| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html lang="en"> |
| <head> |
| <title>Source code</title> |
| <link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style"> |
| </head> |
| <body> |
| <div class="sourceContainer"> |
| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing,<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * software distributed under the License is distributed on an<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * KIND, either express or implied. See the License for the<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * specific language governing permissions and limitations<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> */<a name="line.18"></a> |
| <span class="sourceLineNo">019</span>package org.apache.shiro.codec;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>/**<a name="line.21"></a> |
| <span class="sourceLineNo">022</span> * Provides <a href="http://en.wikipedia.org/wiki/Base64">Base 64</a> encoding and decoding as defined by<a name="line.22"></a> |
| <span class="sourceLineNo">023</span> * <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>.<a name="line.23"></a> |
| <span class="sourceLineNo">024</span> * <p/><a name="line.24"></a> |
| <span class="sourceLineNo">025</span> * This class implements section <cite>6.8. Base64 Content-Transfer-Encoding</cite> from RFC 2045 <cite>Multipurpose<a name="line.25"></a> |
| <span class="sourceLineNo">026</span> * Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies</cite> by Freed and Borenstein.<a name="line.26"></a> |
| <span class="sourceLineNo">027</span> * <p/><a name="line.27"></a> |
| <span class="sourceLineNo">028</span> * This class was borrowed from Apache Commons Codec SVN repository (rev. 618419) with modifications<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * to enable Base64 conversion without a full dependecny on Commons Codec. We didn't want to reinvent the wheel of<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * great work they've done, but also didn't want to force every Shiro user to depend on the commons-codec.jar<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * <p/><a name="line.31"></a> |
| <span class="sourceLineNo">032</span> * As per the Apache 2.0 license, the original copyright notice and all author and copyright information have<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * remained in tact.<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> *<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * @see <a href="http://en.wikipedia.org/wiki/Base64">Wikipedia: Base 64</a><a name="line.35"></a> |
| <span class="sourceLineNo">036</span> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a><a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * @since 0.9<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> */<a name="line.38"></a> |
| <span class="sourceLineNo">039</span>public class Base64 {<a name="line.39"></a> |
| <span class="sourceLineNo">040</span><a name="line.40"></a> |
| <span class="sourceLineNo">041</span> /**<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * Chunk size per RFC 2045 section 6.8.<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * <p/><a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * The character limit does not count the trailing CRLF, but counts all other characters, including any<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * equal signs.<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> *<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 6.8</a><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> */<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> static final int CHUNK_SIZE = 76;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> /**<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * Chunk separator per RFC 2045 section 2.1.<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> *<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a><a name="line.54"></a> |
| <span class="sourceLineNo">055</span> */<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> static final byte[] CHUNK_SEPARATOR = "\r\n".getBytes();<a name="line.56"></a> |
| <span class="sourceLineNo">057</span><a name="line.57"></a> |
| <span class="sourceLineNo">058</span> /**<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * The base length.<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> */<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> private static final int BASELENGTH = 255;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span><a name="line.62"></a> |
| <span class="sourceLineNo">063</span> /**<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> * Lookup length.<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> */<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> private static final int LOOKUPLENGTH = 64;<a name="line.66"></a> |
| <span class="sourceLineNo">067</span><a name="line.67"></a> |
| <span class="sourceLineNo">068</span> /**<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> * Used to calculate the number of bits in a byte.<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> */<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> private static final int EIGHTBIT = 8;<a name="line.71"></a> |
| <span class="sourceLineNo">072</span><a name="line.72"></a> |
| <span class="sourceLineNo">073</span> /**<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> * Used when encoding something which has fewer than 24 bits.<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> */<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> private static final int SIXTEENBIT = 16;<a name="line.76"></a> |
| <span class="sourceLineNo">077</span><a name="line.77"></a> |
| <span class="sourceLineNo">078</span> /**<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> * Used to determine how many bits data contains.<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> */<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> private static final int TWENTYFOURBITGROUP = 24;<a name="line.81"></a> |
| <span class="sourceLineNo">082</span><a name="line.82"></a> |
| <span class="sourceLineNo">083</span> /**<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> * Used to get the number of Quadruples.<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> */<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> private static final int FOURBYTE = 4;<a name="line.86"></a> |
| <span class="sourceLineNo">087</span><a name="line.87"></a> |
| <span class="sourceLineNo">088</span> /**<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> * Used to test the sign of a byte.<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> */<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> private static final int SIGN = -128;<a name="line.91"></a> |
| <span class="sourceLineNo">092</span><a name="line.92"></a> |
| <span class="sourceLineNo">093</span> /**<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> * Byte used to pad output.<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> */<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> private static final byte PAD = (byte) '=';<a name="line.96"></a> |
| <span class="sourceLineNo">097</span><a name="line.97"></a> |
| <span class="sourceLineNo">098</span> /**<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> * Contains the Base64 values <code>0</code> through <code>63</code> accessed by using character encodings as<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> * indices.<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> * <p/><a name="line.101"></a> |
| <span class="sourceLineNo">102</span> * <p>For example, <code>base64Alphabet['+']</code> returns <code>62</code>.</p><a name="line.102"></a> |
| <span class="sourceLineNo">103</span> * <p/><a name="line.103"></a> |
| <span class="sourceLineNo">104</span> * <p>The value of undefined encodings is <code>-1</code>.</p><a name="line.104"></a> |
| <span class="sourceLineNo">105</span> */<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> private static final byte[] base64Alphabet = new byte[BASELENGTH];<a name="line.106"></a> |
| <span class="sourceLineNo">107</span><a name="line.107"></a> |
| <span class="sourceLineNo">108</span> /**<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> * <p>Contains the Base64 encodings <code>A</code> through <code>Z</code>, followed by <code>a</code> through<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> * <code>z</code>, followed by <code>0</code> through <code>9</code>, followed by <code>+</code>, and<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> * <code>/</code>.</p><a name="line.111"></a> |
| <span class="sourceLineNo">112</span> * <p/><a name="line.112"></a> |
| <span class="sourceLineNo">113</span> * <p>This array is accessed by using character values as indices.</p><a name="line.113"></a> |
| <span class="sourceLineNo">114</span> * <p/><a name="line.114"></a> |
| <span class="sourceLineNo">115</span> * <p>For example, <code>lookUpBase64Alphabet[62] </code> returns <code>'+'</code>.</p><a name="line.115"></a> |
| <span class="sourceLineNo">116</span> */<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> private static final byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];<a name="line.117"></a> |
| <span class="sourceLineNo">118</span><a name="line.118"></a> |
| <span class="sourceLineNo">119</span> // Populating the lookup and character arrays<a name="line.119"></a> |
| <span class="sourceLineNo">120</span><a name="line.120"></a> |
| <span class="sourceLineNo">121</span> static {<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> for (int i = 0; i < BASELENGTH; i++) {<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> base64Alphabet[i] = (byte) -1;<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> }<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> for (int i = 'Z'; i >= 'A'; i--) {<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> base64Alphabet[i] = (byte) (i - 'A');<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> }<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> for (int i = 'z'; i >= 'a'; i--) {<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> base64Alphabet[i] = (byte) (i - 'a' + 26);<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> }<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> for (int i = '9'; i >= '0'; i--) {<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> base64Alphabet[i] = (byte) (i - '0' + 52);<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> }<a name="line.133"></a> |
| <span class="sourceLineNo">134</span><a name="line.134"></a> |
| <span class="sourceLineNo">135</span> base64Alphabet['+'] = 62;<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> base64Alphabet['/'] = 63;<a name="line.136"></a> |
| <span class="sourceLineNo">137</span><a name="line.137"></a> |
| <span class="sourceLineNo">138</span> for (int i = 0; i <= 25; i++) {<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> lookUpBase64Alphabet[i] = (byte) ('A' + i);<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> }<a name="line.140"></a> |
| <span class="sourceLineNo">141</span><a name="line.141"></a> |
| <span class="sourceLineNo">142</span> for (int i = 26, j = 0; i <= 51; i++, j++) {<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> lookUpBase64Alphabet[i] = (byte) ('a' + j);<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> }<a name="line.144"></a> |
| <span class="sourceLineNo">145</span><a name="line.145"></a> |
| <span class="sourceLineNo">146</span> for (int i = 52, j = 0; i <= 61; i++, j++) {<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> lookUpBase64Alphabet[i] = (byte) ('0' + j);<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> }<a name="line.148"></a> |
| <span class="sourceLineNo">149</span><a name="line.149"></a> |
| <span class="sourceLineNo">150</span> lookUpBase64Alphabet[62] = (byte) '+';<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> lookUpBase64Alphabet[63] = (byte) '/';<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> }<a name="line.152"></a> |
| <span class="sourceLineNo">153</span><a name="line.153"></a> |
| <span class="sourceLineNo">154</span> /**<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> * Returns whether or not the <code>octect</code> is in the base 64 alphabet.<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> *<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> * @param octect The value to test<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> * @return <code>true</code> if the value is defined in the the base 64 alphabet, <code>false</code> otherwise.<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> */<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> private static boolean isBase64(byte octect) {<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> if (octect == PAD) {<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> return true;<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> } else //noinspection RedundantIfStatement<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> if (octect < 0 || base64Alphabet[octect] == -1) {<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> return false;<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> } else {<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> return true;<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> }<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> }<a name="line.169"></a> |
| <span class="sourceLineNo">170</span><a name="line.170"></a> |
| <span class="sourceLineNo">171</span> /**<a name="line.171"></a> |
| <span class="sourceLineNo">172</span> * Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.<a name="line.172"></a> |
| <span class="sourceLineNo">173</span> *<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> * @param arrayOctect byte array to test<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> * @return <code>true</code> if all bytes are valid characters in the Base64 alphabet or if the byte array is<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> * empty; false, otherwise<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> */<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> public static boolean isBase64(byte[] arrayOctect) {<a name="line.178"></a> |
| <span class="sourceLineNo">179</span><a name="line.179"></a> |
| <span class="sourceLineNo">180</span> arrayOctect = discardWhitespace(arrayOctect);<a name="line.180"></a> |
| <span class="sourceLineNo">181</span><a name="line.181"></a> |
| <span class="sourceLineNo">182</span> int length = arrayOctect.length;<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> if (length == 0) {<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> // shouldn't a 0 length array be valid base64 data?<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> // return false;<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> return true;<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> }<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> for (int i = 0; i < length; i++) {<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> if (!isBase64(arrayOctect[i])) {<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> return false;<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> }<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> }<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> return true;<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> }<a name="line.194"></a> |
| <span class="sourceLineNo">195</span><a name="line.195"></a> |
| <span class="sourceLineNo">196</span> /**<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> * Discards any whitespace from a base-64 encoded block.<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> *<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> * @param data The base-64 encoded data to discard the whitespace from.<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> * @return The data, less whitespace (see RFC 2045).<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> */<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> static byte[] discardWhitespace(byte[] data) {<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> byte groomedData[] = new byte[data.length];<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> int bytesCopied = 0;<a name="line.204"></a> |
| <span class="sourceLineNo">205</span><a name="line.205"></a> |
| <span class="sourceLineNo">206</span> for (byte aByte : data) {<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> switch (aByte) {<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> case (byte) ' ':<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> case (byte) '\n':<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> case (byte) '\r':<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> case (byte) '\t':<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> break;<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> default:<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> groomedData[bytesCopied++] = aByte;<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> }<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> }<a name="line.216"></a> |
| <span class="sourceLineNo">217</span><a name="line.217"></a> |
| <span class="sourceLineNo">218</span> byte packedData[] = new byte[bytesCopied];<a name="line.218"></a> |
| <span class="sourceLineNo">219</span><a name="line.219"></a> |
| <span class="sourceLineNo">220</span> System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);<a name="line.220"></a> |
| <span class="sourceLineNo">221</span><a name="line.221"></a> |
| <span class="sourceLineNo">222</span> return packedData;<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> }<a name="line.223"></a> |
| <span class="sourceLineNo">224</span><a name="line.224"></a> |
| <span class="sourceLineNo">225</span> /**<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> * Base64 encodes the specified byte array and then encodes it as a String using Shiro's preferred character<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> * encoding (UTF-8).<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> *<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> * @param bytes the byte array to Base64 encode.<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> * @return a UTF-8 encoded String of the resulting Base64 encoded byte array.<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> */<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> public static String encodeToString(byte[] bytes) {<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> byte[] encoded = encode(bytes);<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> return CodecSupport.toString(encoded);<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> }<a name="line.235"></a> |
| <span class="sourceLineNo">236</span><a name="line.236"></a> |
| <span class="sourceLineNo">237</span> /**<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> * Encodes binary data using the base64 algorithm and chunks the encoded output into 76 character blocks<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> *<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> * @param binaryData binary data to encodeToChars<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> * @return Base64 characters chunked in 76 character blocks<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> */<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> public static byte[] encodeChunked(byte[] binaryData) {<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> return encode(binaryData, true);<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> }<a name="line.245"></a> |
| <span class="sourceLineNo">246</span><a name="line.246"></a> |
| <span class="sourceLineNo">247</span> /**<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> * Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64 alphabet.<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> *<a name="line.249"></a> |
| <span class="sourceLineNo">250</span> * @param pArray a byte array containing binary data<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> * @return A byte array containing only Base64 character data<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> */<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> public static byte[] encode(byte[] pArray) {<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> return encode(pArray, false);<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> }<a name="line.255"></a> |
| <span class="sourceLineNo">256</span><a name="line.256"></a> |
| <span class="sourceLineNo">257</span> /**<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> *<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> * @param binaryData Array containing binary data to encodeToChars.<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> * @param isChunked if <code>true</code> this encoder will chunk the base64 output into 76 character blocks<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> * @return Base64-encoded data.<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> * @throws IllegalArgumentException Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> */<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> public static byte[] encode(byte[] binaryData, boolean isChunked) {<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> long binaryDataLength = binaryData.length;<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> long lengthDataBits = binaryDataLength * EIGHTBIT;<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> long fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> long tripletCount = lengthDataBits / TWENTYFOURBITGROUP;<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> long encodedDataLengthLong;<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> int chunckCount = 0;<a name="line.271"></a> |
| <span class="sourceLineNo">272</span><a name="line.272"></a> |
| <span class="sourceLineNo">273</span> if (fewerThan24bits != 0) {<a name="line.273"></a> |
| <span class="sourceLineNo">274</span> // data not divisible by 24 bit<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> encodedDataLengthLong = (tripletCount + 1) * 4;<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> } else {<a name="line.276"></a> |
| <span class="sourceLineNo">277</span> // 16 or 8 bit<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> encodedDataLengthLong = tripletCount * 4;<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> }<a name="line.279"></a> |
| <span class="sourceLineNo">280</span><a name="line.280"></a> |
| <span class="sourceLineNo">281</span> // If the output is to be "chunked" into 76 character sections,<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> // for compliance with RFC 2045 MIME, then it is important to<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> // allow for extra length to account for the separator(s)<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> if (isChunked) {<a name="line.284"></a> |
| <span class="sourceLineNo">285</span><a name="line.285"></a> |
| <span class="sourceLineNo">286</span> chunckCount = (CHUNK_SEPARATOR.length == 0 ? 0 : (int) Math<a name="line.286"></a> |
| <span class="sourceLineNo">287</span> .ceil((float) encodedDataLengthLong / CHUNK_SIZE));<a name="line.287"></a> |
| <span class="sourceLineNo">288</span> encodedDataLengthLong += chunckCount * CHUNK_SEPARATOR.length;<a name="line.288"></a> |
| <span class="sourceLineNo">289</span> }<a name="line.289"></a> |
| <span class="sourceLineNo">290</span><a name="line.290"></a> |
| <span class="sourceLineNo">291</span> if (encodedDataLengthLong > Integer.MAX_VALUE) {<a name="line.291"></a> |
| <span class="sourceLineNo">292</span> throw new IllegalArgumentException(<a name="line.292"></a> |
| <span class="sourceLineNo">293</span> "Input array too big, output array would be bigger than Integer.MAX_VALUE=" + Integer.MAX_VALUE);<a name="line.293"></a> |
| <span class="sourceLineNo">294</span> }<a name="line.294"></a> |
| <span class="sourceLineNo">295</span> int encodedDataLength = (int) encodedDataLengthLong;<a name="line.295"></a> |
| <span class="sourceLineNo">296</span> byte encodedData[] = new byte[encodedDataLength];<a name="line.296"></a> |
| <span class="sourceLineNo">297</span><a name="line.297"></a> |
| <span class="sourceLineNo">298</span> byte k, l, b1, b2, b3;<a name="line.298"></a> |
| <span class="sourceLineNo">299</span><a name="line.299"></a> |
| <span class="sourceLineNo">300</span> int encodedIndex = 0;<a name="line.300"></a> |
| <span class="sourceLineNo">301</span> int dataIndex;<a name="line.301"></a> |
| <span class="sourceLineNo">302</span> int i;<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> int nextSeparatorIndex = CHUNK_SIZE;<a name="line.303"></a> |
| <span class="sourceLineNo">304</span> int chunksSoFar = 0;<a name="line.304"></a> |
| <span class="sourceLineNo">305</span><a name="line.305"></a> |
| <span class="sourceLineNo">306</span> // log.debug("number of triplets = " + numberTriplets);<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> for (i = 0; i < tripletCount; i++) {<a name="line.307"></a> |
| <span class="sourceLineNo">308</span> dataIndex = i * 3;<a name="line.308"></a> |
| <span class="sourceLineNo">309</span> b1 = binaryData[dataIndex];<a name="line.309"></a> |
| <span class="sourceLineNo">310</span> b2 = binaryData[dataIndex + 1];<a name="line.310"></a> |
| <span class="sourceLineNo">311</span> b3 = binaryData[dataIndex + 2];<a name="line.311"></a> |
| <span class="sourceLineNo">312</span><a name="line.312"></a> |
| <span class="sourceLineNo">313</span> // log.debug("b1= " + b1 +", b2= " + b2 + ", b3= " + b3);<a name="line.313"></a> |
| <span class="sourceLineNo">314</span><a name="line.314"></a> |
| <span class="sourceLineNo">315</span> l = (byte) (b2 & 0x0f);<a name="line.315"></a> |
| <span class="sourceLineNo">316</span> k = (byte) (b1 & 0x03);<a name="line.316"></a> |
| <span class="sourceLineNo">317</span><a name="line.317"></a> |
| <span class="sourceLineNo">318</span> byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);<a name="line.318"></a> |
| <span class="sourceLineNo">319</span> byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);<a name="line.319"></a> |
| <span class="sourceLineNo">320</span> byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);<a name="line.320"></a> |
| <span class="sourceLineNo">321</span><a name="line.321"></a> |
| <span class="sourceLineNo">322</span> encodedData[encodedIndex] = lookUpBase64Alphabet[val1];<a name="line.322"></a> |
| <span class="sourceLineNo">323</span> // log.debug( "val2 = " + val2 );<a name="line.323"></a> |
| <span class="sourceLineNo">324</span> // log.debug( "k4 = " + (k<<4) );<a name="line.324"></a> |
| <span class="sourceLineNo">325</span> // log.debug( "vak = " + (val2 | (k<<4)) );<a name="line.325"></a> |
| <span class="sourceLineNo">326</span> encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k << 4)];<a name="line.326"></a> |
| <span class="sourceLineNo">327</span> encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l << 2) | val3];<a name="line.327"></a> |
| <span class="sourceLineNo">328</span> encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];<a name="line.328"></a> |
| <span class="sourceLineNo">329</span><a name="line.329"></a> |
| <span class="sourceLineNo">330</span> encodedIndex += 4;<a name="line.330"></a> |
| <span class="sourceLineNo">331</span><a name="line.331"></a> |
| <span class="sourceLineNo">332</span> // If we are chunking, let's put a chunk separator down.<a name="line.332"></a> |
| <span class="sourceLineNo">333</span> if (isChunked) {<a name="line.333"></a> |
| <span class="sourceLineNo">334</span> // this assumes that CHUNK_SIZE % 4 == 0<a name="line.334"></a> |
| <span class="sourceLineNo">335</span> if (encodedIndex == nextSeparatorIndex) {<a name="line.335"></a> |
| <span class="sourceLineNo">336</span> System.arraycopy(CHUNK_SEPARATOR, 0, encodedData, encodedIndex, CHUNK_SEPARATOR.length);<a name="line.336"></a> |
| <span class="sourceLineNo">337</span> chunksSoFar++;<a name="line.337"></a> |
| <span class="sourceLineNo">338</span> nextSeparatorIndex = (CHUNK_SIZE * (chunksSoFar + 1)) + (chunksSoFar * CHUNK_SEPARATOR.length);<a name="line.338"></a> |
| <span class="sourceLineNo">339</span> encodedIndex += CHUNK_SEPARATOR.length;<a name="line.339"></a> |
| <span class="sourceLineNo">340</span> }<a name="line.340"></a> |
| <span class="sourceLineNo">341</span> }<a name="line.341"></a> |
| <span class="sourceLineNo">342</span> }<a name="line.342"></a> |
| <span class="sourceLineNo">343</span><a name="line.343"></a> |
| <span class="sourceLineNo">344</span> // form integral number of 6-bit groups<a name="line.344"></a> |
| <span class="sourceLineNo">345</span> dataIndex = i * 3;<a name="line.345"></a> |
| <span class="sourceLineNo">346</span><a name="line.346"></a> |
| <span class="sourceLineNo">347</span> if (fewerThan24bits == EIGHTBIT) {<a name="line.347"></a> |
| <span class="sourceLineNo">348</span> b1 = binaryData[dataIndex];<a name="line.348"></a> |
| <span class="sourceLineNo">349</span> k = (byte) (b1 & 0x03);<a name="line.349"></a> |
| <span class="sourceLineNo">350</span> // log.debug("b1=" + b1);<a name="line.350"></a> |
| <span class="sourceLineNo">351</span> // log.debug("b1<<2 = " + (b1>>2) );<a name="line.351"></a> |
| <span class="sourceLineNo">352</span> byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);<a name="line.352"></a> |
| <span class="sourceLineNo">353</span> encodedData[encodedIndex] = lookUpBase64Alphabet[val1];<a name="line.353"></a> |
| <span class="sourceLineNo">354</span> encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];<a name="line.354"></a> |
| <span class="sourceLineNo">355</span> encodedData[encodedIndex + 2] = PAD;<a name="line.355"></a> |
| <span class="sourceLineNo">356</span> encodedData[encodedIndex + 3] = PAD;<a name="line.356"></a> |
| <span class="sourceLineNo">357</span> } else if (fewerThan24bits == SIXTEENBIT) {<a name="line.357"></a> |
| <span class="sourceLineNo">358</span><a name="line.358"></a> |
| <span class="sourceLineNo">359</span> b1 = binaryData[dataIndex];<a name="line.359"></a> |
| <span class="sourceLineNo">360</span> b2 = binaryData[dataIndex + 1];<a name="line.360"></a> |
| <span class="sourceLineNo">361</span> l = (byte) (b2 & 0x0f);<a name="line.361"></a> |
| <span class="sourceLineNo">362</span> k = (byte) (b1 & 0x03);<a name="line.362"></a> |
| <span class="sourceLineNo">363</span><a name="line.363"></a> |
| <span class="sourceLineNo">364</span> byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);<a name="line.364"></a> |
| <span class="sourceLineNo">365</span> byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);<a name="line.365"></a> |
| <span class="sourceLineNo">366</span><a name="line.366"></a> |
| <span class="sourceLineNo">367</span> encodedData[encodedIndex] = lookUpBase64Alphabet[val1];<a name="line.367"></a> |
| <span class="sourceLineNo">368</span> encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k << 4)];<a name="line.368"></a> |
| <span class="sourceLineNo">369</span> encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];<a name="line.369"></a> |
| <span class="sourceLineNo">370</span> encodedData[encodedIndex + 3] = PAD;<a name="line.370"></a> |
| <span class="sourceLineNo">371</span> }<a name="line.371"></a> |
| <span class="sourceLineNo">372</span><a name="line.372"></a> |
| <span class="sourceLineNo">373</span> if (isChunked) {<a name="line.373"></a> |
| <span class="sourceLineNo">374</span> // we also add a separator to the end of the final chunk.<a name="line.374"></a> |
| <span class="sourceLineNo">375</span> if (chunksSoFar < chunckCount) {<a name="line.375"></a> |
| <span class="sourceLineNo">376</span> System.arraycopy(CHUNK_SEPARATOR, 0, encodedData, encodedDataLength - CHUNK_SEPARATOR.length,<a name="line.376"></a> |
| <span class="sourceLineNo">377</span> CHUNK_SEPARATOR.length);<a name="line.377"></a> |
| <span class="sourceLineNo">378</span> }<a name="line.378"></a> |
| <span class="sourceLineNo">379</span> }<a name="line.379"></a> |
| <span class="sourceLineNo">380</span><a name="line.380"></a> |
| <span class="sourceLineNo">381</span> return encodedData;<a name="line.381"></a> |
| <span class="sourceLineNo">382</span> }<a name="line.382"></a> |
| <span class="sourceLineNo">383</span><a name="line.383"></a> |
| <span class="sourceLineNo">384</span> /**<a name="line.384"></a> |
| <span class="sourceLineNo">385</span> * Converts the specified UTF-8 Base64 encoded String and decodes it to a resultant UTF-8 encoded string.<a name="line.385"></a> |
| <span class="sourceLineNo">386</span> *<a name="line.386"></a> |
| <span class="sourceLineNo">387</span> * @param base64Encoded a UTF-8 Base64 encoded String<a name="line.387"></a> |
| <span class="sourceLineNo">388</span> * @return the decoded String, UTF-8 encoded.<a name="line.388"></a> |
| <span class="sourceLineNo">389</span> */<a name="line.389"></a> |
| <span class="sourceLineNo">390</span> public static String decodeToString(String base64Encoded) {<a name="line.390"></a> |
| <span class="sourceLineNo">391</span> byte[] encodedBytes = CodecSupport.toBytes(base64Encoded);<a name="line.391"></a> |
| <span class="sourceLineNo">392</span> return decodeToString(encodedBytes);<a name="line.392"></a> |
| <span class="sourceLineNo">393</span> }<a name="line.393"></a> |
| <span class="sourceLineNo">394</span><a name="line.394"></a> |
| <span class="sourceLineNo">395</span> /**<a name="line.395"></a> |
| <span class="sourceLineNo">396</span> * Decodes the specified Base64 encoded byte array and returns the decoded result as a UTF-8 encoded.<a name="line.396"></a> |
| <span class="sourceLineNo">397</span> *<a name="line.397"></a> |
| <span class="sourceLineNo">398</span> * @param base64Encoded a Base64 encoded byte array<a name="line.398"></a> |
| <span class="sourceLineNo">399</span> * @return the decoded String, UTF-8 encoded.<a name="line.399"></a> |
| <span class="sourceLineNo">400</span> */<a name="line.400"></a> |
| <span class="sourceLineNo">401</span> public static String decodeToString(byte[] base64Encoded) {<a name="line.401"></a> |
| <span class="sourceLineNo">402</span> byte[] decoded = decode(base64Encoded);<a name="line.402"></a> |
| <span class="sourceLineNo">403</span> return CodecSupport.toString(decoded);<a name="line.403"></a> |
| <span class="sourceLineNo">404</span> }<a name="line.404"></a> |
| <span class="sourceLineNo">405</span><a name="line.405"></a> |
| <span class="sourceLineNo">406</span> /**<a name="line.406"></a> |
| <span class="sourceLineNo">407</span> * Converts the specified UTF-8 Base64 encoded String and decodes it to a raw Base64 decoded byte array.<a name="line.407"></a> |
| <span class="sourceLineNo">408</span> *<a name="line.408"></a> |
| <span class="sourceLineNo">409</span> * @param base64Encoded a UTF-8 Base64 encoded String<a name="line.409"></a> |
| <span class="sourceLineNo">410</span> * @return the raw Base64 decoded byte array.<a name="line.410"></a> |
| <span class="sourceLineNo">411</span> */<a name="line.411"></a> |
| <span class="sourceLineNo">412</span> public static byte[] decode(String base64Encoded) {<a name="line.412"></a> |
| <span class="sourceLineNo">413</span> byte[] bytes = CodecSupport.toBytes(base64Encoded);<a name="line.413"></a> |
| <span class="sourceLineNo">414</span> return decode(bytes);<a name="line.414"></a> |
| <span class="sourceLineNo">415</span> }<a name="line.415"></a> |
| <span class="sourceLineNo">416</span><a name="line.416"></a> |
| <span class="sourceLineNo">417</span> /**<a name="line.417"></a> |
| <span class="sourceLineNo">418</span> * Decodes Base64 data into octects<a name="line.418"></a> |
| <span class="sourceLineNo">419</span> *<a name="line.419"></a> |
| <span class="sourceLineNo">420</span> * @param base64Data Byte array containing Base64 data<a name="line.420"></a> |
| <span class="sourceLineNo">421</span> * @return Array containing decoded data.<a name="line.421"></a> |
| <span class="sourceLineNo">422</span> */<a name="line.422"></a> |
| <span class="sourceLineNo">423</span> public static byte[] decode(byte[] base64Data) {<a name="line.423"></a> |
| <span class="sourceLineNo">424</span> // RFC 2045 requires that we discard ALL non-Base64 characters<a name="line.424"></a> |
| <span class="sourceLineNo">425</span> base64Data = discardNonBase64(base64Data);<a name="line.425"></a> |
| <span class="sourceLineNo">426</span><a name="line.426"></a> |
| <span class="sourceLineNo">427</span> // handle the edge case, so we don't have to worry about it later<a name="line.427"></a> |
| <span class="sourceLineNo">428</span> if (base64Data.length == 0) {<a name="line.428"></a> |
| <span class="sourceLineNo">429</span> return new byte[0];<a name="line.429"></a> |
| <span class="sourceLineNo">430</span> }<a name="line.430"></a> |
| <span class="sourceLineNo">431</span><a name="line.431"></a> |
| <span class="sourceLineNo">432</span> int numberQuadruple = base64Data.length / FOURBYTE;<a name="line.432"></a> |
| <span class="sourceLineNo">433</span> byte decodedData[];<a name="line.433"></a> |
| <span class="sourceLineNo">434</span> byte b1, b2, b3, b4, marker0, marker1;<a name="line.434"></a> |
| <span class="sourceLineNo">435</span><a name="line.435"></a> |
| <span class="sourceLineNo">436</span> // Throw away anything not in base64Data<a name="line.436"></a> |
| <span class="sourceLineNo">437</span><a name="line.437"></a> |
| <span class="sourceLineNo">438</span> int encodedIndex = 0;<a name="line.438"></a> |
| <span class="sourceLineNo">439</span> int dataIndex;<a name="line.439"></a> |
| <span class="sourceLineNo">440</span> {<a name="line.440"></a> |
| <span class="sourceLineNo">441</span> // this sizes the output array properly - rlw<a name="line.441"></a> |
| <span class="sourceLineNo">442</span> int lastData = base64Data.length;<a name="line.442"></a> |
| <span class="sourceLineNo">443</span> // ignore the '=' padding<a name="line.443"></a> |
| <span class="sourceLineNo">444</span> while (base64Data[lastData - 1] == PAD) {<a name="line.444"></a> |
| <span class="sourceLineNo">445</span> if (--lastData == 0) {<a name="line.445"></a> |
| <span class="sourceLineNo">446</span> return new byte[0];<a name="line.446"></a> |
| <span class="sourceLineNo">447</span> }<a name="line.447"></a> |
| <span class="sourceLineNo">448</span> }<a name="line.448"></a> |
| <span class="sourceLineNo">449</span> decodedData = new byte[lastData - numberQuadruple];<a name="line.449"></a> |
| <span class="sourceLineNo">450</span> }<a name="line.450"></a> |
| <span class="sourceLineNo">451</span><a name="line.451"></a> |
| <span class="sourceLineNo">452</span> for (int i = 0; i < numberQuadruple; i++) {<a name="line.452"></a> |
| <span class="sourceLineNo">453</span> dataIndex = i * 4;<a name="line.453"></a> |
| <span class="sourceLineNo">454</span> marker0 = base64Data[dataIndex + 2];<a name="line.454"></a> |
| <span class="sourceLineNo">455</span> marker1 = base64Data[dataIndex + 3];<a name="line.455"></a> |
| <span class="sourceLineNo">456</span><a name="line.456"></a> |
| <span class="sourceLineNo">457</span> b1 = base64Alphabet[base64Data[dataIndex]];<a name="line.457"></a> |
| <span class="sourceLineNo">458</span> b2 = base64Alphabet[base64Data[dataIndex + 1]];<a name="line.458"></a> |
| <span class="sourceLineNo">459</span><a name="line.459"></a> |
| <span class="sourceLineNo">460</span> if (marker0 != PAD && marker1 != PAD) {<a name="line.460"></a> |
| <span class="sourceLineNo">461</span> // No PAD e.g 3cQl<a name="line.461"></a> |
| <span class="sourceLineNo">462</span> b3 = base64Alphabet[marker0];<a name="line.462"></a> |
| <span class="sourceLineNo">463</span> b4 = base64Alphabet[marker1];<a name="line.463"></a> |
| <span class="sourceLineNo">464</span><a name="line.464"></a> |
| <span class="sourceLineNo">465</span> decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);<a name="line.465"></a> |
| <span class="sourceLineNo">466</span> decodedData[encodedIndex + 1] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));<a name="line.466"></a> |
| <span class="sourceLineNo">467</span> decodedData[encodedIndex + 2] = (byte) (b3 << 6 | b4);<a name="line.467"></a> |
| <span class="sourceLineNo">468</span> } else if (marker0 == PAD) {<a name="line.468"></a> |
| <span class="sourceLineNo">469</span> // Two PAD e.g. 3c[Pad][Pad]<a name="line.469"></a> |
| <span class="sourceLineNo">470</span> decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);<a name="line.470"></a> |
| <span class="sourceLineNo">471</span> } else {<a name="line.471"></a> |
| <span class="sourceLineNo">472</span> // One PAD e.g. 3cQ[Pad]<a name="line.472"></a> |
| <span class="sourceLineNo">473</span> b3 = base64Alphabet[marker0];<a name="line.473"></a> |
| <span class="sourceLineNo">474</span> decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);<a name="line.474"></a> |
| <span class="sourceLineNo">475</span> decodedData[encodedIndex + 1] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));<a name="line.475"></a> |
| <span class="sourceLineNo">476</span> }<a name="line.476"></a> |
| <span class="sourceLineNo">477</span> encodedIndex += 3;<a name="line.477"></a> |
| <span class="sourceLineNo">478</span> }<a name="line.478"></a> |
| <span class="sourceLineNo">479</span> return decodedData;<a name="line.479"></a> |
| <span class="sourceLineNo">480</span> }<a name="line.480"></a> |
| <span class="sourceLineNo">481</span><a name="line.481"></a> |
| <span class="sourceLineNo">482</span> /**<a name="line.482"></a> |
| <span class="sourceLineNo">483</span> * Discards any characters outside of the base64 alphabet, per the requirements on page 25 of RFC 2045 - "Any<a name="line.483"></a> |
| <span class="sourceLineNo">484</span> * characters outside of the base64 alphabet are to be ignored in base64 encoded data."<a name="line.484"></a> |
| <span class="sourceLineNo">485</span> *<a name="line.485"></a> |
| <span class="sourceLineNo">486</span> * @param data The base-64 encoded data to groom<a name="line.486"></a> |
| <span class="sourceLineNo">487</span> * @return The data, less non-base64 characters (see RFC 2045).<a name="line.487"></a> |
| <span class="sourceLineNo">488</span> */<a name="line.488"></a> |
| <span class="sourceLineNo">489</span> static byte[] discardNonBase64(byte[] data) {<a name="line.489"></a> |
| <span class="sourceLineNo">490</span> byte groomedData[] = new byte[data.length];<a name="line.490"></a> |
| <span class="sourceLineNo">491</span> int bytesCopied = 0;<a name="line.491"></a> |
| <span class="sourceLineNo">492</span><a name="line.492"></a> |
| <span class="sourceLineNo">493</span> for (byte aByte : data) {<a name="line.493"></a> |
| <span class="sourceLineNo">494</span> if (isBase64(aByte)) {<a name="line.494"></a> |
| <span class="sourceLineNo">495</span> groomedData[bytesCopied++] = aByte;<a name="line.495"></a> |
| <span class="sourceLineNo">496</span> }<a name="line.496"></a> |
| <span class="sourceLineNo">497</span> }<a name="line.497"></a> |
| <span class="sourceLineNo">498</span><a name="line.498"></a> |
| <span class="sourceLineNo">499</span> byte packedData[] = new byte[bytesCopied];<a name="line.499"></a> |
| <span class="sourceLineNo">500</span><a name="line.500"></a> |
| <span class="sourceLineNo">501</span> System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);<a name="line.501"></a> |
| <span class="sourceLineNo">502</span><a name="line.502"></a> |
| <span class="sourceLineNo">503</span> return packedData;<a name="line.503"></a> |
| <span class="sourceLineNo">504</span> }<a name="line.504"></a> |
| <span class="sourceLineNo">505</span><a name="line.505"></a> |
| <span class="sourceLineNo">506</span>}<a name="line.506"></a> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| </pre> |
| </div> |
| </body> |
| </html> |
