/* LzmaDec.c -- LZMA Decoder | |
2016-05-16 : Igor Pavlov : Public domain */ | |
#include "Precomp.h" | |
#include "LzmaDec.h" | |
#ifndef EFIAPI | |
#include <string.h> | |
#endif | |
#define kNumTopBits 24 | |
#define kTopValue ((UInt32)1 << kNumTopBits) | |
#define kNumBitModelTotalBits 11 | |
#define kBitModelTotal (1 << kNumBitModelTotalBits) | |
#define kNumMoveBits 5 | |
#define RC_INIT_SIZE 5 | |
#define NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | (*buf++); } | |
#define IF_BIT_0(p) ttt = *(p); NORMALIZE; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound) | |
#define UPDATE_0(p) range = bound; *(p) = (CLzmaProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits)); | |
#define UPDATE_1(p) range -= bound; code -= bound; *(p) = (CLzmaProb)(ttt - (ttt >> kNumMoveBits)); | |
#define GET_BIT2(p, i, A0, A1) IF_BIT_0(p) \ | |
{ UPDATE_0(p); i = (i + i); A0; } else \ | |
{ UPDATE_1(p); i = (i + i) + 1; A1; } | |
#define GET_BIT(p, i) GET_BIT2(p, i, ; , ;) | |
#define TREE_GET_BIT(probs, i) { GET_BIT((probs + i), i); } | |
#define TREE_DECODE(probs, limit, i) \ | |
{ i = 1; do { TREE_GET_BIT(probs, i); } while (i < limit); i -= limit; } | |
/* #define _LZMA_SIZE_OPT */ | |
#ifdef _LZMA_SIZE_OPT | |
#define TREE_6_DECODE(probs, i) TREE_DECODE(probs, (1 << 6), i) | |
#else | |
#define TREE_6_DECODE(probs, i) \ | |
{ i = 1; \ | |
TREE_GET_BIT(probs, i); \ | |
TREE_GET_BIT(probs, i); \ | |
TREE_GET_BIT(probs, i); \ | |
TREE_GET_BIT(probs, i); \ | |
TREE_GET_BIT(probs, i); \ | |
TREE_GET_BIT(probs, i); \ | |
i -= 0x40; } | |
#endif | |
#define NORMAL_LITER_DEC GET_BIT(prob + symbol, symbol) | |
#define MATCHED_LITER_DEC \ | |
matchByte <<= 1; \ | |
bit = (matchByte & offs); \ | |
probLit = prob + offs + bit + symbol; \ | |
GET_BIT2(probLit, symbol, offs &= ~bit, offs &= bit) | |
#define NORMALIZE_CHECK if (range < kTopValue) { if (buf >= bufLimit) return DUMMY_ERROR; range <<= 8; code = (code << 8) | (*buf++); } | |
#define IF_BIT_0_CHECK(p) ttt = *(p); NORMALIZE_CHECK; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound) | |
#define UPDATE_0_CHECK range = bound; | |
#define UPDATE_1_CHECK range -= bound; code -= bound; | |
#define GET_BIT2_CHECK(p, i, A0, A1) IF_BIT_0_CHECK(p) \ | |
{ UPDATE_0_CHECK; i = (i + i); A0; } else \ | |
{ UPDATE_1_CHECK; i = (i + i) + 1; A1; } | |
#define GET_BIT_CHECK(p, i) GET_BIT2_CHECK(p, i, ; , ;) | |
#define TREE_DECODE_CHECK(probs, limit, i) \ | |
{ i = 1; do { GET_BIT_CHECK(probs + i, i) } while (i < limit); i -= limit; } | |
#define kNumPosBitsMax 4 | |
#define kNumPosStatesMax (1 << kNumPosBitsMax) | |
#define kLenNumLowBits 3 | |
#define kLenNumLowSymbols (1 << kLenNumLowBits) | |
#define kLenNumMidBits 3 | |
#define kLenNumMidSymbols (1 << kLenNumMidBits) | |
#define kLenNumHighBits 8 | |
#define kLenNumHighSymbols (1 << kLenNumHighBits) | |
#define LenChoice 0 | |
#define LenChoice2 (LenChoice + 1) | |
#define LenLow (LenChoice2 + 1) | |
#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits)) | |
#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits)) | |
#define kNumLenProbs (LenHigh + kLenNumHighSymbols) | |
#define kNumStates 12 | |
#define kNumLitStates 7 | |
#define kStartPosModelIndex 4 | |
#define kEndPosModelIndex 14 | |
#define kNumFullDistances (1 << (kEndPosModelIndex >> 1)) | |
#define kNumPosSlotBits 6 | |
#define kNumLenToPosStates 4 | |
#define kNumAlignBits 4 | |
#define kAlignTableSize (1 << kNumAlignBits) | |
#define kMatchMinLen 2 | |
#define kMatchSpecLenStart (kMatchMinLen + kLenNumLowSymbols + kLenNumMidSymbols + kLenNumHighSymbols) | |
#define IsMatch 0 | |
#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax)) | |
#define IsRepG0 (IsRep + kNumStates) | |
#define IsRepG1 (IsRepG0 + kNumStates) | |
#define IsRepG2 (IsRepG1 + kNumStates) | |
#define IsRep0Long (IsRepG2 + kNumStates) | |
#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax)) | |
#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits)) | |
#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex) | |
#define LenCoder (Align + kAlignTableSize) | |
#define RepLenCoder (LenCoder + kNumLenProbs) | |
#define Literal (RepLenCoder + kNumLenProbs) | |
#define LZMA_BASE_SIZE 1846 | |
#define LZMA_LIT_SIZE 0x300 | |
#if Literal != LZMA_BASE_SIZE | |
StopCompilingDueBUG | |
#endif | |
#define LzmaProps_GetNumProbs(p) (Literal + ((UInt32)LZMA_LIT_SIZE << ((p)->lc + (p)->lp))) | |
#define LZMA_DIC_MIN (1 << 12) | |
/* First LZMA-symbol is always decoded. | |
And it decodes new LZMA-symbols while (buf < bufLimit), but "buf" is without last normalization | |
Out: | |
Result: | |
SZ_OK - OK | |
SZ_ERROR_DATA - Error | |
p->remainLen: | |
< kMatchSpecLenStart : normal remain | |
= kMatchSpecLenStart : finished | |
= kMatchSpecLenStart + 1 : Flush marker (unused now) | |
= kMatchSpecLenStart + 2 : State Init Marker (unused now) | |
*/ | |
static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, SizeT limit, const Byte *bufLimit) | |
{ | |
CLzmaProb *probs = p->probs; | |
unsigned state = p->state; | |
UInt32 rep0 = p->reps[0], rep1 = p->reps[1], rep2 = p->reps[2], rep3 = p->reps[3]; | |
unsigned pbMask = ((unsigned)1 << (p->prop.pb)) - 1; | |
unsigned lpMask = ((unsigned)1 << (p->prop.lp)) - 1; | |
unsigned lc = p->prop.lc; | |
Byte *dic = p->dic; | |
SizeT dicBufSize = p->dicBufSize; | |
SizeT dicPos = p->dicPos; | |
UInt32 processedPos = p->processedPos; | |
UInt32 checkDicSize = p->checkDicSize; | |
unsigned len = 0; | |
const Byte *buf = p->buf; | |
UInt32 range = p->range; | |
UInt32 code = p->code; | |
do | |
{ | |
CLzmaProb *prob; | |
UInt32 bound; | |
unsigned ttt; | |
unsigned posState = processedPos & pbMask; | |
prob = probs + IsMatch + (state << kNumPosBitsMax) + posState; | |
IF_BIT_0(prob) | |
{ | |
unsigned symbol; | |
UPDATE_0(prob); | |
prob = probs + Literal; | |
if (processedPos != 0 || checkDicSize != 0) | |
prob += ((UInt32)LZMA_LIT_SIZE * (((processedPos & lpMask) << lc) + | |
(dic[(dicPos == 0 ? dicBufSize : dicPos) - 1] >> (8 - lc)))); | |
processedPos++; | |
if (state < kNumLitStates) | |
{ | |
state -= (state < 4) ? state : 3; | |
symbol = 1; | |
#ifdef _LZMA_SIZE_OPT | |
do { NORMAL_LITER_DEC } while (symbol < 0x100); | |
#else | |
NORMAL_LITER_DEC | |
NORMAL_LITER_DEC | |
NORMAL_LITER_DEC | |
NORMAL_LITER_DEC | |
NORMAL_LITER_DEC | |
NORMAL_LITER_DEC | |
NORMAL_LITER_DEC | |
NORMAL_LITER_DEC | |
#endif | |
} | |
else | |
{ | |
unsigned matchByte = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)]; | |
unsigned offs = 0x100; | |
state -= (state < 10) ? 3 : 6; | |
symbol = 1; | |
#ifdef _LZMA_SIZE_OPT | |
do | |
{ | |
unsigned bit; | |
CLzmaProb *probLit; | |
MATCHED_LITER_DEC | |
} | |
while (symbol < 0x100); | |
#else | |
{ | |
unsigned bit; | |
CLzmaProb *probLit; | |
MATCHED_LITER_DEC | |
MATCHED_LITER_DEC | |
MATCHED_LITER_DEC | |
MATCHED_LITER_DEC | |
MATCHED_LITER_DEC | |
MATCHED_LITER_DEC | |
MATCHED_LITER_DEC | |
MATCHED_LITER_DEC | |
} | |
#endif | |
} | |
dic[dicPos++] = (Byte)symbol; | |
continue; | |
} | |
{ | |
UPDATE_1(prob); | |
prob = probs + IsRep + state; | |
IF_BIT_0(prob) | |
{ | |
UPDATE_0(prob); | |
state += kNumStates; | |
prob = probs + LenCoder; | |
} | |
else | |
{ | |
UPDATE_1(prob); | |
if (checkDicSize == 0 && processedPos == 0) | |
return SZ_ERROR_DATA; | |
prob = probs + IsRepG0 + state; | |
IF_BIT_0(prob) | |
{ | |
UPDATE_0(prob); | |
prob = probs + IsRep0Long + (state << kNumPosBitsMax) + posState; | |
IF_BIT_0(prob) | |
{ | |
UPDATE_0(prob); | |
dic[dicPos] = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)]; | |
dicPos++; | |
processedPos++; | |
state = state < kNumLitStates ? 9 : 11; | |
continue; | |
} | |
UPDATE_1(prob); | |
} | |
else | |
{ | |
UInt32 distance; | |
UPDATE_1(prob); | |
prob = probs + IsRepG1 + state; | |
IF_BIT_0(prob) | |
{ | |
UPDATE_0(prob); | |
distance = rep1; | |
} | |
else | |
{ | |
UPDATE_1(prob); | |
prob = probs + IsRepG2 + state; | |
IF_BIT_0(prob) | |
{ | |
UPDATE_0(prob); | |
distance = rep2; | |
} | |
else | |
{ | |
UPDATE_1(prob); | |
distance = rep3; | |
rep3 = rep2; | |
} | |
rep2 = rep1; | |
} | |
rep1 = rep0; | |
rep0 = distance; | |
} | |
state = state < kNumLitStates ? 8 : 11; | |
prob = probs + RepLenCoder; | |
} | |
#ifdef _LZMA_SIZE_OPT | |
{ | |
unsigned lim, offset; | |
CLzmaProb *probLen = prob + LenChoice; | |
IF_BIT_0(probLen) | |
{ | |
UPDATE_0(probLen); | |
probLen = prob + LenLow + (posState << kLenNumLowBits); | |
offset = 0; | |
lim = (1 << kLenNumLowBits); | |
} | |
else | |
{ | |
UPDATE_1(probLen); | |
probLen = prob + LenChoice2; | |
IF_BIT_0(probLen) | |
{ | |
UPDATE_0(probLen); | |
probLen = prob + LenMid + (posState << kLenNumMidBits); | |
offset = kLenNumLowSymbols; | |
lim = (1 << kLenNumMidBits); | |
} | |
else | |
{ | |
UPDATE_1(probLen); | |
probLen = prob + LenHigh; | |
offset = kLenNumLowSymbols + kLenNumMidSymbols; | |
lim = (1 << kLenNumHighBits); | |
} | |
} | |
TREE_DECODE(probLen, lim, len); | |
len += offset; | |
} | |
#else | |
{ | |
CLzmaProb *probLen = prob + LenChoice; | |
IF_BIT_0(probLen) | |
{ | |
UPDATE_0(probLen); | |
probLen = prob + LenLow + (posState << kLenNumLowBits); | |
len = 1; | |
TREE_GET_BIT(probLen, len); | |
TREE_GET_BIT(probLen, len); | |
TREE_GET_BIT(probLen, len); | |
len -= 8; | |
} | |
else | |
{ | |
UPDATE_1(probLen); | |
probLen = prob + LenChoice2; | |
IF_BIT_0(probLen) | |
{ | |
UPDATE_0(probLen); | |
probLen = prob + LenMid + (posState << kLenNumMidBits); | |
len = 1; | |
TREE_GET_BIT(probLen, len); | |
TREE_GET_BIT(probLen, len); | |
TREE_GET_BIT(probLen, len); | |
} | |
else | |
{ | |
UPDATE_1(probLen); | |
probLen = prob + LenHigh; | |
TREE_DECODE(probLen, (1 << kLenNumHighBits), len); | |
len += kLenNumLowSymbols + kLenNumMidSymbols; | |
} | |
} | |
} | |
#endif | |
if (state >= kNumStates) | |
{ | |
UInt32 distance; | |
prob = probs + PosSlot + | |
((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << kNumPosSlotBits); | |
TREE_6_DECODE(prob, distance); | |
if (distance >= kStartPosModelIndex) | |
{ | |
unsigned posSlot = (unsigned)distance; | |
unsigned numDirectBits = (unsigned)(((distance >> 1) - 1)); | |
distance = (2 | (distance & 1)); | |
if (posSlot < kEndPosModelIndex) | |
{ | |
distance <<= numDirectBits; | |
prob = probs + SpecPos + distance - posSlot - 1; | |
{ | |
UInt32 mask = 1; | |
unsigned i = 1; | |
do | |
{ | |
GET_BIT2(prob + i, i, ; , distance |= mask); | |
mask <<= 1; | |
} | |
while (--numDirectBits != 0); | |
} | |
} | |
else | |
{ | |
numDirectBits -= kNumAlignBits; | |
do | |
{ | |
NORMALIZE | |
range >>= 1; | |
{ | |
UInt32 t; | |
code -= range; | |
t = (0 - ((UInt32)code >> 31)); /* (UInt32)((Int32)code >> 31) */ | |
distance = (distance << 1) + (t + 1); | |
code += range & t; | |
} | |
/* | |
distance <<= 1; | |
if (code >= range) | |
{ | |
code -= range; | |
distance |= 1; | |
} | |
*/ | |
} | |
while (--numDirectBits != 0); | |
prob = probs + Align; | |
distance <<= kNumAlignBits; | |
{ | |
unsigned i = 1; | |
GET_BIT2(prob + i, i, ; , distance |= 1); | |
GET_BIT2(prob + i, i, ; , distance |= 2); | |
GET_BIT2(prob + i, i, ; , distance |= 4); | |
GET_BIT2(prob + i, i, ; , distance |= 8); | |
} | |
if (distance == (UInt32)0xFFFFFFFF) | |
{ | |
len += kMatchSpecLenStart; | |
state -= kNumStates; | |
break; | |
} | |
} | |
} | |
rep3 = rep2; | |
rep2 = rep1; | |
rep1 = rep0; | |
rep0 = distance + 1; | |
if (checkDicSize == 0) | |
{ | |
if (distance >= processedPos) | |
{ | |
p->dicPos = dicPos; | |
return SZ_ERROR_DATA; | |
} | |
} | |
else if (distance >= checkDicSize) | |
{ | |
p->dicPos = dicPos; | |
return SZ_ERROR_DATA; | |
} | |
state = (state < kNumStates + kNumLitStates) ? kNumLitStates : kNumLitStates + 3; | |
} | |
len += kMatchMinLen; | |
{ | |
SizeT rem; | |
unsigned curLen; | |
SizeT pos; | |
if ((rem = limit - dicPos) == 0) | |
{ | |
p->dicPos = dicPos; | |
return SZ_ERROR_DATA; | |
} | |
curLen = ((rem < len) ? (unsigned)rem : len); | |
pos = dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0); | |
processedPos += curLen; | |
len -= curLen; | |
if (curLen <= dicBufSize - pos) | |
{ | |
Byte *dest = dic + dicPos; | |
ptrdiff_t src = (ptrdiff_t)pos - (ptrdiff_t)dicPos; | |
const Byte *lim = dest + curLen; | |
dicPos += curLen; | |
do | |
*(dest) = (Byte)*(dest + src); | |
while (++dest != lim); | |
} | |
else | |
{ | |
do | |
{ | |
dic[dicPos++] = dic[pos]; | |
if (++pos == dicBufSize) | |
pos = 0; | |
} | |
while (--curLen != 0); | |
} | |
} | |
} | |
} | |
while (dicPos < limit && buf < bufLimit); | |
NORMALIZE; | |
p->buf = buf; | |
p->range = range; | |
p->code = code; | |
p->remainLen = len; | |
p->dicPos = dicPos; | |
p->processedPos = processedPos; | |
p->reps[0] = rep0; | |
p->reps[1] = rep1; | |
p->reps[2] = rep2; | |
p->reps[3] = rep3; | |
p->state = state; | |
return SZ_OK; | |
} | |
static void MY_FAST_CALL LzmaDec_WriteRem(CLzmaDec *p, SizeT limit) | |
{ | |
if (p->remainLen != 0 && p->remainLen < kMatchSpecLenStart) | |
{ | |
Byte *dic = p->dic; | |
SizeT dicPos = p->dicPos; | |
SizeT dicBufSize = p->dicBufSize; | |
unsigned len = p->remainLen; | |
SizeT rep0 = p->reps[0]; /* we use SizeT to avoid the BUG of VC14 for AMD64 */ | |
SizeT rem = limit - dicPos; | |
if (rem < len) | |
len = (unsigned)(rem); | |
if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= len) | |
p->checkDicSize = p->prop.dicSize; | |
p->processedPos += len; | |
p->remainLen -= len; | |
while (len != 0) | |
{ | |
len--; | |
dic[dicPos] = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)]; | |
dicPos++; | |
} | |
p->dicPos = dicPos; | |
} | |
} | |
static int MY_FAST_CALL LzmaDec_DecodeReal2(CLzmaDec *p, SizeT limit, const Byte *bufLimit) | |
{ | |
do | |
{ | |
SizeT limit2 = limit; | |
if (p->checkDicSize == 0) | |
{ | |
UInt32 rem = p->prop.dicSize - p->processedPos; | |
if (limit - p->dicPos > rem) | |
limit2 = p->dicPos + rem; | |
} | |
RINOK(LzmaDec_DecodeReal(p, limit2, bufLimit)); | |
if (p->checkDicSize == 0 && p->processedPos >= p->prop.dicSize) | |
p->checkDicSize = p->prop.dicSize; | |
LzmaDec_WriteRem(p, limit); | |
} | |
while (p->dicPos < limit && p->buf < bufLimit && p->remainLen < kMatchSpecLenStart); | |
if (p->remainLen > kMatchSpecLenStart) | |
p->remainLen = kMatchSpecLenStart; | |
return 0; | |
} | |
typedef enum | |
{ | |
DUMMY_ERROR, /* unexpected end of input stream */ | |
DUMMY_LIT, | |
DUMMY_MATCH, | |
DUMMY_REP | |
} ELzmaDummy; | |
static ELzmaDummy LzmaDec_TryDummy(const CLzmaDec *p, const Byte *buf, SizeT inSize) | |
{ | |
UInt32 range = p->range; | |
UInt32 code = p->code; | |
const Byte *bufLimit = buf + inSize; | |
const CLzmaProb *probs = p->probs; | |
unsigned state = p->state; | |
ELzmaDummy res; | |
{ | |
const CLzmaProb *prob; | |
UInt32 bound; | |
unsigned ttt; | |
unsigned posState = (p->processedPos) & ((1 << p->prop.pb) - 1); | |
prob = probs + IsMatch + (state << kNumPosBitsMax) + posState; | |
IF_BIT_0_CHECK(prob) | |
{ | |
UPDATE_0_CHECK | |
/* if (bufLimit - buf >= 7) return DUMMY_LIT; */ | |
prob = probs + Literal; | |
if (p->checkDicSize != 0 || p->processedPos != 0) | |
prob += ((UInt32)LZMA_LIT_SIZE * | |
((((p->processedPos) & ((1 << (p->prop.lp)) - 1)) << p->prop.lc) + | |
(p->dic[(p->dicPos == 0 ? p->dicBufSize : p->dicPos) - 1] >> (8 - p->prop.lc)))); | |
if (state < kNumLitStates) | |
{ | |
unsigned symbol = 1; | |
do { GET_BIT_CHECK(prob + symbol, symbol) } while (symbol < 0x100); | |
} | |
else | |
{ | |
unsigned matchByte = p->dic[p->dicPos - p->reps[0] + | |
(p->dicPos < p->reps[0] ? p->dicBufSize : 0)]; | |
unsigned offs = 0x100; | |
unsigned symbol = 1; | |
do | |
{ | |
unsigned bit; | |
const CLzmaProb *probLit; | |
matchByte <<= 1; | |
bit = (matchByte & offs); | |
probLit = prob + offs + bit + symbol; | |
GET_BIT2_CHECK(probLit, symbol, offs &= ~bit, offs &= bit) | |
} | |
while (symbol < 0x100); | |
} | |
res = DUMMY_LIT; | |
} | |
else | |
{ | |
unsigned len; | |
UPDATE_1_CHECK; | |
prob = probs + IsRep + state; | |
IF_BIT_0_CHECK(prob) | |
{ | |
UPDATE_0_CHECK; | |
state = 0; | |
prob = probs + LenCoder; | |
res = DUMMY_MATCH; | |
} | |
else | |
{ | |
UPDATE_1_CHECK; | |
res = DUMMY_REP; | |
prob = probs + IsRepG0 + state; | |
IF_BIT_0_CHECK(prob) | |
{ | |
UPDATE_0_CHECK; | |
prob = probs + IsRep0Long + (state << kNumPosBitsMax) + posState; | |
IF_BIT_0_CHECK(prob) | |
{ | |
UPDATE_0_CHECK; | |
NORMALIZE_CHECK; | |
return DUMMY_REP; | |
} | |
else | |
{ | |
UPDATE_1_CHECK; | |
} | |
} | |
else | |
{ | |
UPDATE_1_CHECK; | |
prob = probs + IsRepG1 + state; | |
IF_BIT_0_CHECK(prob) | |
{ | |
UPDATE_0_CHECK; | |
} | |
else | |
{ | |
UPDATE_1_CHECK; | |
prob = probs + IsRepG2 + state; | |
IF_BIT_0_CHECK(prob) | |
{ | |
UPDATE_0_CHECK; | |
} | |
else | |
{ | |
UPDATE_1_CHECK; | |
} | |
} | |
} | |
state = kNumStates; | |
prob = probs + RepLenCoder; | |
} | |
{ | |
unsigned limit, offset; | |
const CLzmaProb *probLen = prob + LenChoice; | |
IF_BIT_0_CHECK(probLen) | |
{ | |
UPDATE_0_CHECK; | |
probLen = prob + LenLow + (posState << kLenNumLowBits); | |
offset = 0; | |
limit = 1 << kLenNumLowBits; | |
} | |
else | |
{ | |
UPDATE_1_CHECK; | |
probLen = prob + LenChoice2; | |
IF_BIT_0_CHECK(probLen) | |
{ | |
UPDATE_0_CHECK; | |
probLen = prob + LenMid + (posState << kLenNumMidBits); | |
offset = kLenNumLowSymbols; | |
limit = 1 << kLenNumMidBits; | |
} | |
else | |
{ | |
UPDATE_1_CHECK; | |
probLen = prob + LenHigh; | |
offset = kLenNumLowSymbols + kLenNumMidSymbols; | |
limit = 1 << kLenNumHighBits; | |
} | |
} | |
TREE_DECODE_CHECK(probLen, limit, len); | |
len += offset; | |
} | |
if (state < 4) | |
{ | |
unsigned posSlot; | |
prob = probs + PosSlot + | |
((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << | |
kNumPosSlotBits); | |
TREE_DECODE_CHECK(prob, 1 << kNumPosSlotBits, posSlot); | |
if (posSlot >= kStartPosModelIndex) | |
{ | |
unsigned numDirectBits = ((posSlot >> 1) - 1); | |
/* if (bufLimit - buf >= 8) return DUMMY_MATCH; */ | |
if (posSlot < kEndPosModelIndex) | |
{ | |
prob = probs + SpecPos + ((2 | (posSlot & 1)) << numDirectBits) - posSlot - 1; | |
} | |
else | |
{ | |
numDirectBits -= kNumAlignBits; | |
do | |
{ | |
NORMALIZE_CHECK | |
range >>= 1; | |
code -= range & (((code - range) >> 31) - 1); | |
/* if (code >= range) code -= range; */ | |
} | |
while (--numDirectBits != 0); | |
prob = probs + Align; | |
numDirectBits = kNumAlignBits; | |
} | |
{ | |
unsigned i = 1; | |
do | |
{ | |
GET_BIT_CHECK(prob + i, i); | |
} | |
while (--numDirectBits != 0); | |
} | |
} | |
} | |
} | |
} | |
NORMALIZE_CHECK; | |
return res; | |
} | |
void LzmaDec_InitDicAndState(CLzmaDec *p, Bool initDic, Bool initState) | |
{ | |
p->needFlush = 1; | |
p->remainLen = 0; | |
p->tempBufSize = 0; | |
if (initDic) | |
{ | |
p->processedPos = 0; | |
p->checkDicSize = 0; | |
p->needInitState = 1; | |
} | |
if (initState) | |
p->needInitState = 1; | |
} | |
void LzmaDec_Init(CLzmaDec *p) | |
{ | |
p->dicPos = 0; | |
LzmaDec_InitDicAndState(p, True, True); | |
} | |
static void LzmaDec_InitStateReal(CLzmaDec *p) | |
{ | |
SizeT numProbs = LzmaProps_GetNumProbs(&p->prop); | |
SizeT i; | |
CLzmaProb *probs = p->probs; | |
for (i = 0; i < numProbs; i++) | |
probs[i] = kBitModelTotal >> 1; | |
p->reps[0] = p->reps[1] = p->reps[2] = p->reps[3] = 1; | |
p->state = 0; | |
p->needInitState = 0; | |
} | |
SRes LzmaDec_DecodeToDic(CLzmaDec *p, SizeT dicLimit, const Byte *src, SizeT *srcLen, | |
ELzmaFinishMode finishMode, ELzmaStatus *status) | |
{ | |
SizeT inSize = *srcLen; | |
(*srcLen) = 0; | |
LzmaDec_WriteRem(p, dicLimit); | |
*status = LZMA_STATUS_NOT_SPECIFIED; | |
while (p->remainLen != kMatchSpecLenStart) | |
{ | |
int checkEndMarkNow; | |
if (p->needFlush) | |
{ | |
for (; inSize > 0 && p->tempBufSize < RC_INIT_SIZE; (*srcLen)++, inSize--) | |
p->tempBuf[p->tempBufSize++] = *src++; | |
if (p->tempBufSize < RC_INIT_SIZE) | |
{ | |
*status = LZMA_STATUS_NEEDS_MORE_INPUT; | |
return SZ_OK; | |
} | |
if (p->tempBuf[0] != 0) | |
return SZ_ERROR_DATA; | |
p->code = | |
((UInt32)p->tempBuf[1] << 24) | |
| ((UInt32)p->tempBuf[2] << 16) | |
| ((UInt32)p->tempBuf[3] << 8) | |
| ((UInt32)p->tempBuf[4]); | |
p->range = 0xFFFFFFFF; | |
p->needFlush = 0; | |
p->tempBufSize = 0; | |
} | |
checkEndMarkNow = 0; | |
if (p->dicPos >= dicLimit) | |
{ | |
if (p->remainLen == 0 && p->code == 0) | |
{ | |
*status = LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK; | |
return SZ_OK; | |
} | |
if (finishMode == LZMA_FINISH_ANY) | |
{ | |
*status = LZMA_STATUS_NOT_FINISHED; | |
return SZ_OK; | |
} | |
if (p->remainLen != 0) | |
{ | |
*status = LZMA_STATUS_NOT_FINISHED; | |
return SZ_ERROR_DATA; | |
} | |
checkEndMarkNow = 1; | |
} | |
if (p->needInitState) | |
LzmaDec_InitStateReal(p); | |
if (p->tempBufSize == 0) | |
{ | |
SizeT processed; | |
const Byte *bufLimit; | |
if (inSize < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow) | |
{ | |
int dummyRes = LzmaDec_TryDummy(p, src, inSize); | |
if (dummyRes == DUMMY_ERROR) | |
{ | |
memcpy(p->tempBuf, src, inSize); | |
p->tempBufSize = (unsigned)inSize; | |
(*srcLen) += inSize; | |
*status = LZMA_STATUS_NEEDS_MORE_INPUT; | |
return SZ_OK; | |
} | |
if (checkEndMarkNow && dummyRes != DUMMY_MATCH) | |
{ | |
*status = LZMA_STATUS_NOT_FINISHED; | |
return SZ_ERROR_DATA; | |
} | |
bufLimit = src; | |
} | |
else | |
bufLimit = src + inSize - LZMA_REQUIRED_INPUT_MAX; | |
p->buf = src; | |
if (LzmaDec_DecodeReal2(p, dicLimit, bufLimit) != 0) | |
return SZ_ERROR_DATA; | |
processed = (SizeT)(p->buf - src); | |
(*srcLen) += processed; | |
src += processed; | |
inSize -= processed; | |
} | |
else | |
{ | |
unsigned rem = p->tempBufSize, lookAhead = 0; | |
while (rem < LZMA_REQUIRED_INPUT_MAX && lookAhead < inSize) | |
p->tempBuf[rem++] = src[lookAhead++]; | |
p->tempBufSize = rem; | |
if (rem < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow) | |
{ | |
int dummyRes = LzmaDec_TryDummy(p, p->tempBuf, rem); | |
if (dummyRes == DUMMY_ERROR) | |
{ | |
(*srcLen) += lookAhead; | |
*status = LZMA_STATUS_NEEDS_MORE_INPUT; | |
return SZ_OK; | |
} | |
if (checkEndMarkNow && dummyRes != DUMMY_MATCH) | |
{ | |
*status = LZMA_STATUS_NOT_FINISHED; | |
return SZ_ERROR_DATA; | |
} | |
} | |
p->buf = p->tempBuf; | |
if (LzmaDec_DecodeReal2(p, dicLimit, p->buf) != 0) | |
return SZ_ERROR_DATA; | |
{ | |
unsigned kkk = (unsigned)(p->buf - p->tempBuf); | |
if (rem < kkk) | |
return SZ_ERROR_FAIL; /* some internal error */ | |
rem -= kkk; | |
if (lookAhead < rem) | |
return SZ_ERROR_FAIL; /* some internal error */ | |
lookAhead -= rem; | |
} | |
(*srcLen) += lookAhead; | |
src += lookAhead; | |
inSize -= lookAhead; | |
p->tempBufSize = 0; | |
} | |
} | |
if (p->code == 0) | |
*status = LZMA_STATUS_FINISHED_WITH_MARK; | |
return (p->code == 0) ? SZ_OK : SZ_ERROR_DATA; | |
} | |
SRes LzmaDec_DecodeToBuf(CLzmaDec *p, Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status) | |
{ | |
SizeT outSize = *destLen; | |
SizeT inSize = *srcLen; | |
*srcLen = *destLen = 0; | |
for (;;) | |
{ | |
SizeT inSizeCur = inSize, outSizeCur, dicPos; | |
ELzmaFinishMode curFinishMode; | |
SRes res; | |
if (p->dicPos == p->dicBufSize) | |
p->dicPos = 0; | |
dicPos = p->dicPos; | |
if (outSize > p->dicBufSize - dicPos) | |
{ | |
outSizeCur = p->dicBufSize; | |
curFinishMode = LZMA_FINISH_ANY; | |
} | |
else | |
{ | |
outSizeCur = dicPos + outSize; | |
curFinishMode = finishMode; | |
} | |
res = LzmaDec_DecodeToDic(p, outSizeCur, src, &inSizeCur, curFinishMode, status); | |
src += inSizeCur; | |
inSize -= inSizeCur; | |
*srcLen += inSizeCur; | |
outSizeCur = p->dicPos - dicPos; | |
memcpy(dest, p->dic + dicPos, outSizeCur); | |
dest += outSizeCur; | |
outSize -= outSizeCur; | |
*destLen += outSizeCur; | |
if (res != 0) | |
return res; | |
if (outSizeCur == 0 || outSize == 0) | |
return SZ_OK; | |
} | |
} | |
void LzmaDec_FreeProbs(CLzmaDec *p, ISzAlloc *alloc) | |
{ | |
alloc->Free(alloc, p->probs); | |
p->probs = NULL; | |
} | |
static void LzmaDec_FreeDict(CLzmaDec *p, ISzAlloc *alloc) | |
{ | |
alloc->Free(alloc, p->dic); | |
p->dic = NULL; | |
} | |
void LzmaDec_Free(CLzmaDec *p, ISzAlloc *alloc) | |
{ | |
LzmaDec_FreeProbs(p, alloc); | |
LzmaDec_FreeDict(p, alloc); | |
} | |
SRes LzmaProps_Decode(CLzmaProps *p, const Byte *data, unsigned size) | |
{ | |
UInt32 dicSize; | |
Byte d; | |
if (size < LZMA_PROPS_SIZE) | |
return SZ_ERROR_UNSUPPORTED; | |
else | |
dicSize = data[1] | ((UInt32)data[2] << 8) | ((UInt32)data[3] << 16) | ((UInt32)data[4] << 24); | |
if (dicSize < LZMA_DIC_MIN) | |
dicSize = LZMA_DIC_MIN; | |
p->dicSize = dicSize; | |
d = data[0]; | |
if (d >= (9 * 5 * 5)) | |
return SZ_ERROR_UNSUPPORTED; | |
p->lc = d % 9; | |
d /= 9; | |
p->pb = d / 5; | |
p->lp = d % 5; | |
return SZ_OK; | |
} | |
static SRes LzmaDec_AllocateProbs2(CLzmaDec *p, const CLzmaProps *propNew, ISzAlloc *alloc) | |
{ | |
UInt32 numProbs = LzmaProps_GetNumProbs(propNew); | |
if (!p->probs || numProbs != p->numProbs) | |
{ | |
LzmaDec_FreeProbs(p, alloc); | |
p->probs = (CLzmaProb *)alloc->Alloc(alloc, numProbs * sizeof(CLzmaProb)); | |
p->numProbs = numProbs; | |
if (!p->probs) | |
return SZ_ERROR_MEM; | |
} | |
return SZ_OK; | |
} | |
SRes LzmaDec_AllocateProbs(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAlloc *alloc) | |
{ | |
CLzmaProps propNew; | |
RINOK(LzmaProps_Decode(&propNew, props, propsSize)); | |
RINOK(LzmaDec_AllocateProbs2(p, &propNew, alloc)); | |
p->prop = propNew; | |
return SZ_OK; | |
} | |
SRes LzmaDec_Allocate(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAlloc *alloc) | |
{ | |
CLzmaProps propNew; | |
SizeT dicBufSize; | |
RINOK(LzmaProps_Decode(&propNew, props, propsSize)); | |
RINOK(LzmaDec_AllocateProbs2(p, &propNew, alloc)); | |
{ | |
UInt32 dictSize = propNew.dicSize; | |
SizeT mask = ((UInt32)1 << 12) - 1; | |
if (dictSize >= ((UInt32)1 << 30)) mask = ((UInt32)1 << 22) - 1; | |
else if (dictSize >= ((UInt32)1 << 22)) mask = ((UInt32)1 << 20) - 1;; | |
dicBufSize = ((SizeT)dictSize + mask) & ~mask; | |
if (dicBufSize < dictSize) | |
dicBufSize = dictSize; | |
} | |
if (!p->dic || dicBufSize != p->dicBufSize) | |
{ | |
LzmaDec_FreeDict(p, alloc); | |
p->dic = (Byte *)alloc->Alloc(alloc, dicBufSize); | |
if (!p->dic) | |
{ | |
LzmaDec_FreeProbs(p, alloc); | |
return SZ_ERROR_MEM; | |
} | |
} | |
p->dicBufSize = dicBufSize; | |
p->prop = propNew; | |
return SZ_OK; | |
} | |
SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen, | |
const Byte *propData, unsigned propSize, ELzmaFinishMode finishMode, | |
ELzmaStatus *status, ISzAlloc *alloc) | |
{ | |
CLzmaDec p; | |
SRes res; | |
SizeT outSize = *destLen, inSize = *srcLen; | |
*destLen = *srcLen = 0; | |
*status = LZMA_STATUS_NOT_SPECIFIED; | |
if (inSize < RC_INIT_SIZE) | |
return SZ_ERROR_INPUT_EOF; | |
LzmaDec_Construct(&p); | |
RINOK(LzmaDec_AllocateProbs(&p, propData, propSize, alloc)); | |
p.dic = dest; | |
p.dicBufSize = outSize; | |
LzmaDec_Init(&p); | |
*srcLen = inSize; | |
res = LzmaDec_DecodeToDic(&p, outSize, src, srcLen, finishMode, status); | |
*destLen = p.dicPos; | |
if (res == SZ_OK && *status == LZMA_STATUS_NEEDS_MORE_INPUT) | |
res = SZ_ERROR_INPUT_EOF; | |
LzmaDec_FreeProbs(&p, alloc); | |
return res; | |
} |