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[reactos.git] / irc / TechBot / Compression / DeflaterConstants.cs
1 // DeflaterConstants.cs
2 // Copyright (C) 2001 Mike Krueger
3 //
4 // This file was translated from java, it was part of the GNU Classpath
5 // Copyright (C) 2001 Free Software Foundation, Inc.
6 //
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License
9 // as published by the Free Software Foundation; either version 2
10 // of the License, or (at your option) any later version.
11 //
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 //
21 // Linking this library statically or dynamically with other modules is
22 // making a combined work based on this library. Thus, the terms and
23 // conditions of the GNU General Public License cover the whole
24 // combination.
25 //
26 // As a special exception, the copyright holders of this library give you
27 // permission to link this library with independent modules to produce an
28 // executable, regardless of the license terms of these independent
29 // modules, and to copy and distribute the resulting executable under
30 // terms of your choice, provided that you also meet, for each linked
31 // independent module, the terms and conditions of the license of that
32 // module. An independent module is a module which is not derived from
33 // or based on this library. If you modify this library, you may extend
34 // this exception to your version of the library, but you are not
35 // obligated to do so. If you do not wish to do so, delete this
36 // exception statement from your version.
37
38 using System;
39
40 namespace ICSharpCode.SharpZipLib.Zip.Compression
41 {
42
43 /// <summary>
44 /// This class contains constants used for the deflater.
45 /// </summary>
46 public class DeflaterConstants
47 {
48 public const bool DEBUGGING = false;
49
50 public const int STORED_BLOCK = 0;
51 public const int STATIC_TREES = 1;
52 public const int DYN_TREES = 2;
53 public const int PRESET_DICT = 0x20;
54
55 public const int DEFAULT_MEM_LEVEL = 8;
56
57 public const int MAX_MATCH = 258;
58 public const int MIN_MATCH = 3;
59
60 public const int MAX_WBITS = 15;
61 public const int WSIZE = 1 << MAX_WBITS;
62 public const int WMASK = WSIZE - 1;
63
64 public const int HASH_BITS = DEFAULT_MEM_LEVEL + 7;
65 public const int HASH_SIZE = 1 << HASH_BITS;
66 public const int HASH_MASK = HASH_SIZE - 1;
67 public const int HASH_SHIFT = (HASH_BITS + MIN_MATCH - 1) / MIN_MATCH;
68
69 public const int MIN_LOOKAHEAD = MAX_MATCH + MIN_MATCH + 1;
70 public const int MAX_DIST = WSIZE - MIN_LOOKAHEAD;
71
72 public const int PENDING_BUF_SIZE = 1 << (DEFAULT_MEM_LEVEL + 8);
73 public static int MAX_BLOCK_SIZE = Math.Min(65535, PENDING_BUF_SIZE-5);
74
75 public const int DEFLATE_STORED = 0;
76 public const int DEFLATE_FAST = 1;
77 public const int DEFLATE_SLOW = 2;
78
79 public static int[] GOOD_LENGTH = { 0, 4, 4, 4, 4, 8, 8, 8, 32, 32 };
80 public static int[] MAX_LAZY = { 0, 4, 5, 6, 4,16, 16, 32, 128, 258 };
81 public static int[] NICE_LENGTH = { 0, 8,16,32,16,32,128,128, 258, 258 };
82 public static int[] MAX_CHAIN = { 0, 4, 8,32,16,32,128,256,1024,4096 };
83 public static int[] COMPR_FUNC = { 0, 1, 1, 1, 1, 2, 2, 2, 2, 2 };
84 }
85 }