001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.io;
016    
017    /**
018     * Encodes/decodes primitive types to/from big-endian byte sequences.
019     *
020     * @author Shuyang Zhou
021     */
022    public class BigEndianCodec {
023    
024            public static boolean getBoolean(byte[] bytes, int index) {
025                    return bytes[index] != 0;
026            }
027    
028            public static char getChar(byte[] bytes, int index) {
029                    return (char)((bytes[index] << 8) + (bytes[index + 1] & 0xFF));
030            }
031    
032            public static double getDouble(byte[] bytes, int index) {
033                    return Double.longBitsToDouble(getLong(bytes, index));
034            }
035    
036            public static float getFloat(byte[] bytes, int index) {
037                    return Float.intBitsToFloat(getInt(bytes, index));
038            }
039    
040            public static int getInt(byte[] bytes, int index) {
041                    return (bytes[index] << 24) + ((bytes[index + 1] & 0xFF) << 16) +
042                            ((bytes[index + 2] & 0xFF) << 8) + (bytes[index + 3] & 0xFF);
043            }
044    
045            public static long getLong(byte[] bytes, int index) {
046                    return (((long)bytes[index]) << 56) +
047                            ((bytes[index + 1] & 0xFFL) << 48) +
048                            ((bytes[index + 2] & 0xFFL) << 40) +
049                            ((bytes[index + 3] & 0xFFL) << 32) +
050                            ((bytes[index + 4] & 0xFFL) << 24) +
051                            ((bytes[index + 5] & 0xFFL) << 16) +
052                            ((bytes[index + 6] & 0xFFL) << 8) +
053                            (bytes[index + 7] & 0xFFL);
054            }
055    
056            public static short getShort(byte[] bytes, int index) {
057                    return (short)((bytes[index] << 8) + (bytes[index + 1] & 0xFF));
058            }
059    
060            public static void putBoolean(byte[] bytes, int index, boolean b) {
061                    bytes[index] = (byte)(b ? 1 : 0);
062            }
063    
064            public static void putChar(byte[] bytes, int index, char c) {
065                    bytes[index] = (byte)(c >>> 8);
066                    bytes[index + 1] = (byte)c;
067            }
068    
069            public static void putDouble(byte[] bytes, int index, double d) {
070                    putLong(bytes, index, Double.doubleToLongBits(d));
071            }
072    
073            public static void putFloat(byte[] bytes, int index, float f) {
074                    putInt(bytes, index, Float.floatToIntBits(f));
075            }
076    
077            public static void putInt(byte[] bytes, int index, int i) {
078                    bytes[index] = (byte)(i >>> 24);
079                    bytes[index + 1] = (byte)(i >>> 16);
080                    bytes[index + 2] = (byte)(i >>> 8);
081                    bytes[index + 3] = (byte)i;
082            }
083    
084            public static void putLong(byte[] bytes, int index, long l) {
085                    bytes[index] = (byte)(l >>> 56);
086                    bytes[index + 1] = (byte)(l >>> 48);
087                    bytes[index + 2] = (byte)(l >>> 40);
088                    bytes[index + 3] = (byte)(l >>> 32);
089                    bytes[index + 4] = (byte)(l >>> 24);
090                    bytes[index + 5] = (byte)(l >>> 16);
091                    bytes[index + 6] = (byte)(l >>> 8);
092                    bytes[index + 7] = (byte)l;
093            }
094    
095            public static void putShort(byte[] bytes, int index, short s) {
096                    bytes[index] = (byte)(s >>> 8);
097                    bytes[index + 1] = (byte)s;
098            }
099    
100    }