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annotate src/org/eclipse/jetty/server/InclusiveByteRange.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -0600
parents 8e9db0bbf4f9
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.server;
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20
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21 import java.util.Enumeration;
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22 import java.util.List;
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23 import java.util.StringTokenizer;
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24
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25 import org.eclipse.jetty.util.LazyList;
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26 import org.slf4j.Logger;
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27 import org.slf4j.LoggerFactory;
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28
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29 /* ------------------------------------------------------------ */
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30 /** Byte range inclusive of end points.
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31 * <PRE>
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32 *
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33 * parses the following types of byte ranges:
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34 *
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35 * bytes=100-499
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36 * bytes=-300
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37 * bytes=100-
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38 * bytes=1-2,2-3,6-,-2
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39 *
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40 * given an entity length, converts range to string
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41 *
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42 * bytes 100-499/500
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43 *
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44 * </PRE>
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45 *
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46 * Based on RFC2616 3.12, 14.16, 14.35.1, 14.35.2
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47 * @version $version$
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48 *
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49 */
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50 public class InclusiveByteRange
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51 {
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52 private static final Logger LOG = LoggerFactory.getLogger(InclusiveByteRange.class);
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53
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54 long first = 0;
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55 long last = 0;
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56
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57 public InclusiveByteRange(long first, long last)
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58 {
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59 this.first = first;
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60 this.last = last;
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61 }
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62
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63 public long getFirst()
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64 {
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65 return first;
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66 }
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67
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68 public long getLast()
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69 {
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70 return last;
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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 /* ------------------------------------------------------------ */
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76 /**
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77 * @param headers Enumeration of Range header fields.
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78 * @param size Size of the resource.
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79 * @return LazyList of satisfiable ranges
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80 */
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81 public static List satisfiableRanges(Enumeration headers, long size)
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82 {
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83 Object satRanges=null;
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84
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85 // walk through all Range headers
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86 headers:
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87 while (headers.hasMoreElements())
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88 {
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89 String header = (String) headers.nextElement();
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90 StringTokenizer tok = new StringTokenizer(header,"=,",false);
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91 String t=null;
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92 try
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93 {
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94 // read all byte ranges for this header
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95 while (tok.hasMoreTokens())
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96 {
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97 try
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98 {
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99 t = tok.nextToken().trim();
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100
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101 long first = -1;
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102 long last = -1;
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103 int d = t.indexOf('-');
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104 if (d < 0 || t.indexOf("-",d + 1) >= 0)
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105 {
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106 if ("bytes".equals(t))
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107 continue;
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108 LOG.warn("Bad range format: {}",t);
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109 continue headers;
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110 }
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111 else if (d == 0)
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112 {
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113 if (d + 1 < t.length())
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114 last = Long.parseLong(t.substring(d + 1).trim());
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115 else
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116 {
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117 LOG.warn("Bad range format: {}",t);
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118 continue;
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119 }
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120 }
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121 else if (d + 1 < t.length())
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122 {
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123 first = Long.parseLong(t.substring(0,d).trim());
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124 last = Long.parseLong(t.substring(d + 1).trim());
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125 }
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126 else
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127 first = Long.parseLong(t.substring(0,d).trim());
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128
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129 if (first == -1 && last == -1)
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130 continue headers;
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131
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132 if (first != -1 && last != -1 && (first > last))
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133 continue headers;
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134
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135 if (first < size)
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136 {
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137 InclusiveByteRange range = new InclusiveByteRange(first,last);
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138 satRanges = LazyList.add(satRanges,range);
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139 }
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140 }
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141 catch (NumberFormatException e)
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142 {
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143 LOG.warn("Bad range format: {}",t);
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144 LOG.trace("",e);
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145 continue;
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146 }
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147 }
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148 }
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149 catch(Exception e)
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150 {
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151 LOG.warn("Bad range format: {}",t);
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152 LOG.trace("",e);
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153 }
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154 }
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155 return LazyList.getList(satRanges,true);
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156 }
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157
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158 /* ------------------------------------------------------------ */
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159 public long getFirst(long size)
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160 {
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161 if (first<0)
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162 {
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163 long tf=size-last;
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164 if (tf<0)
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165 tf=0;
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166 return tf;
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167 }
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168 return first;
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169 }
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170
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171 /* ------------------------------------------------------------ */
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172 public long getLast(long size)
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173 {
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174 if (first<0)
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175 return size-1;
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176
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177 if (last<0 ||last>=size)
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178 return size-1;
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179 return last;
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180 }
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181
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182 /* ------------------------------------------------------------ */
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183 public long getSize(long size)
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184 {
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185 return getLast(size)-getFirst(size)+1;
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186 }
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187
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188
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189 /* ------------------------------------------------------------ */
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190 public String toHeaderRangeString(long size)
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191 {
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192 StringBuilder sb = new StringBuilder(40);
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193 sb.append("bytes ");
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194 sb.append(getFirst(size));
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195 sb.append('-');
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196 sb.append(getLast(size));
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197 sb.append("/");
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198 sb.append(size);
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199 return sb.toString();
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200 }
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201
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202 /* ------------------------------------------------------------ */
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203 public static String to416HeaderRangeString(long size)
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204 {
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205 StringBuilder sb = new StringBuilder(40);
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206 sb.append("bytes */");
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207 sb.append(size);
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208 return sb.toString();
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209 }
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210
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211
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212 /* ------------------------------------------------------------ */
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213 @Override
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214 public String toString()
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215 {
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216 StringBuilder sb = new StringBuilder(60);
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217 sb.append(Long.toString(first));
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218 sb.append(":");
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219 sb.append(Long.toString(last));
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220 return sb.toString();
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221 }
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222
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223
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224 }
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225
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226
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227