diff options
Diffstat (limited to 'src/lib/lib7z/Ppmd7.c')
-rw-r--r-- | src/lib/lib7z/Ppmd7.c | 708 |
1 files changed, 0 insertions, 708 deletions
diff --git a/src/lib/lib7z/Ppmd7.c b/src/lib/lib7z/Ppmd7.c deleted file mode 100644 index a50e800d3ab..00000000000 --- a/src/lib/lib7z/Ppmd7.c +++ /dev/null @@ -1,708 +0,0 @@ -/* Ppmd7.c -- PPMdH codec -2010-03-12 : Igor Pavlov : Public domain -This code is based on PPMd var.H (2001): Dmitry Shkarin : Public domain */ - -#include <string.h> - -#include "Ppmd7.h" - -const Byte PPMD7_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) ((CPpmd7_Context *)Ppmd7_GetContext(p, ref)) -#define STATS(ctx) Ppmd7_GetStats(p, ctx) -#define ONE_STATE(ctx) Ppmd7Context_OneState(ctx) -#define SUFFIX(ctx) CTX((ctx)->Suffix) - -typedef CPpmd7_Context * CTX_PTR; - -struct CPpmd7_Node_; - -typedef - #ifdef PPMD_32BIT - struct CPpmd7_Node_ * - #else - UInt32 - #endif - CPpmd7_Node_Ref; - -typedef struct CPpmd7_Node_ -{ - UInt16 Stamp; /* must be at offset 0 as CPpmd7_Context::NumStats. Stamp=0 means free */ - UInt16 NU; - CPpmd7_Node_Ref Next; /* must be at offset >= 4 */ - CPpmd7_Node_Ref Prev; -} CPpmd7_Node; - -#ifdef PPMD_32BIT - #define NODE(ptr) (ptr) -#else - #define NODE(offs) ((CPpmd7_Node *)(p->Base + (offs))) -#endif - -void Ppmd7_Construct(CPpmd7 *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 < 3; i++) - p->NS2Indx[i] = (Byte)i; - for (m = i, k = 1; i < 256; i++) - { - p->NS2Indx[i] = (Byte)m; - if (--k == 0) - k = (++m) - 2; - } - - memset(p->HB2Flag, 0, 0x40); - memset(p->HB2Flag + 0x40, 8, 0x100 - 0x40); -} - -void Ppmd7_Free(CPpmd7 *p, ISzAlloc *alloc) -{ - alloc->Free(alloc, p->Base); - p->Size = 0; - p->Base = 0; -} - -Bool Ppmd7_Alloc(CPpmd7 *p, UInt32 size, ISzAlloc *alloc) -{ - if (p->Base == 0 || p->Size != size) - { - Ppmd7_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 - #ifndef PPMD_32BIT - + UNIT_SIZE - #endif - )) == 0) - return False; - p->Size = size; - } - return True; -} - -static void InsertNode(CPpmd7 *p, void *node, unsigned indx) -{ - *((CPpmd_Void_Ref *)node) = p->FreeList[indx]; - p->FreeList[indx] = REF(node); -} - -static void *RemoveNode(CPpmd7 *p, unsigned indx) -{ - CPpmd_Void_Ref *node = (CPpmd_Void_Ref *)Ppmd7_GetPtr(p, p->FreeList[indx]); - p->FreeList[indx] = *node; - return node; -} - -static void SplitBlock(CPpmd7 *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(CPpmd7 *p) -{ - #ifdef PPMD_32BIT - CPpmd7_Node headItem; - CPpmd7_Node_Ref head = &headItem; - #else - CPpmd7_Node_Ref head = p->AlignOffset + p->Size; - #endif - - CPpmd7_Node_Ref n = head; - unsigned i; - - p->GlueCount = 255; - - /* create doubly-linked list of free blocks */ - for (i = 0; i < PPMD_NUM_INDEXES; i++) - { - UInt16 nu = I2U(i); - CPpmd7_Node_Ref next = (CPpmd7_Node_Ref)p->FreeList[i]; - p->FreeList[i] = 0; - while (next != 0) - { - CPpmd7_Node *node = NODE(next); - node->Next = n; - n = NODE(n)->Prev = next; - next = *(const CPpmd7_Node_Ref *)node; - node->Stamp = 0; - node->NU = (UInt16)nu; - } - } - NODE(head)->Stamp = 1; - NODE(head)->Next = n; - NODE(n)->Prev = head; - if (p->LoUnit != p->HiUnit) - ((CPpmd7_Node *)p->LoUnit)->Stamp = 1; - - /* Glue free blocks */ - while (n != head) - { - CPpmd7_Node *node = NODE(n); - UInt32 nu = (UInt32)node->NU; - for (;;) - { - CPpmd7_Node *node2 = NODE(n) + nu; - nu += node2->NU; - if (node2->Stamp != 0 || nu >= 0x10000) - break; - NODE(node2->Prev)->Next = node2->Next; - NODE(node2->Next)->Prev = node2->Prev; - node->NU = (UInt16)nu; - } - n = node->Next; - } - - /* Fill lists of free blocks */ - for (n = NODE(head)->Next; n != head;) - { - CPpmd7_Node *node = NODE(n); - unsigned nu; - CPpmd7_Node_Ref next = node->Next; - for (nu = node->NU; 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); - n = next; - } -} - -static void *AllocUnitsRare(CPpmd7 *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(CPpmd7 *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(CPpmd7 *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; -} - -#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); -} - -static void RestartModel(CPpmd7 *p) -{ - unsigned i, k, m; - - memset(p->FreeList, 0, sizeof(p->FreeList)); - p->Text = p->Base + p->AlignOffset; - 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 = 256; - 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 = 0; i < 128; i++) - for (k = 0; k < 8; k++) - { - UInt16 *dest = p->BinSumm[i] + k; - UInt16 val = (UInt16)(PPMD_BIN_SCALE - kInitBinEsc[k] / (i + 2)); - for (m = 0; m < 64; m += 8) - dest[m] = val; - } - - for (i = 0; i < 25; i++) - for (k = 0; k < 16; k++) - { - CPpmd_See *s = &p->See[i][k]; - s->Summ = (UInt16)((5 * i + 10) << (s->Shift = PPMD_PERIOD_BITS - 4)); - s->Count = 4; - } -} - -void Ppmd7_Init(CPpmd7 *p, unsigned maxOrder) -{ - p->MaxOrder = maxOrder; - RestartModel(p); - p->DummySee.Shift = PPMD_PERIOD_BITS; - p->DummySee.Summ = 0; /* unused */ - p->DummySee.Count = 64; /* unused */ -} - -static CTX_PTR CreateSuccessors(CPpmd7 *p, Bool skip) -{ - CPpmd_State upState; - CTX_PTR c = p->MinContext; - CPpmd_Byte_Ref upBranch = (CPpmd_Byte_Ref)SUCCESSOR(p->FoundState); - CPpmd_State *ps[PPMD7_MAX_ORDER]; - unsigned numPs = 0; - - if (!skip) - ps[numPs++] = p->FoundState; - - while (c->Suffix) - { - CPpmd_Void_Ref successor; - CPpmd_State *s; - c = SUFFIX(c); - if (c->NumStats != 1) - { - for (s = STATS(c); s->Symbol != p->FoundState->Symbol; s++); - } - else - s = ONE_STATE(c); - successor = SUCCESSOR(s); - if (successor != upBranch) - { - c = CTX(successor); - if (numPs == 0) - return c; - break; - } - ps[numPs++] = s; - } - - upState.Symbol = *(const Byte *)Ppmd7_GetPtr(p, upBranch); - SetSuccessor(&upState, upBranch + 1); - - if (c->NumStats == 1) - 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) : ((2 * cf + 3 * s0 - 1) / (2 * 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 = 1; - *ONE_STATE(c1) = upState; - c1->Suffix = REF(c); - SetSuccessor(ps[--numPs], REF(c1)); - c = c1; - } - while (numPs != 0); - - return c; -} - -static void SwapStates(CPpmd_State *t1, CPpmd_State *t2) -{ - CPpmd_State tmp = *t1; - *t1 = *t2; - *t2 = tmp; -} - -static void UpdateModel(CPpmd7 *p) -{ - CPpmd_Void_Ref successor, fSuccessor = SUCCESSOR(p->FoundState); - CTX_PTR c; - unsigned s0, ns; - - if (p->FoundState->Freq < MAX_FREQ / 4 && p->MinContext->Suffix != 0) - { - c = SUFFIX(p->MinContext); - - if (c->NumStats == 1) - { - CPpmd_State *s = ONE_STATE(c); - if (s->Freq < 32) - s->Freq++; - } - else - { - CPpmd_State *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; - } - } - } - - if (p->OrderFall == 0) - { - p->MinContext = p->MaxContext = CreateSuccessors(p, True); - if (p->MinContext == 0) - { - RestartModel(p); - return; - } - SetSuccessor(p->FoundState, REF(p->MinContext)); - return; - } - - *p->Text++ = p->FoundState->Symbol; - successor = REF(p->Text); - if (p->Text >= p->UnitsStart) - { - RestartModel(p); - return; - } - - if (fSuccessor) - { - if (fSuccessor <= successor) - { - CTX_PTR cs = CreateSuccessors(p, False); - if (cs == NULL) - { - RestartModel(p); - return; - } - fSuccessor = REF(cs); - } - if (--p->OrderFall == 0) - { - successor = fSuccessor; - p->Text -= (p->MaxContext != p->MinContext); - } - } - else - { - SetSuccessor(p->FoundState, successor); - fSuccessor = REF(p->MinContext); - } - - s0 = p->MinContext->SummFreq - (ns = p->MinContext->NumStats) - (p->FoundState->Freq - 1); - - for (c = p->MaxContext; c != p->MinContext; c = SUFFIX(c)) - { - unsigned ns1; - UInt32 cf, sf; - if ((ns1 = c->NumStats) != 1) - { - if ((ns1 & 1) == 0) - { - /* Expand for one UNIT */ - unsigned oldNU = ns1 >> 1; - unsigned i = U2I(oldNU); - if (i != U2I(oldNU + 1)) - { - void *ptr = AllocUnits(p, i + 1); - void *oldPtr; - if (!ptr) - { - RestartModel(p); - return; - } - oldPtr = STATS(c); - MyMem12Cpy(ptr, oldPtr, oldNU); - InsertNode(p, oldPtr, i); - c->Stats = STATS_REF(ptr); - } - } - c->SummFreq = (UInt16)(c->SummFreq + (2 * ns1 < ns) + 2 * ((4 * ns1 <= ns) & (c->SummFreq <= 8 * ns1))); - } - else - { - CPpmd_State *s = (CPpmd_State*)AllocUnits(p, 0); - if (!s) - { - RestartModel(p); - 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 > 3)); - } - cf = 2 * (UInt32)p->FoundState->Freq * (c->SummFreq + 6); - sf = (UInt32)s0 + c->SummFreq; - if (cf < 6 * sf) - { - cf = 1 + (cf > sf) + (cf >= 4 * sf); - c->SummFreq += 3; - } - else - { - cf = 4 + (cf >= 9 * sf) + (cf >= 12 * sf) + (cf >= 15 * sf); - c->SummFreq = (UInt16)(c->SummFreq + cf); - } - { - CPpmd_State *s = STATS(c) + ns1; - SetSuccessor(s, successor); - s->Symbol = p->FoundState->Symbol; - s->Freq = (Byte)cf; - c->NumStats = (UInt16)(ns1 + 1); - } - } - p->MaxContext = p->MinContext = CTX(fSuccessor); -} - -static void Rescale(CPpmd7 *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); - s->Freq = (Byte)((s->Freq + adder) >> 1); - sumFreq = s->Freq; - - i = p->MinContext->NumStats - 1; - 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 = (UInt16)(p->MinContext->NumStats - i); - if (p->MinContext->NumStats == 1) - { - CPpmd_State tmp = *stats; - do - { - tmp.Freq = (Byte)(tmp.Freq - (tmp.Freq >> 1)); - escFreq >>= 1; - } - while (escFreq > 1); - InsertNode(p, stats, U2I(((numStats + 1) >> 1))); - *(p->FoundState = ONE_STATE(p->MinContext)) = tmp; - return; - } - n0 = (numStats + 1) >> 1; - n1 = (p->MinContext->NumStats + 1) >> 1; - if (n0 != n1) - p->MinContext->Stats = STATS_REF(ShrinkUnits(p, stats, n0, n1)); - } - p->MinContext->SummFreq = (UInt16)(sumFreq + escFreq - (escFreq >> 1)); - p->FoundState = STATS(p->MinContext); -} - -CPpmd_See *Ppmd7_MakeEscFreq(CPpmd7 *p, unsigned numMasked, UInt32 *escFreq) -{ - CPpmd_See *see; - unsigned nonMasked = p->MinContext->NumStats - numMasked; - if (p->MinContext->NumStats != 256) - { - see = p->See[p->NS2Indx[nonMasked - 1]] + - (nonMasked < (unsigned)SUFFIX(p->MinContext)->NumStats - p->MinContext->NumStats) + - 2 * (p->MinContext->SummFreq < 11 * p->MinContext->NumStats) + - 4 * (numMasked > nonMasked) + - p->HiBitsFlag; - { - 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(CPpmd7 *p) -{ - CTX_PTR c = CTX(SUCCESSOR(p->FoundState)); - if (p->OrderFall == 0 && (Byte *)c > p->Text) - p->MinContext = p->MaxContext = c; - else - UpdateModel(p); -} - -void Ppmd7_Update1(CPpmd7 *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 Ppmd7_Update1_0(CPpmd7 *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 Ppmd7_UpdateBin(CPpmd7 *p) -{ - p->FoundState->Freq = (Byte)(p->FoundState->Freq + (p->FoundState->Freq < 128 ? 1: 0)); - p->PrevSuccess = 1; - p->RunLength++; - NextContext(p); -} - -void Ppmd7_Update2(CPpmd7 *p) -{ - p->MinContext->SummFreq += 4; - if ((p->FoundState->Freq += 4) > MAX_FREQ) - Rescale(p); - p->RunLength = p->InitRL; - UpdateModel(p); -} |