////////////////////////////////////////////////////////////////////////////////
//
//  Licensed to the Apache Software Foundation (ASF) under one or more
//  contributor license agreements.  See the NOTICE file distributed with
//  this work for additional information regarding copyright ownership.
//  The ASF licenses this file to You under the Apache License, Version 2.0
//  (the "License"); you may not use this file except in compliance with
//  the License.  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////
package UnitTest.Validation {

	import flash.utils.Endian;

	/**
	 * Contains reusable methods for operations pertaining
	 * to int values.
	 */
	public class IntUtil {

		/**
		 * Rotates x left n bits
		 *
		 * @langversion ActionScript 3.0
		 * @playerversion Flash 9.0
		 * @tiptext
		 */
		public static function rol ( x:int, n:int ):int {
			return ( x << n ) | ( x >>> ( 32 - n ) );
		}

		/**
		 * Rotates x right n bits
		 *
		 * @langversion ActionScript 3.0
		 * @playerversion Flash 9.0
		 * @tiptext
		 */
		public static function ror ( x:int, n:int ):uint {
			var nn:int = 32 - n;
			return ( x << nn ) | ( x >>> ( 32 - nn ) );
		}

		/** String for quick lookup of a hex character based on index */
		private static var hexChars:String = "0123456789abcdef";

		/**
		 * Outputs the hex value of a int, allowing the developer to specify
		 * the endinaness in the process.  Hex output is lowercase.
		 *
		 * @param n The int value to output as hex
		 * @param bigEndian Flag to output the int as big or little endian
		 * @return A string of length 8 corresponding to the
		 *		hex representation of n ( minus the leading "0x" )
		 * @langversion ActionScript 3.0
		 * @playerversion Flash 9.0
		 * @tiptext
		 */
		public static function toHex( n:int, bigEndian:Boolean = false ):String {
			var s:String = "";

			if ( bigEndian ) {
				for ( var i:int = 0; i < 4; i++ ) {
					s += hexChars.charAt( ( n >> ( ( 3 - i ) * 8 + 4 ) ) & 0xF )
						+ hexChars.charAt( ( n >> ( ( 3 - i ) * 8 ) ) & 0xF );
				}
			} else {
				for ( var x:int = 0; x < 4; x++ ) {
					s += hexChars.charAt( ( n >> ( x * 8 + 4 ) ) & 0xF )
						+ hexChars.charAt( ( n >> ( x * 8 ) ) & 0xF );
				}
			}

			return s;
		}
	}

}