package org.codehaus.plexus.archiver.zip;

/*
 * Copyright  2001-2002,2004 The Apache Software Foundation
 *
 *  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.
 *
 */

/**
 * Simple placeholder for all those extra fields we don't want to deal
 * with.
 * <p/>
 * <p>Assumes local file data and central directory entries are
 * identical - unless told the opposite.</p>
 *
 * @version $Revision$ $Date$
 *          from org.apache.ant.tools.zip.UnrecognizedExtraField v1.8
 */
public class UnrecognizedExtraField
    implements ZipExtraField
{

    /**
     * The Header-ID.
     *
     * @since 1.1
     */
    private ZipShort headerId;

    public void setHeaderId( ZipShort headerId )
    {
        this.headerId = headerId;
    }

    public ZipShort getHeaderId()
    {
        return headerId;
    }

    /**
     * Extra field data in local file data - without
     * Header-ID or length specifier.
     *
     * @since 1.1
     */
    private byte[] localData;

    public void setLocalFileDataData( byte[] data )
    {
        localData = data;
    }

    public ZipShort getLocalFileDataLength()
    {
        return new ZipShort( localData.length );
    }

    public byte[] getLocalFileDataData()
    {
        return localData;
    }

    /**
     * Extra field data in central directory - without
     * Header-ID or length specifier.
     *
     * @since 1.1
     */
    private byte[] centralData;

    public void setCentralDirectoryData( byte[] data )
    {
        centralData = data;
    }

    public ZipShort getCentralDirectoryLength()
    {
        if ( centralData != null )
        {
            return new ZipShort( centralData.length );
        }
        return getLocalFileDataLength();
    }

    public byte[] getCentralDirectoryData()
    {
        if ( centralData != null )
        {
            return centralData;
        }
        return getLocalFileDataData();
    }

    public void parseFromLocalFileData( byte[] data, int offset, int length )
    {
        byte[] tmp = new byte[length];
        System.arraycopy( data, offset, tmp, 0, length );
        setLocalFileDataData( tmp );
    }
}
