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<FONT color="green">001</FONT> /*<a name="line.1"></a>
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<FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
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<FONT color="green">003</FONT> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a>
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<FONT color="green">004</FONT> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
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<FONT color="green">005</FONT> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
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<FONT color="green">006</FONT> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
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<FONT color="green">007</FONT> * the License. You may obtain a copy of the License at<a name="line.7"></a>
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<FONT color="green">008</FONT> * <a name="line.8"></a>
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<FONT color="green">009</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
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<FONT color="green">010</FONT> * <a name="line.10"></a>
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<FONT color="green">011</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
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<FONT color="green">012</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
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<FONT color="green">013</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
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<FONT color="green">014</FONT> * See the License for the specific language governing permissions and<a name="line.14"></a>
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<FONT color="green">015</FONT> * limitations under the License.<a name="line.15"></a>
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<FONT color="green">016</FONT> */<a name="line.16"></a>
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<FONT color="green">017</FONT> <a name="line.17"></a>
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<FONT color="green">018</FONT> package org.apache.commons.codec.binary;<a name="line.18"></a>
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<FONT color="green">019</FONT> <a name="line.19"></a>
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<FONT color="green">020</FONT> import java.io.FilterOutputStream;<a name="line.20"></a>
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<FONT color="green">021</FONT> import java.io.IOException;<a name="line.21"></a>
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<FONT color="green">022</FONT> import java.io.OutputStream;<a name="line.22"></a>
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<FONT color="green">023</FONT> <a name="line.23"></a>
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<FONT color="green">024</FONT> /**<a name="line.24"></a>
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<FONT color="green">025</FONT> * Provides Base64 encoding and decoding in a streaming fashion (unlimited size). When encoding the default lineLength<a name="line.25"></a>
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<FONT color="green">026</FONT> * is 76 characters and the default lineEnding is CRLF, but these can be overridden by using the appropriate<a name="line.26"></a>
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<FONT color="green">027</FONT> * constructor.<a name="line.27"></a>
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<FONT color="green">028</FONT> * <p><a name="line.28"></a>
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<FONT color="green">029</FONT> * The default behaviour of the Base64OutputStream is to ENCODE, whereas the default behaviour of the Base64InputStream<a name="line.29"></a>
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<FONT color="green">030</FONT> * is to DECODE. But this behaviour can be overridden by using a different constructor.<a name="line.30"></a>
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<FONT color="green">031</FONT> * </p><a name="line.31"></a>
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<FONT color="green">032</FONT> * <p><a name="line.32"></a>
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<FONT color="green">033</FONT> * This class implements section <cite>6.8. Base64 Content-Transfer-Encoding</cite> from RFC 2045 <cite>Multipurpose<a name="line.33"></a>
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<FONT color="green">034</FONT> * Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies</cite> by Freed and Borenstein.<a name="line.34"></a>
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<FONT color="green">035</FONT> * </p><a name="line.35"></a>
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<FONT color="green">036</FONT> * <p><a name="line.36"></a>
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<FONT color="green">037</FONT> * Since this class operates directly on byte streams, and not character streams, it is hard-coded to only encode/decode<a name="line.37"></a>
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<FONT color="green">038</FONT> * character encodings which are compatible with the lower 127 ASCII chart (ISO-8859-1, Windows-1252, UTF-8, etc).<a name="line.38"></a>
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<FONT color="green">039</FONT> * </p><a name="line.39"></a>
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<FONT color="green">040</FONT> * <a name="line.40"></a>
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<FONT color="green">041</FONT> * @author Apache Software Foundation<a name="line.41"></a>
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<FONT color="green">042</FONT> * @version $Id: Base64OutputStream.java 799806 2009-08-01 04:33:17Z ggregory $<a name="line.42"></a>
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<FONT color="green">043</FONT> * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a><a name="line.43"></a>
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<FONT color="green">044</FONT> * @since 1.4<a name="line.44"></a>
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<FONT color="green">045</FONT> */<a name="line.45"></a>
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<FONT color="green">046</FONT> public class Base64OutputStream extends FilterOutputStream {<a name="line.46"></a>
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<FONT color="green">047</FONT> private final boolean doEncode;<a name="line.47"></a>
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<FONT color="green">048</FONT> <a name="line.48"></a>
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<FONT color="green">049</FONT> private final Base64 base64;<a name="line.49"></a>
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<FONT color="green">050</FONT> <a name="line.50"></a>
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<FONT color="green">051</FONT> private final byte[] singleByte = new byte[1];<a name="line.51"></a>
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<FONT color="green">052</FONT> <a name="line.52"></a>
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<FONT color="green">053</FONT> /**<a name="line.53"></a>
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<FONT color="green">054</FONT> * Creates a Base64OutputStream such that all data written is Base64-encoded to the original provided OutputStream.<a name="line.54"></a>
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<FONT color="green">055</FONT> * <a name="line.55"></a>
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<FONT color="green">056</FONT> * @param out<a name="line.56"></a>
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<FONT color="green">057</FONT> * OutputStream to wrap.<a name="line.57"></a>
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<FONT color="green">058</FONT> */<a name="line.58"></a>
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<FONT color="green">059</FONT> public Base64OutputStream(OutputStream out) {<a name="line.59"></a>
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<FONT color="green">060</FONT> this(out, true);<a name="line.60"></a>
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<FONT color="green">061</FONT> }<a name="line.61"></a>
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<FONT color="green">062</FONT> <a name="line.62"></a>
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<FONT color="green">063</FONT> /**<a name="line.63"></a>
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<FONT color="green">064</FONT> * Creates a Base64OutputStream such that all data written is either Base64-encoded or Base64-decoded to the<a name="line.64"></a>
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<FONT color="green">065</FONT> * original provided OutputStream.<a name="line.65"></a>
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<FONT color="green">066</FONT> * <a name="line.66"></a>
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<FONT color="green">067</FONT> * @param out<a name="line.67"></a>
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<FONT color="green">068</FONT> * OutputStream to wrap.<a name="line.68"></a>
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<FONT color="green">069</FONT> * @param doEncode<a name="line.69"></a>
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<FONT color="green">070</FONT> * true if we should encode all data written to us, false if we should decode.<a name="line.70"></a>
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<FONT color="green">071</FONT> */<a name="line.71"></a>
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<FONT color="green">072</FONT> public Base64OutputStream(OutputStream out, boolean doEncode) {<a name="line.72"></a>
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<FONT color="green">073</FONT> super(out);<a name="line.73"></a>
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<FONT color="green">074</FONT> this.doEncode = doEncode;<a name="line.74"></a>
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<FONT color="green">075</FONT> this.base64 = new Base64();<a name="line.75"></a>
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<FONT color="green">076</FONT> }<a name="line.76"></a>
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<FONT color="green">077</FONT> <a name="line.77"></a>
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<FONT color="green">078</FONT> /**<a name="line.78"></a>
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<FONT color="green">079</FONT> * Creates a Base64OutputStream such that all data written is either Base64-encoded or Base64-decoded to the<a name="line.79"></a>
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<FONT color="green">080</FONT> * original provided OutputStream.<a name="line.80"></a>
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<FONT color="green">081</FONT> * <a name="line.81"></a>
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<FONT color="green">082</FONT> * @param out<a name="line.82"></a>
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<FONT color="green">083</FONT> * OutputStream to wrap.<a name="line.83"></a>
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<FONT color="green">084</FONT> * @param doEncode<a name="line.84"></a>
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<FONT color="green">085</FONT> * true if we should encode all data written to us, false if we should decode.<a name="line.85"></a>
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<FONT color="green">086</FONT> * @param lineLength<a name="line.86"></a>
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<FONT color="green">087</FONT> * If doEncode is true, each line of encoded data will contain lineLength characters (rounded down to<a name="line.87"></a>
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<FONT color="green">088</FONT> * nearest multiple of 4). If lineLength <=0, the encoded data is not divided into lines. If doEncode is<a name="line.88"></a>
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<FONT color="green">089</FONT> * false, lineLength is ignored.<a name="line.89"></a>
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<FONT color="green">090</FONT> * @param lineSeparator<a name="line.90"></a>
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<FONT color="green">091</FONT> * If doEncode is true, each line of encoded data will be terminated with this byte sequence (e.g. \r\n).<a name="line.91"></a>
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<FONT color="green">092</FONT> * If lineLength <= 0, the lineSeparator is not used. If doEncode is false lineSeparator is ignored.<a name="line.92"></a>
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<FONT color="green">093</FONT> */<a name="line.93"></a>
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<FONT color="green">094</FONT> public Base64OutputStream(OutputStream out, boolean doEncode, int lineLength, byte[] lineSeparator) {<a name="line.94"></a>
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<FONT color="green">095</FONT> super(out);<a name="line.95"></a>
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<FONT color="green">096</FONT> this.doEncode = doEncode;<a name="line.96"></a>
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<FONT color="green">097</FONT> this.base64 = new Base64(lineLength, lineSeparator);<a name="line.97"></a>
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<FONT color="green">098</FONT> }<a name="line.98"></a>
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<FONT color="green">099</FONT> <a name="line.99"></a>
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<FONT color="green">100</FONT> /**<a name="line.100"></a>
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<FONT color="green">101</FONT> * Writes the specified <code>byte</code> to this output stream.<a name="line.101"></a>
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<FONT color="green">102</FONT> * <a name="line.102"></a>
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<FONT color="green">103</FONT> * @param i<a name="line.103"></a>
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<FONT color="green">104</FONT> * source byte<a name="line.104"></a>
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<FONT color="green">105</FONT> * @throws IOException<a name="line.105"></a>
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<FONT color="green">106</FONT> * if an I/O error occurs.<a name="line.106"></a>
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<FONT color="green">107</FONT> */<a name="line.107"></a>
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<FONT color="green">108</FONT> public void write(int i) throws IOException {<a name="line.108"></a>
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<FONT color="green">109</FONT> singleByte[0] = (byte) i;<a name="line.109"></a>
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<FONT color="green">110</FONT> write(singleByte, 0, 1);<a name="line.110"></a>
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<FONT color="green">111</FONT> }<a name="line.111"></a>
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<FONT color="green">112</FONT> <a name="line.112"></a>
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<FONT color="green">113</FONT> /**<a name="line.113"></a>
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<FONT color="green">114</FONT> * Writes <code>len</code> bytes from the specified <code>b</code> array starting at <code>offset</code> to this<a name="line.114"></a>
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<FONT color="green">115</FONT> * output stream.<a name="line.115"></a>
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<FONT color="green">116</FONT> * <a name="line.116"></a>
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<FONT color="green">117</FONT> * @param b<a name="line.117"></a>
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<FONT color="green">118</FONT> * source byte array<a name="line.118"></a>
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<FONT color="green">119</FONT> * @param offset<a name="line.119"></a>
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<FONT color="green">120</FONT> * where to start reading the bytes<a name="line.120"></a>
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<FONT color="green">121</FONT> * @param len<a name="line.121"></a>
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<FONT color="green">122</FONT> * maximum number of bytes to write<a name="line.122"></a>
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<FONT color="green">123</FONT> * <a name="line.123"></a>
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<FONT color="green">124</FONT> * @throws IOException<a name="line.124"></a>
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<FONT color="green">125</FONT> * if an I/O error occurs.<a name="line.125"></a>
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<FONT color="green">126</FONT> * @throws NullPointerException<a name="line.126"></a>
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<FONT color="green">127</FONT> * if the byte array parameter is null<a name="line.127"></a>
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<FONT color="green">128</FONT> * @throws IndexOutOfBoundsException<a name="line.128"></a>
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<FONT color="green">129</FONT> * if offset, len or buffer size are invalid<a name="line.129"></a>
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<FONT color="green">130</FONT> */<a name="line.130"></a>
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<FONT color="green">131</FONT> public void write(byte b[], int offset, int len) throws IOException {<a name="line.131"></a>
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<FONT color="green">132</FONT> if (b == null) {<a name="line.132"></a>
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<FONT color="green">133</FONT> throw new NullPointerException();<a name="line.133"></a>
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<FONT color="green">134</FONT> } else if (offset < 0 || len < 0) {<a name="line.134"></a>
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<FONT color="green">135</FONT> throw new IndexOutOfBoundsException();<a name="line.135"></a>
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<FONT color="green">136</FONT> } else if (offset > b.length || offset + len > b.length) {<a name="line.136"></a>
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<FONT color="green">137</FONT> throw new IndexOutOfBoundsException();<a name="line.137"></a>
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<FONT color="green">138</FONT> } else if (len > 0) {<a name="line.138"></a>
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<FONT color="green">139</FONT> if (doEncode) {<a name="line.139"></a>
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<FONT color="green">140</FONT> base64.encode(b, offset, len);<a name="line.140"></a>
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<FONT color="green">141</FONT> } else {<a name="line.141"></a>
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<FONT color="green">142</FONT> base64.decode(b, offset, len);<a name="line.142"></a>
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<FONT color="green">143</FONT> }<a name="line.143"></a>
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<FONT color="green">144</FONT> flush(false);<a name="line.144"></a>
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<FONT color="green">145</FONT> }<a name="line.145"></a>
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<FONT color="green">146</FONT> }<a name="line.146"></a>
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<FONT color="green">147</FONT> <a name="line.147"></a>
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<FONT color="green">148</FONT> /**<a name="line.148"></a>
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<FONT color="green">149</FONT> * Flushes this output stream and forces any buffered output bytes to be written out to the stream. If propogate is<a name="line.149"></a>
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<FONT color="green">150</FONT> * true, the wrapped stream will also be flushed.<a name="line.150"></a>
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<FONT color="green">151</FONT> * <a name="line.151"></a>
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<FONT color="green">152</FONT> * @param propogate<a name="line.152"></a>
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<FONT color="green">153</FONT> * boolean flag to indicate whether the wrapped OutputStream should also be flushed.<a name="line.153"></a>
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<FONT color="green">154</FONT> * @throws IOException<a name="line.154"></a>
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<FONT color="green">155</FONT> * if an I/O error occurs.<a name="line.155"></a>
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<FONT color="green">156</FONT> */<a name="line.156"></a>
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<FONT color="green">157</FONT> private void flush(boolean propogate) throws IOException {<a name="line.157"></a>
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<FONT color="green">158</FONT> int avail = base64.avail();<a name="line.158"></a>
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<FONT color="green">159</FONT> if (avail > 0) {<a name="line.159"></a>
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<FONT color="green">160</FONT> byte[] buf = new byte[avail];<a name="line.160"></a>
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<FONT color="green">161</FONT> int c = base64.readResults(buf, 0, avail);<a name="line.161"></a>
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<FONT color="green">162</FONT> if (c > 0) {<a name="line.162"></a>
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<FONT color="green">163</FONT> out.write(buf, 0, c);<a name="line.163"></a>
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<FONT color="green">164</FONT> }<a name="line.164"></a>
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<FONT color="green">165</FONT> }<a name="line.165"></a>
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<FONT color="green">166</FONT> if (propogate) {<a name="line.166"></a>
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<FONT color="green">167</FONT> out.flush();<a name="line.167"></a>
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<FONT color="green">168</FONT> }<a name="line.168"></a>
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<FONT color="green">169</FONT> }<a name="line.169"></a>
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<FONT color="green">170</FONT> <a name="line.170"></a>
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<FONT color="green">171</FONT> /**<a name="line.171"></a>
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<FONT color="green">172</FONT> * Flushes this output stream and forces any buffered output bytes to be written out to the stream.<a name="line.172"></a>
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<FONT color="green">173</FONT> * <a name="line.173"></a>
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<FONT color="green">174</FONT> * @throws IOException<a name="line.174"></a>
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<FONT color="green">175</FONT> * if an I/O error occurs.<a name="line.175"></a>
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<FONT color="green">176</FONT> */<a name="line.176"></a>
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<FONT color="green">177</FONT> public void flush() throws IOException {<a name="line.177"></a>
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<FONT color="green">178</FONT> flush(true);<a name="line.178"></a>
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<FONT color="green">179</FONT> }<a name="line.179"></a>
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<FONT color="green">180</FONT> <a name="line.180"></a>
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<FONT color="green">181</FONT> /**<a name="line.181"></a>
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<FONT color="green">182</FONT> * Closes this output stream and releases any system resources associated with the stream.<a name="line.182"></a>
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<FONT color="green">183</FONT> * <a name="line.183"></a>
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<FONT color="green">184</FONT> * @throws IOException<a name="line.184"></a>
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<FONT color="green">185</FONT> * if an I/O error occurs.<a name="line.185"></a>
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<FONT color="green">186</FONT> */<a name="line.186"></a>
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<FONT color="green">187</FONT> public void close() throws IOException {<a name="line.187"></a>
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<FONT color="green">188</FONT> // Notify encoder of EOF (-1).<a name="line.188"></a>
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<FONT color="green">189</FONT> if (doEncode) {<a name="line.189"></a>
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<FONT color="green">190</FONT> base64.encode(singleByte, 0, -1);<a name="line.190"></a>
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<FONT color="green">191</FONT> } else {<a name="line.191"></a>
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<FONT color="green">192</FONT> base64.decode(singleByte, 0, -1);<a name="line.192"></a>
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<FONT color="green">193</FONT> }<a name="line.193"></a>
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<FONT color="green">194</FONT> flush();<a name="line.194"></a>
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<FONT color="green">195</FONT> out.close();<a name="line.195"></a>
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<FONT color="green">196</FONT> }<a name="line.196"></a>
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<FONT color="green">197</FONT> <a name="line.197"></a>
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<FONT color="green">198</FONT> }<a name="line.198"></a>