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1574 lines (1263 loc) · 35.5 KB
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/* Ppmd8.c -- PPMdI codec
2023-09-07 : Igor Pavlov : Public domain
This code is based on PPMd var.I (2002): Dmitry Shkarin : Public domain */
#include "Precomp.h"
#include <string.h>
#include "Ppmd8.h"
MY_ALIGN(16)
static const Byte PPMD8_kExpEscape[16] = { 25, 14, 9, 7, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2 };
MY_ALIGN(16)
static const UInt16 PPMD8_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[(size_t)(nu) - 1])
#define I2U(indx) ((unsigned)p->Indx2Units[indx])
#define REF(ptr) Ppmd_GetRef(p, ptr)
#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 * PPMD8_CTX_PTR;
struct CPpmd8_Node_;
typedef Ppmd_Ref_Type(struct CPpmd8_Node_) CPpmd8_Node_Ref;
typedef struct CPpmd8_Node_
{
UInt32 Stamp;
CPpmd8_Node_Ref Next;
UInt32 NU;
} CPpmd8_Node;
#define NODE(r) Ppmd_GetPtr_Type(p, r, CPpmd8_Node)
void Ppmd8_Construct(CPpmd8 *p)
{
unsigned i, k, m;
p->Base = NULL;
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;
}
memcpy(p->ExpEscape, PPMD8_kExpEscape, 16);
}
void Ppmd8_Free(CPpmd8 *p, ISzAllocPtr alloc)
{
ISzAlloc_Free(alloc, p->Base);
p->Size = 0;
p->Base = NULL;
}
BoolInt Ppmd8_Alloc(CPpmd8 *p, UInt32 size, ISzAllocPtr alloc)
{
if (!p->Base || p->Size != size)
{
Ppmd8_Free(p, alloc);
p->AlignOffset = (4 - size) & 3;
if ((p->Base = (Byte *)ISzAlloc_Alloc(alloc, p->AlignOffset + size)) == NULL)
return False;
p->Size = size;
}
return True;
}
// ---------- Internal Memory Allocator ----------
#define EMPTY_NODE 0xFFFFFFFF
static void Ppmd8_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 *Ppmd8_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 Ppmd8_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);
Ppmd8_InsertNode(p, ((Byte *)ptr) + U2B(k), nu - k - 1);
}
Ppmd8_InsertNode(p, ptr, i);
}
static void Ppmd8_GlueFreeBlocks(CPpmd8 *p)
{
/*
we use first UInt32 field of 12-bytes UNITs as record type stamp
CPpmd_State { Byte Symbol; Byte Freq; : Freq != 0xFF
CPpmd8_Context { Byte NumStats; Byte Flags; UInt16 SummFreq; : Flags != 0xFF ???
CPpmd8_Node { UInt32 Stamp : Stamp == 0xFFFFFFFF for free record
: Stamp == 0 for guard
Last 12-bytes UNIT in array is always contains 12-bytes order-0 CPpmd8_Context record
*/
CPpmd8_Node_Ref n;
p->GlueCount = 1 << 13;
memset(p->Stamps, 0, sizeof(p->Stamps));
/* we set guard NODE at LoUnit */
if (p->LoUnit != p->HiUnit)
((CPpmd8_Node *)(void *)p->LoUnit)->Stamp = 0;
{
/* Glue free blocks */
CPpmd8_Node_Ref *prev = &n;
unsigned i;
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);
UInt32 nu = node->NU;
*prev = next;
next = node->Next;
if (nu != 0)
{
CPpmd8_Node *node2;
prev = &(node->Next);
while ((node2 = node + nu)->Stamp == EMPTY_NODE)
{
nu += node2->NU;
node2->NU = 0;
node->NU = nu;
}
}
}
}
*prev = 0;
}
/* Fill lists of free blocks */
while (n != 0)
{
CPpmd8_Node *node = NODE(n);
UInt32 nu = node->NU;
unsigned i;
n = node->Next;
if (nu == 0)
continue;
for (; nu > 128; nu -= 128, node += 128)
Ppmd8_InsertNode(p, node, PPMD_NUM_INDEXES - 1);
if (I2U(i = U2I(nu)) != nu)
{
unsigned k = I2U(--i);
Ppmd8_InsertNode(p, node + k, (unsigned)nu - k - 1);
}
Ppmd8_InsertNode(p, node, i);
}
}
Z7_NO_INLINE
static void *Ppmd8_AllocUnitsRare(CPpmd8 *p, unsigned indx)
{
unsigned i;
if (p->GlueCount == 0)
{
Ppmd8_GlueFreeBlocks(p);
if (p->FreeList[indx] != 0)
return Ppmd8_RemoveNode(p, indx);
}
i = indx;
do
{
if (++i == PPMD_NUM_INDEXES)
{
UInt32 numBytes = U2B(I2U(indx));
Byte *us = p->UnitsStart;
p->GlueCount--;
return ((UInt32)(us - p->Text) > numBytes) ? (p->UnitsStart = us - numBytes) : (NULL);
}
}
while (p->FreeList[i] == 0);
{
void *block = Ppmd8_RemoveNode(p, i);
Ppmd8_SplitBlock(p, block, i, indx);
return block;
}
}
static void *Ppmd8_AllocUnits(CPpmd8 *p, unsigned indx)
{
if (p->FreeList[indx] != 0)
return Ppmd8_RemoveNode(p, indx);
{
UInt32 numBytes = U2B(I2U(indx));
Byte *lo = p->LoUnit;
if ((UInt32)(p->HiUnit - lo) >= numBytes)
{
p->LoUnit = lo + numBytes;
return lo;
}
}
return Ppmd8_AllocUnitsRare(p, indx);
}
#define MEM_12_CPY(dest, src, num) \
{ UInt32 *d = (UInt32 *)(dest); \
const UInt32 *z = (const UInt32 *)(src); \
unsigned n = (num); \
do { \
d[0] = z[0]; \
d[1] = z[1]; \
d[2] = z[2]; \
z += 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 = Ppmd8_RemoveNode(p, i1);
MEM_12_CPY(ptr, oldPtr, newNU)
Ppmd8_InsertNode(p, oldPtr, i0);
return ptr;
}
Ppmd8_SplitBlock(p, oldPtr, i0, i1);
return oldPtr;
}
static void FreeUnits(CPpmd8 *p, void *ptr, unsigned nu)
{
Ppmd8_InsertNode(p, ptr, U2I(nu));
}
static void SpecialFreeUnit(CPpmd8 *p, void *ptr)
{
if ((Byte *)ptr != p->UnitsStart)
Ppmd8_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 + (1 << 14) || REF(oldPtr) > p->FreeList[indx])
return oldPtr;
ptr = Ppmd8_RemoveNode(p, indx);
MEM_12_CPY(ptr, oldPtr, nu)
if ((Byte *)oldPtr != p->UnitsStart)
Ppmd8_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 *)(void *)p->LoUnit)->Stamp = 0;
{
CPpmd8_Node *node = (CPpmd8_Node *)(void *)p->UnitsStart;
while (node->Stamp == EMPTY_NODE)
{
UInt32 nu = node->NU;
node->Stamp = 0;
count[U2I(nu)]++;
node += nu;
}
p->UnitsStart = (Byte *)node;
}
for (i = 0; i < PPMD_NUM_INDEXES; i++)
{
UInt32 cnt = count[i];
if (cnt == 0)
continue;
{
CPpmd8_Node_Ref *prev = (CPpmd8_Node_Ref *)&p->FreeList[i];
CPpmd8_Node_Ref n = *prev;
p->Stamps[i] -= cnt;
for (;;)
{
CPpmd8_Node *node = NODE(n);
n = node->Next;
if (node->Stamp != 0)
{
prev = &node->Next;
continue;
}
*prev = n;
if (--cnt == 0)
break;
}
}
}
}
#define SUCCESSOR(p) Ppmd_GET_SUCCESSOR(p)
static void Ppmd8State_SetSuccessor(CPpmd_State *p, CPpmd_Void_Ref v)
{
Ppmd_SET_SUCCESSOR(p, v)
}
#define RESET_TEXT(offs) { p->Text = p->Base + p->AlignOffset + (offs); }
Z7_NO_INLINE
static
void Ppmd8_RestartModel(CPpmd8 *p)
{
unsigned i, k, m;
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;
{
CPpmd8_Context *mc = (PPMD8_CTX_PTR)(void *)(p->HiUnit -= UNIT_SIZE); /* AllocContext(p); */
CPpmd_State *s = (CPpmd_State *)p->LoUnit; /* Ppmd8_AllocUnits(p, PPMD_NUM_INDEXES - 1); */
p->LoUnit += U2B(256 / 2);
p->MaxContext = p->MinContext = mc;
p->FoundState = s;
mc->Flags = 0;
mc->NumStats = 256 - 1;
mc->Union2.SummFreq = 256 + 1;
mc->Union4.Stats = REF(s);
mc->Suffix = 0;
for (i = 0; i < 256; i++, s++)
{
s->Symbol = (Byte)i;
s->Freq = 1;
Ppmd8State_SetSuccessor(s, 0);
}
}
for (i = m = 0; m < 25; m++)
{
while (p->NS2Indx[i] == m)
i++;
for (k = 0; k < 8; k++)
{
unsigned r;
UInt16 *dest = p->BinSumm[m] + k;
const UInt16 val = (UInt16)(PPMD_BIN_SCALE - PPMD8_kInitBinEsc[k] / (i + 1));
for (r = 0; r < 64; r += 8)
dest[r] = val;
}
}
for (i = m = 0; m < 24; m++)
{
unsigned summ;
CPpmd_See *s;
while (p->NS2Indx[(size_t)i + 3] == m + 3)
i++;
s = p->See[m];
summ = ((2 * i + 5) << (PPMD_PERIOD_BITS - 4));
for (k = 0; k < 32; k++, s++)
{
s->Summ = (UInt16)summ;
s->Shift = (PPMD_PERIOD_BITS - 4);
s->Count = 7;
}
}
p->DummySee.Summ = 0; /* unused */
p->DummySee.Shift = PPMD_PERIOD_BITS;
p->DummySee.Count = 64; /* unused */
}
void Ppmd8_Init(CPpmd8 *p, unsigned maxOrder, unsigned restoreMethod)
{
p->MaxOrder = maxOrder;
p->RestoreMethod = restoreMethod;
Ppmd8_RestartModel(p);
}
#define FLAG_RESCALED (1 << 2)
// #define FLAG_SYM_HIGH (1 << 3)
#define FLAG_PREV_HIGH (1 << 4)
#define HiBits_Prepare(sym) ((unsigned)(sym) + 0xC0)
#define HiBits_Convert_3(flags) (((flags) >> (8 - 3)) & (1 << 3))
#define HiBits_Convert_4(flags) (((flags) >> (8 - 4)) & (1 << 4))
#define PPMD8_HiBitsFlag_3(sym) HiBits_Convert_3(HiBits_Prepare(sym))
#define PPMD8_HiBitsFlag_4(sym) HiBits_Convert_4(HiBits_Prepare(sym))
// #define PPMD8_HiBitsFlag_3(sym) (0x08 * ((sym) >= 0x40))
// #define PPMD8_HiBitsFlag_4(sym) (0x10 * ((sym) >= 0x40))
/*
Refresh() is called when we remove some symbols (successors) in context.
It increases Escape_Freq for sum of all removed symbols.
*/
static void Refresh(CPpmd8 *p, PPMD8_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->Union4.Stats = REF(s);
// #ifdef PPMD8_FREEZE_SUPPORT
/*
(ctx->Union2.SummFreq >= ((UInt32)1 << 15)) can be in FREEZE mode for some files.
It's not good for range coder. So new versions of support fix:
- original PPMdI code rev.1
+ original PPMdI code rev.2
- 7-Zip default ((PPMD8_FREEZE_SUPPORT is not defined)
+ 7-Zip (p->RestoreMethod >= PPMD8_RESTORE_METHOD_FREEZE)
if we use that fixed line, we can lose compatibility with some files created before fix
if we don't use that fixed line, the program can work incorrectly in FREEZE mode in rare case.
*/
// if (p->RestoreMethod >= PPMD8_RESTORE_METHOD_FREEZE)
{
scale |= (ctx->Union2.SummFreq >= ((UInt32)1 << 15));
}
// #endif
flags = HiBits_Prepare(s->Symbol);
{
unsigned freq = s->Freq;
escFreq = ctx->Union2.SummFreq - freq;
freq = (freq + scale) >> scale;
sumFreq = freq;
s->Freq = (Byte)freq;
}
do
{
unsigned freq = (++s)->Freq;
escFreq -= freq;
freq = (freq + scale) >> scale;
sumFreq += freq;
s->Freq = (Byte)freq;
flags |= HiBits_Prepare(s->Symbol);
}
while (--i);
ctx->Union2.SummFreq = (UInt16)(sumFreq + ((escFreq + scale) >> scale));
ctx->Flags = (Byte)((ctx->Flags & (FLAG_PREV_HIGH + FLAG_RESCALED * scale)) + HiBits_Convert_3(flags));
}
static void SWAP_STATES(CPpmd_State *t1, CPpmd_State *t2)
{
CPpmd_State tmp = *t1;
*t1 = *t2;
*t2 = tmp;
}
/*
CutOff() reduces contexts:
It conversts Successors at MaxOrder to another Contexts to NULL-Successors
It removes RAW-Successors and NULL-Successors that are not Order-0
and it removes contexts when it has no Successors.
if the (Union4.Stats) is close to (UnitsStart), it moves it up.
*/
static CPpmd_Void_Ref CutOff(CPpmd8 *p, PPMD8_CTX_PTR ctx, unsigned order)
{
int ns = ctx->NumStats;
unsigned nu;
CPpmd_State *stats;
if (ns == 0)
{
CPpmd_State *s = ONE_STATE(ctx);
CPpmd_Void_Ref successor = SUCCESSOR(s);
if ((Byte *)Ppmd8_GetPtr(p, successor) >= p->UnitsStart)
{
if (order < p->MaxOrder)
successor = CutOff(p, CTX(successor), order + 1);
else
successor = 0;
Ppmd8State_SetSuccessor(s, successor);
if (successor || order <= 9) /* O_BOUND */
return REF(ctx);
}
SpecialFreeUnit(p, ctx);
return 0;
}
nu = ((unsigned)ns + 2) >> 1;
// ctx->Union4.Stats = STATS_REF(MoveUnitsUp(p, STATS(ctx), nu));
{
unsigned indx = U2I(nu);
stats = STATS(ctx);
if ((UInt32)((Byte *)stats - p->UnitsStart) <= (1 << 14)
&& (CPpmd_Void_Ref)ctx->Union4.Stats <= p->FreeList[indx])
{
void *ptr = Ppmd8_RemoveNode(p, indx);
ctx->Union4.Stats = STATS_REF(ptr);
MEM_12_CPY(ptr, (const void *)stats, nu)
if ((Byte *)stats != p->UnitsStart)
Ppmd8_InsertNode(p, stats, indx);
else
p->UnitsStart += U2B(I2U(indx));
stats = ptr;
}
}
{
CPpmd_State *s = stats + (unsigned)ns;
do
{
CPpmd_Void_Ref successor = SUCCESSOR(s);
if ((Byte *)Ppmd8_GetPtr(p, successor) < p->UnitsStart)
{
CPpmd_State *s2 = stats + (unsigned)(ns--);
if (order)
{
if (s != s2)
*s = *s2;
}
else
{
SWAP_STATES(s, s2);
Ppmd8State_SetSuccessor(s2, 0);
}
}
else
{
if (order < p->MaxOrder)
Ppmd8State_SetSuccessor(s, CutOff(p, CTX(successor), order + 1));
else
Ppmd8State_SetSuccessor(s, 0);
}
}
while (--s >= stats);
}
if (ns != ctx->NumStats && order)
{
if (ns < 0)
{
FreeUnits(p, stats, nu);
SpecialFreeUnit(p, ctx);
return 0;
}
ctx->NumStats = (Byte)ns;
if (ns == 0)
{
const Byte sym = stats->Symbol;
ctx->Flags = (Byte)((ctx->Flags & FLAG_PREV_HIGH) + PPMD8_HiBitsFlag_3(sym));
// *ONE_STATE(ctx) = *stats;
ctx->Union2.State2.Symbol = sym;
ctx->Union2.State2.Freq = (Byte)(((unsigned)stats->Freq + 11) >> 3);
ctx->Union4.State4.Successor_0 = stats->Successor_0;
ctx->Union4.State4.Successor_1 = stats->Successor_1;
FreeUnits(p, stats, nu);
}
else
{
Refresh(p, ctx, nu, ctx->Union2.SummFreq > 16 * (unsigned)ns);
}
}
return REF(ctx);
}
#ifdef PPMD8_FREEZE_SUPPORT
/*
RemoveBinContexts()
It conversts Successors at MaxOrder to another Contexts to NULL-Successors
It changes RAW-Successors to NULL-Successors
removes Bin Context without Successor, if suffix of that context is also binary.
*/
static CPpmd_Void_Ref RemoveBinContexts(CPpmd8 *p, PPMD8_CTX_PTR ctx, unsigned order)
{
if (!ctx->NumStats)
{
CPpmd_State *s = ONE_STATE(ctx);
CPpmd_Void_Ref successor = SUCCESSOR(s);
if ((Byte *)Ppmd8_GetPtr(p, successor) >= p->UnitsStart && order < p->MaxOrder)
successor = RemoveBinContexts(p, CTX(successor), order + 1);
else
successor = 0;
Ppmd8State_SetSuccessor(s, successor);
/* 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 && (!SUFFIX(ctx)->NumStats || SUFFIX(ctx)->Flags == 0xFF))
{
FreeUnits(p, ctx, 1);
return 0;
}
}
else
{
CPpmd_State *s = STATS(ctx) + ctx->NumStats;
do
{
CPpmd_Void_Ref successor = SUCCESSOR(s);
if ((Byte *)Ppmd8_GetPtr(p, successor) >= p->UnitsStart && order < p->MaxOrder)
Ppmd8State_SetSuccessor(s, RemoveBinContexts(p, CTX(successor), order + 1));
else
Ppmd8State_SetSuccessor(s, 0);
}
while (--s >= STATS(ctx));
}
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, PPMD8_CTX_PTR ctxError
#ifdef PPMD8_FREEZE_SUPPORT
, PPMD8_CTX_PTR fSuccessor
#endif
)
{
PPMD8_CTX_PTR c;
CPpmd_State *s;
RESET_TEXT(0)
// we go here in cases of error of allocation for context (c1)
// Order(MinContext) < Order(ctxError) <= Order(MaxContext)
// We remove last symbol from each of contexts [p->MaxContext ... ctxError) contexts
// So we rollback all created (symbols) before error.
for (c = p->MaxContext; c != ctxError; c = SUFFIX(c))
if (--(c->NumStats) == 0)
{
s = STATS(c);
c->Flags = (Byte)((c->Flags & FLAG_PREV_HIGH) + PPMD8_HiBitsFlag_3(s->Symbol));
// *ONE_STATE(c) = *s;
c->Union2.State2.Symbol = s->Symbol;
c->Union2.State2.Freq = (Byte)(((unsigned)s->Freq + 11) >> 3);
c->Union4.State4.Successor_0 = s->Successor_0;
c->Union4.State4.Successor_1 = s->Successor_1;
SpecialFreeUnit(p, s);
}
else
{
/* Refresh() can increase Escape_Freq on value of Freq of last symbol, that was added before error.
so the largest possible increase for Escape_Freq is (8) from value before ModelUpoadet() */
Refresh(p, c, ((unsigned)c->NumStats + 3) >> 1, 0);
}
// increase Escape Freq for context [ctxError ... p->MinContext)
for (; c != p->MinContext; c = SUFFIX(c))
if (c->NumStats == 0)
{
// ONE_STATE(c)
c->Union2.State2.Freq = (Byte)(((unsigned)c->Union2.State2.Freq + 1) >> 1);
}
else if ((c->Union2.SummFreq = (UInt16)(c->Union2.SummFreq + 4)) > 128 + 4 * c->NumStats)
Refresh(p, c, ((unsigned)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); // why?
}
else if (p->RestoreMethod == PPMD8_RESTORE_METHOD_FREEZE)
{
while (p->MaxContext->Suffix)
p->MaxContext = SUFFIX(p->MaxContext);
RemoveBinContexts(p, p->MaxContext, 0);
// we change the current mode to (PPMD8_RESTORE_METHOD_FREEZE + 1)
p->RestoreMethod = PPMD8_RESTORE_METHOD_FREEZE + 1;
p->GlueCount = 0;
p->OrderFall = p->MaxOrder;
}
else
#endif
if (p->RestoreMethod == PPMD8_RESTORE_METHOD_RESTART || GetUsedMemory(p) < (p->Size >> 1))
Ppmd8_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;
}
p->MinContext = p->MaxContext;
}
Z7_NO_INLINE
static PPMD8_CTX_PTR Ppmd8_CreateSuccessors(CPpmd8 *p, BoolInt skip, CPpmd_State *s1, PPMD8_CTX_PTR c)
{
CPpmd_Byte_Ref upBranch = (CPpmd_Byte_Ref)SUCCESSOR(p->FoundState);
Byte newSym, newFreq, flags;
unsigned numPs = 0;
CPpmd_State *ps[PPMD8_MAX_ORDER + 1]; /* fixed over Shkarin's code. Maybe it could work without + 1 too. */
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)
{
Byte sym = p->FoundState->Symbol;
for (s = STATS(c); s->Symbol != sym; s++);
if (s->Freq < MAX_FREQ - 9) { s->Freq++; c->Union2.SummFreq++; }
}
else
{
s = ONE_STATE(c);
s->Freq = (Byte)(s->Freq + (!SUFFIX(c)->NumStats & (s->Freq < 24)));
}
successor = SUCCESSOR(s);
if (successor != upBranch)
{
c = CTX(successor);
if (numPs == 0)
{
retu
8D47
rn c;
}
break;
}
ps[numPs++] = s;
}
newSym = *(const Byte *)Ppmd8_GetPtr(p, upBranch);
upBranch++;
flags = (Byte)(PPMD8_HiBitsFlag_4(p->FoundState->Symbol) + PPMD8_HiBitsFlag_3(newSym));
if (c->NumStats == 0)
newFreq = c->Union2.State2.Freq;
else
{
UInt32 cf, s0;
CPpmd_State *s;
for (s = STATS(c); s->Symbol != newSym; s++);
cf = (UInt32)s->Freq - 1;
s0 = (UInt32)c->Union2.SummFreq - c->NumStats - cf;
/*
max(newFreq)= (s->Freq - 1), when (s0 == 1)
*/
newFreq = (Byte)(1 + ((2 * cf <= s0) ? (5 * cf > s0) : ((cf + 2 * s0 - 3) / s0)));
}
do
{
PPMD8_CTX_PTR c1;
/* = AllocContext(p); */
if (p->HiUnit != p->LoUnit)
c1 = (PPMD8_CTX_PTR)(void *)(p->HiUnit -= UNIT_SIZE);
else if (p->FreeList[0] != 0)
c1 = (PPMD8_CTX_PTR)Ppmd8_RemoveNode(p, 0);
else
{
c1 = (PPMD8_CTX_PTR)Ppmd8_AllocUnitsRare(p, 0);
if (!c1)
return NULL;
}
c1->Flags = flags;
c1->NumStats = 0;
c1->Union2.State2.Symbol = newSym;
c1->Union2.State2.Freq = newFreq;
Ppmd8State_SetSuccessor(ONE_STATE(c1), upBranch);
c1->Suffix = REF(c);
Ppmd8State_SetSuccessor(ps[--numPs], REF(c1));
c = c1;
}
while (numPs != 0);
return c;
}
static PPMD8_CTX_PTR ReduceOrder(CPpmd8 *p, CPpmd_State *s1, PPMD8_CTX_PTR c)
{
CPpmd_State *s = NULL;
PPMD8_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
Ppmd8State_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 { Ppmd8State_SetSuccessor(ps[--numPs], REF(c)); } while (numPs);
RESET_TEXT(1)
p->OrderFall = 1;
}