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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.jack.launcher;
import com.android.jack.launcher.util.BytesStreamSucker;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.util.Enumeration;
import java.util.Vector;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
class ZipLoader extends ClassLoader {
private static final char BANG = '!';
static {
// ensure class is loaded early, don't wait for first usage
ZipURLConnection.class.getName();
}
private static class ZipURLConnection extends URLConnection {
@Nonnull
private final ZipFile zip;
@Nonnull
private final ZipEntry entry;
ZipURLConnection(@Nonnull URL url, @Nonnull ZipFile zip, @Nonnull ZipEntry entry) {
super(url);
this.zip = zip;
this.entry = entry;
}
@Override
public void connect() {
// nothing to do
}
@Override
@Nonnull
public InputStream getInputStream() throws IOException {
return zip.getInputStream(entry);
}
}
private static class ZipURLStreamHandler extends URLStreamHandler {
@Nonnull
private final ZipFile zip;
ZipURLStreamHandler(@Nonnull ZipFile zip) {
this.zip = zip;
}
@Override
protected URLConnection openConnection(@Nonnull URL url) throws IOException {
ZipEntry entry = zip.getEntry(getZipEntry(url));
if (entry == null) {
throw new FileNotFoundException(url.toString());
}
return new ZipURLConnection(url, zip, entry);
}
}
@Nonnull
private static URL makeURL(@Nonnull ZipEntry entry, @Nonnull ZipURLStreamHandler handler) {
try {
assert entry.getName().indexOf(BANG) == -1;
return new URL("launcherzip", "", -1, handler.zip.getName() + BANG + entry.getName(),
handler);
} catch (MalformedURLException e) {
throw new AssertionError();
}
}
@Nonnull
private static String getZipEntry(@Nonnull URL url) {
String file = url.getFile();
int dashIndex = file.lastIndexOf(BANG);
return file.substring(dashIndex + 1);
}
@Nonnull
private final ZipURLStreamHandler[] handlers;
public ZipLoader(@Nonnull ZipFile[] entries) {
handlers = new ZipURLStreamHandler[entries.length];
for (int i = 0; i < entries.length; i++) {
handlers[i] = new ZipURLStreamHandler(entries[i]);
}
}
@Nonnull
@Override
protected Class<?> findClass(@Nonnull String name) throws ClassNotFoundException {
ZipEntry foundEntry = null;
ZipFile foundZip = null;
for (ZipURLStreamHandler handler : handlers) {
ZipFile zip = handler.zip;
foundEntry = zip.getEntry(name.replace('.', '/') + ".class");
if (foundEntry != null) {
foundZip = zip;
break;
}
}
if (foundEntry == null) {
throw new ClassNotFoundException(name);
}
InputStream in = null;
try {
// FINDBUGS
assert foundZip != null;
in = foundZip.getInputStream(foundEntry);
long size = foundEntry.getSize();
assert size >= -1 && size <= Integer.MAX_VALUE;
byte[] classData;
if (size == -1) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
new BytesStreamSucker(in, out, /* toBeClose = */ true).suck();
classData = out.toByteArray();
} else {
classData = new byte[(int) size];
// FINDBUGS
in = new DataInputStream(in);
((DataInputStream) in).readFully(classData);
}
return defineClass(name, classData, 0, classData.length);
} catch (IOException e) {
throw new ClassNotFoundException(name);
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
// ignore
}
}
}
}
@CheckForNull
@Override
public InputStream getResourceAsStream(@Nonnull String name) {
InputStream found = getParent().getResourceAsStream(name);
if (found != null) {
return found;
} else {
for (ZipURLStreamHandler handler : handlers) {
ZipFile zip = handler.zip;
ZipEntry foundEntry = zip.getEntry(name);
if (foundEntry != null) {
try {
return zip.getInputStream(foundEntry);
} catch (IOException e) {
AssertionError error = new AssertionError();
error.initCause(e);
throw error;
}
}
}
return null;
}
}
@CheckForNull
@Override
protected URL findResource(@Nonnull String name) {
for (ZipURLStreamHandler handler : handlers) {
ZipFile zip = handler.zip;
ZipEntry foundEntry = zip.getEntry(name);
if (foundEntry != null) {
return makeURL(foundEntry, handler);
}
}
return null;
}
@Nonnull
@Override
protected Enumeration<URL> findResources(@Nonnull String name) {
Vector<URL> vector = new Vector<URL>();
for (ZipURLStreamHandler handler : handlers) {
ZipFile zip = handler.zip;
ZipEntry foundEntry = zip.getEntry(name);
if (foundEntry != null) {
vector.add(makeURL(foundEntry, handler));
}
}
return vector.elements();
}
}
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