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Diffstat (limited to 'LzmaDec.c')
| -rw-r--r-- | LzmaDec.c | 898 |
1 files changed, 898 insertions, 0 deletions
diff --git a/LzmaDec.c b/LzmaDec.c new file mode 100644 index 0000000..1236bd3 --- /dev/null +++ b/LzmaDec.c @@ -0,0 +1,898 @@ +/* LzmaDec.c -- LZMA Decoder +2009-09-20 : Igor Pavlov : Public domain */ + +#define _FILE_OFFSET_BITS 64 + +#include <errno.h> +#include <stdbool.h> +#include <stddef.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "lzip.h" +#include "LzmaDec.h" + +#define kNumTopBits 24 +#define kTopValue ((uint32_t)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) = (int)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits)); +#define UPDATE_1(p) range -= bound; code -= bound; *(p) = (int)(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 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 768 + +#define LzmaProps_GetNumProbs(p) ((uint32_t)LZMA_BASE_SIZE + (LZMA_LIT_SIZE << ((p)->lc + (p)->lp))) + +#if Literal != LZMA_BASE_SIZE +StopCompilingDueBUG +#endif + + +/* First LZMA-symbol is always decoded. +And it decodes new LZMA-symbols while (buf < bufLimit), but "buf" is without last normalization +Out: + Result: + true - OK + false - Error + p->remainLen: + < kMatchSpecLenStart : normal remain + = kMatchSpecLenStart : finished + = kMatchSpecLenStart + 1 : Flush marker + = kMatchSpecLenStart + 2 : State Init Marker +*/ + +static bool LzmaDec_DecodeReal(CLzmaDec *p, uint32_t limit, const uint8_t *bufLimit) +{ + int *probs = p->probs; + + State state = p->state; + uint32_t rep0 = p->reps[0], rep1 = p->reps[1], rep2 = p->reps[2], rep3 = p->reps[3]; + unsigned pbMask = ((unsigned)1 << (p->pb)) - 1; + unsigned lpMask = ((unsigned)1 << (p->lp)) - 1; + const unsigned lc = p->lc; + + uint8_t *dic = p->dic; + const uint32_t dicBufSize = p->dicBufSize; + uint32_t dicPos = p->dicPos; + + uint32_t processedPos = p->processedPos; + uint32_t checkDicSize = p->checkDicSize; + unsigned len = 0; + + const uint8_t *buf = p->buf; + uint32_t range = p->range; + uint32_t code = p->code; + + do + { + int *prob; + uint32_t 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 (checkDicSize != 0 || processedPos != 0) + prob += (LZMA_LIT_SIZE * (((processedPos & lpMask) << lc) + + (dic[(dicPos == 0 ? dicBufSize : dicPos) - 1] >> (8 - lc)))); + + if (state < kNumLitStates) + { + state -= (state < 4) ? state : 3; + symbol = 1; + do { GET_BIT(prob + symbol, symbol) } while (symbol < 0x100); + } + else + { + unsigned matchByte = p->dic[(dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0)]; + unsigned offs = 0x100; + state -= (state < 10) ? 3 : 6; + symbol = 1; + do + { + unsigned bit; + int *probLit; + matchByte <<= 1; + bit = (matchByte & offs); + probLit = prob + offs + bit + symbol; + GET_BIT2(probLit, symbol, offs &= ~bit, offs &= bit) + } + while (symbol < 0x100); + } + dic[dicPos++] = (uint8_t)symbol; + processedPos++; + continue; + } + else + { + 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 false; + 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_t 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; + } + { + unsigned limit, offset; + int *probLen = prob + LenChoice; + IF_BIT_0(probLen) + { + UPDATE_0(probLen); + probLen = prob + LenLow + (posState << kLenNumLowBits); + offset = 0; + limit = (1 << kLenNumLowBits); + } + else + { + UPDATE_1(probLen); + probLen = prob + LenChoice2; + IF_BIT_0(probLen) + { + UPDATE_0(probLen); + probLen = prob + LenMid + (posState << kLenNumMidBits); + offset = kLenNumLowSymbols; + limit = (1 << kLenNumMidBits); + } + else + { + UPDATE_1(probLen); + probLen = prob + LenHigh; + offset = kLenNumLowSymbols + kLenNumMidSymbols; + limit = (1 << kLenNumHighBits); + } + } + TREE_DECODE(probLen, limit, len); + len += offset; + } + + if (state >= kNumStates) + { + uint32_t distance; + prob = probs + PosSlot + + ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << kNumPosSlotBits); + TREE_6_DECODE(prob, distance); + if (distance >= kStartPosModelIndex) + { + unsigned posSlot = (unsigned)distance; + int numDirectBits = (int)(((distance >> 1) - 1)); + distance = (2 | (distance & 1)); + if (posSlot < kEndPosModelIndex) + { + distance <<= numDirectBits; + prob = probs + SpecPos + distance - posSlot - 1; + { + uint32_t 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 t; + code -= range; + t = (0 - ((uint32_t)code >> 31)); /* (uint32_t)((int)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_t)0xFFFFFFFF) + { + len += kMatchSpecLenStart; + state -= kNumStates; + break; + } + } + } + rep3 = rep2; + rep2 = rep1; + rep1 = rep0; + rep0 = distance + 1; + if (checkDicSize == 0) + { + if (distance >= processedPos) + return false; + } + else if (distance >= checkDicSize) + return false; + state = (state < kNumStates + kNumLitStates) ? kNumLitStates : kNumLitStates + 3; + } + + len += kMatchMinLen; + + if (limit == dicPos) + return false; + { + uint32_t rem = limit - dicPos; + unsigned curLen = ((rem < len) ? (unsigned)rem : len); + uint32_t pos = (dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0); + + processedPos += curLen; + + len -= curLen; + if (pos + curLen <= dicBufSize) + { + uint8_t *dest = dic + dicPos; + ptrdiff_t src = (ptrdiff_t)pos - (ptrdiff_t)dicPos; + const uint8_t *lim = dest + curLen; + dicPos += curLen; + do + *(dest) = (uint8_t)*(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 true; +} + +static void LzmaDec_WriteRem(CLzmaDec *p, uint32_t limit) +{ + if (p->remainLen != 0 && p->remainLen < kMatchSpecLenStart) + { + uint8_t *dic = p->dic; + uint32_t dicPos = p->dicPos; + const uint32_t dicBufSize = p->dicBufSize; + unsigned len = p->remainLen; + uint32_t rep0 = p->reps[0]; + if (limit - dicPos < len) + len = (unsigned)(limit - dicPos); + + if (p->checkDicSize == 0 && dicBufSize - p->processedPos <= len) + p->checkDicSize = dicBufSize; + + p->processedPos += len; + p->remainLen -= len; + while (len-- != 0) + { + dic[dicPos] = dic[(dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0)]; + dicPos++; + } + p->dicPos = dicPos; + } +} + +static int LzmaDec_DecodeReal2(CLzmaDec *p, uint32_t limit, const uint8_t *bufLimit) +{ + const uint32_t dicBufSize = p->dicBufSize; + do + { + uint32_t limit2 = limit; + if (p->checkDicSize == 0) + { + uint32_t rem = dicBufSize - p->processedPos; + if (limit - p->dicPos > rem) + limit2 = p->dicPos + rem; + } + if( !LzmaDec_DecodeReal(p, limit2, bufLimit) ) return false; + if (p->processedPos >= dicBufSize) + p->checkDicSize = dicBufSize; + LzmaDec_WriteRem(p, limit); + } + while (p->dicPos < limit && p->buf < bufLimit && p->remainLen < kMatchSpecLenStart); + + if (p->remainLen > kMatchSpecLenStart) + { + p->remainLen = kMatchSpecLenStart; + } + return true; +} + +typedef enum +{ + DUMMY_ERROR, /* unexpected end of input stream */ + DUMMY_LIT, + DUMMY_MATCH, + DUMMY_REP +} ELzmaDummy; + +static ELzmaDummy LzmaDec_TryDummy(const CLzmaDec *p, const uint8_t *buf, uint32_t inSize) +{ + uint32_t range = p->range; + uint32_t code = p->code; + const uint8_t *bufLimit = buf + inSize; + int *probs = p->probs; + State state = p->state; + ELzmaDummy res; + + { + int *prob; + uint32_t bound; + unsigned ttt; + unsigned posState = (p->processedPos) & ((1 << p->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 += (LZMA_LIT_SIZE * + ((((p->processedPos) & ((1 << (p->lp)) - 1)) << p->lc) + + (p->dic[(p->dicPos == 0 ? p->dicBufSize : p->dicPos) - 1] >> (8 - p->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; + int *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; + int *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) + { + int 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; +} + + +static void LzmaDec_InitRc(CLzmaDec *p, const uint8_t *data) +{ + p->code = ((uint32_t)data[1] << 24) | ((uint32_t)data[2] << 16) | ((uint32_t)data[3] << 8) | ((uint32_t)data[4]); + p->range = 0xFFFFFFFF; + p->needFlush = false; +} + + +static bool LzmaDec_DecodeToDic(CLzmaDec *p, uint32_t dicLimit, + const uint8_t *src, uint32_t *srcLen, + ELzmaFinishMode finishMode, ELzmaStatus *status) +{ + uint32_t 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 true; + } + if (p->tempBuf[0] != 0) + return false; + + LzmaDec_InitRc(p, p->tempBuf); + p->tempBufSize = 0; + } + + checkEndMarkNow = 0; + if (p->dicPos >= dicLimit) + { + if (p->remainLen == 0 && p->code == 0) + { + *status = LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK; + return true; + } + if (finishMode == LZMA_FINISH_ANY) + { + *status = LZMA_STATUS_NOT_FINISHED; + return true; + } + if (p->remainLen != 0) + { + *status = LZMA_STATUS_NOT_FINISHED; + return false; + } + checkEndMarkNow = 1; + } + + if (p->tempBufSize == 0) + { + uint32_t processed; + const uint8_t *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 true; + } + if (checkEndMarkNow && dummyRes != DUMMY_MATCH) + { + *status = LZMA_STATUS_NOT_FINISHED; + return false; + } + bufLimit = src; + } + else + bufLimit = src + inSize - LZMA_REQUIRED_INPUT_MAX; + p->buf = src; + if( !LzmaDec_DecodeReal2(p, dicLimit, bufLimit) ) + return false; + processed = (uint32_t)(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 true; + } + if (checkEndMarkNow && dummyRes != DUMMY_MATCH) + { + *status = LZMA_STATUS_NOT_FINISHED; + return false; + } + } + p->buf = p->tempBuf; + if( !LzmaDec_DecodeReal2(p, dicLimit, p->buf) ) + return false; + lookAhead -= (rem - (unsigned)(p->buf - p->tempBuf)); + (*srcLen) += lookAhead; + src += lookAhead; + inSize -= lookAhead; + p->tempBufSize = 0; + } + } + if (p->code == 0) + *status = LZMA_STATUS_FINISHED_WITH_MARK; + return (p->code == 0); +} + +bool LzmaDec_DecodeToBuf( CLzmaDec *p, uint8_t *dest, uint32_t *destLen, + const uint8_t *src, uint32_t *srcLen, + ELzmaFinishMode finishMode, ELzmaStatus *status ) +{ + uint32_t outSize = *destLen; + uint32_t inSize = *srcLen; + *srcLen = *destLen = 0; + for (;;) + { + uint32_t inSizeCur = inSize, outSizeCur, dicPos; + ELzmaFinishMode curFinishMode; + bool 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 ) + return false; + if (outSizeCur == 0 || outSize == 0) + return true; + } +} + + +void LzmaDec_Free(CLzmaDec *p) +{ + free( p->dic ); + free( p->probs ); +} + + +bool LzmaDec_Init(CLzmaDec *p, const uint8_t *raw_props) +{ + uint32_t i; + uint8_t d = raw_props[0]; + + p->lc = d % 9; + d /= 9; + p->pb = d / 5; + p->lp = d % 5; + + p->dicBufSize = raw_props[1] | ((uint32_t)raw_props[2] << 8) | + ((uint32_t)raw_props[3] << 16) | ((uint32_t)raw_props[4] << 24); + if (p->dicBufSize < min_dictionary_size) p->dicBufSize = min_dictionary_size; + + p->numProbs = LzmaProps_GetNumProbs(p); + p->probs = (int *)malloc(p->numProbs * sizeof(int)); + if( !p->probs ) return false; + p->dic = (uint8_t *)malloc(p->dicBufSize); + if (p->dic == 0) + { + free( p->probs ); + return false; + } + p->dicPos = 0; + p->needFlush = true; + p->remainLen = 0; + p->tempBufSize = 0; + p->processedPos = 0; + p->checkDicSize = 0; + for( i = 0; i < p->numProbs; ++i ) p->probs[i] = kBitModelTotal >> 1; + p->reps[0] = p->reps[1] = p->reps[2] = p->reps[3] = 1; + p->state = 0; + return true; +} |