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