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Apache Commons Compress 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.arj;

import java.util.Arrays;

class MainHeader {
    int archiverVersionNumber;
    int minVersionToExtract;
    int hostOS;
    int arjFlags;
    int securityVersion;
    int fileType;
    int reserved;
    int dateTimeCreated;
    int dateTimeModified;
    long archiveSize;
    int securityEnvelopeFilePosition;
    int fileSpecPosition;
    int securityEnvelopeLength;
    int encryptionVersion;
    int lastChapter;
    int arjProtectionFactor;
    int arjFlags2;
    String name;
    String comment;
    byte[] extendedHeaderBytes = null;
    
    static class Flags {
        static final int GARBLED = 0x01;
        static final int OLD_SECURED_NEW_ANSI_PAGE = 0x02;
        static final int VOLUME = 0x04;
        static final int ARJPROT = 0x08;
        static final int PATHSYM = 0x10;
        static final int BACKUP = 0x20;
        static final int SECURED = 0x40;
        static final int ALTNAME = 0x80;
    }

    
    @Override
    public String toString() {
        final StringBuilder builder = new StringBuilder();
        builder.append("MainHeader [archiverVersionNumber=");
        builder.append(archiverVersionNumber);
        builder.append(", minVersionToExtract=");
        builder.append(minVersionToExtract);
        builder.append(", hostOS=");
        builder.append(hostOS);
        builder.append(", arjFlags=");
        builder.append(arjFlags);
        builder.append(", securityVersion=");
        builder.append(securityVersion);
        builder.append(", fileType=");
        builder.append(fileType);
        builder.append(", reserved=");
        builder.append(reserved);
        builder.append(", dateTimeCreated=");
        builder.append(dateTimeCreated);
        builder.append(", dateTimeModified=");
        builder.append(dateTimeModified);
        builder.append(", archiveSize=");
        builder.append(archiveSize);
        builder.append(", securityEnvelopeFilePosition=");
        builder.append(securityEnvelopeFilePosition);
        builder.append(", fileSpecPosition=");
        builder.append(fileSpecPosition);
        builder.append(", securityEnvelopeLength=");
        builder.append(securityEnvelopeLength);
        builder.append(", encryptionVersion=");
        builder.append(encryptionVersion);
        builder.append(", lastChapter=");
        builder.append(lastChapter);
        builder.append(", arjProtectionFactor=");
        builder.append(arjProtectionFactor);
        builder.append(", arjFlags2=");
        builder.append(arjFlags2);
        builder.append(", name=");
        builder.append(name);
        builder.append(", comment=");
        builder.append(comment);
        builder.append(", extendedHeaderBytes=");
        builder.append(Arrays.toString(extendedHeaderBytes));
        builder.append("]");
        return builder.toString();
    }
}