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/*
* Copyright (C) 1995-1998 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
/**
* \file inftrees.h
* Header to use inftrees.c.
*/
/* 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). */
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
extern int inflate_trees_bits OF((
uIntf *c, /* 19 code lengths */
uIntf *bb, /* bits tree desired/actual depth */
inflate_huft * FAR *tb, /* bits tree result */
inflate_huft *hp, /* space for trees */
z_streamp z)) /* for messages */
/*@modifies *bb, *tb, *hp @*/;
extern int inflate_trees_dynamic OF((
uInt nl, /* number of literal/length codes */
uInt nd, /* number of distance codes */
uIntf *c, /* that many (total) code lengths */
uIntf *bl, /* literal desired/actual bit depth */
uIntf *bd, /* distance desired/actual bit depth */
inflate_huft * FAR *tl, /* literal/length tree result */
inflate_huft * FAR *td, /* distance tree result */
inflate_huft *hp, /* space for trees */
z_streamp z)) /* for messages */
/*@modifies *bl, *bd, *tl, *td, *hp @*/;
extern int inflate_trees_fixed OF((
uIntf *bl, /* literal desired/actual bit depth */
uIntf *bd, /* distance desired/actual bit depth */
inflate_huft * FAR *tl, /* literal/length tree result */
inflate_huft * FAR *td, /* distance tree result */
z_streamp z)) /* for memory allocation */
/*@modifies *bl, *bd, *tl, *td @*/;
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