    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 * http://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.commons.compress.archivers.zip;
    020
    021/**
    022 * X.509 Certificate ID and Signature for central directory (0x0016).
    023 *
    024 * <p>This field contains the information about which certificate in the PKCS#7
    025 * store was used to sign the central directory structure. When the Central
    026 * Directory Encryption feature is enabled for a ZIP file, this record will
    027 * appear in the Archive Extra Data Record, otherwise it will appear in the
    028 * first central directory record.</p>
    029 *
    030 * <p>Note: all fields stored in Intel low-byte/high-byte order.</p>
    031 *
    032 * <pre>
    033 *         Value     Size     Description
    034 *         -----     ----     -----------
    035 * (CDID)  0x0016    2 bytes  Tag for this "extra" block type
    036 *         TSize     2 bytes  Size of data that follows
    037 *         RCount    4 bytes  Number of recipients. (inferred)
    038 *         HashAlg   2 bytes  Hash algorithm identifier. (inferred)
    039 *         TData     TSize    Data
    040 * </pre>
    041 *
    042 * @NotThreadSafe
    043 * @since 1.11
    044 */
    045public class X0016_CertificateIdForCentralDirectory extends PKWareExtraHeader {
    046
    047    public X0016_CertificateIdForCentralDirectory() {
    048        super(new ZipShort(0x0016));
    049    }
    050
    051    private int rcount;
    052    private HashAlgorithm hashAlg;
    053
    054    /**
    055     * Get record count.
    056     * @return the record count
    057     */
    058    public int getRecordCount() {
    059        return rcount;
    060    }
    061
    062    /**
    063     * Get hash algorithm.
    064     * @return the hash algorithm
    065     */
    066    public HashAlgorithm getHashAlgorithm() {
    067        return hashAlg;
    068    }
    069
    070    @Override
    071    public void parseFromCentralDirectoryData(final byte[] data, final int offset, final int length) {
    072        this.rcount = ZipShort.getValue(data, offset);
    073        this.hashAlg = HashAlgorithm.getAlgorithmByCode(ZipShort.getValue(data, offset + 2));
    074    }
    075}