18b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* deflate.c -- compress data using the deflation algorithm 28b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Copyright (C) 1995-2005 Jean-loup Gailly. 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". 408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Available in http://www.ietf.org/rfc/rfc1951.txt 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[] = 558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project " deflate 1.2.3 Copyright 1995-2005 Jean-loup Gailly "; 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 828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void lm_init OF((deflate_state *s)); 838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void putShortMSB OF((deflate_state *s, uInt b)); 848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void flush_pending OF((z_streamp strm)); 858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal int read_buf OF((z_streamp strm, Bytef *buf, unsigned size)); 868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef ASMV 888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project void match_init OF((void)); /* asm code initialization */ 898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt longest_match OF((deflate_state *s, IPos cur_match)); 908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal uInt longest_match OF((deflate_state *s, IPos cur_match)); 928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal uInt longest_match_fast OF((deflate_state *s, IPos cur_match)); 958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef DEBUG 978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void check_match OF((deflate_state *s, IPos start, IPos match, 988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int length)); 998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 1028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Local data 1038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define NIL 0 1068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Tail of hash chains */ 1078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef TOO_FAR 1098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project# define TOO_FAR 4096 1108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */ 1128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1) 1148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Minimum amount of lookahead, except at the end of the input file. 1158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * See deflate.c for comments about the MIN_MATCH+1. 1168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Values for max_lazy_match, good_match and max_chain_length, depending on 1198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the desired pack level (0..9). The values given below have been tuned to 1208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * exclude worst case performance for pathological files. Better values may be 1218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * found for specific files. 1228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projecttypedef struct config_s { 1248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ush good_length; /* reduce lazy search above this match length */ 1258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ush max_lazy; /* do not perform lazy search above this match length */ 1268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ush nice_length; /* quit search above this match length */ 1278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ush max_chain; 1288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project compress_func func; 1298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} config; 1308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef FASTEST 1328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal const config configuration_table[2] = { 1338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* good lazy nice chain */ 1348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ 1358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 1 */ {4, 4, 8, 4, deflate_fast}}; /* max speed, no lazy matches */ 1368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 1378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal const config configuration_table[10] = { 1388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* good lazy nice chain */ 1398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ 1408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 1 */ {4, 4, 8, 4, deflate_fast}, /* max speed, no lazy matches */ 1418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 2 */ {4, 5, 16, 8, deflate_fast}, 1428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 3 */ {4, 6, 32, 32, deflate_fast}, 1438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 4 */ {4, 4, 16, 16, deflate_slow}, /* lazy matches */ 1458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 5 */ {8, 16, 32, 32, deflate_slow}, 1468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 6 */ {8, 16, 128, 128, deflate_slow}, 1478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 7 */ {8, 32, 128, 256, deflate_slow}, 1488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 8 */ {32, 128, 258, 1024, deflate_slow}, 1498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* 9 */ {32, 258, 258, 4096, deflate_slow}}; /* max compression */ 1508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4 1538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For deflate_fast() (levels <= 3) good is ignored and lazy has a different 1548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * meaning. 1558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define EQUAL 0 1588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* result of memcmp for equal strings */ 1598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef NO_DUMMY_DECL 1618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectstruct static_tree_desc_s {int dummy;}; /* for buggy compilers */ 1628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 1658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Update a hash value with the given input byte 1668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: all calls to to UPDATE_HASH are made with consecutive 1678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * input characters, so that a running hash key can be computed from the 1688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * previous key instead of complete recalculation each time. 1698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask) 1718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 1748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Insert string str in the dictionary and set match_head to the previous head 1758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of the hash chain (the most recent string with same hash key). Return 1768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the previous length of the hash chain. 1778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * If this file is compiled with -DFASTEST, the compression level is forced 1788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to 1, and no hash chains are maintained. 1798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: all calls to to INSERT_STRING are made with consecutive 1808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * input characters and the first MIN_MATCH bytes of str are valid 1818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (except for the last MIN_MATCH-1 bytes of the input file). 1828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef FASTEST 1848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define INSERT_STRING(s, str, match_head) \ 1858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ 1868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match_head = s->head[s->ins_h], \ 1878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->head[s->ins_h] = (Pos)(str)) 1888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 1898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define INSERT_STRING(s, str, match_head) \ 1908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ 1918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \ 1928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->head[s->ins_h] = (Pos)(str)) 1938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 1968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Initialize the hash table (avoiding 64K overflow for 16 bit systems). 1978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * prev[] will be initialized on the fly. 1988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 1998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define CLEAR_HASH(s) \ 2008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->head[s->hash_size-1] = NIL; \ 2018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head)); 2028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 2048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateInit_(strm, level, version, stream_size) 2058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 2068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int level; 2078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project const char *version; 2088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int stream_size; 2098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 2108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, 2118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Z_DEFAULT_STRATEGY, version, stream_size); 2128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* To do: ignore strm->next_in if we use it as window */ 2138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 2148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 2168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy, 2178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project version, stream_size) 2188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 2198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int level; 2208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int method; 2218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int windowBits; 2228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int memLevel; 2238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int strategy; 2248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project const char *version; 2258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int stream_size; 2268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 2278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 2288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int wrap = 1; 2298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project static const char my_version[] = ZLIB_VERSION; 2308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ushf *overlay; 2328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* We overlay pending_buf and d_buf+l_buf. This works since the average 2338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * output size for (length,distance) codes is <= 24 bits. 2348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 2358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (version == Z_NULL || version[0] != my_version[0] || 2378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project stream_size != sizeof(z_stream)) { 2388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_VERSION_ERROR; 2398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL) return Z_STREAM_ERROR; 2418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->msg = Z_NULL; 2438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->zalloc == (alloc_func)0) { 2448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->zalloc = zcalloc; 2458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->opaque = (voidpf)0; 2468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->zfree == (free_func)0) strm->zfree = zcfree; 2488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef FASTEST 2508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level != 0) level = 1; 2518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 2528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level == Z_DEFAULT_COMPRESSION) level = 6; 2538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 2548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (windowBits < 0) { /* suppress zlib wrapper */ 2568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project wrap = 0; 2578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project windowBits = -windowBits; 2588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 2608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (windowBits > 15) { 2618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project wrap = 2; /* write gzip wrapper instead */ 2628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project windowBits -= 16; 2638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 2658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED || 2668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project windowBits < 8 || windowBits > 15 || level < 0 || level > 9 || 2678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strategy < 0 || strategy > Z_FIXED) { 2688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 2698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (windowBits == 8) windowBits = 9; /* until 256-byte window bug fixed */ 2718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state)); 2728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s == Z_NULL) return Z_MEM_ERROR; 2738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state = (struct internal_state FAR *)s; 2748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strm = strm; 2758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->wrap = wrap; 2778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzhead = Z_NULL; 2788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->w_bits = windowBits; 2798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->w_size = 1 << s->w_bits; 2808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->w_mask = s->w_size - 1; 2818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->hash_bits = memLevel + 7; 2838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->hash_size = 1 << s->hash_bits; 2848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->hash_mask = s->hash_size - 1; 2858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH); 2868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte)); 2888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos)); 2898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos)); 2908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */ 2928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2); 2948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending_buf = (uchf *) overlay; 2958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L); 2968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL || 2988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending_buf == Z_NULL) { 2998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = FINISH_STATE; 3008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->msg = (char*)ERR_MSG(Z_MEM_ERROR); 3018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflateEnd (strm); 3028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_MEM_ERROR; 3038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->d_buf = overlay + s->lit_bufsize/sizeof(ush); 3058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize; 3068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->level = level; 3088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strategy = strategy; 3098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->method = (Byte)method; 3108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return deflateReset(strm); 3128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 3138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 3158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateSetDictionary (strm, dictionary, dictLength) 3168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 3178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project const Bytef *dictionary; 3188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt dictLength; 3198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 3208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 3218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt length = dictLength; 3228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt n; 3238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos hash_head = 0; 3248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || dictionary == Z_NULL || 3268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state->wrap == 2 || 3278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (strm->state->wrap == 1 && strm->state->status != INIT_STATE)) 3288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 3298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 3318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap) 3328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = adler32(strm->adler, dictionary, dictLength); 3338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (length < MIN_MATCH) return Z_OK; 3358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (length > MAX_DIST(s)) { 3368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project length = MAX_DIST(s); 3378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dictionary += dictLength - length; /* use the tail of the dictionary */ 3388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(s->window, dictionary, length); 3408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart = length; 3418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->block_start = (long)length; 3428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Insert all strings in the hash table (except for the last two bytes). 3448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * s->lookahead stays null, so s->ins_h will be recomputed at the next 3458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * call of fill_window. 3468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 3478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->ins_h = s->window[0]; 3488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project UPDATE_HASH(s, s->ins_h, s->window[1]); 3498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (n = 0; n <= length - MIN_MATCH; n++) { 3508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project INSERT_STRING(s, n, hash_head); 3518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (hash_head) hash_head = 0; /* to make compiler happy */ 3538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 3548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 3558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 3578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateReset (strm) 3588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 3598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 3608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 3618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || 3638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0) { 3648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 3658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->total_in = strm->total_out = 0; 3688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */ 3698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->data_type = Z_UNKNOWN; 3708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = (deflate_state *)strm->state; 3728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending = 0; 3738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending_out = s->pending_buf; 3748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap < 0) { 3768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->wrap = -s->wrap; /* was made negative by deflate(..., Z_FINISH); */ 3778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = s->wrap ? INIT_STATE : BUSY_STATE; 3798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = 3808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 3818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->wrap == 2 ? crc32(0L, Z_NULL, 0) : 3828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 3838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project adler32(0L, Z_NULL, 0); 3848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = Z_NO_FLUSH; 3858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_init(s); 3878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project lm_init(s); 3888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 3908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 3918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 3938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateSetHeader (strm, head) 3948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 3958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project gz_headerp head; 3968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 3978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 3988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->state->wrap != 2) return Z_STREAM_ERROR; 3998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state->gzhead = head; 4008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 4018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 4028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 4048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflatePrime (strm, bits, value) 4058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 4068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int bits; 4078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int value; 4088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 4098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 4108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state->bi_valid = bits; 4118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state->bi_buf = (ush)(value & ((1 << bits) - 1)); 4128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 4138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 4148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 4168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateParams(strm, level, strategy) 4178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 4188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int level; 4198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int strategy; 4208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 4218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 4228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project compress_func func; 4238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int err = Z_OK; 4248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 4268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 4278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef FASTEST 4298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level != 0) level = 1; 4308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 4318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level == Z_DEFAULT_COMPRESSION) level = 6; 4328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 4338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) { 4348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 4358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project func = configuration_table[s->level].func; 4378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (func != configuration_table[level].func && strm->total_in != 0) { 4398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Flush the last buffer: */ 4408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project err = deflate(strm, Z_PARTIAL_FLUSH); 4418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->level != level) { 4438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->level = level; 4448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_lazy_match = configuration_table[level].max_lazy; 4458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->good_match = configuration_table[level].good_length; 4468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->nice_match = configuration_table[level].nice_length; 4478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_chain_length = configuration_table[level].max_chain; 4488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strategy = strategy; 4508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return err; 4518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 4528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 4548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain) 4558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 4568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int good_length; 4578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int max_lazy; 4588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int nice_length; 4598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int max_chain; 4608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 4618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 4628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 4648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 4658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->good_match = good_length; 4668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_lazy_match = max_lazy; 4678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->nice_match = nice_length; 4688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_chain_length = max_chain; 4698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 4708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 4718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= 4738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For the default windowBits of 15 and memLevel of 8, this function returns 4748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * a close to exact, as well as small, upper bound on the compressed size. 4758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * They are coded as constants here for a reason--if the #define's are 4768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * changed, then this function needs to be changed as well. The return 4778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * value for 15 and 8 only works for those exact settings. 4788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 4798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For any setting other than those defaults for windowBits and memLevel, 4808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the value returned is a conservative worst case for the maximum expansion 4818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * resulting from using fixed blocks instead of stored blocks, which deflate 4828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * can emit on compressed data for some combinations of the parameters. 4838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 4848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * This function could be more sophisticated to provide closer upper bounds 4858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * for every combination of windowBits and memLevel, as well as wrap. 4868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * But even the conservative upper bound of about 14% expansion does not 4878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * seem onerous for output buffer allocation. 4888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 4898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source ProjectuLong ZEXPORT deflateBound(strm, sourceLen) 4908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 4918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uLong sourceLen; 4928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 4938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 4948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uLong destLen; 4958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* conservative upper bound */ 4978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project destLen = sourceLen + 4988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 11; 4998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* if can't get parameters, return conservative bound */ 5018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) 5028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return destLen; 5038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* if not default parameters, return conservative bound */ 5058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 5068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->w_bits != 15 || s->hash_bits != 8 + 7) 5078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return destLen; 5088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* default settings: return tight bound for that case */ 5108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return compressBound(sourceLen); 5118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 5128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= 5148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Put a short in the pending buffer. The 16-bit value is put in MSB order. 5158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: the stream state is correct and there is enough room in 5168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * pending_buf. 5178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 5188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void putShortMSB (s, b) 5198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 5208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt b; 5218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 5228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(b >> 8)); 5238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(b & 0xff)); 5248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 5258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= 5278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Flush as much pending output as possible. All deflate() output goes 5288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * through this function so some applications may wish to modify it 5298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to avoid allocating a large strm->next_out buffer and copying into it. 5308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (See also read_buf()). 5318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 5328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void flush_pending(strm) 5338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 5348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 5358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned len = strm->state->pending; 5368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len > strm->avail_out) len = strm->avail_out; 5388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len == 0) return; 5398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(strm->next_out, strm->state->pending_out, len); 5418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->next_out += len; 5428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state->pending_out += len; 5438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->total_out += len; 5448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->avail_out -= len; 5458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state->pending -= len; 5468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->state->pending == 0) { 5478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state->pending_out = strm->state->pending_buf; 5488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 5508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 5528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflate (strm, flush) 5538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 5548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 5558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 5568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int old_flush; /* value of flush param for previous deflate call */ 5578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 5588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || 5608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush > Z_FINISH || flush < 0) { 5618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 5628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s = strm->state; 5648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->next_out == Z_NULL || 5668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (strm->next_in == Z_NULL && strm->avail_in != 0) || 5678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->status == FINISH_STATE && flush != Z_FINISH)) { 5688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ERR_RETURN(strm, Z_STREAM_ERROR); 5698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR); 5718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strm = strm; /* just in case */ 5738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project old_flush = s->last_flush; 5748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = flush; 5758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Write the header */ 5778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == INIT_STATE) { 5788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 5798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap == 2) { 5808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(0L, Z_NULL, 0); 5818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 31); 5828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 139); 5838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 8); 5848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead == NULL) { 5858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 5868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 5878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 5888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 5898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, 0); 5908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->level == 9 ? 2 : 5918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? 5928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4 : 0)); 5938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, OS_CODE); 5948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = BUSY_STATE; 5958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else { 5978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (s->gzhead->text ? 1 : 0) + 5988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->gzhead->hcrc ? 2 : 0) + 5998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->gzhead->extra == Z_NULL ? 0 : 4) + 6008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->gzhead->name == Z_NULL ? 0 : 8) + 6018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->gzhead->comment == Z_NULL ? 0 : 16) 6028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ); 6038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(s->gzhead->time & 0xff)); 6048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff)); 6058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff)); 6068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff)); 6078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->level == 9 ? 2 : 6088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? 6098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4 : 0)); 6108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->gzhead->os & 0xff); 6118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->extra != NULL) { 6128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->gzhead->extra_len & 0xff); 6138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (s->gzhead->extra_len >> 8) & 0xff); 6148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc) 6168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf, 6178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending); 6188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzindex = 0; 6198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = EXTRA_STATE; 6208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 6238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 6248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 6258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8; 6268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt level_flags; 6278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2) 6298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project level_flags = 0; 6308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (s->level < 6) 6318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project level_flags = 1; 6328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (s->level == 6) 6338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project level_flags = 2; 6348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 6358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project level_flags = 3; 6368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project header |= (level_flags << 6); 6378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart != 0) header |= PRESET_DICT; 6388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project header += 31 - (header % 31); 6398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = BUSY_STATE; 6418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, header); 6428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Save the adler32 of the preset dictionary: */ 6448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart != 0) { 6458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, (uInt)(strm->adler >> 16)); 6468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, (uInt)(strm->adler & 0xffff)); 6478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = adler32(0L, Z_NULL, 0); 6498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 6528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == EXTRA_STATE) { 6538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->extra != NULL) { 6548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 6558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project while (s->gzindex < (s->gzhead->extra_len & 0xffff)) { 6578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 6588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 6598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 6608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 6618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 6628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project beg = s->pending; 6638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) 6648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 6658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, s->gzhead->extra[s->gzindex]); 6678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzindex++; 6688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 6708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 6718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 6728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzindex == s->gzhead->extra_len) { 6738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzindex = 0; 6748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = NAME_STATE; 6758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 6788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = NAME_STATE; 6798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == NAME_STATE) { 6818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->name != NULL) { 6828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 6838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int val; 6848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 6858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 6868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 6878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 6888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 6898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 6908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 6918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project beg = s->pending; 6928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 6938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project val = 1; 6948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 6958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 6978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project val = s->gzhead->name[s->gzindex++]; 6988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, val); 6998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (val != 0); 7008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 7038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (val == 0) { 7048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->gzindex = 0; 7058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = COMMENT_STATE; 7068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 7098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = COMMENT_STATE; 7108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == COMMENT_STATE) { 7128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->comment != NULL) { 7138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 7148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int val; 7158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 7178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 7188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 7218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 7228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project beg = s->pending; 7238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending == s->pending_buf_size) { 7248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project val = 1; 7258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 7268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project val = s->gzhead->comment[s->gzindex++]; 7298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, val); 7308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (val != 0); 7318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->pending - beg); 7348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (val == 0) 7358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = HCRC_STATE; 7368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 7388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = HCRC_STATE; 7398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == HCRC_STATE) { 7418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->gzhead->hcrc) { 7428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending + 2 > s->pending_buf_size) 7438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 7448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending + 2 <= s->pending_buf_size) { 7458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(strm->adler & 0xff)); 7468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); 7478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(0L, Z_NULL, 0); 7488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = BUSY_STATE; 7498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 7528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = BUSY_STATE; 7538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 7558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Flush as much pending output as possible */ 7578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->pending != 0) { 7588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 7598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_out == 0) { 7608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Since avail_out is 0, deflate will be called again with 7618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * more output space, but possibly with both pending and 7628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * avail_in equal to zero. There won't be anything to do, 7638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * but this is not an error situation so make sure we 7648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * return OK instead of BUF_ERROR at next call of deflate: 7658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 7668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = -1; 7678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 7688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Make sure there is something to do and avoid duplicate consecutive 7718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * flushes. For repeated and useless calls with Z_FINISH, we keep 7728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * returning Z_STREAM_END instead of Z_BUF_ERROR. 7738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 7748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else if (strm->avail_in == 0 && flush <= old_flush && 7758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush != Z_FINISH) { 7768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ERR_RETURN(strm, Z_BUF_ERROR); 7778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* User must not provide more input after the first FINISH: */ 7808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->status == FINISH_STATE && strm->avail_in != 0) { 7818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ERR_RETURN(strm, Z_BUF_ERROR); 7828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Start a new block or continue the current one. 7858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 7868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_in != 0 || s->lookahead != 0 || 7878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) { 7888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project block_state bstate; 7898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project bstate = (*(configuration_table[s->level].func))(s, flush); 7918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 7928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bstate == finish_started || bstate == finish_done) { 7938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->status = FINISH_STATE; 7948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bstate == need_more || bstate == finish_started) { 7968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_out == 0) { 7978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = -1; /* avoid BUF_ERROR next call, see above */ 7988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 7998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 8008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If flush != Z_NO_FLUSH && avail_out == 0, the next call 8018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of deflate should use the same flush parameter to make sure 8028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * that the flush is complete. So we don't have to output an 8038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * empty block here, this will be done at next call. This also 8048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * ensures that for a very small output buffer, we emit at most 8058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * one empty block. 8068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 8078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bstate == block_done) { 8098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (flush == Z_PARTIAL_FLUSH) { 8108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_align(s); 8118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else { /* FULL_FLUSH or SYNC_FLUSH */ 8128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_stored_block(s, (char*)0, 0L, 0); 8138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* For a full flush, this empty block will be recognized 8148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * as a special marker by inflate_sync(). 8158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 8168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (flush == Z_FULL_FLUSH) { 8178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project CLEAR_HASH(s); /* forget history */ 8188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 8218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->avail_out == 0) { 8228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */ 8238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 8248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(strm->avail_out > 0, "bug2"); 8288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (flush != Z_FINISH) return Z_OK; 8308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap <= 0) return Z_STREAM_END; 8318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Write the trailer */ 8338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 8348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap == 2) { 8358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(strm->adler & 0xff)); 8368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); 8378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->adler >> 16) & 0xff)); 8388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->adler >> 24) & 0xff)); 8398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)(strm->total_in & 0xff)); 8408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 8) & 0xff)); 8418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 16) & 0xff)); 8428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 24) & 0xff)); 8438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 8458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 8468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 8478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, (uInt)(strm->adler >> 16)); 8488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project putShortMSB(s, (uInt)(strm->adler & 0xffff)); 8498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(strm); 8518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If avail_out is zero, the application will call deflate again 8528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to flush the rest. 8538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 8548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->wrap > 0) s->wrap = -s->wrap; /* write the trailer only once! */ 8558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return s->pending != 0 ? Z_OK : Z_STREAM_END; 8568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 8578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= */ 8598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateEnd (strm) 8608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 8618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 8628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int status; 8638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 8658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status = strm->state->status; 8678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (status != INIT_STATE && 8688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != EXTRA_STATE && 8698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != NAME_STATE && 8708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != COMMENT_STATE && 8718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != HCRC_STATE && 8728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != BUSY_STATE && 8738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project status != FINISH_STATE) { 8748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 8758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 8768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Deallocate in reverse order of allocations: */ 8788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project TRY_FREE(strm, strm->state->pending_buf); 8798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project TRY_FREE(strm, strm->state->head); 8808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project TRY_FREE(strm, strm->state->prev); 8818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project TRY_FREE(strm, strm->state->window); 8828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ZFREE(strm, strm->state); 8848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->state = Z_NULL; 8858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK; 8878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 8888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 8898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* ========================================================================= 8908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Copy the source state to the destination state. 8918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * To simplify the source, this is not supported for 16-bit MSDOS (which 8928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * doesn't have enough memory anyway to duplicate compression states). 8938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 8948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectint ZEXPORT deflateCopy (dest, source) 8958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp dest; 8968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp source; 8978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 8988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef MAXSEG_64K 8998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 9008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 9018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *ds; 9028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *ss; 9038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ushf *overlay; 9048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (source == Z_NULL || dest == Z_NULL || source->state == Z_NULL) { 9078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_STREAM_ERROR; 9088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ss = source->state; 9118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(dest, source, sizeof(z_stream)); 9138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state)); 9158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (ds == Z_NULL) return Z_MEM_ERROR; 9168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dest->state = (struct internal_state FAR *) ds; 9178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(ds, ss, sizeof(deflate_state)); 9188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->strm = dest; 9198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte)); 9218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->prev = (Posf *) ZALLOC(dest, ds->w_size, sizeof(Pos)); 9228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->head = (Posf *) ZALLOC(dest, ds->hash_size, sizeof(Pos)); 9238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2); 9248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->pending_buf = (uchf *) overlay; 9258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL || 9278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->pending_buf == Z_NULL) { 9288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflateEnd (dest); 9298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_MEM_ERROR; 9308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* following zmemcpy do not work for 16-bit MSDOS */ 9328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte)); 9338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(ds->prev, ss->prev, ds->w_size * sizeof(Pos)); 9348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(ds->head, ss->head, ds->hash_size * sizeof(Pos)); 9358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size); 9368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf); 9388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush); 9398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize; 9408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->l_desc.dyn_tree = ds->dyn_ltree; 9428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->d_desc.dyn_tree = ds->dyn_dtree; 9438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ds->bl_desc.dyn_tree = ds->bl_tree; 9448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return Z_OK; 9468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* MAXSEG_64K */ 9478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 9488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 9508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Read a new buffer from the current input stream, update the adler32 9518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * and total number of bytes read. All deflate() input goes through 9528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * this function so some applications may wish to modify it to avoid 9538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * allocating a large strm->next_in buffer and copying from it. 9548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (See also flush_pending()). 9558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 9568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal int read_buf(strm, buf, size) 9578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_streamp strm; 9588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Bytef *buf; 9598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned size; 9608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 9618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned len = strm->avail_in; 9628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len > size) len = size; 9648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len == 0) return 0; 9658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->avail_in -= len; 9678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (strm->state->wrap == 1) { 9698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = adler32(strm->adler, strm->next_in, len); 9708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef GZIP 9728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (strm->state->wrap == 2) { 9738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->adler = crc32(strm->adler, strm->next_in, len); 9748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 9758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 9768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(buf, strm->next_in, len); 9778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->next_in += len; 9788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project strm->total_in += len; 9798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return (int)len; 9818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 9828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 9848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Initialize the "longest match" routines for a new zlib stream 9858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 9868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void lm_init (s) 9878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 9888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 9898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->window_size = (ulg)2L*s->w_size; 9908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project CLEAR_HASH(s); 9928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 9938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Set the default configuration parameters: 9948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 9958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_lazy_match = configuration_table[s->level].max_lazy; 9968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->good_match = configuration_table[s->level].good_length; 9978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->nice_match = configuration_table[s->level].nice_length; 9988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->max_chain_length = configuration_table[s->level].max_chain; 9998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart = 0; 10018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->block_start = 0L; 10028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead = 0; 10038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = s->prev_length = MIN_MATCH-1; 10048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_available = 0; 10058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->ins_h = 0; 10068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 10078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef ASMV 10088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match_init(); /* initialize the asm code */ 10098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 10108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 10118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 10128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 10148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 10158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Set match_start to the longest match starting at the given string and 10168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * return its length. Matches shorter or equal to prev_length are discarded, 10178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * in which case the result is equal to prev_length and match_start is 10188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * garbage. 10198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertions: cur_match is the head of the hash chain for the current 10208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1 10218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * OUT assertion: the match length is not greater than s->lookahead. 10228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef ASMV 10248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* For 80x86 and 680x0, an optimized version will be provided in match.asm or 10258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * match.S. The code will be functionally equivalent. 10268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal uInt longest_match(s, cur_match) 10288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 10298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos cur_match; /* current match */ 10308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 10318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned chain_length = s->max_chain_length;/* max hash chain length */ 10328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *scan = s->window + s->strstart; /* current string */ 10338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *match; /* matched string */ 10348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register int len; /* length of current match */ 10358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int best_len = s->prev_length; /* best match length so far */ 10368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int nice_match = s->nice_match; /* stop if match long enough */ 10378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos limit = s->strstart > (IPos)MAX_DIST(s) ? 10388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart - (IPos)MAX_DIST(s) : NIL; 10398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Stop when cur_match becomes <= limit. To simplify the code, 10408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * we prevent matches with the string of window index 0. 10418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Posf *prev = s->prev; 10438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt wmask = s->w_mask; 10448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef UNALIGNED_OK 10468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Compare two bytes at a time. Note: this is not always beneficial. 10478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Try with and without -DUNALIGNED_OK to check. 10488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1; 10508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register ush scan_start = *(ushf*)scan; 10518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register ush scan_end = *(ushf*)(scan+best_len-1); 10528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 10538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH; 10548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Byte scan_end1 = scan[best_len-1]; 10558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Byte scan_end = scan[best_len]; 10568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 10578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. 10598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * It is easy to get rid of this optimization if necessary. 10608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); 10628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Do not waste too much time if we already have a good match: */ 10648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->prev_length >= s->good_match) { 10658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project chain_length >>= 2; 10668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 10678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Do not look for matches beyond the end of the input. This is necessary 10688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to make deflate deterministic. 10698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead; 10718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); 10738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 10758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(cur_match < s->strstart, "no future"); 10768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match = s->window + cur_match; 10778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Skip to next match if the match length cannot increase 10798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * or if the match length is less than 2. Note that the checks below 10808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * for insufficient lookahead only occur occasionally for performance 10818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * reasons. Therefore uninitialized memory will be accessed, and 10828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * conditional jumps will be made that depend on those values. 10838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * However the length of the match is limited to the lookahead, so 10848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the output of deflate is not affected by the uninitialized values. 10858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if (defined(UNALIGNED_OK) && MAX_MATCH == 258) 10878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This code assumes sizeof(unsigned short) == 2. Do not use 10888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * UNALIGNED_OK if your compiler uses a different size. 10898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 10908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (*(ushf*)(match+best_len-1) != scan_end || 10918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(ushf*)match != scan_start) continue; 10928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 10938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* It is not necessary to compare scan[2] and match[2] since they are 10948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * always equal when the other bytes match, given that the hash keys 10958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at 10968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart+3, +5, ... up to strstart+257. We check for insufficient 10978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * lookahead only every 4th comparison; the 128th check will be made 10988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is 10998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * necessary to put more guard bytes at the end of the window, or 11008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to check more often for insufficient lookahead. 11018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(scan[2] == match[2], "scan[2]?"); 11038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan++, match++; 11048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 11058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) && 11068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 11078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 11088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 11098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan < strend); 11108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The funny "do {}" generates better code on most compilers */ 11118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Here, scan <= window+strstart+257 */ 11138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 11148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (*scan == *match) scan++; 11158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project len = (MAX_MATCH - 1) - (int)(strend-scan); 11178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan = strend - (MAX_MATCH-1); 11188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else /* UNALIGNED_OK */ 11208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (match[best_len] != scan_end || 11228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match[best_len-1] != scan_end1 || 11238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *match != *scan || 11248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++match != scan[1]) continue; 11258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The check at best_len-1 can be removed because it will be made 11278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * again later. (This heuristic is not always a win.) 11288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * It is not necessary to compare scan[2] and match[2] since they 11298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * are always equal when the other bytes match, given that 11308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the hash keys are equal and that HASH_BITS >= 8. 11318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan += 2, match++; 11338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(*scan == *match, "match[2]?"); 11348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* We check for insufficient lookahead only every 8th comparison; 11368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the 256th check will be made at strstart+258. 11378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 11398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (*++scan == *++match && *++scan == *++match && 11408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 11418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 11428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 11438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan < strend); 11448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 11468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project len = MAX_MATCH - (int)(strend - scan); 11488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan = strend - MAX_MATCH; 11498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* UNALIGNED_OK */ 11518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len > best_len) { 11538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_start = cur_match; 11548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project best_len = len; 11558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len >= nice_match) break; 11568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef UNALIGNED_OK 11578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan_end = *(ushf*)(scan+best_len-1); 11588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 11598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan_end1 = scan[best_len-1]; 11608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan_end = scan[best_len]; 11618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 11628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 11638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while ((cur_match = prev[cur_match & wmask]) > limit 11648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project && --chain_length != 0); 11658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if ((uInt)best_len <= s->lookahead) return (uInt)best_len; 11678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return s->lookahead; 11688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 11698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* ASMV */ 11708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* FASTEST */ 11718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* --------------------------------------------------------------------------- 11738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Optimized version for level == 1 or strategy == Z_RLE only 11748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal uInt longest_match_fast(s, cur_match) 11768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 11778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos cur_match; /* current match */ 11788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 11798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *scan = s->window + s->strstart; /* current string */ 11808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *match; /* matched string */ 11818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register int len; /* length of current match */ 11828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH; 11838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. 11858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * It is easy to get rid of this optimization if necessary. 11868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); 11888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); 11908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(cur_match < s->strstart, "no future"); 11928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project match = s->window + cur_match; 11948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Return failure if the match length is less than 2: 11968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 11978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1; 11988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 11998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* The check at best_len-1 can be removed because it will be made 12008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * again later. (This heuristic is not always a win.) 12018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * It is not necessary to compare scan[2] and match[2] since they 12028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * are always equal when the other bytes match, given that 12038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the hash keys are equal and that HASH_BITS >= 8. 12048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan += 2, match += 2; 12068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(*scan == *match, "match[2]?"); 12078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* We check for insufficient lookahead only every 8th comparison; 12098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the 256th check will be made at strstart+258. 12108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 12128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (*++scan == *++match && *++scan == *++match && 12138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 12148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 12158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *++scan == *++match && *++scan == *++match && 12168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan < strend); 12178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 12198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project len = MAX_MATCH - (int)(strend - scan); 12218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (len < MIN_MATCH) return MIN_MATCH - 1; 12238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_start = cur_match; 12258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead; 12268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 12278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef DEBUG 12298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 12308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Check that the match at match_start is indeed a match. 12318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void check_match(s, start, match, length) 12338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 12348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos start, match; 12358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int length; 12368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 12378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* check that the match is indeed a match */ 12388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (zmemcmp(s->window + match, 12398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->window + start, length) != EQUAL) { 12408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fprintf(stderr, " start %u, match %u, length %d\n", 12418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project start, match, length); 12428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 12438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fprintf(stderr, "%c%c", s->window[match++], s->window[start++]); 12448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--length != 0); 12458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project z_error("invalid match"); 12468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 12478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (z_verbose > 1) { 12488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fprintf(stderr,"\\[%d,%d]", start-match, length); 12498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { putc(s->window[start++], stderr); } while (--length != 0); 12508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 12518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 12528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 12538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project# define check_match(s, start, match, length) 12548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* DEBUG */ 12558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 12578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Fill the window when the lookahead becomes insufficient. 12588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Updates strstart and lookahead. 12598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 12608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: lookahead < MIN_LOOKAHEAD 12618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD 12628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * At least one byte has been read, or avail_in == 0; reads are 12638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * performed for at least two bytes (required for the zip translate_eol 12648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * option -- not supported here). 12658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal void fill_window(s) 12678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 12688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 12698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register unsigned n, m; 12708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project register Posf *p; 12718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned more; /* Amount of free space at the end of the window. */ 12728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt wsize = s->w_size; 12738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 12758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart); 12768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Deal with !@#$% 64K limit: */ 12788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (sizeof(int) <= 2) { 12798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (more == 0 && s->strstart == 0 && s->lookahead == 0) { 12808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project more = wsize; 12818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else if (more == (unsigned)(-1)) { 12838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Very unlikely, but possible on 16 bit machine if 12848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart == 0 && lookahead == 1 (input done a byte at time) 12858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project more--; 12878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 12888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 12898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If the window is almost full and there is insufficient lookahead, 12918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * move the upper half to the lower one to make room in the upper half. 12928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 12938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart >= wsize+MAX_DIST(s)) { 12948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 12958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zmemcpy(s->window, s->window+wsize, (unsigned)wsize); 12968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_start -= wsize; 12978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart -= wsize; /* we now have strstart >= MAX_DIST */ 12988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->block_start -= (long) wsize; 12998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Slide the hash table (could be avoided with 32 bit values 13018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project at the expense of memory usage). We slide even when level == 0 13028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project to keep the hash table consistent if we switch back to level > 0 13038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project later. (Using level 0 permanently is not an optimal usage of 13048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project zlib, so we don't care about this pathological case.) 13058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* %%% avoid this when Z_RLE */ 13078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project n = s->hash_size; 13088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project p = &s->head[n]; 13098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 13108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project m = *--p; 13118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *p = (Pos)(m >= wsize ? m-wsize : NIL); 13128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--n); 13138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project n = wsize; 13158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 13168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project p = &s->prev[n]; 13178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 13188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project m = *--p; 13198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *p = (Pos)(m >= wsize ? m-wsize : NIL); 13208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If n is not on any hash chain, prev[n] is garbage but 13218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * its value will never be used. 13228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--n); 13248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 13258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project more += wsize; 13268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 13278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strm->avail_in == 0) return; 13288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If there was no sliding: 13308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 && 13318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * more == window_size - lookahead - strstart 13328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1) 13338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * => more >= window_size - 2*WSIZE + 2 13348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * In the BIG_MEM or MMAP case (not yet supported), 13358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * window_size == input_size + MIN_LOOKAHEAD && 13368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD. 13378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Otherwise, window_size == 2*WSIZE so more >= 2. 13388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * If there was sliding, more >= WSIZE. So in all cases, more >= 2. 13398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(more >= 2, "more < 2"); 13418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more); 13438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead += n; 13448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Initialize the hash value now that we have some input: */ 13468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead >= MIN_MATCH) { 13478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->ins_h = s->window[s->strstart]; 13488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]); 13498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if MIN_MATCH != 3 13508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Call UPDATE_HASH() MIN_MATCH-3 more times 13518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 13528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 13538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage, 13548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * but this is not important since only literal bytes will be emitted. 13558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0); 13588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 13598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 13618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Flush the current block, with given end-of-file flag. 13628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * IN assertion: strstart is set to the end of the current match. 13638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define FLUSH_BLOCK_ONLY(s, eof) { \ 13658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_flush_block(s, (s->block_start >= 0L ? \ 13668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (charf *)&s->window[(unsigned)s->block_start] : \ 13678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (charf *)Z_NULL), \ 13688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (ulg)((long)s->strstart - s->block_start), \ 13698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (eof)); \ 13708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->block_start = s->strstart; \ 13718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project flush_pending(s->strm); \ 13728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracev((stderr,"[FLUSH]")); \ 13738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 13748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Same but force premature exit if necessary. */ 13768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define FLUSH_BLOCK(s, eof) { \ 13778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK_ONLY(s, eof); \ 13788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strm->avail_out == 0) return (eof) ? finish_started : need_more; \ 13798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 13808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 13818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 13828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Copy without compression as much as possible from the input stream, return 13838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the current block state. 13848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * This function does not insert new strings in the dictionary since 13858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * uncompressible data is probably not useful. This function is used 13868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * only for the level=0 compression option. 13878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * NOTE: this function should be optimized to avoid extra copying from 13888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * window to pending_buf. 13898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_stored(s, flush) 13918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 13928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 13938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 13948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Stored blocks are limited to 0xffff bytes, pending_buf is limited 13958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * to pending_buf_size, and each stored block has a 5 byte header: 13968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 13978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ulg max_block_size = 0xffff; 13988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project ulg max_start; 13998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (max_block_size > s->pending_buf_size - 5) { 14018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project max_block_size = s->pending_buf_size - 5; 14028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Copy as much as possible from input to output: */ 14058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (;;) { 14068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Fill the window as much as possible: */ 14078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead <= 1) { 14088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(s->strstart < s->w_size+MAX_DIST(s) || 14108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->block_start >= (long)s->w_size, "slide too late"); 14118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fill_window(s); 14138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0 && flush == Z_NO_FLUSH) return need_more; 14148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 14168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert(s->block_start >= 0L, "block gone"); 14188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart += s->lookahead; 14208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead = 0; 14218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Emit a stored block if pending_buf will be full: */ 14238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project max_start = s->block_start + max_block_size; 14248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart == 0 || (ulg)s->strstart >= max_start) { 14258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* strstart == 0 is possible when wraparound on 16-bit machine */ 14268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead = (uInt)(s->strstart - max_start); 14278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart = (uInt)max_start; 14288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK(s, 0); 14298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Flush if we may have to slide, otherwise block_start may become 14318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * negative and the data will be gone: 14328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart - (uInt)s->block_start >= MAX_DIST(s)) { 14348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK(s, 0); 14358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK(s, flush == Z_FINISH); 14388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return flush == Z_FINISH ? finish_done : block_done; 14398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 14408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 14428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Compress as much as possible from the input stream, return the current 14438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * block state. 14448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * This function does not perform lazy evaluation of matches and inserts 14458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * new strings in the dictionary only for unmatched strings or for short 14468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * matches. It is used only for the fast compression options. 14478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_fast(s, flush) 14498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 14508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 14518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 14528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos hash_head = NIL; /* head of the hash chain */ 14538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int bflush; /* set if current block must be flushed */ 14548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (;;) { 14568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Make sure that we always have enough lookahead, except 14578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 14588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * for the next match, plus MIN_MATCH bytes to insert the 14598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * string following the next match. 14608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD) { 14628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fill_window(s); 14638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { 14648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return need_more; 14658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 14678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Insert the string window[strstart .. strstart+2] in the 14708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * dictionary, and set hash_head to the head of the hash chain: 14718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead >= MIN_MATCH) { 14738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 14748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 14768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Find the longest match, discarding those <= prev_length. 14778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * At this point we have always match_length < MIN_MATCH 14788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) { 14808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* To simplify the code, we prevent matches with the string 14818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of window index 0 (in particular we have to avoid a match 14828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of the string with itself at the start of the input file). 14838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 14848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef FASTEST 14858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if ((s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) || 14868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (s->strategy == Z_RLE && s->strstart - hash_head == 1)) { 14878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = longest_match_fast (s, hash_head); 14888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 14908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) { 14918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = longest_match (s, hash_head); 14928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else if (s->strategy == Z_RLE && s->strstart - hash_head == 1) { 14938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = longest_match_fast (s, hash_head); 14948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 14968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* longest_match() or longest_match_fast() sets match_start */ 14978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 14988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->match_length >= MIN_MATCH) { 14998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project check_match(s, s->strstart, s->match_start, s->match_length); 15008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_dist(s, s->strstart - s->match_start, 15028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length - MIN_MATCH, bflush); 15038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead -= s->match_length; 15058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Insert new strings in the hash table only if the match length 15078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * is not too large. This saves time but degrades compression. 15088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 15108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->match_length <= s->max_insert_length && 15118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead >= MIN_MATCH) { 15128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length--; /* string at strstart already in table */ 15138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 15148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 15158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 15168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* strstart never exceeds WSIZE-MAX_MATCH, so there are 15178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * always MIN_MATCH bytes ahead. 15188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--s->match_length != 0); 15208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 15218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else 15228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 15238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 15248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart += s->match_length; 15258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = 0; 15268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->ins_h = s->window[s->strstart]; 15278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]); 15288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if MIN_MATCH != 3 15298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Call UPDATE_HASH() MIN_MATCH-3 more times 15308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 15318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not 15328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * matter since it will be recomputed at next deflate call. 15338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 15358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else { 15368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* No match, output a literal byte */ 15378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart])); 15388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_lit (s, s->window[s->strstart], bflush); 15398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead--; 15408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 15418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 15428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 15438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 15448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK(s, flush == Z_FINISH); 15458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return flush == Z_FINISH ? finish_done : block_done; 15468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 15478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifndef FASTEST 15498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 15508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Same as above, but achieves better compression. We use a lazy 15518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * evaluation for matches: a match is finally adopted only if there is 15528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * no better match at the next window position. 15538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_slow(s, flush) 15558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 15568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 15578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 15588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project IPos hash_head = NIL; /* head of hash chain */ 15598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int bflush; /* set if current block must be flushed */ 15608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Process the input block. */ 15628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (;;) { 15638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Make sure that we always have enough lookahead, except 15648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 15658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * for the next match, plus MIN_MATCH bytes to insert the 15668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * string following the next match. 15678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD) { 15698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fill_window(s); 15708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { 15718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return need_more; 15728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 15738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 15748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 15758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Insert the string window[strstart .. strstart+2] in the 15778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * dictionary, and set hash_head to the head of the hash chain: 15788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead >= MIN_MATCH) { 15808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 15818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 15828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Find the longest match, discarding those <= prev_length. 15848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->prev_length = s->match_length, s->prev_match = s->match_start; 15868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = MIN_MATCH-1; 15878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 15888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (hash_head != NIL && s->prev_length < s->max_lazy_match && 15898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart - hash_head <= MAX_DIST(s)) { 15908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* To simplify the code, we prevent matches with the string 15918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of window index 0 (in particular we have to avoid a match 15928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * of the string with itself at the start of the input file). 15938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 15948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) { 15958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = longest_match (s, hash_head); 15968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else if (s->strategy == Z_RLE && s->strstart - hash_head == 1) { 15978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = longest_match_fast (s, hash_head); 15988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 15998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* longest_match() or longest_match_fast() sets match_start */ 16008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->match_length <= 5 && (s->strategy == Z_FILTERED 16028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if TOO_FAR <= 32767 16038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project || (s->match_length == MIN_MATCH && 16048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart - s->match_start > TOO_FAR) 16058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 16068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project )) { 16078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If prev_match is also MIN_MATCH, match_start is garbage 16098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * but we will ignore the current match anyway. 16108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = MIN_MATCH-1; 16128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If there was a match at the previous step and the current 16158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * match is not better, output the previous match: 16168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) { 16188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt max_insert = s->strstart + s->lookahead - MIN_MATCH; 16198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Do not insert strings in hash table beyond this. */ 16208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project check_match(s, s->strstart-1, s->prev_match, s->prev_length); 16228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_dist(s, s->strstart -1 - s->prev_match, 16248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->prev_length - MIN_MATCH, bflush); 16258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Insert in hash table all strings up to the end of the match. 16278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * strstart-1 and strstart are already inserted. If there is not 16288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * enough lookahead, the last two strings are not inserted in 16298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the hash table. 16308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead -= s->prev_length-1; 16328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->prev_length -= 2; 16338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 16348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (++s->strstart <= max_insert) { 16358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 16368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (--s->prev_length != 0); 16388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_available = 0; 16398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_length = MIN_MATCH-1; 16408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 16418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 16438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else if (s->match_available) { 16458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* If there was no match at the previous position, output a 16468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * single literal. If there was a match but the current match 16478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * is longer, truncate the previous match to a single literal. 16488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart-1])); 16508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_lit(s, s->window[s->strstart-1], bflush); 16518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bflush) { 16528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK_ONLY(s, 0); 16538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 16558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead--; 16568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strm->avail_out == 0) return need_more; 16578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else { 16588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* There is no previous match to compare with, wait for 16598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * the next step to decide. 16608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_available = 1; 16628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 16638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead--; 16648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Assert (flush != Z_NO_FLUSH, "no flush?"); 16678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->match_available) { 16688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart-1])); 16698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_lit(s, s->window[s->strstart-1], bflush); 16708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->match_available = 0; 16718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 16728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK(s, flush == Z_FINISH); 16738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return flush == Z_FINISH ? finish_done : block_done; 16748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 16758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* FASTEST */ 16768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if 0 16788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* =========================================================================== 16798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For Z_RLE, simply look for runs of bytes, generate matches only of distance 16808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * one. Do not maintain a hash table. (It will be regenerated if this run of 16818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * deflate switches away from Z_RLE.) 16828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectlocal block_state deflate_rle(s, flush) 16848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project deflate_state *s; 16858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int flush; 16868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 16878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int bflush; /* set if current block must be flushed */ 16888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt run; /* length of run */ 16898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt max; /* maximum length of run */ 16908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project uInt prev; /* byte at distance one to match */ 16918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Bytef *scan; /* scan for end of run */ 16928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 16938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (;;) { 16948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Make sure that we always have enough lookahead, except 16958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 16968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * for the longest encodable run. 16978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 16988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MAX_MATCH) { 16998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project fill_window(s); 17008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead < MAX_MATCH && flush == Z_NO_FLUSH) { 17018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return need_more; 17028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 17048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* See how many times the previous byte repeats */ 17078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project run = 0; 17088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (s->strstart > 0) { /* if there is a previous byte, that is */ 17098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project max = s->lookahead < MAX_MATCH ? s->lookahead : MAX_MATCH; 17108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project scan = s->window + s->strstart - 1; 17118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project prev = *scan++; 17128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project do { 17138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (*scan++ != prev) 17148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 17158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } while (++run < max); 17168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 17188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* Emit match if have run of MIN_MATCH or longer, else emit literal */ 17198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (run >= MIN_MATCH) { 17208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project check_match(s, s->strstart, s->strstart - 1, run); 17218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_dist(s, 1, run - MIN_MATCH, bflush); 17228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead -= run; 17238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart += run; 17248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } else { 17258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* No match, output a literal byte */ 17268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart])); 17278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project _tr_tally_lit (s, s->window[s->strstart], bflush); 17288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->lookahead--; 17298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project s->strstart++; 17308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 17328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 17338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project FLUSH_BLOCK(s, flush == Z_FINISH); 17348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return flush == Z_FINISH ? finish_done : block_done; 17358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 17368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1737