Wei Chang Shen / DMemWin

Dependencies:   emwin_lib

Fork of DMemWin by Embedded Artists

png/inftrees.h@2:0e2ef1edf01b, 2016-06-02 (annotated)

Committer:
destinyXfate
Date:
Thu Jun 02 04:52:54 2016 +0000
Revision:
2:0e2ef1edf01b
;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
destinyXfate 2:0e2ef1edf01b 1 /* inftrees.h -- header to use inftrees.c
destinyXfate 2:0e2ef1edf01b 2 * Copyright (C) 1995-2005 Mark Adler
destinyXfate 2:0e2ef1edf01b 3 * For conditions of distribution and use, see copyright notice in zlib.h
destinyXfate 2:0e2ef1edf01b 4 */
destinyXfate 2:0e2ef1edf01b 5
destinyXfate 2:0e2ef1edf01b 6 /* WARNING: this file should *not* be used by applications. It is
destinyXfate 2:0e2ef1edf01b 7 part of the implementation of the compression library and is
destinyXfate 2:0e2ef1edf01b 8 subject to change. Applications should only use zlib.h.
destinyXfate 2:0e2ef1edf01b 9 */
destinyXfate 2:0e2ef1edf01b 10
destinyXfate 2:0e2ef1edf01b 11 /* Structure for decoding tables. Each entry provides either the
destinyXfate 2:0e2ef1edf01b 12 information needed to do the operation requested by the code that
destinyXfate 2:0e2ef1edf01b 13 indexed that table entry, or it provides a pointer to another
destinyXfate 2:0e2ef1edf01b 14 table that indexes more bits of the code. op indicates whether
destinyXfate 2:0e2ef1edf01b 15 the entry is a pointer to another table, a literal, a length or
destinyXfate 2:0e2ef1edf01b 16 distance, an end-of-block, or an invalid code. For a table
destinyXfate 2:0e2ef1edf01b 17 pointer, the low four bits of op is the number of index bits of
destinyXfate 2:0e2ef1edf01b 18 that table. For a length or distance, the low four bits of op
destinyXfate 2:0e2ef1edf01b 19 is the number of extra bits to get after the code. bits is
destinyXfate 2:0e2ef1edf01b 20 the number of bits in this code or part of the code to drop off
destinyXfate 2:0e2ef1edf01b 21 of the bit buffer. val is the actual byte to output in the case
destinyXfate 2:0e2ef1edf01b 22 of a literal, the base length or distance, or the offset from
destinyXfate 2:0e2ef1edf01b 23 the current table to the next table. Each entry is four bytes. */
destinyXfate 2:0e2ef1edf01b 24 typedef struct {
destinyXfate 2:0e2ef1edf01b 25 unsigned char op; /* operation, extra bits, table bits */
destinyXfate 2:0e2ef1edf01b 26 unsigned char bits; /* bits in this part of the code */
destinyXfate 2:0e2ef1edf01b 27 unsigned short val; /* offset in table or code value */
destinyXfate 2:0e2ef1edf01b 28 } code;
destinyXfate 2:0e2ef1edf01b 29
destinyXfate 2:0e2ef1edf01b 30 /* op values as set by inflate_table():
destinyXfate 2:0e2ef1edf01b 31 00000000 - literal
destinyXfate 2:0e2ef1edf01b 32 0000tttt - table link, tttt != 0 is the number of table index bits
destinyXfate 2:0e2ef1edf01b 33 0001eeee - length or distance, eeee is the number of extra bits
destinyXfate 2:0e2ef1edf01b 34 01100000 - end of block
destinyXfate 2:0e2ef1edf01b 35 01000000 - invalid code
destinyXfate 2:0e2ef1edf01b 36 */
destinyXfate 2:0e2ef1edf01b 37
destinyXfate 2:0e2ef1edf01b 38 /* Maximum size of dynamic tree. The maximum found in a long but non-
destinyXfate 2:0e2ef1edf01b 39 exhaustive search was 1444 code structures (852 for length/literals
destinyXfate 2:0e2ef1edf01b 40 and 592 for distances, the latter actually the result of an
destinyXfate 2:0e2ef1edf01b 41 exhaustive search). The true maximum is not known, but the value
destinyXfate 2:0e2ef1edf01b 42 below is more than safe. */
destinyXfate 2:0e2ef1edf01b 43 #define ENOUGH 2048
destinyXfate 2:0e2ef1edf01b 44 #define MAXD 592
destinyXfate 2:0e2ef1edf01b 45
destinyXfate 2:0e2ef1edf01b 46 /* Type of code to build for inftable() */
destinyXfate 2:0e2ef1edf01b 47 typedef enum {
destinyXfate 2:0e2ef1edf01b 48 CODES,
destinyXfate 2:0e2ef1edf01b 49 LENS,
destinyXfate 2:0e2ef1edf01b 50 DISTS
destinyXfate 2:0e2ef1edf01b 51 } codetype;
destinyXfate 2:0e2ef1edf01b 52
destinyXfate 2:0e2ef1edf01b 53 extern int inflate_table OF((codetype type, unsigned short FAR *lens,
destinyXfate 2:0e2ef1edf01b 54 unsigned codes, code FAR * FAR *table,
destinyXfate 2:0e2ef1edf01b 55 unsigned FAR *bits, unsigned short FAR *work));
destinyXfate 2:0e2ef1edf01b 56