87 lines
2.9 KiB
Java
87 lines
2.9 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.tomcat.util.bcel.classfile;
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import java.io.DataInput;
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import java.io.EOFException;
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import java.io.IOException;
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import org.apache.tomcat.util.bcel.Const;
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/**
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* Utility functions that do not really belong to any class in particular.
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*/
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final class Utility {
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private Utility() {
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// Hide default constructor
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}
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/**
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* Shorten long class name <em>str</em>, i.e., chop off the <em>prefix</em>,
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* if the
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* class name starts with this string and the flag <em>chopit</em> is true.
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* Slashes <em>/</em> are converted to dots <em>.</em>.
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*
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* @param str The long class name
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* @return Compacted class name
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*/
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static String compactClassName(final String str) {
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return str.replace('/', '.'); // Is `/' on all systems, even DOS
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}
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static String getClassName(final ConstantPool constant_pool, final int index) {
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Constant c = constant_pool.getConstant(index, Const.CONSTANT_Class);
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int i = ((ConstantClass) c).getNameIndex();
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// Finally get the string from the constant pool
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c = constant_pool.getConstant(i, Const.CONSTANT_Utf8);
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String name = ((ConstantUtf8) c).getBytes();
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return compactClassName(name);
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}
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static void skipFully(final DataInput file, final int length) throws IOException {
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int total = file.skipBytes(length);
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if (total != length) {
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throw new EOFException();
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}
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}
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static void swallowFieldOrMethod(final DataInput file)
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throws IOException {
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// file.readUnsignedShort(); // Unused access flags
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// file.readUnsignedShort(); // name index
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// file.readUnsignedShort(); // signature index
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skipFully(file, 6);
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int attributes_count = file.readUnsignedShort();
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for (int i = 0; i < attributes_count; i++) {
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swallowAttribute(file);
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}
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}
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static void swallowAttribute(final DataInput file)
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throws IOException {
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//file.readUnsignedShort(); // Unused name index
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skipFully(file, 2);
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// Length of data in bytes
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int length = file.readInt();
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skipFully(file, length);
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}
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}
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