[pull] dev from mrdoob:dev

examples/jsm/loaders/materialx/MaterialXArchive.js

@@ -0,0 +1,108 @@
+import { unzipSync } from '../../libs/fflate.module.js';
+
+const _textDecoder = new TextDecoder();
+
+function normalizePath( path ) {
+
+	return path
+		.split( '\\' ).join( '/' )
+		.replace( /^\.?\//, '' )
+		.replace( /^\/+/, '' );
+
+}
+
+function isZipBuffer( buffer ) {
+
+	const bytes = buffer instanceof Uint8Array ? buffer : new Uint8Array( buffer );
+	return bytes.length >= 4 && bytes[ 0 ] === 0x50 && bytes[ 1 ] === 0x4b;
+
+}
+
+function readMtlxArchive( buffer ) {
+
+	const bytes = buffer instanceof Uint8Array ? buffer : new Uint8Array( buffer );
+	const archive = unzipSync( bytes );
+
+	const fileMap = new Map();
+	let mtlxPath = null;
+
+	for ( const path in archive ) {
+
+		const normalizedPath = normalizePath( path );
+		fileMap.set( normalizedPath, archive[ path ] );
+
+		if ( normalizedPath.toLowerCase().endsWith( '.mtlx' ) ) {
+
+			if ( mtlxPath !== null ) {
+
+				throw new Error( 'THREE.MaterialXLoader: Invalid .mtlx.zip package. Exactly one .mtlx file is required.' );
+
+			}
+
+			mtlxPath = normalizedPath;
+
+		}
+
+	}
+
+	if ( mtlxPath === null ) {
+
+		throw new Error( 'THREE.MaterialXLoader: Invalid .mtlx.zip package. Missing .mtlx file.' );
+
+	}
+
+	const text = _textDecoder.decode( fileMap.get( mtlxPath ) );
+	return { text, mtlxPath, files: fileMap };
+
+}
+
+function createArchiveResolver( files ) {
+
+	const objectUrlCache = new Map();
+
+	const getFile = ( uri ) => {
+
+		const normalized = normalizePath( decodeURI( uri ) );
+		if ( files.has( normalized ) ) return files.get( normalized );
+
+		for ( const [ path, bytes ] of files ) {
+
+			if ( path.endsWith( normalized ) ) return bytes;
+
+		}
+
+		return null;
+
+	};
+
+	const resolve = ( uri ) => {
+
+		if ( objectUrlCache.has( uri ) ) return objectUrlCache.get( uri );
+
+		const bytes = getFile( uri );
+		if ( ! bytes ) return null;
+
+		const blob = new Blob( [ bytes ], { type: 'application/octet-stream' } );
+		const objectUrl = URL.createObjectURL( blob );
+		objectUrlCache.set( uri, objectUrl );
+		return objectUrl;
+
+	};
+
+	const dispose = () => {
+
+		for ( const objectUrl of objectUrlCache.values() ) {
+
+			URL.revokeObjectURL( objectUrl );
+
+		}
+
+		objectUrlCache.clear();
+
+	};
+
+	return { resolve, dispose };
+
+}
+
+export { isZipBuffer, readMtlxArchive, createArchiveResolver };