deflate.c revision 9e38dfa2f95fce609707a0941f10af9a785288de
19e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* deflate.c -- compress data using the deflation algorithm 29e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Copyright (C) 1995-2005 Jean-loup Gailly. 39e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For conditions of distribution and use, see copyright notice in zlib.h 49e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 59e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 69e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 79e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * ALGORITHM 89e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 99e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * The "deflation" process depends on being able to identify portions 109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of the input text which are identical to earlier input (within a 119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * sliding window trailing behind the input currently being processed). 129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * The most straightforward technique turns out to be the fastest for 149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * most input files: try all possible matches and select the longest. 159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * The key feature of this algorithm is that insertions into the string 169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * dictionary are very simple and thus fast, and deletions are avoided 179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * completely. Insertions are performed at each input character, whereas 189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * string matches are performed only when the previous match ends. So it 199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * is preferable to spend more time in matches to allow very fast string 209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * insertions and avoid deletions. The matching algorithm for small 219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strings is inspired from that of Rabin & Karp. A brute force approach 229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * is used to find longer strings when a small match has been found. 239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * A similar algorithm is used in comic (by Jan-Mark Wams) and freeze 249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (by Leonid Broukhis). 259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * A previous version of this file used a more sophisticated algorithm 269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (by Fiala and Greene) which is guaranteed to run in linear amortized 279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * time, but has a larger average cost, uses more memory and is patented. 289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * However the F&G algorithm may be faster for some highly redundant 299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * files if the parameter max_chain_length (described below) is too large. 309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * ACKNOWLEDGEMENTS 329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * The idea of lazy evaluation of matches is due to Jan-Mark Wams, and 349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * I found it in 'freeze' written by Leonid Broukhis. 359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Thanks to many people for bug reports and testing. 369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * REFERENCES 389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Deutsch, L.P.,"DEFLATE Compressed Data Format Specification". 409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Available in http://www.ietf.org/rfc/rfc1951.txt 419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * A description of the Rabin and Karp algorithm is given in the book 439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * "Algorithms" by R. Sedgewick, Addison-Wesley, p252. 449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Fiala,E.R., and Greene,D.H. 469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595 479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* @(#) $Id$ */ 519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#include "deflate.h" 539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectconst char deflate_copyright[] = 559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project " deflate 1.2.3 Copyright 1995-2005 Jean-loup Gailly "; 569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project If you use the zlib library in a product, an acknowledgment is welcome 589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project in the documentation of your product. If for some reason you cannot 599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project include such an acknowledgment, I would appreciate that you keep this 609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project copyright string in the executable of your product. 619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Function prototypes. 659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projecttypedef enum { 679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project need_more, /* block not completed, need more input or more output */ 689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project block_done, /* block flush performed */ 699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project finish_started, /* finish started, need only more output at next deflate */ 709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project finish_done /* finish done, accept no more input or output */ 719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} block_state; 729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projecttypedef block_state (*compress_func) OF((deflate_state *s, int flush)); 749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Compression function. Returns the block state after the call. */ 759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void fill_window OF((deflate_state *s)); 779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_stored OF((deflate_state *s, int flush)); 789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_fast OF((deflate_state *s, int flush)); 799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_slow OF((deflate_state *s, int flush)); 819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void lm_init OF((deflate_state *s)); 839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void putShortMSB OF((deflate_state *s, uInt b)); 849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void flush_pending OF((z_streamp strm)); 859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal int read_buf OF((z_streamp strm, Bytef *buf, unsigned size)); 869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef ASMV 889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project void match_init OF((void)); /* asm code initialization */ 899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt longest_match OF((deflate_state *s, IPos cur_match)); 909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal uInt longest_match OF((deflate_state *s, IPos cur_match)); 929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal uInt longest_match_fast OF((deflate_state *s, IPos cur_match)); 959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef DEBUG 979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void check_match OF((deflate_state *s, IPos start, IPos match, 989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int length)); 999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 1029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Local data 1039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define NIL 0 1069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Tail of hash chains */ 1079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef TOO_FAR 1099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project# define TOO_FAR 4096 1109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */ 1129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1) 1149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Minimum amount of lookahead, except at the end of the input file. 1159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * See deflate.c for comments about the MIN_MATCH+1. 1169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Values for max_lazy_match, good_match and max_chain_length, depending on 1199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the desired pack level (0..9). The values given below have been tuned to 1209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * exclude worst case performance for pathological files. Better values may be 1219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * found for specific files. 1229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projecttypedef struct config_s { 1249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ush good_length; /* reduce lazy search above this match length */ 1259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ush max_lazy; /* do not perform lazy search above this match length */ 1269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ush nice_length; /* quit search above this match length */ 1279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ush max_chain; 1289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project compress_func func; 1299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} config; 1309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef FASTEST 1329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal const config configuration_table[2] = { 1339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* good lazy nice chain */ 1349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ 1359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 1 */ {4, 4, 8, 4, deflate_fast}}; /* max speed, no lazy matches */ 1369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 1379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal const config configuration_table[10] = { 1389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* good lazy nice chain */ 1399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ 1409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 1 */ {4, 4, 8, 4, deflate_fast}, /* max speed, no lazy matches */ 1419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 2 */ {4, 5, 16, 8, deflate_fast}, 1429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 3 */ {4, 6, 32, 32, deflate_fast}, 1439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 4 */ {4, 4, 16, 16, deflate_slow}, /* lazy matches */ 1459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 5 */ {8, 16, 32, 32, deflate_slow}, 1469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 6 */ {8, 16, 128, 128, deflate_slow}, 1479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 7 */ {8, 32, 128, 256, deflate_slow}, 1489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 8 */ {32, 128, 258, 1024, deflate_slow}, 1499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* 9 */ {32, 258, 258, 4096, deflate_slow}}; /* max compression */ 1509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4 1539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For deflate_fast() (levels <= 3) good is ignored and lazy has a different 1549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * meaning. 1559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define EQUAL 0 1589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* result of memcmp for equal strings */ 1599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef NO_DUMMY_DECL 1619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectstruct static_tree_desc_s {int dummy;}; /* for buggy compilers */ 1629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 1659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Update a hash value with the given input byte 1669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: all calls to to UPDATE_HASH are made with consecutive 1679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * input characters, so that a running hash key can be computed from the 1689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * previous key instead of complete recalculation each time. 1699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask) 1719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 1749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Insert string str in the dictionary and set match_head to the previous head 1759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of the hash chain (the most recent string with same hash key). Return 1769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the previous length of the hash chain. 1779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * If this file is compiled with -DFASTEST, the compression level is forced 1789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to 1, and no hash chains are maintained. 1799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: all calls to to INSERT_STRING are made with consecutive 1809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * input characters and the first MIN_MATCH bytes of str are valid 1819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (except for the last MIN_MATCH-1 bytes of the input file). 1829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef FASTEST 1849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define INSERT_STRING(s, str, match_head) \ 1859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ 1869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match_head = s->head[s->ins_h], \ 1879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->head[s->ins_h] = (Pos)(str)) 1889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 1899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define INSERT_STRING(s, str, match_head) \ 1909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ 1919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \ 1929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->head[s->ins_h] = (Pos)(str)) 1939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 1969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Initialize the hash table (avoiding 64K overflow for 16 bit systems). 1979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * prev[] will be initialized on the fly. 1989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 1999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define CLEAR_HASH(s) \ 2009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->head[s->hash_size-1] = NIL; \ 2019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head)); 2029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 2049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateInit_(strm, level, version, stream_size) 2059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 2069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int level; 2079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project const char *version; 2089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int stream_size; 2099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 2109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, 2119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Z_DEFAULT_STRATEGY, version, stream_size); 2129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* To do: ignore strm->next_in if we use it as window */ 2139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 2149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 2169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy, 2179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project version, stream_size) 2189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 2199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int level; 2209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int method; 2219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int windowBits; 2229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int memLevel; 2239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int strategy; 2249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project const char *version; 2259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int stream_size; 2269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 2279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 2289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int wrap = 1; 2299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project static const char my_version[] = ZLIB_VERSION; 2309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ushf *overlay; 2329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* We overlay pending_buf and d_buf+l_buf. This works since the average 2339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * output size for (length,distance) codes is <= 24 bits. 2349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 2359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (version == Z_NULL || version[0] != my_version[0] || 2379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project stream_size != sizeof(z_stream)) { 2389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_VERSION_ERROR; 2399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 2409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL) return Z_STREAM_ERROR; 2419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->msg = Z_NULL; 2439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->zalloc == (alloc_func)0) { 2449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->zalloc = zcalloc; 2459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->opaque = (voidpf)0; 2469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 2479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->zfree == (free_func)0) strm->zfree = zcfree; 2489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef FASTEST 2509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level != 0) level = 1; 2519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 2529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level == Z_DEFAULT_COMPRESSION) level = 6; 2539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 2549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (windowBits < 0) { /* suppress zlib wrapper */ 2569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project wrap = 0; 2579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project windowBits = -windowBits; 2589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 2599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 2609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else if (windowBits > 15) { 2619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project wrap = 2; /* write gzip wrapper instead */ 2629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project windowBits -= 16; 2639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 2649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 2659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED || 2669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project windowBits < 8 || windowBits > 15 || level < 0 || level > 9 || 2679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strategy < 0 || strategy > Z_FIXED) { 2689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 2699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 2709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (windowBits == 8) windowBits = 9; /* until 256-byte window bug fixed */ 2719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state)); 2729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s == Z_NULL) return Z_MEM_ERROR; 2739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state = (struct internal_state FAR *)s; 2749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strm = strm; 2759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->wrap = wrap; 2779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzhead = Z_NULL; 2789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->w_bits = windowBits; 2799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->w_size = 1 << s->w_bits; 2809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->w_mask = s->w_size - 1; 2819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->hash_bits = memLevel + 7; 2839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->hash_size = 1 << s->hash_bits; 2849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->hash_mask = s->hash_size - 1; 2859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH); 2869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte)); 2889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos)); 2899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos)); 2909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */ 2929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2); 2949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending_buf = (uchf *) overlay; 2959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L); 2969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 2979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL || 2989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending_buf == Z_NULL) { 2999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = FINISH_STATE; 3009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->msg = (char*)ERR_MSG(Z_MEM_ERROR); 3019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflateEnd (strm); 3029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_MEM_ERROR; 3039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 3049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->d_buf = overlay + s->lit_bufsize/sizeof(ush); 3059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize; 3069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->level = level; 3089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strategy = strategy; 3099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->method = (Byte)method; 3109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return deflateReset(strm); 3129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 3139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 3159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateSetDictionary (strm, dictionary, dictLength) 3169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 3179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project const Bytef *dictionary; 3189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt dictLength; 3199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 3209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 3219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt length = dictLength; 3229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt n; 3239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos hash_head = 0; 3249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || dictionary == Z_NULL || 3269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state->wrap == 2 || 3279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (strm->state->wrap == 1 && strm->state->status != INIT_STATE)) 3289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 3299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 3319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap) 3329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = adler32(strm->adler, dictionary, dictLength); 3339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (length < MIN_MATCH) return Z_OK; 3359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (length > MAX_DIST(s)) { 3369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project length = MAX_DIST(s); 3379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project dictionary += dictLength - length; /* use the tail of the dictionary */ 3389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 3399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(s->window, dictionary, length); 3409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart = length; 3419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->block_start = (long)length; 3429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Insert all strings in the hash table (except for the last two bytes). 3449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * s->lookahead stays null, so s->ins_h will be recomputed at the next 3459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * call of fill_window. 3469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 3479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->ins_h = s->window[0]; 3489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project UPDATE_HASH(s, s->ins_h, s->window[1]); 3499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project for (n = 0; n <= length - MIN_MATCH; n++) { 3509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project INSERT_STRING(s, n, hash_head); 3519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 3529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (hash_head) hash_head = 0; /* to make compiler happy */ 3539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 3549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 3559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 3579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateReset (strm) 3589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 3599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 3609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 3619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || 3639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0) { 3649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 3659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 3669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->total_in = strm->total_out = 0; 3689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */ 3699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->data_type = Z_UNKNOWN; 3709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = (deflate_state *)strm->state; 3729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending = 0; 3739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending_out = s->pending_buf; 3749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap < 0) { 3769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->wrap = -s->wrap; /* was made negative by deflate(..., Z_FINISH); */ 3779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 3789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = s->wrap ? INIT_STATE : BUSY_STATE; 3799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = 3809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 3819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->wrap == 2 ? crc32(0L, Z_NULL, 0) : 3829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 3839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project adler32(0L, Z_NULL, 0); 3849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = Z_NO_FLUSH; 3859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_init(s); 3879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project lm_init(s); 3889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 3909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 3919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 3929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 3939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateSetHeader (strm, head) 3949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 3959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project gz_headerp head; 3969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 3979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 3989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->state->wrap != 2) return Z_STREAM_ERROR; 3999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state->gzhead = head; 4009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 4019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 4029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 4049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflatePrime (strm, bits, value) 4059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 4069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int bits; 4079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int value; 4089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 4099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 4109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state->bi_valid = bits; 4119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state->bi_buf = (ush)(value & ((1 << bits) - 1)); 4129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 4139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 4149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 4169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateParams(strm, level, strategy) 4179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 4189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int level; 4199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int strategy; 4209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 4219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 4229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project compress_func func; 4239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int err = Z_OK; 4249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 4269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 4279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef FASTEST 4299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level != 0) level = 1; 4309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 4319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level == Z_DEFAULT_COMPRESSION) level = 6; 4329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 4339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) { 4349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 4359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 4369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project func = configuration_table[s->level].func; 4379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (func != configuration_table[level].func && strm->total_in != 0) { 4399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Flush the last buffer: */ 4409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project err = deflate(strm, Z_PARTIAL_FLUSH); 4419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 4429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->level != level) { 4439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->level = level; 4449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_lazy_match = configuration_table[level].max_lazy; 4459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->good_match = configuration_table[level].good_length; 4469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->nice_match = configuration_table[level].nice_length; 4479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_chain_length = configuration_table[level].max_chain; 4489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 4499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strategy = strategy; 4509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return err; 4519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 4529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 4549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain) 4559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 4569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int good_length; 4579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int max_lazy; 4589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int nice_length; 4599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int max_chain; 4609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 4619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 4629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 4649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 4659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->good_match = good_length; 4669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_lazy_match = max_lazy; 4679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->nice_match = nice_length; 4689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_chain_length = max_chain; 4699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 4709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 4719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= 4739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For the default windowBits of 15 and memLevel of 8, this function returns 4749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * a close to exact, as well as small, upper bound on the compressed size. 4759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * They are coded as constants here for a reason--if the #define's are 4769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * changed, then this function needs to be changed as well. The return 4779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * value for 15 and 8 only works for those exact settings. 4789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 4799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For any setting other than those defaults for windowBits and memLevel, 4809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the value returned is a conservative worst case for the maximum expansion 4819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * resulting from using fixed blocks instead of stored blocks, which deflate 4829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * can emit on compressed data for some combinations of the parameters. 4839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 4849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * This function could be more sophisticated to provide closer upper bounds 4859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * for every combination of windowBits and memLevel, as well as wrap. 4869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * But even the conservative upper bound of about 14% expansion does not 4879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * seem onerous for output buffer allocation. 4889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 4899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source ProjectuLong ZEXPORT deflateBound(strm, sourceLen) 4909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 4919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uLong sourceLen; 4929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 4939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 4949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uLong destLen; 4959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* conservative upper bound */ 4979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project destLen = sourceLen + 4989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 11; 4999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* if can't get parameters, return conservative bound */ 5019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) 5029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return destLen; 5039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* if not default parameters, return conservative bound */ 5059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 5069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->w_bits != 15 || s->hash_bits != 8 + 7) 5079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return destLen; 5089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* default settings: return tight bound for that case */ 5109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return compressBound(sourceLen); 5119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 5129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= 5149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Put a short in the pending buffer. The 16-bit value is put in MSB order. 5159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: the stream state is correct and there is enough room in 5169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * pending_buf. 5179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 5189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void putShortMSB (s, b) 5199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 5209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt b; 5219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 5229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(b >> 8)); 5239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(b & 0xff)); 5249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 5259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= 5279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Flush as much pending output as possible. All deflate() output goes 5289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * through this function so some applications may wish to modify it 5299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to avoid allocating a large strm->next_out buffer and copying into it. 5309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (See also read_buf()). 5319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 5329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void flush_pending(strm) 5339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 5349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 5359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project unsigned len = strm->state->pending; 5369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len > strm->avail_out) len = strm->avail_out; 5389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len == 0) return; 5399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(strm->next_out, strm->state->pending_out, len); 5419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->next_out += len; 5429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state->pending_out += len; 5439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->total_out += len; 5449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->avail_out -= len; 5459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state->pending -= len; 5469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->state->pending == 0) { 5479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state->pending_out = strm->state->pending_buf; 5489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 5499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 5509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 5529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflate (strm, flush) 5539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 5549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 5559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 5569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int old_flush; /* value of flush param for previous deflate call */ 5579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 5589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL || 5609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush > Z_FINISH || flush < 0) { 5619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 5629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 5639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s = strm->state; 5649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->next_out == Z_NULL || 5669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (strm->next_in == Z_NULL && strm->avail_in != 0) || 5679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->status == FINISH_STATE && flush != Z_FINISH)) { 5689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ERR_RETURN(strm, Z_STREAM_ERROR); 5699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 5709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR); 5719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strm = strm; /* just in case */ 5739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project old_flush = s->last_flush; 5749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = flush; 5759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 5769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Write the header */ 5779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == INIT_STATE) { 5789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 5799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap == 2) { 5809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(0L, Z_NULL, 0); 5819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 31); 5829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 139); 5839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 8); 5849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead == NULL) { 5859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 5869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 5879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 5889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 5899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, 0); 5909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->level == 9 ? 2 : 5919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? 5929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4 : 0)); 5939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, OS_CODE); 5949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = BUSY_STATE; 5959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 5969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else { 5979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (s->gzhead->text ? 1 : 0) + 5989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->gzhead->hcrc ? 2 : 0) + 5999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->gzhead->extra == Z_NULL ? 0 : 4) + 6009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->gzhead->name == Z_NULL ? 0 : 8) + 6019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->gzhead->comment == Z_NULL ? 0 : 16) 6029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ); 6039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(s->gzhead->time & 0xff)); 6049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff)); 6059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff)); 6069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff)); 6079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->level == 9 ? 2 : 6089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? 6099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 4 : 0)); 6109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->gzhead->os & 0xff); 6119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->extra != NULL) { 6129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->gzhead->extra_len & 0xff); 6139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (s->gzhead->extra_len >> 8) & 0xff); 6149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc) 6169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf, 6179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending); 6189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzindex = 0; 6199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = EXTRA_STATE; 6209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 6239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 6249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 6259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8; 6269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt level_flags; 6279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2) 6299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project level_flags = 0; 6309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else if (s->level < 6) 6319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project level_flags = 1; 6329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else if (s->level == 6) 6339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project level_flags = 2; 6349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 6359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project level_flags = 3; 6369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project header |= (level_flags << 6); 6379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart != 0) header |= PRESET_DICT; 6389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project header += 31 - (header % 31); 6399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = BUSY_STATE; 6419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, header); 6429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Save the adler32 of the preset dictionary: */ 6449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart != 0) { 6459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, (uInt)(strm->adler >> 16)); 6469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, (uInt)(strm->adler & 0xffff)); 6479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = adler32(0L, Z_NULL, 0); 6499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 6529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == EXTRA_STATE) { 6539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->extra != NULL) { 6549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 6559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project while (s->gzindex < (s->gzhead->extra_len & 0xffff)) { 6579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 6589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 6599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 6609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 6619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 6629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project beg = s->pending; 6639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) 6649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project break; 6659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, s->gzhead->extra[s->gzindex]); 6679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzindex++; 6689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 6709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 6719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 6729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzindex == s->gzhead->extra_len) { 6739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzindex = 0; 6749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = NAME_STATE; 6759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 6789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = NAME_STATE; 6799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == NAME_STATE) { 6819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->name != NULL) { 6829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 6839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int val; 6849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 6859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 6869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 6879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 6889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 6899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 6909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 6919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project beg = s->pending; 6929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 6939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project val = 1; 6949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project break; 6959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 6979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project val = s->gzhead->name[s->gzindex++]; 6989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, val); 6999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (val != 0); 7009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 7039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (val == 0) { 7049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->gzindex = 0; 7059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = COMMENT_STATE; 7069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 7099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = COMMENT_STATE; 7109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == COMMENT_STATE) { 7129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->comment != NULL) { 7139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt beg = s->pending; /* start of bytes to update crc */ 7149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int val; 7159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 7179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 7189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 7219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 7229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project beg = s->pending; 7239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending == s->pending_buf_size) { 7249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project val = 1; 7259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project break; 7269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project val = s->gzhead->comment[s->gzindex++]; 7299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, val); 7309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (val != 0); 7319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc && s->pending > beg) 7329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, s->pending_buf + beg, 7339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->pending - beg); 7349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (val == 0) 7359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = HCRC_STATE; 7369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 7389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = HCRC_STATE; 7399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == HCRC_STATE) { 7419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->gzhead->hcrc) { 7429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending + 2 > s->pending_buf_size) 7439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 7449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending + 2 <= s->pending_buf_size) { 7459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(strm->adler & 0xff)); 7469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); 7479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(0L, Z_NULL, 0); 7489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = BUSY_STATE; 7499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 7529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = BUSY_STATE; 7539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 7559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Flush as much pending output as possible */ 7579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->pending != 0) { 7589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 7599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_out == 0) { 7609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Since avail_out is 0, deflate will be called again with 7619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * more output space, but possibly with both pending and 7629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * avail_in equal to zero. There won't be anything to do, 7639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * but this is not an error situation so make sure we 7649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * return OK instead of BUF_ERROR at next call of deflate: 7659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 7669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = -1; 7679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 7689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Make sure there is something to do and avoid duplicate consecutive 7719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * flushes. For repeated and useless calls with Z_FINISH, we keep 7729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * returning Z_STREAM_END instead of Z_BUF_ERROR. 7739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 7749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else if (strm->avail_in == 0 && flush <= old_flush && 7759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush != Z_FINISH) { 7769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ERR_RETURN(strm, Z_BUF_ERROR); 7779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* User must not provide more input after the first FINISH: */ 7809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->status == FINISH_STATE && strm->avail_in != 0) { 7819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ERR_RETURN(strm, Z_BUF_ERROR); 7829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Start a new block or continue the current one. 7859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 7869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_in != 0 || s->lookahead != 0 || 7879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) { 7889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project block_state bstate; 7899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project bstate = (*(configuration_table[s->level].func))(s, flush); 7919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 7929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bstate == finish_started || bstate == finish_done) { 7939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->status = FINISH_STATE; 7949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bstate == need_more || bstate == finish_started) { 7969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_out == 0) { 7979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = -1; /* avoid BUF_ERROR next call, see above */ 7989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 7999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 8009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If flush != Z_NO_FLUSH && avail_out == 0, the next call 8019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of deflate should use the same flush parameter to make sure 8029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * that the flush is complete. So we don't have to output an 8039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * empty block here, this will be done at next call. This also 8049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * ensures that for a very small output buffer, we emit at most 8059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * one empty block. 8069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 8079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bstate == block_done) { 8099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (flush == Z_PARTIAL_FLUSH) { 8109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_align(s); 8119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else { /* FULL_FLUSH or SYNC_FLUSH */ 8129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_stored_block(s, (char*)0, 0L, 0); 8139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* For a full flush, this empty block will be recognized 8149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * as a special marker by inflate_sync(). 8159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 8169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (flush == Z_FULL_FLUSH) { 8179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project CLEAR_HASH(s); /* forget history */ 8189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 8219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->avail_out == 0) { 8229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */ 8239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 8249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(strm->avail_out > 0, "bug2"); 8289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (flush != Z_FINISH) return Z_OK; 8309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap <= 0) return Z_STREAM_END; 8319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Write the trailer */ 8339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 8349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap == 2) { 8359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(strm->adler & 0xff)); 8369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); 8379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->adler >> 16) & 0xff)); 8389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->adler >> 24) & 0xff)); 8399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)(strm->total_in & 0xff)); 8409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 8) & 0xff)); 8419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 16) & 0xff)); 8429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project put_byte(s, (Byte)((strm->total_in >> 24) & 0xff)); 8439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else 8459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 8469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 8479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, (uInt)(strm->adler >> 16)); 8489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project putShortMSB(s, (uInt)(strm->adler & 0xffff)); 8499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(strm); 8519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If avail_out is zero, the application will call deflate again 8529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to flush the rest. 8539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 8549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->wrap > 0) s->wrap = -s->wrap; /* write the trailer only once! */ 8559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return s->pending != 0 ? Z_OK : Z_STREAM_END; 8569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 8579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= */ 8599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateEnd (strm) 8609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 8619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 8629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int status; 8639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; 8659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status = strm->state->status; 8679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (status != INIT_STATE && 8689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != EXTRA_STATE && 8699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != NAME_STATE && 8709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != COMMENT_STATE && 8719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != HCRC_STATE && 8729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != BUSY_STATE && 8739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project status != FINISH_STATE) { 8749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 8759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 8769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Deallocate in reverse order of allocations: */ 8789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project TRY_FREE(strm, strm->state->pending_buf); 8799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project TRY_FREE(strm, strm->state->head); 8809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project TRY_FREE(strm, strm->state->prev); 8819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project TRY_FREE(strm, strm->state->window); 8829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ZFREE(strm, strm->state); 8849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->state = Z_NULL; 8859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK; 8879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 8889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 8899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* ========================================================================= 8909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Copy the source state to the destination state. 8919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * To simplify the source, this is not supported for 16-bit MSDOS (which 8929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * doesn't have enough memory anyway to duplicate compression states). 8939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 8949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectint ZEXPORT deflateCopy (dest, source) 8959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp dest; 8969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp source; 8979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 8989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef MAXSEG_64K 8999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 9009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 9019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *ds; 9029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *ss; 9039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ushf *overlay; 9049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (source == Z_NULL || dest == Z_NULL || source->state == Z_NULL) { 9079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_STREAM_ERROR; 9089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ss = source->state; 9119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(dest, source, sizeof(z_stream)); 9139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state)); 9159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (ds == Z_NULL) return Z_MEM_ERROR; 9169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project dest->state = (struct internal_state FAR *) ds; 9179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(ds, ss, sizeof(deflate_state)); 9189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->strm = dest; 9199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte)); 9219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->prev = (Posf *) ZALLOC(dest, ds->w_size, sizeof(Pos)); 9229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->head = (Posf *) ZALLOC(dest, ds->hash_size, sizeof(Pos)); 9239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2); 9249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->pending_buf = (uchf *) overlay; 9259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL || 9279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->pending_buf == Z_NULL) { 9289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflateEnd (dest); 9299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_MEM_ERROR; 9309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* following zmemcpy do not work for 16-bit MSDOS */ 9329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte)); 9339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(ds->prev, ss->prev, ds->w_size * sizeof(Pos)); 9349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(ds->head, ss->head, ds->hash_size * sizeof(Pos)); 9359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size); 9369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf); 9389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush); 9399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize; 9409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->l_desc.dyn_tree = ds->dyn_ltree; 9429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->d_desc.dyn_tree = ds->dyn_dtree; 9439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ds->bl_desc.dyn_tree = ds->bl_tree; 9449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return Z_OK; 9469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* MAXSEG_64K */ 9479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 9489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 9509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Read a new buffer from the current input stream, update the adler32 9519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * and total number of bytes read. All deflate() input goes through 9529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * this function so some applications may wish to modify it to avoid 9539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * allocating a large strm->next_in buffer and copying from it. 9549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * (See also flush_pending()). 9559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 9569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal int read_buf(strm, buf, size) 9579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_streamp strm; 9589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Bytef *buf; 9599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project unsigned size; 9609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 9619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project unsigned len = strm->avail_in; 9629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len > size) len = size; 9649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len == 0) return 0; 9659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->avail_in -= len; 9679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (strm->state->wrap == 1) { 9699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = adler32(strm->adler, strm->next_in, len); 9709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef GZIP 9729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project else if (strm->state->wrap == 2) { 9739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->adler = crc32(strm->adler, strm->next_in, len); 9749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 9759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 9769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(buf, strm->next_in, len); 9779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->next_in += len; 9789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project strm->total_in += len; 9799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return (int)len; 9819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 9829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 9849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Initialize the "longest match" routines for a new zlib stream 9859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 9869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void lm_init (s) 9879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 9889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 9899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->window_size = (ulg)2L*s->w_size; 9909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project CLEAR_HASH(s); 9929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 9939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Set the default configuration parameters: 9949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 9959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_lazy_match = configuration_table[s->level].max_lazy; 9969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->good_match = configuration_table[s->level].good_length; 9979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->nice_match = configuration_table[s->level].nice_length; 9989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->max_chain_length = configuration_table[s->level].max_chain; 9999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart = 0; 10019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->block_start = 0L; 10029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead = 0; 10039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = s->prev_length = MIN_MATCH-1; 10049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_available = 0; 10059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->ins_h = 0; 10069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 10079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef ASMV 10089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match_init(); /* initialize the asm code */ 10099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 10109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 10119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 10129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 10149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 10159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Set match_start to the longest match starting at the given string and 10169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * return its length. Matches shorter or equal to prev_length are discarded, 10179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * in which case the result is equal to prev_length and match_start is 10189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * garbage. 10199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertions: cur_match is the head of the hash chain for the current 10209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1 10219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * OUT assertion: the match length is not greater than s->lookahead. 10229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef ASMV 10249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* For 80x86 and 680x0, an optimized version will be provided in match.asm or 10259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * match.S. The code will be functionally equivalent. 10269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal uInt longest_match(s, cur_match) 10289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 10299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos cur_match; /* current match */ 10309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 10319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project unsigned chain_length = s->max_chain_length;/* max hash chain length */ 10329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *scan = s->window + s->strstart; /* current string */ 10339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *match; /* matched string */ 10349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register int len; /* length of current match */ 10359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int best_len = s->prev_length; /* best match length so far */ 10369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int nice_match = s->nice_match; /* stop if match long enough */ 10379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos limit = s->strstart > (IPos)MAX_DIST(s) ? 10389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart - (IPos)MAX_DIST(s) : NIL; 10399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Stop when cur_match becomes <= limit. To simplify the code, 10409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * we prevent matches with the string of window index 0. 10419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Posf *prev = s->prev; 10439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt wmask = s->w_mask; 10449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef UNALIGNED_OK 10469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Compare two bytes at a time. Note: this is not always beneficial. 10479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Try with and without -DUNALIGNED_OK to check. 10489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1; 10509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register ush scan_start = *(ushf*)scan; 10519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register ush scan_end = *(ushf*)(scan+best_len-1); 10529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 10539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH; 10549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Byte scan_end1 = scan[best_len-1]; 10559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Byte scan_end = scan[best_len]; 10569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 10579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. 10599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * It is easy to get rid of this optimization if necessary. 10609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); 10629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Do not waste too much time if we already have a good match: */ 10649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->prev_length >= s->good_match) { 10659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project chain_length >>= 2; 10669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 10679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Do not look for matches beyond the end of the input. This is necessary 10689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to make deflate deterministic. 10699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead; 10719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); 10739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 10759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(cur_match < s->strstart, "no future"); 10769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match = s->window + cur_match; 10779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Skip to next match if the match length cannot increase 10799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * or if the match length is less than 2. Note that the checks below 10809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * for insufficient lookahead only occur occasionally for performance 10819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * reasons. Therefore uninitialized memory will be accessed, and 10829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * conditional jumps will be made that depend on those values. 10839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * However the length of the match is limited to the lookahead, so 10849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the output of deflate is not affected by the uninitialized values. 10859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#if (defined(UNALIGNED_OK) && MAX_MATCH == 258) 10879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* This code assumes sizeof(unsigned short) == 2. Do not use 10889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * UNALIGNED_OK if your compiler uses a different size. 10899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 10909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (*(ushf*)(match+best_len-1) != scan_end || 10919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *(ushf*)match != scan_start) continue; 10929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 10939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* It is not necessary to compare scan[2] and match[2] since they are 10949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * always equal when the other bytes match, given that the hash keys 10959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at 10969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart+3, +5, ... up to strstart+257. We check for insufficient 10979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * lookahead only every 4th comparison; the 128th check will be made 10989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is 10999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * necessary to put more guard bytes at the end of the window, or 11009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to check more often for insufficient lookahead. 11019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(scan[2] == match[2], "scan[2]?"); 11039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan++, match++; 11049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 11059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) && 11069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 11079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 11089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *(ushf*)(scan+=2) == *(ushf*)(match+=2) && 11099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan < strend); 11109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The funny "do {}" generates better code on most compilers */ 11119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Here, scan <= window+strstart+257 */ 11139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 11149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (*scan == *match) scan++; 11159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project len = (MAX_MATCH - 1) - (int)(strend-scan); 11179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan = strend - (MAX_MATCH-1); 11189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else /* UNALIGNED_OK */ 11209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (match[best_len] != scan_end || 11229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match[best_len-1] != scan_end1 || 11239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *match != *scan || 11249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++match != scan[1]) continue; 11259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The check at best_len-1 can be removed because it will be made 11279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * again later. (This heuristic is not always a win.) 11289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * It is not necessary to compare scan[2] and match[2] since they 11299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * are always equal when the other bytes match, given that 11309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the hash keys are equal and that HASH_BITS >= 8. 11319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan += 2, match++; 11339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(*scan == *match, "match[2]?"); 11349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* We check for insufficient lookahead only every 8th comparison; 11369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the 256th check will be made at strstart+258. 11379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 11399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (*++scan == *++match && *++scan == *++match && 11409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 11419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 11429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 11439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan < strend); 11449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 11469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project len = MAX_MATCH - (int)(strend - scan); 11489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan = strend - MAX_MATCH; 11499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* UNALIGNED_OK */ 11519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len > best_len) { 11539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_start = cur_match; 11549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project best_len = len; 11559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len >= nice_match) break; 11569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef UNALIGNED_OK 11579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan_end = *(ushf*)(scan+best_len-1); 11589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 11599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan_end1 = scan[best_len-1]; 11609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan_end = scan[best_len]; 11619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 11629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 11639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while ((cur_match = prev[cur_match & wmask]) > limit 11649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project && --chain_length != 0); 11659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if ((uInt)best_len <= s->lookahead) return (uInt)best_len; 11679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return s->lookahead; 11689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 11699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* ASMV */ 11709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* FASTEST */ 11719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* --------------------------------------------------------------------------- 11739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Optimized version for level == 1 or strategy == Z_RLE only 11749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal uInt longest_match_fast(s, cur_match) 11769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 11779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos cur_match; /* current match */ 11789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 11799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *scan = s->window + s->strstart; /* current string */ 11809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *match; /* matched string */ 11819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register int len; /* length of current match */ 11829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Bytef *strend = s->window + s->strstart + MAX_MATCH; 11839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. 11859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * It is easy to get rid of this optimization if necessary. 11869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); 11889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); 11909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(cur_match < s->strstart, "no future"); 11929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project match = s->window + cur_match; 11949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Return failure if the match length is less than 2: 11969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 11979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1; 11989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 11999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* The check at best_len-1 can be removed because it will be made 12009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * again later. (This heuristic is not always a win.) 12019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * It is not necessary to compare scan[2] and match[2] since they 12029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * are always equal when the other bytes match, given that 12039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the hash keys are equal and that HASH_BITS >= 8. 12049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan += 2, match += 2; 12069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(*scan == *match, "match[2]?"); 12079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* We check for insufficient lookahead only every 8th comparison; 12099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the 256th check will be made at strstart+258. 12109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 12129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (*++scan == *++match && *++scan == *++match && 12139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 12149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 12159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *++scan == *++match && *++scan == *++match && 12169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan < strend); 12179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); 12199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project len = MAX_MATCH - (int)(strend - scan); 12219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (len < MIN_MATCH) return MIN_MATCH - 1; 12239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_start = cur_match; 12259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead; 12269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 12279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef DEBUG 12299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 12309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Check that the match at match_start is indeed a match. 12319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void check_match(s, start, match, length) 12339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 12349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos start, match; 12359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int length; 12369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 12379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* check that the match is indeed a match */ 12389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (zmemcmp(s->window + match, 12399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->window + start, length) != EQUAL) { 12409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fprintf(stderr, " start %u, match %u, length %d\n", 12419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project start, match, length); 12429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 12439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fprintf(stderr, "%c%c", s->window[match++], s->window[start++]); 12449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--length != 0); 12459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project z_error("invalid match"); 12469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 12479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (z_verbose > 1) { 12489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fprintf(stderr,"\\[%d,%d]", start-match, length); 12499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { putc(s->window[start++], stderr); } while (--length != 0); 12509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 12519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 12529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 12539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project# define check_match(s, start, match, length) 12549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* DEBUG */ 12559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 12579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Fill the window when the lookahead becomes insufficient. 12589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Updates strstart and lookahead. 12599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * 12609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: lookahead < MIN_LOOKAHEAD 12619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD 12629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * At least one byte has been read, or avail_in == 0; reads are 12639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * performed for at least two bytes (required for the zip translate_eol 12649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * option -- not supported here). 12659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal void fill_window(s) 12679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 12689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 12699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register unsigned n, m; 12709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project register Posf *p; 12719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project unsigned more; /* Amount of free space at the end of the window. */ 12729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt wsize = s->w_size; 12739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 12759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart); 12769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Deal with !@#$% 64K limit: */ 12789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (sizeof(int) <= 2) { 12799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (more == 0 && s->strstart == 0 && s->lookahead == 0) { 12809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project more = wsize; 12819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else if (more == (unsigned)(-1)) { 12839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Very unlikely, but possible on 16 bit machine if 12849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart == 0 && lookahead == 1 (input done a byte at time) 12859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project more--; 12879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 12889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 12899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If the window is almost full and there is insufficient lookahead, 12919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * move the upper half to the lower one to make room in the upper half. 12929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 12939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart >= wsize+MAX_DIST(s)) { 12949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 12959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zmemcpy(s->window, s->window+wsize, (unsigned)wsize); 12969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_start -= wsize; 12979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart -= wsize; /* we now have strstart >= MAX_DIST */ 12989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->block_start -= (long) wsize; 12999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Slide the hash table (could be avoided with 32 bit values 13019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project at the expense of memory usage). We slide even when level == 0 13029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project to keep the hash table consistent if we switch back to level > 0 13039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project later. (Using level 0 permanently is not an optimal usage of 13049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project zlib, so we don't care about this pathological case.) 13059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* %%% avoid this when Z_RLE */ 13079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project n = s->hash_size; 13089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project p = &s->head[n]; 13099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 13109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project m = *--p; 13119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *p = (Pos)(m >= wsize ? m-wsize : NIL); 13129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--n); 13139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project n = wsize; 13159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 13169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project p = &s->prev[n]; 13179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 13189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project m = *--p; 13199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project *p = (Pos)(m >= wsize ? m-wsize : NIL); 13209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If n is not on any hash chain, prev[n] is garbage but 13219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * its value will never be used. 13229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--n); 13249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 13259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project more += wsize; 13269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 13279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strm->avail_in == 0) return; 13289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If there was no sliding: 13309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 && 13319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * more == window_size - lookahead - strstart 13329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1) 13339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * => more >= window_size - 2*WSIZE + 2 13349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * In the BIG_MEM or MMAP case (not yet supported), 13359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * window_size == input_size + MIN_LOOKAHEAD && 13369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD. 13379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Otherwise, window_size == 2*WSIZE so more >= 2. 13389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * If there was sliding, more >= WSIZE. So in all cases, more >= 2. 13399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(more >= 2, "more < 2"); 13419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more); 13439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead += n; 13449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Initialize the hash value now that we have some input: */ 13469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead >= MIN_MATCH) { 13479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->ins_h = s->window[s->strstart]; 13489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]); 13499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#if MIN_MATCH != 3 13509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Call UPDATE_HASH() MIN_MATCH-3 more times 13519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 13529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 13539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage, 13549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * but this is not important since only literal bytes will be emitted. 13559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0); 13589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 13599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 13619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Flush the current block, with given end-of-file flag. 13629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * IN assertion: strstart is set to the end of the current match. 13639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define FLUSH_BLOCK_ONLY(s, eof) { \ 13659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_flush_block(s, (s->block_start >= 0L ? \ 13669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (charf *)&s->window[(unsigned)s->block_start] : \ 13679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (charf *)Z_NULL), \ 13689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (ulg)((long)s->strstart - s->block_start), \ 13699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (eof)); \ 13709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->block_start = s->strstart; \ 13719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project flush_pending(s->strm); \ 13729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracev((stderr,"[FLUSH]")); \ 13739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 13749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* Same but force premature exit if necessary. */ 13769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#define FLUSH_BLOCK(s, eof) { \ 13779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK_ONLY(s, eof); \ 13789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strm->avail_out == 0) return (eof) ? finish_started : need_more; \ 13799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 13809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 13819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 13829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Copy without compression as much as possible from the input stream, return 13839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the current block state. 13849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * This function does not insert new strings in the dictionary since 13859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * uncompressible data is probably not useful. This function is used 13869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * only for the level=0 compression option. 13879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * NOTE: this function should be optimized to avoid extra copying from 13889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * window to pending_buf. 13899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_stored(s, flush) 13919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 13929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 13939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 13949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Stored blocks are limited to 0xffff bytes, pending_buf is limited 13959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * to pending_buf_size, and each stored block has a 5 byte header: 13969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 13979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ulg max_block_size = 0xffff; 13989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project ulg max_start; 13999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (max_block_size > s->pending_buf_size - 5) { 14019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project max_block_size = s->pending_buf_size - 5; 14029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Copy as much as possible from input to output: */ 14059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project for (;;) { 14069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Fill the window as much as possible: */ 14079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead <= 1) { 14089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(s->strstart < s->w_size+MAX_DIST(s) || 14109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->block_start >= (long)s->w_size, "slide too late"); 14119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fill_window(s); 14139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0 && flush == Z_NO_FLUSH) return need_more; 14149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 14169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert(s->block_start >= 0L, "block gone"); 14189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart += s->lookahead; 14209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead = 0; 14219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Emit a stored block if pending_buf will be full: */ 14239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project max_start = s->block_start + max_block_size; 14249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart == 0 || (ulg)s->strstart >= max_start) { 14259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* strstart == 0 is possible when wraparound on 16-bit machine */ 14269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead = (uInt)(s->strstart - max_start); 14279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart = (uInt)max_start; 14289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK(s, 0); 14299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Flush if we may have to slide, otherwise block_start may become 14319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * negative and the data will be gone: 14329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart - (uInt)s->block_start >= MAX_DIST(s)) { 14349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK(s, 0); 14359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK(s, flush == Z_FINISH); 14389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return flush == Z_FINISH ? finish_done : block_done; 14399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 14409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 14429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Compress as much as possible from the input stream, return the current 14439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * block state. 14449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * This function does not perform lazy evaluation of matches and inserts 14459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * new strings in the dictionary only for unmatched strings or for short 14469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * matches. It is used only for the fast compression options. 14479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_fast(s, flush) 14499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 14509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 14519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 14529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos hash_head = NIL; /* head of the hash chain */ 14539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int bflush; /* set if current block must be flushed */ 14549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project for (;;) { 14569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Make sure that we always have enough lookahead, except 14579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 14589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * for the next match, plus MIN_MATCH bytes to insert the 14599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * string following the next match. 14609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD) { 14629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fill_window(s); 14639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { 14649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return need_more; 14659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 14679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Insert the string window[strstart .. strstart+2] in the 14709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * dictionary, and set hash_head to the head of the hash chain: 14719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead >= MIN_MATCH) { 14739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 14749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 14769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Find the longest match, discarding those <= prev_length. 14779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * At this point we have always match_length < MIN_MATCH 14789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) { 14809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* To simplify the code, we prevent matches with the string 14819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of window index 0 (in particular we have to avoid a match 14829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of the string with itself at the start of the input file). 14839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 14849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifdef FASTEST 14859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if ((s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) || 14869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project (s->strategy == Z_RLE && s->strstart - hash_head == 1)) { 14879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = longest_match_fast (s, hash_head); 14889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#else 14909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) { 14919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = longest_match (s, hash_head); 14929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else if (s->strategy == Z_RLE && s->strstart - hash_head == 1) { 14939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = longest_match_fast (s, hash_head); 14949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 14969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* longest_match() or longest_match_fast() sets match_start */ 14979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 14989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->match_length >= MIN_MATCH) { 14999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project check_match(s, s->strstart, s->match_start, s->match_length); 15009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_dist(s, s->strstart - s->match_start, 15029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length - MIN_MATCH, bflush); 15039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead -= s->match_length; 15059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Insert new strings in the hash table only if the match length 15079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * is not too large. This saves time but degrades compression. 15089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 15109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->match_length <= s->max_insert_length && 15119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead >= MIN_MATCH) { 15129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length--; /* string at strstart already in table */ 15139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 15149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 15159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 15169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* strstart never exceeds WSIZE-MAX_MATCH, so there are 15179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * always MIN_MATCH bytes ahead. 15189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--s->match_length != 0); 15209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 15219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else 15229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 15239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 15249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart += s->match_length; 15259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = 0; 15269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->ins_h = s->window[s->strstart]; 15279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]); 15289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#if MIN_MATCH != 3 15299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Call UPDATE_HASH() MIN_MATCH-3 more times 15309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 15319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not 15329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * matter since it will be recomputed at next deflate call. 15339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 15359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else { 15369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* No match, output a literal byte */ 15379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart])); 15389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_lit (s, s->window[s->strstart], bflush); 15399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead--; 15409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 15419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 15429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 15439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 15449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK(s, flush == Z_FINISH); 15459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return flush == Z_FINISH ? finish_done : block_done; 15469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 15479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#ifndef FASTEST 15499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 15509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * Same as above, but achieves better compression. We use a lazy 15519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * evaluation for matches: a match is finally adopted only if there is 15529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * no better match at the next window position. 15539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_slow(s, flush) 15559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 15569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 15579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 15589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project IPos hash_head = NIL; /* head of hash chain */ 15599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int bflush; /* set if current block must be flushed */ 15609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Process the input block. */ 15629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project for (;;) { 15639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Make sure that we always have enough lookahead, except 15649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 15659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * for the next match, plus MIN_MATCH bytes to insert the 15669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * string following the next match. 15679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD) { 15699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fill_window(s); 15709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { 15719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return need_more; 15729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 15739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 15749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 15759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Insert the string window[strstart .. strstart+2] in the 15779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * dictionary, and set hash_head to the head of the hash chain: 15789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead >= MIN_MATCH) { 15809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 15819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 15829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Find the longest match, discarding those <= prev_length. 15849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->prev_length = s->match_length, s->prev_match = s->match_start; 15869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = MIN_MATCH-1; 15879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 15889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (hash_head != NIL && s->prev_length < s->max_lazy_match && 15899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart - hash_head <= MAX_DIST(s)) { 15909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* To simplify the code, we prevent matches with the string 15919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of window index 0 (in particular we have to avoid a match 15929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * of the string with itself at the start of the input file). 15939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 15949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) { 15959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = longest_match (s, hash_head); 15969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else if (s->strategy == Z_RLE && s->strstart - hash_head == 1) { 15979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = longest_match_fast (s, hash_head); 15989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 15999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* longest_match() or longest_match_fast() sets match_start */ 16009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->match_length <= 5 && (s->strategy == Z_FILTERED 16029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#if TOO_FAR <= 32767 16039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project || (s->match_length == MIN_MATCH && 16049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart - s->match_start > TOO_FAR) 16059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 16069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project )) { 16079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If prev_match is also MIN_MATCH, match_start is garbage 16099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * but we will ignore the current match anyway. 16109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = MIN_MATCH-1; 16129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If there was a match at the previous step and the current 16159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * match is not better, output the previous match: 16169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) { 16189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt max_insert = s->strstart + s->lookahead - MIN_MATCH; 16199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Do not insert strings in hash table beyond this. */ 16209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project check_match(s, s->strstart-1, s->prev_match, s->prev_length); 16229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_dist(s, s->strstart -1 - s->prev_match, 16249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->prev_length - MIN_MATCH, bflush); 16259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Insert in hash table all strings up to the end of the match. 16279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * strstart-1 and strstart are already inserted. If there is not 16289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * enough lookahead, the last two strings are not inserted in 16299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the hash table. 16309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead -= s->prev_length-1; 16329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->prev_length -= 2; 16339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 16349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (++s->strstart <= max_insert) { 16359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project INSERT_STRING(s, s->strstart, hash_head); 16369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (--s->prev_length != 0); 16389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_available = 0; 16399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_length = MIN_MATCH-1; 16409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 16419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 16439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else if (s->match_available) { 16459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* If there was no match at the previous position, output a 16469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * single literal. If there was a match but the current match 16479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * is longer, truncate the previous match to a single literal. 16489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart-1])); 16509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_lit(s, s->window[s->strstart-1], bflush); 16519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bflush) { 16529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK_ONLY(s, 0); 16539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 16559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead--; 16569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strm->avail_out == 0) return need_more; 16579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else { 16589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* There is no previous match to compare with, wait for 16599e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * the next step to decide. 16609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_available = 1; 16629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 16639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead--; 16649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Assert (flush != Z_NO_FLUSH, "no flush?"); 16679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->match_available) { 16689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart-1])); 16699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_lit(s, s->window[s->strstart-1], bflush); 16709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->match_available = 0; 16719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 16729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK(s, flush == Z_FINISH); 16739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return flush == Z_FINISH ? finish_done : block_done; 16749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 16759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif /* FASTEST */ 16769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#if 0 16789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project/* =========================================================================== 16799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * For Z_RLE, simply look for runs of bytes, generate matches only of distance 16809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * one. Do not maintain a hash table. (It will be regenerated if this run of 16819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * deflate switches away from Z_RLE.) 16829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectlocal block_state deflate_rle(s, flush) 16849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflate_state *s; 16859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int flush; 16869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 16879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int bflush; /* set if current block must be flushed */ 16889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt run; /* length of run */ 16899e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt max; /* maximum length of run */ 16909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project uInt prev; /* byte at distance one to match */ 16919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Bytef *scan; /* scan for end of run */ 16929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 16939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project for (;;) { 16949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Make sure that we always have enough lookahead, except 16959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * at the end of the input file. We need MAX_MATCH bytes 16969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project * for the longest encodable run. 16979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project */ 16989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MAX_MATCH) { 16999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project fill_window(s); 17009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead < MAX_MATCH && flush == Z_NO_FLUSH) { 17019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return need_more; 17029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->lookahead == 0) break; /* flush the current block */ 17049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* See how many times the previous byte repeats */ 17079e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project run = 0; 17089e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (s->strstart > 0) { /* if there is a previous byte, that is */ 17099e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project max = s->lookahead < MAX_MATCH ? s->lookahead : MAX_MATCH; 17109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project scan = s->window + s->strstart - 1; 17119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project prev = *scan++; 17129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project do { 17139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (*scan++ != prev) 17149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project break; 17159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } while (++run < max); 17169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 17189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* Emit match if have run of MIN_MATCH or longer, else emit literal */ 17199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (run >= MIN_MATCH) { 17209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project check_match(s, s->strstart, s->strstart - 1, run); 17219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_dist(s, 1, run - MIN_MATCH, bflush); 17229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead -= run; 17239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart += run; 17249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } else { 17259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /* No match, output a literal byte */ 17269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project Tracevv((stderr,"%c", s->window[s->strstart])); 17279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project _tr_tally_lit (s, s->window[s->strstart], bflush); 17289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->lookahead--; 17299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project s->strstart++; 17309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (bflush) FLUSH_BLOCK(s, 0); 17329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 17339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project FLUSH_BLOCK(s, flush == Z_FINISH); 17349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project return flush == Z_FINISH ? finish_done : block_done; 17359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 17369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project#endif 1737