18b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* deflate.c -- compress data using the deflation algorithm 217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler 38b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For conditions of distribution and use, see copyright notice in zlib.h 48b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 58b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 68b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 78b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * ALGORITHM 88b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 98b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * The "deflation" process depends on being able to identify portions 108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of the input text which are identical to earlier input (within a 118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * sliding window trailing behind the input currently being processed). 128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * The most straightforward technique turns out to be the fastest for 148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * most input files: try all possible matches and select the longest. 158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * The key feature of this algorithm is that insertions into the string 168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * dictionary are very simple and thus fast, and deletions are avoided 178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * completely. Insertions are performed at each input character, whereas 188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * string matches are performed only when the previous match ends. So it 198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * is preferable to spend more time in matches to allow very fast string 208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * insertions and avoid deletions. The matching algorithm for small 218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strings is inspired from that of Rabin & Karp. A brute force approach 228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * is used to find longer strings when a small match has been found. 238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * A similar algorithm is used in comic (by Jan-Mark Wams) and freeze 248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (by Leonid Broukhis). 258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * A previous version of this file used a more sophisticated algorithm 268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (by Fiala and Greene) which is guaranteed to run in linear amortized 278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * time, but has a larger average cost, uses more memory and is patented. 288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * However the F&G algorithm may be faster for some highly redundant 298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * files if the parameter max_chain_length (described below) is too large. 308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * ACKNOWLEDGEMENTS 328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * The idea of lazy evaluation of matches is due to Jan-Mark Wams, and 348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * I found it in 'freeze' written by Leonid Broukhis. 358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Thanks to many people for bug reports and testing. 368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * REFERENCES 388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Deutsch, L.P.,"DEFLATE Compressed Data Format Specification". 4017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * Available in http://tools.ietf.org/html/rfc1951 418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * A description of the Rabin and Karp algorithm is given in the book 438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * "Algorithms" by R. Sedgewick, Addison-Wesley, p252. 448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Fiala,E.R., and Greene,D.H. 468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595 478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* @(#) $Id$ */ 518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#include "deflate.h" 538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectconst char deflate_copyright[] = 5517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner " deflate 1.2.8 Copyright 1995-2013 Jean-loup Gailly and Mark Adler "; 568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project If you use the zlib library in a product, an acknowledgment is welcome 588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project in the documentation of your product. If for some reason you cannot 598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project include such an acknowledgment, I would appreciate that you keep this 608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project copyright string in the executable of your product. 618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Function prototypes. 658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projecttypedef enum { 678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project need_more, /* block not completed, need more input or more output */ 688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project block_done, /* block flush performed */ 698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project finish_started, /* finish started, need only more output at next deflate */ 708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project finish_done /* finish done, accept no more input or output */ 718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} block_state; 728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projecttypedef block_state (*compress_func) OF((deflate_state *s, int flush)); 748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Compression function. Returns the block state after the call. */ 758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void fill_window OF((deflate_state *s)); 778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_stored OF((deflate_state *s, int flush)); 788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_fast OF((deflate_state *s, int flush)); 798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_slow OF((deflate_state *s, int flush)); 818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 8217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turnerlocal block_state deflate_rle OF((deflate_state *s, int flush)); 8317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turnerlocal block_state deflate_huff OF((deflate_state *s, int flush)); 848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void lm_init OF((deflate_state *s)); 858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void putShortMSB OF((deflate_state *s, uInt b)); 868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void flush_pending OF((z_streamp strm)); 878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal int read_buf OF((z_streamp strm, Bytef *buf, unsigned size)); 888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef ASMV 898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project void match_init OF((void)); /* asm code initialization */ 908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt longest_match OF((deflate_state *s, IPos cur_match)); 918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal uInt longest_match OF((deflate_state *s, IPos cur_match)); 938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef DEBUG 968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void check_match OF((deflate_state *s, IPos start, IPos match, 978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int length)); 988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 1018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Local data 1028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define NIL 0 1058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Tail of hash chains */ 1068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef TOO_FAR 1088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project# define TOO_FAR 4096 1098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */ 1118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Values for max_lazy_match, good_match and max_chain_length, depending on 1138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the desired pack level (0..9). The values given below have been tuned to 1148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * exclude worst case performance for pathological files. Better values may be 1158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * found for specific files. 1168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projecttypedef struct config_s { 1188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ush good_length; /* reduce lazy search above this match length */ 1198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ush max_lazy; /* do not perform lazy search above this match length */ 1208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ush nice_length; /* quit search above this match length */ 1218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ush max_chain; 1228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project compress_func func; 1238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} config; 1248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef FASTEST 1268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal const config configuration_table[2] = { 1278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* good lazy nice chain */ 1288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ 1298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 1 */ {4, 4, 8, 4, deflate_fast}}; /* max speed, no lazy matches */ 1308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 1318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal const config configuration_table[10] = { 1328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* good lazy nice chain */ 1338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ 1348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 1 */ {4, 4, 8, 4, deflate_fast}, /* max speed, no lazy matches */ 1358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 2 */ {4, 5, 16, 8, deflate_fast}, 1368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 3 */ {4, 6, 32, 32, deflate_fast}, 1378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 4 */ {4, 4, 16, 16, deflate_slow}, /* lazy matches */ 1398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 5 */ {8, 16, 32, 32, deflate_slow}, 1408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 6 */ {8, 16, 128, 128, deflate_slow}, 1418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 7 */ {8, 32, 128, 256, deflate_slow}, 1428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 8 */ {32, 128, 258, 1024, deflate_slow}, 1438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 9 */ {32, 258, 258, 4096, deflate_slow}}; /* max compression */ 1448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4 1478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For deflate_fast() (levels <= 3) good is ignored and lazy has a different 1488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * meaning. 1498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define EQUAL 0 1528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* result of memcmp for equal strings */ 1538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef NO_DUMMY_DECL 1558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectstruct static_tree_desc_s {int dummy;}; /* for buggy compilers */ 1568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner/* rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH */ 15917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#define RANK(f) (((f) << 1) - ((f) > 4 ? 9 : 0)) 16017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 1618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 1628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Update a hash value with the given input byte 1638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: all calls to to UPDATE_HASH are made with consecutive 1648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * input characters, so that a running hash key can be computed from the 1658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * previous key instead of complete recalculation each time. 1668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask) 1688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 1718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Insert string str in the dictionary and set match_head to the previous head 1728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of the hash chain (the most recent string with same hash key). Return 1738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the previous length of the hash chain. 1748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * If this file is compiled with -DFASTEST, the compression level is forced 1758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to 1, and no hash chains are maintained. 1768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: all calls to to INSERT_STRING are made with consecutive 1778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * input characters and the first MIN_MATCH bytes of str are valid 1788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (except for the last MIN_MATCH-1 bytes of the input file). 1798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef FASTEST 1818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define INSERT_STRING(s, str, match_head) \ 1828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ 1838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match_head = s->head[s->ins_h], \ 1848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->head[s->ins_h] = (Pos)(str)) 1858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 1868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define INSERT_STRING(s, str, match_head) \ 1878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ 1888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \ 1898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->head[s->ins_h] = (Pos)(str)) 1908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 1938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Initialize the hash table (avoiding 64K overflow for 16 bit systems). 1948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * prev[] will be initialized on the fly. 1958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define CLEAR_HASH(s) \ 1978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->head[s->hash_size-1] = NIL; \ 1988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head)); 1998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 2018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateInit_(strm, level, version, stream_size) 2028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 2038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int level; 2048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project const char *version; 2058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int stream_size; 2068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 2078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, 2088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Z_DEFAULT_STRATEGY, version, stream_size); 2098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* To do: ignore strm->next_in if we use it as window */ 2108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 2118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 2138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy, 2148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project version, stream_size) 2158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 2168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int level; 2178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int method; 2188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int windowBits; 2198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int memLevel; 2208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int strategy; 2218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project const char *version; 2228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int stream_size; 2238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 2248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 2258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int wrap = 1; 2268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project static const char my_version[] = ZLIB_VERSION; 2278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ushf *overlay; 2298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* We overlay pending_buf and d_buf+l_buf. This works since the average 2308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * output size for (length,distance) codes is <= 24 bits. 2318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 2328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (version == Z_NULL || version[0] != my_version[0] || 2348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project stream_size != sizeof(z_stream)) { 2358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_VERSION_ERROR; 2368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL) return Z_STREAM_ERROR; 2388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->msg = Z_NULL; 2408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->zalloc == (alloc_func)0) { 24117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#ifdef Z_SOLO 24217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return Z_STREAM_ERROR; 24317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#else 2448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->zalloc = zcalloc; 2458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->opaque = (voidpf)0; 24617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#endif 2478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 24817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (strm->zfree == (free_func)0) 24917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#ifdef Z_SOLO 25017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return Z_STREAM_ERROR; 25117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#else 25217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->zfree = zcfree; 25317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#endif 2548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef FASTEST 2568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level != 0) level = 1; 2578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 2588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level == Z_DEFAULT_COMPRESSION) level = 6; 2598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 2608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (windowBits < 0) { /* suppress zlib wrapper */ 2628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project wrap = 0; 2638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project windowBits = -windowBits; 2648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 2668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (windowBits > 15) { 2678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project wrap = 2; /* write gzip wrapper instead */ 2688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project windowBits -= 16; 2698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 2718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED || 2728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project windowBits < 8 || windowBits > 15 || level < 0 || level > 9 || 2738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strategy < 0 || strategy > Z_FIXED) { 2748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 2758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (windowBits == 8) windowBits = 9; /* until 256-byte window bug fixed */ 2778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state)); 2788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s == Z_NULL) return Z_MEM_ERROR; 2798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state = (struct internal_state FAR *)s; 2808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strm = strm; 2818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->wrap = wrap; 2838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzhead = Z_NULL; 2848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->w_bits = windowBits; 2858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->w_size = 1 << s->w_bits; 2868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->w_mask = s->w_size - 1; 2878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->hash_bits = memLevel + 7; 2898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->hash_size = 1 << s->hash_bits; 2908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->hash_mask = s->hash_size - 1; 2918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH); 2928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte)); 2948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos)); 2958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos)); 2968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 29717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->high_water = 0; /* nothing written to s->window yet */ 29817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 2998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */ 3008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2); 3028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending_buf = (uchf *) overlay; 3038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L); 3048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL || 3068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending_buf == Z_NULL) { 3078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = FINISH_STATE; 30817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->msg = ERR_MSG(Z_MEM_ERROR); 3098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflateEnd (strm); 3108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_MEM_ERROR; 3118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->d_buf = overlay + s->lit_bufsize/sizeof(ush); 3138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize; 3148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->level = level; 3168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strategy = strategy; 3178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->method = (Byte)method; 3188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return deflateReset(strm); 3208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 3218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 3238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateSetDictionary (strm, dictionary, dictLength) 3248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 3258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project const Bytef *dictionary; 3268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt dictLength; 3278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 3288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 32917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner uInt str, n; 33017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner int wrap; 33117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner unsigned avail; 33217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner z_const unsigned char *next; 3338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 33417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (strm == Z_NULL || strm->state == Z_NULL || dictionary == Z_NULL) 3358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 3368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 33717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner wrap = s->wrap; 33817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (wrap == 2 || (wrap == 1 && s->status != INIT_STATE) || s->lookahead) 33917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return Z_STREAM_ERROR; 3408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 34117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* when using zlib wrappers, compute Adler-32 for provided dictionary */ 34217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (wrap == 1) 34317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->adler = adler32(strm->adler, dictionary, dictLength); 34417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->wrap = 0; /* avoid computing Adler-32 in read_buf */ 34517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 34617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* if dictionary would fill window, just replace the history */ 34717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (dictLength >= s->w_size) { 34817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (wrap == 0) { /* already empty otherwise */ 34917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner CLEAR_HASH(s); 35017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->strstart = 0; 35117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->block_start = 0L; 35217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert = 0; 35317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 35417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner dictionary += dictLength - s->w_size; /* use the tail */ 35517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner dictLength = s->w_size; 3568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 35817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* insert dictionary into window and hash */ 35917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner avail = strm->avail_in; 36017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner next = strm->next_in; 36117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->avail_in = dictLength; 36217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->next_in = (z_const Bytef *)dictionary; 36317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner fill_window(s); 36417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner while (s->lookahead >= MIN_MATCH) { 36517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner str = s->strstart; 36617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner n = s->lookahead - (MIN_MATCH-1); 36717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner do { 36817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); 36917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#ifndef FASTEST 37017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->prev[str & s->w_mask] = s->head[s->ins_h]; 37117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#endif 37217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->head[s->ins_h] = (Pos)str; 37317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner str++; 37417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } while (--n); 37517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->strstart = str; 37617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->lookahead = MIN_MATCH-1; 37717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner fill_window(s); 3788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 37917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->strstart += s->lookahead; 38017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->block_start = (long)s->strstart; 38117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert = s->lookahead; 38217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->lookahead = 0; 38317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->match_length = s->prev_length = MIN_MATCH-1; 38417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->match_available = 0; 38517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->next_in = next; 38617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->avail_in = avail; 38717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->wrap = wrap; 3888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 3898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 3908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 39217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turnerint ZEXPORT deflateResetKeep (strm) 3938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 3948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 3958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 3968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || 3988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0) { 3998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 4008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->total_in = strm->total_out = 0; 4038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */ 4048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->data_type = Z_UNKNOWN; 4058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = (deflate_state *)strm->state; 4078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending = 0; 4088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending_out = s->pending_buf; 4098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap < 0) { 4118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->wrap = -s->wrap; /* was made negative by deflate(..., Z_FINISH); */ 4128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = s->wrap ? INIT_STATE : BUSY_STATE; 4148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = 4158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 4168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->wrap == 2 ? crc32(0L, Z_NULL, 0) : 4178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 4188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project adler32(0L, Z_NULL, 0); 4198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = Z_NO_FLUSH; 4208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_init(s); 4228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 4248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 4258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 42717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turnerint ZEXPORT deflateReset (strm) 42817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner z_streamp strm; 42917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner{ 43017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner int ret; 43117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 43217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner ret = deflateResetKeep(strm); 43317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (ret == Z_OK) 43417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner lm_init(strm->state); 43517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return ret; 43617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner} 43717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 43817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner/* ========================================================================= */ 4398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateSetHeader (strm, head) 4408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 4418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project gz_headerp head; 4428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 4438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 4448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->state->wrap != 2) return Z_STREAM_ERROR; 4458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state->gzhead = head; 4468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 4478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 4488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 45017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turnerint ZEXPORT deflatePending (strm, pending, bits) 45117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner unsigned *pending; 45217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner int *bits; 45317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner z_streamp strm; 45417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner{ 45517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 45617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (pending != Z_NULL) 45717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner *pending = strm->state->pending; 45817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (bits != Z_NULL) 45917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner *bits = strm->state->bi_valid; 46017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return Z_OK; 46117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner} 46217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 46317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner/* ========================================================================= */ 4648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflatePrime (strm, bits, value) 4658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 4668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int bits; 4678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int value; 4688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 46917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner deflate_state *s; 47017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner int put; 47117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 4728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 47317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s = strm->state; 47417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3)) 47517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return Z_BUF_ERROR; 47617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner do { 47717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner put = Buf_size - s->bi_valid; 47817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (put > bits) 47917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner put = bits; 48017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->bi_buf |= (ush)((value & ((1 << put) - 1)) << s->bi_valid); 48117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->bi_valid += put; 48217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner _tr_flush_bits(s); 48317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner value >>= put; 48417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner bits -= put; 48517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } while (bits); 4868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 4878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 4888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 4908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateParams(strm, level, strategy) 4918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 4928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int level; 4938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int strategy; 4948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 4958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 4968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project compress_func func; 4978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int err = Z_OK; 4988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 5008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 5018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef FASTEST 5038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level != 0) level = 1; 5048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 5058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level == Z_DEFAULT_COMPRESSION) level = 6; 5068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 5078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) { 5088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 5098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project func = configuration_table[s->level].func; 5118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 51217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if ((strategy != s->strategy || func != configuration_table[level].func) && 51317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->total_in != 0) { 5148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Flush the last buffer: */ 51517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner err = deflate(strm, Z_BLOCK); 51617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (err == Z_BUF_ERROR && s->pending == 0) 51717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner err = Z_OK; 5188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->level != level) { 5208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->level = level; 5218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_lazy_match = configuration_table[level].max_lazy; 5228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->good_match = configuration_table[level].good_length; 5238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->nice_match = configuration_table[level].nice_length; 5248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_chain_length = configuration_table[level].max_chain; 5258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strategy = strategy; 5278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return err; 5288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 5298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 5318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain) 5328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 5338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int good_length; 5348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int max_lazy; 5358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int nice_length; 5368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int max_chain; 5378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 5388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 5398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 5418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 5428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->good_match = good_length; 5438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_lazy_match = max_lazy; 5448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->nice_match = nice_length; 5458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_chain_length = max_chain; 5468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 5478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 5488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= 5508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For the default windowBits of 15 and memLevel of 8, this function returns 5518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * a close to exact, as well as small, upper bound on the compressed size. 5528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * They are coded as constants here for a reason--if the #define's are 5538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * changed, then this function needs to be changed as well. The return 5548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * value for 15 and 8 only works for those exact settings. 5558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 5568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For any setting other than those defaults for windowBits and memLevel, 5578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the value returned is a conservative worst case for the maximum expansion 5588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * resulting from using fixed blocks instead of stored blocks, which deflate 5598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * can emit on compressed data for some combinations of the parameters. 5608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 56117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * This function could be more sophisticated to provide closer upper bounds for 56217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * every combination of windowBits and memLevel. But even the conservative 56317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * upper bound of about 14% expansion does not seem onerous for output buffer 56417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * allocation. 5658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 5668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source ProjectuLong ZEXPORT deflateBound(strm, sourceLen) 5678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 5688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uLong sourceLen; 5698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 5708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 57117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner uLong complen, wraplen; 57217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner Bytef *str; 5738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 57417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* conservative upper bound for compressed data */ 57517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner complen = sourceLen + 57617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5; 5778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 57817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* if can't get parameters, return conservative bound plus zlib wrapper */ 5798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) 58017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return complen + 6; 5818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 58217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* compute wrapper length */ 5838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 58417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner switch (s->wrap) { 58517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner case 0: /* raw deflate */ 58617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner wraplen = 0; 58717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner break; 58817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner case 1: /* zlib wrapper */ 58917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner wraplen = 6 + (s->strstart ? 4 : 0); 59017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner break; 59117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner case 2: /* gzip wrapper */ 59217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner wraplen = 18; 59317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->gzhead != Z_NULL) { /* user-supplied gzip header */ 59417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->gzhead->extra != Z_NULL) 59517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner wraplen += 2 + s->gzhead->extra_len; 59617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner str = s->gzhead->name; 59717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (str != Z_NULL) 59817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner do { 59917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner wraplen++; 60017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } while (*str++); 60117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner str = s->gzhead->comment; 60217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (str != Z_NULL) 60317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner do { 60417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner wraplen++; 60517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } while (*str++); 60617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->gzhead->hcrc) 60717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner wraplen += 2; 60817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 60917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner break; 61017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner default: /* for compiler happiness */ 61117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner wraplen = 6; 61217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 61317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 61417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* if not default parameters, return conservative bound */ 6158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->w_bits != 15 || s->hash_bits != 8 + 7) 61617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return complen + wraplen; 6178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* default settings: return tight bound for that case */ 61917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + 62017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner (sourceLen >> 25) + 13 - 6 + wraplen; 6218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 6228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= 6248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Put a short in the pending buffer. The 16-bit value is put in MSB order. 6258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: the stream state is correct and there is enough room in 6268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * pending_buf. 6278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 6288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void putShortMSB (s, b) 6298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 6308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt b; 6318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 6328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(b >> 8)); 6338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(b & 0xff)); 6348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 6358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= 6378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Flush as much pending output as possible. All deflate() output goes 6388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * through this function so some applications may wish to modify it 6398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to avoid allocating a large strm->next_out buffer and copying into it. 6408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (See also read_buf()). 6418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 6428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void flush_pending(strm) 6438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 6448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 64517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner unsigned len; 64617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner deflate_state *s = strm->state; 6478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 64817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner _tr_flush_bits(s); 64917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner len = s->pending; 6508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len > strm->avail_out) len = strm->avail_out; 6518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len == 0) return; 6528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 65317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner zmemcpy(strm->next_out, s->pending_out, len); 6548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->next_out += len; 65517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->pending_out += len; 6568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->total_out += len; 6578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->avail_out -= len; 65817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->pending -= len; 65917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->pending == 0) { 66017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->pending_out = s->pending_buf; 6618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 6638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 6658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflate (strm, flush) 6668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 6678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 6688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 6698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int old_flush; /* value of flush param for previous deflate call */ 6708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 6718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || 67317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner flush > Z_BLOCK || flush < 0) { 6748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 6758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 6778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->next_out == Z_NULL || 6798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (strm->next_in == Z_NULL && strm->avail_in != 0) || 6808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->status == FINISH_STATE && flush != Z_FINISH)) { 6818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ERR_RETURN(strm, Z_STREAM_ERROR); 6828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR); 6848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strm = strm; /* just in case */ 6868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project old_flush = s->last_flush; 6878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = flush; 6888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Write the header */ 6908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == INIT_STATE) { 6918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 6928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap == 2) { 6938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(0L, Z_NULL, 0); 6948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 31); 6958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 139); 6968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 8); 69717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->gzhead == Z_NULL) { 6988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 6998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 7008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 7018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 7028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 7038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->level == 9 ? 2 : 7048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? 7058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4 : 0)); 7068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, OS_CODE); 7078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = BUSY_STATE; 7088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else { 7108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (s->gzhead->text ? 1 : 0) + 7118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->gzhead->hcrc ? 2 : 0) + 7128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->gzhead->extra == Z_NULL ? 0 : 4) + 7138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->gzhead->name == Z_NULL ? 0 : 8) + 7148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->gzhead->comment == Z_NULL ? 0 : 16) 7158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ); 7168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(s->gzhead->time & 0xff)); 7178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff)); 7188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff)); 7198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff)); 7208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->level == 9 ? 2 : 7218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? 7228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4 : 0)); 7238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->gzhead->os & 0xff); 72417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->gzhead->extra != Z_NULL) { 7258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->gzhead->extra_len & 0xff); 7268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (s->gzhead->extra_len >> 8) & 0xff); 7278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc) 7298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf, 7308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending); 7318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzindex = 0; 7328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = EXTRA_STATE; 7338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 7368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 7378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 7388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8; 7398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt level_flags; 7408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2) 7428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project level_flags = 0; 7438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (s->level < 6) 7448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project level_flags = 1; 7458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (s->level == 6) 7468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project level_flags = 2; 7478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 7488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project level_flags = 3; 7498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project header |= (level_flags << 6); 7508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart != 0) header |= PRESET_DICT; 7518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project header += 31 - (header % 31); 7528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = BUSY_STATE; 7548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, header); 7558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Save the adler32 of the preset dictionary: */ 7578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart != 0) { 7588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, (uInt)(strm->adler >> 16)); 7598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, (uInt)(strm->adler & 0xffff)); 7608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = adler32(0L, Z_NULL, 0); 7628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 7658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == EXTRA_STATE) { 76617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->gzhead->extra != Z_NULL) { 7678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 7688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project while (s->gzindex < (s->gzhead->extra_len & 0xffff)) { 7708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 7718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 7748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 7758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project beg = s->pending; 7768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) 7778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 7788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->gzhead->extra[s->gzindex]); 7808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzindex++; 7818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 7858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzindex == s->gzhead->extra_len) { 7868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzindex = 0; 7878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = NAME_STATE; 7888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 7918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = NAME_STATE; 7928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == NAME_STATE) { 79417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->gzhead->name != Z_NULL) { 7958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 7968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int val; 7978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 7998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 8008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 8018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 8028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 8038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 8048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project beg = s->pending; 8058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 8068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project val = 1; 8078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 8088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project val = s->gzhead->name[s->gzindex++]; 8118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, val); 8128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (val != 0); 8138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 8148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 8158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 8168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (val == 0) { 8178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzindex = 0; 8188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = COMMENT_STATE; 8198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 8228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = COMMENT_STATE; 8238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == COMMENT_STATE) { 82517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->gzhead->comment != Z_NULL) { 8268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 8278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int val; 8288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 8308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 8318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 8328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 8338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 8348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 8358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project beg = s->pending; 8368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 8378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project val = 1; 8388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 8398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project val = s->gzhead->comment[s->gzindex++]; 8428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, val); 8438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (val != 0); 8448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 8458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 8468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 8478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (val == 0) 8488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = HCRC_STATE; 8498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 8518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = HCRC_STATE; 8528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == HCRC_STATE) { 8548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc) { 8558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending + 2 > s->pending_buf_size) 8568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 8578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending + 2 <= s->pending_buf_size) { 8588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(strm->adler & 0xff)); 8598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); 8608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(0L, Z_NULL, 0); 8618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = BUSY_STATE; 8628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 8658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = BUSY_STATE; 8668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 8688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Flush as much pending output as possible */ 8708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending != 0) { 8718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 8728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_out == 0) { 8738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Since avail_out is 0, deflate will be called again with 8748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * more output space, but possibly with both pending and 8758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * avail_in equal to zero. There won't be anything to do, 8768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * but this is not an error situation so make sure we 8778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * return OK instead of BUF_ERROR at next call of deflate: 8788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 8798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = -1; 8808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 8818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Make sure there is something to do and avoid duplicate consecutive 8848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * flushes. For repeated and useless calls with Z_FINISH, we keep 8858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * returning Z_STREAM_END instead of Z_BUF_ERROR. 8868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 88717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } else if (strm->avail_in == 0 && RANK(flush) <= RANK(old_flush) && 8888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush != Z_FINISH) { 8898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ERR_RETURN(strm, Z_BUF_ERROR); 8908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* User must not provide more input after the first FINISH: */ 8938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == FINISH_STATE && strm->avail_in != 0) { 8948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ERR_RETURN(strm, Z_BUF_ERROR); 8958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Start a new block or continue the current one. 8988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 8998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_in != 0 || s->lookahead != 0 || 9008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) { 9018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project block_state bstate; 9028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 90317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner bstate = s->strategy == Z_HUFFMAN_ONLY ? deflate_huff(s, flush) : 90417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner (s->strategy == Z_RLE ? deflate_rle(s, flush) : 90517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner (*(configuration_table[s->level].func))(s, flush)); 9068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bstate == finish_started || bstate == finish_done) { 9088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = FINISH_STATE; 9098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bstate == need_more || bstate == finish_started) { 9118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_out == 0) { 9128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = -1; /* avoid BUF_ERROR next call, see above */ 9138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 9158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If flush != Z_NO_FLUSH && avail_out == 0, the next call 9168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of deflate should use the same flush parameter to make sure 9178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * that the flush is complete. So we don't have to output an 9188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * empty block here, this will be done at next call. This also 9198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * ensures that for a very small output buffer, we emit at most 9208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * one empty block. 9218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 9228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bstate == block_done) { 9248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (flush == Z_PARTIAL_FLUSH) { 9258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_align(s); 92617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } else if (flush != Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */ 9278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_stored_block(s, (char*)0, 0L, 0); 9288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* For a full flush, this empty block will be recognized 9298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * as a special marker by inflate_sync(). 9308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 9318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (flush == Z_FULL_FLUSH) { 9328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project CLEAR_HASH(s); /* forget history */ 93317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->lookahead == 0) { 93417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->strstart = 0; 93517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->block_start = 0L; 93617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert = 0; 93717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 9388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 9418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_out == 0) { 9428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */ 9438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 9448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(strm->avail_out > 0, "bug2"); 9488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (flush != Z_FINISH) return Z_OK; 9508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap <= 0) return Z_STREAM_END; 9518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Write the trailer */ 9538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 9548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap == 2) { 9558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(strm->adler & 0xff)); 9568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); 9578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->adler >> 16) & 0xff)); 9588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->adler >> 24) & 0xff)); 9598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(strm->total_in & 0xff)); 9608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 8) & 0xff)); 9618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 16) & 0xff)); 9628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 24) & 0xff)); 9638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 9658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 9668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 9678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, (uInt)(strm->adler >> 16)); 9688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, (uInt)(strm->adler & 0xffff)); 9698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 9718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If avail_out is zero, the application will call deflate again 9728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to flush the rest. 9738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 9748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap > 0) s->wrap = -s->wrap; /* write the trailer only once! */ 9758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return s->pending != 0 ? Z_OK : Z_STREAM_END; 9768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 9778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 9798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateEnd (strm) 9808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 9818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 9828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int status; 9838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 9858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status = strm->state->status; 9878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (status != INIT_STATE && 9888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != EXTRA_STATE && 9898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != NAME_STATE && 9908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != COMMENT_STATE && 9918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != HCRC_STATE && 9928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != BUSY_STATE && 9938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != FINISH_STATE) { 9948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 9958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Deallocate in reverse order of allocations: */ 9988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project TRY_FREE(strm, strm->state->pending_buf); 9998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project TRY_FREE(strm, strm->state->head); 10008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project TRY_FREE(strm, strm->state->prev); 10018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project TRY_FREE(strm, strm->state->window); 10028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ZFREE(strm, strm->state); 10048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state = Z_NULL; 10058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK; 10078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 10088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= 10108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Copy the source state to the destination state. 10118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * To simplify the source, this is not supported for 16-bit MSDOS (which 10128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * doesn't have enough memory anyway to duplicate compression states). 10138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateCopy (dest, source) 10158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp dest; 10168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp source; 10178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 10188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef MAXSEG_64K 10198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 10208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 10218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *ds; 10228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *ss; 10238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ushf *overlay; 10248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (source == Z_NULL || dest == Z_NULL || source->state == Z_NULL) { 10278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 10288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 10298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ss = source->state; 10318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 103217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream)); 10338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state)); 10358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (ds == Z_NULL) return Z_MEM_ERROR; 10368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dest->state = (struct internal_state FAR *) ds; 103717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner zmemcpy((voidpf)ds, (voidpf)ss, sizeof(deflate_state)); 10388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->strm = dest; 10398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte)); 10418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->prev = (Posf *) ZALLOC(dest, ds->w_size, sizeof(Pos)); 10428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->head = (Posf *) ZALLOC(dest, ds->hash_size, sizeof(Pos)); 10438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2); 10448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->pending_buf = (uchf *) overlay; 10458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL || 10478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->pending_buf == Z_NULL) { 10488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflateEnd (dest); 10498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_MEM_ERROR; 10508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 10518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* following zmemcpy do not work for 16-bit MSDOS */ 10528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte)); 105317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner zmemcpy((voidpf)ds->prev, (voidpf)ss->prev, ds->w_size * sizeof(Pos)); 105417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner zmemcpy((voidpf)ds->head, (voidpf)ss->head, ds->hash_size * sizeof(Pos)); 10558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size); 10568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf); 10588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush); 10598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize; 10608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->l_desc.dyn_tree = ds->dyn_ltree; 10628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->d_desc.dyn_tree = ds->dyn_dtree; 10638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->bl_desc.dyn_tree = ds->bl_tree; 10648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 10668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* MAXSEG_64K */ 10678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 10688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 10708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Read a new buffer from the current input stream, update the adler32 10718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * and total number of bytes read. All deflate() input goes through 10728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * this function so some applications may wish to modify it to avoid 10738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * allocating a large strm->next_in buffer and copying from it. 10748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (See also flush_pending()). 10758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal int read_buf(strm, buf, size) 10778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 10788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Bytef *buf; 10798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned size; 10808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 10818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned len = strm->avail_in; 10828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len > size) len = size; 10848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len == 0) return 0; 10858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->avail_in -= len; 10878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 108817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner zmemcpy(buf, strm->next_in, len); 10898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->state->wrap == 1) { 109017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->adler = adler32(strm->adler, buf, len); 10918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 10928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 10938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (strm->state->wrap == 2) { 109417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strm->adler = crc32(strm->adler, buf, len); 10958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 10968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 10978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->next_in += len; 10988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->total_in += len; 10998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return (int)len; 11018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 11028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 11048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Initialize the "longest match" routines for a new zlib stream 11058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void lm_init (s) 11078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 11088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 11098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->window_size = (ulg)2L*s->w_size; 11108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project CLEAR_HASH(s); 11128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Set the default configuration parameters: 11148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_lazy_match = configuration_table[s->level].max_lazy; 11168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->good_match = configuration_table[s->level].good_length; 11178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->nice_match = configuration_table[s->level].nice_length; 11188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_chain_length = configuration_table[s->level].max_chain; 11198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart = 0; 11218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->block_start = 0L; 11228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead = 0; 112317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert = 0; 11248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = s->prev_length = MIN_MATCH-1; 11258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_available = 0; 11268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->ins_h = 0; 11278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 11288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef ASMV 11298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match_init(); /* initialize the asm code */ 11308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 11318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 11328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 11338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 11358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 11368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Set match_start to the longest match starting at the given string and 11378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * return its length. Matches shorter or equal to prev_length are discarded, 11388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * in which case the result is equal to prev_length and match_start is 11398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * garbage. 11408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertions: cur_match is the head of the hash chain for the current 11418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1 11428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * OUT assertion: the match length is not greater than s->lookahead. 11438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef ASMV 11458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* For 80x86 and 680x0, an optimized version will be provided in match.asm or 11468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * match.S. The code will be functionally equivalent. 11478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal uInt longest_match(s, cur_match) 11498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 11508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos cur_match; /* current match */ 11518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 11528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned chain_length = s->max_chain_length;/* max hash chain length */ 11538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *scan = s->window + s->strstart; /* current string */ 11548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *match; /* matched string */ 11558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register int len; /* length of current match */ 11568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int best_len = s->prev_length; /* best match length so far */ 11578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int nice_match = s->nice_match; /* stop if match long enough */ 11588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos limit = s->strstart > (IPos)MAX_DIST(s) ? 11598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart - (IPos)MAX_DIST(s) : NIL; 11608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Stop when cur_match becomes <= limit. To simplify the code, 11618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * we prevent matches with the string of window index 0. 11628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Posf *prev = s->prev; 11648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt wmask = s->w_mask; 11658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef UNALIGNED_OK 11678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Compare two bytes at a time. Note: this is not always beneficial. 11688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Try with and without -DUNALIGNED_OK to check. 11698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1; 11718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register ush scan_start = *(ushf*)scan; 11728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register ush scan_end = *(ushf*)(scan+best_len-1); 11738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 11748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH; 11758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Byte scan_end1 = scan[best_len-1]; 11768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Byte scan_end = scan[best_len]; 11778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 11788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. 11808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * It is easy to get rid of this optimization if necessary. 11818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); 11838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Do not waste too much time if we already have a good match: */ 11858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->prev_length >= s->good_match) { 11868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project chain_length >>= 2; 11878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 11888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Do not look for matches beyond the end of the input. This is necessary 11898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to make deflate deterministic. 11908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead; 11928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); 11948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 11968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(cur_match < s->strstart, "no future"); 11978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match = s->window + cur_match; 11988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Skip to next match if the match length cannot increase 12008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * or if the match length is less than 2. Note that the checks below 12018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * for insufficient lookahead only occur occasionally for performance 12028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * reasons. Therefore uninitialized memory will be accessed, and 12038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * conditional jumps will be made that depend on those values. 12048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * However the length of the match is limited to the lookahead, so 12058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the output of deflate is not affected by the uninitialized values. 12068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if (defined(UNALIGNED_OK) && MAX_MATCH == 258) 12088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This code assumes sizeof(unsigned short) == 2. Do not use 12098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * UNALIGNED_OK if your compiler uses a different size. 12108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (*(ushf*)(match+best_len-1) != scan_end || 12128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(ushf*)match != scan_start) continue; 12138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* It is not necessary to compare scan[2] and match[2] since they are 12158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * always equal when the other bytes match, given that the hash keys 12168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at 12178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart+3, +5, ... up to strstart+257. We check for insufficient 12188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * lookahead only every 4th comparison; the 128th check will be made 12198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is 12208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * necessary to put more guard bytes at the end of the window, or 12218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to check more often for insufficient lookahead. 12228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(scan[2] == match[2], "scan[2]?"); 12248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan++, match++; 12258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 12268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) && 12278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 12288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 12298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 12308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan < strend); 12318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The funny "do {}" generates better code on most compilers */ 12328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Here, scan <= window+strstart+257 */ 12348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 12358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (*scan == *match) scan++; 12368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project len = (MAX_MATCH - 1) - (int)(strend-scan); 12388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan = strend - (MAX_MATCH-1); 12398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else /* UNALIGNED_OK */ 12418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (match[best_len] != scan_end || 12438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match[best_len-1] != scan_end1 || 12448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *match != *scan || 12458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++match != scan[1]) continue; 12468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The check at best_len-1 can be removed because it will be made 12488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * again later. (This heuristic is not always a win.) 12498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * It is not necessary to compare scan[2] and match[2] since they 12508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * are always equal when the other bytes match, given that 12518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the hash keys are equal and that HASH_BITS >= 8. 12528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan += 2, match++; 12548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(*scan == *match, "match[2]?"); 12558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* We check for insufficient lookahead only every 8th comparison; 12578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the 256th check will be made at strstart+258. 12588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 12608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (*++scan == *++match && *++scan == *++match && 12618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 12628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 12638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 12648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan < strend); 12658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 12678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project len = MAX_MATCH - (int)(strend - scan); 12698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan = strend - MAX_MATCH; 12708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* UNALIGNED_OK */ 12728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len > best_len) { 12748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_start = cur_match; 12758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project best_len = len; 12768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len >= nice_match) break; 12778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef UNALIGNED_OK 12788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan_end = *(ushf*)(scan+best_len-1); 12798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 12808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan_end1 = scan[best_len-1]; 12818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan_end = scan[best_len]; 12828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 12838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 12848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while ((cur_match = prev[cur_match & wmask]) > limit 12858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project && --chain_length != 0); 12868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if ((uInt)best_len <= s->lookahead) return (uInt)best_len; 12888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return s->lookahead; 12898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 12908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* ASMV */ 129117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 129217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#else /* FASTEST */ 12938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* --------------------------------------------------------------------------- 129517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * Optimized version for FASTEST only 12968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 129717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turnerlocal uInt longest_match(s, cur_match) 12988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 12998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos cur_match; /* current match */ 13008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 13018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *scan = s->window + s->strstart; /* current string */ 13028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *match; /* matched string */ 13038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register int len; /* length of current match */ 13048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH; 13058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. 13078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * It is easy to get rid of this optimization if necessary. 13088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); 13108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); 13128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(cur_match < s->strstart, "no future"); 13148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match = s->window + cur_match; 13168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Return failure if the match length is less than 2: 13188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1; 13208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The check at best_len-1 can be removed because it will be made 13228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * again later. (This heuristic is not always a win.) 13238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * It is not necessary to compare scan[2] and match[2] since they 13248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * are always equal when the other bytes match, given that 13258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the hash keys are equal and that HASH_BITS >= 8. 13268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan += 2, match += 2; 13288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(*scan == *match, "match[2]?"); 13298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* We check for insufficient lookahead only every 8th comparison; 13318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the 256th check will be made at strstart+258. 13328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 13348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (*++scan == *++match && *++scan == *++match && 13358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 13368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 13378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 13388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan < strend); 13398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 13418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project len = MAX_MATCH - (int)(strend - scan); 13438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len < MIN_MATCH) return MIN_MATCH - 1; 13458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_start = cur_match; 13478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead; 13488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 13498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 135017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#endif /* FASTEST */ 135117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 13528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef DEBUG 13538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 13548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Check that the match at match_start is indeed a match. 13558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void check_match(s, start, match, length) 13578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 13588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos start, match; 13598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int length; 13608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 13618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* check that the match is indeed a match */ 13628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (zmemcmp(s->window + match, 13638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->window + start, length) != EQUAL) { 13648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fprintf(stderr, " start %u, match %u, length %d\n", 13658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project start, match, length); 13668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 13678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fprintf(stderr, "%c%c", s->window[match++], s->window[start++]); 13688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--length != 0); 13698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_error("invalid match"); 13708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 13718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (z_verbose > 1) { 13728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fprintf(stderr,"\\[%d,%d]", start-match, length); 13738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { putc(s->window[start++], stderr); } while (--length != 0); 13748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 13758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 13768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 13778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project# define check_match(s, start, match, length) 13788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* DEBUG */ 13798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 13818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Fill the window when the lookahead becomes insufficient. 13828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Updates strstart and lookahead. 13838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 13848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: lookahead < MIN_LOOKAHEAD 13858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD 13868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * At least one byte has been read, or avail_in == 0; reads are 13878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * performed for at least two bytes (required for the zip translate_eol 13888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * option -- not supported here). 13898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void fill_window(s) 13918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 13928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 13938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register unsigned n, m; 13948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Posf *p; 13958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned more; /* Amount of free space at the end of the window. */ 13968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt wsize = s->w_size; 13978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 139817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead"); 139917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 14008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 14018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart); 14028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Deal with !@#$% 64K limit: */ 14048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (sizeof(int) <= 2) { 14058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (more == 0 && s->strstart == 0 && s->lookahead == 0) { 14068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project more = wsize; 14078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else if (more == (unsigned)(-1)) { 14098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Very unlikely, but possible on 16 bit machine if 14108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart == 0 && lookahead == 1 (input done a byte at time) 14118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project more--; 14138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If the window is almost full and there is insufficient lookahead, 14178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * move the upper half to the lower one to make room in the upper half. 14188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart >= wsize+MAX_DIST(s)) { 14208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(s->window, s->window+wsize, (unsigned)wsize); 14228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_start -= wsize; 14238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart -= wsize; /* we now have strstart >= MAX_DIST */ 14248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->block_start -= (long) wsize; 14258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Slide the hash table (could be avoided with 32 bit values 14278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project at the expense of memory usage). We slide even when level == 0 14288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project to keep the hash table consistent if we switch back to level > 0 14298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project later. (Using level 0 permanently is not an optimal usage of 14308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zlib, so we don't care about this pathological case.) 14318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project n = s->hash_size; 14338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project p = &s->head[n]; 14348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 14358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project m = *--p; 14368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *p = (Pos)(m >= wsize ? m-wsize : NIL); 14378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--n); 14388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project n = wsize; 14408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 14418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project p = &s->prev[n]; 14428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 14438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project m = *--p; 14448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *p = (Pos)(m >= wsize ? m-wsize : NIL); 14458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If n is not on any hash chain, prev[n] is garbage but 14468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * its value will never be used. 14478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--n); 14498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 14508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project more += wsize; 14518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 145217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->strm->avail_in == 0) break; 14538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If there was no sliding: 14558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 && 14568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * more == window_size - lookahead - strstart 14578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1) 14588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * => more >= window_size - 2*WSIZE + 2 14598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * In the BIG_MEM or MMAP case (not yet supported), 14608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * window_size == input_size + MIN_LOOKAHEAD && 14618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD. 14628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Otherwise, window_size == 2*WSIZE so more >= 2. 14638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * If there was sliding, more >= WSIZE. So in all cases, more >= 2. 14648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(more >= 2, "more < 2"); 14668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more); 14688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead += n; 14698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Initialize the hash value now that we have some input: */ 147117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->lookahead + s->insert >= MIN_MATCH) { 147217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner uInt str = s->strstart - s->insert; 147317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->ins_h = s->window[str]; 147417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner UPDATE_HASH(s, s->ins_h, s->window[str + 1]); 14758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if MIN_MATCH != 3 14768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Call UPDATE_HASH() MIN_MATCH-3 more times 14778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 147817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner while (s->insert) { 147917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); 148017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#ifndef FASTEST 148117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->prev[str & s->w_mask] = s->head[s->ins_h]; 148217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#endif 148317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->head[s->ins_h] = (Pos)str; 148417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner str++; 148517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert--; 148617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->lookahead + s->insert < MIN_MATCH) 148717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner break; 148817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 14898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage, 14918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * but this is not important since only literal bytes will be emitted. 14928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0); 149517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 149617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* If the WIN_INIT bytes after the end of the current data have never been 149717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * written, then zero those bytes in order to avoid memory check reports of 149817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * the use of uninitialized (or uninitialised as Julian writes) bytes by 149917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * the longest match routines. Update the high water mark for the next 150017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * time through here. WIN_INIT is set to MAX_MATCH since the longest match 150117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead. 150217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner */ 150317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->high_water < s->window_size) { 150417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner ulg curr = s->strstart + (ulg)(s->lookahead); 150517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner ulg init; 150617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 150717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->high_water < curr) { 150817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* Previous high water mark below current data -- zero WIN_INIT 150917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * bytes or up to end of window, whichever is less. 151017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner */ 151117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner init = s->window_size - curr; 151217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (init > WIN_INIT) 151317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner init = WIN_INIT; 151417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner zmemzero(s->window + curr, (unsigned)init); 151517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->high_water = curr + init; 151617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 151717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner else if (s->high_water < (ulg)curr + WIN_INIT) { 151817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* High water mark at or above current data, but below current data 151917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up 152017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * to end of window, whichever is less. 152117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner */ 152217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner init = (ulg)curr + WIN_INIT - s->high_water; 152317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (init > s->window_size - s->high_water) 152417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner init = s->window_size - s->high_water; 152517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner zmemzero(s->window + s->high_water, (unsigned)init); 152617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->high_water += init; 152717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 152817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 152917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 153017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD, 153117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner "not enough room for search"); 15328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 15338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 15358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Flush the current block, with given end-of-file flag. 15368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: strstart is set to the end of the current match. 15378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 153817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#define FLUSH_BLOCK_ONLY(s, last) { \ 15398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_flush_block(s, (s->block_start >= 0L ? \ 15408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (charf *)&s->window[(unsigned)s->block_start] : \ 15418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (charf *)Z_NULL), \ 15428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (ulg)((long)s->strstart - s->block_start), \ 154317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner (last)); \ 15448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->block_start = s->strstart; \ 15458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(s->strm); \ 15468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracev((stderr,"[FLUSH]")); \ 15478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 15488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Same but force premature exit if necessary. */ 155017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner#define FLUSH_BLOCK(s, last) { \ 155117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK_ONLY(s, last); \ 155217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \ 15538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 15548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 15568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Copy without compression as much as possible from the input stream, return 15578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the current block state. 15588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * This function does not insert new strings in the dictionary since 15598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * uncompressible data is probably not useful. This function is used 15608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * only for the level=0 compression option. 15618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * NOTE: this function should be optimized to avoid extra copying from 15628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * window to pending_buf. 15638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_stored(s, flush) 15658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 15668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 15678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 15688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Stored blocks are limited to 0xffff bytes, pending_buf is limited 15698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to pending_buf_size, and each stored block has a 5 byte header: 15708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ulg max_block_size = 0xffff; 15728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ulg max_start; 15738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (max_block_size > s->pending_buf_size - 5) { 15758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project max_block_size = s->pending_buf_size - 5; 15768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 15778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Copy as much as possible from input to output: */ 15798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (;;) { 15808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Fill the window as much as possible: */ 15818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead <= 1) { 15828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(s->strstart < s->w_size+MAX_DIST(s) || 15848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->block_start >= (long)s->w_size, "slide too late"); 15858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fill_window(s); 15878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0 && flush == Z_NO_FLUSH) return need_more; 15888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 15908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 15918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(s->block_start >= 0L, "block gone"); 15928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart += s->lookahead; 15948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead = 0; 15958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Emit a stored block if pending_buf will be full: */ 15978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project max_start = s->block_start + max_block_size; 15988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart == 0 || (ulg)s->strstart >= max_start) { 15998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* strstart == 0 is possible when wraparound on 16-bit machine */ 16008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead = (uInt)(s->strstart - max_start); 16018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart = (uInt)max_start; 16028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK(s, 0); 16038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Flush if we may have to slide, otherwise block_start may become 16058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * negative and the data will be gone: 16068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart - (uInt)s->block_start >= MAX_DIST(s)) { 16088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK(s, 0); 16098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 161117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert = 0; 161217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (flush == Z_FINISH) { 161317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 1); 161417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return finish_done; 161517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 161617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if ((long)s->strstart > s->block_start) 161717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 0); 161817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return block_done; 16198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 16208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 16228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Compress as much as possible from the input stream, return the current 16238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * block state. 16248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * This function does not perform lazy evaluation of matches and inserts 16258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * new strings in the dictionary only for unmatched strings or for short 16268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * matches. It is used only for the fast compression options. 16278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_fast(s, flush) 16298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 16308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 16318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 163217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner IPos hash_head; /* head of the hash chain */ 16338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int bflush; /* set if current block must be flushed */ 16348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (;;) { 16368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Make sure that we always have enough lookahead, except 16378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 16388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * for the next match, plus MIN_MATCH bytes to insert the 16398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * string following the next match. 16408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD) { 16428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fill_window(s); 16438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { 16448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return need_more; 16458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 16478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Insert the string window[strstart .. strstart+2] in the 16508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * dictionary, and set hash_head to the head of the hash chain: 16518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 165217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner hash_head = NIL; 16538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead >= MIN_MATCH) { 16548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 16558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Find the longest match, discarding those <= prev_length. 16588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * At this point we have always match_length < MIN_MATCH 16598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) { 16618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* To simplify the code, we prevent matches with the string 16628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of window index 0 (in particular we have to avoid a match 16638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of the string with itself at the start of the input file). 16648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 166517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->match_length = longest_match (s, hash_head); 166617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* longest_match() sets match_start */ 16678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->match_length >= MIN_MATCH) { 16698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project check_match(s, s->strstart, s->match_start, s->match_length); 16708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_dist(s, s->strstart - s->match_start, 16728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length - MIN_MATCH, bflush); 16738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead -= s->match_length; 16758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Insert new strings in the hash table only if the match length 16778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * is not too large. This saves time but degrades compression. 16788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 16808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->match_length <= s->max_insert_length && 16818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead >= MIN_MATCH) { 16828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length--; /* string at strstart already in table */ 16838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 16848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 16858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 16868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* strstart never exceeds WSIZE-MAX_MATCH, so there are 16878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * always MIN_MATCH bytes ahead. 16888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--s->match_length != 0); 16908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 16918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else 16928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 16938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 16948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart += s->match_length; 16958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = 0; 16968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->ins_h = s->window[s->strstart]; 16978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]); 16988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if MIN_MATCH != 3 16998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Call UPDATE_HASH() MIN_MATCH-3 more times 17008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 17018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not 17028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * matter since it will be recomputed at next deflate call. 17038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 17048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else { 17068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* No match, output a literal byte */ 17078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart])); 17088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_lit (s, s->window[s->strstart], bflush); 17098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead--; 17108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 17118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 17138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 171417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1; 171517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (flush == Z_FINISH) { 171617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 1); 171717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return finish_done; 171817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 171917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->last_lit) 172017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 0); 172117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return block_done; 17228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 17238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 17258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 17268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Same as above, but achieves better compression. We use a lazy 17278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * evaluation for matches: a match is finally adopted only if there is 17288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * no better match at the next window position. 17298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 17308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_slow(s, flush) 17318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 17328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 17338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 173417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner IPos hash_head; /* head of hash chain */ 17358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int bflush; /* set if current block must be flushed */ 17368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Process the input block. */ 17388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (;;) { 17398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Make sure that we always have enough lookahead, except 17408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 17418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * for the next match, plus MIN_MATCH bytes to insert the 17428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * string following the next match. 17438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 17448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD) { 17458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fill_window(s); 17468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { 17478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return need_more; 17488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 17508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Insert the string window[strstart .. strstart+2] in the 17538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * dictionary, and set hash_head to the head of the hash chain: 17548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 175517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner hash_head = NIL; 17568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead >= MIN_MATCH) { 17578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 17588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Find the longest match, discarding those <= prev_length. 17618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 17628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->prev_length = s->match_length, s->prev_match = s->match_start; 17638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = MIN_MATCH-1; 17648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (hash_head != NIL && s->prev_length < s->max_lazy_match && 17668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart - hash_head <= MAX_DIST(s)) { 17678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* To simplify the code, we prevent matches with the string 17688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of window index 0 (in particular we have to avoid a match 17698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of the string with itself at the start of the input file). 17708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 177117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->match_length = longest_match (s, hash_head); 177217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* longest_match() sets match_start */ 17738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->match_length <= 5 && (s->strategy == Z_FILTERED 17758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if TOO_FAR <= 32767 17768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project || (s->match_length == MIN_MATCH && 17778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart - s->match_start > TOO_FAR) 17788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 17798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project )) { 17808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If prev_match is also MIN_MATCH, match_start is garbage 17828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * but we will ignore the current match anyway. 17838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 17848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = MIN_MATCH-1; 17858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If there was a match at the previous step and the current 17888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * match is not better, output the previous match: 17898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 17908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) { 17918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt max_insert = s->strstart + s->lookahead - MIN_MATCH; 17928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Do not insert strings in hash table beyond this. */ 17938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project check_match(s, s->strstart-1, s->prev_match, s->prev_length); 17958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_dist(s, s->strstart -1 - s->prev_match, 17978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->prev_length - MIN_MATCH, bflush); 17988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Insert in hash table all strings up to the end of the match. 18008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart-1 and strstart are already inserted. If there is not 18018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * enough lookahead, the last two strings are not inserted in 18028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the hash table. 18038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 18048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead -= s->prev_length-1; 18058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->prev_length -= 2; 18068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 18078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (++s->strstart <= max_insert) { 18088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 18098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 18108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--s->prev_length != 0); 18118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_available = 0; 18128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = MIN_MATCH-1; 18138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 18148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 18158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 18168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 18178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else if (s->match_available) { 18188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If there was no match at the previous position, output a 18198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * single literal. If there was a match but the current match 18208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * is longer, truncate the previous match to a single literal. 18218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 18228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart-1])); 18238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_lit(s, s->window[s->strstart-1], bflush); 18248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bflush) { 18258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK_ONLY(s, 0); 18268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 18278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 18288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead--; 18298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strm->avail_out == 0) return need_more; 18308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else { 18318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* There is no previous match to compare with, wait for 18328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the next step to decide. 18338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 18348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_available = 1; 18358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 18368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead--; 18378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 18388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 18398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert (flush != Z_NO_FLUSH, "no flush?"); 18408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->match_available) { 18418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart-1])); 18428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_lit(s, s->window[s->strstart-1], bflush); 18438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_available = 0; 18448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 184517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1; 184617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (flush == Z_FINISH) { 184717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 1); 184817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return finish_done; 184917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 185017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->last_lit) 185117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 0); 185217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return block_done; 18538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 18548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* FASTEST */ 18558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 18568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 18578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For Z_RLE, simply look for runs of bytes, generate matches only of distance 18588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * one. Do not maintain a hash table. (It will be regenerated if this run of 18598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * deflate switches away from Z_RLE.) 18608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 18618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_rle(s, flush) 18628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 18638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 18648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 186517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner int bflush; /* set if current block must be flushed */ 186617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner uInt prev; /* byte at distance one to match */ 186717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner Bytef *scan, *strend; /* scan goes up to strend for length of run */ 18688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 18698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (;;) { 18708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Make sure that we always have enough lookahead, except 18718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 187217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * for the longest run, plus one for the unrolled loop. 18738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 187417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->lookahead <= MAX_MATCH) { 18758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fill_window(s); 187617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->lookahead <= MAX_MATCH && flush == Z_NO_FLUSH) { 18778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return need_more; 18788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 18798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 18808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 18818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 18828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* See how many times the previous byte repeats */ 188317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->match_length = 0; 188417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->lookahead >= MIN_MATCH && s->strstart > 0) { 18858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan = s->window + s->strstart - 1; 188617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner prev = *scan; 188717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (prev == *++scan && prev == *++scan && prev == *++scan) { 188817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner strend = s->window + s->strstart + MAX_MATCH; 188917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner do { 189017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } while (prev == *++scan && prev == *++scan && 189117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner prev == *++scan && prev == *++scan && 189217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner prev == *++scan && prev == *++scan && 189317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner prev == *++scan && prev == *++scan && 189417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner scan < strend); 189517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->match_length = MAX_MATCH - (int)(strend - scan); 189617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->match_length > s->lookahead) 189717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->match_length = s->lookahead; 189817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 189917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan"); 19008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 19018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 19028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Emit match if have run of MIN_MATCH or longer, else emit literal */ 190317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->match_length >= MIN_MATCH) { 190417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner check_match(s, s->strstart, s->strstart - 1, s->match_length); 190517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 190617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner _tr_tally_dist(s, 1, s->match_length - MIN_MATCH, bflush); 190717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 190817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->lookahead -= s->match_length; 190917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->strstart += s->match_length; 191017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->match_length = 0; 19118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else { 19128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* No match, output a literal byte */ 19138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart])); 19148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_lit (s, s->window[s->strstart], bflush); 19158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead--; 19168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 19178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 19188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 19198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 192017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert = 0; 192117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (flush == Z_FINISH) { 192217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 1); 192317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return finish_done; 192417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 192517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->last_lit) 192617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 0); 192717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return block_done; 192817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner} 192917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 193017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner/* =========================================================================== 193117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table. 193217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner * (It will be regenerated if this run of deflate switches away from Huffman.) 193317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner */ 193417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turnerlocal block_state deflate_huff(s, flush) 193517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner deflate_state *s; 193617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner int flush; 193717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner{ 193817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner int bflush; /* set if current block must be flushed */ 193917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 194017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner for (;;) { 194117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* Make sure that we have a literal to write. */ 194217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->lookahead == 0) { 194317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner fill_window(s); 194417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->lookahead == 0) { 194517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (flush == Z_NO_FLUSH) 194617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return need_more; 194717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner break; /* flush the current block */ 194817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 194917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 195017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner 195117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner /* Output a literal byte */ 195217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->match_length = 0; 195317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner Tracevv((stderr,"%c", s->window[s->strstart])); 195417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner _tr_tally_lit (s, s->window[s->strstart], bflush); 195517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->lookahead--; 195617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->strstart++; 195717b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (bflush) FLUSH_BLOCK(s, 0); 195817b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 195917b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner s->insert = 0; 196017b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (flush == Z_FINISH) { 196117b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 1); 196217b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return finish_done; 196317b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner } 196417b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner if (s->last_lit) 196517b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner FLUSH_BLOCK(s, 0); 196617b20e6f38ad2263e47a6884c4f68ce9773d8b29David 'Digit' Turner return block_done; 19678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 1968