1 /**

     2  * Hex

     3  * 

     4  * Utility class to convert Hex strings to ByteArray or String types.

     5  * Copyright (c) 2007 Henri Torgemane

     6  * 

     7  * See LICENSE.txt for full license information.

     8  */

     9 package com.hurlant.util

    10 {

    11 	import flash.utils.ByteArray;

    12 	

    13 	public class Hex

    14 	{

    15 		/**

    16 		 * Support straight hex, or colon-laced hex.

    17 		 * (that means 23:03:0e:f0, but *NOT* 23:3:e:f0)

    18 		 * Whitespace characters are ignored.

    19 		 */

    20 		public static function toArray(hex:String):ByteArray {

    21 			hex = hex.replace(/\s|:/gm,'');

    22 			var a:ByteArray = new ByteArray;

    23 			if (hex.length&1==1) hex="0"+hex;

    24 			for (var i:uint=0;i<hex.length;i+=2) {

    25 				a[i/2] = parseInt(hex.substr(i,2),16);

    26 			}

    27 			return a;

    28 		}

    29 		

    30 		public static function fromArray(array:ByteArray, colons:Boolean=false):String {

    31 			var s:String = "";

    32 			for (var i:uint=0;i<array.length;i++) {

    33 				s+=("0"+array[i].toString(16)).substr(-2,2);

    34 				if (colons) {

    35 					if (i<array.length-1) s+=":";

    36 				}

    37 			}

    38 			return s;

    39 		}

    40 		

    41 		/**

    42 		 * 

    43 		 * @param hex

    44 		 * @return a UTF-8 string decoded from hex

    45 		 * 

    46 		 */

    47 		public static function toString(hex:String):String {

    48 			var a:ByteArray = toArray(hex);

    49 			return a.readUTFBytes(a.length);

    50 		}

    51 		

    52 		

    53 		/**

    54 		 * 

    55 		 * @param str

    56 		 * @return a hex string encoded from the UTF-8 string str

    57 		 * 

    58 		 */

    59 		public static function fromString(str:String, colons:Boolean=false):String {

    60 			var a:ByteArray = new ByteArray;

    61 			a.writeUTFBytes(str);

    62 			return fromArray(a, colons);

    63 		}

    64 		

    65 	}

    66 }