Tools.java

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package org.jwebsocket.client.me;

/**
 * Code taken from http://forums.sun.com/thread.jspa?forumID=76&threadID=665487
 * @author aschulze
 */
public class Tools {

	private static char[] map1 = new char[64];

	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++] = '/';
	}

	public static String base64Encode(byte[] in) {
		int iLen = in.length;
		int oDataLen = (iLen * 4 + 2) / 3;// output length without padding
		int oLen = ((iLen + 2) / 3) * 4;// output length including padding
		char[] out = new char[oLen];
		int ip = 0;
		int op = 0;
		int i0;
		int i1;
		int i2;
		int o0;
		int o1;
		int o2;
		int o3;
		while (ip < iLen) {
			i0 = in[ip++] & 0xff;
			i1 = ip < iLen ? in[ip++] & 0xff : 0;
			i2 = ip < iLen ? in[ip++] & 0xff : 0;
			o0 = i0 >>> 2;
			o1 = ((i0 & 3) << 4) | (i1 >>> 4);
			o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
			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 new String(out);
	}

}