FormData in ActionScript

package {
import flash.net.URLRequest;
import flash.net.URLRequestMethod;
import flash.utils.ByteArray;

public class FormData {
 static private const CHARS:String = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

 static private function createRandom(length:int):String {
 var len:int, str:String;
 len = CHARS.length;
 str = '';
 while (str.length < length) {
 str += CHARS.charAt(Math.random() * len >> 0);
 }
 return str;
 }

 private var _data:Array;
 private var _boundary:String;

 public function FormData() {
 _data = [];
 _boundary = '----FlashFormDataBoundary' + createRandom(16);
 }

 public function append(name:String, value:*, filename:String = null, contentType:String = 'image/png'):void {
 _data.push({
 name : name,
 value : value,
 filename : filename,
 contentType: contentType
 });
 }

 public function apply(req:URLRequest):void {
 var bytes:ByteArray = new ByteArray();
 _bound(bytes);
 for (var i:int, len:int = _data.length, data:Object; i < len; i++) {
 data = _data[i];
 bytes.writeUTFBytes('Content-Disposition: form-data; name="' + data.name + '"');
 if (data.filename) {
 bytes.writeUTFBytes('; filename="' + data.filename + '"\r\n');
 bytes.writeUTFBytes('ContentType: ' + data.contentType);
 }
 bytes.writeUTFBytes('\r\n\r\n');
 if (data.value is ByteArray) {
 bytes.writeBytes(data.value);
 } else {
 bytes.writeUTFBytes(data.value);
 }
 bytes.writeUTFBytes('\r\n');
 _bound(bytes, i === len - 1);
 }

 req.method = URLRequestMethod.POST;
 req.data = bytes;
 req.contentType = 'multipart/form-data; boundary=' + _boundary;
 }

 private function _bound(bytes:ByteArray, end:Boolean = false):void {
 bytes.writeUTFBytes('--' + _boundary + (end ? '--' : '\r\n'));
 }
}
}

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