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colonymech / docs / www / colonyscout / internal / includes / uploadify / com / adobe / utils / IntUtil.as @ f59acf11

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/*
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  Copyright (c) 2008, Adobe Systems Incorporated
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  All rights reserved.
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  Redistribution and use in source and binary forms, with or without 
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  modification, are permitted provided that the following conditions are
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  met:
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  * Redistributions of source code must retain the above copyright notice, 
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    this list of conditions and the following disclaimer.
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  * Redistributions in binary form must reproduce the above copyright
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    notice, this list of conditions and the following disclaimer in the 
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    documentation and/or other materials provided with the distribution.
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  * Neither the name of Adobe Systems Incorporated nor the names of its 
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    contributors may be used to endorse or promote products derived from 
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    this software without specific prior written permission.
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  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
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  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.adobe.utils {
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	import flash.utils.Endian;
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	/**
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	 * Contains reusable methods for operations pertaining 
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	 * to int values.
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	 */
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	public class IntUtil {
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		/**
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		 * Rotates x left n bits
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		 *
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		 * @langversion ActionScript 3.0
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		 * @playerversion Flash 9.0
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		 * @tiptext
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		 */
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		public static function rol ( x:int, n:int ):int {
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			return ( x << n ) | ( x >>> ( 32 - n ) );
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		}
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		/**
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		 * Rotates x right n bits
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		 *
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		 * @langversion ActionScript 3.0
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		 * @playerversion Flash 9.0
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		 * @tiptext
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		 */
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		public static function ror ( x:int, n:int ):uint {
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			var nn:int = 32 - n;
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			return ( x << nn ) | ( x >>> ( 32 - nn ) );
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		}
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		/** String for quick lookup of a hex character based on index */
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		private static var hexChars:String = "0123456789abcdef";
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		/**
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		 * Outputs the hex value of a int, allowing the developer to specify
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		 * the endinaness in the process.  Hex output is lowercase.
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		 *
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		 * @param n The int value to output as hex
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		 * @param bigEndian Flag to output the int as big or little endian
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		 * @return A string of length 8 corresponding to the 
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		 *		hex representation of n ( minus the leading "0x" )
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		 * @langversion ActionScript 3.0
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		 * @playerversion Flash 9.0
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		 * @tiptext
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		 */
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		public static function toHex( n:int, bigEndian:Boolean = false ):String {
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			var s:String = "";
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			if ( bigEndian ) {
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				for ( var i:int = 0; i < 4; i++ ) {
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					s += hexChars.charAt( ( n >> ( ( 3 - i ) * 8 + 4 ) ) & 0xF ) 
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						+ hexChars.charAt( ( n >> ( ( 3 - i ) * 8 ) ) & 0xF );
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				}
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			} else {
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				for ( var x:int = 0; x < 4; x++ ) {
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					s += hexChars.charAt( ( n >> ( x * 8 + 4 ) ) & 0xF )
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						+ hexChars.charAt( ( n >> ( x * 8 ) ) & 0xF );
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				}
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			}
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			return s;
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		}
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	}
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}