问AS3 -压缩ByteArray

EN

import flash.utils.ByteArray;
import flash.display.Loader;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.events.Event;
import mx.utils.Base64Decoder; //Transform String in a ByteArray.
import mx.utils.Base64Encoder; //Transform ByteArray in a readable string.
import mx.graphics.codec.PNGEncoder; //Encode a BitmapData in a PNG;

var myBMD:BitmapData=new myBitmapData(0,0); //In this case I had a BitmapData in the library so I took it from there.

var myBMDByteArray:ByteArray=(new PNGEncoder).encode(myBMD); //Create the ByteArray of myBMD usinf the PNGEncoder.

var compStr:String=compress(myBMDByteArray); //Creates String
trace(compStr);

// The loader acts exactly as we were loading an external PNG except the fact that we 
write the ByteArray.

var loader:Loader = new Loader();

loader.loadBytes(uncompress(compStr)); // In the loadBytes we write the Base64 String of the image.

loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadComplete);

function loadComplete(e:Event):void

{

    var bmp:BitmapData=new BitmapData(loader.width,loader.height,true,0x0);

    bmp.draw(loader);

    addChild(new Bitmap(bmp));

}


// Compress a ByteArray into a Base64 String.

function compress(bytes:ByteArray):String 

{

    var enc:Base64Encoder = new Base64Encoder();    
    enc.encodeBytes(bytes);
    return enc.drain().split("\n").join("");
}

// Uncompress a Base64 String into a ByteArray.

function uncompress(str:String):ByteArray 
{

    var dec:Base64Decoder = new Base64Decoder();

    dec.decode(str);

    var newByteArr:ByteArray=dec.toByteArray();        

    return newByteArr;
}