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/*
 * Copyright (c) 2007, 2020, 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;

/**
 *  

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. */ 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(); if (length < 0) { // we have an overflow as max_value(u4) > max_value(int) String attrName; try { attrName = getConstantPool().getUTF8Value(name_index); } catch (ConstantPool.InvalidIndex | ConstantPool.UnexpectedEntry e) { attrName = ""; } throw new FatalError(String.format("attribute %s too big to handle", attrName)); } 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(); } public float readFloat() throws IOException { return in.readFloat(); } public double readDouble() throws IOException { return in.readDouble(); } public String readUTF() throws IOException { return in.readUTF(); } private DataInputStream in; private ClassFile classFile; private Attribute.Factory attributeFactory; }





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