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lzma2_dec.c
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lzma2_dec.c
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/* lzma2_dec.c -- LZMA2 Decoder
Based upon LzmaDec.c 2018-02-28 : Igor Pavlov : Public domain
Modified for FL2 by Conor McCarthy */
#include <stdlib.h>
#include "fl2_errors.h"
#include "fl2_internal.h"
#include "lzma2_dec.h"
#include "platform.h"
#ifdef HAVE_SMALL
# define LZMA_SIZE_OPT
#endif
#define kNumTopBits 24
#define kTopValue ((U32)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) = (LZMA2_prob)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));
#define UPDATE_1(p) range -= bound; code -= bound; *(p) = (LZMA2_prob)(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; }
#if defined __x86_64__s || defined _M_X64
#define USE_CMOV
#define PREP_BIT(p) ttt = *(p); NORMALIZE; bound = (range >> kNumBitModelTotalBits) * ttt
#define UPDATE_PREP_0 U32 r0 = bound; unsigned p0 = (ttt + ((kBitModelTotal - ttt) >> kNumMoveBits))
#define UPDATE_PREP_1 U32 r1 = range - bound; unsigned p1 = (ttt - (ttt >> kNumMoveBits))
#define UPDATE_COND(p) range=(code < bound) ? r0 : r1; *p = (LZMA2_prob)((code < bound) ? p0 : p1)
#define UPDATE_CODE code = code - ((code < bound) ? 0 : bound)
#define TREE_GET_BIT(probs, i) { LZMA2_prob *pp = (probs)+(i); PREP_BIT(pp); \
UPDATE_PREP_0; unsigned i0 = (i + i); \
UPDATE_PREP_1; unsigned i1 = (i + i) + 1; \
UPDATE_COND(pp); \
i = (code < bound) ? i0 : i1; \
UPDATE_CODE; \
}
#define REV_BIT_VAR(probs, i, m) { LZMA2_prob *pp = (probs)+(i); PREP_BIT(pp); \
UPDATE_PREP_0; U32 i0 = i + m; U32 m2 = m + m; \
UPDATE_PREP_1; U32 i1 = i + m2; \
UPDATE_COND(pp); \
i = (code < bound) ? i0 : i1; \
m = m2; \
UPDATE_CODE; \
}
#define REV_BIT_CONST(probs, i, m) { LZMA2_prob *pp = (probs)+(i); PREP_BIT(pp); \
UPDATE_PREP_0; \
UPDATE_PREP_1; \
UPDATE_COND(pp); \
i += m + (code < bound ? 0 : m); \
UPDATE_CODE; \
}
#define REV_BIT_LAST(probs, i, m) { LZMA2_prob *pp = (probs)+(i); PREP_BIT(pp); \
UPDATE_PREP_0; \
UPDATE_PREP_1; \
UPDATE_COND(pp); \
i -= code < bound ? m : 0; \
UPDATE_CODE; \
}
#define MATCHED_LITER_DEC \
match_byte += match_byte; \
bit = offs; \
offs &= match_byte; \
prob_lit = prob + (offs + bit + symbol); \
PREP_BIT(prob_lit); \
{ UPDATE_PREP_0; unsigned i0 = (symbol + symbol); \
UPDATE_PREP_1; unsigned i1 = (symbol + symbol) + 1; \
UPDATE_COND(prob_lit); \
symbol = (code < bound) ? i0 : i1; \
offs = (code < bound) ? offs ^ bit : offs; \
UPDATE_CODE; }
#else
#define TREE_GET_BIT(probs, i) { GET_BIT2(probs + i, i, ;, ;); }
#define REV_BIT(p, i, A0, A1) IF_BIT_0(p + i) \
{ UPDATE_0(p + i); A0; } else \
{ UPDATE_1(p + i); A1; }
#define REV_BIT_VAR( p, i, m) REV_BIT(p, i, i += m; m += m, m += m; i += m; )
#define REV_BIT_CONST(p, i, m) REV_BIT(p, i, i += m; , i += m * 2; )
#define REV_BIT_LAST( p, i, m) REV_BIT(p, i, i -= m , ; )
#define MATCHED_LITER_DEC \
match_byte += match_byte; \
bit = offs; \
offs &= match_byte; \
prob_lit = prob + (offs + bit + symbol); \
GET_BIT2(prob_lit, symbol, offs ^= bit; , ;)
#endif
#define TREE_DECODE(probs, limit, i) \
{ i = 1; do { TREE_GET_BIT(probs, i); } while (i < limit); i -= limit; }
#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 TREE_GET_BIT(prob, symbol)
#define NORMALIZE_CHECK if (range < kTopValue) { return 0; }
#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 REV_BIT_CHECK(p, i, m) IF_BIT_0_CHECK(p + i) \
{ UPDATE_0_CHECK; i += m; m += m; } else \
{ UPDATE_1_CHECK; m += m; i += m; }
/*
00000000 - EOS
00000001 U U - Uncompressed Reset Dic
00000010 U U - Uncompressed No Reset
100uuuuu U U P P - LZMA no reset
101uuuuu U U P P - LZMA reset state
110uuuuu U U P P S - LZMA reset state + new prop
111uuuuu U U P P S - LZMA reset state + new prop + reset dic
u, U - Unpack Size
P - Pack Size
S - Props
*/
#define LZMA2_CONTROL_LZMA (1 << 7)
#define LZMA2_CONTROL_COPY_NO_RESET 2
#define LZMA2_CONTROL_COPY_RESET_DIC 1
#define LZMA2_CONTROL_EOF 0
#define LZMA2_IS_UNCOMPRESSED_STATE(control) ((control & LZMA2_CONTROL_LZMA) == 0)
#define LZMA2_GET_LZMA_MODE(control) ((control >> 5) & 3)
#define LZMA2_IS_THERE_PROP(mode) ((mode) >= 2)
#ifdef SHOW_DEBUG_INFO
#define PRF(x) x
#else
#define PRF(x)
#endif
typedef enum
{
LZMA2_STATE_CONTROL,
LZMA2_STATE_DATA,
LZMA2_STATE_FINISHED,
LZMA2_STATE_ERROR
} LZMA2_state;
#define LZMA_DIC_MIN (1 << 12)
static BYTE LZMA_tryDummy(const LZMA2_DCtx *const p)
{
const LZMA2_prob *probs = GET_PROBS;
unsigned state = p->state;
U32 range = p->range;
U32 code = p->code;
const LZMA2_prob *prob;
U32 bound;
unsigned ttt;
unsigned pos_state = CALC_POS_STATE(p->processed_pos, (1 << p->prop.pb) - 1);
prob = probs + IsMatch + COMBINED_PS_STATE;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK
prob = probs + Literal;
if (p->check_dic_size != 0 || p->processed_pos != 0)
prob += ((U32)kLzmaLitSize *
((((p->processed_pos) & ((1 << (p->prop.lp)) - 1)) << p->prop.lc) +
(p->dic[(p->dic_pos == 0 ? p->dic_buf_size : p->dic_pos) - 1] >> (8 - p->prop.lc))));
if (state < kNumLitStates)
{
unsigned symbol = 1;
do { GET_BIT_CHECK(prob + symbol, symbol) } while (symbol < 0x100);
}
else
{
unsigned match_byte = p->dic[p->dic_pos - p->reps[0] +
(p->dic_pos < p->reps[0] ? p->dic_buf_size : 0)];
unsigned offs = 0x100;
unsigned symbol = 1;
do
{
unsigned bit;
const LZMA2_prob *prob_lit;
match_byte += match_byte;
bit = offs;
offs &= match_byte;
prob_lit = prob + (offs + bit + symbol);
GET_BIT2_CHECK(prob_lit, symbol, offs ^= bit; , ; )
} while (symbol < 0x100);
}
}
else
{
unsigned len;
UPDATE_1_CHECK;
prob = probs + IsRep + state;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK;
state = 0;
prob = probs + LenCoder;
}
else
{
UPDATE_1_CHECK;
prob = probs + IsRepG0 + state;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK;
prob = probs + IsRep0Long + COMBINED_PS_STATE;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK;
NORMALIZE_CHECK;
return 1;
}
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 LZMA2_prob *prob_len = prob + LenChoice;
IF_BIT_0_CHECK(prob_len)
{
UPDATE_0_CHECK;
prob_len = prob + LenLow + GET_LEN_STATE;
offset = 0;
limit = 1 << kLenNumLowBits;
}
else
{
UPDATE_1_CHECK;
prob_len = prob + LenChoice2;
IF_BIT_0_CHECK(prob_len)
{
UPDATE_0_CHECK;
prob_len = prob + LenLow + GET_LEN_STATE + (1 << kLenNumLowBits);
offset = kLenNumLowSymbols;
limit = 1 << kLenNumLowBits;
}
else
{
UPDATE_1_CHECK;
prob_len = prob + LenHigh;
offset = kLenNumLowSymbols * 2;
limit = 1 << kLenNumHighBits;
}
}
TREE_DECODE_CHECK(prob_len, limit, len);
len += offset;
}
if (state < 4)
{
unsigned pos_slot;
prob = probs + PosSlot +
((len < kNumLenToPosStates - 1 ? len : kNumLenToPosStates - 1) <<
kNumPosSlotBits);
TREE_DECODE_CHECK(prob, 1 << kNumPosSlotBits, pos_slot);
if (pos_slot >= kStartPosModelIndex)
{
unsigned num_direct_bits = ((pos_slot >> 1) - 1);
if (pos_slot < kEndPosModelIndex)
{
prob = probs + SpecPos + ((2 | (pos_slot & 1)) << num_direct_bits);
}
else
{
num_direct_bits -= kNumAlignBits;
do
{
NORMALIZE_CHECK;
range >>= 1;
code -= range & (((code - range) >> 31) - 1);
/* if (code >= range) code -= range; */
} while (--num_direct_bits != 0);
prob = probs + Align;
num_direct_bits = kNumAlignBits;
}
{
unsigned i = 1;
unsigned m = 1;
do
{
REV_BIT_CHECK(prob, i, m);
} while (--num_direct_bits != 0);
}
}
}
}
NORMALIZE_CHECK;
return 1;
}
/* First LZMA-symbol is always decoded.
And it decodes new LZMA-symbols while (buf < buf_limit), but "buf" is without last normalization
Out:
Result:
0 - OK
1 - Error
*/
#ifdef LZMA2_DEC_OPT
int LZMA_decodeReal_3(LZMA2_DCtx *p, size_t limit, const BYTE *buf_limit);
#else
static int LZMA_decodeReal_3(LZMA2_DCtx *p, size_t limit, const BYTE *buf_limit)
{
LZMA2_prob *const probs = GET_PROBS;
unsigned state = p->state;
U32 rep0 = p->reps[0], rep1 = p->reps[1], rep2 = p->reps[2], rep3 = p->reps[3];
unsigned const pb_mask = ((unsigned)1 << (p->prop.pb)) - 1;
unsigned const lc = p->prop.lc;
unsigned const lp_mask = ((unsigned)0x100 << p->prop.lp) - ((unsigned)0x100 >> lc);
BYTE *const dic = p->dic;
size_t const dic_buf_size = p->dic_buf_size;
size_t dic_pos = p->dic_pos;
U32 processed_pos = p->processed_pos;
U32 const check_dic_size = p->check_dic_size;
unsigned len = 0;
const BYTE *buf = p->buf;
U32 range = p->range;
U32 code = p->code;
do
{
LZMA2_prob *prob;
U32 bound;
unsigned ttt;
unsigned pos_state = CALC_POS_STATE(processed_pos, pb_mask);
prob = probs + IsMatch + COMBINED_PS_STATE;
IF_BIT_0(prob)
{
unsigned symbol;
UPDATE_0(prob);
prob = probs + Literal;
if (processed_pos != 0 || check_dic_size != 0)
prob += (U32)3 * ((((processed_pos << 8) + dic[(dic_pos == 0 ? dic_buf_size : dic_pos) - 1]) & lp_mask) << lc);
processed_pos++;
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 match_byte = dic[dic_pos - rep0 + (dic_pos < rep0 ? dic_buf_size : 0)];
unsigned offs = 0x100;
state -= (state < 10) ? 3 : 6;
symbol = 1;
#ifdef LZMA_SIZE_OPT
do
{
unsigned bit;
LZMA2_prob *prob_lit;
MATCHED_LITER_DEC
} while (symbol < 0x100);
#else
{
unsigned bit;
LZMA2_prob *prob_lit;
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[dic_pos++] = (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);
/*
that case was checked before with kBadRepCode:
if (check_dic_size == 0 && processed_pos == 0)
return 1;
*/
prob = probs + IsRepG0 + state;
IF_BIT_0(prob)
{
UPDATE_0(prob);
prob = probs + IsRep0Long + COMBINED_PS_STATE;
IF_BIT_0(prob)
{
UPDATE_0(prob);
dic[dic_pos] = dic[dic_pos - rep0 + (dic_pos < rep0 ? dic_buf_size : 0)];
dic_pos++;
processed_pos++;
state = state < kNumLitStates ? 9 : 11;
continue;
}
UPDATE_1(prob);
}
else
{
U32 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;
#ifdef USE_CMOV
PREP_BIT(prob);
UPDATE_PREP_0;
UPDATE_PREP_1;
UPDATE_COND(prob);
distance = code < bound ? rep2 : rep3;
rep3 = code < bound ? rep3 : rep2;
UPDATE_CODE;
#else
IF_BIT_0(prob)
{
UPDATE_0(prob);
distance = rep2;
}
else
{
UPDATE_1(prob);
distance = rep3;
rep3 = rep2;
}
#endif
rep2 = rep1;
}
rep1 = rep0;
rep0 = distance;
}
state = state < kNumLitStates ? 8 : 11;
prob = probs + RepLenCoder;
}
#ifdef LZMA_SIZE_OPT
unsigned lim, offset;
LZMA2_prob *prob_len = prob + LenChoice;
IF_BIT_0(prob_len)
{
UPDATE_0(prob_len);
prob_len = prob + LenLow + GET_LEN_STATE;
offset = 0;
lim = (1 << kLenNumLowBits);
}
else
{
UPDATE_1(prob_len);
prob_len = prob + LenChoice2;
IF_BIT_0(prob_len)
{
UPDATE_0(prob_len);
prob_len = prob + LenLow + GET_LEN_STATE + (1 << kLenNumLowBits);
offset = kLenNumLowSymbols;
lim = (1 << kLenNumLowBits);
}
else
{
UPDATE_1(prob_len);
prob_len = prob + LenHigh;
offset = kLenNumLowSymbols * 2;
lim = (1 << kLenNumHighBits);
}
}
TREE_DECODE(prob_len, lim, len);
len += offset;
#else
LZMA2_prob *prob_len = prob + LenChoice;
IF_BIT_0(prob_len)
{
UPDATE_0(prob_len);
prob_len = prob + LenLow + GET_LEN_STATE;
len = 1;
TREE_GET_BIT(prob_len, len);
TREE_GET_BIT(prob_len, len);
TREE_GET_BIT(prob_len, len);
len -= 8;
}
else
{
UPDATE_1(prob_len);
prob_len = prob + LenChoice2;
IF_BIT_0(prob_len)
{
UPDATE_0(prob_len);
prob_len = prob + LenLow + GET_LEN_STATE + (1 << kLenNumLowBits);
len = 1;
TREE_GET_BIT(prob_len, len);
TREE_GET_BIT(prob_len, len);
TREE_GET_BIT(prob_len, len);
}
else
{
UPDATE_1(prob_len);
prob_len = prob + LenHigh;
TREE_DECODE(prob_len, (1 << kLenNumHighBits), len);
len += kLenNumLowSymbols * 2;
}
}
#endif
if (state >= kNumStates)
{
U32 distance;
prob = probs + PosSlot +
((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << kNumPosSlotBits);
TREE_6_DECODE(prob, distance);
if (distance >= kStartPosModelIndex)
{
unsigned pos_slot = (unsigned)distance;
unsigned num_direct_bits = (unsigned)(((distance >> 1) - 1));
distance = (2 | (distance & 1));
if (pos_slot < kEndPosModelIndex)
{
distance <<= num_direct_bits;
prob = probs + SpecPos;
{
U32 m = 1;
distance++;
do
{
REV_BIT_VAR(prob, distance, m);
} while (--num_direct_bits);
distance -= m;
}
}
else
{
num_direct_bits -= kNumAlignBits;
do
{
NORMALIZE
range >>= 1;
U32 t;
code -= range;
t = (0 - ((U32)code >> 31));
distance = (distance << 1) + (t + 1);
code += range & t;
} while (--num_direct_bits != 0);
prob = probs + Align;
distance <<= kNumAlignBits;
{
U32 i = 1;
REV_BIT_CONST(prob, i, 1);
REV_BIT_CONST(prob, i, 2);
REV_BIT_CONST(prob, i, 4);
REV_BIT_LAST(prob, i, 8);
distance |= i;
}
}
}
rep3 = rep2;
rep2 = rep1;
rep1 = rep0;
rep0 = distance + 1;
if (distance >= (check_dic_size == 0 ? processed_pos : check_dic_size))
{
p->dic_pos = dic_pos;
return 1;
}
state = (state < kNumStates + kNumLitStates) ? kNumLitStates : kNumLitStates + 3;
}
len += kMatchMinLen;
size_t rem = limit - dic_pos;
if (rem == 0)
{
p->dic_pos = dic_pos;
return 1;
}
unsigned cur_len = ((rem < len) ? (unsigned)rem : len);
size_t pos = dic_pos - rep0 + (dic_pos < rep0 ? dic_buf_size : 0);
processed_pos += cur_len;
len -= cur_len;
if (cur_len <= dic_buf_size - pos)
{
BYTE *dest = dic + dic_pos;
ptrdiff_t src = (ptrdiff_t)pos - (ptrdiff_t)dic_pos;
const BYTE *end = dest + cur_len;
dic_pos += cur_len;
do
*(dest) = (BYTE)*(dest + src);
while (++dest != end);
}
else
{
do
{
dic[dic_pos++] = dic[pos];
if (++pos == dic_buf_size)
pos = 0;
} while (--cur_len != 0);
}
} while (dic_pos < limit && buf < buf_limit);
NORMALIZE;
p->buf = buf;
p->range = range;
p->code = code;
p->remain_len = len;
p->dic_pos = dic_pos;
p->processed_pos = processed_pos;
p->reps[0] = rep0;
p->reps[1] = rep1;
p->reps[2] = rep2;
p->reps[3] = rep3;
p->state = state;
return 0;
}
#endif
static void LZMA_writeRem(LZMA2_DCtx *const p, size_t const limit)
{
if (p->remain_len != 0 && p->remain_len < kMatchSpecLenStart)
{
BYTE *const dic = p->dic;
size_t dic_pos = p->dic_pos;
size_t const dic_buf_size = p->dic_buf_size;
unsigned len = p->remain_len;
size_t const rep0 = p->reps[0];
size_t const rem = limit - dic_pos;
if (rem < len)
len = (unsigned)(rem);
if (p->check_dic_size == 0 && p->prop.dic_size - p->processed_pos <= len)
p->check_dic_size = p->prop.dic_size;
p->processed_pos += len;
p->remain_len -= len;
while (len != 0)
{
len--;
dic[dic_pos] = dic[dic_pos - rep0 + (dic_pos < rep0 ? dic_buf_size : 0)];
dic_pos++;
}
p->dic_pos = dic_pos;
}
}
#define kRange0 0xFFFFFFFF
#define kBound0 ((kRange0 >> kNumBitModelTotalBits) << (kNumBitModelTotalBits - 1))
#define kBadRepCode (kBound0 + (((kRange0 - kBound0) >> kNumBitModelTotalBits) << (kNumBitModelTotalBits - 1)))
#if kBadRepCode != (0xC0000000 - 0x400)
#error Stop_Compiling_Bad_LZMA_Check
#endif
static size_t LZMA_decodeReal2(LZMA2_DCtx *const p, size_t const limit, const BYTE *const buf_limit)
{
if (p->buf == buf_limit && !LZMA_tryDummy(p))
return FL2_ERROR(corruption_detected);
do
{
size_t limit2 = limit;
if (p->check_dic_size == 0)
{
U32 const rem = p->prop.dic_size - p->processed_pos;
if (limit - p->dic_pos > rem)
limit2 = p->dic_pos + rem;
if (p->processed_pos == 0)
if (p->code >= kBadRepCode)
return FL2_ERROR(corruption_detected);
}
do {
if (LZMA_decodeReal_3(p, limit2, buf_limit) != 0)
return FL2_ERROR(corruption_detected);
} while (p->dic_pos < limit2 && p->buf == buf_limit && LZMA_tryDummy(p));
if (p->check_dic_size == 0 && p->processed_pos >= p->prop.dic_size)
p->check_dic_size = p->prop.dic_size;
LZMA_writeRem(p, limit);
} while (p->dic_pos < limit && p->buf < buf_limit && p->remain_len < kMatchSpecLenStart);
if (p->remain_len > kMatchSpecLenStart)
p->remain_len = kMatchSpecLenStart;
return FL2_error_no_error;
}
static void LZMA_initDicAndState(LZMA2_DCtx *const p, BYTE const init_dic, BYTE const init_state)
{
p->need_flush = 1;
p->remain_len = 0;
if (init_dic)
{
p->processed_pos = 0;
p->check_dic_size = 0;
p->need_init_state = 1;
}
if (init_state)
p->need_init_state = 1;
}
static void LZMA_init(LZMA2_DCtx *const p)
{
p->dic_pos = 0;
LZMA_initDicAndState(p, 1, 1);
}
static void LZMA_initStateReal(LZMA2_DCtx *const p)
{
size_t const num_probs = LzmaProps_GetNumProbs(&p->prop);
LZMA2_prob *probs = p->probs;
for (size_t i = 0; i < num_probs; i++)
probs[i] = kBitModelTotal >> 1;
p->reps[0] = p->reps[1] = p->reps[2] = p->reps[3] = 1;
p->state = 0;
p->need_init_state = 0;
}
static size_t LZMA_decodeToDic(LZMA2_DCtx *const p, size_t const dic_limit, const BYTE *src, size_t *const src_len,
LZMA2_finishMode finish_mode)
{
size_t in_size = *src_len;
(*src_len) = 0;
LZMA_writeRem(p, dic_limit);
if (p->need_flush)
{
if (in_size < RC_INIT_SIZE)
{
return LZMA_STATUS_NEEDS_MORE_INPUT;
}
if (src[0] != 0)
return FL2_ERROR(corruption_detected);
p->code =
((U32)src[1] << 24)
| ((U32)src[2] << 16)
| ((U32)src[3] << 8)
| ((U32)src[4]);
src += RC_INIT_SIZE;
(*src_len) += RC_INIT_SIZE;
in_size -= RC_INIT_SIZE;
p->range = 0xFFFFFFFF;
p->need_flush = 0;
}
while (1) {
if (p->dic_pos >= dic_limit)
{
if (p->remain_len == 0 && p->code == 0) {
return LZMA_STATUS_FINISHED;
}
return LZMA_STATUS_NOT_FINISHED;
}
if (p->need_init_state)
LZMA_initStateReal(p);
const BYTE *buf_limit;
if (finish_mode == LZMA_FINISH_END) {
buf_limit = src + in_size;
}
else {
if (in_size <= LZMA_REQUIRED_INPUT_MAX) {
return LZMA_STATUS_NEEDS_MORE_INPUT;
}
buf_limit = src + in_size - LZMA_REQUIRED_INPUT_MAX;
}
p->buf = src;
CHECK_F(LZMA_decodeReal2(p, dic_limit, buf_limit));
size_t const processed = (size_t)(p->buf - src);
(*src_len) += processed;
src += processed;
in_size -= processed;
}
}
void LZMA_constructDCtx(LZMA2_DCtx *p)
{
p->dic = NULL;
p->ext_dic = 1;
p->state2 = LZMA2_STATE_FINISHED;
p->probs_1664 = p->probs + 1664;
}
static void LZMA_freeDict(LZMA2_DCtx *const p)
{
if (!p->ext_dic) {
free(p->dic);
}
p->dic = NULL;
}
void LZMA_destructDCtx(LZMA2_DCtx *const p)
{
LZMA_freeDict(p);
}
size_t LZMA2_getDictSizeFromProp(BYTE const dict_prop)
{
if (dict_prop > 40)
return FL2_ERROR(corruption_detected);
size_t const dict_size = (dict_prop == 40)
? (size_t)-1
: (((size_t)2 | (dict_prop & 1)) << (dict_prop / 2 + 11));
return dict_size;
}
static size_t LZMA2_dictBufSize(size_t const dict_size)
{
size_t mask = ((size_t)1 << 12) - 1;
if (dict_size >= ((size_t)1 << 30)) mask = ((size_t)1 << 22) - 1;
else if (dict_size >= ((size_t)1 << 22)) mask = ((size_t)1 << 20) - 1;
size_t dic_buf_size = ((size_t)dict_size + mask) & ~mask;
if (dic_buf_size < dict_size)
dic_buf_size = dict_size;
return dic_buf_size;
}
size_t LZMA2_decMemoryUsage(size_t const dict_size)
{
return sizeof(LZMA2_DCtx) + LZMA2_dictBufSize(dict_size);
}
size_t LZMA2_initDecoder(LZMA2_DCtx *const p, BYTE const dict_prop, BYTE *const dic, size_t dic_buf_size)
{
size_t const dict_size = LZMA2_getDictSizeFromProp(dict_prop);
if (FL2_isError(dict_size))
return dict_size;
if (dic == NULL) {
dic_buf_size = LZMA2_dictBufSize(dict_size);
if (p->dic == NULL || dic_buf_size != p->dic_buf_size) {
LZMA_freeDict(p);
p->dic = malloc(dic_buf_size);
if (p->dic == NULL)
return FL2_ERROR(memory_allocation);
p->ext_dic = 0;
}
}
else {
LZMA_freeDict(p);
p->dic = dic;
p->ext_dic = 1;
}
p->dic_buf_size = dic_buf_size;
p->prop.lc = 3;
p->prop.lp = 0;
p->prop.lc = 2;
p->prop.dic_size = (U32)dict_size;
p->state2 = LZMA2_STATE_CONTROL;
p->need_init_dic = 1;
p->need_init_state2 = 1;
p->need_init_prop = 1;
LZMA_init(p);
return FL2_error_no_error;
}
static void LZMA_updateWithUncompressed(LZMA2_DCtx *const p, const BYTE *const src, size_t const size)
{
memcpy(p->dic + p->dic_pos, src, size);
p->dic_pos += size;
if (p->check_dic_size == 0 && p->prop.dic_size - p->processed_pos <= size)
p->check_dic_size = p->prop.dic_size;
p->processed_pos += (U32)size;
}
static unsigned LZMA2_nextChunkInfo(BYTE *const control,
size_t *const unpack_size, size_t *const pack_size,
LZMA2_props *const prop,
const BYTE *const src, ptrdiff_t *const src_len)
{
ptrdiff_t const len = *src_len;
*src_len = 0;
if (len <= 0)
return LZMA2_STATE_CONTROL;
*control = *src;
if (*control == 0) {
*src_len = 1;
return LZMA2_STATE_FINISHED;
}
if (len < 3)
return LZMA2_STATE_CONTROL;
if (LZMA2_IS_UNCOMPRESSED_STATE(*control)) {
if (*control > 2)
return LZMA2_STATE_ERROR;
*src_len = 3;