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1 /* inftrees.h -- header to use inftrees.c
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2 * Copyright (C) 1995 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 Bytef *pad; /* pad structure to a power of 2 (4 bytes for */
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23 } word; /* 16-bit, 8 bytes for 32-bit machines) */
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24 union {
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25 uInt Base; /* literal, length base, or distance base */
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26 inflate_huft *Next; /* pointer to next level of table */
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27 } more;
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28 };
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29
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30 #ifdef DEBUG
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31 extern uInt inflate_hufts;
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32 #endif
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33
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34 extern int inflate_trees_bits OF((
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35 uIntf *, /* 19 code lengths */
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36 uIntf *, /* bits tree desired/actual depth */
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37 inflate_huft * FAR *, /* bits tree result */
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38 z_stream *)); /* for zalloc, zfree functions */
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39
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40 extern int inflate_trees_dynamic OF((
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41 uInt, /* number of literal/length codes */
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42 uInt, /* number of distance codes */
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43 uIntf *, /* that many (total) code lengths */
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44 uIntf *, /* literal desired/actual bit depth */
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45 uIntf *, /* distance desired/actual bit depth */
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46 inflate_huft * FAR *, /* literal/length tree result */
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47 inflate_huft * FAR *, /* distance tree result */
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48 z_stream *)); /* for zalloc, zfree functions */
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49
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50 extern int inflate_trees_fixed OF((
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51 uIntf *, /* literal desired/actual bit depth */
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52 uIntf *, /* distance desired/actual bit depth */
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53 inflate_huft * FAR *, /* literal/length tree result */
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54 inflate_huft * FAR *)); /* distance tree result */
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55
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56 extern int inflate_trees_free OF((
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57 inflate_huft *, /* tables to free */
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58 z_stream *)); /* for zfree function */
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59
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