510Connectbot: src/com/jcraft/jzlib/Tree.java annotate

annotate src/com/jcraft/jzlib/Tree.java @ 435:9c6a269fabb5 stable-1.9.2

add bitcoin donation address

author	Carl Byington <carl@five-ten-sg.com>
date	Thu, 09 Apr 2015 11:32:38 -0700
parents	46c2115ae1c8
children

rev	line source
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	1 /* --mode:java; c-basic-offset:2; -- */
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	2 /*
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	3 Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	4
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	5 Redistribution and use in source and binary forms, with or without
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	6 modification, are permitted provided that the following conditions are met:
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	7
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	8 1. Redistributions of source code must retain the above copyright notice,
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	9 this list of conditions and the following disclaimer.
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	10
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	11 2. Redistributions in binary form must reproduce the above copyright
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	12 notice, this list of conditions and the following disclaimer in
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	13 the documentation and/or other materials provided with the distribution.
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	14
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	15 3. The names of the authors may not be used to endorse or promote products
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	16 derived from this software without specific prior written permission.
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	17
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	18 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	19 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	20 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	21 INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	22 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	23 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	24 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	25 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	26 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	27 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	28 */
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	29 /*
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	30 * This program is based on zlib-1.1.3, so all credit should go authors
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	31 * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	32 * and contributors of zlib.
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	33 */
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	34
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	35 package com.jcraft.jzlib;
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	36
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	37 final class Tree{
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	38 static final private int MAX_BITS=15;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	39 static final private int BL_CODES=19;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	40 static final private int D_CODES=30;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	41 static final private int LITERALS=256;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	42 static final private int LENGTH_CODES=29;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	43 static final private int L_CODES=(LITERALS+1+LENGTH_CODES);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	44 static final private int HEAP_SIZE=(2*L_CODES+1);
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	45
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	46 // Bit length codes must not exceed MAX_BL_BITS bits
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	47 static final int MAX_BL_BITS=7;
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	48
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	49 // end of block literal code
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	50 static final int END_BLOCK=256;
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	51
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	52 // repeat previous bit length 3-6 times (2 bits of repeat count)
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	53 static final int REP_3_6=16;
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	54
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	55 // repeat a zero length 3-10 times (3 bits of repeat count)
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	56 static final int REPZ_3_10=17;
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	57
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	58 // repeat a zero length 11-138 times (7 bits of repeat count)
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	59 static final int REPZ_11_138=18;
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	60
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	61 // extra bits for each length code
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	62 static final int[] extra_lbits={
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	63 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
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	64 };
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	65
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	66 // extra bits for each distance code
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	67 static final int[] extra_dbits={
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	68 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
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	69 };
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	70
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	71 // extra bits for each bit length code
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	72 static final int[] extra_blbits={
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	73 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	74 };
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	75
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	76 static final byte[] bl_order={
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	77 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	78
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	79
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	80 // The lengths of the bit length codes are sent in order of decreasing
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	81 // probability, to avoid transmitting the lengths for unused bit
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	82 // length codes.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	83
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	84 static final int Buf_size=8*2;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	85
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	86 // see definition of array dist_code below
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	87 static final int DIST_CODE_LEN=512;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	88
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	89 static final byte[] _dist_code = {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	90 0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	91 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	92 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	93 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	94 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	95 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	96 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	97 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	98 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	99 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	100 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	101 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	102 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 0, 0, 16, 17,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	103 18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	104 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	105 24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	106 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	107 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	108 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	109 27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	110 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	111 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	112 28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	113 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	114 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	115 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	116 };
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	117
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	118 static final byte[] _length_code={
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	119 0, 1, 2, 3, 4, 5, 6, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 12, 12,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	120 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	121 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	122 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	123 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	124 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	125 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	126 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	127 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	128 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	129 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	130 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	131 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	132 };
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	133
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	134 static final int[] base_length = {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	135 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	136 64, 80, 96, 112, 128, 160, 192, 224, 0
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	137 };
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	138
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	139 static final int[] base_dist = {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	140 0, 1, 2, 3, 4, 6, 8, 12, 16, 24,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	141 32, 48, 64, 96, 128, 192, 256, 384, 512, 768,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	142 1024, 1536, 2048, 3072, 4096, 6144, 8192, 12288, 16384, 24576
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	143 };
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	144
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	145 // Mapping from a distance to a distance code. dist is the distance - 1 and
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	146 // must not have side effects. _dist_code[256] and _dist_code[257] are never
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	147 // used.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	148 static int d_code(int dist){
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	149 return ((dist) < 256 ? _dist_code[dist] : _dist_code[256+((dist)>>>7)]);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	150 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	151
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	152 short[] dyn_tree; // the dynamic tree
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	153 int max_code; // largest code with non zero frequency
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	154 StaticTree stat_desc; // the corresponding static tree
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	155
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	156 // Compute the optimal bit lengths for a tree and update the total bit length
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	157 // for the current block.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	158 // IN assertion: the fields freq and dad are set, heap[heap_max] and
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	159 // above are the tree nodes sorted by increasing frequency.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	160 // OUT assertions: the field len is set to the optimal bit length, the
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	161 // array bl_count contains the frequencies for each bit length.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	162 // The length opt_len is updated; static_len is also updated if stree is
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	163 // not null.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	164 void gen_bitlen(Deflate s){
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	165 short[] tree = dyn_tree;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	166 short[] stree = stat_desc.static_tree;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	167 int[] extra = stat_desc.extra_bits;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	168 int base = stat_desc.extra_base;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	169 int max_length = stat_desc.max_length;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	170 int h; // heap index
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	171 int n, m; // iterate over the tree elements
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	172 int bits; // bit length
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	173 int xbits; // extra bits
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	174 short f; // frequency
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	175 int overflow = 0; // number of elements with bit length too large
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	176
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	177 for (bits = 0; bits <= MAX_BITS; bits++) s.bl_count[bits] = 0;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	178
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	179 // In a first pass, compute the optimal bit lengths (which may
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	180 // overflow in the case of the bit length tree).
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	181 tree[s.heap[s.heap_max]*2+1] = 0; // root of the heap
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	182
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	183 for(h=s.heap_max+1; h<HEAP_SIZE; h++){
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	184 n = s.heap[h];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	185 bits = tree[tree[n2+1]2+1] + 1;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	186 if (bits > max_length){ bits = max_length; overflow++; }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	187 tree[n*2+1] = (short)bits;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	188 // We overwrite tree[n*2+1] which is no longer needed
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	189
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	190 if (n > max_code) continue; // not a leaf node
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	191
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	192 s.bl_count[bits]++;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	193 xbits = 0;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	194 if (n >= base) xbits = extra[n-base];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	195 f = tree[n*2];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	196 s.opt_len += f * (bits + xbits);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	197 if (stree!=null) s.static_len += f * (stree[n*2+1] + xbits);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	198 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	199 if (overflow == 0) return;
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	200
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	201 // This happens for example on obj2 and pic of the Calgary corpus
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	202 // Find the first bit length which could increase:
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	203 do {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	204 bits = max_length-1;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	205 while(s.bl_count[bits]==0) bits--;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	206 s.bl_count[bits]--; // move one leaf down the tree
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	207 s.bl_count[bits+1]+=2; // move one overflow item as its brother
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	208 s.bl_count[max_length]--;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	209 // The brother of the overflow item also moves one step up,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	210 // but this does not affect bl_count[max_length]
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	211 overflow -= 2;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	212 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	213 while (overflow > 0);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	214
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	215 for (bits = max_length; bits != 0; bits--) {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	216 n = s.bl_count[bits];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	217 while (n != 0) {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	218 m = s.heap[--h];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	219 if (m > max_code) continue;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	220 if (tree[m*2+1] != bits) {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	221 s.opt_len += ((long)bits - (long)tree[m2+1])(long)tree[m*2];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	222 tree[m*2+1] = (short)bits;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	223 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	224 n--;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	225 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	226 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	227 }
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	228
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	229 // Construct one Huffman tree and assigns the code bit strings and lengths.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	230 // Update the total bit length for the current block.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	231 // IN assertion: the field freq is set for all tree elements.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	232 // OUT assertions: the fields len and code are set to the optimal bit length
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	233 // and corresponding code. The length opt_len is updated; static_len is
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	234 // also updated if stree is not null. The field max_code is set.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	235 void build_tree(Deflate s){
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	236 short[] tree=dyn_tree;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	237 short[] stree=stat_desc.static_tree;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	238 int elems=stat_desc.elems;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	239 int n, m; // iterate over heap elements
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	240 int max_code=-1; // largest code with non zero frequency
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	241 int node; // new node being created
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	242
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	243 // Construct the initial heap, with least frequent element in
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	244 // heap[1]. The sons of heap[n] are heap[2n] and heap[2n+1].
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	245 // heap[0] is not used.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	246 s.heap_len = 0;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	247 s.heap_max = HEAP_SIZE;
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	248
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	249 for(n=0; n<elems; n++) {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	250 if(tree[n*2] != 0) {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	251 s.heap[++s.heap_len] = max_code = n;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	252 s.depth[n] = 0;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	253 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	254 else{
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	255 tree[n*2+1] = 0;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	256 }
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	257 }
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	258
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	259 // The pkzip format requires that at least one distance code exists,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	260 // and that at least one bit should be sent even if there is only one
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	261 // possible code. So to avoid special checks later on we force at least
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	262 // two codes of non zero frequency.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	263 while (s.heap_len < 2) {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	264 node = s.heap[++s.heap_len] = (max_code < 2 ? ++max_code : 0);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	265 tree[node*2] = 1;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	266 s.depth[node] = 0;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	267 s.opt_len--; if (stree!=null) s.static_len -= stree[node*2+1];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	268 // node is 0 or 1 so it does not have extra bits
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	269 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	270 this.max_code = max_code;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	271
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	272 // The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	273 // establish sub-heaps of increasing lengths:
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	274
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	275 for(n=s.heap_len/2;n>=1; n--)
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	276 s.pqdownheap(tree, n);
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	277
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	278 // Construct the Huffman tree by repeatedly combining the least two
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	279 // frequent nodes.
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	280
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	281 node=elems; // next internal node of the tree
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	282 do{
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	283 // n = node of least frequency
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	284 n=s.heap[1];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	285 s.heap[1]=s.heap[s.heap_len--];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	286 s.pqdownheap(tree, 1);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	287 m=s.heap[1]; // m = node of next least frequency
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	288
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	289 s.heap[--s.heap_max] = n; // keep the nodes sorted by frequency
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	290 s.heap[--s.heap_max] = m;
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	291
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	292 // Create a new node father of n and m
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	293 tree[node2] = (short)(tree[n2] + tree[m*2]);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	294 s.depth[node] = (byte)(Math.max(s.depth[n],s.depth[m])+1);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	295 tree[n2+1] = tree[m2+1] = (short)node;
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	296
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	297 // and insert the new node in the heap
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	298 s.heap[1] = node++;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	299 s.pqdownheap(tree, 1);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	300 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	301 while(s.heap_len>=2);
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	302
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	303 s.heap[--s.heap_max] = s.heap[1];
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	304
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	305 // At this point, the fields freq and dad are set. We can now
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	306 // generate the bit lengths.
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	307
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	308 gen_bitlen(s);
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	309
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	310 // The field len is now set, we can generate the bit codes
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	311 gen_codes(tree, max_code, s.bl_count, s.next_code);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	312 }
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	313
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	314 // Generate the codes for a given tree and bit counts (which need not be
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	315 // optimal).
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	316 // IN assertion: the array bl_count contains the bit length statistics for
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	317 // the given tree and the field len is set for all tree elements.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	318 // OUT assertion: the field code is set for all tree elements of non
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	319 // zero code length.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	320 private final static void gen_codes(
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	321 short[] tree, // the tree to decorate
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	322 int max_code, // largest code with non zero frequency
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	323 short[] bl_count, // number of codes at each bit length
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	324 short[] next_code){
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	325 short code = 0; // running code value
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	326 int bits; // bit index
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	327 int n; // code index
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	328
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	329 // The distribution counts are first used to generate the code values
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	330 // without bit reversal.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	331 next_code[0]=0;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	332 for (bits = 1; bits <= MAX_BITS; bits++) {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	333 next_code[bits] = code = (short)((code + bl_count[bits-1]) << 1);
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	334 }
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	335
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	336 // Check that the bit counts in bl_count are consistent. The last code
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	337 // must be all ones.
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	338 //Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	339 // "inconsistent bit counts");
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	340 //Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	341
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	342 for (n = 0; n <= max_code; n++) {
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	343 int len = tree[n*2+1];
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	344 if (len == 0) continue;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	345 // Now reverse the bits
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	346 tree[n*2] = (short)(bi_reverse(next_code[len]++, len));
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	347 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	348 }
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	349
357 46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	350 // Reverse the first len bits of a code, using straightforward code (a faster
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	351 // method would use a table)
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	352 // IN assertion: 1 <= len <= 15
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	353 private final static int bi_reverse(
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	354 int code, // the value to invert
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	355 int len // its bit length
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	356 ){
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	357 int res = 0;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	358 do{
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	359 res\|=code&1;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	360 code>>>=1;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	361 res<<=1;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	362 }
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	363 while(--len>0);
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	364 return res>>>1;
46c2115ae1c8 update jzlib to a21be20213d66eff15904d925e9b721956a01ef7 Carl Byington <carl@five-ten-sg.com> parents: 0 diff changeset	365 }
0 0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	366 }
0ce5cc452d02 initial version Carl Byington <carl@five-ten-sg.com> parents: diff changeset	367

Mercurial > 510Connectbot

annotate src/com/jcraft/jzlib/Tree.java @ 435:9c6a269fabb5 stable-1.9.2