| 1 |
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| 2 | package com.adobe.utils {
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| 3 |
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| 4 | import flash.utils.Endian;
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| 5 |
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| 6 | /**
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| 7 | * Contains reusable methods for operations pertaining
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| 8 | * to int values.
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| 9 | */
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| 10 | public class IntUtil {
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| 11 |
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| 12 | /**
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| 13 | * Rotates x left n bits
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| 14 | *
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| 15 | * @langversion ActionScript 3.0
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| 16 | * @playerversion Flash 9.0
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| 17 | * @tiptext
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| 18 | */
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| 19 | public static function rol ( x:int, n:int ):int {
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| 20 | return ( x << n ) | ( x >>> ( 32 - n ) );
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| 21 | }
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| 22 |
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| 23 | /**
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| 24 | * Rotates x right n bits
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| 25 | *
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| 26 | * @langversion ActionScript 3.0
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| 27 | * @playerversion Flash 9.0
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| 28 | * @tiptext
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| 29 | */
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| 30 | public static function ror ( x:int, n:int ):uint {
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| 31 | var nn:int = 32 - n;
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| 32 | return ( x << nn ) | ( x >>> ( 32 - nn ) );
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| 33 | }
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| 34 |
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| 35 | /** String for quick lookup of a hex character based on index */
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| 36 | private static var hexChars:String = "0123456789abcdef";
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| 37 |
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| 38 | /**
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| 39 | * Outputs the hex value of a int, allowing the developer to specify
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| 40 | * the endinaness in the process. Hex output is lowercase.
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| 41 | *
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| 42 | * @param n The int value to output as hex
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| 43 | * @param bigEndian Flag to output the int as big or little endian
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| 44 | * @return A string of length 8 corresponding to the
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| 45 | * hex representation of n ( minus the leading "0x" )
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| 46 | * @langversion ActionScript 3.0
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| 47 | * @playerversion Flash 9.0
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| 48 | * @tiptext
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| 49 | */
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| 50 | public static function toHex( n:int, bigEndian:Boolean = false ):String {
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| 51 | var s:String = "";
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| 52 |
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| 53 | if ( bigEndian ) {
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| 54 | for ( var i:int = 0; i < 4; i++ ) {
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| 55 | s += hexChars.charAt( ( n >> ( ( 3 - i ) * 8 + 4 ) ) & 0xF )
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| 56 | + hexChars.charAt( ( n >> ( ( 3 - i ) * 8 ) ) & 0xF );
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| 57 | }
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| 58 | } else {
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| 59 | for ( var x:int = 0; x < 4; x++ ) {
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| 60 | s += hexChars.charAt( ( n >> ( x * 8 + 4 ) ) & 0xF )
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| 61 | + hexChars.charAt( ( n >> ( x * 8 ) ) & 0xF );
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| 62 | }
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| 63 | }
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| 64 |
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| 65 | return s;
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| 66 | }
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| 67 | }
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| 68 |
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| 69 | }
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