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Diffstat (limited to 'apps/plugins/imageviewer/png/inftrees.h')
-rw-r--r-- | apps/plugins/imageviewer/png/inftrees.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/apps/plugins/imageviewer/png/inftrees.h b/apps/plugins/imageviewer/png/inftrees.h new file mode 100644 index 0000000000..b1104c87e7 --- /dev/null +++ b/apps/plugins/imageviewer/png/inftrees.h | |||
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1 | /* inftrees.h -- header to use inftrees.c | ||
2 | * Copyright (C) 1995-2005 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 | 0001eeee - 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 dynamic tree. The maximum found in a long but non- | ||
39 | exhaustive search was 1444 code structures (852 for length/literals | ||
40 | and 592 for distances, the latter actually the result of an | ||
41 | exhaustive search). The true maximum is not known, but the value | ||
42 | below is more than safe. */ | ||
43 | #define ENOUGH 2048 | ||
44 | #define MAXD 592 | ||
45 | |||
46 | /* Type of code to build for inftable() */ | ||
47 | typedef enum { | ||
48 | CODES, | ||
49 | LENS, | ||
50 | DISTS | ||
51 | } codetype; | ||
52 | |||
53 | extern int inflate_table OF((codetype type, unsigned short FAR *lens, | ||
54 | unsigned codes, code FAR * FAR *table, | ||
55 | unsigned FAR *bits, unsigned short FAR *work)); | ||