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