| /* inftrees.h -- header to use inftrees.c |
| * Copyright (C) 1995-1998 Mark Adler |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| /* WARNING: this file should *not* be used by applications. It is |
| part of the implementation of the compression library and is |
| subject to change. Applications should only use zlib.h. |
| */ |
| |
| /* Huffman code lookup table entry--this entry is four bytes for machines |
| that have 16-bit pointers (e.g. PC's in the small or medium model). */ |
| |
| #ifndef _INFTREES_H |
| #define _INFTREES_H |
| |
| typedef struct inflate_huft_s inflate_huft; |
| |
| struct inflate_huft_s { |
| union { |
| struct { |
| Byte Exop; /* number of extra bits or operation */ |
| Byte Bits; /* number of bits in this code or subcode */ |
| } what; |
| uInt pad; /* pad structure to a power of 2 (4 bytes for */ |
| } word; /* 16-bit, 8 bytes for 32-bit int's) */ |
| uInt base; /* literal, length base, distance base, |
| or table offset */ |
| }; |
| |
| /* Maximum size of dynamic tree. The maximum found in a long but non- |
| exhaustive search was 1004 huft structures (850 for length/literals |
| and 154 for distances, the latter actually the result of an |
| exhaustive search). The actual maximum is not known, but the |
| value below is more than safe. */ |
| #define MANY 1440 |
| |
| extern int zlib_inflate_trees_bits ( |
| uInt *, /* 19 code lengths */ |
| uInt *, /* bits tree desired/actual depth */ |
| inflate_huft **, /* bits tree result */ |
| inflate_huft *, /* space for trees */ |
| z_streamp); /* for messages */ |
| |
| extern int zlib_inflate_trees_dynamic ( |
| uInt, /* number of literal/length codes */ |
| uInt, /* number of distance codes */ |
| uInt *, /* that many (total) code lengths */ |
| uInt *, /* literal desired/actual bit depth */ |
| uInt *, /* distance desired/actual bit depth */ |
| inflate_huft **, /* literal/length tree result */ |
| inflate_huft **, /* distance tree result */ |
| inflate_huft *, /* space for trees */ |
| z_streamp); /* for messages */ |
| |
| extern int zlib_inflate_trees_fixed ( |
| uInt *, /* literal desired/actual bit depth */ |
| uInt *, /* distance desired/actual bit depth */ |
| inflate_huft **, /* literal/length tree result */ |
| inflate_huft **, /* distance tree result */ |
| inflate_huft *, /* space for trees */ |
| z_streamp); /* for memory allocation */ |
| |
| #endif /* _INFTREES_H */ |