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1da177e4 LT |
1 | /* inftrees.h -- header to use inftrees.c |
2 | * Copyright (C) 1995-1998 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 | /* Huffman code lookup table entry--this entry is four bytes for machines | |
12 | that have 16-bit pointers (e.g. PC's in the small or medium model). */ | |
13 | ||
14 | #ifndef _INFTREES_H | |
15 | #define _INFTREES_H | |
16 | ||
17 | typedef struct inflate_huft_s inflate_huft; | |
18 | ||
19 | struct inflate_huft_s { | |
20 | union { | |
21 | struct { | |
22 | Byte Exop; /* number of extra bits or operation */ | |
23 | Byte Bits; /* number of bits in this code or subcode */ | |
24 | } what; | |
25 | uInt pad; /* pad structure to a power of 2 (4 bytes for */ | |
26 | } word; /* 16-bit, 8 bytes for 32-bit int's) */ | |
27 | uInt base; /* literal, length base, distance base, | |
28 | or table offset */ | |
29 | }; | |
30 | ||
31 | /* Maximum size of dynamic tree. The maximum found in a long but non- | |
32 | exhaustive search was 1004 huft structures (850 for length/literals | |
33 | and 154 for distances, the latter actually the result of an | |
34 | exhaustive search). The actual maximum is not known, but the | |
35 | value below is more than safe. */ | |
36 | #define MANY 1440 | |
37 | ||
38 | extern int zlib_inflate_trees_bits ( | |
39 | uInt *, /* 19 code lengths */ | |
40 | uInt *, /* bits tree desired/actual depth */ | |
41 | inflate_huft **, /* bits tree result */ | |
42 | inflate_huft *, /* space for trees */ | |
43 | z_streamp); /* for messages */ | |
44 | ||
45 | extern int zlib_inflate_trees_dynamic ( | |
46 | uInt, /* number of literal/length codes */ | |
47 | uInt, /* number of distance codes */ | |
48 | uInt *, /* that many (total) code lengths */ | |
49 | uInt *, /* literal desired/actual bit depth */ | |
50 | uInt *, /* distance desired/actual bit depth */ | |
51 | inflate_huft **, /* literal/length tree result */ | |
52 | inflate_huft **, /* distance tree result */ | |
53 | inflate_huft *, /* space for trees */ | |
54 | z_streamp); /* for messages */ | |
55 | ||
56 | extern int zlib_inflate_trees_fixed ( | |
57 | uInt *, /* literal desired/actual bit depth */ | |
58 | uInt *, /* distance desired/actual bit depth */ | |
59 | inflate_huft **, /* literal/length tree result */ | |
60 | inflate_huft **, /* distance tree result */ | |
61 | inflate_huft *, /* space for trees */ | |
62 | z_streamp); /* for memory allocation */ | |
63 | ||
64 | #endif /* _INFTREES_H */ |