我有一个使用ActionScript函数编码为base64的图像：
private static const BASE64_CHARS:String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
public static function encodeByteArray(_arg1:ByteArray):String {
var _local3:Array;
var _local5:uint;
var _local6:uint;
var _local7:uint;
var _local2 = "";
var _local4:Array = new Array(4);
_arg1.position = 0;
while (_arg1.bytesAvailable > 0) {
_local3 = new Array();
_local5 = 0;
while ((((_local5 < 3)) && ((_arg1.bytesAvailable > 0)))) {
_local3[_local5] = _arg1.readUnsignedByte();
_local5++;
};
_local4[0] = ((_local3[0] & 252) >> 2);
_local4[1] = (((_local3[0] & 3) << 4) | (_local3[1] >> 4));
_local4[2] = (((_local3[1] & 15) << 2) | (_local3[2] >> 6));
_local4[3] = (_local3[2] & 63);
_local6 = _local3.length;
while (_local6 < 3) {
_local4[(_local6 + 1)] = 64;
_local6++;
};
_local7 = 0;
while (_local7 < _local4.length) {
_local2 = (_local2 + BASE64_CHARS.charAt(_local4[_local7]));
_local7++;
};
};
return (_local2);
}
我现在正在尝试用JS / PHP解码字符串，但是没有成功，并且将图片恢复。这是Actionscript解码函数：
public static function decodeToByteArray(_arg1:String):ByteArray{
var _local6:uint;
var _local7:uint;
var _local2:ByteArray = new ByteArray();
var _local3:Array = new Array(4);
var _local4:Array = new Array(3);
var _local5:uint;
while (_local5 < _arg1.length) {
_local6 = 0;
while ((((_local6 < 4)) && (((_local5 + _local6) < _arg1.length)))) {
_local3[_local6] = BASE64_CHARS.indexOf(_arg1.charAt((_local5 + _local6)));
_local6++;
};
_local4[0] = ((_local3[0] << 2) + ((_local3[1] & 48) >> 4));
_local4[1] = (((_local3[1] & 15) << 4) + ((_local3[2] & 60) >> 2));
_local4[2] = (((_local3[2] & 3) << 6) + _local3[3]);
_local7 = 0;
while (_local7 < _local4.length) {
if (_local3[(_local7 + 1)] == 64){
break;
};
_local2.writeByte(_local4[_local7]);
_local7++;
};
_local5 = (_local5 + 4);
};
_local2.position = 0;
return (_local2);
}
我尝试将解码ActionScript函数转换为JS，但我缺少new ByteArray();。我不知道如何处理它。
我需要一种方法将编码的图像字符串解码回图像。
这里是一个用“encodeByteArray”函数编码的图像的样本base64字符串：
感谢您的帮助。