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Apache Commons Compress software defines an API for working with
compression and archive formats. These include: bzip2, gzip, pack200,
lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4,
Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
/*
* 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.commons.compress.harmony.unpack200.bytecode;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.List;
/**
* An entry in an exception table.
*/
public class ExceptionTableEntry {
private final int startPC;
private final int endPC;
private final int handlerPC;
private final CPClass catchType;
private int startPcRenumbered;
private int endPcRenumbered;
private int handlerPcRenumbered;
private int catchTypeIndex;
/**
* Create a new ExceptionTableEntry. Exception tables are of two kinds: either a normal one (with a Throwable as the
* catch_type) or a finally clause (which has no catch_type). In the class file, the finally clause is represented
* as catch_type == 0.
*
* To create a finally clause with this method, pass in null for the catchType.
*
* @param startPC int
* @param endPC int
* @param handlerPC int
* @param catchType CPClass (if it's a normal catch) or null (if it's a finally clause).
*/
public ExceptionTableEntry(final int startPC, final int endPC, final int handlerPC, final CPClass catchType) {
this.startPC = startPC;
this.endPC = endPC;
this.handlerPC = handlerPC;
this.catchType = catchType;
}
public void write(final DataOutputStream dos) throws IOException {
dos.writeShort(startPcRenumbered);
dos.writeShort(endPcRenumbered);
dos.writeShort(handlerPcRenumbered);
dos.writeShort(catchTypeIndex);
}
public void renumber(final List byteCodeOffsets) {
startPcRenumbered = ((Integer) byteCodeOffsets.get(startPC)).intValue();
final int endPcIndex = startPC + endPC;
endPcRenumbered = ((Integer) byteCodeOffsets.get(endPcIndex)).intValue();
final int handlerPcIndex = endPcIndex + handlerPC;
handlerPcRenumbered = ((Integer) byteCodeOffsets.get(handlerPcIndex)).intValue();
}
public CPClass getCatchType() {
return catchType;
}
public void resolve(final ClassConstantPool pool) {
if (catchType == null) {
// If the catch type is a finally clause
// the index is always 0.
catchTypeIndex = 0;
return;
}
catchType.resolve(pool);
catchTypeIndex = pool.indexOf(catchType);
}
}