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package com.calclab.emite.core.client.xmpp.sasl; /*from www .java2 s .com*/ /** * A Base64 Encoder/Decoder. * * <p> * This class is used to encode and decode data in Base64 format as described in * RFC 1521. * * <p> * This is "Open Source" software and released under the <a * href="http://www.gnu.org/licenses/lgpl.html">GNU/LGPL</a> license.<br> * It is provided "as is" without warranty of any kind.<br> * Copyright 2003: Christian d'Heureuse, Inventec Informatik AG, Switzerland.<br> * Home page: <a href="http://www.source-code.biz">www.source-code.biz</a><br> * * <p> * Version history:<br> * 2003-07-22 Christian d'Heureuse (chdh): Module created.<br> * 2005-08-11 chdh: Lincense changed from GPL to LGPL.<br> * 2006-11-21 chdh:<br> * Method encode(String) renamed to encodeString(String).<br> * Method decode(String) renamed to decodeString(String).<br> * New method encode(byte[],int) added.<br> * New method decode(String) added.<br> */ public class Base64Coder { // Mapping table from 6-bit nibbles to Base64 characters. private static char[] map1 = new char[64]; // Mapping table from Base64 characters to 6-bit nibbles. private static byte[] map2 = new byte[128]; static { int i = 0; for (char c = 'A'; c <= 'Z'; c++) { map1[i++] = c; } for (char c = 'a'; c <= 'z'; c++) { map1[i++] = c; } for (char c = '0'; c <= '9'; c++) { map1[i++] = c; } map1[i++] = '+'; map1[i++] = '/'; } static { for (int i = 0; i < map2.length; i++) { map2[i] = -1; } for (int i = 0; i < 64; i++) { map2[map1[i]] = (byte) i; } } /** * Decodes a byte array from Base64 format. No blanks or line breaks are * allowed within the Base64 encoded data. * * @param in * a character array containing the Base64 encoded data. * @return An array containing the decoded data bytes. * @throws IllegalArgumentException * if the input is not valid Base64 encoded data. */ public static byte[] decode(final char[] in) { int iLen = in.length; if (iLen % 4 != 0) { throw new IllegalArgumentException("Length of Base64 encoded input string is not a multiple of 4."); } while (iLen > 0 && in[iLen - 1] == '=') { iLen--; } final int oLen = iLen * 3 / 4; final byte[] out = new byte[oLen]; int ip = 0; int op = 0; while (ip < iLen) { final int i0 = in[ip++]; final int i1 = in[ip++]; final int i2 = ip < iLen ? in[ip++] : 'A'; final int i3 = ip < iLen ? in[ip++] : 'A'; if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127) { throw new IllegalArgumentException("Illegal character in Base64 encoded data."); } final int b0 = map2[i0]; final int b1 = map2[i1]; final int b2 = map2[i2]; final int b3 = map2[i3]; if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0) { throw new IllegalArgumentException("Illegal character in Base64 encoded data."); } final int o0 = b0 << 2 | b1 >>> 4; final int o1 = (b1 & 0xf) << 4 | b2 >>> 2; final int o2 = (b2 & 3) << 6 | b3; out[op++] = (byte) o0; if (op < oLen) { out[op++] = (byte) o1; } if (op < oLen) { out[op++] = (byte) o2; } } return out; } /** * Decodes a byte array from Base64 format. * * @param s * a Base64 String to be decoded. * @return An array containing the decoded data bytes. * @throws IllegalArgumentException * if the input is not valid Base64 encoded data. */ public static byte[] decode(final String s) { return decode(s.toCharArray()); } /** * Decodes a string from Base64 format. * * @param s * a Base64 String to be decoded. * @return A String containing the decoded data. * @throws IllegalArgumentException * if the input is not valid Base64 encoded data. */ public static String decodeString(final String s) { return new String(toChar(decode(s))); } /** * Encodes a byte array into Base64 format. No blanks or line breaks are * inserted. * * @param in * an array containing the data bytes to be encoded. * @return A character array with the Base64 encoded data. */ public static char[] encode(final byte[] in) { return encode(in, in.length); } /** * Encodes a byte array into Base64 format. No blanks or line breaks are * inserted. * * @param in * an array containing the data bytes to be encoded. * @param iLen * number of bytes to process in <code>in</code>. * @return A character array with the Base64 encoded data. */ public static char[] encode(final byte[] in, final int iLen) { final int oDataLen = (iLen * 4 + 2) / 3; // output length without // padding final int oLen = (iLen + 2) / 3 * 4; // output length including // padding final char[] out = new char[oLen]; int ip = 0; int op = 0; while (ip < iLen) { final int i0 = in[ip++] & 0xff; final int i1 = ip < iLen ? in[ip++] & 0xff : 0; final int i2 = ip < iLen ? in[ip++] & 0xff : 0; final int o0 = i0 >>> 2; final int o1 = (i0 & 3) << 4 | i1 >>> 4; final int o2 = (i1 & 0xf) << 2 | i2 >>> 6; final int o3 = i2 & 0x3F; out[op++] = map1[o0]; out[op++] = map1[o1]; out[op] = op < oDataLen ? map1[o2] : '='; op++; out[op] = op < oDataLen ? map1[o3] : '='; op++; } return out; } /** * Encodes a string into Base64 format. No blanks or line breaks are * inserted. * * @param s * a String to be encoded. * @return A String with the Base64 encoded data. */ public static String encodeString(final String s) { return new String(encode(toByte(s.toCharArray()))); } private static byte[] toByte(final char[] chars) { final byte[] bytes = new byte[chars.length]; for (int index = 0; index < chars.length; index++) { bytes[index] = (byte) chars[index]; } return bytes; } private static char[] toChar(final byte[] bytes) { final char[] chars = new char[bytes.length]; for (int index = 0; index < chars.length; index++) { chars[index] = (char) bytes[index]; } return chars; } // Dummy constructor. private Base64Coder() { } } // end class Base64Coder