Mercurial > repos > SharpZipLib

annotate Zip/Compression/Streams/OutputWindow.cs @ 1:94e25b786321

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Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller Initial commit of clean SharpZipLib 0860 source. Only change is build paths.
author IBBoard <dev@ibboard.co.uk>
date Sat, 30 Oct 2010 14:03:17 +0000
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children
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1 // OutputWindow.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
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41
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42 namespace ICSharpCode.SharpZipLib.Zip.Compression.Streams
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43 {
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44
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45 /// <summary>
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46 /// Contains the output from the Inflation process.
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47 /// We need to have a window so that we can refer backwards into the output stream
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48 /// to repeat stuff.<br/>
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49 /// Author of the original java version : John Leuner
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50 /// </summary>
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51 public class OutputWindow
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52 {
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53 #region Constants
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54 const int WindowSize = 1 << 15;
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55 const int WindowMask = WindowSize - 1;
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56 #endregion
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57
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58 #region Instance Fields
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59 byte[] window = new byte[WindowSize]; //The window is 2^15 bytes
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60 int windowEnd;
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61 int windowFilled;
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62 #endregion
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63
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64 /// <summary>
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65 /// Write a byte to this output window
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66 /// </summary>
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67 /// <param name="value">value to write</param>
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68 /// <exception cref="InvalidOperationException">
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69 /// if window is full
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70 /// </exception>
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71 public void Write(int value)
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72 {
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73 if (windowFilled++ == WindowSize) {
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74 throw new InvalidOperationException("Window full");
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75 }
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76 window[windowEnd++] = (byte) value;
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77 windowEnd &= WindowMask;
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78 }
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79
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80
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81 private void SlowRepeat(int repStart, int length, int distance)
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82 {
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83 while (length-- > 0) {
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84 window[windowEnd++] = window[repStart++];
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85 windowEnd &= WindowMask;
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86 repStart &= WindowMask;
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87 }
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88 }
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89
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90 /// <summary>
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91 /// Append a byte pattern already in the window itself
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92 /// </summary>
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93 /// <param name="length">length of pattern to copy</param>
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94 /// <param name="distance">distance from end of window pattern occurs</param>
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95 /// <exception cref="InvalidOperationException">
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96 /// If the repeated data overflows the window
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97 /// </exception>
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98 public void Repeat(int length, int distance)
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99 {
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100 if ((windowFilled += length) > WindowSize) {
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101 throw new InvalidOperationException("Window full");
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102 }
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103
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104 int repStart = (windowEnd - distance) & WindowMask;
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105 int border = WindowSize - length;
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106 if ( (repStart <= border) && (windowEnd < border) ) {
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107 if (length <= distance) {
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108 System.Array.Copy(window, repStart, window, windowEnd, length);
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109 windowEnd += length;
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110 } else {
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111 // We have to copy manually, since the repeat pattern overlaps.
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112 while (length-- > 0) {
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113 window[windowEnd++] = window[repStart++];
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114 }
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115 }
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116 } else {
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117 SlowRepeat(repStart, length, distance);
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118 }
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119 }
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120
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121 /// <summary>
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122 /// Copy from input manipulator to internal window
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123 /// </summary>
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124 /// <param name="input">source of data</param>
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125 /// <param name="length">length of data to copy</param>
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126 /// <returns>the number of bytes copied</returns>
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127 public int CopyStored(StreamManipulator input, int length)
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128 {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
129 length = Math.Min(Math.Min(length, WindowSize - windowFilled), input.AvailableBytes);
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IBBoard <dev@ibboard.co.uk>
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diff changeset
130 int copied;
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131
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132 int tailLen = WindowSize - windowEnd;
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133 if (length > tailLen) {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
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diff changeset
134 copied = input.CopyBytes(window, windowEnd, tailLen);
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
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parents:
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135 if (copied == tailLen) {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
136 copied += input.CopyBytes(window, 0, length - tailLen);
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parents:
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137 }
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IBBoard <dev@ibboard.co.uk>
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138 } else {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
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139 copied = input.CopyBytes(window, windowEnd, length);
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140 }
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141
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142 windowEnd = (windowEnd + copied) & WindowMask;
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IBBoard <dev@ibboard.co.uk>
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143 windowFilled += copied;
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IBBoard <dev@ibboard.co.uk>
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144 return copied;
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IBBoard <dev@ibboard.co.uk>
parents:
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145 }
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IBBoard <dev@ibboard.co.uk>
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146
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parents:
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147 /// <summary>
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148 /// Copy dictionary to window
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parents:
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149 /// </summary>
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parents:
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150 /// <param name="dictionary">source dictionary</param>
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parents:
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151 /// <param name="offset">offset of start in source dictionary</param>
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152 /// <param name="length">length of dictionary</param>
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153 /// <exception cref="InvalidOperationException">
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154 /// If window isnt empty
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IBBoard <dev@ibboard.co.uk>
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155 /// </exception>
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
156 public void CopyDict(byte[] dictionary, int offset, int length)
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157 {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
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158 if ( dictionary == null ) {
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159 throw new ArgumentNullException("dictionary");
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parents:
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160 }
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161
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parents:
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162 if (windowFilled > 0) {
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parents:
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163 throw new InvalidOperationException();
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parents:
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164 }
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parents:
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165
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IBBoard <dev@ibboard.co.uk>
parents:
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166 if (length > WindowSize) {
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
167 offset += length - WindowSize;
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parents:
diff changeset
168 length = WindowSize;
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IBBoard <dev@ibboard.co.uk>
parents:
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169 }
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
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parents:
diff changeset
170 System.Array.Copy(dictionary, offset, window, 0, length);
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
171 windowEnd = length & WindowMask;
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IBBoard <dev@ibboard.co.uk>
parents:
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172 }
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parents:
diff changeset
173
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parents:
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174 /// <summary>
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parents:
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175 /// Get remaining unfilled space in window
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parents:
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176 /// </summary>
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parents:
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177 /// <returns>Number of bytes left in window</returns>
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parents:
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178 public int GetFreeSpace()
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parents:
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179 {
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parents:
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180 return WindowSize - windowFilled;
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IBBoard <dev@ibboard.co.uk>
parents:
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181 }
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parents:
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182
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
183 /// <summary>
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IBBoard <dev@ibboard.co.uk>
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diff changeset
184 /// Get bytes available for output in window
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IBBoard <dev@ibboard.co.uk>
parents:
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185 /// </summary>
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IBBoard <dev@ibboard.co.uk>
parents:
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186 /// <returns>Number of bytes filled</returns>
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IBBoard <dev@ibboard.co.uk>
parents:
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187 public int GetAvailable()
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188 {
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parents:
diff changeset
189 return windowFilled;
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parents:
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190 }
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parents:
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191
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
192 /// <summary>
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parents:
diff changeset
193 /// Copy contents of window to output
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parents:
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194 /// </summary>
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parents:
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195 /// <param name="output">buffer to copy to</param>
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parents:
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196 /// <param name="offset">offset to start at</param>
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parents:
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197 /// <param name="len">number of bytes to count</param>
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198 /// <returns>The number of bytes copied</returns>
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199 /// <exception cref="InvalidOperationException">
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parents:
diff changeset
200 /// If a window underflow occurs
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
201 /// </exception>
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parents:
diff changeset
202 public int CopyOutput(byte[] output, int offset, int len)
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parents:
diff changeset
203 {
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
204 int copyEnd = windowEnd;
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
205 if (len > windowFilled) {
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
206 len = windowFilled;
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
207 } else {
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parents:
diff changeset
208 copyEnd = (windowEnd - windowFilled + len) & WindowMask;
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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
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
211 int copied = len;
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
212 int tailLen = len - copyEnd;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
213
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
214 if (tailLen > 0) {
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
215 System.Array.Copy(window, WindowSize - tailLen, output, offset, tailLen);
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
216 offset += tailLen;
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
217 len = copyEnd;
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
218 }
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 System.Array.Copy(window, copyEnd - len, output, offset, len);
94e25b786321 Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
220 windowFilled -= copied;
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
221 if (windowFilled < 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
222 throw new InvalidOperationException();
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
223 }
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 return copied;
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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
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parents:
diff changeset
226
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
227 /// <summary>
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parents:
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228 /// Reset by clearing window so <see cref="GetAvailable">GetAvailable</see> returns 0
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
229 /// </summary>
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
230 public void Reset()
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
231 {
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parents:
diff changeset
232 windowFilled = windowEnd = 0;
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IBBoard <dev@ibboard.co.uk>
parents:
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233 }
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
234 }
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
235 }