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62 lines
2.4 KiB
62 lines
2.4 KiB
/* inftrees.h -- header to use inftrees.c |
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* Copyright (C) 1995 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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Valid extra bits (exop) are 0..13. exop == -64 is EOB (end of block), |
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exop == 16 means that v is a literal, exop < 0 means that v is a pointer |
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to the next table, which codes -exop bits, and lastly exop == -128 |
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indicates an unused code. If a code with exop == -128 is looked up, |
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this implies an error in the data. */ |
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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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char Exop; /* number of extra bits or operation */ |
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char Bits; /* number of bits in this code or subcode */ |
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} what; |
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Byte *pad; /* pad structure to a power of 2 (4 bytes for */ |
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} word; /* 16-bit, 8 bytes for 32-bit machines) */ |
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union { |
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uInt Base; /* literal, length base, or distance base */ |
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inflate_huft *Next; /* pointer to next level of table */ |
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} more; |
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}; |
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#ifdef DEBUG |
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extern uInt inflate_hufts; |
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#endif |
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extern int inflate_trees_bits __P(( |
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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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z_stream *)); /* for zalloc, zfree functions */ |
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extern int inflate_trees_dynamic __P(( |
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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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z_stream *)); /* for zalloc, zfree functions */ |
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extern int inflate_trees_fixed __P(( |
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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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extern int inflate_trees_free __P(( |
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inflate_huft *, /* tables to free */ |
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z_stream *)); /* for zfree function */
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