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| <pre><span class="sourceLineNo">001</span><a id="line.1">/*</a> |
| <span class="sourceLineNo">002</span><a id="line.2"> * Licensed to the Apache Software Foundation (ASF) under one</a> |
| <span class="sourceLineNo">003</span><a id="line.3"> * or more contributor license agreements. See the NOTICE file</a> |
| <span class="sourceLineNo">004</span><a id="line.4"> * distributed with this work for additional information</a> |
| <span class="sourceLineNo">005</span><a id="line.5"> * regarding copyright ownership. The ASF licenses this file</a> |
| <span class="sourceLineNo">006</span><a id="line.6"> * to you under the Apache License, Version 2.0 (the</a> |
| <span class="sourceLineNo">007</span><a id="line.7"> * "License"); you may not use this file except in compliance</a> |
| <span class="sourceLineNo">008</span><a id="line.8"> * with the License. You may obtain a copy of the License at</a> |
| <span class="sourceLineNo">009</span><a id="line.9"> *</a> |
| <span class="sourceLineNo">010</span><a id="line.10"> * http://www.apache.org/licenses/LICENSE-2.0</a> |
| <span class="sourceLineNo">011</span><a id="line.11"> *</a> |
| <span class="sourceLineNo">012</span><a id="line.12"> * Unless required by applicable law or agreed to in writing,</a> |
| <span class="sourceLineNo">013</span><a id="line.13"> * software distributed under the License is distributed on an</a> |
| <span class="sourceLineNo">014</span><a id="line.14"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</a> |
| <span class="sourceLineNo">015</span><a id="line.15"> * KIND, either express or implied. See the License for the</a> |
| <span class="sourceLineNo">016</span><a id="line.16"> * specific language governing permissions and limitations</a> |
| <span class="sourceLineNo">017</span><a id="line.17"> * under the License.</a> |
| <span class="sourceLineNo">018</span><a id="line.18"> */</a> |
| <span class="sourceLineNo">019</span><a id="line.19">package org.apache.shiro.codec;</a> |
| <span class="sourceLineNo">020</span><a id="line.20"></a> |
| <span class="sourceLineNo">021</span><a id="line.21">/**</a> |
| <span class="sourceLineNo">022</span><a id="line.22"> * Provides <a href="http://en.wikipedia.org/wiki/Base64">Base 64</a> encoding and decoding as defined by</a> |
| <span class="sourceLineNo">023</span><a id="line.23"> * <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>.</a> |
| <span class="sourceLineNo">024</span><a id="line.24"> * <p/></a> |
| <span class="sourceLineNo">025</span><a id="line.25"> * This class implements section <cite>6.8. Base64 Content-Transfer-Encoding</cite> from RFC 2045 <cite>Multipurpose</a> |
| <span class="sourceLineNo">026</span><a id="line.26"> * Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies</cite> by Freed and Borenstein.</a> |
| <span class="sourceLineNo">027</span><a id="line.27"> * <p/></a> |
| <span class="sourceLineNo">028</span><a id="line.28"> * This class was borrowed from Apache Commons Codec SVN repository (rev. 618419) with modifications</a> |
| <span class="sourceLineNo">029</span><a id="line.29"> * to enable Base64 conversion without a full dependency on Commons Codec. We didn't want to reinvent the wheel of</a> |
| <span class="sourceLineNo">030</span><a id="line.30"> * great work they've done, but also didn't want to force every Shiro user to depend on the commons-codec.jar</a> |
| <span class="sourceLineNo">031</span><a id="line.31"> * <p/></a> |
| <span class="sourceLineNo">032</span><a id="line.32"> * As per the Apache 2.0 license, the original copyright notice and all author and copyright information have</a> |
| <span class="sourceLineNo">033</span><a id="line.33"> * remained in tact.</a> |
| <span class="sourceLineNo">034</span><a id="line.34"> *</a> |
| <span class="sourceLineNo">035</span><a id="line.35"> * @see <a href="http://en.wikipedia.org/wiki/Base64">Wikipedia: Base 64</a></a> |
| <span class="sourceLineNo">036</span><a id="line.36"> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a></a> |
| <span class="sourceLineNo">037</span><a id="line.37"> * @since 0.9</a> |
| <span class="sourceLineNo">038</span><a id="line.38"> */</a> |
| <span class="sourceLineNo">039</span><a id="line.39">public class Base64 {</a> |
| <span class="sourceLineNo">040</span><a id="line.40"></a> |
| <span class="sourceLineNo">041</span><a id="line.41"> /**</a> |
| <span class="sourceLineNo">042</span><a id="line.42"> * Chunk size per RFC 2045 section 6.8.</a> |
| <span class="sourceLineNo">043</span><a id="line.43"> * <p/></a> |
| <span class="sourceLineNo">044</span><a id="line.44"> * The character limit does not count the trailing CRLF, but counts all other characters, including any</a> |
| <span class="sourceLineNo">045</span><a id="line.45"> * equal signs.</a> |
| <span class="sourceLineNo">046</span><a id="line.46"> *</a> |
| <span class="sourceLineNo">047</span><a id="line.47"> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 6.8</a></a> |
| <span class="sourceLineNo">048</span><a id="line.48"> */</a> |
| <span class="sourceLineNo">049</span><a id="line.49"> static final int CHUNK_SIZE = 76;</a> |
| <span class="sourceLineNo">050</span><a id="line.50"></a> |
| <span class="sourceLineNo">051</span><a id="line.51"> /**</a> |
| <span class="sourceLineNo">052</span><a id="line.52"> * Chunk separator per RFC 2045 section 2.1.</a> |
| <span class="sourceLineNo">053</span><a id="line.53"> *</a> |
| <span class="sourceLineNo">054</span><a id="line.54"> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a></a> |
| <span class="sourceLineNo">055</span><a id="line.55"> */</a> |
| <span class="sourceLineNo">056</span><a id="line.56"> static final byte[] CHUNK_SEPARATOR = "\r\n".getBytes();</a> |
| <span class="sourceLineNo">057</span><a id="line.57"></a> |
| <span class="sourceLineNo">058</span><a id="line.58"> /**</a> |
| <span class="sourceLineNo">059</span><a id="line.59"> * The base length.</a> |
| <span class="sourceLineNo">060</span><a id="line.60"> */</a> |
| <span class="sourceLineNo">061</span><a id="line.61"> private static final int BASELENGTH = 255;</a> |
| <span class="sourceLineNo">062</span><a id="line.62"></a> |
| <span class="sourceLineNo">063</span><a id="line.63"> /**</a> |
| <span class="sourceLineNo">064</span><a id="line.64"> * Lookup length.</a> |
| <span class="sourceLineNo">065</span><a id="line.65"> */</a> |
| <span class="sourceLineNo">066</span><a id="line.66"> private static final int LOOKUPLENGTH = 64;</a> |
| <span class="sourceLineNo">067</span><a id="line.67"></a> |
| <span class="sourceLineNo">068</span><a id="line.68"> /**</a> |
| <span class="sourceLineNo">069</span><a id="line.69"> * Used to calculate the number of bits in a byte.</a> |
| <span class="sourceLineNo">070</span><a id="line.70"> */</a> |
| <span class="sourceLineNo">071</span><a id="line.71"> private static final int EIGHTBIT = 8;</a> |
| <span class="sourceLineNo">072</span><a id="line.72"></a> |
| <span class="sourceLineNo">073</span><a id="line.73"> /**</a> |
| <span class="sourceLineNo">074</span><a id="line.74"> * Used when encoding something which has fewer than 24 bits.</a> |
| <span class="sourceLineNo">075</span><a id="line.75"> */</a> |
| <span class="sourceLineNo">076</span><a id="line.76"> private static final int SIXTEENBIT = 16;</a> |
| <span class="sourceLineNo">077</span><a id="line.77"></a> |
| <span class="sourceLineNo">078</span><a id="line.78"> /**</a> |
| <span class="sourceLineNo">079</span><a id="line.79"> * Used to determine how many bits data contains.</a> |
| <span class="sourceLineNo">080</span><a id="line.80"> */</a> |
| <span class="sourceLineNo">081</span><a id="line.81"> private static final int TWENTYFOURBITGROUP = 24;</a> |
| <span class="sourceLineNo">082</span><a id="line.82"></a> |
| <span class="sourceLineNo">083</span><a id="line.83"> /**</a> |
| <span class="sourceLineNo">084</span><a id="line.84"> * Used to get the number of Quadruples.</a> |
| <span class="sourceLineNo">085</span><a id="line.85"> */</a> |
| <span class="sourceLineNo">086</span><a id="line.86"> private static final int FOURBYTE = 4;</a> |
| <span class="sourceLineNo">087</span><a id="line.87"></a> |
| <span class="sourceLineNo">088</span><a id="line.88"> /**</a> |
| <span class="sourceLineNo">089</span><a id="line.89"> * Used to test the sign of a byte.</a> |
| <span class="sourceLineNo">090</span><a id="line.90"> */</a> |
| <span class="sourceLineNo">091</span><a id="line.91"> private static final int SIGN = -128;</a> |
| <span class="sourceLineNo">092</span><a id="line.92"></a> |
| <span class="sourceLineNo">093</span><a id="line.93"> /**</a> |
| <span class="sourceLineNo">094</span><a id="line.94"> * Byte used to pad output.</a> |
| <span class="sourceLineNo">095</span><a id="line.95"> */</a> |
| <span class="sourceLineNo">096</span><a id="line.96"> private static final byte PAD = (byte) '=';</a> |
| <span class="sourceLineNo">097</span><a id="line.97"></a> |
| <span class="sourceLineNo">098</span><a id="line.98"> /**</a> |
| <span class="sourceLineNo">099</span><a id="line.99"> * Contains the Base64 values <code>0</code> through <code>63</code> accessed by using character encodings as</a> |
| <span class="sourceLineNo">100</span><a id="line.100"> * indices.</a> |
| <span class="sourceLineNo">101</span><a id="line.101"> * <p/></a> |
| <span class="sourceLineNo">102</span><a id="line.102"> * <p>For example, <code>base64Alphabet['+']</code> returns <code>62</code>.</p></a> |
| <span class="sourceLineNo">103</span><a id="line.103"> * <p/></a> |
| <span class="sourceLineNo">104</span><a id="line.104"> * <p>The value of undefined encodings is <code>-1</code>.</p></a> |
| <span class="sourceLineNo">105</span><a id="line.105"> */</a> |
| <span class="sourceLineNo">106</span><a id="line.106"> private static final byte[] base64Alphabet = new byte[BASELENGTH];</a> |
| <span class="sourceLineNo">107</span><a id="line.107"></a> |
| <span class="sourceLineNo">108</span><a id="line.108"> /**</a> |
| <span class="sourceLineNo">109</span><a id="line.109"> * <p>Contains the Base64 encodings <code>A</code> through <code>Z</code>, followed by <code>a</code> through</a> |
| <span class="sourceLineNo">110</span><a id="line.110"> * <code>z</code>, followed by <code>0</code> through <code>9</code>, followed by <code>+</code>, and</a> |
| <span class="sourceLineNo">111</span><a id="line.111"> * <code>/</code>.</p></a> |
| <span class="sourceLineNo">112</span><a id="line.112"> * <p/></a> |
| <span class="sourceLineNo">113</span><a id="line.113"> * <p>This array is accessed by using character values as indices.</p></a> |
| <span class="sourceLineNo">114</span><a id="line.114"> * <p/></a> |
| <span class="sourceLineNo">115</span><a id="line.115"> * <p>For example, <code>lookUpBase64Alphabet[62] </code> returns <code>'+'</code>.</p></a> |
| <span class="sourceLineNo">116</span><a id="line.116"> */</a> |
| <span class="sourceLineNo">117</span><a id="line.117"> private static final byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];</a> |
| <span class="sourceLineNo">118</span><a id="line.118"></a> |
| <span class="sourceLineNo">119</span><a id="line.119"> // Populating the lookup and character arrays</a> |
| <span class="sourceLineNo">120</span><a id="line.120"></a> |
| <span class="sourceLineNo">121</span><a id="line.121"> static {</a> |
| <span class="sourceLineNo">122</span><a id="line.122"> for (int i = 0; i < BASELENGTH; i++) {</a> |
| <span class="sourceLineNo">123</span><a id="line.123"> base64Alphabet[i] = (byte) -1;</a> |
| <span class="sourceLineNo">124</span><a id="line.124"> }</a> |
| <span class="sourceLineNo">125</span><a id="line.125"> for (int i = 'Z'; i >= 'A'; i--) {</a> |
| <span class="sourceLineNo">126</span><a id="line.126"> base64Alphabet[i] = (byte) (i - 'A');</a> |
| <span class="sourceLineNo">127</span><a id="line.127"> }</a> |
| <span class="sourceLineNo">128</span><a id="line.128"> for (int i = 'z'; i >= 'a'; i--) {</a> |
| <span class="sourceLineNo">129</span><a id="line.129"> base64Alphabet[i] = (byte) (i - 'a' + 26);</a> |
| <span class="sourceLineNo">130</span><a id="line.130"> }</a> |
| <span class="sourceLineNo">131</span><a id="line.131"> for (int i = '9'; i >= '0'; i--) {</a> |
| <span class="sourceLineNo">132</span><a id="line.132"> base64Alphabet[i] = (byte) (i - '0' + 52);</a> |
| <span class="sourceLineNo">133</span><a id="line.133"> }</a> |
| <span class="sourceLineNo">134</span><a id="line.134"></a> |
| <span class="sourceLineNo">135</span><a id="line.135"> base64Alphabet['+'] = 62;</a> |
| <span class="sourceLineNo">136</span><a id="line.136"> base64Alphabet['/'] = 63;</a> |
| <span class="sourceLineNo">137</span><a id="line.137"></a> |
| <span class="sourceLineNo">138</span><a id="line.138"> for (int i = 0; i <= 25; i++) {</a> |
| <span class="sourceLineNo">139</span><a id="line.139"> lookUpBase64Alphabet[i] = (byte) ('A' + i);</a> |
| <span class="sourceLineNo">140</span><a id="line.140"> }</a> |
| <span class="sourceLineNo">141</span><a id="line.141"></a> |
| <span class="sourceLineNo">142</span><a id="line.142"> for (int i = 26, j = 0; i <= 51; i++, j++) {</a> |
| <span class="sourceLineNo">143</span><a id="line.143"> lookUpBase64Alphabet[i] = (byte) ('a' + j);</a> |
| <span class="sourceLineNo">144</span><a id="line.144"> }</a> |
| <span class="sourceLineNo">145</span><a id="line.145"></a> |
| <span class="sourceLineNo">146</span><a id="line.146"> for (int i = 52, j = 0; i <= 61; i++, j++) {</a> |
| <span class="sourceLineNo">147</span><a id="line.147"> lookUpBase64Alphabet[i] = (byte) ('0' + j);</a> |
| <span class="sourceLineNo">148</span><a id="line.148"> }</a> |
| <span class="sourceLineNo">149</span><a id="line.149"></a> |
| <span class="sourceLineNo">150</span><a id="line.150"> lookUpBase64Alphabet[62] = (byte) '+';</a> |
| <span class="sourceLineNo">151</span><a id="line.151"> lookUpBase64Alphabet[63] = (byte) '/';</a> |
| <span class="sourceLineNo">152</span><a id="line.152"> }</a> |
| <span class="sourceLineNo">153</span><a id="line.153"></a> |
| <span class="sourceLineNo">154</span><a id="line.154"> /**</a> |
| <span class="sourceLineNo">155</span><a id="line.155"> * Returns whether or not the <code>octet</code> is in the base 64 alphabet.</a> |
| <span class="sourceLineNo">156</span><a id="line.156"> *</a> |
| <span class="sourceLineNo">157</span><a id="line.157"> * @param octect The value to test</a> |
| <span class="sourceLineNo">158</span><a id="line.158"> * @return <code>true</code> if the value is defined in the the base 64 alphabet, <code>false</code> otherwise.</a> |
| <span class="sourceLineNo">159</span><a id="line.159"> */</a> |
| <span class="sourceLineNo">160</span><a id="line.160"> private static boolean isBase64(byte octect) {</a> |
| <span class="sourceLineNo">161</span><a id="line.161"> if (octect == PAD) {</a> |
| <span class="sourceLineNo">162</span><a id="line.162"> return true;</a> |
| <span class="sourceLineNo">163</span><a id="line.163"> } else //noinspection RedundantIfStatement</a> |
| <span class="sourceLineNo">164</span><a id="line.164"> if (octect < 0 || base64Alphabet[octect] == -1) {</a> |
| <span class="sourceLineNo">165</span><a id="line.165"> return false;</a> |
| <span class="sourceLineNo">166</span><a id="line.166"> } else {</a> |
| <span class="sourceLineNo">167</span><a id="line.167"> return true;</a> |
| <span class="sourceLineNo">168</span><a id="line.168"> }</a> |
| <span class="sourceLineNo">169</span><a id="line.169"> }</a> |
| <span class="sourceLineNo">170</span><a id="line.170"></a> |
| <span class="sourceLineNo">171</span><a id="line.171"> /**</a> |
| <span class="sourceLineNo">172</span><a id="line.172"> * Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.</a> |
| <span class="sourceLineNo">173</span><a id="line.173"> *</a> |
| <span class="sourceLineNo">174</span><a id="line.174"> * @param arrayOctect byte array to test</a> |
| <span class="sourceLineNo">175</span><a id="line.175"> * @return <code>true</code> if all bytes are valid characters in the Base64 alphabet or if the byte array is</a> |
| <span class="sourceLineNo">176</span><a id="line.176"> * empty; false, otherwise</a> |
| <span class="sourceLineNo">177</span><a id="line.177"> */</a> |
| <span class="sourceLineNo">178</span><a id="line.178"> public static boolean isBase64(byte[] arrayOctect) {</a> |
| <span class="sourceLineNo">179</span><a id="line.179"></a> |
| <span class="sourceLineNo">180</span><a id="line.180"> arrayOctect = discardWhitespace(arrayOctect);</a> |
| <span class="sourceLineNo">181</span><a id="line.181"></a> |
| <span class="sourceLineNo">182</span><a id="line.182"> int length = arrayOctect.length;</a> |
| <span class="sourceLineNo">183</span><a id="line.183"> if (length == 0) {</a> |
| <span class="sourceLineNo">184</span><a id="line.184"> // shouldn't a 0 length array be valid base64 data?</a> |
| <span class="sourceLineNo">185</span><a id="line.185"> // return false;</a> |
| <span class="sourceLineNo">186</span><a id="line.186"> return true;</a> |
| <span class="sourceLineNo">187</span><a id="line.187"> }</a> |
| <span class="sourceLineNo">188</span><a id="line.188"> for (int i = 0; i < length; i++) {</a> |
| <span class="sourceLineNo">189</span><a id="line.189"> if (!isBase64(arrayOctect[i])) {</a> |
| <span class="sourceLineNo">190</span><a id="line.190"> return false;</a> |
| <span class="sourceLineNo">191</span><a id="line.191"> }</a> |
| <span class="sourceLineNo">192</span><a id="line.192"> }</a> |
| <span class="sourceLineNo">193</span><a id="line.193"> return true;</a> |
| <span class="sourceLineNo">194</span><a id="line.194"> }</a> |
| <span class="sourceLineNo">195</span><a id="line.195"></a> |
| <span class="sourceLineNo">196</span><a id="line.196"> /**</a> |
| <span class="sourceLineNo">197</span><a id="line.197"> * Discards any whitespace from a base-64 encoded block.</a> |
| <span class="sourceLineNo">198</span><a id="line.198"> *</a> |
| <span class="sourceLineNo">199</span><a id="line.199"> * @param data The base-64 encoded data to discard the whitespace from.</a> |
| <span class="sourceLineNo">200</span><a id="line.200"> * @return The data, less whitespace (see RFC 2045).</a> |
| <span class="sourceLineNo">201</span><a id="line.201"> */</a> |
| <span class="sourceLineNo">202</span><a id="line.202"> static byte[] discardWhitespace(byte[] data) {</a> |
| <span class="sourceLineNo">203</span><a id="line.203"> byte groomedData[] = new byte[data.length];</a> |
| <span class="sourceLineNo">204</span><a id="line.204"> int bytesCopied = 0;</a> |
| <span class="sourceLineNo">205</span><a id="line.205"></a> |
| <span class="sourceLineNo">206</span><a id="line.206"> for (byte aByte : data) {</a> |
| <span class="sourceLineNo">207</span><a id="line.207"> switch (aByte) {</a> |
| <span class="sourceLineNo">208</span><a id="line.208"> case (byte) ' ':</a> |
| <span class="sourceLineNo">209</span><a id="line.209"> case (byte) '\n':</a> |
| <span class="sourceLineNo">210</span><a id="line.210"> case (byte) '\r':</a> |
| <span class="sourceLineNo">211</span><a id="line.211"> case (byte) '\t':</a> |
| <span class="sourceLineNo">212</span><a id="line.212"> break;</a> |
| <span class="sourceLineNo">213</span><a id="line.213"> default:</a> |
| <span class="sourceLineNo">214</span><a id="line.214"> groomedData[bytesCopied++] = aByte;</a> |
| <span class="sourceLineNo">215</span><a id="line.215"> }</a> |
| <span class="sourceLineNo">216</span><a id="line.216"> }</a> |
| <span class="sourceLineNo">217</span><a id="line.217"></a> |
| <span class="sourceLineNo">218</span><a id="line.218"> byte packedData[] = new byte[bytesCopied];</a> |
| <span class="sourceLineNo">219</span><a id="line.219"></a> |
| <span class="sourceLineNo">220</span><a id="line.220"> System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);</a> |
| <span class="sourceLineNo">221</span><a id="line.221"></a> |
| <span class="sourceLineNo">222</span><a id="line.222"> return packedData;</a> |
| <span class="sourceLineNo">223</span><a id="line.223"> }</a> |
| <span class="sourceLineNo">224</span><a id="line.224"></a> |
| <span class="sourceLineNo">225</span><a id="line.225"> /**</a> |
| <span class="sourceLineNo">226</span><a id="line.226"> * Base64 encodes the specified byte array and then encodes it as a String using Shiro's preferred character</a> |
| <span class="sourceLineNo">227</span><a id="line.227"> * encoding (UTF-8).</a> |
| <span class="sourceLineNo">228</span><a id="line.228"> *</a> |
| <span class="sourceLineNo">229</span><a id="line.229"> * @param bytes the byte array to Base64 encode.</a> |
| <span class="sourceLineNo">230</span><a id="line.230"> * @return a UTF-8 encoded String of the resulting Base64 encoded byte array.</a> |
| <span class="sourceLineNo">231</span><a id="line.231"> */</a> |
| <span class="sourceLineNo">232</span><a id="line.232"> public static String encodeToString(byte[] bytes) {</a> |
| <span class="sourceLineNo">233</span><a id="line.233"> byte[] encoded = encode(bytes);</a> |
| <span class="sourceLineNo">234</span><a id="line.234"> return CodecSupport.toString(encoded);</a> |
| <span class="sourceLineNo">235</span><a id="line.235"> }</a> |
| <span class="sourceLineNo">236</span><a id="line.236"></a> |
| <span class="sourceLineNo">237</span><a id="line.237"> /**</a> |
| <span class="sourceLineNo">238</span><a id="line.238"> * Encodes binary data using the base64 algorithm and chunks the encoded output into 76 character blocks</a> |
| <span class="sourceLineNo">239</span><a id="line.239"> *</a> |
| <span class="sourceLineNo">240</span><a id="line.240"> * @param binaryData binary data to encodeToChars</a> |
| <span class="sourceLineNo">241</span><a id="line.241"> * @return Base64 characters chunked in 76 character blocks</a> |
| <span class="sourceLineNo">242</span><a id="line.242"> */</a> |
| <span class="sourceLineNo">243</span><a id="line.243"> public static byte[] encodeChunked(byte[] binaryData) {</a> |
| <span class="sourceLineNo">244</span><a id="line.244"> return encode(binaryData, true);</a> |
| <span class="sourceLineNo">245</span><a id="line.245"> }</a> |
| <span class="sourceLineNo">246</span><a id="line.246"></a> |
| <span class="sourceLineNo">247</span><a id="line.247"> /**</a> |
| <span class="sourceLineNo">248</span><a id="line.248"> * Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64 alphabet.</a> |
| <span class="sourceLineNo">249</span><a id="line.249"> *</a> |
| <span class="sourceLineNo">250</span><a id="line.250"> * @param pArray a byte array containing binary data</a> |
| <span class="sourceLineNo">251</span><a id="line.251"> * @return A byte array containing only Base64 character data</a> |
| <span class="sourceLineNo">252</span><a id="line.252"> */</a> |
| <span class="sourceLineNo">253</span><a id="line.253"> public static byte[] encode(byte[] pArray) {</a> |
| <span class="sourceLineNo">254</span><a id="line.254"> return encode(pArray, false);</a> |
| <span class="sourceLineNo">255</span><a id="line.255"> }</a> |
| <span class="sourceLineNo">256</span><a id="line.256"></a> |
| <span class="sourceLineNo">257</span><a id="line.257"> /**</a> |
| <span class="sourceLineNo">258</span><a id="line.258"> * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.</a> |
| <span class="sourceLineNo">259</span><a id="line.259"> *</a> |
| <span class="sourceLineNo">260</span><a id="line.260"> * @param binaryData Array containing binary data to encodeToChars.</a> |
| <span class="sourceLineNo">261</span><a id="line.261"> * @param isChunked if <code>true</code> this encoder will chunk the base64 output into 76 character blocks</a> |
| <span class="sourceLineNo">262</span><a id="line.262"> * @return Base64-encoded data.</a> |
| <span class="sourceLineNo">263</span><a id="line.263"> * @throws IllegalArgumentException Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}</a> |
| <span class="sourceLineNo">264</span><a id="line.264"> */</a> |
| <span class="sourceLineNo">265</span><a id="line.265"> public static byte[] encode(byte[] binaryData, boolean isChunked) {</a> |
| <span class="sourceLineNo">266</span><a id="line.266"> long binaryDataLength = binaryData.length;</a> |
| <span class="sourceLineNo">267</span><a id="line.267"> long lengthDataBits = binaryDataLength * EIGHTBIT;</a> |
| <span class="sourceLineNo">268</span><a id="line.268"> long fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;</a> |
| <span class="sourceLineNo">269</span><a id="line.269"> long tripletCount = lengthDataBits / TWENTYFOURBITGROUP;</a> |
| <span class="sourceLineNo">270</span><a id="line.270"> long encodedDataLengthLong;</a> |
| <span class="sourceLineNo">271</span><a id="line.271"> int chunckCount = 0;</a> |
| <span class="sourceLineNo">272</span><a id="line.272"></a> |
| <span class="sourceLineNo">273</span><a id="line.273"> if (fewerThan24bits != 0) {</a> |
| <span class="sourceLineNo">274</span><a id="line.274"> // data not divisible by 24 bit</a> |
| <span class="sourceLineNo">275</span><a id="line.275"> encodedDataLengthLong = (tripletCount + 1) * 4;</a> |
| <span class="sourceLineNo">276</span><a id="line.276"> } else {</a> |
| <span class="sourceLineNo">277</span><a id="line.277"> // 16 or 8 bit</a> |
| <span class="sourceLineNo">278</span><a id="line.278"> encodedDataLengthLong = tripletCount * 4;</a> |
| <span class="sourceLineNo">279</span><a id="line.279"> }</a> |
| <span class="sourceLineNo">280</span><a id="line.280"></a> |
| <span class="sourceLineNo">281</span><a id="line.281"> // If the output is to be "chunked" into 76 character sections,</a> |
| <span class="sourceLineNo">282</span><a id="line.282"> // for compliance with RFC 2045 MIME, then it is important to</a> |
| <span class="sourceLineNo">283</span><a id="line.283"> // allow for extra length to account for the separator(s)</a> |
| <span class="sourceLineNo">284</span><a id="line.284"> if (isChunked) {</a> |
| <span class="sourceLineNo">285</span><a id="line.285"></a> |
| <span class="sourceLineNo">286</span><a id="line.286"> chunckCount = (CHUNK_SEPARATOR.length == 0 ? 0 : (int) Math</a> |
| <span class="sourceLineNo">287</span><a id="line.287"> .ceil((float) encodedDataLengthLong / CHUNK_SIZE));</a> |
| <span class="sourceLineNo">288</span><a id="line.288"> encodedDataLengthLong += chunckCount * CHUNK_SEPARATOR.length;</a> |
| <span class="sourceLineNo">289</span><a id="line.289"> }</a> |
| <span class="sourceLineNo">290</span><a id="line.290"></a> |
| <span class="sourceLineNo">291</span><a id="line.291"> if (encodedDataLengthLong > Integer.MAX_VALUE) {</a> |
| <span class="sourceLineNo">292</span><a id="line.292"> throw new IllegalArgumentException(</a> |
| <span class="sourceLineNo">293</span><a id="line.293"> "Input array too big, output array would be bigger than Integer.MAX_VALUE=" + Integer.MAX_VALUE);</a> |
| <span class="sourceLineNo">294</span><a id="line.294"> }</a> |
| <span class="sourceLineNo">295</span><a id="line.295"> int encodedDataLength = (int) encodedDataLengthLong;</a> |
| <span class="sourceLineNo">296</span><a id="line.296"> byte encodedData[] = new byte[encodedDataLength];</a> |
| <span class="sourceLineNo">297</span><a id="line.297"></a> |
| <span class="sourceLineNo">298</span><a id="line.298"> byte k, l, b1, b2, b3;</a> |
| <span class="sourceLineNo">299</span><a id="line.299"></a> |
| <span class="sourceLineNo">300</span><a id="line.300"> int encodedIndex = 0;</a> |
| <span class="sourceLineNo">301</span><a id="line.301"> int dataIndex;</a> |
| <span class="sourceLineNo">302</span><a id="line.302"> int i;</a> |
| <span class="sourceLineNo">303</span><a id="line.303"> int nextSeparatorIndex = CHUNK_SIZE;</a> |
| <span class="sourceLineNo">304</span><a id="line.304"> int chunksSoFar = 0;</a> |
| <span class="sourceLineNo">305</span><a id="line.305"></a> |
| <span class="sourceLineNo">306</span><a id="line.306"> // log.debug("number of triplets = " + numberTriplets);</a> |
| <span class="sourceLineNo">307</span><a id="line.307"> for (i = 0; i < tripletCount; i++) {</a> |
| <span class="sourceLineNo">308</span><a id="line.308"> dataIndex = i * 3;</a> |
| <span class="sourceLineNo">309</span><a id="line.309"> b1 = binaryData[dataIndex];</a> |
| <span class="sourceLineNo">310</span><a id="line.310"> b2 = binaryData[dataIndex + 1];</a> |
| <span class="sourceLineNo">311</span><a id="line.311"> b3 = binaryData[dataIndex + 2];</a> |
| <span class="sourceLineNo">312</span><a id="line.312"></a> |
| <span class="sourceLineNo">313</span><a id="line.313"> // log.debug("b1= " + b1 +", b2= " + b2 + ", b3= " + b3);</a> |
| <span class="sourceLineNo">314</span><a id="line.314"></a> |
| <span class="sourceLineNo">315</span><a id="line.315"> l = (byte) (b2 & 0x0f);</a> |
| <span class="sourceLineNo">316</span><a id="line.316"> k = (byte) (b1 & 0x03);</a> |
| <span class="sourceLineNo">317</span><a id="line.317"></a> |
| <span class="sourceLineNo">318</span><a id="line.318"> byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);</a> |
| <span class="sourceLineNo">319</span><a id="line.319"> byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);</a> |
| <span class="sourceLineNo">320</span><a id="line.320"> byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);</a> |
| <span class="sourceLineNo">321</span><a id="line.321"></a> |
| <span class="sourceLineNo">322</span><a id="line.322"> encodedData[encodedIndex] = lookUpBase64Alphabet[val1];</a> |
| <span class="sourceLineNo">323</span><a id="line.323"> // log.debug( "val2 = " + val2 );</a> |
| <span class="sourceLineNo">324</span><a id="line.324"> // log.debug( "k4 = " + (k<<4) );</a> |
| <span class="sourceLineNo">325</span><a id="line.325"> // log.debug( "vak = " + (val2 | (k<<4)) );</a> |
| <span class="sourceLineNo">326</span><a id="line.326"> encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k << 4)];</a> |
| <span class="sourceLineNo">327</span><a id="line.327"> encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l << 2) | val3];</a> |
| <span class="sourceLineNo">328</span><a id="line.328"> encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];</a> |
| <span class="sourceLineNo">329</span><a id="line.329"></a> |
| <span class="sourceLineNo">330</span><a id="line.330"> encodedIndex += 4;</a> |
| <span class="sourceLineNo">331</span><a id="line.331"></a> |
| <span class="sourceLineNo">332</span><a id="line.332"> // If we are chunking, let's put a chunk separator down.</a> |
| <span class="sourceLineNo">333</span><a id="line.333"> if (isChunked) {</a> |
| <span class="sourceLineNo">334</span><a id="line.334"> // this assumes that CHUNK_SIZE % 4 == 0</a> |
| <span class="sourceLineNo">335</span><a id="line.335"> if (encodedIndex == nextSeparatorIndex) {</a> |
| <span class="sourceLineNo">336</span><a id="line.336"> System.arraycopy(CHUNK_SEPARATOR, 0, encodedData, encodedIndex, CHUNK_SEPARATOR.length);</a> |
| <span class="sourceLineNo">337</span><a id="line.337"> chunksSoFar++;</a> |
| <span class="sourceLineNo">338</span><a id="line.338"> nextSeparatorIndex = (CHUNK_SIZE * (chunksSoFar + 1)) + (chunksSoFar * CHUNK_SEPARATOR.length);</a> |
| <span class="sourceLineNo">339</span><a id="line.339"> encodedIndex += CHUNK_SEPARATOR.length;</a> |
| <span class="sourceLineNo">340</span><a id="line.340"> }</a> |
| <span class="sourceLineNo">341</span><a id="line.341"> }</a> |
| <span class="sourceLineNo">342</span><a id="line.342"> }</a> |
| <span class="sourceLineNo">343</span><a id="line.343"></a> |
| <span class="sourceLineNo">344</span><a id="line.344"> // form integral number of 6-bit groups</a> |
| <span class="sourceLineNo">345</span><a id="line.345"> dataIndex = i * 3;</a> |
| <span class="sourceLineNo">346</span><a id="line.346"></a> |
| <span class="sourceLineNo">347</span><a id="line.347"> if (fewerThan24bits == EIGHTBIT) {</a> |
| <span class="sourceLineNo">348</span><a id="line.348"> b1 = binaryData[dataIndex];</a> |
| <span class="sourceLineNo">349</span><a id="line.349"> k = (byte) (b1 & 0x03);</a> |
| <span class="sourceLineNo">350</span><a id="line.350"> // log.debug("b1=" + b1);</a> |
| <span class="sourceLineNo">351</span><a id="line.351"> // log.debug("b1<<2 = " + (b1>>2) );</a> |
| <span class="sourceLineNo">352</span><a id="line.352"> byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);</a> |
| <span class="sourceLineNo">353</span><a id="line.353"> encodedData[encodedIndex] = lookUpBase64Alphabet[val1];</a> |
| <span class="sourceLineNo">354</span><a id="line.354"> encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];</a> |
| <span class="sourceLineNo">355</span><a id="line.355"> encodedData[encodedIndex + 2] = PAD;</a> |
| <span class="sourceLineNo">356</span><a id="line.356"> encodedData[encodedIndex + 3] = PAD;</a> |
| <span class="sourceLineNo">357</span><a id="line.357"> } else if (fewerThan24bits == SIXTEENBIT) {</a> |
| <span class="sourceLineNo">358</span><a id="line.358"></a> |
| <span class="sourceLineNo">359</span><a id="line.359"> b1 = binaryData[dataIndex];</a> |
| <span class="sourceLineNo">360</span><a id="line.360"> b2 = binaryData[dataIndex + 1];</a> |
| <span class="sourceLineNo">361</span><a id="line.361"> l = (byte) (b2 & 0x0f);</a> |
| <span class="sourceLineNo">362</span><a id="line.362"> k = (byte) (b1 & 0x03);</a> |
| <span class="sourceLineNo">363</span><a id="line.363"></a> |
| <span class="sourceLineNo">364</span><a id="line.364"> byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);</a> |
| <span class="sourceLineNo">365</span><a id="line.365"> byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);</a> |
| <span class="sourceLineNo">366</span><a id="line.366"></a> |
| <span class="sourceLineNo">367</span><a id="line.367"> encodedData[encodedIndex] = lookUpBase64Alphabet[val1];</a> |
| <span class="sourceLineNo">368</span><a id="line.368"> encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k << 4)];</a> |
| <span class="sourceLineNo">369</span><a id="line.369"> encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];</a> |
| <span class="sourceLineNo">370</span><a id="line.370"> encodedData[encodedIndex + 3] = PAD;</a> |
| <span class="sourceLineNo">371</span><a id="line.371"> }</a> |
| <span class="sourceLineNo">372</span><a id="line.372"></a> |
| <span class="sourceLineNo">373</span><a id="line.373"> if (isChunked) {</a> |
| <span class="sourceLineNo">374</span><a id="line.374"> // we also add a separator to the end of the final chunk.</a> |
| <span class="sourceLineNo">375</span><a id="line.375"> if (chunksSoFar < chunckCount) {</a> |
| <span class="sourceLineNo">376</span><a id="line.376"> System.arraycopy(CHUNK_SEPARATOR, 0, encodedData, encodedDataLength - CHUNK_SEPARATOR.length,</a> |
| <span class="sourceLineNo">377</span><a id="line.377"> CHUNK_SEPARATOR.length);</a> |
| <span class="sourceLineNo">378</span><a id="line.378"> }</a> |
| <span class="sourceLineNo">379</span><a id="line.379"> }</a> |
| <span class="sourceLineNo">380</span><a id="line.380"></a> |
| <span class="sourceLineNo">381</span><a id="line.381"> return encodedData;</a> |
| <span class="sourceLineNo">382</span><a id="line.382"> }</a> |
| <span class="sourceLineNo">383</span><a id="line.383"></a> |
| <span class="sourceLineNo">384</span><a id="line.384"> /**</a> |
| <span class="sourceLineNo">385</span><a id="line.385"> * Converts the specified UTF-8 Base64 encoded String and decodes it to a resultant UTF-8 encoded string.</a> |
| <span class="sourceLineNo">386</span><a id="line.386"> *</a> |
| <span class="sourceLineNo">387</span><a id="line.387"> * @param base64Encoded a UTF-8 Base64 encoded String</a> |
| <span class="sourceLineNo">388</span><a id="line.388"> * @return the decoded String, UTF-8 encoded.</a> |
| <span class="sourceLineNo">389</span><a id="line.389"> */</a> |
| <span class="sourceLineNo">390</span><a id="line.390"> public static String decodeToString(String base64Encoded) {</a> |
| <span class="sourceLineNo">391</span><a id="line.391"> byte[] encodedBytes = CodecSupport.toBytes(base64Encoded);</a> |
| <span class="sourceLineNo">392</span><a id="line.392"> return decodeToString(encodedBytes);</a> |
| <span class="sourceLineNo">393</span><a id="line.393"> }</a> |
| <span class="sourceLineNo">394</span><a id="line.394"></a> |
| <span class="sourceLineNo">395</span><a id="line.395"> /**</a> |
| <span class="sourceLineNo">396</span><a id="line.396"> * Decodes the specified Base64 encoded byte array and returns the decoded result as a UTF-8 encoded.</a> |
| <span class="sourceLineNo">397</span><a id="line.397"> *</a> |
| <span class="sourceLineNo">398</span><a id="line.398"> * @param base64Encoded a Base64 encoded byte array</a> |
| <span class="sourceLineNo">399</span><a id="line.399"> * @return the decoded String, UTF-8 encoded.</a> |
| <span class="sourceLineNo">400</span><a id="line.400"> */</a> |
| <span class="sourceLineNo">401</span><a id="line.401"> public static String decodeToString(byte[] base64Encoded) {</a> |
| <span class="sourceLineNo">402</span><a id="line.402"> byte[] decoded = decode(base64Encoded);</a> |
| <span class="sourceLineNo">403</span><a id="line.403"> return CodecSupport.toString(decoded);</a> |
| <span class="sourceLineNo">404</span><a id="line.404"> }</a> |
| <span class="sourceLineNo">405</span><a id="line.405"></a> |
| <span class="sourceLineNo">406</span><a id="line.406"> /**</a> |
| <span class="sourceLineNo">407</span><a id="line.407"> * Converts the specified UTF-8 Base64 encoded String and decodes it to a raw Base64 decoded byte array.</a> |
| <span class="sourceLineNo">408</span><a id="line.408"> *</a> |
| <span class="sourceLineNo">409</span><a id="line.409"> * @param base64Encoded a UTF-8 Base64 encoded String</a> |
| <span class="sourceLineNo">410</span><a id="line.410"> * @return the raw Base64 decoded byte array.</a> |
| <span class="sourceLineNo">411</span><a id="line.411"> */</a> |
| <span class="sourceLineNo">412</span><a id="line.412"> public static byte[] decode(String base64Encoded) {</a> |
| <span class="sourceLineNo">413</span><a id="line.413"> byte[] bytes = CodecSupport.toBytes(base64Encoded);</a> |
| <span class="sourceLineNo">414</span><a id="line.414"> return decode(bytes);</a> |
| <span class="sourceLineNo">415</span><a id="line.415"> }</a> |
| <span class="sourceLineNo">416</span><a id="line.416"></a> |
| <span class="sourceLineNo">417</span><a id="line.417"> /**</a> |
| <span class="sourceLineNo">418</span><a id="line.418"> * Decodes Base64 data into octets</a> |
| <span class="sourceLineNo">419</span><a id="line.419"> *</a> |
| <span class="sourceLineNo">420</span><a id="line.420"> * @param base64Data Byte array containing Base64 data</a> |
| <span class="sourceLineNo">421</span><a id="line.421"> * @return Array containing decoded data.</a> |
| <span class="sourceLineNo">422</span><a id="line.422"> */</a> |
| <span class="sourceLineNo">423</span><a id="line.423"> public static byte[] decode(byte[] base64Data) {</a> |
| <span class="sourceLineNo">424</span><a id="line.424"> // RFC 2045 requires that we discard ALL non-Base64 characters</a> |
| <span class="sourceLineNo">425</span><a id="line.425"> base64Data = discardNonBase64(base64Data);</a> |
| <span class="sourceLineNo">426</span><a id="line.426"></a> |
| <span class="sourceLineNo">427</span><a id="line.427"> // handle the edge case, so we don't have to worry about it later</a> |
| <span class="sourceLineNo">428</span><a id="line.428"> if (base64Data.length == 0) {</a> |
| <span class="sourceLineNo">429</span><a id="line.429"> return new byte[0];</a> |
| <span class="sourceLineNo">430</span><a id="line.430"> }</a> |
| <span class="sourceLineNo">431</span><a id="line.431"></a> |
| <span class="sourceLineNo">432</span><a id="line.432"> int numberQuadruple = base64Data.length / FOURBYTE;</a> |
| <span class="sourceLineNo">433</span><a id="line.433"> byte decodedData[];</a> |
| <span class="sourceLineNo">434</span><a id="line.434"> byte b1, b2, b3, b4, marker0, marker1;</a> |
| <span class="sourceLineNo">435</span><a id="line.435"></a> |
| <span class="sourceLineNo">436</span><a id="line.436"> // Throw away anything not in base64Data</a> |
| <span class="sourceLineNo">437</span><a id="line.437"></a> |
| <span class="sourceLineNo">438</span><a id="line.438"> int encodedIndex = 0;</a> |
| <span class="sourceLineNo">439</span><a id="line.439"> int dataIndex;</a> |
| <span class="sourceLineNo">440</span><a id="line.440"> {</a> |
| <span class="sourceLineNo">441</span><a id="line.441"> // this sizes the output array properly - rlw</a> |
| <span class="sourceLineNo">442</span><a id="line.442"> int lastData = base64Data.length;</a> |
| <span class="sourceLineNo">443</span><a id="line.443"> // ignore the '=' padding</a> |
| <span class="sourceLineNo">444</span><a id="line.444"> while (base64Data[lastData - 1] == PAD) {</a> |
| <span class="sourceLineNo">445</span><a id="line.445"> if (--lastData == 0) {</a> |
| <span class="sourceLineNo">446</span><a id="line.446"> return new byte[0];</a> |
| <span class="sourceLineNo">447</span><a id="line.447"> }</a> |
| <span class="sourceLineNo">448</span><a id="line.448"> }</a> |
| <span class="sourceLineNo">449</span><a id="line.449"> decodedData = new byte[lastData - numberQuadruple];</a> |
| <span class="sourceLineNo">450</span><a id="line.450"> }</a> |
| <span class="sourceLineNo">451</span><a id="line.451"></a> |
| <span class="sourceLineNo">452</span><a id="line.452"> for (int i = 0; i < numberQuadruple; i++) {</a> |
| <span class="sourceLineNo">453</span><a id="line.453"> dataIndex = i * 4;</a> |
| <span class="sourceLineNo">454</span><a id="line.454"> marker0 = base64Data[dataIndex + 2];</a> |
| <span class="sourceLineNo">455</span><a id="line.455"> marker1 = base64Data[dataIndex + 3];</a> |
| <span class="sourceLineNo">456</span><a id="line.456"></a> |
| <span class="sourceLineNo">457</span><a id="line.457"> b1 = base64Alphabet[base64Data[dataIndex]];</a> |
| <span class="sourceLineNo">458</span><a id="line.458"> b2 = base64Alphabet[base64Data[dataIndex + 1]];</a> |
| <span class="sourceLineNo">459</span><a id="line.459"></a> |
| <span class="sourceLineNo">460</span><a id="line.460"> if (marker0 != PAD && marker1 != PAD) {</a> |
| <span class="sourceLineNo">461</span><a id="line.461"> // No PAD e.g 3cQl</a> |
| <span class="sourceLineNo">462</span><a id="line.462"> b3 = base64Alphabet[marker0];</a> |
| <span class="sourceLineNo">463</span><a id="line.463"> b4 = base64Alphabet[marker1];</a> |
| <span class="sourceLineNo">464</span><a id="line.464"></a> |
| <span class="sourceLineNo">465</span><a id="line.465"> decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);</a> |
| <span class="sourceLineNo">466</span><a id="line.466"> decodedData[encodedIndex + 1] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));</a> |
| <span class="sourceLineNo">467</span><a id="line.467"> decodedData[encodedIndex + 2] = (byte) (b3 << 6 | b4);</a> |
| <span class="sourceLineNo">468</span><a id="line.468"> } else if (marker0 == PAD) {</a> |
| <span class="sourceLineNo">469</span><a id="line.469"> // Two PAD e.g. 3c[Pad][Pad]</a> |
| <span class="sourceLineNo">470</span><a id="line.470"> decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);</a> |
| <span class="sourceLineNo">471</span><a id="line.471"> } else {</a> |
| <span class="sourceLineNo">472</span><a id="line.472"> // One PAD e.g. 3cQ[Pad]</a> |
| <span class="sourceLineNo">473</span><a id="line.473"> b3 = base64Alphabet[marker0];</a> |
| <span class="sourceLineNo">474</span><a id="line.474"> decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);</a> |
| <span class="sourceLineNo">475</span><a id="line.475"> decodedData[encodedIndex + 1] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));</a> |
| <span class="sourceLineNo">476</span><a id="line.476"> }</a> |
| <span class="sourceLineNo">477</span><a id="line.477"> encodedIndex += 3;</a> |
| <span class="sourceLineNo">478</span><a id="line.478"> }</a> |
| <span class="sourceLineNo">479</span><a id="line.479"> return decodedData;</a> |
| <span class="sourceLineNo">480</span><a id="line.480"> }</a> |
| <span class="sourceLineNo">481</span><a id="line.481"></a> |
| <span class="sourceLineNo">482</span><a id="line.482"> /**</a> |
| <span class="sourceLineNo">483</span><a id="line.483"> * Discards any characters outside of the base64 alphabet, per the requirements on page 25 of RFC 2045 - "Any</a> |
| <span class="sourceLineNo">484</span><a id="line.484"> * characters outside of the base64 alphabet are to be ignored in base64 encoded data."</a> |
| <span class="sourceLineNo">485</span><a id="line.485"> *</a> |
| <span class="sourceLineNo">486</span><a id="line.486"> * @param data The base-64 encoded data to groom</a> |
| <span class="sourceLineNo">487</span><a id="line.487"> * @return The data, less non-base64 characters (see RFC 2045).</a> |
| <span class="sourceLineNo">488</span><a id="line.488"> */</a> |
| <span class="sourceLineNo">489</span><a id="line.489"> static byte[] discardNonBase64(byte[] data) {</a> |
| <span class="sourceLineNo">490</span><a id="line.490"> byte groomedData[] = new byte[data.length];</a> |
| <span class="sourceLineNo">491</span><a id="line.491"> int bytesCopied = 0;</a> |
| <span class="sourceLineNo">492</span><a id="line.492"></a> |
| <span class="sourceLineNo">493</span><a id="line.493"> for (byte aByte : data) {</a> |
| <span class="sourceLineNo">494</span><a id="line.494"> if (isBase64(aByte)) {</a> |
| <span class="sourceLineNo">495</span><a id="line.495"> groomedData[bytesCopied++] = aByte;</a> |
| <span class="sourceLineNo">496</span><a id="line.496"> }</a> |
| <span class="sourceLineNo">497</span><a id="line.497"> }</a> |
| <span class="sourceLineNo">498</span><a id="line.498"></a> |
| <span class="sourceLineNo">499</span><a id="line.499"> byte packedData[] = new byte[bytesCopied];</a> |
| <span class="sourceLineNo">500</span><a id="line.500"></a> |
| <span class="sourceLineNo">501</span><a id="line.501"> System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);</a> |
| <span class="sourceLineNo">502</span><a id="line.502"></a> |
| <span class="sourceLineNo">503</span><a id="line.503"> return packedData;</a> |
| <span class="sourceLineNo">504</span><a id="line.504"> }</a> |
| <span class="sourceLineNo">505</span><a id="line.505"></a> |
| <span class="sourceLineNo">506</span><a id="line.506">}</a> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
