9b267f8f3b
git-svn-id: https://osmand.googlecode.com/svn/trunk@183 e29c36b1-1cfa-d876-8d93-3434fc2bb7b8
93 lines
No EOL
4.1 KiB
Java
93 lines
No EOL
4.1 KiB
Java
package com.osmand;
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/**
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* @source http://www.javaworld.com/javaworld/javatips/jw-javatip47.html -- 24.11.2008, (mb)
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*/
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public class Base64 {
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/*******************************************************************************************************************
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* BASE 64 encoding of a String or an array of bytes. See also RFC 1421.
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*
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* @author Unknown
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* @author David W. Croft
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* @version 1998-06-08
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******************************************************************************************************************/
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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public static final char[] alphabet = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 0 to 7
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 8 to 15
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 16 to 23
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', // 24 to 31
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 32 to 39
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v', // 40 to 47
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'w', 'x', 'y', 'z', '0', '1', '2', '3', // 48 to 55
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'4', '5', '6', '7', '8', '9', '+', '/' }; // 56 to 63
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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public static String encode(final String s)
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//////////////////////////////////////////////////////////////////////
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{
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return encode(s.getBytes());
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}
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public static String encode(final byte[] octetString)
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//////////////////////////////////////////////////////////////////////
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{
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int bits24;
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int bits6;
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final char[] out = new char[((octetString.length - 1) / 3 + 1) * 4];
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int outIndex = 0;
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int i = 0;
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while ((i + 3) <= octetString.length) {
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// store the octets
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bits24 = (octetString[i++] & 0xFF) << 16;
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bits24 |= (octetString[i++] & 0xFF) << 8;
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bits24 |= (octetString[i++] & 0xFF) << 0;
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bits6 = (bits24 & 0x00FC0000) >> 18;
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out[outIndex++] = alphabet[bits6];
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bits6 = (bits24 & 0x0003F000) >> 12;
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out[outIndex++] = alphabet[bits6];
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bits6 = (bits24 & 0x00000FC0) >> 6;
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out[outIndex++] = alphabet[bits6];
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bits6 = (bits24 & 0x0000003F);
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out[outIndex++] = alphabet[bits6];
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}
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if (octetString.length - i == 2) {
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// store the octets
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bits24 = (octetString[i] & 0xFF) << 16;
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bits24 |= (octetString[i + 1] & 0xFF) << 8;
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bits6 = (bits24 & 0x00FC0000) >> 18;
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out[outIndex++] = alphabet[bits6];
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bits6 = (bits24 & 0x0003F000) >> 12;
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out[outIndex++] = alphabet[bits6];
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bits6 = (bits24 & 0x00000FC0) >> 6;
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out[outIndex++] = alphabet[bits6];
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// padding
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out[outIndex++] = '=';
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} else if (octetString.length - i == 1) {
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// store the octets
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bits24 = (octetString[i] & 0xFF) << 16;
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bits6 = (bits24 & 0x00FC0000) >> 18;
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out[outIndex++] = alphabet[bits6];
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bits6 = (bits24 & 0x0003F000) >> 12;
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out[outIndex++] = alphabet[bits6];
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// padding
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out[outIndex++] = '=';
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out[outIndex++] = '=';
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}
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return new String(out);
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}
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} |