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Add a README, and slightly modified fork of Base64Coder.java
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‎Base64Coder.java‎

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// Copyright 2003-2010 Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland
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// www.source-code.biz, www.inventec.ch/chdh
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//
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// This module is multi-licensed and may be used under the terms
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// of any of the following licenses:
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//
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// EPL, Eclipse Public License, V1.0 or later, http://www.eclipse.org/legal
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// LGPL, GNU Lesser General Public License, V2.1 or later, http://www.gnu.org/licenses/lgpl.html
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// GPL, GNU General Public License, V2 or later, http://www.gnu.org/licenses/gpl.html
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// AL, Apache License, V2.0 or later, http://www.apache.org/licenses
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// BSD, BSD License, http://www.opensource.org/licenses/bsd-license.php
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// MIT, MIT License, http://www.opensource.org/licenses/MIT
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//
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// Please contact the author if you need another license.
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// This module is provided "as is", without warranties of any kind.
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//package base64Coder;
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/**
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* A Base64 encoder/decoder.
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*
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* <p>
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* This class is used to encode and decode data in Base64 format as described in RFC 1521.
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*
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* <p>
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* Project home page: <a href="http://www.source-code.biz/base64coder/java/">www.source-code.biz/base64coder/java</a><br>
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* Author: Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland<br>
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* Multi-licensed: EPL / LGPL / GPL / AL / BSD / MIT.
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*/
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public class Base64Coder {
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// The line separator string of the operating system.
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private static final String systemLineSeparator = System.getProperty("line.separator");
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// Mapping table from 6-bit nibbles to Base64 characters.
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private static final char[] map1 = new char[64];
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static {
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int i=0;
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for (char c='A'; c<='Z'; c++) map1[i++] = c;
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for (char c='a'; c<='z'; c++) map1[i++] = c;
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for (char c='0'; c<='9'; c++) map1[i++] = c;
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map1[i++] = '+'; map1[i++] = '/'; }
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// Mapping table from Base64 characters to 6-bit nibbles.
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private static final byte[] map2 = new byte[128];
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static {
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for (int i=0; i<map2.length; i++) map2[i] = -1;
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for (int i=0; i<64; i++) map2[map1[i]] = (byte)i; }
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/**
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* Encodes a string into Base64 format.
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* No blanks or line breaks are inserted.
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* @param s A String to be encoded.
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* @return A String containing the Base64 encoded data.
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*/
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public static String encodeString (String s) {
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return new String(encode(s.getBytes())); }
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/**
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* Encodes a byte array into Base 64 format and breaks the output into lines of 76 characters.
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* This method is compatible with <code>sun.misc.BASE64Encoder.encodeBuffer(byte[])</code>.
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* @param in An array containing the data bytes to be encoded.
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* @return A String containing the Base64 encoded data, broken into lines.
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*/
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public static String encodeLines (byte[] in) {
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return encodeLines(in, 0, in.length, 76, systemLineSeparator); }
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/**
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* Encodes a byte array into Base 64 format and breaks the output into lines.
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* @param in An array containing the data bytes to be encoded.
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* @param iOff Offset of the first byte in <code>in</code> to be processed.
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* @param iLen Number of bytes to be processed in <code>in</code>, starting at <code>iOff</code>.
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* @param lineLen Line length for the output data. Should be a multiple of 4.
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* @param lineSeparator The line separator to be used to separate the output lines.
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* @return A String containing the Base64 encoded data, broken into lines.
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*/
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public static String encodeLines (byte[] in, int iOff, int iLen, int lineLen, String lineSeparator) {
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int blockLen = (lineLen*3) / 4;
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if (blockLen <= 0) throw new IllegalArgumentException();
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int lines = (iLen+blockLen-1) / blockLen;
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int bufLen = ((iLen+2)/3)*4 + lines*lineSeparator.length();
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StringBuilder buf = new StringBuilder(bufLen);
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int ip = 0;
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while (ip < iLen) {
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int l = Math.min(iLen-ip, blockLen);
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buf.append (encode(in, iOff+ip, l));
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buf.append (lineSeparator);
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ip += l; }
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return buf.toString(); }
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/**
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* Encodes a byte array into Base64 format.
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* No blanks or line breaks are inserted in the output.
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* @param in An array containing the data bytes to be encoded.
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* @return A character array containing the Base64 encoded data.
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*/
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public static char[] encode (byte[] in) {
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return encode(in, 0, in.length); }
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/**
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* Encodes a byte array into Base64 format.
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* No blanks or line breaks are inserted in the output.
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* @param in An array containing the data bytes to be encoded.
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* @param iLen Number of bytes to process in <code>in</code>.
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* @return A character array containing the Base64 encoded data.
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*/
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public static char[] encode (byte[] in, int iLen) {
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return encode(in, 0, iLen); }
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/**
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* Encodes a byte array into Base64 format.
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* No blanks or line breaks are inserted in the output.
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* @param in An array containing the data bytes to be encoded.
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* @param iOff Offset of the first byte in <code>in</code> to be processed.
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* @param iLen Number of bytes to process in <code>in</code>, starting at <code>iOff</code>.
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* @return A character array containing the Base64 encoded data.
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*/
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public static char[] encode (byte[] in, int iOff, int iLen) {
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int oDataLen = (iLen*4+2)/3; // output length without padding
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int oLen = ((iLen+2)/3)*4; // output length including padding
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char[] out = new char[oLen];
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int ip = iOff;
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int iEnd = iOff + iLen;
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int op = 0;
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while (ip < iEnd) {
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int i0 = in[ip++] & 0xff;
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int i1 = ip < iEnd ? in[ip++] & 0xff : 0;
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int i2 = ip < iEnd ? in[ip++] & 0xff : 0;
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int o0 = i0 >>> 2;
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int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
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int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
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int o3 = i2 & 0x3F;
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out[op++] = map1[o0];
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out[op++] = map1[o1];
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out[op] = op < oDataLen ? map1[o2] : '='; op++;
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out[op] = op < oDataLen ? map1[o3] : '='; op++; }
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return out; }
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/**
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* Decodes a string from Base64 format.
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* No blanks or line breaks are allowed within the Base64 encoded input data.
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* @param s A Base64 String to be decoded.
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* @return A String containing the decoded data.
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* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
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*/
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public static String decodeString (String s) {
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return new String(decode(s)); }
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/**
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* Decodes a byte array from Base64 format and ignores line separators, tabs and blanks.
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* CR, LF, Tab and Space characters are ignored in the input data.
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* This method is compatible with <code>sun.misc.BASE64Decoder.decodeBuffer(String)</code>.
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* @param s A Base64 String to be decoded.
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* @return An array containing the decoded data bytes.
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* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
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*/
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public static byte[] decodeLines (String s) {
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char[] buf = new char[s.length()];
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int p = 0;
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for (int ip = 0; ip < s.length(); ip++) {
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char c = s.charAt(ip);
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if (c != ' ' && c != '\r' && c != '\n' && c != '\t')
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buf[p++] = c; }
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return decode(buf, 0, p); }
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/**
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* Decodes a byte array from Base64 format.
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* No blanks or line breaks are allowed within the Base64 encoded input data.
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* @param s A Base64 String to be decoded.
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* @return An array containing the decoded data bytes.
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* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
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*/
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public static byte[] decode (String s) {
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return decode(s.toCharArray()); }
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/**
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* Decodes a byte array from Base64 format.
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* No blanks or line breaks are allowed within the Base64 encoded input data.
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* @param in A character array containing the Base64 encoded data.
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* @return An array containing the decoded data bytes.
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* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
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*/
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public static byte[] decode (char[] in) {
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return decode(in, 0, in.length); }
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/**
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* Decodes a byte array from Base64 format.
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* No blanks or line breaks are allowed within the Base64 encoded input data.
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* @param in A character array containing the Base64 encoded data.
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* @param iOff Offset of the first character in <code>in</code> to be processed.
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* @param iLen Number of characters to process in <code>in</code>, starting at <code>iOff</code>.
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* @return An array containing the decoded data bytes.
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* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
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*/
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public static byte[] decode (char[] in, int iOff, int iLen) {
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if (iLen%4 != 0) throw new IllegalArgumentException ("Length of Base64 encoded input string is not a multiple of 4.");
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while (iLen > 0 && in[iOff+iLen-1] == '=') iLen--;
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int oLen = (iLen*3) / 4;
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byte[] out = new byte[oLen];
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int ip = iOff;
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int iEnd = iOff + iLen;
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int op = 0;
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while (ip < iEnd) {
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int i0 = in[ip++];
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int i1 = in[ip++];
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int i2 = ip < iEnd ? in[ip++] : 'A';
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int i3 = ip < iEnd ? in[ip++] : 'A';
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if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
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throw new IllegalArgumentException ("Illegal character in Base64 encoded data.");
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int b0 = map2[i0];
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int b1 = map2[i1];
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int b2 = map2[i2];
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int b3 = map2[i3];
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if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
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throw new IllegalArgumentException ("Illegal character in Base64 encoded data.");
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int o0 = ( b0 <<2) | (b1>>>4);
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int o1 = ((b1 & 0xf)<<4) | (b2>>>2);
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int o2 = ((b2 & 3)<<6) | b3;
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out[op++] = (byte)o0;
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if (op<oLen) out[op++] = (byte)o1;
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if (op<oLen) out[op++] = (byte)o2; }
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return out; }
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// Dummy constructor.
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private Base64Coder() {}
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} // end class Base64Coder

‎README‎

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ExportPriv project page: https://code.google.com/p/java-exporw/
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