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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;

final class MainHeader {

    static final 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;
    }

    static final class HostOS {
        static final int MS_DOS = 0;
        static final int PRIMOS = 1;
        static final int UNIX = 2;
        static final int AMIGA = 3;
        static final int MAC_OS = 4;
        static final int OS2 = 5;
        static final int APPLE_GS = 6;
        static final int ATARI_ST = 7;
        static final int NeXT = 8;
        static final int VAX_VMS = 9;
        static final int WIN95 = 10;
        static final int WIN32 = 11;
    }

    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;

    @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();
    }
}