| 1 | /* inftrees.h -- header to use inftrees.c
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| 2 | * Copyright (C) 1995-2002 Mark Adler
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| 3 | * For conditions of distribution and use, see copyright notice in zlib.h
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| 4 | */
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| 5 |
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| 6 | /* WARNING: this file should *not* be used by applications. It is
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| 7 | part of the implementation of the compression library and is
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| 8 | subject to change. Applications should only use zlib.h.
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| 9 | */
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| 10 |
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| 11 | /* Huffman code lookup table entry--this entry is four bytes for machines
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| 12 | that have 16-bit pointers (e.g. PC's in the small or medium model). */
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| 13 |
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| 14 | typedef struct inflate_huft_s FAR inflate_huft;
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| 15 |
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| 16 | struct inflate_huft_s {
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| 17 | union {
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| 18 | struct {
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| 19 | Byte Exop; /* number of extra bits or operation */
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| 20 | Byte Bits; /* number of bits in this code or subcode */
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| 21 | } what;
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| 22 | uInt pad; /* pad structure to a power of 2 (4 bytes for */
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| 23 | } word; /* 16-bit, 8 bytes for 32-bit int's) */
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| 24 | uInt base; /* literal, length base, distance base,
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| 25 | or table offset */
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| 26 | };
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| 27 |
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| 28 | /* Maximum size of dynamic tree. The maximum found in a long but non-
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| 29 | exhaustive search was 1004 huft structures (850 for length/literals
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| 30 | and 154 for distances, the latter actually the result of an
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| 31 | exhaustive search). The actual maximum is not known, but the
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| 32 | value below is more than safe. */
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| 33 | #define MANY 1440
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| 34 |
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| 35 | extern int inflate_trees_bits OF((
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| 36 | uIntf *, /* 19 code lengths */
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| 37 | uIntf *, /* bits tree desired/actual depth */
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| 38 | inflate_huft * FAR *, /* bits tree result */
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| 39 | inflate_huft *, /* space for trees */
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| 40 | z_streamp)); /* for messages */
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| 41 |
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| 42 | extern int inflate_trees_dynamic OF((
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| 43 | uInt, /* number of literal/length codes */
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| 44 | uInt, /* number of distance codes */
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| 45 | uIntf *, /* that many (total) code lengths */
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| 46 | uIntf *, /* literal desired/actual bit depth */
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| 47 | uIntf *, /* distance desired/actual bit depth */
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| 48 | inflate_huft * FAR *, /* literal/length tree result */
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| 49 | inflate_huft * FAR *, /* distance tree result */
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| 50 | inflate_huft *, /* space for trees */
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| 51 | z_streamp)); /* for messages */
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| 52 |
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| 53 | extern int inflate_trees_fixed OF((
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| 54 | uIntf *, /* literal desired/actual bit depth */
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| 55 | uIntf *, /* distance desired/actual bit depth */
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| 56 | inflate_huft * FAR *, /* literal/length tree result */
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| 57 | inflate_huft * FAR *, /* distance tree result */
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| 58 | z_streamp)); /* for memory allocation */
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