com.feilong.lib.compress.archivers.zip.UnrecognizedExtraField Maven / Gradle / Ivy

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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
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/*
 * 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 com.feilong.lib.compress.archivers.zip;

import java.util.Arrays;

/**
 * Simple placeholder for all those extra fields we don't want to deal
 * with.
 *
 * 
 * Assumes local file data and central directory entries are
 * identical - unless told the opposite.
 * 
 * 
 * @NotThreadSafe
 */
public class UnrecognizedExtraField implements ZipExtraField{

    /**
     * The Header-ID.
     */
    private ZipShort headerId;

    /**
     * Set the header id.
     * 
     * @param headerId
     *            the header id to use
     */
    public void setHeaderId(final ZipShort headerId){
        this.headerId = headerId;
    }

    /**
     * Get the header id.
     * 
     * @return the header id
     */
    @Override
    public ZipShort getHeaderId(){
        return headerId;
    }

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

    /**
     * Set the extra field data in the local file data -
     * without Header-ID or length specifier.
     * 
     * @param data
     *            the field data to use
     */
    public void setLocalFileDataData(final byte[] data){
        localData = ZipUtil.copy(data);
    }

    /**
     * Get the length of the local data.
     * 
     * @return the length of the local data
     */
    @Override
    public ZipShort getLocalFileDataLength(){
        return new ZipShort(localData != null ? localData.length : 0);
    }

    /**
     * Get the local data.
     * 
     * @return the local data
     */
    @Override
    public byte[] getLocalFileDataData(){
        return ZipUtil.copy(localData);
    }

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

    /**
     * Set the extra field data in central directory.
     * 
     * @param data
     *            the data to use
     */
    public void setCentralDirectoryData(final byte[] data){
        centralData = ZipUtil.copy(data);
    }

    /**
     * Get the central data length.
     * If there is no central data, get the local file data length.
     * 
     * @return the central data length
     */
    @Override
    public ZipShort getCentralDirectoryLength(){
        if (centralData != null){
            return new ZipShort(centralData.length);
        }
        return getLocalFileDataLength();
    }

    /**
     * Get the central data.
     * 
     * @return the central data if present, else return the local file data
     */
    @Override
    public byte[] getCentralDirectoryData(){
        if (centralData != null){
            return ZipUtil.copy(centralData);
        }
        return getLocalFileDataData();
    }

    /**
     * @param data
     *            the array of bytes.
     * @param offset
     *            the source location in the data array.
     * @param length
     *            the number of bytes to use in the data array.
     * @see ZipExtraField#parseFromLocalFileData(byte[], int, int)
     */
    @Override
    public void parseFromLocalFileData(final byte[] data,final int offset,final int length){
        setLocalFileDataData(Arrays.copyOfRange(data, offset, offset + length));
    }

    /**
     * @param data
     *            the array of bytes.
     * @param offset
     *            the source location in the data array.
     * @param length
     *            the number of bytes to use in the data array.
     * @see ZipExtraField#parseFromCentralDirectoryData(byte[], int, int)
     */
    @Override
    public void parseFromCentralDirectoryData(final byte[] data,final int offset,final int length){
        final byte[] tmp = Arrays.copyOfRange(data, offset, offset + length);
        setCentralDirectoryData(tmp);
        if (localData == null){
            setLocalFileDataData(tmp);
        }
    }

}