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A simple Java API client to connect to HP ALM using REST service

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package com.github.matheusesoft.alm.api.utils;

public class Base64Encoder {

	private final static char[] ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
			.toCharArray();

	private static int[] toInt = new int[128];

	static {
		for (int i = 0; i < ALPHABET.length; i++) {
			toInt[ALPHABET[i]] = i;
		}
	}

	public static String encode(byte[] buf) {
		int size = buf.length;
		char[] ar = new char[((size + 2) / 3) * 4];
		int a = 0;
		int i = 0;
		while (i < size) {
			byte b0 = buf[i++];
			byte b1 = (i < size) ? buf[i++] : 0;
			byte b2 = (i < size) ? buf[i++] : 0;

			int mask = 0x3F;
			ar[a++] = ALPHABET[(b0 >> 2) & mask];
			ar[a++] = ALPHABET[((b0 << 4) | ((b1 & 0xFF) >> 4)) & mask];
			ar[a++] = ALPHABET[((b1 << 2) | ((b2 & 0xFF) >> 6)) & mask];
			ar[a++] = ALPHABET[b2 & mask];
		}
		switch (size % 3) {
		case 1:
			ar[--a] = '=';
		case 2:
			ar[--a] = '=';
		}
		return new String(ar);
	}
}