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annotate zlib/deflate.h @ 144:8f4e72ab4e11

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fix segmentation fault caused by nothing next cur_op to end
author Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
date Sun, 23 Dec 2018 21:23:56 +0900
parents 04ced10e8804
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* deflate.h -- internal compression state
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2 * Copyright (C) 1995-2016 Jean-loup Gailly
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3 * For conditions of distribution and use, see copyright notice in zlib.h
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4 */
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5
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6 /* WARNING: this file should *not* be used by applications. It is
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7 part of the implementation of the compression library and is
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8 subject to change. Applications should only use zlib.h.
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9 */
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10
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11 /* @(#) $Id: deflate.h,v 1.1.1.2 2002/03/11 21:53:23 tromey Exp $ */
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12
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13 #ifndef DEFLATE_H
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14 #define DEFLATE_H
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15
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16 #include "zutil.h"
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17
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18 /* define NO_GZIP when compiling if you want to disable gzip header and
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19 trailer creation by deflate(). NO_GZIP would be used to avoid linking in
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20 the crc code when it is not needed. For shared libraries, gzip encoding
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21 should be left enabled. */
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22 #ifndef NO_GZIP
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23 # define GZIP
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24 #endif
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25
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26 /* ===========================================================================
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27 * Internal compression state.
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28 */
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29
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30 #define LENGTH_CODES 29
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31 /* number of length codes, not counting the special END_BLOCK code */
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32
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33 #define LITERALS 256
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34 /* number of literal bytes 0..255 */
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35
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36 #define L_CODES (LITERALS+1+LENGTH_CODES)
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37 /* number of Literal or Length codes, including the END_BLOCK code */
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38
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39 #define D_CODES 30
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40 /* number of distance codes */
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41
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42 #define BL_CODES 19
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43 /* number of codes used to transfer the bit lengths */
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44
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45 #define HEAP_SIZE (2*L_CODES+1)
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46 /* maximum heap size */
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47
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48 #define MAX_BITS 15
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49 /* All codes must not exceed MAX_BITS bits */
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50
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51 #define Buf_size 16
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52 /* size of bit buffer in bi_buf */
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53
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54 #define INIT_STATE 42 /* zlib header -> BUSY_STATE */
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55 #ifdef GZIP
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56 # define GZIP_STATE 57 /* gzip header -> BUSY_STATE | EXTRA_STATE */
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57 #endif
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58 #define EXTRA_STATE 69 /* gzip extra block -> NAME_STATE */
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59 #define NAME_STATE 73 /* gzip file name -> COMMENT_STATE */
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60 #define COMMENT_STATE 91 /* gzip comment -> HCRC_STATE */
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61 #define HCRC_STATE 103 /* gzip header CRC -> BUSY_STATE */
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62 #define BUSY_STATE 113 /* deflate -> FINISH_STATE */
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63 #define FINISH_STATE 666 /* stream complete */
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64 /* Stream status */
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65
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66
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67 /* Data structure describing a single value and its code string. */
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68 typedef struct ct_data_s {
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69 union {
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70 ush freq; /* frequency count */
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71 ush code; /* bit string */
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72 } fc;
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73 union {
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74 ush dad; /* father node in Huffman tree */
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75 ush len; /* length of bit string */
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76 } dl;
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77 } FAR ct_data;
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78
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79 #define Freq fc.freq
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80 #define Code fc.code
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81 #define Dad dl.dad
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82 #define Len dl.len
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83
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84 typedef struct static_tree_desc_s static_tree_desc;
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85
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86 typedef struct tree_desc_s {
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87 ct_data *dyn_tree; /* the dynamic tree */
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88 int max_code; /* largest code with non zero frequency */
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89 const static_tree_desc *stat_desc; /* the corresponding static tree */
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90 } FAR tree_desc;
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91
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92 typedef ush Pos;
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93 typedef Pos FAR Posf;
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94 typedef unsigned IPos;
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95
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96 /* A Pos is an index in the character window. We use short instead of int to
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97 * save space in the various tables. IPos is used only for parameter passing.
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98 */
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99
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100 typedef struct internal_state {
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101 z_streamp strm; /* pointer back to this zlib stream */
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102 int status; /* as the name implies */
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103 Bytef *pending_buf; /* output still pending */
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104 ulg pending_buf_size; /* size of pending_buf */
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105 Bytef *pending_out; /* next pending byte to output to the stream */
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106 ulg pending; /* nb of bytes in the pending buffer */
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107 int wrap; /* bit 0 true for zlib, bit 1 true for gzip */
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108 gz_headerp gzhead; /* gzip header information to write */
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109 ulg gzindex; /* where in extra, name, or comment */
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110 Byte method; /* can only be DEFLATED */
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111 int last_flush; /* value of flush param for previous deflate call */
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112
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113 /* used by deflate.c: */
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114
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115 uInt w_size; /* LZ77 window size (32K by default) */
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116 uInt w_bits; /* log2(w_size) (8..16) */
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117 uInt w_mask; /* w_size - 1 */
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118
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119 Bytef *window;
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120 /* Sliding window. Input bytes are read into the second half of the window,
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121 * and move to the first half later to keep a dictionary of at least wSize
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122 * bytes. With this organization, matches are limited to a distance of
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123 * wSize-MAX_MATCH bytes, but this ensures that IO is always
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124 * performed with a length multiple of the block size. Also, it limits
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125 * the window size to 64K, which is quite useful on MSDOS.
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126 * To do: use the user input buffer as sliding window.
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127 */
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128
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129 ulg window_size;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 /* Actual size of window: 2*wSize, except when the user input buffer
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
131 * is directly used as sliding window.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
133
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
134 Posf *prev;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 /* Link to older string with same hash index. To limit the size of this
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
136 * array to 64K, this link is maintained only for the last 32K strings.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 * An index in this array is thus a window index modulo 32K.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
138 */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
139
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 Posf *head; /* Heads of the hash chains or NIL. */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
141
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 uInt ins_h; /* hash index of string to be inserted */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 uInt hash_size; /* number of elements in hash table */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 uInt hash_bits; /* log2(hash_size) */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 uInt hash_mask; /* hash_size-1 */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
146
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 uInt hash_shift;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 /* Number of bits by which ins_h must be shifted at each input
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
149 * step. It must be such that after MIN_MATCH steps, the oldest
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 * byte no longer takes part in the hash key, that is:
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 * hash_shift * MIN_MATCH >= hash_bits
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
153
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 long block_start;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 /* Window position at the beginning of the current output block. Gets
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 * negative when the window is moved backwards.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
158
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 uInt match_length; /* length of best match */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 IPos prev_match; /* previous match */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 int match_available; /* set if previous match exists */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 uInt strstart; /* start of string to insert */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
163 uInt match_start; /* start of matching string */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 uInt lookahead; /* number of valid bytes ahead in window */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
165
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
166 uInt prev_length;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 /* Length of the best match at previous step. Matches not greater than this
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
168 * are discarded. This is used in the lazy match evaluation.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
170
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 uInt max_chain_length;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 /* To speed up deflation, hash chains are never searched beyond this
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 * length. A higher limit improves compression ratio but degrades the
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
174 * speed.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
176
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 uInt max_lazy_match;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 /* Attempt to find a better match only when the current match is strictly
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
179 * smaller than this value. This mechanism is used only for compression
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
180 * levels >= 4.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
181 */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 # define max_insert_length max_lazy_match
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 /* Insert new strings in the hash table only if the match length is not
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 * greater than this length. This saves time but degrades compression.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 * max_insert_length is used only for compression levels <= 3.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
187
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 int level; /* compression level (1..9) */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 int strategy; /* favor or force Huffman coding*/
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
190
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 uInt good_match;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
192 /* Use a faster search when the previous match is longer than this */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
193
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 int nice_match; /* Stop searching when current match exceeds this */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
195
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
196 /* used by trees.c: */
111
kono
parents: 51
diff changeset
197 /* Didn't use ct_data typedef below to suppress compiler warning */
51
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
198 struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
199 struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
200 struct ct_data_s bl_tree[2*BL_CODES+1]; /* Huffman tree for bit lengths */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
201
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 struct tree_desc_s l_desc; /* desc. for literal tree */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 struct tree_desc_s d_desc; /* desc. for distance tree */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 struct tree_desc_s bl_desc; /* desc. for bit length tree */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
205
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 ush bl_count[MAX_BITS+1];
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 /* number of codes at each bit length for an optimal tree */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
208
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
209 int heap[2*L_CODES+1]; /* heap used to build the Huffman trees */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 int heap_len; /* number of elements in the heap */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 int heap_max; /* element of largest frequency */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 * The same heap array is used to build all trees.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
215
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
216 uch depth[2*L_CODES+1];
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 /* Depth of each subtree used as tie breaker for trees of equal frequency
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
218 */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
219
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
220 uchf *l_buf; /* buffer for literals or lengths */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
221
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
222 uInt lit_bufsize;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 /* Size of match buffer for literals/lengths. There are 4 reasons for
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 * limiting lit_bufsize to 64K:
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 * - frequencies can be kept in 16 bit counters
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 * - if compression is not successful for the first block, all input
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
227 * data is still in the window so we can still emit a stored block even
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
228 * when input comes from standard input. (This can also be done for
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
229 * all blocks if lit_bufsize is not greater than 32K.)
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
230 * - if compression is not successful for a file smaller than 64K, we can
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 * even emit a stored file instead of a stored block (saving 5 bytes).
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
232 * This is applicable only for zip (not gzip or zlib).
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
233 * - creating new Huffman trees less frequently may not provide fast
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
234 * adaptation to changes in the input data statistics. (Take for
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 * example a binary file with poorly compressible code followed by
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
236 * a highly compressible string table.) Smaller buffer sizes give
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
237 * fast adaptation but have of course the overhead of transmitting
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 * trees more frequently.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 * - I can't count above 4
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
241
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 uInt last_lit; /* running index in l_buf */
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
243
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 ushf *d_buf;
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 /* Buffer for distances. To simplify the code, d_buf and l_buf have
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
246 * the same number of elements. To use different lengths, an extra flag
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
247 * array would be necessary.
ae3a4bfb450b add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 */
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249
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250 ulg opt_len; /* bit length of current block with optimal trees */
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251 ulg static_len; /* bit length of current block with static trees */
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252 uInt matches; /* number of string matches in current block */
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253 uInt insert; /* bytes at end of window left to insert */
51
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254
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255 #ifdef ZLIB_DEBUG
51
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256 ulg compressed_len; /* total bit length of compressed file mod 2^32 */
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257 ulg bits_sent; /* bit length of compressed data sent mod 2^32 */
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258 #endif
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259
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260 ush bi_buf;
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261 /* Output buffer. bits are inserted starting at the bottom (least
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262 * significant bits).
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263 */
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264 int bi_valid;
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265 /* Number of valid bits in bi_buf. All bits above the last valid bit
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266 * are always zero.
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267 */
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268
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269 ulg high_water;
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270 /* High water mark offset in window for initialized bytes -- bytes above
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271 * this are set to zero in order to avoid memory check warnings when
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272 * longest match routines access bytes past the input. This is then
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273 * updated to the new high water mark.
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274 */
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275
51
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276 } FAR deflate_state;
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277
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278 /* Output a byte on the stream.
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279 * IN assertion: there is enough room in pending_buf.
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280 */
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281 #define put_byte(s, c) {s->pending_buf[s->pending++] = (Bytef)(c);}
51
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282
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283
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284 #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
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285 /* Minimum amount of lookahead, except at the end of the input file.
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286 * See deflate.c for comments about the MIN_MATCH+1.
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287 */
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288
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289 #define MAX_DIST(s) ((s)->w_size-MIN_LOOKAHEAD)
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290 /* In order to simplify the code, particularly on 16 bit machines, match
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291 * distances are limited to MAX_DIST instead of WSIZE.
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292 */
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293
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294 #define WIN_INIT MAX_MATCH
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295 /* Number of bytes after end of data in window to initialize in order to avoid
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296 memory checker errors from longest match routines */
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297
51
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298 /* in trees.c */
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299 void ZLIB_INTERNAL _tr_init OF((deflate_state *s));
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300 int ZLIB_INTERNAL _tr_tally OF((deflate_state *s, unsigned dist, unsigned lc));
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301 void ZLIB_INTERNAL _tr_flush_block OF((deflate_state *s, charf *buf,
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302 ulg stored_len, int last));
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303 void ZLIB_INTERNAL _tr_flush_bits OF((deflate_state *s));
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304 void ZLIB_INTERNAL _tr_align OF((deflate_state *s));
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305 void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
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306 ulg stored_len, int last));
51
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307
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308 #define d_code(dist) \
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309 ((dist) < 256 ? _dist_code[dist] : _dist_code[256+((dist)>>7)])
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310 /* Mapping from a distance to a distance code. dist is the distance - 1 and
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311 * must not have side effects. _dist_code[256] and _dist_code[257] are never
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312 * used.
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313 */
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314
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315 #ifndef ZLIB_DEBUG
51
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316 /* Inline versions of _tr_tally for speed: */
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317
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318 #if defined(GEN_TREES_H) || !defined(STDC)
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319 extern uch ZLIB_INTERNAL _length_code[];
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320 extern uch ZLIB_INTERNAL _dist_code[];
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321 #else
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322 extern const uch ZLIB_INTERNAL _length_code[];
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323 extern const uch ZLIB_INTERNAL _dist_code[];
51
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324 #endif
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325
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326 # define _tr_tally_lit(s, c, flush) \
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327 { uch cc = (c); \
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328 s->d_buf[s->last_lit] = 0; \
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329 s->l_buf[s->last_lit++] = cc; \
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330 s->dyn_ltree[cc].Freq++; \
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331 flush = (s->last_lit == s->lit_bufsize-1); \
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332 }
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333 # define _tr_tally_dist(s, distance, length, flush) \
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334 { uch len = (uch)(length); \
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335 ush dist = (ush)(distance); \
51
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336 s->d_buf[s->last_lit] = dist; \
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337 s->l_buf[s->last_lit++] = len; \
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338 dist--; \
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339 s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
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340 s->dyn_dtree[d_code(dist)].Freq++; \
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341 flush = (s->last_lit == s->lit_bufsize-1); \
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342 }
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343 #else
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344 # define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c)
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345 # define _tr_tally_dist(s, distance, length, flush) \
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346 flush = _tr_tally(s, distance, length)
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347 #endif
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348
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349 #endif /* DEFLATE_H */