arrayutils.java

java 编写的一个FAT16读写源代码 支持长文件名和子目录

/*---------------------------------------------------------------------------
 *  Copyright (C) 2008 Maxim Integrated Products, Inc., All Rights Reserved.
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a
 *  copy of this software and associated documentation files (the "Software"),
 *  to deal in the Software without restriction, including without limitation
 *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
 *  and/or sell copies of the Software, and to permit persons to whom the
 *  Software is furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included
 *  in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY,  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 *  IN NO EVENT SHALL MAXIM INTEGRATED PRODUCTS INC. BE LIABLE FOR ANY CLAIM,
 *  DAMAGES, OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 *  OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 *  USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *  Except as contained in this notice, the name of Maxim Integrated Products,
 *  Inc. shall not be used except as stated in the Maxim Integrated Products,
 *  Inc. Branding Policy.
 * ---------------------------------------------------------------------------
 */

package com.dalsemi.fs.fat;

public class ArrayUtils
{
    public static int getInt(byte[] arr, int offset)
    {
        return ((arr[offset + 0] & 0x0FF) <<  0) |
               ((arr[offset + 1] & 0x0FF) <<  8) |
               ((arr[offset + 2] & 0x0FF) << 16) |
               ((arr[offset + 3] & 0x0FF) << 24);
    }

    public static int getShort(byte[] arr, int offset)
    {
        return ((arr[offset + 0] & 0x0FF) << 0) |
               ((arr[offset + 1] & 0x0FF) << 8);
    }

    public static int getByte(byte[] arr, int offset)
    {
        return (arr[offset] & 0x0FF);
    }

    public static void putInt(int val, byte[] arr, int offset)
    {
        arr[offset + 0] = (byte)(val >>  0);
        arr[offset + 1] = (byte)(val >>  8);
        arr[offset + 2] = (byte)(val >> 16);
        arr[offset + 3] = (byte)(val >> 24);
    }

    public static void putShort(int val, byte[] arr, int offset)
    {
        arr[offset + 0] = (byte)(val >> 0);
        arr[offset + 1] = (byte)(val >> 8);
    }

    public static void putByte(int val, byte[] arr, int offset)
    {
        arr[offset] = (byte)val;
    }
}