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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.

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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 org.apache.commons.compress.archivers.zip;

import java.util.zip.ZipException;

/**
 * General format of extra field data.
 *
 * Extra fields usually appear twice per file, once in the local
 * file data and once in the central directory.  Usually they are the
 * same, but they don't have to be.  {@link
 * java.util.zip.ZipOutputStream java.util.zip.ZipOutputStream} will
 * only use the local file data in both places.
 *
 */
public interface ZipExtraField {
    /**
     * Size of an extra field field header (id + length).
     * @since 1.14
     */
    int EXTRAFIELD_HEADER_SIZE = 4;

    /**
     * The Header-ID.
     *
     * @return The HeaderId value
     */
    ZipShort getHeaderId();

    /**
     * Length of the extra field in the local file data - without
     * Header-ID or length specifier.
     * @return the length of the field in the local file data
     */
    ZipShort getLocalFileDataLength();

    /**
     * Length of the extra field in the central directory - without
     * Header-ID or length specifier.
     * @return the length of the field in the central directory
     */
    ZipShort getCentralDirectoryLength();

    /**
     * The actual data to put into local file data - without Header-ID
     * or length specifier.
     * @return the data
     */
    byte[] getLocalFileDataData();

    /**
     * The actual data to put into central directory - without Header-ID or
     * length specifier.
     * @return the data
     */
    byte[] getCentralDirectoryData();

    /**
     * Populate data from this array as if it was in local file data.
     *
     * @param buffer the buffer to read data from
     * @param offset offset into buffer to read data
     * @param length the length of data
     * @throws ZipException on error
     */
    void parseFromLocalFileData(byte[] buffer, int offset, int length)
        throws ZipException;

    /**
     * Populate data from this array as if it was in central directory data.
     *
     * @param buffer the buffer to read data from
     * @param offset offset into buffer to read data
     * @param length the length of data
     * @throws ZipException on error
     */
    void parseFromCentralDirectoryData(byte[] buffer, int offset, int length)
        throws ZipException;
}