/* deflate.h -- internal compression state
- * Copyright (C) 1995 Jean-loup Gailly
- * For conditions of distribution and use, see copyright notice in zlib.h
+ * Copyright (C) 1995-2002 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
subject to change. Applications should only use zlib.h.
*/
-/* $Id: deflate.h,v 1.3 1995/04/14 12:39:45 jloup Exp $ */
+/* @(#) $Id$ */
+
+#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.
*/
-/* Data type */
-#define BINARY 0
-#define ASCII 1
-#define UNKNOWN 2
-
#define LENGTH_CODES 29
/* number of length codes, not counting the special END_BLOCK code */
ush dad; /* father node in Huffman tree */
ush len; /* length of bit string */
} dl;
-} ct_data;
+} FAR ct_data;
#define Freq fc.freq
#define Code fc.code
ct_data *dyn_tree; /* the dynamic tree */
int max_code; /* largest code with non zero frequency */
static_tree_desc *stat_desc; /* the corresponding static tree */
-} tree_desc;
+} 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_stream *strm; /* pointer back to this zlib stream */
+ z_streamp strm; /* pointer back to this zlib stream */
int status; /* as the name implies */
- Byte *pending_buf; /* output still pending */
- Byte *pending_out; /* next pending byte to output to the stream */
+ 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 */
int pending; /* nb of bytes in the pending buffer */
- uLong adler; /* adler32 of uncompressed data */
- int noheader; /* suppress zlib header and adler32 */
- Byte data_type; /* UNKNOWN, BINARY or ASCII */
+ int wrap; /* bit 0 true for zlib, bit 1 true for gzip */
Byte method; /* STORED (for zip only) or DEFLATED */
+ int last_flush; /* value of flush param for previous deflate call */
- /* used by deflate.c: */
+ /* 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 */
- Byte *window;
+ 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
* is directly used as sliding window.
*/
- Pos *prev;
+ 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.
*/
- Pos *head; /* Heads of the hash chains or NIL. */
+ 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 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: */
+ int nice_match; /* Stop searching when current match exceeds this */
- ct_data dyn_ltree[HEAP_SIZE]; /* literal and length tree */
- ct_data dyn_dtree[2*D_CODES+1]; /* distance tree */
- ct_data bl_tree[2*BL_CODES+1]; /* Huffman tree for the bit lengths */
+ /* used by trees.c: */
+ /* Didn't use ct_data typedef below to supress 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 */
- tree_desc l_desc; /* descriptor for literal tree */
- tree_desc d_desc; /* descriptor for distance tree */
- tree_desc bl_desc; /* descriptor for bit length tree */
+ 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 */
/* Depth of each subtree used as tie breaker for trees of equal frequency
*/
- uch *l_buf; /* buffer for literals or lengths */
+ uchf *l_buf; /* buffer for literals or lengths */
uInt lit_bufsize;
/* Size of match buffer for literals/lengths. There are 4 reasons for
uInt last_lit; /* running index in l_buf */
- ush *d_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 */
- ulg compressed_len; /* total bit length of compressed file */
uInt matches; /* number of string matches in current block */
+ int last_eob_len; /* bit length of EOB code for last block */
#ifdef DEBUG
- ulg bits_sent; /* bit length of the compressed data */
+ 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;
* are always zero.
*/
-} deflate_state;
-
+} FAR deflate_state;
/* Output a byte on the stream.
* IN assertion: there is enough room in pending_buf.
* distances are limited to MAX_DIST instead of WSIZE.
*/
- /* in trees.c */
-void ct_init __P((deflate_state *s));
-int ct_tally __P((deflate_state *s, int dist, int lc));
-ulg ct_flush_block __P((deflate_state *s, char *buf, ulg stored_len, int eof));
+ /* in trees.c */
+void _tr_init OF((deflate_state *s));
+int _tr_tally OF((deflate_state *s, unsigned dist, unsigned lc));
+void _tr_flush_block OF((deflate_state *s, charf *buf, ulg stored_len,
+ int eof));
+void _tr_align OF((deflate_state *s));
+void _tr_stored_block OF((deflate_state *s, charf *buf, ulg stored_len,
+ int eof));
+
+#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 DEBUG
+/* Inline versions of _tr_tally for speed: */
+
+#if defined(GEN_TREES_H) || !defined(STDC)
+ extern uch _length_code[];
+ extern uch _dist_code[];
+#else
+ extern const uch _length_code[];
+ extern const uch _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 = (length); \
+ ush dist = (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 */
projects / zlib.git / blobdiff