19e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* deflate.c -- compress data using the deflation algorithm 204351a92ecc8429c999acbfc5dfe5aa8bee1d19dElliott Hughes * Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler 39e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For conditions of distribution and use, see copyright notice in zlib.h 49e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 59e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 69e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 79e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * ALGORITHM 89e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 99e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * The "deflation" process depends on being able to identify portions 109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of the input text which are identical to earlier input (within a 119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * sliding window trailing behind the input currently being processed). 129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * The most straightforward technique turns out to be the fastest for 149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * most input files: try all possible matches and select the longest. 159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * The key feature of this algorithm is that insertions into the string 169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * dictionary are very simple and thus fast, and deletions are avoided 179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * completely. Insertions are performed at each input character, whereas 189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * string matches are performed only when the previous match ends. So it 199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * is preferable to spend more time in matches to allow very fast string 209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * insertions and avoid deletions. The matching algorithm for small 219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strings is inspired from that of Rabin & Karp. A brute force approach 229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * is used to find longer strings when a small match has been found. 239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * A similar algorithm is used in comic (by Jan-Mark Wams) and freeze 249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (by Leonid Broukhis). 259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * A previous version of this file used a more sophisticated algorithm 269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (by Fiala and Greene) which is guaranteed to run in linear amortized 279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * time, but has a larger average cost, uses more memory and is patented. 289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * However the F&G algorithm may be faster for some highly redundant 299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * files if the parameter max_chain_length (described below) is too large. 309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * ACKNOWLEDGEMENTS 329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * The idea of lazy evaluation of matches is due to Jan-Mark Wams, and 349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * I found it in 'freeze' written by Leonid Broukhis. 359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Thanks to many people for bug reports and testing. 369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * REFERENCES 389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Deutsch, L.P.,"DEFLATE Compressed Data Format Specification". 40ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes * Available in http://tools.ietf.org/html/rfc1951 419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * A description of the Rabin and Karp algorithm is given in the book 439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * "Algorithms" by R. Sedgewick, Addison-Wesley, p252. 449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Fiala,E.R., and Greene,D.H. 469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595 479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* @(#) $Id$ */ 519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#include "deflate.h" 539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectconst char deflate_copyright[] = 5504351a92ecc8429c999acbfc5dfe5aa8bee1d19dElliott Hughes " deflate 1.2.8 Copyright 1995-2013 Jean-loup Gailly and Mark Adler "; 569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project If you use the zlib library in a product, an acknowledgment is welcome 589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project in the documentation of your product. If for some reason you cannot 599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project include such an acknowledgment, I would appreciate that you keep this 609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project copyright string in the executable of your product. 619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Function prototypes. 659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projecttypedef enum { 679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project need_more, /* block not completed, need more input or more output */ 689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project block_done, /* block flush performed */ 699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project finish_started, /* finish started, need only more output at next deflate */ 709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project finish_done /* finish done, accept no more input or output */ 719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} block_state; 729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projecttypedef block_state (*compress_func) OF((deflate_state *s, int flush)); 749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Compression function. Returns the block state after the call. */ 759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void fill_window OF((deflate_state *s)); 779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_stored OF((deflate_state *s, int flush)); 789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_fast OF((deflate_state *s, int flush)); 799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_slow OF((deflate_state *s, int flush)); 819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 82381716e9396b55b1adb8235b020c37344f60ab07Elliott Hugheslocal block_state deflate_rle OF((deflate_state *s, int flush)); 83381716e9396b55b1adb8235b020c37344f60ab07Elliott Hugheslocal block_state deflate_huff OF((deflate_state *s, int flush)); 849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void lm_init OF((deflate_state *s)); 859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void putShortMSB OF((deflate_state *s, uInt b)); 869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void flush_pending OF((z_streamp strm)); 879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal int read_buf OF((z_streamp strm, Bytef *buf, unsigned size)); 889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef ASMV 899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project void match_init OF((void)); /* asm code initialization */ 909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt longest_match OF((deflate_state *s, IPos cur_match)); 919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal uInt longest_match OF((deflate_state *s, IPos cur_match)); 939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef DEBUG 969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void check_match OF((deflate_state *s, IPos start, IPos match, 979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int length)); 989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 1019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Local data 1029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define NIL 0 1059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Tail of hash chains */ 1069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef TOO_FAR 1089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project# define TOO_FAR 4096 1099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */ 1119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Values for max_lazy_match, good_match and max_chain_length, depending on 1139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the desired pack level (0..9). The values given below have been tuned to 1149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * exclude worst case performance for pathological files. Better values may be 1159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * found for specific files. 1169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projecttypedef struct config_s { 1189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ush good_length; /* reduce lazy search above this match length */ 1199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ush max_lazy; /* do not perform lazy search above this match length */ 1209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ush nice_length; /* quit search above this match length */ 1219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ush max_chain; 1229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project compress_func func; 1239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} config; 1249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef FASTEST 1269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal const config configuration_table[2] = { 1279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* good lazy nice chain */ 1289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ 1299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 1 */ {4, 4, 8, 4, deflate_fast}}; /* max speed, no lazy matches */ 1309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 1319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal const config configuration_table[10] = { 1329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* good lazy nice chain */ 1339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ 1349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 1 */ {4, 4, 8, 4, deflate_fast}, /* max speed, no lazy matches */ 1359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 2 */ {4, 5, 16, 8, deflate_fast}, 1369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 3 */ {4, 6, 32, 32, deflate_fast}, 1379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 4 */ {4, 4, 16, 16, deflate_slow}, /* lazy matches */ 1399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 5 */ {8, 16, 32, 32, deflate_slow}, 1409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 6 */ {8, 16, 128, 128, deflate_slow}, 1419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 7 */ {8, 32, 128, 256, deflate_slow}, 1429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 8 */ {32, 128, 258, 1024, deflate_slow}, 1439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 9 */ {32, 258, 258, 4096, deflate_slow}}; /* max compression */ 1449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4 1479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For deflate_fast() (levels <= 3) good is ignored and lazy has a different 1489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * meaning. 1499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define EQUAL 0 1529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* result of memcmp for equal strings */ 1539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef NO_DUMMY_DECL 1559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectstruct static_tree_desc_s {int dummy;}; /* for buggy compilers */ 1569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 158ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes/* rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH */ 159ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#define RANK(f) (((f) << 1) - ((f) > 4 ? 9 : 0)) 160ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes 1619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 1629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Update a hash value with the given input byte 1639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: all calls to to UPDATE_HASH are made with consecutive 1649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * input characters, so that a running hash key can be computed from the 1659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * previous key instead of complete recalculation each time. 1669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask) 1689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 1719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Insert string str in the dictionary and set match_head to the previous head 1729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of the hash chain (the most recent string with same hash key). Return 1739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the previous length of the hash chain. 1749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * If this file is compiled with -DFASTEST, the compression level is forced 1759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to 1, and no hash chains are maintained. 1769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: all calls to to INSERT_STRING are made with consecutive 1779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * input characters and the first MIN_MATCH bytes of str are valid 1789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (except for the last MIN_MATCH-1 bytes of the input file). 1799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef FASTEST 1819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define INSERT_STRING(s, str, match_head) \ 1829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ 1839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match_head = s->head[s->ins_h], \ 1849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->head[s->ins_h] = (Pos)(str)) 1859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 1869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define INSERT_STRING(s, str, match_head) \ 1879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ 1889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \ 1899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->head[s->ins_h] = (Pos)(str)) 1909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 1939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Initialize the hash table (avoiding 64K overflow for 16 bit systems). 1949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * prev[] will be initialized on the fly. 1959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define CLEAR_HASH(s) \ 1979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->head[s->hash_size-1] = NIL; \ 1989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head)); 1999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 2019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateInit_(strm, level, version, stream_size) 2029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 2039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int level; 2049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project const char *version; 2059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int stream_size; 2069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 2079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, 2089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Z_DEFAULT_STRATEGY, version, stream_size); 2099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* To do: ignore strm->next_in if we use it as window */ 2109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 2119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 2139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy, 2149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project version, stream_size) 2159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 2169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int level; 2179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int method; 2189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int windowBits; 2199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int memLevel; 2209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int strategy; 2219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project const char *version; 2229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int stream_size; 2239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 2249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 2259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int wrap = 1; 2269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project static const char my_version[] = ZLIB_VERSION; 2279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ushf *overlay; 2299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* We overlay pending_buf and d_buf+l_buf. This works since the average 2309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * output size for (length,distance) codes is <= 24 bits. 2319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 2329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (version == Z_NULL || version[0] != my_version[0] || 2349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project stream_size != sizeof(z_stream)) { 2359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_VERSION_ERROR; 2369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 2379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL) return Z_STREAM_ERROR; 2389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->msg = Z_NULL; 2409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->zalloc == (alloc_func)0) { 241ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#ifdef Z_SOLO 242ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return Z_STREAM_ERROR; 243ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#else 2449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->zalloc = zcalloc; 2459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->opaque = (voidpf)0; 246ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#endif 2479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 248ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (strm->zfree == (free_func)0) 249ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#ifdef Z_SOLO 250ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return Z_STREAM_ERROR; 251ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#else 252ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes strm->zfree = zcfree; 253ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#endif 2549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef FASTEST 2569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level != 0) level = 1; 2579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 2589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level == Z_DEFAULT_COMPRESSION) level = 6; 2599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 2609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (windowBits < 0) { /* suppress zlib wrapper */ 2629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project wrap = 0; 2639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project windowBits = -windowBits; 2649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 2659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 2669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else if (windowBits > 15) { 2679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project wrap = 2; /* write gzip wrapper instead */ 2689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project windowBits -= 16; 2699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 2709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 2719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED || 2729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project windowBits < 8 || windowBits > 15 || level < 0 || level > 9 || 2739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strategy < 0 || strategy > Z_FIXED) { 2749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 2759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 2769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (windowBits == 8) windowBits = 9; /* until 256-byte window bug fixed */ 2779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state)); 2789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s == Z_NULL) return Z_MEM_ERROR; 2799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state = (struct internal_state FAR *)s; 2809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strm = strm; 2819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->wrap = wrap; 2839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzhead = Z_NULL; 2849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->w_bits = windowBits; 2859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->w_size = 1 << s->w_bits; 2869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->w_mask = s->w_size - 1; 2879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->hash_bits = memLevel + 7; 2899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->hash_size = 1 << s->hash_bits; 2909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->hash_mask = s->hash_size - 1; 2919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH); 2929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte)); 2949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos)); 2959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos)); 2969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 297381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->high_water = 0; /* nothing written to s->window yet */ 298381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 2999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */ 3009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2); 3029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending_buf = (uchf *) overlay; 3039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L); 3049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL || 3069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending_buf == Z_NULL) { 3079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = FINISH_STATE; 30804351a92ecc8429c999acbfc5dfe5aa8bee1d19dElliott Hughes strm->msg = ERR_MSG(Z_MEM_ERROR); 3099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflateEnd (strm); 3109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_MEM_ERROR; 3119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 3129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->d_buf = overlay + s->lit_bufsize/sizeof(ush); 3139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize; 3149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->level = level; 3169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strategy = strategy; 3179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->method = (Byte)method; 3189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return deflateReset(strm); 3209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 3219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 3239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateSetDictionary (strm, dictionary, dictLength) 3249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 3259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project const Bytef *dictionary; 3269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt dictLength; 3279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 3289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 329ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes uInt str, n; 330ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes int wrap; 331ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes unsigned avail; 33204351a92ecc8429c999acbfc5dfe5aa8bee1d19dElliott Hughes z_const unsigned char *next; 3339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 334ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (strm == Z_NULL || strm->state == Z_NULL || dictionary == Z_NULL) 3359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 3369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 337ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes wrap = s->wrap; 338ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (wrap == 2 || (wrap == 1 && s->status != INIT_STATE) || s->lookahead) 339ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return Z_STREAM_ERROR; 3409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 341ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes /* when using zlib wrappers, compute Adler-32 for provided dictionary */ 342ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (wrap == 1) 343ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes strm->adler = adler32(strm->adler, dictionary, dictLength); 344ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->wrap = 0; /* avoid computing Adler-32 in read_buf */ 345ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes 346ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes /* if dictionary would fill window, just replace the history */ 347ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (dictLength >= s->w_size) { 348ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (wrap == 0) { /* already empty otherwise */ 349ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes CLEAR_HASH(s); 350ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->strstart = 0; 351ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->block_start = 0L; 352ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert = 0; 353ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } 354ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes dictionary += dictLength - s->w_size; /* use the tail */ 355ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes dictLength = s->w_size; 3569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 3579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 358ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes /* insert dictionary into window and hash */ 359ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes avail = strm->avail_in; 360ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes next = strm->next_in; 361ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes strm->avail_in = dictLength; 36204351a92ecc8429c999acbfc5dfe5aa8bee1d19dElliott Hughes strm->next_in = (z_const Bytef *)dictionary; 363ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes fill_window(s); 364ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes while (s->lookahead >= MIN_MATCH) { 365ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes str = s->strstart; 366ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes n = s->lookahead - (MIN_MATCH-1); 367ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes do { 368ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); 369ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#ifndef FASTEST 370ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->prev[str & s->w_mask] = s->head[s->ins_h]; 371ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#endif 372ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->head[s->ins_h] = (Pos)str; 373ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes str++; 374ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } while (--n); 375ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->strstart = str; 376ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->lookahead = MIN_MATCH-1; 377ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes fill_window(s); 3789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 379ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->strstart += s->lookahead; 380ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->block_start = (long)s->strstart; 381ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert = s->lookahead; 382ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->lookahead = 0; 383ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->match_length = s->prev_length = MIN_MATCH-1; 384ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->match_available = 0; 385ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes strm->next_in = next; 386ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes strm->avail_in = avail; 387ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->wrap = wrap; 3889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 3899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 3909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 392ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughesint ZEXPORT deflateResetKeep (strm) 3939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 3949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 3959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 3969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || 3989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0) { 3999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 4009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 4019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->total_in = strm->total_out = 0; 4039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */ 4049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->data_type = Z_UNKNOWN; 4059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = (deflate_state *)strm->state; 4079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending = 0; 4089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending_out = s->pending_buf; 4099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap < 0) { 4119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->wrap = -s->wrap; /* was made negative by deflate(..., Z_FINISH); */ 4129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 4139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = s->wrap ? INIT_STATE : BUSY_STATE; 4149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = 4159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 4169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->wrap == 2 ? crc32(0L, Z_NULL, 0) : 4179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 4189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project adler32(0L, Z_NULL, 0); 4199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = Z_NO_FLUSH; 4209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_init(s); 4229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 4249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 4259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 427ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughesint ZEXPORT deflateReset (strm) 428ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes z_streamp strm; 429ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes{ 430ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes int ret; 431ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes 432ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes ret = deflateResetKeep(strm); 433ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (ret == Z_OK) 434ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes lm_init(strm->state); 435ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return ret; 436ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes} 437ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes 438ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes/* ========================================================================= */ 4399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateSetHeader (strm, head) 4409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 4419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project gz_headerp head; 4429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 4439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 4449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->state->wrap != 2) return Z_STREAM_ERROR; 4459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state->gzhead = head; 4469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 4479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 4489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 450ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughesint ZEXPORT deflatePending (strm, pending, bits) 451ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes unsigned *pending; 452ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes int *bits; 453ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes z_streamp strm; 454ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes{ 455ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 456ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (pending != Z_NULL) 457ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes *pending = strm->state->pending; 458ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (bits != Z_NULL) 459ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes *bits = strm->state->bi_valid; 460ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return Z_OK; 461ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes} 462ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes 463ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes/* ========================================================================= */ 4649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflatePrime (strm, bits, value) 4659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 4669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int bits; 4679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int value; 4689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 469ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes deflate_state *s; 470ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes int put; 471ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes 4729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 473ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s = strm->state; 474ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3)) 475ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return Z_BUF_ERROR; 476ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes do { 477ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes put = Buf_size - s->bi_valid; 478ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (put > bits) 479ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes put = bits; 480ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->bi_buf |= (ush)((value & ((1 << put) - 1)) << s->bi_valid); 481ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->bi_valid += put; 482ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes _tr_flush_bits(s); 483ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes value >>= put; 484ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes bits -= put; 485ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } while (bits); 4869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 4879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 4889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 4909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateParams(strm, level, strategy) 4919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 4929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int level; 4939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int strategy; 4949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 4959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 4969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project compress_func func; 4979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int err = Z_OK; 4989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 5009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 5019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef FASTEST 5039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level != 0) level = 1; 5049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 5059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level == Z_DEFAULT_COMPRESSION) level = 6; 5069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 5079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) { 5089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 5099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 5109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project func = configuration_table[s->level].func; 5119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 512381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if ((strategy != s->strategy || func != configuration_table[level].func) && 513381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes strm->total_in != 0) { 5149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Flush the last buffer: */ 515381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes err = deflate(strm, Z_BLOCK); 51604351a92ecc8429c999acbfc5dfe5aa8bee1d19dElliott Hughes if (err == Z_BUF_ERROR && s->pending == 0) 51704351a92ecc8429c999acbfc5dfe5aa8bee1d19dElliott Hughes err = Z_OK; 5189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 5199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->level != level) { 5209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->level = level; 5219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_lazy_match = configuration_table[level].max_lazy; 5229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->good_match = configuration_table[level].good_length; 5239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->nice_match = configuration_table[level].nice_length; 5249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_chain_length = configuration_table[level].max_chain; 5259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 5269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strategy = strategy; 5279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return err; 5289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 5299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 5319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain) 5329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 5339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int good_length; 5349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int max_lazy; 5359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int nice_length; 5369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int max_chain; 5379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 5389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 5399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 5419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 5429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->good_match = good_length; 5439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_lazy_match = max_lazy; 5449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->nice_match = nice_length; 5459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_chain_length = max_chain; 5469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 5479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 5489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= 5509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For the default windowBits of 15 and memLevel of 8, this function returns 5519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * a close to exact, as well as small, upper bound on the compressed size. 5529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * They are coded as constants here for a reason--if the #define's are 5539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * changed, then this function needs to be changed as well. The return 5549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * value for 15 and 8 only works for those exact settings. 5559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 5569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For any setting other than those defaults for windowBits and memLevel, 5579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the value returned is a conservative worst case for the maximum expansion 5589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * resulting from using fixed blocks instead of stored blocks, which deflate 5599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * can emit on compressed data for some combinations of the parameters. 5609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 561381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * This function could be more sophisticated to provide closer upper bounds for 562381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * every combination of windowBits and memLevel. But even the conservative 563381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * upper bound of about 14% expansion does not seem onerous for output buffer 564381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * allocation. 5659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 5669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source ProjectuLong ZEXPORT deflateBound(strm, sourceLen) 5679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 5689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uLong sourceLen; 5699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 5709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 571381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes uLong complen, wraplen; 572381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes Bytef *str; 5739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 574381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* conservative upper bound for compressed data */ 575381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes complen = sourceLen + 576381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5; 5779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 578381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* if can't get parameters, return conservative bound plus zlib wrapper */ 5799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) 580381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes return complen + 6; 5819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 582381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* compute wrapper length */ 5839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 584381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes switch (s->wrap) { 585381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes case 0: /* raw deflate */ 586381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes wraplen = 0; 587381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes break; 588381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes case 1: /* zlib wrapper */ 589381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes wraplen = 6 + (s->strstart ? 4 : 0); 590381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes break; 591381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes case 2: /* gzip wrapper */ 592381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes wraplen = 18; 593381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->gzhead != Z_NULL) { /* user-supplied gzip header */ 594381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->gzhead->extra != Z_NULL) 595381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes wraplen += 2 + s->gzhead->extra_len; 596381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes str = s->gzhead->name; 597381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (str != Z_NULL) 598381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes do { 599381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes wraplen++; 600381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } while (*str++); 601381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes str = s->gzhead->comment; 602381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (str != Z_NULL) 603381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes do { 604381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes wraplen++; 605381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } while (*str++); 606381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->gzhead->hcrc) 607381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes wraplen += 2; 608381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 609381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes break; 610381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes default: /* for compiler happiness */ 611381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes wraplen = 6; 612381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 613381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 614381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* if not default parameters, return conservative bound */ 6159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->w_bits != 15 || s->hash_bits != 8 + 7) 616381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes return complen + wraplen; 6179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* default settings: return tight bound for that case */ 619381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + 620381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes (sourceLen >> 25) + 13 - 6 + wraplen; 6219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 6229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= 6249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Put a short in the pending buffer. The 16-bit value is put in MSB order. 6259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: the stream state is correct and there is enough room in 6269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * pending_buf. 6279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 6289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void putShortMSB (s, b) 6299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 6309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt b; 6319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 6329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(b >> 8)); 6339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(b & 0xff)); 6349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 6359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= 6379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Flush as much pending output as possible. All deflate() output goes 6389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * through this function so some applications may wish to modify it 6399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to avoid allocating a large strm->next_out buffer and copying into it. 6409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (See also read_buf()). 6419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 6429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void flush_pending(strm) 6439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 6449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 645ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes unsigned len; 646ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes deflate_state *s = strm->state; 6479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 648ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes _tr_flush_bits(s); 649ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes len = s->pending; 6509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len > strm->avail_out) len = strm->avail_out; 6519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len == 0) return; 6529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 653ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes zmemcpy(strm->next_out, s->pending_out, len); 6549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->next_out += len; 655ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->pending_out += len; 6569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->total_out += len; 6579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->avail_out -= len; 658ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->pending -= len; 659ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->pending == 0) { 660ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->pending_out = s->pending_buf; 6619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 6639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 6659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflate (strm, flush) 6669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 6679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 6689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 6699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int old_flush; /* value of flush param for previous deflate call */ 6709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 6719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || 673381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes flush > Z_BLOCK || flush < 0) { 6749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 6759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 6779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->next_out == Z_NULL || 6799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (strm->next_in == Z_NULL && strm->avail_in != 0) || 6809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->status == FINISH_STATE && flush != Z_FINISH)) { 6819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ERR_RETURN(strm, Z_STREAM_ERROR); 6829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR); 6849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strm = strm; /* just in case */ 6869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project old_flush = s->last_flush; 6879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = flush; 6889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Write the header */ 6909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == INIT_STATE) { 6919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 6929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap == 2) { 6939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(0L, Z_NULL, 0); 6949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 31); 6959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 139); 6969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 8); 697381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->gzhead == Z_NULL) { 6989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 6999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 7009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 7019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 7029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 7039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->level == 9 ? 2 : 7049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? 7059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4 : 0)); 7069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, OS_CODE); 7079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = BUSY_STATE; 7089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else { 7109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (s->gzhead->text ? 1 : 0) + 7119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->gzhead->hcrc ? 2 : 0) + 7129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->gzhead->extra == Z_NULL ? 0 : 4) + 7139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->gzhead->name == Z_NULL ? 0 : 8) + 7149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->gzhead->comment == Z_NULL ? 0 : 16) 7159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ); 7169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(s->gzhead->time & 0xff)); 7179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff)); 7189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff)); 7199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff)); 7209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->level == 9 ? 2 : 7219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? 7229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4 : 0)); 7239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->gzhead->os & 0xff); 724381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->gzhead->extra != Z_NULL) { 7259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->gzhead->extra_len & 0xff); 7269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (s->gzhead->extra_len >> 8) & 0xff); 7279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc) 7299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf, 7309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending); 7319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzindex = 0; 7329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = EXTRA_STATE; 7339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 7369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 7379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 7389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8; 7399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt level_flags; 7409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2) 7429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project level_flags = 0; 7439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else if (s->level < 6) 7449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project level_flags = 1; 7459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else if (s->level == 6) 7469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project level_flags = 2; 7479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 7489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project level_flags = 3; 7499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project header |= (level_flags << 6); 7509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart != 0) header |= PRESET_DICT; 7519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project header += 31 - (header % 31); 7529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = BUSY_STATE; 7549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, header); 7559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Save the adler32 of the preset dictionary: */ 7579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart != 0) { 7589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, (uInt)(strm->adler >> 16)); 7599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, (uInt)(strm->adler & 0xffff)); 7609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = adler32(0L, Z_NULL, 0); 7629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 7659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == EXTRA_STATE) { 766381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->gzhead->extra != Z_NULL) { 7679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 7689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project while (s->gzindex < (s->gzhead->extra_len & 0xffff)) { 7709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 7719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 7749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 7759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project beg = s->pending; 7769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) 7779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project break; 7789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->gzhead->extra[s->gzindex]); 7809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzindex++; 7819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 7859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzindex == s->gzhead->extra_len) { 7869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzindex = 0; 7879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = NAME_STATE; 7889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 7919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = NAME_STATE; 7929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == NAME_STATE) { 794381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->gzhead->name != Z_NULL) { 7959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 7969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int val; 7979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 7999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 8009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 8019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 8029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 8039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 8049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project beg = s->pending; 8059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 8069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project val = 1; 8079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project break; 8089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project val = s->gzhead->name[s->gzindex++]; 8119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, val); 8129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (val != 0); 8139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 8149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 8159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 8169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (val == 0) { 8179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzindex = 0; 8189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = COMMENT_STATE; 8199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 8229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = COMMENT_STATE; 8239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == COMMENT_STATE) { 825381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->gzhead->comment != Z_NULL) { 8269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 8279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int val; 8289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 8309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 8319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 8329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 8339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 8349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 8359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project beg = s->pending; 8369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 8379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project val = 1; 8389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project break; 8399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project val = s->gzhead->comment[s->gzindex++]; 8429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, val); 8439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (val != 0); 8449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 8459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 8469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 8479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (val == 0) 8489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = HCRC_STATE; 8499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 8519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = HCRC_STATE; 8529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == HCRC_STATE) { 8549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc) { 8559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending + 2 > s->pending_buf_size) 8569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 8579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending + 2 <= s->pending_buf_size) { 8589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(strm->adler & 0xff)); 8599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); 8609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(0L, Z_NULL, 0); 8619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = BUSY_STATE; 8629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 8659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = BUSY_STATE; 8669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 8689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Flush as much pending output as possible */ 8709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending != 0) { 8719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 8729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_out == 0) { 8739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Since avail_out is 0, deflate will be called again with 8749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * more output space, but possibly with both pending and 8759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * avail_in equal to zero. There won't be anything to do, 8769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * but this is not an error situation so make sure we 8779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * return OK instead of BUF_ERROR at next call of deflate: 8789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 8799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = -1; 8809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 8819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Make sure there is something to do and avoid duplicate consecutive 8849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * flushes. For repeated and useless calls with Z_FINISH, we keep 8859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * returning Z_STREAM_END instead of Z_BUF_ERROR. 8869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 887ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } else if (strm->avail_in == 0 && RANK(flush) <= RANK(old_flush) && 8889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush != Z_FINISH) { 8899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ERR_RETURN(strm, Z_BUF_ERROR); 8909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* User must not provide more input after the first FINISH: */ 8939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == FINISH_STATE && strm->avail_in != 0) { 8949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ERR_RETURN(strm, Z_BUF_ERROR); 8959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Start a new block or continue the current one. 8989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 8999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_in != 0 || s->lookahead != 0 || 9009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) { 9019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project block_state bstate; 9029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 903381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes bstate = s->strategy == Z_HUFFMAN_ONLY ? deflate_huff(s, flush) : 904381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes (s->strategy == Z_RLE ? deflate_rle(s, flush) : 905381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes (*(configuration_table[s->level].func))(s, flush)); 9069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bstate == finish_started || bstate == finish_done) { 9089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = FINISH_STATE; 9099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bstate == need_more || bstate == finish_started) { 9119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_out == 0) { 9129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = -1; /* avoid BUF_ERROR next call, see above */ 9139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 9159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If flush != Z_NO_FLUSH && avail_out == 0, the next call 9169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of deflate should use the same flush parameter to make sure 9179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * that the flush is complete. So we don't have to output an 9189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * empty block here, this will be done at next call. This also 9199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * ensures that for a very small output buffer, we emit at most 9209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * one empty block. 9219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 9229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bstate == block_done) { 9249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (flush == Z_PARTIAL_FLUSH) { 9259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_align(s); 926381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } else if (flush != Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */ 9279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_stored_block(s, (char*)0, 0L, 0); 9289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* For a full flush, this empty block will be recognized 9299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * as a special marker by inflate_sync(). 9309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 9319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (flush == Z_FULL_FLUSH) { 9329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project CLEAR_HASH(s); /* forget history */ 933381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->lookahead == 0) { 934381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->strstart = 0; 935381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->block_start = 0L; 936ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert = 0; 937381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 9389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 9419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_out == 0) { 9429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */ 9439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 9449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(strm->avail_out > 0, "bug2"); 9489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (flush != Z_FINISH) return Z_OK; 9509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap <= 0) return Z_STREAM_END; 9519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Write the trailer */ 9539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 9549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap == 2) { 9559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(strm->adler & 0xff)); 9569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); 9579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->adler >> 16) & 0xff)); 9589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->adler >> 24) & 0xff)); 9599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(strm->total_in & 0xff)); 9609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 8) & 0xff)); 9619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 16) & 0xff)); 9629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 24) & 0xff)); 9639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 9659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 9669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 9679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, (uInt)(strm->adler >> 16)); 9689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, (uInt)(strm->adler & 0xffff)); 9699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 9719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If avail_out is zero, the application will call deflate again 9729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to flush the rest. 9739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 9749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap > 0) s->wrap = -s->wrap; /* write the trailer only once! */ 9759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return s->pending != 0 ? Z_OK : Z_STREAM_END; 9769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 9779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 9799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateEnd (strm) 9809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 9819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 9829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int status; 9839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 9859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status = strm->state->status; 9879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (status != INIT_STATE && 9889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != EXTRA_STATE && 9899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != NAME_STATE && 9909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != COMMENT_STATE && 9919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != HCRC_STATE && 9929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != BUSY_STATE && 9939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != FINISH_STATE) { 9949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 9959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Deallocate in reverse order of allocations: */ 9989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project TRY_FREE(strm, strm->state->pending_buf); 9999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project TRY_FREE(strm, strm->state->head); 10009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project TRY_FREE(strm, strm->state->prev); 10019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project TRY_FREE(strm, strm->state->window); 10029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ZFREE(strm, strm->state); 10049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state = Z_NULL; 10059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK; 10079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 10089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= 10109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Copy the source state to the destination state. 10119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * To simplify the source, this is not supported for 16-bit MSDOS (which 10129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * doesn't have enough memory anyway to duplicate compression states). 10139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateCopy (dest, source) 10159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp dest; 10169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp source; 10179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 10189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef MAXSEG_64K 10199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 10209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 10219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *ds; 10229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *ss; 10239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ushf *overlay; 10249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (source == Z_NULL || dest == Z_NULL || source->state == Z_NULL) { 10279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 10289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 10299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ss = source->state; 10319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1032ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream)); 10339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state)); 10359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (ds == Z_NULL) return Z_MEM_ERROR; 10369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project dest->state = (struct internal_state FAR *) ds; 1037ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes zmemcpy((voidpf)ds, (voidpf)ss, sizeof(deflate_state)); 10389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->strm = dest; 10399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte)); 10419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->prev = (Posf *) ZALLOC(dest, ds->w_size, sizeof(Pos)); 10429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->head = (Posf *) ZALLOC(dest, ds->hash_size, sizeof(Pos)); 10439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2); 10449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->pending_buf = (uchf *) overlay; 10459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL || 10479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->pending_buf == Z_NULL) { 10489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflateEnd (dest); 10499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_MEM_ERROR; 10509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 10519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* following zmemcpy do not work for 16-bit MSDOS */ 10529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte)); 1053ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes zmemcpy((voidpf)ds->prev, (voidpf)ss->prev, ds->w_size * sizeof(Pos)); 1054ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes zmemcpy((voidpf)ds->head, (voidpf)ss->head, ds->hash_size * sizeof(Pos)); 10559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size); 10569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf); 10589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush); 10599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize; 10609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->l_desc.dyn_tree = ds->dyn_ltree; 10629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->d_desc.dyn_tree = ds->dyn_dtree; 10639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->bl_desc.dyn_tree = ds->bl_tree; 10649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 10669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* MAXSEG_64K */ 10679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 10689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 10709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Read a new buffer from the current input stream, update the adler32 10719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * and total number of bytes read. All deflate() input goes through 10729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * this function so some applications may wish to modify it to avoid 10739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * allocating a large strm->next_in buffer and copying from it. 10749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (See also flush_pending()). 10759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal int read_buf(strm, buf, size) 10779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 10789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Bytef *buf; 10799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project unsigned size; 10809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 10819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project unsigned len = strm->avail_in; 10829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len > size) len = size; 10849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len == 0) return 0; 10859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->avail_in -= len; 10879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1088ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes zmemcpy(buf, strm->next_in, len); 10899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->state->wrap == 1) { 1090ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes strm->adler = adler32(strm->adler, buf, len); 10919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 10929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 10939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else if (strm->state->wrap == 2) { 1094ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes strm->adler = crc32(strm->adler, buf, len); 10959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 10969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 10979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->next_in += len; 10989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->total_in += len; 10999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return (int)len; 11019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 11029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 11049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Initialize the "longest match" routines for a new zlib stream 11059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void lm_init (s) 11079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 11089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 11099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->window_size = (ulg)2L*s->w_size; 11109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project CLEAR_HASH(s); 11129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Set the default configuration parameters: 11149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_lazy_match = configuration_table[s->level].max_lazy; 11169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->good_match = configuration_table[s->level].good_length; 11179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->nice_match = configuration_table[s->level].nice_length; 11189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_chain_length = configuration_table[s->level].max_chain; 11199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart = 0; 11219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->block_start = 0L; 11229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead = 0; 1123ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert = 0; 11249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = s->prev_length = MIN_MATCH-1; 11259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_available = 0; 11269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->ins_h = 0; 11279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 11289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef ASMV 11299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match_init(); /* initialize the asm code */ 11309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 11319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 11329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 11339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 11359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 11369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Set match_start to the longest match starting at the given string and 11379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * return its length. Matches shorter or equal to prev_length are discarded, 11389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * in which case the result is equal to prev_length and match_start is 11399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * garbage. 11409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertions: cur_match is the head of the hash chain for the current 11419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1 11429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * OUT assertion: the match length is not greater than s->lookahead. 11439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef ASMV 11459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* For 80x86 and 680x0, an optimized version will be provided in match.asm or 11469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * match.S. The code will be functionally equivalent. 11479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal uInt longest_match(s, cur_match) 11499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 11509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos cur_match; /* current match */ 11519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 11529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project unsigned chain_length = s->max_chain_length;/* max hash chain length */ 11539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *scan = s->window + s->strstart; /* current string */ 11549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *match; /* matched string */ 11559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register int len; /* length of current match */ 11569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int best_len = s->prev_length; /* best match length so far */ 11579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int nice_match = s->nice_match; /* stop if match long enough */ 11589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos limit = s->strstart > (IPos)MAX_DIST(s) ? 11599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart - (IPos)MAX_DIST(s) : NIL; 11609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Stop when cur_match becomes <= limit. To simplify the code, 11619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * we prevent matches with the string of window index 0. 11629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Posf *prev = s->prev; 11649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt wmask = s->w_mask; 11659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef UNALIGNED_OK 11679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Compare two bytes at a time. Note: this is not always beneficial. 11689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Try with and without -DUNALIGNED_OK to check. 11699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1; 11719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register ush scan_start = *(ushf*)scan; 11729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register ush scan_end = *(ushf*)(scan+best_len-1); 11739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 11749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH; 11759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Byte scan_end1 = scan[best_len-1]; 11769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Byte scan_end = scan[best_len]; 11779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 11789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. 11809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * It is easy to get rid of this optimization if necessary. 11819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); 11839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Do not waste too much time if we already have a good match: */ 11859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->prev_length >= s->good_match) { 11869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project chain_length >>= 2; 11879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 11889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Do not look for matches beyond the end of the input. This is necessary 11899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to make deflate deterministic. 11909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead; 11929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); 11949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 11969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(cur_match < s->strstart, "no future"); 11979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match = s->window + cur_match; 11989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Skip to next match if the match length cannot increase 12009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * or if the match length is less than 2. Note that the checks below 12019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * for insufficient lookahead only occur occasionally for performance 12029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * reasons. Therefore uninitialized memory will be accessed, and 12039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * conditional jumps will be made that depend on those values. 12049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * However the length of the match is limited to the lookahead, so 12059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the output of deflate is not affected by the uninitialized values. 12069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#if (defined(UNALIGNED_OK) && MAX_MATCH == 258) 12089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* This code assumes sizeof(unsigned short) == 2. Do not use 12099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * UNALIGNED_OK if your compiler uses a different size. 12109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (*(ushf*)(match+best_len-1) != scan_end || 12129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *(ushf*)match != scan_start) continue; 12139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* It is not necessary to compare scan[2] and match[2] since they are 12159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * always equal when the other bytes match, given that the hash keys 12169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at 12179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart+3, +5, ... up to strstart+257. We check for insufficient 12189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * lookahead only every 4th comparison; the 128th check will be made 12199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is 12209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * necessary to put more guard bytes at the end of the window, or 12219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to check more often for insufficient lookahead. 12229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(scan[2] == match[2], "scan[2]?"); 12249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan++, match++; 12259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 12269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) && 12279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 12289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 12299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 12309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan < strend); 12319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The funny "do {}" generates better code on most compilers */ 12329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Here, scan <= window+strstart+257 */ 12349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 12359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (*scan == *match) scan++; 12369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project len = (MAX_MATCH - 1) - (int)(strend-scan); 12389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan = strend - (MAX_MATCH-1); 12399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else /* UNALIGNED_OK */ 12419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (match[best_len] != scan_end || 12439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match[best_len-1] != scan_end1 || 12449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *match != *scan || 12459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++match != scan[1]) continue; 12469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The check at best_len-1 can be removed because it will be made 12489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * again later. (This heuristic is not always a win.) 12499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * It is not necessary to compare scan[2] and match[2] since they 12509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * are always equal when the other bytes match, given that 12519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the hash keys are equal and that HASH_BITS >= 8. 12529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan += 2, match++; 12549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(*scan == *match, "match[2]?"); 12559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* We check for insufficient lookahead only every 8th comparison; 12579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the 256th check will be made at strstart+258. 12589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 12609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (*++scan == *++match && *++scan == *++match && 12619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 12629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 12639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 12649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan < strend); 12659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 12679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project len = MAX_MATCH - (int)(strend - scan); 12699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan = strend - MAX_MATCH; 12709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* UNALIGNED_OK */ 12729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len > best_len) { 12749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_start = cur_match; 12759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project best_len = len; 12769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len >= nice_match) break; 12779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef UNALIGNED_OK 12789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan_end = *(ushf*)(scan+best_len-1); 12799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 12809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan_end1 = scan[best_len-1]; 12819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan_end = scan[best_len]; 12829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 12839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 12849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while ((cur_match = prev[cur_match & wmask]) > limit 12859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project && --chain_length != 0); 12869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if ((uInt)best_len <= s->lookahead) return (uInt)best_len; 12889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return s->lookahead; 12899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 12909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* ASMV */ 1291381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 1292381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes#else /* FASTEST */ 12939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* --------------------------------------------------------------------------- 1295381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * Optimized version for FASTEST only 12969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1297381716e9396b55b1adb8235b020c37344f60ab07Elliott Hugheslocal uInt longest_match(s, cur_match) 12989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 12999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos cur_match; /* current match */ 13009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 13019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *scan = s->window + s->strstart; /* current string */ 13029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *match; /* matched string */ 13039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register int len; /* length of current match */ 13049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH; 13059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. 13079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * It is easy to get rid of this optimization if necessary. 13089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); 13109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); 13129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(cur_match < s->strstart, "no future"); 13149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match = s->window + cur_match; 13169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Return failure if the match length is less than 2: 13189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1; 13209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The check at best_len-1 can be removed because it will be made 13229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * again later. (This heuristic is not always a win.) 13239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * It is not necessary to compare scan[2] and match[2] since they 13249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * are always equal when the other bytes match, given that 13259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the hash keys are equal and that HASH_BITS >= 8. 13269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan += 2, match += 2; 13289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(*scan == *match, "match[2]?"); 13299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* We check for insufficient lookahead only every 8th comparison; 13319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the 256th check will be made at strstart+258. 13329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 13349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (*++scan == *++match && *++scan == *++match && 13359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 13369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 13379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 13389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan < strend); 13399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 13419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project len = MAX_MATCH - (int)(strend - scan); 13439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len < MIN_MATCH) return MIN_MATCH - 1; 13459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_start = cur_match; 13479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead; 13489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 13499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1350381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes#endif /* FASTEST */ 1351381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 13529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef DEBUG 13539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 13549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Check that the match at match_start is indeed a match. 13559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void check_match(s, start, match, length) 13579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 13589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos start, match; 13599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int length; 13609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 13619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* check that the match is indeed a match */ 13629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (zmemcmp(s->window + match, 13639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->window + start, length) != EQUAL) { 13649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fprintf(stderr, " start %u, match %u, length %d\n", 13659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project start, match, length); 13669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 13679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fprintf(stderr, "%c%c", s->window[match++], s->window[start++]); 13689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--length != 0); 13699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_error("invalid match"); 13709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 13719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (z_verbose > 1) { 13729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fprintf(stderr,"\\[%d,%d]", start-match, length); 13739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { putc(s->window[start++], stderr); } while (--length != 0); 13749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 13759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 13769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 13779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project# define check_match(s, start, match, length) 13789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* DEBUG */ 13799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 13819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Fill the window when the lookahead becomes insufficient. 13829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Updates strstart and lookahead. 13839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 13849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: lookahead < MIN_LOOKAHEAD 13859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD 13869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * At least one byte has been read, or avail_in == 0; reads are 13879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * performed for at least two bytes (required for the zip translate_eol 13889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * option -- not supported here). 13899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void fill_window(s) 13919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 13929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 13939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register unsigned n, m; 13949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Posf *p; 13959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project unsigned more; /* Amount of free space at the end of the window. */ 13969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt wsize = s->w_size; 13979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1398ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead"); 1399ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes 14009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 14019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart); 14029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Deal with !@#$% 64K limit: */ 14049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (sizeof(int) <= 2) { 14059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (more == 0 && s->strstart == 0 && s->lookahead == 0) { 14069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project more = wsize; 14079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else if (more == (unsigned)(-1)) { 14099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Very unlikely, but possible on 16 bit machine if 14109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart == 0 && lookahead == 1 (input done a byte at time) 14119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project more--; 14139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If the window is almost full and there is insufficient lookahead, 14179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * move the upper half to the lower one to make room in the upper half. 14189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart >= wsize+MAX_DIST(s)) { 14209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(s->window, s->window+wsize, (unsigned)wsize); 14229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_start -= wsize; 14239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart -= wsize; /* we now have strstart >= MAX_DIST */ 14249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->block_start -= (long) wsize; 14259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Slide the hash table (could be avoided with 32 bit values 14279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project at the expense of memory usage). We slide even when level == 0 14289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project to keep the hash table consistent if we switch back to level > 0 14299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project later. (Using level 0 permanently is not an optimal usage of 14309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zlib, so we don't care about this pathological case.) 14319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project n = s->hash_size; 14339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project p = &s->head[n]; 14349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 14359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project m = *--p; 14369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *p = (Pos)(m >= wsize ? m-wsize : NIL); 14379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--n); 14389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project n = wsize; 14409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 14419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project p = &s->prev[n]; 14429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 14439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project m = *--p; 14449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *p = (Pos)(m >= wsize ? m-wsize : NIL); 14459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If n is not on any hash chain, prev[n] is garbage but 14469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * its value will never be used. 14479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--n); 14499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 14509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project more += wsize; 14519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 1452ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->strm->avail_in == 0) break; 14539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If there was no sliding: 14559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 && 14569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * more == window_size - lookahead - strstart 14579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1) 14589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * => more >= window_size - 2*WSIZE + 2 14599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * In the BIG_MEM or MMAP case (not yet supported), 14609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * window_size == input_size + MIN_LOOKAHEAD && 14619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD. 14629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Otherwise, window_size == 2*WSIZE so more >= 2. 14639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * If there was sliding, more >= WSIZE. So in all cases, more >= 2. 14649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(more >= 2, "more < 2"); 14669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more); 14689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead += n; 14699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Initialize the hash value now that we have some input: */ 1471ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->lookahead + s->insert >= MIN_MATCH) { 1472ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes uInt str = s->strstart - s->insert; 1473ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->ins_h = s->window[str]; 1474ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes UPDATE_HASH(s, s->ins_h, s->window[str + 1]); 14759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#if MIN_MATCH != 3 14769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Call UPDATE_HASH() MIN_MATCH-3 more times 14779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1478ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes while (s->insert) { 1479ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); 1480ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#ifndef FASTEST 1481ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->prev[str & s->w_mask] = s->head[s->ins_h]; 1482ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes#endif 1483ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->head[s->ins_h] = (Pos)str; 1484ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes str++; 1485ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert--; 1486ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->lookahead + s->insert < MIN_MATCH) 1487ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes break; 1488ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } 14899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage, 14919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * but this is not important since only literal bytes will be emitted. 14929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0); 1495381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 1496381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* If the WIN_INIT bytes after the end of the current data have never been 1497381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * written, then zero those bytes in order to avoid memory check reports of 1498381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * the use of uninitialized (or uninitialised as Julian writes) bytes by 1499381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * the longest match routines. Update the high water mark for the next 1500381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * time through here. WIN_INIT is set to MAX_MATCH since the longest match 1501381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead. 1502381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes */ 1503381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->high_water < s->window_size) { 1504381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes ulg curr = s->strstart + (ulg)(s->lookahead); 1505381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes ulg init; 1506381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 1507381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->high_water < curr) { 1508381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* Previous high water mark below current data -- zero WIN_INIT 1509381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * bytes or up to end of window, whichever is less. 1510381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes */ 1511381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes init = s->window_size - curr; 1512381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (init > WIN_INIT) 1513381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes init = WIN_INIT; 1514381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes zmemzero(s->window + curr, (unsigned)init); 1515381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->high_water = curr + init; 1516381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 1517381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes else if (s->high_water < (ulg)curr + WIN_INIT) { 1518381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* High water mark at or above current data, but below current data 1519381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up 1520381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * to end of window, whichever is less. 1521381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes */ 1522381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes init = (ulg)curr + WIN_INIT - s->high_water; 1523381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (init > s->window_size - s->high_water) 1524381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes init = s->window_size - s->high_water; 1525381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes zmemzero(s->window + s->high_water, (unsigned)init); 1526381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->high_water += init; 1527381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 1528381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 1529ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes 1530ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD, 1531ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes "not enough room for search"); 15329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 15339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 15359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Flush the current block, with given end-of-file flag. 15369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: strstart is set to the end of the current match. 15379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1538381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes#define FLUSH_BLOCK_ONLY(s, last) { \ 15399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_flush_block(s, (s->block_start >= 0L ? \ 15409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (charf *)&s->window[(unsigned)s->block_start] : \ 15419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (charf *)Z_NULL), \ 15429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (ulg)((long)s->strstart - s->block_start), \ 1543381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes (last)); \ 15449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->block_start = s->strstart; \ 15459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(s->strm); \ 15469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracev((stderr,"[FLUSH]")); \ 15479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 15489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Same but force premature exit if necessary. */ 1550381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes#define FLUSH_BLOCK(s, last) { \ 1551381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes FLUSH_BLOCK_ONLY(s, last); \ 1552381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \ 15539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 15549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 15569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Copy without compression as much as possible from the input stream, return 15579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the current block state. 15589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * This function does not insert new strings in the dictionary since 15599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * uncompressible data is probably not useful. This function is used 15609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * only for the level=0 compression option. 15619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * NOTE: this function should be optimized to avoid extra copying from 15629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * window to pending_buf. 15639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_stored(s, flush) 15659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 15669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 15679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 15689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Stored blocks are limited to 0xffff bytes, pending_buf is limited 15699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to pending_buf_size, and each stored block has a 5 byte header: 15709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ulg max_block_size = 0xffff; 15729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ulg max_start; 15739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (max_block_size > s->pending_buf_size - 5) { 15759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project max_block_size = s->pending_buf_size - 5; 15769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 15779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Copy as much as possible from input to output: */ 15799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project for (;;) { 15809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Fill the window as much as possible: */ 15819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead <= 1) { 15829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(s->strstart < s->w_size+MAX_DIST(s) || 15849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->block_start >= (long)s->w_size, "slide too late"); 15859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fill_window(s); 15879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0 && flush == Z_NO_FLUSH) return need_more; 15889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 15909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 15919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(s->block_start >= 0L, "block gone"); 15929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart += s->lookahead; 15949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead = 0; 15959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Emit a stored block if pending_buf will be full: */ 15979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project max_start = s->block_start + max_block_size; 15989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart == 0 || (ulg)s->strstart >= max_start) { 15999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* strstart == 0 is possible when wraparound on 16-bit machine */ 16009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead = (uInt)(s->strstart - max_start); 16019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart = (uInt)max_start; 16029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK(s, 0); 16039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Flush if we may have to slide, otherwise block_start may become 16059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * negative and the data will be gone: 16069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart - (uInt)s->block_start >= MAX_DIST(s)) { 16089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK(s, 0); 16099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 1611ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert = 0; 1612ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (flush == Z_FINISH) { 1613ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 1); 1614ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return finish_done; 1615ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } 1616ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if ((long)s->strstart > s->block_start) 1617ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 0); 1618ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return block_done; 16199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 16209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 16229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Compress as much as possible from the input stream, return the current 16239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * block state. 16249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * This function does not perform lazy evaluation of matches and inserts 16259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * new strings in the dictionary only for unmatched strings or for short 16269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * matches. It is used only for the fast compression options. 16279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_fast(s, flush) 16299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 16309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 16319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 1632381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes IPos hash_head; /* head of the hash chain */ 16339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int bflush; /* set if current block must be flushed */ 16349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project for (;;) { 16369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Make sure that we always have enough lookahead, except 16379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 16389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * for the next match, plus MIN_MATCH bytes to insert the 16399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * string following the next match. 16409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD) { 16429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fill_window(s); 16439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { 16449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return need_more; 16459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 16479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Insert the string window[strstart .. strstart+2] in the 16509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * dictionary, and set hash_head to the head of the hash chain: 16519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1652381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes hash_head = NIL; 16539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead >= MIN_MATCH) { 16549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 16559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Find the longest match, discarding those <= prev_length. 16589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * At this point we have always match_length < MIN_MATCH 16599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) { 16619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* To simplify the code, we prevent matches with the string 16629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of window index 0 (in particular we have to avoid a match 16639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of the string with itself at the start of the input file). 16649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1665381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->match_length = longest_match (s, hash_head); 1666381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* longest_match() sets match_start */ 16679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->match_length >= MIN_MATCH) { 16699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project check_match(s, s->strstart, s->match_start, s->match_length); 16709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_dist(s, s->strstart - s->match_start, 16729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length - MIN_MATCH, bflush); 16739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead -= s->match_length; 16759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Insert new strings in the hash table only if the match length 16779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * is not too large. This saves time but degrades compression. 16789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 16809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->match_length <= s->max_insert_length && 16819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead >= MIN_MATCH) { 16829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length--; /* string at strstart already in table */ 16839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 16849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 16859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 16869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* strstart never exceeds WSIZE-MAX_MATCH, so there are 16879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * always MIN_MATCH bytes ahead. 16889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--s->match_length != 0); 16909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 16919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else 16929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 16939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 16949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart += s->match_length; 16959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = 0; 16969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->ins_h = s->window[s->strstart]; 16979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]); 16989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#if MIN_MATCH != 3 16999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Call UPDATE_HASH() MIN_MATCH-3 more times 17009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 17019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not 17029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * matter since it will be recomputed at next deflate call. 17039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 17049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else { 17069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* No match, output a literal byte */ 17079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart])); 17089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_lit (s, s->window[s->strstart], bflush); 17099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead--; 17109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 17119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 17139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 1714ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1; 1715ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (flush == Z_FINISH) { 1716ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 1); 1717ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return finish_done; 1718ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } 1719ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->last_lit) 1720ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 0); 1721ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return block_done; 17229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 17239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 17259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 17269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Same as above, but achieves better compression. We use a lazy 17279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * evaluation for matches: a match is finally adopted only if there is 17289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * no better match at the next window position. 17299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 17309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_slow(s, flush) 17319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 17329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 17339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 1734381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes IPos hash_head; /* head of hash chain */ 17359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int bflush; /* set if current block must be flushed */ 17369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Process the input block. */ 17389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project for (;;) { 17399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Make sure that we always have enough lookahead, except 17409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 17419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * for the next match, plus MIN_MATCH bytes to insert the 17429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * string following the next match. 17439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 17449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD) { 17459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fill_window(s); 17469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { 17479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return need_more; 17489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 17509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Insert the string window[strstart .. strstart+2] in the 17539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * dictionary, and set hash_head to the head of the hash chain: 17549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1755381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes hash_head = NIL; 17569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead >= MIN_MATCH) { 17579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 17589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Find the longest match, discarding those <= prev_length. 17619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 17629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->prev_length = s->match_length, s->prev_match = s->match_start; 17639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = MIN_MATCH-1; 17649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (hash_head != NIL && s->prev_length < s->max_lazy_match && 17669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart - hash_head <= MAX_DIST(s)) { 17679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* To simplify the code, we prevent matches with the string 17689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of window index 0 (in particular we have to avoid a match 17699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of the string with itself at the start of the input file). 17709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1771381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->match_length = longest_match (s, hash_head); 1772381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* longest_match() sets match_start */ 17739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->match_length <= 5 && (s->strategy == Z_FILTERED 17759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#if TOO_FAR <= 32767 17769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project || (s->match_length == MIN_MATCH && 17779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart - s->match_start > TOO_FAR) 17789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 17799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project )) { 17809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If prev_match is also MIN_MATCH, match_start is garbage 17829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * but we will ignore the current match anyway. 17839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 17849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = MIN_MATCH-1; 17859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If there was a match at the previous step and the current 17889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * match is not better, output the previous match: 17899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 17909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) { 17919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt max_insert = s->strstart + s->lookahead - MIN_MATCH; 17929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Do not insert strings in hash table beyond this. */ 17939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project check_match(s, s->strstart-1, s->prev_match, s->prev_length); 17959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_dist(s, s->strstart -1 - s->prev_match, 17979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->prev_length - MIN_MATCH, bflush); 17989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Insert in hash table all strings up to the end of the match. 18009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart-1 and strstart are already inserted. If there is not 18019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * enough lookahead, the last two strings are not inserted in 18029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the hash table. 18039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 18049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead -= s->prev_length-1; 18059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->prev_length -= 2; 18069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 18079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (++s->strstart <= max_insert) { 18089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 18099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 18109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--s->prev_length != 0); 18119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_available = 0; 18129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = MIN_MATCH-1; 18139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 18149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 18159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 18169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 18179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else if (s->match_available) { 18189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If there was no match at the previous position, output a 18199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * single literal. If there was a match but the current match 18209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * is longer, truncate the previous match to a single literal. 18219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 18229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart-1])); 18239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_lit(s, s->window[s->strstart-1], bflush); 18249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bflush) { 18259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK_ONLY(s, 0); 18269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 18279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 18289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead--; 18299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strm->avail_out == 0) return need_more; 18309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else { 18319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* There is no previous match to compare with, wait for 18329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the next step to decide. 18339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 18349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_available = 1; 18359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 18369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead--; 18379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 18389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 18399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert (flush != Z_NO_FLUSH, "no flush?"); 18409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->match_available) { 18419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart-1])); 18429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_lit(s, s->window[s->strstart-1], bflush); 18439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_available = 0; 18449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 1845ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1; 1846ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (flush == Z_FINISH) { 1847ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 1); 1848ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return finish_done; 1849ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } 1850ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->last_lit) 1851ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 0); 1852ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return block_done; 18539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 18549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* FASTEST */ 18559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 18569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 18579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For Z_RLE, simply look for runs of bytes, generate matches only of distance 18589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * one. Do not maintain a hash table. (It will be regenerated if this run of 18599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * deflate switches away from Z_RLE.) 18609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 18619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_rle(s, flush) 18629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 18639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 18649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 1865381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes int bflush; /* set if current block must be flushed */ 1866381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes uInt prev; /* byte at distance one to match */ 1867381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes Bytef *scan, *strend; /* scan goes up to strend for length of run */ 18689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 18699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project for (;;) { 18709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Make sure that we always have enough lookahead, except 18719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 1872ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes * for the longest run, plus one for the unrolled loop. 18739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1874ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->lookahead <= MAX_MATCH) { 18759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fill_window(s); 1876ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->lookahead <= MAX_MATCH && flush == Z_NO_FLUSH) { 18779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return need_more; 18789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 18799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 18809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 18819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 18829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* See how many times the previous byte repeats */ 1883381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->match_length = 0; 1884381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->lookahead >= MIN_MATCH && s->strstart > 0) { 18859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan = s->window + s->strstart - 1; 1886381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes prev = *scan; 1887381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (prev == *++scan && prev == *++scan && prev == *++scan) { 1888381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes strend = s->window + s->strstart + MAX_MATCH; 1889381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes do { 1890381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } while (prev == *++scan && prev == *++scan && 1891381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes prev == *++scan && prev == *++scan && 1892381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes prev == *++scan && prev == *++scan && 1893381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes prev == *++scan && prev == *++scan && 1894381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes scan < strend); 1895381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->match_length = MAX_MATCH - (int)(strend - scan); 1896381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->match_length > s->lookahead) 1897381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->match_length = s->lookahead; 1898381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 1899ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan"); 19009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 19019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 19029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Emit match if have run of MIN_MATCH or longer, else emit literal */ 1903381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->match_length >= MIN_MATCH) { 1904381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes check_match(s, s->strstart, s->strstart - 1, s->match_length); 1905381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 1906381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes _tr_tally_dist(s, 1, s->match_length - MIN_MATCH, bflush); 1907381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 1908381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->lookahead -= s->match_length; 1909381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->strstart += s->match_length; 1910381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->match_length = 0; 19119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else { 19129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* No match, output a literal byte */ 19139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart])); 19149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_lit (s, s->window[s->strstart], bflush); 19159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead--; 19169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 19179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 19189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 19199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 1920ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert = 0; 1921ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (flush == Z_FINISH) { 1922ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 1); 1923ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return finish_done; 1924ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } 1925ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->last_lit) 1926ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 0); 1927ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return block_done; 19289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 1929381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 1930381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes/* =========================================================================== 1931381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table. 1932381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes * (It will be regenerated if this run of deflate switches away from Huffman.) 1933381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes */ 1934381716e9396b55b1adb8235b020c37344f60ab07Elliott Hugheslocal block_state deflate_huff(s, flush) 1935381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes deflate_state *s; 1936381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes int flush; 1937381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes{ 1938381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes int bflush; /* set if current block must be flushed */ 1939381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 1940381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes for (;;) { 1941381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* Make sure that we have a literal to write. */ 1942381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->lookahead == 0) { 1943381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes fill_window(s); 1944381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (s->lookahead == 0) { 1945381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (flush == Z_NO_FLUSH) 1946381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes return need_more; 1947381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes break; /* flush the current block */ 1948381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 1949381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 1950381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 1951381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes /* Output a literal byte */ 1952381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->match_length = 0; 1953381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes Tracevv((stderr,"%c", s->window[s->strstart])); 1954381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes _tr_tally_lit (s, s->window[s->strstart], bflush); 1955381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->lookahead--; 1956381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes s->strstart++; 1957381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes if (bflush) FLUSH_BLOCK(s, 0); 1958381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes } 1959ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes s->insert = 0; 1960ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (flush == Z_FINISH) { 1961ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 1); 1962ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return finish_done; 1963ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes } 1964ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes if (s->last_lit) 1965ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes FLUSH_BLOCK(s, 0); 1966ee9e11d0d4e3361533860bf04896abb86a291bfbElliott Hughes return block_done; 1967381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes} 1968