istereo2

annotate libs/zlib/inftrees.h @ 2:81d35769f546

added the tunnel effect source
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 19 Sep 2015 05:51:51 +0300
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nuclear@2 1 /* inftrees.h -- header to use inftrees.c
nuclear@2 2 * Copyright (C) 1995-2005 Mark Adler
nuclear@2 3 * For conditions of distribution and use, see copyright notice in zlib.h
nuclear@2 4 */
nuclear@2 5
nuclear@2 6 /* WARNING: this file should *not* be used by applications. It is
nuclear@2 7 part of the implementation of the compression library and is
nuclear@2 8 subject to change. Applications should only use zlib.h.
nuclear@2 9 */
nuclear@2 10
nuclear@2 11 /* Structure for decoding tables. Each entry provides either the
nuclear@2 12 information needed to do the operation requested by the code that
nuclear@2 13 indexed that table entry, or it provides a pointer to another
nuclear@2 14 table that indexes more bits of the code. op indicates whether
nuclear@2 15 the entry is a pointer to another table, a literal, a length or
nuclear@2 16 distance, an end-of-block, or an invalid code. For a table
nuclear@2 17 pointer, the low four bits of op is the number of index bits of
nuclear@2 18 that table. For a length or distance, the low four bits of op
nuclear@2 19 is the number of extra bits to get after the code. bits is
nuclear@2 20 the number of bits in this code or part of the code to drop off
nuclear@2 21 of the bit buffer. val is the actual byte to output in the case
nuclear@2 22 of a literal, the base length or distance, or the offset from
nuclear@2 23 the current table to the next table. Each entry is four bytes. */
nuclear@2 24 typedef struct {
nuclear@2 25 unsigned char op; /* operation, extra bits, table bits */
nuclear@2 26 unsigned char bits; /* bits in this part of the code */
nuclear@2 27 unsigned short val; /* offset in table or code value */
nuclear@2 28 } code;
nuclear@2 29
nuclear@2 30 /* op values as set by inflate_table():
nuclear@2 31 00000000 - literal
nuclear@2 32 0000tttt - table link, tttt != 0 is the number of table index bits
nuclear@2 33 0001eeee - length or distance, eeee is the number of extra bits
nuclear@2 34 01100000 - end of block
nuclear@2 35 01000000 - invalid code
nuclear@2 36 */
nuclear@2 37
nuclear@2 38 /* Maximum size of dynamic tree. The maximum found in a long but non-
nuclear@2 39 exhaustive search was 1444 code structures (852 for length/literals
nuclear@2 40 and 592 for distances, the latter actually the result of an
nuclear@2 41 exhaustive search). The true maximum is not known, but the value
nuclear@2 42 below is more than safe. */
nuclear@2 43 #define ENOUGH 2048
nuclear@2 44 #define MAXD 592
nuclear@2 45
nuclear@2 46 /* Type of code to build for inftable() */
nuclear@2 47 typedef enum {
nuclear@2 48 CODES,
nuclear@2 49 LENS,
nuclear@2 50 DISTS
nuclear@2 51 } codetype;
nuclear@2 52
nuclear@2 53 extern int inflate_table OF((codetype type, unsigned short FAR *lens,
nuclear@2 54 unsigned codes, code FAR * FAR *table,
nuclear@2 55 unsigned FAR *bits, unsigned short FAR *work));