diff -r 350f8aee0f60 -r cb9e273dfd51 rt/vm/src/main/java/org/apidesign/vm4brwsr/ZipHandler.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/ZipHandler.java	Wed May 07 17:24:29 2014 +0200
@@ -0,0 +1,113 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.vm4brwsr;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
+import org.apidesign.bck2brwsr.emul.zip.FastJar;
+
+/** Conversion from classpath to load function.
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+final class ZipHandler {
+    private final FastJar fj;
+
+    private ZipHandler(String path, byte[] zipData) throws IOException {
+        long bef = timeNow();
+        fj = new FastJar(zipData);
+        for (FastJar.Entry e : fj.list()) {
+            putRes(e.name, e);
+        }
+        log("Iterating thru " + path + " took " + (timeNow() - bef) + "ms");
+    }
+    
+    public static void init() {
+    }
+    @JavaScriptBody(args = { "arr" }, body = "return arr.length;")
+    private static native int length(Object arr);
+    @JavaScriptBody(args = { "arr", "index", "value" }, body = "arr[index] = value; return value;")
+    private static native Object set(Object arr, int index, Object value);
+    
+    @JavaScriptBody(args = { "msg" }, body = "if (typeof console !== 'undefined') console.log(msg.toString());")
+    private static native void log(String msg);
+
+    byte[] findRes(String res) throws IOException {
+        Object arr = findResImpl(res);
+        if (arr instanceof FastJar.Entry) {
+            long bef = timeNow();
+            InputStream zip = fj.getInputStream((FastJar.Entry)arr);
+            arr = readFully(new byte[512], zip);
+            putRes(res, arr);
+            log("Reading " + res + " took " + (timeNow() - bef) + "ms");
+        }
+        return (byte[]) arr;
+    }
+
+    @JavaScriptBody(args = { "res" }, body = "var r = this[res]; return r ? r : null;")
+    private native Object findResImpl(String res);
+
+    @JavaScriptBody(args = { "res", "arr" }, body = "this[res] = arr;")
+    private native void putRes(String res, Object arr);
+    
+    static ZipHandler toZip(String path) throws IOException {
+        URL u = new URL(path);
+        byte[] zipData = (byte[]) u.getContent(new Class[] { byte[].class });
+        return new ZipHandler(path, zipData);
+    }
+
+    @JavaScriptBody(args = { "arr", "len" }, body = "while (arr.length < len) arr.push(0);")
+    private static native void enlargeBytes(byte[] arr, int len);
+
+    @JavaScriptBody(args = { "arr", "len" }, body = "arr.splice(len, arr.length - len);")
+    private static native void sliceArray(byte[] arr, int len);
+
+    private static Object readFully(byte[] arr, InputStream zip) throws IOException {
+        int offset = 0;
+        for (;;) {
+            int len = zip.read(arr, offset, arr.length - offset);
+            if (len == -1) {
+                break;
+            }
+            offset += len;
+            if (offset == arr.length) {
+                enlargeBytes(arr, arr.length + 4096);
+            }
+        }
+        sliceArray(arr, offset);
+        return arr;
+    }
+
+    private static long timeNow() {
+        double time = m();
+        if (time >= 0) {
+            return (long)time;
+        }
+        return org.apidesign.bck2brwsr.emul.lang.System.currentTimeMillis();
+    }
+    @JavaScriptBody(args = {}, body = 
+        "if (typeof window.performance === 'undefined') return -1;\n"
+      + "if (typeof window.performance.now === 'undefined') return -1;\n"
+      + "return window.performance.now();"
+    )
+    private static native double m();
+    
+    
+}