root/as3/AVM2Loader/src/net/fladdict/display/AVM2Loader.as

/**
 * use as you like
 */
package net.fladdict.display
{
        import flash.display.Loader;
        import flash.events.*;
        import flash.net.*;
        import flash.system.LoaderContext;
        import flash.utils.ByteArray;
        import flash.utils.Endian;
        
        /**
         * Loads both of AVM1 and AVM2 swf as AVM2.
         */
        public class AVM2Loader extends Loader
        {
                private var _urlLoader:URLLoader;
                private var _context:LoaderContext;
                
                /**
                 * loads both of AVM1 and AVM2 movie as AVM2 movie.
                 */
                override public function load(request:URLRequest, context:LoaderContext=null):void
                {
                        _context = context;
                        
                        _urlLoader = new URLLoader();
                        _urlLoader.dataFormat = URLLoaderDataFormat.BINARY
                        _urlLoader.addEventListener(Event.COMPLETE, _binaryLoaded, false, 0, true);
                        _urlLoader.addEventListener(IOErrorEvent.IO_ERROR, _transferEvent, false, 0, true);
                        _urlLoader.addEventListener(ProgressEvent.PROGRESS, _transferEvent, false, 0, true);
                        _urlLoader.addEventListener(Event.OPEN, _transferEvent, false, 0, true);
                        _urlLoader.addEventListener(HTTPStatusEvent.HTTP_STATUS, _transferEvent, false, 0, true);
                        _urlLoader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, _transferEvent, false, 0, true);
                        _urlLoader.load(request);
                }
                
                private function _binaryLoaded(e:Event):void
                {
                        loadBytes(ByteArray(_urlLoader.data), _context);
                        _urlLoader = null
                }
                
                private function _transferEvent(e:Event):void
                {
                        dispatchEvent(e);
                }
                
                /**
                 * loads both of AVM1 and AVM2 movie as AVM2 movie.
                 */
                override public function loadBytes(bytes:ByteArray, context:LoaderContext=null):void
                {
                        //uncompress if compressed
                        bytes.endian = Endian.LITTLE_ENDIAN;
                        if(bytes[0]==0x43)
                        {
                                //many thanks for be-interactive.org
                                var compressedBytes:ByteArray = new ByteArray();
                                compressedBytes.writeBytes(bytes, 8);
                                compressedBytes.uncompress();
                                
                                bytes.length = 8;
                                bytes.position = 8;
                                bytes.writeBytes(compressedBytes);
                                compressedBytes.length = 0;
                                
                                //flag uncompressed
                                bytes[0] = 0x46;
                        }
                        
                        hackBytes(bytes);
                        super.loadBytes(bytes, context);
                }
                
                //if bytes are AVM1 movie, hack it!
                private function hackBytes(bytes:ByteArray):void
                {
                        if(bytes[4]<0x09)
                                bytes[4] = 0x09;  
                        
                        //dirty dirty
                        var imax:int = Math.min(bytes.length, 100);
                        for(var i:int=23; i<imax; i++)
                        {
                                if(bytes[i-2]==0x44 && bytes[i-1] == 0x11)
                                {
                                        bytes[i] = bytes[i] | 0x08;
                                        return
                                }
                        }
                }
        }
}