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1 /* inftrees.h -- header to use inftrees.c
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2 * Copyright (C) 1995-1998 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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