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/*******************************************************************************
* Copyright (c) 2015 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Lesser General Public
* License v3.0 which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/lgpl.html
* <p>
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.analysis;
import com.google.common.collect.Lists;
import cuchaz.enigma.Constants;
import cuchaz.enigma.mapping.ClassEntry;
import javassist.ByteArrayClassPath;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.NotFoundException;
import javassist.bytecode.Descriptor;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
public class JarClassIterator implements Iterator<CtClass> {
private JarFile jar;
private Iterator<JarEntry> iter;
public JarClassIterator(JarFile jar) {
this.jar = jar;
// get the jar entries that correspond to classes
List<JarEntry> classEntries = Lists.newArrayList();
Enumeration<JarEntry> entries = this.jar.entries();
while (entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
// is this a class file?
if (entry.getName().endsWith(".class")) {
classEntries.add(entry);
}
}
this.iter = classEntries.iterator();
}
public static List<ClassEntry> getClassEntries(JarFile jar) {
List<ClassEntry> classEntries = Lists.newArrayList();
Enumeration<JarEntry> entries = jar.entries();
while (entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
// is this a class file?
if (!entry.isDirectory() && entry.getName().endsWith(".class")) {
classEntries.add(getClassEntry(entry));
}
}
return classEntries;
}
public static Iterable<CtClass> classes(final JarFile jar) {
return () -> new JarClassIterator(jar);
}
private static CtClass getClass(JarFile jar, JarEntry entry) throws IOException, NotFoundException {
// read the class into a buffer
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buf = new byte[Constants.KiB];
int totalNumBytesRead = 0;
InputStream in = jar.getInputStream(entry);
while (in.available() > 0) {
int numBytesRead = in.read(buf);
if (numBytesRead < 0) {
break;
}
bos.write(buf, 0, numBytesRead);
// sanity checking
totalNumBytesRead += numBytesRead;
if (totalNumBytesRead > Constants.MiB) {
throw new Error("Class file " + entry.getName() + " larger than 1 MiB! Something is wrong!");
}
}
// get a javassist handle for the class
String className = Descriptor.toJavaName(getClassEntry(entry).getName());
ClassPool classPool = new ClassPool();
classPool.appendSystemPath();
classPool.insertClassPath(new ByteArrayClassPath(className, bos.toByteArray()));
return classPool.get(className);
}
private static ClassEntry getClassEntry(JarEntry entry) {
return new ClassEntry(entry.getName().substring(0, entry.getName().length() - ".class".length()));
}
@Override
public boolean hasNext() {
return this.iter.hasNext();
}
@Override
public CtClass next() {
JarEntry entry = this.iter.next();
try {
return getClass(this.jar, entry);
} catch (IOException | NotFoundException ex) {
throw new Error("Unable to load class: " + entry.getName());
}
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
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