inftree.java

java 版本的zlib压缩代码

/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/*
Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright 
     notice, this list of conditions and the following disclaimer in 
     the documentation and/or other materials provided with the distribution.

  3. The names of the authors may not be used to endorse or promote products
     derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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 */
/*
 * This program is based on zlib-1.1.3, so all credit should go authors
 * Jean-loup Gailly([e-mail]) and Mark Adler([e-mail])
 * and contributors of zlib.
 */

package com.jcraft.jzlib;

final class InfTree{

  static final private int MANY=1440;

  static final private int Z_OK=0;
  static final private int Z_STREAM_END=1;
  static final private int Z_NEED_DICT=2;
  static final private int Z_ERRNO=-1;
  static final private int Z_STREAM_ERROR=-2;
  static final private int Z_DATA_ERROR=-3;
  static final private int Z_MEM_ERROR=-4;
  static final private int Z_BUF_ERROR=-5;
  static final private int Z_VERSION_ERROR=-6;

  static final int fixed_bl = 9;
  static final int fixed_bd = 5;

  static final int[] fixed_tl = {
    96,7,256, 0,8,80, 0,8,16, 84,8,115,
    82,7,31, 0,8,112, 0,8,48, 0,9,192,
    80,7,10, 0,8,96, 0,8,32, 0,9,160,
    0,8,0, 0,8,128, 0,8,64, 0,9,224,
    80,7,6, 0,8,88, 0,8,24, 0,9,144,
    83,7,59, 0,8,120, 0,8,56, 0,9,208,
    81,7,17, 0,8,104, 0,8,40, 0,9,176,
    0,8,8, 0,8,136, 0,8,72, 0,9,240,
    80,7,4, 0,8,84, 0,8,20, 85,8,227,
    83,7,43, 0,8,116, 0,8,52, 0,9,200,
    81,7,13, 0,8,100, 0,8,36, 0,9,168,
    0,8,4, 0,8,132, 0,8,68, 0,9,232,
    80,7,8, 0,8,92, 0,8,28, 0,9,152,
    84,7,83, 0,8,124, 0,8,60, 0,9,216,
    82,7,23, 0,8,108, 0,8,44, 0,9,184,
    0,8,12, 0,8,140, 0,8,76, 0,9,248,
    80,7,3, 0,8,82, 0,8,18, 85,8,163,
    83,7,35, 0,8,114, 0,8,50, 0,9,196,
    81,7,11, 0,8,98, 0,8,34, 0,9,164,
    0,8,2, 0,8,130, 0,8,66, 0,9,228,
    80,7,7, 0,8,90, 0,8,26, 0,9,148,
    84,7,67, 0,8,122, 0,8,58, 0,9,212,
    82,7,19, 0,8,106, 0,8,42, 0,9,180,
    0,8,10, 0,8,138, 0,8,74, 0,9,244,
    80,7,5, 0,8,86, 0,8,22, 192,8,0,
    83,7,51, 0,8,118, 0,8,54, 0,9,204,
    81,7,15, 0,8,102, 0,8,38, 0,9,172,
    0,8,6, 0,8,134, 0,8,70, 0,9,236,
    80,7,9, 0,8,94, 0,8,30, 0,9,156,
    84,7,99, 0,8,126, 0,8,62, 0,9,220,
    82,7,27, 0,8,110, 0,8,46, 0,9,188,
    0,8,14, 0,8,142, 0,8,78, 0,9,252,
    96,7,256, 0,8,81, 0,8,17, 85,8,131,
    82,7,31, 0,8,113, 0,8,49, 0,9,194,
    80,7,10, 0,8,97, 0,8,33, 0,9,162,
    0,8,1, 0,8,129, 0,8,65, 0,9,226,
    80,7,6, 0,8,89, 0,8,25, 0,9,146,
    83,7,59, 0,8,121, 0,8,57, 0,9,210,
    81,7,17, 0,8,105, 0,8,41, 0,9,178,
    0,8,9, 0,8,137, 0,8,73, 0,9,242,
    80,7,4, 0,8,85, 0,8,21, 80,8,258,
    83,7,43, 0,8,117, 0,8,53, 0,9,202,
    81,7,13, 0,8,101, 0,8,37, 0,9,170,
    0,8,5, 0,8,133, 0,8,69, 0,9,234,
    80,7,8, 0,8,93, 0,8,29, 0,9,154,
    84,7,83, 0,8,125, 0,8,61, 0,9,218,
    82,7,23, 0,8,109, 0,8,45, 0,9,186,
    0,8,13, 0,8,141, 0,8,77, 0,9,250,
    80,7,3, 0,8,83, 0,8,19, 85,8,195,
    83,7,35, 0,8,115, 0,8,51, 0,9,198,
    81,7,11, 0,8,99, 0,8,35, 0,9,166,
    0,8,3, 0,8,131, 0,8,67, 0,9,230,
    80,7,7, 0,8,91, 0,8,27, 0,9,150,
    84,7,67, 0,8,123, 0,8,59, 0,9,214,
    82,7,19, 0,8,107, 0,8,43, 0,9,182,
    0,8,11, 0,8,139, 0,8,75, 0,9,246,
    80,7,5, 0,8,87, 0,8,23, 192,8,0,
    83,7,51, 0,8,119, 0,8,55, 0,9,206,
    81,7,15, 0,8,103, 0,8,39, 0,9,174,
    0,8,7, 0,8,135, 0,8,71, 0,9,238,
    80,7,9, 0,8,95, 0,8,31, 0,9,158,
    84,7,99, 0,8,127, 0,8,63, 0,9,222,
    82,7,27, 0,8,111, 0,8,47, 0,9,190,
    0,8,15, 0,8,143, 0,8,79, 0,9,254,
    96,7,256, 0,8,80, 0,8,16, 84,8,115,
    82,7,31, 0,8,112, 0,8,48, 0,9,193,

    80,7,10, 0,8,96, 0,8,32, 0,9,161,
    0,8,0, 0,8,128, 0,8,64, 0,9,225,
    80,7,6, 0,8,88, 0,8,24, 0,9,145,
    83,7,59, 0,8,120, 0,8,56, 0,9,209,
    81,7,17, 0,8,104, 0,8,40, 0,9,177,
    0,8,8, 0,8,136, 0,8,72, 0,9,241,
    80,7,4, 0,8,84, 0,8,20, 85,8,227,
    83,7,43, 0,8,116, 0,8,52, 0,9,201,
    81,7,13, 0,8,100, 0,8,36, 0,9,169,
    0,8,4, 0,8,132, 0,8,68, 0,9,233,
    80,7,8, 0,8,92, 0,8,28, 0,9,153,
    84,7,83, 0,8,124, 0,8,60, 0,9,217,
    82,7,23, 0,8,108, 0,8,44, 0,9,185,
    0,8,12, 0,8,140, 0,8,76, 0,9,249,
    80,7,3, 0,8,82, 0,8,18, 85,8,163,
    83,7,35, 0,8,114, 0,8,50, 0,9,197,
    81,7,11, 0,8,98, 0,8,34, 0,9,165,
    0,8,2, 0,8,130, 0,8,66, 0,9,229,
    80,7,7, 0,8,90, 0,8,26, 0,9,149,
    84,7,67, 0,8,122, 0,8,58, 0,9,213,
    82,7,19, 0,8,106, 0,8,42, 0,9,181,
    0,8,10, 0,8,138, 0,8,74, 0,9,245,
    80,7,5, 0,8,86, 0,8,22, 192,8,0,
    83,7,51, 0,8,118, 0,8,54, 0,9,205,
    81,7,15, 0,8,102, 0,8,38, 0,9,173,
    0,8,6, 0,8,134, 0,8,70, 0,9,237,
    80,7,9, 0,8,94, 0,8,30, 0,9,157,
    84,7,99, 0,8,126, 0,8,62, 0,9,221,
    82,7,27, 0,8,110, 0,8,46, 0,9,189,
    0,8,14, 0,8,142, 0,8,78, 0,9,253,
    96,7,256, 0,8,81, 0,8,17, 85,8,131,
    82,7,31, 0,8,113, 0,8,49, 0,9,195,
    80,7,10, 0,8,97, 0,8,33, 0,9,163,
    0,8,1, 0,8,129, 0,8,65, 0,9,227,
    80,7,6, 0,8,89, 0,8,25, 0,9,147,
    83,7,59, 0,8,121, 0,8,57, 0,9,211,
    81,7,17, 0,8,105, 0,8,41, 0,9,179,
    0,8,9, 0,8,137, 0,8,73, 0,9,243,
    80,7,4, 0,8,85, 0,8,21, 80,8,258,
    83,7,43, 0,8,117, 0,8,53, 0,9,203,
    81,7,13, 0,8,101, 0,8,37, 0,9,171,
    0,8,5, 0,8,133, 0,8,69, 0,9,235,
    80,7,8, 0,8,93, 0,8,29, 0,9,155,
    84,7,83, 0,8,125, 0,8,61, 0,9,219,
    82,7,23, 0,8,109, 0,8,45, 0,9,187,
    0,8,13, 0,8,141, 0,8,77, 0,9,251,
    80,7,3, 0,8,83, 0,8,19, 85,8,195,
    83,7,35, 0,8,115, 0,8,51, 0,9,199,
    81,7,11, 0,8,99, 0,8,35, 0,9,167,
    0,8,3, 0,8,131, 0,8,67, 0,9,231,
    80,7,7, 0,8,91, 0,8,27, 0,9,151,
    84,7,67, 0,8,123, 0,8,59, 0,9,215,
    82,7,19, 0,8,107, 0,8,43, 0,9,183,
    0,8,11, 0,8,139, 0,8,75, 0,9,247,
    80,7,5, 0,8,87, 0,8,23, 192,8,0,
    83,7,51, 0,8,119, 0,8,55, 0,9,207,
    81,7,15, 0,8,103, 0,8,39, 0,9,175,
    0,8,7, 0,8,135, 0,8,71, 0,9,239,
    80,7,9, 0,8,95, 0,8,31, 0,9,159,
    84,7,99, 0,8,127, 0,8,63, 0,9,223,
    82,7,27, 0,8,111, 0,8,47, 0,9,191,
    0,8,15, 0,8,143, 0,8,79, 0,9,255
  };
  static final int[] fixed_td = {
    80,5,1, 87,5,257, 83,5,17, 91,5,4097,
    81,5,5, 89,5,1025, 85,5,65, 93,5,16385,
    80,5,3, 88,5,513, 84,5,33, 92,5,8193,
    82,5,9, 90,5,2049, 86,5,129, 192,5,24577,
    80,5,2, 87,5,385, 83,5,25, 91,5,6145,
    81,5,7, 89,5,1537, 85,5,97, 93,5,24577,
    80,5,4, 88,5,769, 84,5,49, 92,5,12289,
    82,5,13, 90,5,3073, 86,5,193, 192,5,24577
  };

  // Tables for deflate from PKZIP's appnote.txt.
  static final int[] cplens = { // Copy lengths for literal codes 257..285
        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
        35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
  };

  // see note #13 above about 258
  static final int[] cplext = { // Extra bits for literal codes 257..285
        0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
        3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 112, 112  // 112==invalid
  };

  static final int[] cpdist = { // Copy offsets for distance codes 0..29
        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
        257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
        8193, 12289, 16385, 24577
  };

  static final int[] cpdext = { // Extra bits for distance codes
        0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
        7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
        12, 12, 13, 13};

  // If BMAX needs to be larger than 16, then h and x[] should be uLong.
  static final int BMAX=15;         // maximum bit length of any code

  int[] hn = null;  // hufts used in space
  int[] v = null;   // work area for huft_build 
  int[] c = null;   // bit length count table
  int[] r = null;   // table entry for structure assignment
  int[] u = null;   // table stack
  int[] x = null;   // bit offsets, then code stack

  private int huft_build(int[] b, // code lengths in bits (all assumed <= BMAX)
                         int bindex, 
                         int n,   // number of codes (assumed <= 288)
                         int s,   // number of simple-valued codes (0..s-1)
                         int[] d, // list of base values for non-simple codes
                         int[] e, // list of extra bits for non-simple codes
                         int[] t, // result: starting table
                         int[] m, // maximum lookup bits, returns actual
                         int[] hp,// space for trees
                         int[] hn,// hufts used in space
                         int[] v  // working area: values in order of bit length
                         ){
    // Given a list of code lengths and a maximum table size, make a set of
    // tables to decode that set of codes.  Return Z_OK on success, Z_BUF_ERROR
    // if the given code set is incomplete (the tables are still built in this
    // case), Z_DATA_ERROR if the input is invalid (an over-subscribed set of
    // lengths), or Z_MEM_ERROR if not enough memory.

    int a;                       // counter for codes of length k
    int f;                       // i repeats in table every f entries
    int g;                       // maximum code length
    int h;                       // table level
    int i;                       // counter, current code
    int j;                       // counter
    int k;                       // number of bits in current code
    int l;                       // bits per table (returned in m)
    int mask;                    // (1 << w) - 1, to avoid cc -O bug on HP
    int p;                       // pointer into c[], b[], or v[]
    int q;                       // points to current table
    int w;                       // bits before this table == (l * h)
    int xp;                      // pointer into x
    int y;                       // number of dummy codes added
    int z;                       // number of entries in current table