de.schlichtherle.util.zip.DefaultExtraField Maven / Gradle / Ivy
/*
* Copyright (C) 2007-2010 Schlichtherle IT Services
*
* Licensed 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 de.schlichtherle.util.zip;
/**
* Default implementation for an Extra Field in a Local or Central Header of a
* ZIP archive.
*
* This class is not thread-safe.
*
* @author Christian Schlichtherle
* @version $Id$
* @since TrueZIP 6.7
*/
final class DefaultExtraField extends ExtraField {
private final int headerID;
private byte[] data;
/**
* Creates a new instance of the default Extra Field implementation.
*
* @param headerID An unsigned short integer (two bytes) indicating the
* type of the Extra Field.
* @throws IllegalArgumentException If
*/
DefaultExtraField(final int headerID) {
UShort.check(headerID, "Header ID out of range", null);
this.headerID = headerID;
}
public int getHeaderID() {
return headerID;
}
int getDataSize() {
return data != null ? data.length : 0;
}
void readFrom(final byte[] data, final int off, final int size) {
UShort.check(size, "Data Size out of range", null);
this.data = new byte[size];
System.arraycopy(data, off, this.data, 0, size);
}
void writeTo(byte[] data, int off) {
if (this.data != null)
System.arraycopy(this.data, 0, data, off, this.data.length);
}
}