Visualization Library 2.0.0-b5

A lightweight C++ OpenGL middleware for 2D/3D graphics

VL     Star     Watch     Fork     Issue

[Download] [Tutorials] [All Classes] [Grouped Classes]
inftree9.h
Go to the documentation of this file.
1 /* inftree9.h -- header to use inftree9.c
2  * Copyright (C) 1995-2008 Mark Adler
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 /* Structure for decoding tables. Each entry provides either the
12  information needed to do the operation requested by the code that
13  indexed that table entry, or it provides a pointer to another
14  table that indexes more bits of the code. op indicates whether
15  the entry is a pointer to another table, a literal, a length or
16  distance, an end-of-block, or an invalid code. For a table
17  pointer, the low four bits of op is the number of index bits of
18  that table. For a length or distance, the low four bits of op
19  is the number of extra bits to get after the code. bits is
20  the number of bits in this code or part of the code to drop off
21  of the bit buffer. val is the actual byte to output in the case
22  of a literal, the base length or distance, or the offset from
23  the current table to the next table. Each entry is four bytes. */
24 typedef struct {
25  unsigned char op; /* operation, extra bits, table bits */
26  unsigned char bits; /* bits in this part of the code */
27  unsigned short val; /* offset in table or code value */
28 } code;
29 
30 /* op values as set by inflate_table():
31  00000000 - literal
32  0000tttt - table link, tttt != 0 is the number of table index bits
33  100eeeee - length or distance, eeee is the number of extra bits
34  01100000 - end of block
35  01000000 - invalid code
36  */
37 
38 /* Maximum size of the dynamic table. The maximum number of code structures is
39  1446, which is the sum of 852 for literal/length codes and 594 for distance
40  codes. These values were found by exhaustive searches using the program
41  examples/enough.c found in the zlib distribtution. The arguments to that
42  program are the number of symbols, the initial root table size, and the
43  maximum bit length of a code. "enough 286 9 15" for literal/length codes
44  returns returns 852, and "enough 32 6 15" for distance codes returns 594.
45  The initial root table size (9 or 6) is found in the fifth argument of the
46  inflate_table() calls in infback9.c. If the root table size is changed,
47  then these maximum sizes would be need to be recalculated and updated. */
48 #define ENOUGH_LENS 852
49 #define ENOUGH_DISTS 594
50 #define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)
51 
52 /* Type of code to build for inflate_table9() */
53 typedef enum {
57 } codetype;
58 
59 extern int inflate_table9 OF((codetype type, unsigned short FAR *lens,
60  unsigned codes, code FAR * FAR *table,
61  unsigned FAR *bits, unsigned short FAR *work));
unsigned short val
Definition: inftree9.h:27
Definition: inftree9.h:55
codetype
Definition: inftree9.h:53
int inflate_table9(codetype type, unsigned short FAR *lens, unsigned codes, code FAR *FAR *table, unsigned FAR *bits, unsigned short FAR *work)
Definition: inftree9.c:32
unsigned char op
Definition: inftree9.h:25
Definition: inftree9.h:56
#define FAR
Definition: zconf.h:215
unsigned char bits
Definition: inftree9.h:26
Definition: inftree9.h:24
GLenum type
int inflate_table9 OF((codetype type, unsigned short FAR *lens, unsigned codes, code FAR *FAR *table, unsigned FAR *bits, unsigned short FAR *work))
Definition: inftree9.h:54
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
local int codes(struct state *s, const struct huffman *lencode, const struct huffman *distcode)
Definition: puff.c:436
local int * code
Definition: enough.c:174
GLenum GLsizei GLenum GLenum const GLvoid * table