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Java client API for Franz AllegroGraph

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/******************************************************************************
 ** Copyright (c) 2008-2016 Franz Inc.
 ** All rights reserved. This program and the accompanying materials
 ** are made available under the terms of the Eclipse Public License v1.0
 ** which accompanies this distribution, and is available at
 ** http://www.eclipse.org/legal/epl-v10.html
 ******************************************************************************/

package com.franz.agraph.http.storedproc;

/**
 * 
 * @since v4.2
 * @deprecated The stored proc feature and API are experimental, and subject to change in a future release.
 */
public class AGDecoder {

	static byte charToCode[] = {
		 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 
		 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 
		 0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 62, 63,  0,  0,  0,  0, 
		52, 53, 54, 55, 56, 57, 58, 59, 60, 61,  0,  0,  0,  0,  0,  0, 
		 0,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 
		15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,  0,  0,  0,  0,  0, 
		 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 
		41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
	};
	
	public static byte[] decode(String sval){
		ByteArray retv = new ByteArray();
		int state = 0;
		byte rem = 0;
		
		for (int i = 0; i < sval.length(); i++) {
			char ch = sval.charAt(i);
			byte val = charToCode[ch];
			
			switch (state) {
			case 0:  rem = val;  break;
			
			case 1: retv.addbyte((byte) (rem | ((val & 0x3) << 6))); 
			        rem = (byte) (val >> 2);
			        break;
			
			case 2: retv.addbyte((byte) (rem | ((val & 0xf) << 4)));
			        rem = (byte) (val >> 4);
			        break;
			
			case 3: retv.addbyte((byte) (rem | (val << 2)));
			
			}
			
			if (++state > 3) state  = 0;
		}
		return retv.extract();
	}
		
}