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 implements ZipExtraField {
046    private static final long serialVersionUID = 1L;
047
048    public X0016_CertificateIdForCentralDirectory() {
049        super(new ZipShort(0x0016));
050    }
051
052    private int rcount;
053    private HashAlgorithm hashAlg;
054
055    /**
056     * Get record count.
057     * @return the record count
058     */
059    public int getRecordCount() {
060        return rcount;
061    }
062
063    /**
064     * Get hash algorithm.
065     * @return the hash algorithm
066     */
067    public HashAlgorithm getHashAlgorithm() {
068        return hashAlg;
069    }
070
071    @Override
072    public void parseFromCentralDirectoryData(byte[] data, int offset, int length) {
073        this.rcount = ZipShort.getValue(data, offset);
074        this.hashAlg = HashAlgorithm.getAlgorithmByCode(ZipShort.getValue(data, offset + 2));
075    }
076}