Cleanup of doc parsing code

examples/jsm/loaders/3DMLoader.js

@@ -156,9 +156,12 @@ Rhino3dmLoader.prototype = Object.assign( Object.create( Loader.prototype ), {
 
 	parse: function ( data, onLoad, onError ) {
 
-		if ( ! ( data instanceof ArrayBuffer ) ) {
+		// issue: https://github.com/mcneel/rhino3dm/issues/338
+		// issue: https://github.com/emscripten-core/emscripten/issues/13065
 
-			data = this._objToUint( data ).buffer;
+		if ( data instanceof Uint8Array ) {
+
+			data = new Uint8Array( data ).buffer;
 
 		}
 
@@ -168,23 +171,6 @@ Rhino3dmLoader.prototype = Object.assign( Object.create( Loader.prototype ), {
 
 	},
 
-	// from https://stackoverflow.com/questions/35971566/store-a-json-object-in-arraybuffer/35971686#35971686
-	_objToUint: function ( obj ) {
-
-		var string = btoa( unescape( JSON.stringify( obj ) ) ),
-			charList = string.split( '' ),
-			uintArray = [];
-
-		for ( var i = 0; i < charList.length; i ++ ) {
-
-			uintArray.push( charList[ i ].charCodeAt( 0 ) );
-
-		}
-
-		return new Uint8Array( uintArray );
-
-	},
-
 	_compareMaterials: function ( material ) {
 
 		var mat = {};
@@ -856,16 +842,6 @@ Rhino3dmLoader.Rhino3dmWorker = function () {
 
 	};
 
-	// from https://stackoverflow.com/questions/35971566/store-a-json-object-in-arraybuffer/35971686#35971686
-	function uintToObj( uintArray ) {
-
-		var encodedString = String.fromCharCode.apply( null, uintArray ),
-			decodedString = decodeURIComponent( escape( atob( encodedString ) ) );
-
-		return JSON.parse( decodedString );
-
-	}
-
 	function decodeObjects( rhino, buffer ) {
 
 		var arr = new Uint8Array( buffer );
@@ -880,15 +856,6 @@ Rhino3dmLoader.Rhino3dmWorker = function () {
 
 		//Handle objects
 
-		if ( doc === null ) {
-
-			doc = new rhino.File3dm();
-			var obj = uintToObj( arr );
-			var rObj = rhino.CommonObject.decode( obj );
-			doc.objects().add( rObj, null );
-
-		}
-
 		var objs = doc.objects();
 		var cnt = objs.count;