ant/src/main/org/apache/tools/zip/ZipLong.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001-2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 *
 * 5. Products derived from this software may not be called "Apache"
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 *
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.tools.zip;

/**
 * Utility class that represents a four byte integer with conversion
 * rules for the big endian byte order of ZIP files.
 *
 * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a>
 * @version $Revision$
 */
public final class ZipLong implements Cloneable {

    private long value;

    /**
     * Create instance from a number.
     *
     * @since 1.1
     */
    public ZipLong(long value) {
        this.value = value;
    }

    /**
     * Create instance from bytes.
     *
     * @since 1.1
     */
    public ZipLong (byte[] bytes) {
        this(bytes, 0);
    }

    /**
     * Create instance from the four bytes starting at offset.
     *
     * @since 1.1
     */
    public ZipLong (byte[] bytes, int offset) {
        value = (bytes[offset + 3] << 24) & 0xFF000000l;
        value += (bytes[offset + 2] << 16) & 0xFF0000;
        value += (bytes[offset + 1] << 8) & 0xFF00;
        value += (bytes[offset] & 0xFF);
    }

    /**
     * Get value as two bytes in big endian byte order.
     *
     * @since 1.1
     */
    public byte[] getBytes() {
        byte[] result = new byte[4];
        result[0] = (byte) ((value & 0xFF));
        result[1] = (byte) ((value & 0xFF00) >> 8);
        result[2] = (byte) ((value & 0xFF0000) >> 16);
        result[3] = (byte) ((value & 0xFF000000l) >> 24);
        return result;
    }

    /**
     * Get value as Java int.
     *
     * @since 1.1
     */
    public long getValue() {
        return value;
    }

    /**
     * Override to make two instances with same value equal.
     *
     * @since 1.1
     */
    public boolean equals(Object o) {
        if (o == null || !(o instanceof ZipLong)) {
            return false;
        }
        return value == ((ZipLong) o).getValue();
    }

    /**
     * Override to make two instances with same value equal.
     *
     * @since 1.1
     */
    public int hashCode() {
        return (int) value;
    }

}// ZipLong