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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.pack200;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Label;
/**
* NewAttribute extends {@code Attribute} and manages unknown attributes encountered by ASM that have had a layout
* definition given to pack200 (e.g. via one of the -C, -M, -F or -D command line options)
*/
public class NewAttribute extends Attribute {
/**
* ErrorAttribute extends {@code NewAttribute} and manages attributes encountered by ASM that have had an error
* action specified to pack200 (e.g. via one of the -C, -M, -F or -D command line options such as
* -Cattribute-name=error)
*/
public static class ErrorAttribute extends NewAttribute {
public ErrorAttribute(final String type, final int context) {
super(type, "", context);
}
@Override
protected Attribute read(final ClassReader cr, final int off, final int len, final char[] buf,
final int codeOff, final Label[] labels) {
throw new Error("Attribute " + type + " was found");
}
}
/**
* PassAttribute extends {@code NewAttribute} and manages attributes encountered by ASM that have had an pass
* action specified to pack200 (e.g. via one of the -C, -M, -F or -D command line options such as
* -Cattribute-name=pass)
*/
public static class PassAttribute extends NewAttribute {
public PassAttribute(final String type, final int context) {
super(type, "", context);
}
@Override
protected Attribute read(final ClassReader cr, final int off, final int len, final char[] buf,
final int codeOff, final Label[] labels) {
throw new Segment.PassException();
}
}
/**
* StripAttribute extends {@code NewAttribute} and manages attributes encountered by ASM that have had an strip
* action specified to pack200 (e.g. via one of the -C, -M, -F or -D command line options such as
* -Cattribute-name=strip)
*/
public static class StripAttribute extends NewAttribute {
public StripAttribute(final String type, final int context) {
super(type, "", context);
}
@Override
protected Attribute read(final ClassReader cr, final int off, final int len, final char[] buf,
final int codeOff, final Label[] labels) {
// TODO Not sure if this works, can we really strip an attribute if we don't know the layout?
return null;
}
}
private boolean contextClass = false;
private boolean contextMethod = false;
private boolean contextField = false;
private boolean contextCode = false;
private final String layout;
private byte[] contents;
private int codeOff;
private Label[] labels;
private ClassReader classReader;
private char[] buf;
public NewAttribute(final ClassReader classReader, final String type, final String layout, final byte[] contents,
final char[] buf, final int codeOff, final Label[] labels) {
super(type);
this.classReader = classReader;
this.contents = contents;
this.layout = layout;
this.codeOff = codeOff;
this.labels = labels;
this.buf = buf;
}
public NewAttribute(final String type, final String layout, final int context) {
super(type);
this.layout = layout;
addContext(context);
}
public void addContext(final int context) {
switch (context) {
case AttributeDefinitionBands.CONTEXT_CLASS:
contextClass = true;
break;
case AttributeDefinitionBands.CONTEXT_METHOD:
contextMethod = true;
break;
case AttributeDefinitionBands.CONTEXT_FIELD:
contextField = true;
break;
case AttributeDefinitionBands.CONTEXT_CODE:
contextCode = true;
break;
}
}
public byte[] getBytes() {
return contents;
}
public Label getLabel(final int index) {
return labels[index];
}
public String getLayout() {
return layout;
}
@Override
public boolean isCodeAttribute() {
return codeOff != -1;
}
public boolean isContextClass() {
return contextClass;
}
public boolean isContextCode() {
return contextCode;
}
public boolean isContextField() {
return contextField;
}
public boolean isContextMethod() {
return contextMethod;
}
@Override
public boolean isUnknown() {
return false;
}
public boolean isUnknown(final int context) {
switch (context) {
case AttributeDefinitionBands.CONTEXT_CLASS:
return !contextClass;
case AttributeDefinitionBands.CONTEXT_METHOD:
return !contextMethod;
case AttributeDefinitionBands.CONTEXT_FIELD:
return !contextField;
case AttributeDefinitionBands.CONTEXT_CODE:
return !contextCode;
}
return false;
}
@Override
protected Attribute read(final ClassReader cr, final int off, final int len, final char[] buf, final int codeOff,
final Label[] labels) {
final byte[] attributeContents = new byte[len];
System.arraycopy(cr.b, off, attributeContents, 0, len);
return new NewAttribute(cr, type, layout, attributeContents, buf, codeOff, labels);
}
public String readClass(final int index) {
return classReader.readClass(index, buf);
}
public Object readConst(final int index) {
return classReader.readConst(index, buf);
}
public String readUTF8(final int index) {
return classReader.readUTF8(index, buf);
}
}