10578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 20578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * LZMA2 decoder 30578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 40578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Authors: Lasse Collin <lasse.collin@tukaani.org> 50578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Igor Pavlov <http://7-zip.org/> 60578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 70578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * This file has been put into the public domain. 80578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * You can do whatever you want with this file. 90578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync#include "xz_private.h" 120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync#include "xz_lzma2.h" 130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Range decoder initialization eats the first five bytes of each LZMA chunk. 160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync#define RC_INIT_BYTES 5 180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Minimum number of usable input buffer to safely decode one LZMA symbol. 210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * The worst case is that we decode 22 bits using probabilities and 26 220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * direct bits. This may decode at maximum of 20 bytes of input. However, 230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * lzma_main() does an extra normalization before returning, thus we 240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * need to put 21 here. 250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync#define LZMA_IN_REQUIRED 21 270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Dictionary (history buffer) 300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * These are always true: 320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * start <= pos <= full <= end 330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * pos <= limit <= end 340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * In multi-call mode, also these are true: 360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * end == size 370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * size <= size_max 380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * allocated <= size 390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Most of these variables are size_t to support single-call mode, 410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * in which the dictionary variables address the actual output 420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * buffer directly. 430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 440578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstruct dictionary { 450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Beginning of the history buffer */ 460578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint8_t *buf; 470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Old position in buf (before decoding more data) */ 490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t start; 500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Position in buf */ 520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t pos; 530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * How full dictionary is. This is used to detect corrupt input that 560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * would read beyond the beginning of the uncompressed stream. 570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t full; 590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Write limit; we don't write to buf[limit] or later bytes. */ 610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t limit; 620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * End of the dictionary buffer. In multi-call mode, this is 650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * the same as the dictionary size. In single-call mode, this 660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * indicates the size of the output buffer. 670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t end; 690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Size of the dictionary as specified in Block Header. This is used 720578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * together with "full" to detect corrupt input that would make us 730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * read beyond the beginning of the uncompressed stream. 740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t size; 760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Maximum allowed dictionary size in multi-call mode. 790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * This is ignored in single-call mode. 800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t size_max; 820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Amount of memory currently allocated for the dictionary. 850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * This is used only with XZ_DYNALLOC. (With XZ_PREALLOC, 860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * size_max is always the same as the allocated size.) 870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t allocated; 890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Operation mode */ 910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync enum xz_mode mode; 920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync}; 930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Range decoder */ 950578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstruct rc_dec { 960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t range; 970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t code; 980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Number of initializing bytes remaining to be read 1010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * by rc_read_init(). 1020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 1030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t init_bytes_left; 1040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Buffer from which we read our input. It can be either 1070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * temp.buf or the caller-provided input buffer. 1080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 1090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync const uint8_t *in; 1100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t in_pos; 1110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t in_limit; 1120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync}; 1130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Probabilities for a length decoder. */ 1150578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstruct lzma_len_dec { 1160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Probability of match length being at least 10 */ 1170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t choice; 1180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Probability of match length being at least 18 */ 1200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t choice2; 1210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Probabilities for match lengths 2-9 */ 1230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t low[POS_STATES_MAX][LEN_LOW_SYMBOLS]; 1240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Probabilities for match lengths 10-17 */ 1260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t mid[POS_STATES_MAX][LEN_MID_SYMBOLS]; 1270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Probabilities for match lengths 18-273 */ 1290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t high[LEN_HIGH_SYMBOLS]; 1300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync}; 1310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1320578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstruct lzma_dec { 1330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Distances of latest four matches */ 1340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t rep0; 1350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t rep1; 1360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t rep2; 1370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t rep3; 1380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Types of the most recently seen LZMA symbols */ 1400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync enum lzma_state state; 1410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Length of a match. This is updated so that dict_repeat can 1440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * be called again to finish repeating the whole match. 1450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 1460578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t len; 1470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * LZMA properties or related bit masks (number of literal 1500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * context bits, a mask dervied from the number of literal 1510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * position bits, and a mask dervied from the number 1520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * position bits) 1530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 1540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t lc; 1550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t literal_pos_mask; /* (1 << lp) - 1 */ 1560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t pos_mask; /* (1 << pb) - 1 */ 1570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* If 1, it's a match. Otherwise it's a single 8-bit literal. */ 1590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t is_match[STATES][POS_STATES_MAX]; 1600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* If 1, it's a repeated match. The distance is one of rep0 .. rep3. */ 1620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t is_rep[STATES]; 1630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * If 0, distance of a repeated match is rep0. 1660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Otherwise check is_rep1. 1670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 1680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t is_rep0[STATES]; 1690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * If 0, distance of a repeated match is rep1. 1720578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Otherwise check is_rep2. 1730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 1740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t is_rep1[STATES]; 1750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* If 0, distance of a repeated match is rep2. Otherwise it is rep3. */ 1770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t is_rep2[STATES]; 1780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * If 1, the repeated match has length of one byte. Otherwise 1810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * the length is decoded from rep_len_decoder. 1820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 1830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t is_rep0_long[STATES][POS_STATES_MAX]; 1840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Probability tree for the highest two bits of the match 1870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * distance. There is a separate probability tree for match 1880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * lengths of 2 (i.e. MATCH_LEN_MIN), 3, 4, and [5, 273]. 1890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 1900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t dist_slot[DIST_STATES][DIST_SLOTS]; 1910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Probility trees for additional bits for match distance 1940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * when the distance is in the range [4, 127]. 1950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 1960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t dist_special[FULL_DISTANCES - DIST_MODEL_END]; 1970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 1980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 1990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Probability tree for the lowest four bits of a match 2000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * distance that is equal to or greater than 128. 2010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 2020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t dist_align[ALIGN_SIZE]; 2030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Length of a normal match */ 2050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync struct lzma_len_dec match_len_dec; 2060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Length of a repeated match */ 2080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync struct lzma_len_dec rep_len_dec; 2090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Probabilities of literals */ 2110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t literal[LITERAL_CODERS_MAX][LITERAL_CODER_SIZE]; 2120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync}; 2130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2140578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstruct lzma2_dec { 2150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Position in xz_dec_lzma2_run(). */ 2160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync enum lzma2_seq { 2170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync SEQ_CONTROL, 2180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync SEQ_UNCOMPRESSED_1, 2190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync SEQ_UNCOMPRESSED_2, 2200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync SEQ_COMPRESSED_0, 2210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync SEQ_COMPRESSED_1, 2220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync SEQ_PROPERTIES, 2230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync SEQ_LZMA_PREPARE, 2240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync SEQ_LZMA_RUN, 2250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync SEQ_COPY 2260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } sequence; 2270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Next position after decoding the compressed size of the chunk. */ 2290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync enum lzma2_seq next_sequence; 2300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* Uncompressed size of LZMA chunk (2 MiB at maximum) */ 2320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t uncompressed; 2330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 2350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Compressed size of LZMA chunk or compressed/uncompressed 2360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * size of uncompressed chunk (64 KiB at maximum) 2370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 2380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t compressed; 2390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 2410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * True if dictionary reset is needed. This is false before 2420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * the first chunk (LZMA or uncompressed). 2430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 2440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync bool need_dict_reset; 2450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2460578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 2470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * True if new LZMA properties are needed. This is false 2480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * before the first LZMA chunk. 2490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 2500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync bool need_props; 2510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync}; 2520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2530578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstruct xz_dec_lzma2 { 2540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 2550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * The order below is important on x86 to reduce code size and 2560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * it shouldn't hurt on other platforms. Everything up to and 2570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * including lzma.pos_mask are in the first 128 bytes on x86-32, 2580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * which allows using smaller instructions to access those 2590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * variables. On x86-64, fewer variables fit into the first 128 2600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * bytes, but this is still the best order without sacrificing 2610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * the readability by splitting the structures. 2620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 2630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync struct rc_dec rc; 2640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync struct dictionary dict; 2650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync struct lzma2_dec lzma2; 2660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync struct lzma_dec lzma; 2670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 2690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Temporary buffer which holds small number of input bytes between 2700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * decoder calls. See lzma2_lzma() for details. 2710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 2720578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync struct { 2730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t size; 2740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint8_t buf[3 * LZMA_IN_REQUIRED]; 2750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } temp; 2760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync}; 2770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/************** 2790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Dictionary * 2800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync **************/ 2810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 2830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Reset the dictionary state. When in single-call mode, set up the beginning 2840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * of the dictionary to point to the actual output buffer. 2850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 2860578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic void dict_reset(struct dictionary *dict, struct xz_buf *b) 2870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 2880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (DEC_IS_SINGLE(dict->mode)) { 2890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->buf = b->out + b->out_pos; 2900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->end = b->out_size - b->out_pos; 2910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 2920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->start = 0; 2940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->pos = 0; 2950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->limit = 0; 2960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->full = 0; 2970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 2980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 2990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Set dictionary write limit */ 3000578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic void dict_limit(struct dictionary *dict, size_t out_max) 3010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 3020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dict->end - dict->pos <= out_max) 3030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->limit = dict->end; 3040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync else 3050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->limit = dict->pos + out_max; 3060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 3070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Return true if at least one byte can be written into the dictionary. */ 3090578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic inline bool dict_has_space(const struct dictionary *dict) 3100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 3110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return dict->pos < dict->limit; 3120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 3130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 3150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Get a byte from the dictionary at the given distance. The distance is 3160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * assumed to valid, or as a special case, zero when the dictionary is 3170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * still empty. This special case is needed for single-call decoding to 3180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * avoid writing a '\0' to the end of the destination buffer. 3190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 3200578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic inline uint32_t dict_get(const struct dictionary *dict, uint32_t dist) 3210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 3220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t offset = dict->pos - dist - 1; 3230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dist >= dict->pos) 3250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync offset += dict->end; 3260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return dict->full > 0 ? dict->buf[offset] : 0; 3280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 3290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 3310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Put one byte into the dictionary. It is assumed that there is space for it. 3320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 3330578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic inline void dict_put(struct dictionary *dict, uint8_t byte) 3340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 3350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->buf[dict->pos++] = byte; 3360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dict->full < dict->pos) 3380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->full = dict->pos; 3390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 3400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 3420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Repeat given number of bytes from the given distance. If the distance is 3430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * invalid, false is returned. On success, true is returned and *len is 3440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * updated to indicate how many bytes were left to be repeated. 3450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 3460578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic bool dict_repeat(struct dictionary *dict, uint32_t *len, uint32_t dist) 3470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 3480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t back; 3490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t left; 3500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dist >= dict->full || dist >= dict->size) 3520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return false; 3530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync left = min_t(size_t, dict->limit - dict->pos, *len); 3550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync *len -= left; 3560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync back = dict->pos - dist - 1; 3580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dist >= dict->pos) 3590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync back += dict->end; 3600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync do { 3620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->buf[dict->pos++] = dict->buf[back++]; 3630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (back == dict->end) 3640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync back = 0; 3650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } while (--left > 0); 3660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dict->full < dict->pos) 3680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->full = dict->pos; 3690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return true; 3710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 3720578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Copy uncompressed data as is from input to dictionary and output buffers. */ 3740578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic void dict_uncompressed(struct dictionary *dict, struct xz_buf *b, 3750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t *left) 3760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 3770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t copy_size; 3780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync while (*left > 0 && b->in_pos < b->in_size 3800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync && b->out_pos < b->out_size) { 3810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync copy_size = min(b->in_size - b->in_pos, 3820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync b->out_size - b->out_pos); 3830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (copy_size > dict->end - dict->pos) 3840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync copy_size = dict->end - dict->pos; 3850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (copy_size > *left) 3860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync copy_size = *left; 3870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync *left -= copy_size; 3890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync memcpy(dict->buf + dict->pos, b->in + b->in_pos, copy_size); 3910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->pos += copy_size; 3920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dict->full < dict->pos) 3940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->full = dict->pos; 3950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 3960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (DEC_IS_MULTI(dict->mode)) { 3970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dict->pos == dict->end) 3980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->pos = 0; 3990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync memcpy(b->out + b->out_pos, b->in + b->in_pos, 4010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync copy_size); 4020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 4030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->start = dict->pos; 4050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync b->out_pos += copy_size; 4070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync b->in_pos += copy_size; 4080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 4090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 4100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 4120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Flush pending data from dictionary to b->out. It is assumed that there is 4130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * enough space in b->out. This is guaranteed because caller uses dict_limit() 4140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * before decoding data into the dictionary. 4150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 4160578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic uint32_t dict_flush(struct dictionary *dict, struct xz_buf *b) 4170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 4180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t copy_size = dict->pos - dict->start; 4190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (DEC_IS_MULTI(dict->mode)) { 4210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dict->pos == dict->end) 4220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->pos = 0; 4230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync memcpy(b->out + b->out_pos, dict->buf + dict->start, 4250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync copy_size); 4260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 4270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict->start = dict->pos; 4290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync b->out_pos += copy_size; 4300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return copy_size; 4310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 4320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/***************** 4340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Range decoder * 4350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync *****************/ 4360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Reset the range decoder. */ 4380578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic void rc_reset(struct rc_dec *rc) 4390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 4400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->range = (uint32_t)-1; 4410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->code = 0; 4420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->init_bytes_left = RC_INIT_BYTES; 4430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 4440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 4460578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Read the first five initial bytes into rc->code if they haven't been 4470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * read already. (Yes, the first byte gets completely ignored.) 4480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 4490578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic bool rc_read_init(struct rc_dec *rc, struct xz_buf *b) 4500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 4510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync while (rc->init_bytes_left > 0) { 4520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (b->in_pos == b->in_size) 4530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return false; 4540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->code = (rc->code << 8) + b->in[b->in_pos++]; 4560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync --rc->init_bytes_left; 4570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 4580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return true; 4600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 4610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Return true if there may not be enough input for the next decoding loop. */ 4630578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic inline bool rc_limit_exceeded(const struct rc_dec *rc) 4640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 4650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return rc->in_pos > rc->in_limit; 4660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 4670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 4690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Return true if it is possible (from point of view of range decoder) that 4700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * we have reached the end of the LZMA chunk. 4710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 4720578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic inline bool rc_is_finished(const struct rc_dec *rc) 4730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 4740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return rc->code == 0; 4750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 4760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Read the next input byte if needed. */ 4780578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic __always_inline void rc_normalize(struct rc_dec *rc) 4790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 4800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (rc->range < RC_TOP_VALUE) { 4810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->range <<= RC_SHIFT_BITS; 4820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->code = (rc->code << RC_SHIFT_BITS) + rc->in[rc->in_pos++]; 4830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 4840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 4850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 4860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 4870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Decode one bit. In some versions, this function has been splitted in three 4880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * functions so that the compiler is supposed to be able to more easily avoid 4890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * an extra branch. In this particular version of the LZMA decoder, this 4900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * doesn't seem to be a good idea (tested with GCC 3.3.6, 3.4.6, and 4.3.3 4910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * on x86). Using a non-splitted version results in nicer looking code too. 4920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 4930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * NOTE: This must return an int. Do not make it return a bool or the speed 4940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * of the code generated by GCC 3.x decreases 10-15 %. (GCC 4.3 doesn't care, 4950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * and it generates 10-20 % faster code than GCC 3.x from this file anyway.) 4960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 4970578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic __always_inline int rc_bit(struct rc_dec *rc, uint16_t *prob) 4980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 4990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t bound; 5000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync int bit; 5010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc_normalize(rc); 5030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync bound = (rc->range >> RC_BIT_MODEL_TOTAL_BITS) * *prob; 5040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (rc->code < bound) { 5050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->range = bound; 5060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync *prob += (RC_BIT_MODEL_TOTAL - *prob) >> RC_MOVE_BITS; 5070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync bit = 0; 5080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 5090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->range -= bound; 5100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->code -= bound; 5110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync *prob -= *prob >> RC_MOVE_BITS; 5120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync bit = 1; 5130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 5140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return bit; 5160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 5170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Decode a bittree starting from the most significant bit. */ 5190578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic __always_inline uint32_t rc_bittree(struct rc_dec *rc, 5200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t *probs, uint32_t limit) 5210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 5220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t symbol = 1; 5230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync do { 5250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (rc_bit(rc, &probs[symbol])) 5260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync symbol = (symbol << 1) + 1; 5270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync else 5280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync symbol <<= 1; 5290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } while (symbol < limit); 5300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return symbol; 5320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 5330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Decode a bittree starting from the least significant bit. */ 5350578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic __always_inline void rc_bittree_reverse(struct rc_dec *rc, 5360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t *probs, 5370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t *dest, uint32_t limit) 5380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 5390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t symbol = 1; 5400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t i = 0; 5410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync do { 5430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (rc_bit(rc, &probs[symbol])) { 5440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync symbol = (symbol << 1) + 1; 5450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync *dest += 1 << i; 5460578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 5470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync symbol <<= 1; 5480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 5490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } while (++i < limit); 5500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 5510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Decode direct bits (fixed fifty-fifty probability) */ 5530578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic inline void rc_direct(struct rc_dec *rc, uint32_t *dest, uint32_t limit) 5540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 5550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t mask; 5560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync do { 5580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc_normalize(rc); 5590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->range >>= 1; 5600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->code -= rc->range; 5610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync mask = (uint32_t)0 - (rc->code >> 31); 5620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc->code += rc->range & mask; 5630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync *dest = (*dest << 1) + (mask + 1); 5640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } while (--limit > 0); 5650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 5660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/******** 5680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * LZMA * 5690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync ********/ 5700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Get pointer to literal coder probability array. */ 5720578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic uint16_t *lzma_literal_probs(struct xz_dec_lzma2 *s) 5730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 5740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t prev_byte = dict_get(&s->dict, 0); 5750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t low = prev_byte >> (8 - s->lzma.lc); 5760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t high = (s->dict.pos & s->lzma.literal_pos_mask) << s->lzma.lc; 5770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return s->lzma.literal[low + high]; 5780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 5790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Decode a literal (one 8-bit byte) */ 5810578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic void lzma_literal(struct xz_dec_lzma2 *s) 5820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 5830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t *probs; 5840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t symbol; 5850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t match_byte; 5860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t match_bit; 5870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t offset; 5880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t i; 5890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync probs = lzma_literal_probs(s); 5910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (lzma_state_is_literal(s->lzma.state)) { 5930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync symbol = rc_bittree(&s->rc, probs, 0x100); 5940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 5950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync symbol = 1; 5960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync match_byte = dict_get(&s->dict, s->lzma.rep0) << 1; 5970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync offset = 0x100; 5980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 5990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync do { 6000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync match_bit = match_byte & offset; 6010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync match_byte <<= 1; 6020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync i = offset + match_bit + symbol; 6030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (rc_bit(&s->rc, &probs[i])) { 6050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync symbol = (symbol << 1) + 1; 6060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync offset &= match_bit; 6070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 6080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync symbol <<= 1; 6090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync offset &= ~match_bit; 6100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 6110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } while (symbol < 0x100); 6120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 6130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict_put(&s->dict, (uint8_t)symbol); 6150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_state_literal(&s->lzma.state); 6160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 6170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Decode the length of the match into s->lzma.len. */ 6190578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic void lzma_len(struct xz_dec_lzma2 *s, struct lzma_len_dec *l, 6200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t pos_state) 6210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 6220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t *probs; 6230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t limit; 6240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!rc_bit(&s->rc, &l->choice)) { 6260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync probs = l->low[pos_state]; 6270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync limit = LEN_LOW_SYMBOLS; 6280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.len = MATCH_LEN_MIN; 6290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 6300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!rc_bit(&s->rc, &l->choice2)) { 6310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync probs = l->mid[pos_state]; 6320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync limit = LEN_MID_SYMBOLS; 6330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.len = MATCH_LEN_MIN + LEN_LOW_SYMBOLS; 6340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 6350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync probs = l->high; 6360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync limit = LEN_HIGH_SYMBOLS; 6370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.len = MATCH_LEN_MIN + LEN_LOW_SYMBOLS 6380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync + LEN_MID_SYMBOLS; 6390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 6400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 6410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.len += rc_bittree(&s->rc, probs, limit) - limit; 6430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 6440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* Decode a match. The distance will be stored in s->lzma.rep0. */ 6460578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic void lzma_match(struct xz_dec_lzma2 *s, uint32_t pos_state) 6470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 6480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t *probs; 6490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t dist_slot; 6500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t limit; 6510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_state_match(&s->lzma.state); 6530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep3 = s->lzma.rep2; 6550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep2 = s->lzma.rep1; 6560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep1 = s->lzma.rep0; 6570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_len(s, &s->lzma.match_len_dec, pos_state); 6590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync probs = s->lzma.dist_slot[lzma_get_dist_state(s->lzma.len)]; 6610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dist_slot = rc_bittree(&s->rc, probs, DIST_SLOTS) - DIST_SLOTS; 6620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dist_slot < DIST_MODEL_START) { 6640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep0 = dist_slot; 6650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 6660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync limit = (dist_slot >> 1) - 1; 6670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep0 = 2 + (dist_slot & 1); 6680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dist_slot < DIST_MODEL_END) { 6700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep0 <<= limit; 6710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync probs = s->lzma.dist_special + s->lzma.rep0 6720578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync - dist_slot - 1; 6730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc_bittree_reverse(&s->rc, probs, 6740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync &s->lzma.rep0, limit); 6750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 6760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc_direct(&s->rc, &s->lzma.rep0, limit - ALIGN_BITS); 6770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep0 <<= ALIGN_BITS; 6780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc_bittree_reverse(&s->rc, s->lzma.dist_align, 6790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync &s->lzma.rep0, ALIGN_BITS); 6800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 6810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 6820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 6830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 6850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Decode a repeated match. The distance is one of the four most recently 6860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * seen matches. The distance will be stored in s->lzma.rep0. 6870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 6880578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic void lzma_rep_match(struct xz_dec_lzma2 *s, uint32_t pos_state) 6890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 6900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t tmp; 6910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 6920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!rc_bit(&s->rc, &s->lzma.is_rep0[s->lzma.state])) { 6930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!rc_bit(&s->rc, &s->lzma.is_rep0_long[ 6940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.state][pos_state])) { 6950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_state_short_rep(&s->lzma.state); 6960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.len = 1; 6970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return; 6980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 6990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 7000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!rc_bit(&s->rc, &s->lzma.is_rep1[s->lzma.state])) { 7010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync tmp = s->lzma.rep1; 7020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 7030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!rc_bit(&s->rc, &s->lzma.is_rep2[s->lzma.state])) { 7040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync tmp = s->lzma.rep2; 7050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 7060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync tmp = s->lzma.rep3; 7070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep3 = s->lzma.rep2; 7080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 7090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep2 = s->lzma.rep1; 7110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 7120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep1 = s->lzma.rep0; 7140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep0 = tmp; 7150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 7160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_state_long_rep(&s->lzma.state); 7180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_len(s, &s->lzma.rep_len_dec, pos_state); 7190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 7200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* LZMA decoder core */ 7220578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic bool lzma_main(struct xz_dec_lzma2 *s) 7230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 7240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t pos_state; 7250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 7270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * If the dictionary was reached during the previous call, try to 7280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * finish the possibly pending repeat in the dictionary. 7290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 7300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (dict_has_space(&s->dict) && s->lzma.len > 0) 7310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict_repeat(&s->dict, &s->lzma.len, s->lzma.rep0); 7320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 7340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Decode more LZMA symbols. One iteration may consume up to 7350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * LZMA_IN_REQUIRED - 1 bytes. 7360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 7370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync while (dict_has_space(&s->dict) && !rc_limit_exceeded(&s->rc)) { 7380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync pos_state = s->dict.pos & s->lzma.pos_mask; 7390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!rc_bit(&s->rc, &s->lzma.is_match[ 7410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.state][pos_state])) { 7420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_literal(s); 7430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 7440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (rc_bit(&s->rc, &s->lzma.is_rep[s->lzma.state])) 7450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_rep_match(s, pos_state); 7460578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync else 7470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_match(s, pos_state); 7480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!dict_repeat(&s->dict, &s->lzma.len, s->lzma.rep0)) 7500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return false; 7510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 7520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 7530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 7550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Having the range decoder always normalized when we are outside 7560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * this function makes it easier to correctly handle end of the chunk. 7570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 7580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc_normalize(&s->rc); 7590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return true; 7610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 7620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 7640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Reset the LZMA decoder and range decoder state. Dictionary is nore reset 7650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * here, because LZMA state may be reset without resetting the dictionary. 7660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 7670578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic void lzma_reset(struct xz_dec_lzma2 *s) 7680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 7690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint16_t *probs; 7700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t i; 7710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7720578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.state = STATE_LIT_LIT; 7730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep0 = 0; 7740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep1 = 0; 7750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep2 = 0; 7760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.rep3 = 0; 7770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 7790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * All probabilities are initialized to the same value. This hack 7800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * makes the code smaller by avoiding a separate loop for each 7810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * probability array. 7820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 7830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * This could be optimized so that only that part of literal 7840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * probabilities that are actually required. In the common case 7850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * we would write 12 KiB less. 7860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 7870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync probs = s->lzma.is_match[0]; 7880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync for (i = 0; i < PROBS_TOTAL; ++i) 7890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync probs[i] = RC_BIT_MODEL_TOTAL / 2; 7900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc_reset(&s->rc); 7920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 7930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 7940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 7950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Decode and validate LZMA properties (lc/lp/pb) and calculate the bit masks 7960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * from the decoded lp and pb values. On success, the LZMA decoder state is 7970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * reset and true is returned. 7980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 7990578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic bool lzma_props(struct xz_dec_lzma2 *s, uint8_t props) 8000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 8010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (props > (4 * 5 + 4) * 9 + 8) 8020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return false; 8030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.pos_mask = 0; 8050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync while (props >= 9 * 5) { 8060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync props -= 9 * 5; 8070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync ++s->lzma.pos_mask; 8080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 8090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.pos_mask = (1 << s->lzma.pos_mask) - 1; 8110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.literal_pos_mask = 0; 8130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync while (props >= 9) { 8140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync props -= 9; 8150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync ++s->lzma.literal_pos_mask; 8160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 8170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.lc = props; 8190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->lzma.lc + s->lzma.literal_pos_mask > 4) 8210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return false; 8220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.literal_pos_mask = (1 << s->lzma.literal_pos_mask) - 1; 8240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_reset(s); 8260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return true; 8280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 8290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/********* 8310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * LZMA2 * 8320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync *********/ 8330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 8350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * The LZMA decoder assumes that if the input limit (s->rc.in_limit) hasn't 8360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * been exceeded, it is safe to read up to LZMA_IN_REQUIRED bytes. This 8370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * wrapper function takes care of making the LZMA decoder's assumption safe. 8380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 8390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * As long as there is plenty of input left to be decoded in the current LZMA 8400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * chunk, we decode directly from the caller-supplied input buffer until 8410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * there's LZMA_IN_REQUIRED bytes left. Those remaining bytes are copied into 8420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * s->temp.buf, which (hopefully) gets filled on the next call to this 8430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * function. We decode a few bytes from the temporary buffer so that we can 8440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * continue decoding from the caller-supplied input buffer again. 8450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 8460578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncstatic bool lzma2_lzma(struct xz_dec_lzma2 *s, struct xz_buf *b) 8470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 8480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync size_t in_avail; 8490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t tmp; 8500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync in_avail = b->in_size - b->in_pos; 8520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->temp.size > 0 || s->lzma2.compressed == 0) { 8530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync tmp = 2 * LZMA_IN_REQUIRED - s->temp.size; 8540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (tmp > s->lzma2.compressed - s->temp.size) 8550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync tmp = s->lzma2.compressed - s->temp.size; 8560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (tmp > in_avail) 8570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync tmp = in_avail; 8580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync memcpy(s->temp.buf + s->temp.size, b->in + b->in_pos, tmp); 8600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->temp.size + tmp == s->lzma2.compressed) { 8620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync memzero(s->temp.buf + s->temp.size + tmp, 8630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync sizeof(s->temp.buf) 8640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync - s->temp.size - tmp); 8650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->rc.in_limit = s->temp.size + tmp; 8660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else if (s->temp.size + tmp < LZMA_IN_REQUIRED) { 8670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->temp.size += tmp; 8680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync b->in_pos += tmp; 8690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return true; 8700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 8710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->rc.in_limit = s->temp.size + tmp - LZMA_IN_REQUIRED; 8720578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 8730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->rc.in = s->temp.buf; 8750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->rc.in_pos = 0; 8760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!lzma_main(s) || s->rc.in_pos > s->temp.size + tmp) 8780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return false; 8790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.compressed -= s->rc.in_pos; 8810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->rc.in_pos < s->temp.size) { 8830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->temp.size -= s->rc.in_pos; 8840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync memmove(s->temp.buf, s->temp.buf + s->rc.in_pos, 8850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->temp.size); 8860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return true; 8870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 8880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync b->in_pos += s->rc.in_pos - s->temp.size; 8900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->temp.size = 0; 8910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 8920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync in_avail = b->in_size - b->in_pos; 8940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (in_avail >= LZMA_IN_REQUIRED) { 8950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->rc.in = b->in; 8960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->rc.in_pos = b->in_pos; 8970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 8980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (in_avail >= s->lzma2.compressed + LZMA_IN_REQUIRED) 8990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->rc.in_limit = b->in_pos + s->lzma2.compressed; 9000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync else 9010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->rc.in_limit = b->in_size - LZMA_IN_REQUIRED; 9020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!lzma_main(s)) 9040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return false; 9050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync in_avail = s->rc.in_pos - b->in_pos; 9070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (in_avail > s->lzma2.compressed) 9080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return false; 9090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.compressed -= in_avail; 9110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync b->in_pos = s->rc.in_pos; 9120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 9130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync in_avail = b->in_size - b->in_pos; 9150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (in_avail < LZMA_IN_REQUIRED) { 9160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (in_avail > s->lzma2.compressed) 9170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync in_avail = s->lzma2.compressed; 9180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync memcpy(s->temp.buf, b->in + b->in_pos, in_avail); 9200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->temp.size = in_avail; 9210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync b->in_pos += in_avail; 9220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 9230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return true; 9250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 9260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync/* 9280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Take care of the LZMA2 control layer, and forward the job of actual LZMA 9290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * decoding or copying of uncompressed chunks to other functions. 9300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 9310578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncXZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s, 9320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync struct xz_buf *b) 9330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 9340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t tmp; 9350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync while (b->in_pos < b->in_size || s->lzma2.sequence == SEQ_LZMA_RUN) { 9370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync switch (s->lzma2.sequence) { 9380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync case SEQ_CONTROL: 9390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 9400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * LZMA2 control byte 9410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 9420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Exact values: 9430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 0x00 End marker 9440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 0x01 Dictionary reset followed by 9450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * an uncompressed chunk 9460578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 0x02 Uncompressed chunk (no dictionary reset) 9470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 9480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Highest three bits (s->control & 0xE0): 9490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 0xE0 Dictionary reset, new properties and state 9500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * reset, followed by LZMA compressed chunk 9510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 0xC0 New properties and state reset, followed 9520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * by LZMA compressed chunk (no dictionary 9530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * reset) 9540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 0xA0 State reset using old properties, 9550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * followed by LZMA compressed chunk (no 9560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * dictionary reset) 9570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 0x80 LZMA chunk (no dictionary or state reset) 9580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 9590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * For LZMA compressed chunks, the lowest five bits 9600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * (s->control & 1F) are the highest bits of the 9610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * uncompressed size (bits 16-20). 9620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 9630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * A new LZMA2 stream must begin with a dictionary 9640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * reset. The first LZMA chunk must set new 9650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * properties and reset the LZMA state. 9660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * 9670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Values that don't match anything described above 9680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * are invalid and we return XZ_DATA_ERROR. 9690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 9700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync tmp = b->in[b->in_pos++]; 9710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9720578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (tmp == 0x00) 9730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_STREAM_END; 9740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (tmp >= 0xE0 || tmp == 0x01) { 9760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.need_props = true; 9770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.need_dict_reset = false; 9780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict_reset(&s->dict, b); 9790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else if (s->lzma2.need_dict_reset) { 9800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_DATA_ERROR; 9810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 9820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (tmp >= 0x80) { 9840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.uncompressed = (tmp & 0x1F) << 16; 9850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_UNCOMPRESSED_1; 9860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (tmp >= 0xC0) { 9880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 9890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * When there are new properties, 9900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * state reset is done at 9910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * SEQ_PROPERTIES. 9920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 9930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.need_props = false; 9940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.next_sequence 9950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync = SEQ_PROPERTIES; 9960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 9970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else if (s->lzma2.need_props) { 9980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_DATA_ERROR; 9990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 10010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.next_sequence 10020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync = SEQ_LZMA_PREPARE; 10030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (tmp >= 0xA0) 10040578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync lzma_reset(s); 10050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 10060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else { 10070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (tmp > 0x02) 10080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_DATA_ERROR; 10090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_COMPRESSED_0; 10110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.next_sequence = SEQ_COPY; 10120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 10130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync break; 10150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync case SEQ_UNCOMPRESSED_1: 10170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.uncompressed 10180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync += (uint32_t)b->in[b->in_pos++] << 8; 10190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_UNCOMPRESSED_2; 10200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync break; 10210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync case SEQ_UNCOMPRESSED_2: 10230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.uncompressed 10240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync += (uint32_t)b->in[b->in_pos++] + 1; 10250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_COMPRESSED_0; 10260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync break; 10270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10280578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync case SEQ_COMPRESSED_0: 10290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.compressed 10300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync = (uint32_t)b->in[b->in_pos++] << 8; 10310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_COMPRESSED_1; 10320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync break; 10330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync case SEQ_COMPRESSED_1: 10350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.compressed 10360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync += (uint32_t)b->in[b->in_pos++] + 1; 10370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = s->lzma2.next_sequence; 10380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync break; 10390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync case SEQ_PROPERTIES: 10410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!lzma_props(s, b->in[b->in_pos++])) 10420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_DATA_ERROR; 10430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_LZMA_PREPARE; 10450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10460578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync case SEQ_LZMA_PREPARE: 10470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->lzma2.compressed < RC_INIT_BYTES) 10480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_DATA_ERROR; 10490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!rc_read_init(&s->rc, b)) 10510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_OK; 10520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.compressed -= RC_INIT_BYTES; 10540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_LZMA_RUN; 10550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync case SEQ_LZMA_RUN: 10570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* 10580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * Set dictionary limit to indicate how much we want 10590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * to be encoded at maximum. Decode new data into the 10600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * dictionary. Flush the new data from dictionary to 10610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * b->out. Check if we finished decoding this chunk. 10620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * In case the dictionary got full but we didn't fill 10630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * the output buffer yet, we may run this loop 10640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync * multiple times without changing s->lzma2.sequence. 10650578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync */ 10660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict_limit(&s->dict, min_t(size_t, 10670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync b->out_size - b->out_pos, 10680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.uncompressed)); 10690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (!lzma2_lzma(s, b)) 10700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_DATA_ERROR; 10710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10720578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.uncompressed -= dict_flush(&s->dict, b); 10730578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10740578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->lzma2.uncompressed == 0) { 10750578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->lzma2.compressed > 0 || s->lzma.len > 0 10760578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync || !rc_is_finished(&s->rc)) 10770578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_DATA_ERROR; 10780578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10790578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync rc_reset(&s->rc); 10800578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_CONTROL; 10810578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10820578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else if (b->out_pos == b->out_size 10830578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync || (b->in_pos == b->in_size 10840578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync && s->temp.size 10850578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync < s->lzma2.compressed)) { 10860578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_OK; 10870578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 10880578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10890578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync break; 10900578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10910578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync case SEQ_COPY: 10920578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync dict_uncompressed(&s->dict, b, &s->lzma2.compressed); 10930578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->lzma2.compressed > 0) 10940578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_OK; 10950578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 10960578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_CONTROL; 10970578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync break; 10980578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 10990578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 11000578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11010578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_OK; 11020578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 11030578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11040578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncXZ_EXTERN struct xz_dec_lzma2 *xz_dec_lzma2_create(enum xz_mode mode, 11050578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync uint32_t dict_max) 11060578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 11070578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync struct xz_dec_lzma2 *s = kmalloc(sizeof(*s), GFP_KERNEL); 11080578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s == NULL) 11090578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return NULL; 11100578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11110578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.mode = mode; 11120578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.size_max = dict_max; 11130578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11140578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (DEC_IS_PREALLOC(mode)) { 11150578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.buf = vmalloc(dict_max); 11160578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->dict.buf == NULL) { 11170578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync kfree(s); 11180578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return NULL; 11190578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 11200578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } else if (DEC_IS_DYNALLOC(mode)) { 11210578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.buf = NULL; 11220578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.allocated = 0; 11230578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 11240578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11250578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return s; 11260578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 11270578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11280578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncXZ_EXTERN enum xz_ret xz_dec_lzma2_reset(struct xz_dec_lzma2 *s, uint8_t props) 11290578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 11300578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync /* This limits dictionary size to 3 GiB to keep parsing simpler. */ 11310578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (props > 39) 11320578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_OPTIONS_ERROR; 11330578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11340578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.size = 2 + (props & 1); 11350578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.size <<= (props >> 1) + 11; 11360578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11370578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (DEC_IS_MULTI(s->dict.mode)) { 11380578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->dict.size > s->dict.size_max) 11390578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_MEMLIMIT_ERROR; 11400578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11410578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.end = s->dict.size; 11420578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11430578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (DEC_IS_DYNALLOC(s->dict.mode)) { 11440578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->dict.allocated < s->dict.size) { 11450578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync vfree(s->dict.buf); 11460578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.buf = vmalloc(s->dict.size); 11470578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (s->dict.buf == NULL) { 11480578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->dict.allocated = 0; 11490578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_MEM_ERROR; 11500578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 11510578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 11520578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 11530578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync } 11540578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11550578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma.len = 0; 11560578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11570578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.sequence = SEQ_CONTROL; 11580578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->lzma2.need_dict_reset = true; 11590578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11600578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync s->temp.size = 0; 11610578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11620578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync return XZ_OK; 11630578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 11640578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11650578287ba49f36d031f6d61bb53f5b54f56c65a3repo syncXZ_EXTERN void xz_dec_lzma2_end(struct xz_dec_lzma2 *s) 11660578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync{ 11670578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync if (DEC_IS_MULTI(s->dict.mode)) 11680578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync vfree(s->dict.buf); 11690578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync 11700578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync kfree(s); 11710578287ba49f36d031f6d61bb53f5b54f56c65a3repo sync} 1172