diff -r 000000000000 -r cfbd4eecb941 vm/src/main/java/org/apidesign/vm4brwsr/Zips.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/Zips.java	Fri Feb 01 18:42:07 2013 +0100
@@ -0,0 +1,97 @@
+/**
+ * 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.net.URL;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
+
+/** Conversion from classpath to load function.
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+final class Zips {
+    private Zips() {
+    }
+    
+    public static void init() {
+    }
+    
+    public static byte[] loadFromCp(Object[] classpath, String res) {
+        for (int i = 0; i < classpath.length; i++) {
+            Object c = classpath[i];
+            if (c instanceof String) {
+                try {
+                    c = classpath[i] = toZip((String)c);
+                } catch (IOException ex) {
+                    classpath[i] = ex;
+                }
+            }
+            if (c instanceof Zips) {
+                Object checkRes = ((Zips)c).findRes(res);
+                if (checkRes instanceof byte[]) {
+                    return (byte[])checkRes;
+                }
+            }
+        }
+        return null;
+    }
+
+    @JavaScriptBody(args = { "res" }, body = "var r = this[res]; return r ? r : null;")
+    private native byte[] findRes(String res);
+
+    @JavaScriptBody(args = { "res", "arr" }, body = "this[res] = arr;")
+    private native void putRes(String res, byte[] arr);
+    
+    private static Zips toZip(String path) throws IOException {
+        URL u = new URL(path);
+        ZipInputStream zip = new ZipInputStream(u.openStream());
+        Zips z = new Zips();
+        for (;;) {
+            ZipEntry entry = zip.getNextEntry();
+            if (entry == null) {
+                break;
+            }
+            byte[] arr = new byte[4096];
+            int offset = 0;
+            for (;;) {
+                int len = zip.read(arr, offset, arr.length - offset);
+                if (len == -1) {
+                    break;
+                }
+                offset += len;
+                if (offset == arr.length) {
+                    enlargeArray(arr, arr.length + 4096);
+                }
+            }
+            sliceArray(arr, offset);
+            z.putRes(entry.getName(), arr);
+        }
+        return z;
+    }
+
+    @JavaScriptBody(args = { "arr", "len" }, body = "while (arr.length < len) arr.push(0);")
+    private static native void enlargeArray(byte[] arr, int len);
+
+    @JavaScriptBody(args = { "arr", "len" }, body = "arr.splice(len, arr.length - len);")
+    private static native void sliceArray(byte[] arr, int len);
+    
+    
+}