Mercurial > repos > SharpZipLib

annotate GZip/GzipOutputStream.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 // GZipOutputStream.cs
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2 //
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3 // Copyright (C) 2001 Mike Krueger
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4 //
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5 // This file was translated from java, it was part of the GNU Classpath
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6 // Copyright (C) 2001 Free Software Foundation, Inc.
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7 //
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8 // This program is free software; you can redistribute it and/or
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9 // modify it under the terms of the GNU General Public License
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10 // as published by the Free Software Foundation; either version 2
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11 // of the License, or (at your option) any later version.
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12 //
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13 // This program is distributed in the hope that it will be useful,
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14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 // GNU General Public License for more details.
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17 //
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18 // You should have received a copy of the GNU General Public License
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19 // along with this program; if not, write to the Free Software
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20 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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21 //
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22 // Linking this library statically or dynamically with other modules is
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23 // making a combined work based on this library. Thus, the terms and
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24 // conditions of the GNU General Public License cover the whole
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25 // combination.
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26 //
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27 // As a special exception, the copyright holders of this library give you
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28 // permission to link this library with independent modules to produce an
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29 // executable, regardless of the license terms of these independent
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30 // modules, and to copy and distribute the resulting executable under
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31 // terms of your choice, provided that you also meet, for each linked
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32 // independent module, the terms and conditions of the license of that
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33 // module. An independent module is a module which is not derived from
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34 // or based on this library. If you modify this library, you may extend
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35 // this exception to your version of the library, but you are not
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36 // obligated to do so. If you do not wish to do so, delete this
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37 // exception statement from your version.
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38
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39 using System;
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40 using System.IO;
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41
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42 using ICSharpCode.SharpZipLib.Checksums;
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43 using ICSharpCode.SharpZipLib.Zip.Compression;
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44 using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
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45
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46 namespace ICSharpCode.SharpZipLib.GZip
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47 {
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48
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49 /// <summary>
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50 /// This filter stream is used to compress a stream into a "GZIP" stream.
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51 /// The "GZIP" format is described in RFC 1952.
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52 ///
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53 /// author of the original java version : John Leuner
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54 /// </summary>
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55 /// <example> This sample shows how to gzip a file
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56 /// <code>
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57 /// using System;
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58 /// using System.IO;
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59 ///
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60 /// using ICSharpCode.SharpZipLib.GZip;
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61 /// using ICSharpCode.SharpZipLib.Core;
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62 ///
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63 /// class MainClass
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64 /// {
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65 /// public static void Main(string[] args)
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66 /// {
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67 /// using (Stream s = new GZipOutputStream(File.Create(args[0] + ".gz")))
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68 /// using (FileStream fs = File.OpenRead(args[0])) {
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69 /// byte[] writeData = new byte[4096];
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70 /// Streamutils.Copy(s, fs, writeData);
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71 /// }
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72 /// }
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73 /// }
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74 /// }
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75 /// </code>
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76 /// </example>
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77 public class GZipOutputStream : DeflaterOutputStream
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78 {
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79 enum OutputState
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80 {
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81 Header,
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82 Footer,
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83 Finished,
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84 Closed,
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85 };
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86
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87 #region Instance Fields
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88 /// <summary>
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89 /// CRC-32 value for uncompressed data
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90 /// </summary>
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91 protected Crc32 crc = new Crc32();
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92 OutputState state_ = OutputState.Header;
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93 #endregion
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94
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95 #region Constructors
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96 /// <summary>
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97 /// Creates a GzipOutputStream with the default buffer size
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98 /// </summary>
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99 /// <param name="baseOutputStream">
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100 /// The stream to read data (to be compressed) from
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101 /// </param>
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102 public GZipOutputStream(Stream baseOutputStream)
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103 : this(baseOutputStream, 4096)
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104 {
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105 }
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106
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107 /// <summary>
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108 /// Creates a GZipOutputStream with the specified buffer size
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109 /// </summary>
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110 /// <param name="baseOutputStream">
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111 /// The stream to read data (to be compressed) from
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112 /// </param>
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113 /// <param name="size">
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114 /// Size of the buffer to use
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115 /// </param>
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116 public GZipOutputStream(Stream baseOutputStream, int size) : base(baseOutputStream, new Deflater(Deflater.DEFAULT_COMPRESSION, true), size)
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117 {
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118 }
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119 #endregion
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120
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121 #region Public API
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122 /// <summary>
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123 /// Sets the active compression level (1-9). The new level will be activated
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124 /// immediately.
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125 /// </summary>
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126 /// <param name="level">The compression level to set.</param>
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127 /// <exception cref="ArgumentOutOfRangeException">
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128 /// Level specified is not supported.
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
129 /// </exception>
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
130 /// <see cref="Deflater"/>
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
131 public void SetLevel(int level)
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parents:
diff changeset
132 {
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parents:
diff changeset
133 if (level < Deflater.BEST_SPEED) {
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
134 throw new ArgumentOutOfRangeException("level");
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
135 }
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
136 deflater_.SetLevel(level);
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
137 }
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
138
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
139 /// <summary>
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
140 /// Get the current compression level.
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
141 /// </summary>
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
142 /// <returns>The current compression level.</returns>
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
143 public int GetLevel()
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IBBoard <dev@ibboard.co.uk>
parents:
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144 {
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
145 return deflater_.GetLevel();
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
146 }
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
147 #endregion
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IBBoard <dev@ibboard.co.uk>
parents:
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148
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
149 #region Stream overrides
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IBBoard <dev@ibboard.co.uk>
parents:
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150 /// <summary>
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IBBoard <dev@ibboard.co.uk>
parents:
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151 /// Write given buffer to output updating crc
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parents:
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152 /// </summary>
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parents:
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153 /// <param name="buffer">Buffer to write</param>
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parents:
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154 /// <param name="offset">Offset of first byte in buf to write</param>
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parents:
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155 /// <param name="count">Number of bytes to write</param>
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parents:
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156 public override void Write(byte[] buffer, int offset, int count)
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parents:
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157 {
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parents:
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158 if ( state_ == OutputState.Header ) {
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parents:
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159 WriteHeader();
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parents:
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160 }
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parents:
diff changeset
161
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parents:
diff changeset
162 if( state_!=OutputState.Footer )
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parents:
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163 {
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parents:
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164 throw new InvalidOperationException("Write not permitted in current state");
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parents:
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165 }
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parents:
diff changeset
166
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
167 crc.Update(buffer, offset, count);
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parents:
diff changeset
168 base.Write(buffer, offset, count);
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parents:
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169 }
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parents:
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170
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IBBoard <dev@ibboard.co.uk>
parents:
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171 /// <summary>
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parents:
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172 /// Writes remaining compressed output data to the output stream
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parents:
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173 /// and closes it.
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IBBoard <dev@ibboard.co.uk>
parents:
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174 /// </summary>
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
175 public override void Close()
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
176 {
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parents:
diff changeset
177 try {
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parents:
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178 Finish();
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parents:
diff changeset
179 }
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parents:
diff changeset
180 finally {
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parents:
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181 if ( state_ != OutputState.Closed ) {
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parents:
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182 state_ = OutputState.Closed;
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
183 if( IsStreamOwner ) {
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
184 baseOutputStream_.Close();
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parents:
diff changeset
185 }
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parents:
diff changeset
186 }
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
187 }
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IBBoard <dev@ibboard.co.uk>
parents:
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188 }
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
189 #endregion
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parents:
diff changeset
190
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parents:
diff changeset
191 #region DeflaterOutputStream overrides
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
192 /// <summary>
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parents:
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193 /// Finish compression and write any footer information required to stream
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parents:
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194 /// </summary>
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parents:
diff changeset
195 public override void Finish()
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parents:
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196 {
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parents:
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197 // If no data has been written a header should be added.
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parents:
diff changeset
198 if ( state_ == OutputState.Header ) {
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parents:
diff changeset
199 WriteHeader();
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parents:
diff changeset
200 }
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
201
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
202 if( state_ == OutputState.Footer)
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
203 {
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
204 state_=OutputState.Finished;
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
205 base.Finish();
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
206
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
207 uint totalin=(uint)(deflater_.TotalIn&0xffffffff);
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
208 uint crcval=(uint)(crc.Value&0xffffffff);
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
209
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
210 byte[] gzipFooter;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
211
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
212 unchecked
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
213 {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
214 gzipFooter=new byte[] {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
215 (byte) crcval, (byte) (crcval >> 8),
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
216 (byte) (crcval >> 16), (byte) (crcval >> 24),
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
217
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
218 (byte) totalin, (byte) (totalin >> 8),
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
219 (byte) (totalin >> 16), (byte) (totalin >> 24)
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
220 };
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
221 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
222
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
223 baseOutputStream_.Write(gzipFooter, 0, gzipFooter.Length);
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
224 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
225 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
226 #endregion
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parents:
diff changeset
227
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
228 #region Support Routines
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
229 void WriteHeader()
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
230 {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
231 if ( state_ == OutputState.Header )
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
232 {
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parents:
diff changeset
233 state_=OutputState.Footer;
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
234
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
235 int mod_time = (int)((DateTime.Now.Ticks - new DateTime(1970, 1, 1).Ticks) / 10000000L); // Ticks give back 100ns intervals
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
236 byte[] gzipHeader = {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
237 // The two magic bytes
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
238 (byte) (GZipConstants.GZIP_MAGIC >> 8), (byte) (GZipConstants.GZIP_MAGIC & 0xff),
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
239
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
240 // The compression type
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
241 (byte) Deflater.DEFLATED,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
242
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
243 // The flags (not set)
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
244 0,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
245
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
246 // The modification time
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
247 (byte) mod_time, (byte) (mod_time >> 8),
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
248 (byte) (mod_time >> 16), (byte) (mod_time >> 24),
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
249
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
250 // The extra flags
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
251 0,
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
252
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
253 // The OS type (unknown)
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
254 (byte) 255
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
255 };
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
256 baseOutputStream_.Write(gzipHeader, 0, gzipHeader.Length);
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
257 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
258 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
259 #endregion
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
260 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
261 }