no commit message

2020-09-17 18:40:01 +08:00
parent 4382915d09
commit d957abceaa
283 changed files with 86935 additions and 63 deletions
@@ -0,0 +1,69 @@
+
+package com.adobe.utils {
+	
+	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;
+		}
+	}
+		
+}