OrderFall++; - - for (;;) - { - if (s1) - { - c = SUFFIX(c); - s = s1; - s1 = NULL; - } - else - { - if (!c->Suffix) - { - #ifdef PPMD8_FREEZE_SUPPORT - if (p->RestoreMethod > PPMD8_RESTORE_METHOD_FREEZE) - { - do { SetSuccessor(ps[--numPs], REF(c)); } while (numPs); - RESET_TEXT(1); - p->OrderFall = 1; - } - #endif - return c; - } - c = SUFFIX(c); - if (c->NumStats) - { - if ((s = STATS(c))->Symbol != p->FoundState->Symbol) - do { s++; } while (s->Symbol != p->FoundState->Symbol); - if (s->Freq < MAX_FREQ - 9) - { - s->Freq += 2; - c->SummFreq += 2; - } - } - else - { - s = ONE_STATE(c); - s->Freq += (s->Freq < 32); - } - } - if (SUCCESSOR(s)) - break; - #ifdef PPMD8_FREEZE_SUPPORT - ps[numPs++] = s; - #endif - SetSuccessor(s, upBranch); - p->OrderFall++; - } - - #ifdef PPMD8_FREEZE_SUPPORT - if (p->RestoreMethod > PPMD8_RESTORE_METHOD_FREEZE) - { - c = CTX(SUCCESSOR(s)); - do { SetSuccessor(ps[--numPs], REF(c)); } while (numPs); - RESET_TEXT(1); - p->OrderFall = 1; - return c; - } - else - #endif - if (SUCCESSOR(s) <= upBranch) - { - CTX_PTR successor; - CPpmd_State *s1 = p->FoundState; - p->FoundState = s; - - successor = CreateSuccessors(p, False, NULL, c); - if (successor == NULL) - SetSuccessor(s, 0); - else - SetSuccessor(s, REF(successor)); - p->FoundState = s1; - } - - if (p->OrderFall == 1 && c1 == p->MaxContext) - { - SetSuccessor(p->FoundState, SUCCESSOR(s)); - p->Text--; - } - if (SUCCESSOR(s) == 0) - return NULL; - return CTX(SUCCESSOR(s)); -} - -static void UpdateModel(CPpmd8 *p) -{ - CPpmd_Void_Ref successor, fSuccessor = SUCCESSOR(p->FoundState); - CTX_PTR c; - unsigned s0, ns, fFreq = p->FoundState->Freq; - Byte flag, fSymbol = p->FoundState->Symbol; - CPpmd_State *s = NULL; - - if (p->FoundState->Freq < MAX_FREQ / 4 && p->MinContext->Suffix != 0) - { - c = SUFFIX(p->MinContext); - - if (c->NumStats == 0) - { - s = ONE_STATE(c); - if (s->Freq < 32) - s->Freq++; - } - else - { - s = STATS(c); - if (s->Symbol != p->FoundState->Symbol) - { - do { s++; } while (s->Symbol != p->FoundState->Symbol); - if (s[0].Freq >= s[-1].Freq) - { - SwapStates(&s[0], &s[-1]); - s--; - } - } - if (s->Freq < MAX_FREQ - 9) - { - s->Freq += 2; - c->SummFreq += 2; - } - } - } - - c = p->MaxContext; - if (p->OrderFall == 0 && fSuccessor) - { - CTX_PTR cs = CreateSuccessors(p, True, s, p->MinContext); - if (cs == 0) - { - SetSuccessor(p->FoundState, 0); - RESTORE_MODEL(c, CTX(fSuccessor)); - } - else - { - SetSuccessor(p->FoundState, REF(cs)); - p->MaxContext = cs; - } - return; - } - - *p->Text++ = p->FoundState->Symbol; - successor = REF(p->Text); - if (p->Text >= p->UnitsStart) - { - RESTORE_MODEL(c, CTX(fSuccessor)); /* check it */ - return; - } - - if (!fSuccessor) - { - CTX_PTR cs = ReduceOrder(p, s, p->MinContext); - if (cs == NULL) - { - RESTORE_MODEL(c, 0); - return; - } - fSuccessor = REF(cs); - } - else if ((Byte *)Ppmd8_GetPtr(p, fSuccessor) < p->UnitsStart) - { - CTX_PTR cs = CreateSuccessors(p, False, s, p->MinContext); - if (cs == NULL) - { - RESTORE_MODEL(c, 0); - return; - } - fSuccessor = REF(cs); - } - - if (--p->OrderFall == 0) - { - successor = fSuccessor; - p->Text -= (p->MaxContext != p->MinContext); - } - #ifdef PPMD8_FREEZE_SUPPORT - else if (p->RestoreMethod > PPMD8_RESTORE_METHOD_FREEZE) - { - successor = fSuccessor; - RESET_TEXT(0); - p->OrderFall = 0; - } - #endif - - s0 = p->MinContext->SummFreq - (ns = p->MinContext->NumStats) - fFreq; - flag = 0x08 * (fSymbol >= 0x40); - - for (; c != p->MinContext; c = SUFFIX(c)) - { - unsigned ns1; - UInt32 cf, sf; - if ((ns1 = c->NumStats) != 0) - { - if ((ns1 & 1) != 0) - { - /* Expand for one UNIT */ - unsigned oldNU = (ns1 + 1) >> 1; - unsigned i = U2I(oldNU); - if (i != U2I(oldNU + 1)) - { - void *ptr = AllocUnits(p, i + 1); - void *oldPtr; - if (!ptr) - { - RESTORE_MODEL(c, CTX(fSuccessor)); - return; - } - oldPtr = STATS(c); - MyMem12Cpy(ptr, oldPtr, oldNU); - InsertNode(p, oldPtr, i); - c->Stats = STATS_REF(ptr); - } - } - c->SummFreq = (UInt16)(c->SummFreq + (3 * ns1 + 1 < ns)); - } - else - { - CPpmd_State *s = (CPpmd_State*)AllocUnits(p, 0); - if (!s) - { - RESTORE_MODEL(c, CTX(fSuccessor)); - return; - } - *s = *ONE_STATE(c); - c->Stats = REF(s); - if (s->Freq < MAX_FREQ / 4 - 1) - s->Freq <<= 1; - else - s->Freq = MAX_FREQ - 4; - c->SummFreq = (UInt16)(s->Freq + p->InitEsc + (ns > 2)); - } - cf = 2 * fFreq * (c->SummFreq + 6); - sf = (UInt32)s0 + c->SummFreq; - if (cf < 6 * sf) - { - cf = 1 + (cf > sf) + (cf >= 4 * sf); - c->SummFreq += 4; - } - else - { - cf = 4 + (cf > 9 * sf) + (cf > 12 * sf) + (cf > 15 * sf); - c->SummFreq = (UInt16)(c->SummFreq + cf); - } - { - CPpmd_State *s = STATS(c) + ns1 + 1; - SetSuccessor(s, successor); - s->Symbol = fSymbol; - s->Freq = (Byte)cf; - c->Flags |= flag; - c->NumStats = (Byte)(ns1 + 1); - } - } - p->MaxContext = p->MinContext = CTX(fSuccessor); -} - -static void Rescale(CPpmd8 *p) -{ - unsigned i, adder, sumFreq, escFreq; - CPpmd_State *stats = STATS(p->MinContext); - CPpmd_State *s = p->FoundState; - { - CPpmd_State tmp = *s; - for (; s != stats; s--) - s[0] = s[-1]; - *s = tmp; - } - escFreq = p->MinContext->SummFreq - s->Freq; - s->Freq += 4; - adder = (p->OrderFall != 0 - #ifdef PPMD8_FREEZE_SUPPORT - || p->RestoreMethod > PPMD8_RESTORE_METHOD_FREEZE - #endif - ); - s->Freq = (Byte)((s->Freq + adder) >> 1); - sumFreq = s->Freq; - - i = p->MinContext->NumStats; - do - { - escFreq -= (++s)->Freq; - s->Freq = (Byte)((s->Freq + adder) >> 1); - sumFreq += s->Freq; - if (s[0].Freq > s[-1].Freq) - { - CPpmd_State *s1 = s; - CPpmd_State tmp = *s1; - do - s1[0] = s1[-1]; - while (--s1 != stats && tmp.Freq > s1[-1].Freq); - *s1 = tmp; - } - } - while (--i); - - if (s->Freq == 0) - { - unsigned numStats = p->MinContext->NumStats; - unsigned n0, n1; - do { i++; } while ((--s)->Freq == 0); - escFreq += i; - p->MinContext->NumStats = (Byte)(p->MinContext->NumStats - i); - if (p->MinContext->NumStats == 0) - { - CPpmd_State tmp = *stats; - tmp.Freq = (Byte)((2 * tmp.Freq + escFreq - 1) / escFreq); - if (tmp.Freq > MAX_FREQ / 3) - tmp.Freq = MAX_FREQ / 3; - InsertNode(p, stats, U2I((numStats + 2) >> 1)); - p->MinContext->Flags = (p->MinContext->Flags & 0x10) + 0x08 * (tmp.Symbol >= 0x40); - *(p->FoundState = ONE_STATE(p->MinContext)) = tmp; - return; - } - n0 = (numStats + 2) >> 1; - n1 = (p->MinContext->NumStats + 2) >> 1; - if (n0 != n1) - p->MinContext->Stats = STATS_REF(ShrinkUnits(p, stats, n0, n1)); - p->MinContext->Flags &= ~0x08; - p->MinContext->Flags |= 0x08 * ((s = STATS(p->MinContext))->Symbol >= 0x40); - i = p->MinContext->NumStats; - do { p->MinContext->Flags |= 0x08*((++s)->Symbol >= 0x40); } while (--i); - } - p->MinContext->SummFreq = (UInt16)(sumFreq + escFreq - (escFreq >> 1)); - p->MinContext->Flags |= 0x4; - p->FoundState = STATS(p->MinContext); -} - -CPpmd_See *Ppmd8_MakeEscFreq(CPpmd8 *p, unsigned numMasked1, UInt32 *escFreq) -{ - CPpmd_See *see; - if (p->MinContext->NumStats != 0xFF) - { - see = p->See[p->NS2Indx[p->MinContext->NumStats + 2] - 3] + - (p->MinContext->SummFreq > 11 * ((unsigned)p->MinContext->NumStats + 1)) + - 2 * (2 * (unsigned)p->MinContext->NumStats < - ((unsigned)SUFFIX(p->MinContext)->NumStats + numMasked1)) + - p->MinContext->Flags; - { - unsigned r = (see->Summ >> see->Shift); - see->Summ = (UInt16)(see->Summ - r); - *escFreq = r + (r == 0); - } - } - else - { - see = &p->DummySee; - *escFreq = 1; - } - return see; -} - -static void NextContext(CPpmd8 *p) -{ - CTX_PTR c = CTX(SUCCESSOR(p->FoundState)); - if (p->OrderFall == 0 && (Byte *)c >= p->UnitsStart) - p->MinContext = p->MaxContext = c; - else - { - UpdateModel(p); - p->MinContext = p->MaxContext; - } -} - -void Ppmd8_Update1(CPpmd8 *p) -{ - CPpmd_State *s = p->FoundState; - s->Freq += 4; - p->MinContext->SummFreq += 4; - if (s[0].Freq > s[-1].Freq) - { - SwapStates(&s[0], &s[-1]); - p->FoundState = --s; - if (s->Freq > MAX_FREQ) - Rescale(p); - } - NextContext(p); -} - -void Ppmd8_Update1_0(CPpmd8 *p) -{ - p->PrevSuccess = (2 * p->FoundState->Freq >= p->MinContext->SummFreq); - p->RunLength += p->PrevSuccess; - p->MinContext->SummFreq += 4; - if ((p->FoundState->Freq += 4) > MAX_FREQ) - Rescale(p); - NextContext(p); -} - -void Ppmd8_UpdateBin(CPpmd8 *p) -{ - p->FoundState->Freq = (Byte)(p->FoundState->Freq + (p->FoundState->Freq < 196)); - p->PrevSuccess = 1; - p->RunLength++; - NextContext(p); -} - -void Ppmd8_Update2(CPpmd8 *p) -{ - p->MinContext->SummFreq += 4; - if ((p->FoundState->Freq += 4) > MAX_FREQ) - Rescale(p); - p->RunLength = p->InitRL; - UpdateModel(p); - p->MinContext = p->MaxContext; -} - -/* H->I changes: - NS2Indx - GlewCount, and Glue method - BinSum - See / EscFreq - CreateSuccessors updates more suffix contexts - UpdateModel consts. - PrevSuccess Update -*/ |