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Diffstat (limited to 'utils/zenutils/libraries/zlib123/zlib/deflate.h')
-rwxr-xr-x | utils/zenutils/libraries/zlib123/zlib/deflate.h | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/utils/zenutils/libraries/zlib123/zlib/deflate.h b/utils/zenutils/libraries/zlib123/zlib/deflate.h new file mode 100755 index 0000000000..222c53e043 --- /dev/null +++ b/utils/zenutils/libraries/zlib123/zlib/deflate.h | |||
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1 | /* deflate.h -- internal compression state | ||
2 | * Copyright (C) 1995-2004 Jean-loup Gailly | ||
3 | * For conditions of distribution and use, see copyright notice in zlib.h | ||
4 | */ | ||
5 | |||
6 | /* WARNING: this file should *not* be used by applications. It is | ||
7 | part of the implementation of the compression library and is | ||
8 | subject to change. Applications should only use zlib.h. | ||
9 | */ | ||
10 | |||
11 | /* @(#) $Id$ */ | ||
12 | |||
13 | #ifndef DEFLATE_H | ||
14 | #define DEFLATE_H | ||
15 | |||
16 | #include "zutil.h" | ||
17 | |||
18 | /* define NO_GZIP when compiling if you want to disable gzip header and | ||
19 | trailer creation by deflate(). NO_GZIP would be used to avoid linking in | ||
20 | the crc code when it is not needed. For shared libraries, gzip encoding | ||
21 | should be left enabled. */ | ||
22 | #ifndef NO_GZIP | ||
23 | # define GZIP | ||
24 | #endif | ||
25 | |||
26 | /* =========================================================================== | ||
27 | * Internal compression state. | ||
28 | */ | ||
29 | |||
30 | #define LENGTH_CODES 29 | ||
31 | /* number of length codes, not counting the special END_BLOCK code */ | ||
32 | |||
33 | #define LITERALS 256 | ||
34 | /* number of literal bytes 0..255 */ | ||
35 | |||
36 | #define L_CODES (LITERALS+1+LENGTH_CODES) | ||
37 | /* number of Literal or Length codes, including the END_BLOCK code */ | ||
38 | |||
39 | #define D_CODES 30 | ||
40 | /* number of distance codes */ | ||
41 | |||
42 | #define BL_CODES 19 | ||
43 | /* number of codes used to transfer the bit lengths */ | ||
44 | |||
45 | #define HEAP_SIZE (2*L_CODES+1) | ||
46 | /* maximum heap size */ | ||
47 | |||
48 | #define MAX_BITS 15 | ||
49 | /* All codes must not exceed MAX_BITS bits */ | ||
50 | |||
51 | #define INIT_STATE 42 | ||
52 | #define EXTRA_STATE 69 | ||
53 | #define NAME_STATE 73 | ||
54 | #define COMMENT_STATE 91 | ||
55 | #define HCRC_STATE 103 | ||
56 | #define BUSY_STATE 113 | ||
57 | #define FINISH_STATE 666 | ||
58 | /* Stream status */ | ||
59 | |||
60 | |||
61 | /* Data structure describing a single value and its code string. */ | ||
62 | typedef struct ct_data_s { | ||
63 | union { | ||
64 | ush freq; /* frequency count */ | ||
65 | ush code; /* bit string */ | ||
66 | } fc; | ||
67 | union { | ||
68 | ush dad; /* father node in Huffman tree */ | ||
69 | ush len; /* length of bit string */ | ||
70 | } dl; | ||
71 | } FAR ct_data; | ||
72 | |||
73 | #define Freq fc.freq | ||
74 | #define Code fc.code | ||
75 | #define Dad dl.dad | ||
76 | #define Len dl.len | ||
77 | |||
78 | typedef struct static_tree_desc_s static_tree_desc; | ||
79 | |||
80 | typedef struct tree_desc_s { | ||
81 | ct_data *dyn_tree; /* the dynamic tree */ | ||
82 | int max_code; /* largest code with non zero frequency */ | ||
83 | static_tree_desc *stat_desc; /* the corresponding static tree */ | ||
84 | } FAR tree_desc; | ||
85 | |||
86 | typedef ush Pos; | ||
87 | typedef Pos FAR Posf; | ||
88 | typedef unsigned IPos; | ||
89 | |||
90 | /* A Pos is an index in the character window. We use short instead of int to | ||
91 | * save space in the various tables. IPos is used only for parameter passing. | ||
92 | */ | ||
93 | |||
94 | typedef struct internal_state { | ||
95 | z_streamp strm; /* pointer back to this zlib stream */ | ||
96 | int status; /* as the name implies */ | ||
97 | Bytef *pending_buf; /* output still pending */ | ||
98 | ulg pending_buf_size; /* size of pending_buf */ | ||
99 | Bytef *pending_out; /* next pending byte to output to the stream */ | ||
100 | uInt pending; /* nb of bytes in the pending buffer */ | ||
101 | int wrap; /* bit 0 true for zlib, bit 1 true for gzip */ | ||
102 | gz_headerp gzhead; /* gzip header information to write */ | ||
103 | uInt gzindex; /* where in extra, name, or comment */ | ||
104 | Byte method; /* STORED (for zip only) or DEFLATED */ | ||
105 | int last_flush; /* value of flush param for previous deflate call */ | ||
106 | |||
107 | /* used by deflate.c: */ | ||
108 | |||
109 | uInt w_size; /* LZ77 window size (32K by default) */ | ||
110 | uInt w_bits; /* log2(w_size) (8..16) */ | ||
111 | uInt w_mask; /* w_size - 1 */ | ||
112 | |||
113 | Bytef *window; | ||
114 | /* Sliding window. Input bytes are read into the second half of the window, | ||
115 | * and move to the first half later to keep a dictionary of at least wSize | ||
116 | * bytes. With this organization, matches are limited to a distance of | ||
117 | * wSize-MAX_MATCH bytes, but this ensures that IO is always | ||
118 | * performed with a length multiple of the block size. Also, it limits | ||
119 | * the window size to 64K, which is quite useful on MSDOS. | ||
120 | * To do: use the user input buffer as sliding window. | ||
121 | */ | ||
122 | |||
123 | ulg window_size; | ||
124 | /* Actual size of window: 2*wSize, except when the user input buffer | ||
125 | * is directly used as sliding window. | ||
126 | */ | ||
127 | |||
128 | Posf *prev; | ||
129 | /* Link to older string with same hash index. To limit the size of this | ||
130 | * array to 64K, this link is maintained only for the last 32K strings. | ||
131 | * An index in this array is thus a window index modulo 32K. | ||
132 | */ | ||
133 | |||
134 | Posf *head; /* Heads of the hash chains or NIL. */ | ||
135 | |||
136 | uInt ins_h; /* hash index of string to be inserted */ | ||
137 | uInt hash_size; /* number of elements in hash table */ | ||
138 | uInt hash_bits; /* log2(hash_size) */ | ||
139 | uInt hash_mask; /* hash_size-1 */ | ||
140 | |||
141 | uInt hash_shift; | ||
142 | /* Number of bits by which ins_h must be shifted at each input | ||
143 | * step. It must be such that after MIN_MATCH steps, the oldest | ||
144 | * byte no longer takes part in the hash key, that is: | ||
145 | * hash_shift * MIN_MATCH >= hash_bits | ||
146 | */ | ||
147 | |||
148 | long block_start; | ||
149 | /* Window position at the beginning of the current output block. Gets | ||
150 | * negative when the window is moved backwards. | ||
151 | */ | ||
152 | |||
153 | uInt match_length; /* length of best match */ | ||
154 | IPos prev_match; /* previous match */ | ||
155 | int match_available; /* set if previous match exists */ | ||
156 | uInt strstart; /* start of string to insert */ | ||
157 | uInt match_start; /* start of matching string */ | ||
158 | uInt lookahead; /* number of valid bytes ahead in window */ | ||
159 | |||
160 | uInt prev_length; | ||
161 | /* Length of the best match at previous step. Matches not greater than this | ||
162 | * are discarded. This is used in the lazy match evaluation. | ||
163 | */ | ||
164 | |||
165 | uInt max_chain_length; | ||
166 | /* To speed up deflation, hash chains are never searched beyond this | ||
167 | * length. A higher limit improves compression ratio but degrades the | ||
168 | * speed. | ||
169 | */ | ||
170 | |||
171 | uInt max_lazy_match; | ||
172 | /* Attempt to find a better match only when the current match is strictly | ||
173 | * smaller than this value. This mechanism is used only for compression | ||
174 | * levels >= 4. | ||
175 | */ | ||
176 | # define max_insert_length max_lazy_match | ||
177 | /* Insert new strings in the hash table only if the match length is not | ||
178 | * greater than this length. This saves time but degrades compression. | ||
179 | * max_insert_length is used only for compression levels <= 3. | ||
180 | */ | ||
181 | |||
182 | int level; /* compression level (1..9) */ | ||
183 | int strategy; /* favor or force Huffman coding*/ | ||
184 | |||
185 | uInt good_match; | ||
186 | /* Use a faster search when the previous match is longer than this */ | ||
187 | |||
188 | int nice_match; /* Stop searching when current match exceeds this */ | ||
189 | |||
190 | /* used by trees.c: */ | ||
191 | /* Didn't use ct_data typedef below to supress compiler warning */ | ||
192 | struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */ | ||
193 | struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */ | ||
194 | struct ct_data_s bl_tree[2*BL_CODES+1]; /* Huffman tree for bit lengths */ | ||
195 | |||
196 | struct tree_desc_s l_desc; /* desc. for literal tree */ | ||
197 | struct tree_desc_s d_desc; /* desc. for distance tree */ | ||
198 | struct tree_desc_s bl_desc; /* desc. for bit length tree */ | ||
199 | |||
200 | ush bl_count[MAX_BITS+1]; | ||
201 | /* number of codes at each bit length for an optimal tree */ | ||
202 | |||
203 | int heap[2*L_CODES+1]; /* heap used to build the Huffman trees */ | ||
204 | int heap_len; /* number of elements in the heap */ | ||
205 | int heap_max; /* element of largest frequency */ | ||
206 | /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used. | ||
207 | * The same heap array is used to build all trees. | ||
208 | */ | ||
209 | |||
210 | uch depth[2*L_CODES+1]; | ||
211 | /* Depth of each subtree used as tie breaker for trees of equal frequency | ||
212 | */ | ||
213 | |||
214 | uchf *l_buf; /* buffer for literals or lengths */ | ||
215 | |||
216 | uInt lit_bufsize; | ||
217 | /* Size of match buffer for literals/lengths. There are 4 reasons for | ||
218 | * limiting lit_bufsize to 64K: | ||
219 | * - frequencies can be kept in 16 bit counters | ||
220 | * - if compression is not successful for the first block, all input | ||
221 | * data is still in the window so we can still emit a stored block even | ||
222 | * when input comes from standard input. (This can also be done for | ||
223 | * all blocks if lit_bufsize is not greater than 32K.) | ||
224 | * - if compression is not successful for a file smaller than 64K, we can | ||
225 | * even emit a stored file instead of a stored block (saving 5 bytes). | ||
226 | * This is applicable only for zip (not gzip or zlib). | ||
227 | * - creating new Huffman trees less frequently may not provide fast | ||
228 | * adaptation to changes in the input data statistics. (Take for | ||
229 | * example a binary file with poorly compressible code followed by | ||
230 | * a highly compressible string table.) Smaller buffer sizes give | ||
231 | * fast adaptation but have of course the overhead of transmitting | ||
232 | * trees more frequently. | ||
233 | * - I can't count above 4 | ||
234 | */ | ||
235 | |||
236 | uInt last_lit; /* running index in l_buf */ | ||
237 | |||
238 | ushf *d_buf; | ||
239 | /* Buffer for distances. To simplify the code, d_buf and l_buf have | ||
240 | * the same number of elements. To use different lengths, an extra flag | ||
241 | * array would be necessary. | ||
242 | */ | ||
243 | |||
244 | ulg opt_len; /* bit length of current block with optimal trees */ | ||
245 | ulg static_len; /* bit length of current block with static trees */ | ||
246 | uInt matches; /* number of string matches in current block */ | ||
247 | int last_eob_len; /* bit length of EOB code for last block */ | ||
248 | |||
249 | #ifdef DEBUG | ||
250 | ulg compressed_len; /* total bit length of compressed file mod 2^32 */ | ||
251 | ulg bits_sent; /* bit length of compressed data sent mod 2^32 */ | ||
252 | #endif | ||
253 | |||
254 | ush bi_buf; | ||
255 | /* Output buffer. bits are inserted starting at the bottom (least | ||
256 | * significant bits). | ||
257 | */ | ||
258 | int bi_valid; | ||
259 | /* Number of valid bits in bi_buf. All bits above the last valid bit | ||
260 | * are always zero. | ||
261 | */ | ||
262 | |||
263 | } FAR deflate_state; | ||
264 | |||
265 | /* Output a byte on the stream. | ||
266 | * IN assertion: there is enough room in pending_buf. | ||
267 | */ | ||
268 | #define put_byte(s, c) {s->pending_buf[s->pending++] = (c);} | ||
269 | |||
270 | |||
271 | #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1) | ||
272 | /* Minimum amount of lookahead, except at the end of the input file. | ||
273 | * See deflate.c for comments about the MIN_MATCH+1. | ||
274 | */ | ||
275 | |||
276 | #define MAX_DIST(s) ((s)->w_size-MIN_LOOKAHEAD) | ||
277 | /* In order to simplify the code, particularly on 16 bit machines, match | ||
278 | * distances are limited to MAX_DIST instead of WSIZE. | ||
279 | */ | ||
280 | |||
281 | /* in trees.c */ | ||
282 | void _tr_init OF((deflate_state *s)); | ||
283 | int _tr_tally OF((deflate_state *s, unsigned dist, unsigned lc)); | ||
284 | void _tr_flush_block OF((deflate_state *s, charf *buf, ulg stored_len, | ||
285 | int eof)); | ||
286 | void _tr_align OF((deflate_state *s)); | ||
287 | void _tr_stored_block OF((deflate_state *s, charf *buf, ulg stored_len, | ||
288 | int eof)); | ||
289 | |||
290 | #define d_code(dist) \ | ||
291 | ((dist) < 256 ? _dist_code[dist] : _dist_code[256+((dist)>>7)]) | ||
292 | /* Mapping from a distance to a distance code. dist is the distance - 1 and | ||
293 | * must not have side effects. _dist_code[256] and _dist_code[257] are never | ||
294 | * used. | ||
295 | */ | ||
296 | |||
297 | #ifndef DEBUG | ||
298 | /* Inline versions of _tr_tally for speed: */ | ||
299 | |||
300 | #if defined(GEN_TREES_H) || !defined(STDC) | ||
301 | extern uch _length_code[]; | ||
302 | extern uch _dist_code[]; | ||
303 | #else | ||
304 | extern const uch _length_code[]; | ||
305 | extern const uch _dist_code[]; | ||
306 | #endif | ||
307 | |||
308 | # define _tr_tally_lit(s, c, flush) \ | ||
309 | { uch cc = (c); \ | ||
310 | s->d_buf[s->last_lit] = 0; \ | ||
311 | s->l_buf[s->last_lit++] = cc; \ | ||
312 | s->dyn_ltree[cc].Freq++; \ | ||
313 | flush = (s->last_lit == s->lit_bufsize-1); \ | ||
314 | } | ||
315 | # define _tr_tally_dist(s, distance, length, flush) \ | ||
316 | { uch len = (length); \ | ||
317 | ush dist = (distance); \ | ||
318 | s->d_buf[s->last_lit] = dist; \ | ||
319 | s->l_buf[s->last_lit++] = len; \ | ||
320 | dist--; \ | ||
321 | s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \ | ||
322 | s->dyn_dtree[d_code(dist)].Freq++; \ | ||
323 | flush = (s->last_lit == s->lit_bufsize-1); \ | ||
324 | } | ||
325 | #else | ||
326 | # define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c) | ||
327 | # define _tr_tally_dist(s, distance, length, flush) \ | ||
328 | flush = _tr_tally(s, distance, length) | ||
329 | #endif | ||
330 | |||
331 | #endif /* DEFLATE_H */ | ||