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-rw-r--r--src/libs/7zip/unix/C/Ppmd8.c1120
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
-*/