99 lines
3.3 KiB
ActionScript
99 lines
3.3 KiB
ActionScript
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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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}
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