/* inftrees.h -- header to use inftrees.c | |
* Copyright (C) 1995-2002 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 FAR 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 | |
local int inflate_trees_bits OF(( | |
uIntf *, /* 19 code lengths */ | |
uIntf *, /* bits tree desired/actual depth */ | |
inflate_huft * FAR *, /* bits tree result */ | |
inflate_huft *, /* space for trees */ | |
z_streamp)); /* for messages */ | |
local int inflate_trees_dynamic OF(( | |
uInt, /* number of literal/length codes */ | |
uInt, /* number of distance codes */ | |
uIntf *, /* that many (total) code lengths */ | |
uIntf *, /* literal desired/actual bit depth */ | |
uIntf *, /* distance desired/actual bit depth */ | |
inflate_huft * FAR *, /* literal/length tree result */ | |
inflate_huft * FAR *, /* distance tree result */ | |
inflate_huft *, /* space for trees */ | |
z_streamp)); /* for messages */ | |
local int inflate_trees_fixed OF(( | |
uIntf *, /* literal desired/actual bit depth */ | |
uIntf *, /* distance desired/actual bit depth */ | |
const inflate_huft * FAR *, /* literal/length tree result */ | |
const inflate_huft * FAR *, /* distance tree result */ | |
z_streamp)); /* for memory allocation */ | |
#endif /* _INFTREES_H */ |