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