SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package net.multiphasicapps.zip.blockreader;

/**
 * This class contains methods for reading data from arrays, all read values
 * are little endian.
 *
 * @since 2016/12/28
 */
final class __ArrayData__
{
    /**
     * Reads a signed integer from the array.
     *
     * @param __off The offset to read from.
     * @param __b The array to read from.
     * @return The read value.
     * @since 2016/12/28
     */
    static int readSignedInt(int __off, byte[] __b)
    {
        return (__b[__off + 3] << 24) |
            ((__b[__off + 2] & 0xFF) << 16) |
            ((__b[__off + 1] & 0xFF) << 8) |
            (__b[__off] & 0xFF);
    }
    
    /**
     * Reads a signed short from the array.
     *
     * @param __off The offset to read from.
     * @param __b The array to read from.
     * @return The read value.
     * @since 2016/12/28
     */
    static int readSignedShort(int __off, byte[] __b)
    {
        return (__b[__off + 1] << 8) |
            (__b[__off] & 0xFF);
    }
    
    /**
     * Reads an unsigned integer from the array.
     *
     * @param __off The offset to read from.
     * @param __b The array to read from.
     * @return The read value.
     * @since 2016/12/28
     */
    static long readUnsignedInt(int __off, byte[] __b)
    {
        return ((__b[__off + 3] & 0xFF) << 24) |
            ((__b[__off + 2] & 0xFF) << 16) |
            ((__b[__off + 1] & 0xFF) << 8) |
            (__b[__off] & 0xFF);
    }
    
    /**
     * Reads an unsigned short from the array.
     *
     * @param __off The offset to read from.
     * @param __b The array to read from.
     * @return The read value.
     * @since 2016/12/28
     */
    static int readUnsignedShort(int __off, byte[] __b)
    {
        return ((__b[__off + 1] & 0xFF) << 8) |
            (__b[__off] & 0xFF);
    }
}