Mercurial > repos > SharpZipLib

annotate Zip/Compression/DeflaterConstants.cs @ 10:627dcbca86fc default tip

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* Update standard .csproj with MonoDevelop-initiated cleanup * Add Mono for Android version of .csproj file
author IBBoard <dev@ibboard.co.uk>
date Sat, 14 Jul 2012 15:25:26 +0100
parents 94e25b786321
children
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1
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1 // DeflaterConstants.cs
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2 //
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3 // Copyright (C) 2001 Mike Krueger
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4 // Copyright (C) 2004 John Reilly
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5 //
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6 // This file was translated from java, it was part of the GNU Classpath
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7 // Copyright (C) 2001 Free Software Foundation, Inc.
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8 //
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9 // This program is free software; you can redistribute it and/or
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10 // modify it under the terms of the GNU General Public License
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11 // as published by the Free Software Foundation; either version 2
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12 // of the License, or (at your option) any later version.
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13 //
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14 // This program is distributed in the hope that it will be useful,
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15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 // GNU General Public License for more details.
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18 //
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19 // You should have received a copy of the GNU General Public License
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20 // along with this program; if not, write to the Free Software
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21 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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22 //
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23 // Linking this library statically or dynamically with other modules is
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24 // making a combined work based on this library. Thus, the terms and
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25 // conditions of the GNU General Public License cover the whole
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26 // combination.
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27 //
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28 // As a special exception, the copyright holders of this library give you
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29 // permission to link this library with independent modules to produce an
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30 // executable, regardless of the license terms of these independent
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31 // modules, and to copy and distribute the resulting executable under
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32 // terms of your choice, provided that you also meet, for each linked
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33 // independent module, the terms and conditions of the license of that
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34 // module. An independent module is a module which is not derived from
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35 // or based on this library. If you modify this library, you may extend
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36 // this exception to your version of the library, but you are not
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37 // obligated to do so. If you do not wish to do so, delete this
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38 // exception statement from your version.
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39
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40 using System;
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41
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42 namespace ICSharpCode.SharpZipLib.Zip.Compression
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43 {
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44
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45 /// <summary>
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46 /// This class contains constants used for deflation.
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47 /// </summary>
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48 public class DeflaterConstants
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49 {
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50 /// <summary>
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51 /// Set to true to enable debugging
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52 /// </summary>
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53 public const bool DEBUGGING = false;
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54
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55 /// <summary>
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56 /// Written to Zip file to identify a stored block
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57 /// </summary>
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58 public const int STORED_BLOCK = 0;
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59
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60 /// <summary>
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61 /// Identifies static tree in Zip file
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62 /// </summary>
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63 public const int STATIC_TREES = 1;
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64
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65 /// <summary>
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66 /// Identifies dynamic tree in Zip file
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67 /// </summary>
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68 public const int DYN_TREES = 2;
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69
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70 /// <summary>
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71 /// Header flag indicating a preset dictionary for deflation
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72 /// </summary>
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73 public const int PRESET_DICT = 0x20;
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74
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75 /// <summary>
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76 /// Sets internal buffer sizes for Huffman encoding
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77 /// </summary>
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78 public const int DEFAULT_MEM_LEVEL = 8;
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79
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80 /// <summary>
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81 /// Internal compression engine constant
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82 /// </summary>
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83 public const int MAX_MATCH = 258;
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84
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85 /// <summary>
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86 /// Internal compression engine constant
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87 /// </summary>
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88 public const int MIN_MATCH = 3;
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89
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90 /// <summary>
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91 /// Internal compression engine constant
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92 /// </summary>
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93 public const int MAX_WBITS = 15;
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94
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95 /// <summary>
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96 /// Internal compression engine constant
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97 /// </summary>
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98 public const int WSIZE = 1 << MAX_WBITS;
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99
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100 /// <summary>
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101 /// Internal compression engine constant
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102 /// </summary>
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103 public const int WMASK = WSIZE - 1;
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104
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105 /// <summary>
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106 /// Internal compression engine constant
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107 /// </summary>
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108 public const int HASH_BITS = DEFAULT_MEM_LEVEL + 7;
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109
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110 /// <summary>
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111 /// Internal compression engine constant
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112 /// </summary>
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113 public const int HASH_SIZE = 1 << HASH_BITS;
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114
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115 /// <summary>
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116 /// Internal compression engine constant
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117 /// </summary>
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118 public const int HASH_MASK = HASH_SIZE - 1;
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119
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120 /// <summary>
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121 /// Internal compression engine constant
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122 /// </summary>
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123 public const int HASH_SHIFT = (HASH_BITS + MIN_MATCH - 1) / MIN_MATCH;
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124
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125 /// <summary>
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126 /// Internal compression engine constant
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127 /// </summary>
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128 public const int MIN_LOOKAHEAD = MAX_MATCH + MIN_MATCH + 1;
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129
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130 /// <summary>
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131 /// Internal compression engine constant
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132 /// </summary>
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133 public const int MAX_DIST = WSIZE - MIN_LOOKAHEAD;
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134
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135 /// <summary>
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136 /// Internal compression engine constant
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137 /// </summary>
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138 public const int PENDING_BUF_SIZE = 1 << (DEFAULT_MEM_LEVEL + 8);
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139
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140 /// <summary>
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141 /// Internal compression engine constant
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142 /// </summary>
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143 public static int MAX_BLOCK_SIZE = Math.Min(65535, PENDING_BUF_SIZE - 5);
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144
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145 /// <summary>
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146 /// Internal compression engine constant
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147 /// </summary>
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148 public const int DEFLATE_STORED = 0;
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149
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150 /// <summary>
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151 /// Internal compression engine constant
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152 /// </summary>
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153 public const int DEFLATE_FAST = 1;
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154
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155 /// <summary>
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156 /// Internal compression engine constant
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157 /// </summary>
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158 public const int DEFLATE_SLOW = 2;
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159
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160 /// <summary>
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161 /// Internal compression engine constant
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162 /// </summary>
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163 public static int[] GOOD_LENGTH = { 0, 4, 4, 4, 4, 8, 8, 8, 32, 32 };
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164
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165 /// <summary>
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166 /// Internal compression engine constant
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167 /// </summary>
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168 public static int[] MAX_LAZY = { 0, 4, 5, 6, 4, 16, 16, 32, 128, 258 };
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169
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170 /// <summary>
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171 /// Internal compression engine constant
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172 /// </summary>
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173 public static int[] NICE_LENGTH = { 0, 8, 16, 32, 16, 32, 128, 128, 258, 258 };
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174
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175 /// <summary>
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176 /// Internal compression engine constant
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177 /// </summary>
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178 public static int[] MAX_CHAIN = { 0, 4, 8, 32, 16, 32, 128, 256, 1024, 4096 };
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179
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180 /// <summary>
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181 /// Internal compression engine constant
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182 /// </summary>
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183 public static int[] COMPR_FUNC = { 0, 1, 1, 1, 1, 2, 2, 2, 2, 2 };
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184
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185 }
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186 }