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annotate app/src/main/java/com/jcraft/jzlib/GZIPHeader.java @ 518:9acc51a5a98f
Added tag stable-1.9.4-6 for changeset 947ea334735d
author | Carl Byington <carl@five-ten-sg.com> |
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date | Fri, 31 May 2024 13:35:44 -0600 |
parents | d29cce60f393 |
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1 /* -*-mode:java; c-basic-offset:2; -*- */ |
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2 /* |
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3 Copyright (c) 2011 ymnk, JCraft,Inc. All rights reserved. |
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4 |
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5 Redistribution and use in source and binary forms, with or without |
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6 modification, are permitted provided that the following conditions are met: |
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7 |
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8 1. Redistributions of source code must retain the above copyright notice, |
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9 this list of conditions and the following disclaimer. |
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10 |
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11 2. Redistributions in binary form must reproduce the above copyright |
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12 notice, this list of conditions and the following disclaimer in |
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13 the documentation and/or other materials provided with the distribution. |
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14 |
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15 3. The names of the authors may not be used to endorse or promote products |
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16 derived from this software without specific prior written permission. |
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17 |
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18 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, |
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19 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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20 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT, |
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21 INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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23 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, |
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24 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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25 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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26 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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27 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 */ |
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29 /* |
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30 * This program is based on zlib-1.1.3, so all credit should go authors |
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31 * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu) |
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32 * and contributors of zlib. |
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33 */ |
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34 |
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35 package com.jcraft.jzlib; |
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36 |
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37 import java.io.UnsupportedEncodingException; |
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38 |
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39 /** |
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40 * @see "http://www.ietf.org/rfc/rfc1952.txt" |
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41 */ |
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42 public class GZIPHeader implements Cloneable { |
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43 |
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44 public static final byte OS_MSDOS = (byte) 0x00; |
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45 public static final byte OS_AMIGA = (byte) 0x01; |
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46 public static final byte OS_VMS = (byte) 0x02; |
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47 public static final byte OS_UNIX = (byte) 0x03; |
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48 public static final byte OS_ATARI = (byte) 0x05; |
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49 public static final byte OS_OS2 = (byte) 0x06; |
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50 public static final byte OS_MACOS = (byte) 0x07; |
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51 public static final byte OS_TOPS20 = (byte) 0x0a; |
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52 public static final byte OS_WIN32 = (byte) 0x0b; |
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53 public static final byte OS_VMCMS = (byte) 0x04; |
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54 public static final byte OS_ZSYSTEM = (byte) 0x08; |
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55 public static final byte OS_CPM = (byte) 0x09; |
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56 public static final byte OS_QDOS = (byte) 0x0c; |
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57 public static final byte OS_RISCOS = (byte) 0x0d; |
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58 public static final byte OS_UNKNOWN = (byte) 0xff; |
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59 |
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60 boolean text = false; |
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61 private boolean fhcrc = false; |
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62 long time; |
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63 int xflags; |
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64 int os = 255; |
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65 byte[] extra; |
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66 byte[] name; |
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67 byte[] comment; |
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68 int hcrc; |
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69 long crc; |
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70 boolean done = false; |
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71 long mtime = 0; |
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72 |
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73 public void setModifiedTime(long mtime) { |
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74 this.mtime = mtime; |
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75 } |
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76 |
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77 public long getModifiedTime() { |
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78 return mtime; |
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79 } |
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80 |
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81 public void setOS(int os) { |
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82 if((0<=os && os <=13) || os==255) |
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83 this.os=os; |
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84 else |
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85 throw new IllegalArgumentException("os: "+os); |
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86 } |
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87 |
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88 public int getOS(){ |
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89 return os; |
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90 } |
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91 |
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92 public void setName(String name) { |
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93 try{ |
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94 this.name=name.getBytes("ISO-8859-1"); |
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95 } |
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96 catch(UnsupportedEncodingException e){ |
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97 throw new IllegalArgumentException("name must be in ISO-8859-1 "+name); |
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98 } |
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99 } |
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100 |
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101 public String getName(){ |
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102 if(name==null) return ""; |
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103 try { |
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104 return new String(name, "ISO-8859-1"); |
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105 } |
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106 catch (UnsupportedEncodingException e) { |
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107 throw new InternalError(e.toString()); |
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108 } |
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109 } |
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110 |
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111 public void setComment(String comment) { |
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112 try{ |
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113 this.comment=comment.getBytes("ISO-8859-1"); |
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114 } |
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115 catch(UnsupportedEncodingException e){ |
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116 throw new IllegalArgumentException("comment must be in ISO-8859-1 "+name); |
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117 } |
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118 } |
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119 |
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120 public String getComment(){ |
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121 if(comment==null) return ""; |
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122 try { |
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123 return new String(comment, "ISO-8859-1"); |
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124 } |
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125 catch (UnsupportedEncodingException e) { |
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126 throw new InternalError(e.toString()); |
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127 } |
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128 } |
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129 |
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130 public void setCRC(long crc){ |
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131 this.crc = crc; |
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132 } |
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133 |
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134 public long getCRC(){ |
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135 return crc; |
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136 } |
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137 |
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138 void put(Deflate d){ |
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139 int flag = 0; |
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140 if(text){ |
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141 flag |= 1; // FTEXT |
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142 } |
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143 if(fhcrc){ |
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144 flag |= 2; // FHCRC |
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145 } |
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146 if(extra!=null){ |
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147 flag |= 4; // FEXTRA |
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148 } |
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149 if(name!=null){ |
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150 flag |= 8; // FNAME |
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151 } |
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152 if(comment!=null){ |
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153 flag |= 16; // FCOMMENT |
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154 } |
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155 int xfl = 0; |
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156 if(d.level == JZlib.Z_BEST_SPEED){ |
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157 xfl |= 4; |
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158 } |
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159 else if (d.level == JZlib.Z_BEST_COMPRESSION){ |
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160 xfl |= 2; |
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161 } |
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162 |
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163 d.put_short((short)0x8b1f); // ID1 ID2 |
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164 d.put_byte((byte)8); // CM(Compression Method) |
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165 d.put_byte((byte)flag); |
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166 d.put_byte((byte)mtime); |
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167 d.put_byte((byte)(mtime>>8)); |
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168 d.put_byte((byte)(mtime>>16)); |
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169 d.put_byte((byte)(mtime>>24)); |
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170 d.put_byte((byte)xfl); |
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171 d.put_byte((byte)os); |
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172 |
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173 if(extra!=null){ |
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174 d.put_byte((byte)extra.length); |
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175 d.put_byte((byte)(extra.length>>8)); |
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176 d.put_byte(extra, 0, extra.length); |
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177 } |
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178 |
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179 if(name!=null){ |
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180 d.put_byte(name, 0, name.length); |
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181 d.put_byte((byte)0); |
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182 } |
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183 |
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184 if(comment!=null){ |
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185 d.put_byte(comment, 0, comment.length); |
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186 d.put_byte((byte)0); |
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187 } |
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188 } |
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189 |
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190 @Override |
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191 public Object clone() throws CloneNotSupportedException { |
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192 GZIPHeader gheader = (GZIPHeader)super.clone(); |
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193 byte[] tmp; |
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194 if(gheader.extra!=null){ |
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195 tmp=new byte[gheader.extra.length]; |
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196 System.arraycopy(gheader.extra, 0, tmp, 0, tmp.length); |
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197 gheader.extra = tmp; |
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198 } |
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199 |
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200 if(gheader.name!=null){ |
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201 tmp=new byte[gheader.name.length]; |
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202 System.arraycopy(gheader.name, 0, tmp, 0, tmp.length); |
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203 gheader.name = tmp; |
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204 } |
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205 |
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206 if(gheader.comment!=null){ |
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207 tmp=new byte[gheader.comment.length]; |
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208 System.arraycopy(gheader.comment, 0, tmp, 0, tmp.length); |
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209 gheader.comment = tmp; |
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210 } |
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211 |
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212 return gheader; |
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213 } |
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214 } |