src/java.base/share/classes/java/util/zip/ZipConstants.java

/*
 * Copyright (c) 1995, 2024, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package java.util.zip;

/*
 * This interface defines the constants that are used by the classes
 * which manipulate ZIP files.
 *
 * @author      David Connelly
 * @since 1.1
 */
interface ZipConstants {

    /**
     * Local file (LOC) header signature.
     */
    static long LOCSIG = 0x04034b50L;   // "PK\003\004"

    /**
     * Extra local (EXT) header signature.
     */
    static long EXTSIG = 0x08074b50L;   // "PK\007\008"

    /**
     * Central directory (CEN) header signature.
     */
    static long CENSIG = 0x02014b50L;   // "PK\001\002"

    /**
     * End of central directory (END) header signature.
     */
    static long ENDSIG = 0x06054b50L;   // "PK\005\006"

    /**
     * Local file (LOC) header size in bytes (including signature).
     */
    static final int LOCHDR = 30;

    /**
     * Extra local (EXT) header size in bytes (including signature).
     */
    static final int EXTHDR = 16;

    /**
     * Central directory (CEN) header size in bytes (including signature).
     */
    static final int CENHDR = 46;

    /**
     * End of central directory (END) header size in bytes (including signature).
     */
    static final int ENDHDR = 22;

    /**
     * Local file (LOC) header version needed to extract field offset.
     */
    static final int LOCVER = 4;

    /**
     * Local file (LOC) header general purpose bit flag field offset.
     */
    static final int LOCFLG = 6;

    /**
     * Local file (LOC) header compression method field offset.
     */
    static final int LOCHOW = 8;

    /**
     * Local file (LOC) header modification time field offset.
     */
    static final int LOCTIM = 10;

    /**
     * Local file (LOC) header uncompressed file crc-32 value field offset.
     */
    static final int LOCCRC = 14;

    /**
     * Local file (LOC) header compressed size field offset.
     */
    static final int LOCSIZ = 18;

    /**
     * Local file (LOC) header uncompressed size field offset.
     */
    static final int LOCLEN = 22;

    /**
     * Local file (LOC) header filename length field offset.
     */
    static final int LOCNAM = 26;

    /**
     * Local file (LOC) header extra field length field offset.
     */
    static final int LOCEXT = 28;

    /**
     * Extra local (EXT) header uncompressed file crc-32 value field offset.
     */
    static final int EXTCRC = 4;

    /**
     * Extra local (EXT) header compressed size field offset.
     */
    static final int EXTSIZ = 8;

    /**
     * Extra local (EXT) header uncompressed size field offset.
     */
    static final int EXTLEN = 12;

    /**
     * Central directory (CEN) header version made by field offset.
     */
    static final int CENVEM = 4;

    /**
     * Central directory (CEN) header version needed to extract field offset.
     */
    static final int CENVER = 6;

    /**
     * Central directory (CEN) header encrypt, decrypt flags field offset.
     */
    static final int CENFLG = 8;

    /**
     * Central directory (CEN) header compression method field offset.
     */
    static final int CENHOW = 10;

    /**
     * Central directory (CEN) header modification time field offset.
     */
    static final int CENTIM = 12;

    /**
     * Central directory (CEN) header uncompressed file crc-32 value field offset.
     */
    static final int CENCRC = 16;

    /**
     * Central directory (CEN) header compressed size field offset.
     */
    static final int CENSIZ = 20;

    /**
     * Central directory (CEN) header uncompressed size field offset.
     */
    static final int CENLEN = 24;

    /**
     * Central directory (CEN) header filename length field offset.
     */
    static final int CENNAM = 28;

    /**
     * Central directory (CEN) header extra field length field offset.
     */
    static final int CENEXT = 30;

    /**
     * Central directory (CEN) header comment length field offset.
     */
    static final int CENCOM = 32;

    /**
     * Central directory (CEN) header disk number start field offset.
     */
    static final int CENDSK = 34;

    /**
     * Central directory (CEN) header internal file attributes field offset.
     */
    static final int CENATT = 36;

    /**
     * Central directory (CEN) header external file attributes field offset.
     */
    static final int CENATX = 38;

    /**
     * Central directory (CEN) header LOC header offset field offset.
     */
    static final int CENOFF = 42;

    /**
     * End of central directory (END) header number of entries on this disk field offset.
     */
    static final int ENDSUB = 8;

    /**
     * End of central directory (END) header total number of entries field offset.
     */
    static final int ENDTOT = 10;

    /**
     * End of central directory (END) header central directory size in bytes field offset.
     */
    static final int ENDSIZ = 12;

    /**
     * End of central directory (END) header offset for the first CEN header field offset.
     */
    static final int ENDOFF = 16;

    /**
     * End of central directory (END) header ZIP file comment length field offset.
     */
    static final int ENDCOM = 20;
}