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