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 #ifndef _INFTREES_H |
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15 #define _INFTREES_H |
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16 |
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17 typedef struct inflate_huft_s FAR inflate_huft; |
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18 |
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19 struct inflate_huft_s { |
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20 union { |
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21 struct { |
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22 Byte Exop; /* number of extra bits or operation */ |
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23 Byte Bits; /* number of bits in this code or subcode */ |
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24 } what; |
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25 uInt pad; /* pad structure to a power of 2 (4 bytes for */ |
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26 } word; /* 16-bit, 8 bytes for 32-bit int's) */ |
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27 uInt base; /* literal, length base, distance base, |
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28 or table offset */ |
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29 }; |
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30 |
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31 /* Maximum size of dynamic tree. The maximum found in a long but non- |
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32 exhaustive search was 1004 huft structures (850 for length/literals |
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33 and 154 for distances, the latter actually the result of an |
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34 exhaustive search). The actual maximum is not known, but the |
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35 value below is more than safe. */ |
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36 #define MANY 1440 |
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37 |
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38 local int inflate_trees_bits OF(( |
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39 uIntf *, /* 19 code lengths */ |
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40 uIntf *, /* bits tree desired/actual depth */ |
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41 inflate_huft * FAR *, /* bits tree result */ |
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42 inflate_huft *, /* space for trees */ |
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43 z_streamp)); /* for messages */ |
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44 |
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45 local int inflate_trees_dynamic OF(( |
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46 uInt, /* number of literal/length codes */ |
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47 uInt, /* number of distance codes */ |
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48 uIntf *, /* that many (total) code lengths */ |
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49 uIntf *, /* literal desired/actual bit depth */ |
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50 uIntf *, /* distance desired/actual bit depth */ |
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51 inflate_huft * FAR *, /* literal/length tree result */ |
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52 inflate_huft * FAR *, /* distance tree result */ |
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53 inflate_huft *, /* space for trees */ |
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54 z_streamp)); /* for messages */ |
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55 |
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56 local int inflate_trees_fixed OF(( |
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57 uIntf *, /* literal desired/actual bit depth */ |
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58 uIntf *, /* distance desired/actual bit depth */ |
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59 const inflate_huft * FAR *, /* literal/length tree result */ |
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60 const inflate_huft * FAR *, /* distance tree result */ |
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61 z_streamp)); /* for memory allocation */ |
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62 |
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63 #endif /* _INFTREES_H */ |
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