/* Copyright (C) 2004-2007 Sami Koivu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.sf.rej.java;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import net.sf.rej.java.attribute.Attributes;
import net.sf.rej.java.constantpool.ConstantPool;
import net.sf.rej.java.constantpool.ConstantPoolInfo;
import net.sf.rej.util.ByteArrayByteParser;
import net.sf.rej.util.ByteParser;
import net.sf.rej.util.StreamByteParser;
public class Disassembler {
// TODO: Quick parse of methods/fields (without parsing the instructions)
public static String parseName(InputStream in) {
ByteParser parser = new StreamByteParser(in);
parser.setBigEndian(true);
ClassFile cf = parseBasics(parser);
return cf.getFullClassName();
}
public static ClassFile parseBasics(ByteParser parser) {
ClassFile cf = new ClassFile();
// cafebabe :)
cf.validateMagic(parser.getBytes(4));
cf.setMinorVersion(parser.getShortAsInt());
cf.setMajorVersion(parser.getShortAsInt());
int contantPoolCount = parser.getShortAsInt();
ConstantPool pool = new ConstantPool();
pool.init(contantPoolCount);
cf.setPool(pool);
for (int i = 1; i < contantPoolCount; i++) {
ConstantPoolInfo cpi = ConstantPoolInfo.getCPI(parser, pool);
pool.set(i, cpi);
// 8byte types take up two indices
if (cpi.getType() == ConstantPoolInfo.LONG
|| cpi.getType() == ConstantPoolInfo.DOUBLE)
i++;
}
cf.setAccessFlags(parser.getShortAsInt());
cf.setThisClass(parser.getShortAsInt());
cf.setSuperClass(parser.getShortAsInt());
return cf;
}
public static ClassFile readClass(byte[] data) {
// TODO: parse from stream
ByteParser parser = new ByteArrayByteParser(data);
parser.setBigEndian(true);
ClassFile cf = parseBasics(parser);
int interfaceCount = parser.getShortAsInt();
List<Interface> interfaces = new ArrayList<Interface>(interfaceCount);
for (int i = 0; i < interfaceCount; i++) {
interfaces.add(new Interface(parser.getShortAsInt(), cf.getPool()));
}
cf.setInterfaces(interfaces);
int fieldsCount = parser.getShortAsInt();
List<Field> fields = new ArrayList<Field>(fieldsCount);
for (int i = 0; i < fieldsCount; i++) {
Field f = new Field(parser, cf.getPool());
fields.add(f);
}
cf.setFields(fields);
int methodCount = parser.getShortAsInt();
List<Method> methods = new ArrayList<Method>(methodCount);
for (int i = 0; i < methodCount; i++) {
Method method = new Method(parser, cf.getPool());
methods.add(method);
}
cf.setMethods(methods);
cf.setAttributes(new Attributes(parser, cf.getPool()));
return cf;
}
}