[pcsx_rearmed.git] / deps / libchdr / deps / zlib-1.2.11 / deflate.h

/* deflate.h -- internal compression state
 * Copyright (C) 1995-2016 Jean-loup Gailly
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* WARNING: this file should *not* be used by applications. It is
   part of the implementation of the compression library and is
   subject to change. Applications should only use zlib.h.
 */

/* @(#) $Id$ */

#ifndef DEFLATE_H
#define DEFLATE_H

#include "zutil.h"

/* define NO_GZIP when compiling if you want to disable gzip header and
   trailer creation by deflate().  NO_GZIP would be used to avoid linking in
   the crc code when it is not needed.  For shared libraries, gzip encoding
   should be left enabled. */
#ifndef NO_GZIP
#  define GZIP
#endif

/* ===========================================================================
 * Internal compression state.
 */

#define LENGTH_CODES 29
/* number of length codes, not counting the special END_BLOCK code */

#define LITERALS  256
/* number of literal bytes 0..255 */

#define L_CODES (LITERALS+1+LENGTH_CODES)
/* number of Literal or Length codes, including the END_BLOCK code */

#define D_CODES   30
/* number of distance codes */

#define BL_CODES  19
/* number of codes used to transfer the bit lengths */

#define HEAP_SIZE (2*L_CODES+1)
/* maximum heap size */

#define MAX_BITS 15
/* All codes must not exceed MAX_BITS bits */

#define Buf_size 16
/* size of bit buffer in bi_buf */

#define INIT_STATE    42    /* zlib header -> BUSY_STATE */
#ifdef GZIP
#  define GZIP_STATE  57    /* gzip header -> BUSY_STATE | EXTRA_STATE */
#endif
#define EXTRA_STATE   69    /* gzip extra block -> NAME_STATE */
#define NAME_STATE    73    /* gzip file name -> COMMENT_STATE */
#define COMMENT_STATE 91    /* gzip comment -> HCRC_STATE */
#define HCRC_STATE   103    /* gzip header CRC -> BUSY_STATE */
#define BUSY_STATE   113    /* deflate -> FINISH_STATE */
#define FINISH_STATE 666    /* stream complete */
/* Stream status */


/* Data structure describing a single value and its code string. */
typedef struct ct_data_s {
    union {
        ush  freq;       /* frequency count */
        ush  code;       /* bit string */
    } fc;
    union {
        ush  dad;        /* father node in Huffman tree */
        ush  len;        /* length of bit string */
    } dl;
} FAR ct_data;

#define Freq fc.freq
#define Code fc.code
#define Dad  dl.dad
#define Len  dl.len

typedef struct static_tree_desc_s  static_tree_desc;

typedef struct tree_desc_s {
    ct_data *dyn_tree;           /* the dynamic tree */
    int     max_code;            /* largest code with non zero frequency */
    const static_tree_desc *stat_desc;  /* the corresponding static tree */
} FAR tree_desc;

typedef ush Pos;
typedef Pos FAR Posf;
typedef unsigned IPos;

/* A Pos is an index in the character window. We use short instead of int to
 * save space in the various tables. IPos is used only for parameter passing.
 */

typedef struct internal_state {
    z_streamp strm;      /* pointer back to this zlib stream */
    int   status;        /* as the name implies */
    Bytef *pending_buf;  /* output still pending */
    ulg   pending_buf_size; /* size of pending_buf */
    Bytef *pending_out;  /* next pending byte to output to the stream */
    ulg   pending;       /* nb of bytes in the pending buffer */
    int   wrap;          /* bit 0 true for zlib, bit 1 true for gzip */
    gz_headerp  gzhead;  /* gzip header information to write */
    ulg   gzindex;       /* where in extra, name, or comment */
    Byte  method;        /* can only be DEFLATED */
    int   last_flush;    /* value of flush param for previous deflate call */

                /* used by deflate.c: */

    uInt  w_size;        /* LZ77 window size (32K by default) */
    uInt  w_bits;        /* log2(w_size)  (8..16) */
    uInt  w_mask;        /* w_size - 1 */

    Bytef *window;
    /* Sliding window. Input bytes are read into the second half of the window,
     * and move to the first half later to keep a dictionary of at least wSize
     * bytes. With this organization, matches are limited to a distance of
     * wSize-MAX_MATCH bytes, but this ensures that IO is always
     * performed with a length multiple of the block size. Also, it limits
     * the window size to 64K, which is quite useful on MSDOS.
     * To do: use the user input buffer as sliding window.
     */

    ulg window_size;
    /* Actual size of window: 2*wSize, except when the user input buffer
     * is directly used as sliding window.
     */

    Posf *prev;
    /* Link to older string with same hash index. To limit the size of this
     * array to 64K, this link is maintained only for the last 32K strings.
     * An index in this array is thus a window index modulo 32K.
     */

    Posf *head; /* Heads of the hash chains or NIL. */

    uInt  ins_h;          /* hash index of string to be inserted */
    uInt  hash_size;      /* number of elements in hash table */
    uInt  hash_bits;      /* log2(hash_size) */
    uInt  hash_mask;      /* hash_size-1 */

    uInt  hash_shift;
    /* Number of bits by which ins_h must be shifted at each input
     * step. It must be such that after MIN_MATCH steps, the oldest
     * byte no longer takes part in the hash key, that is:
     *   hash_shift * MIN_MATCH >= hash_bits
     */

    long block_start;
    /* Window position at the beginning of the current output block. Gets
     * negative when the window is moved backwards.
     */

    uInt match_length;           /* length of best match */
    IPos prev_match;             /* previous match */
    int match_available;         /* set if previous match exists */
    uInt strstart;               /* start of string to insert */
    uInt match_start;            /* start of matching string */
    uInt lookahead;              /* number of valid bytes ahead in window */

    uInt prev_length;
    /* Length of the best match at previous step. Matches not greater than this
     * are discarded. This is used in the lazy match evaluation.
     */

    uInt max_chain_length;
    /* To speed up deflation, hash chains are never searched beyond this
     * length.  A higher limit improves compression ratio but degrades the
     * speed.
     */

    uInt max_lazy_match;
    /* Attempt to find a better match only when the current match is strictly
     * smaller than this value. This mechanism is used only for compression
     * levels >= 4.
     */
#   define max_insert_length  max_lazy_match
    /* Insert new strings in the hash table only if the match length is not
     * greater than this length. This saves time but degrades compression.
     * max_insert_length is used only for compression levels <= 3.
     */

    int level;    /* compression level (1..9) */
    int strategy; /* favor or force Huffman coding*/

    uInt good_match;
    /* Use a faster search when the previous match is longer than this */

    int nice_match; /* Stop searching when current match exceeds this */

                /* used by trees.c: */
    /* Didn't use ct_data typedef below to suppress compiler warning */
    struct ct_data_s dyn_ltree[HEAP_SIZE];   /* literal and length tree */
    struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
    struct ct_data_s bl_tree[2*BL_CODES+1];  /* Huffman tree for bit lengths */

    struct tree_desc_s l_desc;               /* desc. for literal tree */
    struct tree_desc_s d_desc;               /* desc. for distance tree */
    struct tree_desc_s bl_desc;              /* desc. for bit length tree */

    ush bl_count[MAX_BITS+1];
    /* number of codes at each bit length for an optimal tree */

    int heap[2*L_CODES+1];      /* heap used to build the Huffman trees */
    int heap_len;               /* number of elements in the heap */
    int heap_max;               /* element of largest frequency */
    /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
     * The same heap array is used to build all trees.
     */

    uch depth[2*L_CODES+1];
    /* Depth of each subtree used as tie breaker for trees of equal frequency
     */

    uchf *l_buf;          /* buffer for literals or lengths */

    uInt  lit_bufsize;
    /* Size of match buffer for literals/lengths.  There are 4 reasons for
     * limiting lit_bufsize to 64K:
     *   - frequencies can be kept in 16 bit counters
     *   - if compression is not successful for the first block, all input
     *     data is still in the window so we can still emit a stored block even
     *     when input comes from standard input.  (This can also be done for
     *     all blocks if lit_bufsize is not greater than 32K.)
     *   - if compression is not successful for a file smaller than 64K, we can
     *     even emit a stored file instead of a stored block (saving 5 bytes).
     *     This is applicable only for zip (not gzip or zlib).
     *   - creating new Huffman trees less frequently may not provide fast
     *     adaptation to changes in the input data statistics. (Take for
     *     example a binary file with poorly compressible code followed by
     *     a highly compressible string table.) Smaller buffer sizes give
     *     fast adaptation but have of course the overhead of transmitting
     *     trees more frequently.
     *   - I can't count above 4
     */

    uInt last_lit;      /* running index in l_buf */

    ushf *d_buf;
    /* Buffer for distances. To simplify the code, d_buf and l_buf have
     * the same number of elements. To use different lengths, an extra flag
     * array would be necessary.
     */

    ulg opt_len;        /* bit length of current block with optimal trees */
    ulg static_len;     /* bit length of current block with static trees */
    uInt matches;       /* number of string matches in current block */
    uInt insert;        /* bytes at end of window left to insert */

#ifdef ZLIB_DEBUG
    ulg compressed_len; /* total bit length of compressed file mod 2^32 */
    ulg bits_sent;      /* bit length of compressed data sent mod 2^32 */
#endif

    ush bi_buf;
    /* Output buffer. bits are inserted starting at the bottom (least
     * significant bits).
     */
    int bi_valid;
    /* Number of valid bits in bi_buf.  All bits above the last valid bit
     * are always zero.
     */

    ulg high_water;
    /* High water mark offset in window for initialized bytes -- bytes above
     * this are set to zero in order to avoid memory check warnings when
     * longest match routines access bytes past the input.  This is then
     * updated to the new high water mark.
     */

} FAR deflate_state;

/* Output a byte on the stream.
 * IN assertion: there is enough room in pending_buf.
 */
#define put_byte(s, c) {s->pending_buf[s->pending++] = (Bytef)(c);}


#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
/* Minimum amount of lookahead, except at the end of the input file.
 * See deflate.c for comments about the MIN_MATCH+1.
 */

#define MAX_DIST(s)  ((s)->w_size-MIN_LOOKAHEAD)
/* In order to simplify the code, particularly on 16 bit machines, match
 * distances are limited to MAX_DIST instead of WSIZE.
 */

#define WIN_INIT MAX_MATCH
/* Number of bytes after end of data in window to initialize in order to avoid
   memory checker errors from longest match routines */

        /* in trees.c */
void ZLIB_INTERNAL _tr_init OF((deflate_state *s));
int ZLIB_INTERNAL _tr_tally OF((deflate_state *s, unsigned dist, unsigned lc));
void ZLIB_INTERNAL _tr_flush_block OF((deflate_state *s, charf *buf,
                        ulg stored_len, int last));
void ZLIB_INTERNAL _tr_flush_bits OF((deflate_state *s));
void ZLIB_INTERNAL _tr_align OF((deflate_state *s));
void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
                        ulg stored_len, int last));

#define d_code(dist) \
   ((dist) < 256 ? _dist_code[dist] : _dist_code[256+((dist)>>7)])
/* Mapping from a distance to a distance code. dist is the distance - 1 and
 * must not have side effects. _dist_code[256] and _dist_code[257] are never
 * used.
 */

#ifndef ZLIB_DEBUG
/* Inline versions of _tr_tally for speed: */

#if defined(GEN_TREES_H) || !defined(STDC)
  extern uch ZLIB_INTERNAL _length_code[];
  extern uch ZLIB_INTERNAL _dist_code[];
#else
  extern const uch ZLIB_INTERNAL _length_code[];
  extern const uch ZLIB_INTERNAL _dist_code[];
#endif

# define _tr_tally_lit(s, c, flush) \
  { uch cc = (c); \
    s->d_buf[s->last_lit] = 0; \
    s->l_buf[s->last_lit++] = cc; \
    s->dyn_ltree[cc].Freq++; \
    flush = (s->last_lit == s->lit_bufsize-1); \
   }
# define _tr_tally_dist(s, distance, length, flush) \
  { uch len = (uch)(length); \
    ush dist = (ush)(distance); \
    s->d_buf[s->last_lit] = dist; \
    s->l_buf[s->last_lit++] = len; \
    dist--; \
    s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
    s->dyn_dtree[d_code(dist)].Freq++; \
    flush = (s->last_lit == s->lit_bufsize-1); \
  }
#else
# define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c)
# define _tr_tally_dist(s, distance, length, flush) \
              flush = _tr_tally(s, distance, length)
#endif

#endif /* DEFLATE_H */
Commit	Line	Data
b24e7fce	1	/* deflate.h -- internal compression state
	2	* Copyright (C) 1995-2016 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 Buf_size 16
	52	/* size of bit buffer in bi_buf */
	53
	54	#define INIT_STATE 42 /* zlib header -> BUSY_STATE */
	55	#ifdef GZIP
	56	# define GZIP_STATE 57 /* gzip header -> BUSY_STATE \| EXTRA_STATE */
	57	#endif
	58	#define EXTRA_STATE 69 /* gzip extra block -> NAME_STATE */
	59	#define NAME_STATE 73 /* gzip file name -> COMMENT_STATE */
	60	#define COMMENT_STATE 91 /* gzip comment -> HCRC_STATE */
	61	#define HCRC_STATE 103 /* gzip header CRC -> BUSY_STATE */
	62	#define BUSY_STATE 113 /* deflate -> FINISH_STATE */
	63	#define FINISH_STATE 666 /* stream complete */
	64	/* Stream status */
65
66
67	/* Data structure describing a single value and its code string. */
68	typedef struct ct_data_s {
69	union {
70	ush freq; /* frequency count */
71	ush code; /* bit string */
72	} fc;
73	union {
74	ush dad; /* father node in Huffman tree */
75	ush len; /* length of bit string */
76	} dl;
77	} FAR ct_data;
78
79	#define Freq fc.freq
80	#define Code fc.code
81	#define Dad dl.dad
82	#define Len dl.len
83
84	typedef struct static_tree_desc_s static_tree_desc;
85
86	typedef struct tree_desc_s {
87	ct_data dyn_tree; / the dynamic tree */
88	int max_code; /* largest code with non zero frequency */
89	const static_tree_desc stat_desc; / the corresponding static tree */
90	} FAR tree_desc;
91
92	typedef ush Pos;
93	typedef Pos FAR Posf;
94	typedef unsigned IPos;
95
96	/* A Pos is an index in the character window. We use short instead of int to
97	* save space in the various tables. IPos is used only for parameter passing.
98	*/
99
100	typedef struct internal_state {
101	z_streamp strm; /* pointer back to this zlib stream */
102	int status; /* as the name implies */
103	Bytef pending_buf; / output still pending */
104	ulg pending_buf_size; /* size of pending_buf */
105	Bytef pending_out; / next pending byte to output to the stream */
106	ulg pending; /* nb of bytes in the pending buffer */
107	int wrap; /* bit 0 true for zlib, bit 1 true for gzip */
108	gz_headerp gzhead; /* gzip header information to write */
109	ulg gzindex; /* where in extra, name, or comment */
110	Byte method; /* can only be DEFLATED */
111	int last_flush; /* value of flush param for previous deflate call */
112
113	/* used by deflate.c: */
114
115	uInt w_size; /* LZ77 window size (32K by default) */
116	uInt w_bits; /* log2(w_size) (8..16) */
117	uInt w_mask; /* w_size - 1 */
118
119	Bytef *window;
120	/* Sliding window. Input bytes are read into the second half of the window,
121	* and move to the first half later to keep a dictionary of at least wSize
122	* bytes. With this organization, matches are limited to a distance of
123	* wSize-MAX_MATCH bytes, but this ensures that IO is always
124	* performed with a length multiple of the block size. Also, it limits
125	* the window size to 64K, which is quite useful on MSDOS.
126	* To do: use the user input buffer as sliding window.
127	*/
128
129	ulg window_size;
130	/* Actual size of window: 2*wSize, except when the user input buffer
131	* is directly used as sliding window.
132	*/
133
134	Posf *prev;
135	/* Link to older string with same hash index. To limit the size of this
136	* array to 64K, this link is maintained only for the last 32K strings.
137	* An index in this array is thus a window index modulo 32K.
138	*/
139
140	Posf head; / Heads of the hash chains or NIL. */
141
142	uInt ins_h; /* hash index of string to be inserted */
143	uInt hash_size; /* number of elements in hash table */
144	uInt hash_bits; /* log2(hash_size) */
145	uInt hash_mask; /* hash_size-1 */
146
147	uInt hash_shift;
148	/* Number of bits by which ins_h must be shifted at each input
149	* step. It must be such that after MIN_MATCH steps, the oldest
150	* byte no longer takes part in the hash key, that is:
151	* hash_shift * MIN_MATCH >= hash_bits
152	*/
153
154	long block_start;
155	/* Window position at the beginning of the current output block. Gets
156	* negative when the window is moved backwards.
157	*/
158
159	uInt match_length; /* length of best match */
160	IPos prev_match; /* previous match */
161	int match_available; /* set if previous match exists */
162	uInt strstart; /* start of string to insert */
163	uInt match_start; /* start of matching string */
164	uInt lookahead; /* number of valid bytes ahead in window */
165
166	uInt prev_length;
167	/* Length of the best match at previous step. Matches not greater than this
168	* are discarded. This is used in the lazy match evaluation.
169	*/
170
171	uInt max_chain_length;
172	/* To speed up deflation, hash chains are never searched beyond this
173	* length. A higher limit improves compression ratio but degrades the
174	* speed.
175	*/
176
177	uInt max_lazy_match;
178	/* Attempt to find a better match only when the current match is strictly
179	* smaller than this value. This mechanism is used only for compression
180	* levels >= 4.
181	*/
182	# define max_insert_length max_lazy_match
183	/* Insert new strings in the hash table only if the match length is not
184	* greater than this length. This saves time but degrades compression.
185	* max_insert_length is used only for compression levels <= 3.
186	*/
187
188	int level; /* compression level (1..9) */
189	int strategy; /* favor or force Huffman coding*/
190
191	uInt good_match;
192	/* Use a faster search when the previous match is longer than this */
193
194	int nice_match; /* Stop searching when current match exceeds this */
195
196	/* used by trees.c: */
197	/* Didn't use ct_data typedef below to suppress compiler warning */
198	struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */
199	struct ct_data_s dyn_dtree[2D_CODES+1]; / distance tree */
200	struct ct_data_s bl_tree[2BL_CODES+1]; / Huffman tree for bit lengths */
201
202	struct tree_desc_s l_desc; /* desc. for literal tree */
203	struct tree_desc_s d_desc; /* desc. for distance tree */
204	struct tree_desc_s bl_desc; /* desc. for bit length tree */
205
206	ush bl_count[MAX_BITS+1];
207	/* number of codes at each bit length for an optimal tree */
208
209	int heap[2L_CODES+1]; / heap used to build the Huffman trees */
210	int heap_len; /* number of elements in the heap */
211	int heap_max; /* element of largest frequency */
212	/* The sons of heap[n] are heap[2n] and heap[2n+1]. heap[0] is not used.
213	* The same heap array is used to build all trees.
214	*/
215
216	uch depth[2*L_CODES+1];
217	/* Depth of each subtree used as tie breaker for trees of equal frequency
218	*/
219
220	uchf l_buf; / buffer for literals or lengths */
221
222	uInt lit_bufsize;
223	/* Size of match buffer for literals/lengths. There are 4 reasons for
224	* limiting lit_bufsize to 64K:
225	* - frequencies can be kept in 16 bit counters
226	* - if compression is not successful for the first block, all input
227	* data is still in the window so we can still emit a stored block even
228	* when input comes from standard input. (This can also be done for
229	* all blocks if lit_bufsize is not greater than 32K.)
230	* - if compression is not successful for a file smaller than 64K, we can
231	* even emit a stored file instead of a stored block (saving 5 bytes).
232	* This is applicable only for zip (not gzip or zlib).
233	* - creating new Huffman trees less frequently may not provide fast
234	* adaptation to changes in the input data statistics. (Take for
235	* example a binary file with poorly compressible code followed by
236	* a highly compressible string table.) Smaller buffer sizes give
237	* fast adaptation but have of course the overhead of transmitting
238	* trees more frequently.
239	* - I can't count above 4
240	*/
241
242	uInt last_lit; /* running index in l_buf */
243
244	ushf *d_buf;
245	/* Buffer for distances. To simplify the code, d_buf and l_buf have
246	* the same number of elements. To use different lengths, an extra flag
247	* array would be necessary.
248	*/
249
250	ulg opt_len; /* bit length of current block with optimal trees */
251	ulg static_len; /* bit length of current block with static trees */
252	uInt matches; /* number of string matches in current block */
253	uInt insert; /* bytes at end of window left to insert */
254
255	#ifdef ZLIB_DEBUG
256	ulg compressed_len; /* total bit length of compressed file mod 2^32 */
257	ulg bits_sent; /* bit length of compressed data sent mod 2^32 */
258	#endif
259
260	ush bi_buf;
261	/* Output buffer. bits are inserted starting at the bottom (least
262	* significant bits).
263	*/
264	int bi_valid;
265	/* Number of valid bits in bi_buf. All bits above the last valid bit
266	* are always zero.
267	*/
268
269	ulg high_water;
270	/* High water mark offset in window for initialized bytes -- bytes above
271	* this are set to zero in order to avoid memory check warnings when
272	* longest match routines access bytes past the input. This is then
273	* updated to the new high water mark.
274	*/
275
276	} FAR deflate_state;
277
278	/* Output a byte on the stream.
279	* IN assertion: there is enough room in pending_buf.
280	*/
281	#define put_byte(s, c) {s->pending_buf[s->pending++] = (Bytef)(c);}
282
283
284	#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
285	/* Minimum amount of lookahead, except at the end of the input file.
286	* See deflate.c for comments about the MIN_MATCH+1.
287	*/
288
289	#define MAX_DIST(s) ((s)->w_size-MIN_LOOKAHEAD)
290	/* In order to simplify the code, particularly on 16 bit machines, match
291	* distances are limited to MAX_DIST instead of WSIZE.
292	*/
293
294	#define WIN_INIT MAX_MATCH
295	/* Number of bytes after end of data in window to initialize in order to avoid
296	memory checker errors from longest match routines */
297
298	/* in trees.c */
299	void ZLIB_INTERNAL _tr_init OF((deflate_state *s));
300	int ZLIB_INTERNAL _tr_tally OF((deflate_state *s, unsigned dist, unsigned lc));
301	void ZLIB_INTERNAL _tr_flush_block OF((deflate_state s, charf buf,
302	ulg stored_len, int last));
303	void ZLIB_INTERNAL _tr_flush_bits OF((deflate_state *s));
304	void ZLIB_INTERNAL _tr_align OF((deflate_state *s));
305	void ZLIB_INTERNAL _tr_stored_block OF((deflate_state s, charf buf,
306	ulg stored_len, int last));
307
308	#define d_code(dist) \
309	((dist) < 256 ? _dist_code[dist] : _dist_code[256+((dist)>>7)])
310	/* Mapping from a distance to a distance code. dist is the distance - 1 and
311	* must not have side effects. _dist_code[256] and _dist_code[257] are never
312	* used.
313	*/
314
315	#ifndef ZLIB_DEBUG
316	/* Inline versions of _tr_tally for speed: */
317
318	#if defined(GEN_TREES_H) \|\| !defined(STDC)
319	extern uch ZLIB_INTERNAL _length_code[];
320	extern uch ZLIB_INTERNAL _dist_code[];
321	#else
322	extern const uch ZLIB_INTERNAL _length_code[];
323	extern const uch ZLIB_INTERNAL _dist_code[];
324	#endif
325
326	# define _tr_tally_lit(s, c, flush) \
327	{ uch cc = (c); \
328	s->d_buf[s->last_lit] = 0; \
329	s->l_buf[s->last_lit++] = cc; \
330	s->dyn_ltree[cc].Freq++; \
331	flush = (s->last_lit == s->lit_bufsize-1); \
332	}
333	# define _tr_tally_dist(s, distance, length, flush) \
334	{ uch len = (uch)(length); \
335	ush dist = (ush)(distance); \
336	s->d_buf[s->last_lit] = dist; \
337	s->l_buf[s->last_lit++] = len; \
338	dist--; \
339	s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
340	s->dyn_dtree[d_code(dist)].Freq++; \
341	flush = (s->last_lit == s->lit_bufsize-1); \
342	}
343	#else
344	# define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c)
345	# define _tr_tally_dist(s, distance, length, flush) \
346	flush = _tr_tally(s, distance, length)
347	#endif
348
349	#endif /* DEFLATE_H */