jaroslav@644: /**
jaroslav@644:  * Back 2 Browser Bytecode Translator
jaroslav@644:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@644:  *
jaroslav@644:  * This program is free software: you can redistribute it and/or modify
jaroslav@644:  * it under the terms of the GNU General Public License as published by
jaroslav@644:  * the Free Software Foundation, version 2 of the License.
jaroslav@644:  *
jaroslav@644:  * This program is distributed in the hope that it will be useful,
jaroslav@644:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
jaroslav@644:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
jaroslav@644:  * GNU General Public License for more details.
jaroslav@644:  *
jaroslav@644:  * You should have received a copy of the GNU General Public License
jaroslav@644:  * along with this program. Look for COPYING file in the top folder.
jaroslav@644:  * If not, see http://opensource.org/licenses/GPL-2.0.
jaroslav@644:  */
jaroslav@644: package org.apidesign.vm4brwsr;
jaroslav@644: 
jaroslav@644: import java.io.IOException;
jaroslav@644: import java.net.URL;
jaroslav@644: import java.util.zip.ZipEntry;
jaroslav@644: import java.util.zip.ZipInputStream;
jaroslav@644: import org.apidesign.bck2brwsr.core.JavaScriptBody;
jaroslav@644: 
jaroslav@644: /** Conversion from classpath to load function.
jaroslav@644:  *
jaroslav@644:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jaroslav@644:  */
jaroslav@644: final class Zips {
jaroslav@644:     private Zips() {
jaroslav@644:     }
jaroslav@644:     
jaroslav@644:     public static void init() {
jaroslav@644:     }
jaroslav@644:     
jaroslav@644:     public static byte[] loadFromCp(Object[] classpath, String res) {
jaroslav@644:         for (int i = 0; i < classpath.length; i++) {
jaroslav@644:             Object c = classpath[i];
jaroslav@644:             if (c instanceof String) {
jaroslav@644:                 try {
jaroslav@644:                     c = classpath[i] = toZip((String)c);
jaroslav@644:                 } catch (IOException ex) {
jaroslav@644:                     classpath[i] = ex;
jaroslav@644:                 }
jaroslav@644:             }
jaroslav@644:             if (c instanceof Zips) {
jaroslav@644:                 Object checkRes = ((Zips)c).findRes(res);
jaroslav@644:                 if (checkRes instanceof byte[]) {
jaroslav@644:                     return (byte[])checkRes;
jaroslav@644:                 }
jaroslav@644:             }
jaroslav@644:         }
jaroslav@644:         return null;
jaroslav@644:     }
jaroslav@644: 
jaroslav@644:     @JavaScriptBody(args = { "res" }, body = "var r = this[res]; return r ? r : null;")
jaroslav@644:     private native byte[] findRes(String res);
jaroslav@644: 
jaroslav@644:     @JavaScriptBody(args = { "res", "arr" }, body = "this[res] = arr;")
jaroslav@644:     private native void putRes(String res, byte[] arr);
jaroslav@644:     
jaroslav@644:     private static Zips toZip(String path) throws IOException {
jaroslav@644:         URL u = new URL(path);
jaroslav@644:         ZipInputStream zip = new ZipInputStream(u.openStream());
jaroslav@644:         Zips z = new Zips();
jaroslav@644:         for (;;) {
jaroslav@644:             ZipEntry entry = zip.getNextEntry();
jaroslav@644:             if (entry == null) {
jaroslav@644:                 break;
jaroslav@644:             }
jaroslav@644:             byte[] arr = new byte[4096];
jaroslav@644:             int offset = 0;
jaroslav@644:             for (;;) {
jaroslav@644:                 int len = zip.read(arr, offset, arr.length - offset);
jaroslav@644:                 if (len == -1) {
jaroslav@644:                     break;
jaroslav@644:                 }
jaroslav@644:                 offset += len;
jaroslav@644:                 if (offset == arr.length) {
jaroslav@644:                     enlargeArray(arr, arr.length + 4096);
jaroslav@644:                 }
jaroslav@644:             }
jaroslav@644:             sliceArray(arr, offset);
jaroslav@644:             z.putRes(entry.getName(), arr);
jaroslav@644:         }
jaroslav@644:         return z;
jaroslav@644:     }
jaroslav@644: 
jaroslav@644:     @JavaScriptBody(args = { "arr", "len" }, body = "while (arr.length < len) arr.push(0);")
jaroslav@644:     private static native void enlargeArray(byte[] arr, int len);
jaroslav@644: 
jaroslav@644:     @JavaScriptBody(args = { "arr", "len" }, body = "arr.splice(len, arr.length - len);")
jaroslav@644:     private static native void sliceArray(byte[] arr, int len);
jaroslav@644:     
jaroslav@644:     
jaroslav@644: }