actionscript 3.0 cookbook：Int64与Number转换

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package com.netease.protobuf {
public final class Int64 extends Binary64 {
public final function set high(value:int):void {
internalHigh = value
}
public final function get high():int {
return internalHigh
}
public function Int64(low:uint = 0, high:int = 0) {
super(low, high)
}
/**
* Convert from <code>Number</code>.
*/
public static function fromNumber(n: Number):Int64 {
return new Int64(n, Math.floor(n / 4294967296.0))
}
/**
* Convert to <code>Number</code>.
*/
public final function toNumber():Number {
return high * 4294967296.0 + low
}
public final function toString(radix:uint = 10):String {
if (radix < 2 || radix > 36) {
throw new ArgumentError
}
switch (high) {
case 0:
{
return low.toString(radix)
}

case -1:
{
if ((low & 0x80000000) == 0)
{
return (int(low | 0x80000000) - 2147483648.0).toString(radix)
}
else
{
return int(low).toString(radix)
}
}

default:
{
break;
}
}
if (low == 0 && high == 0) {
return "0"
}
const digitChars:Array = [];
const copyOfThis:UInt64 = new UInt64(low, high);
if (high < 0) {
copyOfThis.bitwiseNot()
copyOfThis.add(1)
}
do {
const digit:uint = copyOfThis.div(radix);
if (digit < 10) {
digitChars.push(digit + CHAR_CODE_0);
} else {
digitChars.push(digit - 10 + CHAR_CODE_A);
}
} while (copyOfThis.high != 0)
if (high < 0) {
return '-' + copyOfThis.low.toString(radix) +
String.fromCharCode.apply(
String, digitChars.reverse())
} else {
return copyOfThis.low.toString(radix) +
String.fromCharCode.apply(
String, digitChars.reverse())
}
}
public static function parseInt64(str:String, radix:uint = 0):Int64 {
const negative:Boolean = str.search(/^\-/) == 0
var i:uint = negative ? 1 : 0
if (radix == 0) {
if (str.search(/^\-?0x/) == 0) {
radix = 16
i += 2
} else {
radix = 10
}
}
if (radix < 2 || radix > 36) {
throw new ArgumentError
}
str = str.toLowerCase()
const result:Int64 = new Int64
for (; i < str.length; i++) {
var digit:uint = str.charCodeAt(i)
if (digit >= CHAR_CODE_0 && digit <= CHAR_CODE_9) {
digit -= CHAR_CODE_0
} else if (digit >= CHAR_CODE_A && digit <= CHAR_CODE_Z) {
digit -= CHAR_CODE_A
digit += 10
} else {
throw new ArgumentError
}
if (digit >= radix) {
throw new ArgumentError
}
result.mul(radix)
result.add(digit)
}
if (negative) {
result.bitwiseNot()
result.add(1)
}
return result
}
}

}

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