| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |