/*
* Copyright (c) 2007, 2008, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.classfile;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Objects;
/**
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public class ClassReader {
ClassReader(ClassFile classFile, InputStream in, Attribute.Factory attributeFactory) throws IOException {
this.classFile = Objects.requireNonNull(classFile);
this.attributeFactory = Objects.requireNonNull(attributeFactory);
this.in = new DataInputStream(new BufferedInputStream(in));
}
ClassFile getClassFile() {
return classFile;
}
ConstantPool getConstantPool() {
return classFile.constant_pool;
}
public Attribute readAttribute() throws IOException {
int name_index = readUnsignedShort();
int length = readInt();
byte[] data = new byte[length];
readFully(data);
DataInputStream prev = in;
in = new DataInputStream(new ByteArrayInputStream(data));
try {
return attributeFactory.createAttribute(this, name_index, data);
} finally {
in = prev;
}
}
public void readFully(byte[] b) throws IOException {
in.readFully(b);
}
public int readUnsignedByte() throws IOException {
return in.readUnsignedByte();
}
public int readUnsignedShort() throws IOException {
return in.readUnsignedShort();
}
public int readInt() throws IOException {
return in.readInt();
}
public long readLong() throws IOException {
return in.readLong();
}
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