Source Code Cross Referenced for Bits.java in  » 6.0-JDK-Core » io-nio » java » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Core » io nio » java.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001        /*
002         * Copyright 2001-2005 Sun Microsystems, Inc.  All Rights Reserved.
003         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004         *
005         * This code is free software; you can redistribute it and/or modify it
006         * under the terms of the GNU General Public License version 2 only, as
007         * published by the Free Software Foundation.  Sun designates this
008         * particular file as subject to the "Classpath" exception as provided
009         * by Sun in the LICENSE file that accompanied this code.
010         *
011         * This code is distributed in the hope that it will be useful, but WITHOUT
012         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014         * version 2 for more details (a copy is included in the LICENSE file that
015         * accompanied this code).
016         *
017         * You should have received a copy of the GNU General Public License version
018         * 2 along with this work; if not, write to the Free Software Foundation,
019         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020         *
021         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022         * CA 95054 USA or visit www.sun.com if you need additional information or
023         * have any questions.
024         */
025
026        package java.io;
027
028        /**
029         * Utility methods for packing/unpacking primitive values in/out of byte arrays
030         * using big-endian byte ordering.
031         */
032        class Bits {
033
034            /*
035             * Methods for unpacking primitive values from byte arrays starting at
036             * given offsets.
037             */
038
039            static boolean getBoolean(byte[] b, int off) {
040                return b[off] != 0;
041            }
042
043            static char getChar(byte[] b, int off) {
044                return (char) (((b[off + 1] & 0xFF) << 0) + ((b[off + 0]) << 8));
045            }
046
047            static short getShort(byte[] b, int off) {
048                return (short) (((b[off + 1] & 0xFF) << 0) + ((b[off + 0]) << 8));
049            }
050
051            static int getInt(byte[] b, int off) {
052                return ((b[off + 3] & 0xFF) << 0) + ((b[off + 2] & 0xFF) << 8)
053                        + ((b[off + 1] & 0xFF) << 16) + ((b[off + 0]) << 24);
054            }
055
056            static float getFloat(byte[] b, int off) {
057                int i = ((b[off + 3] & 0xFF) << 0) + ((b[off + 2] & 0xFF) << 8)
058                        + ((b[off + 1] & 0xFF) << 16) + ((b[off + 0]) << 24);
059                return Float.intBitsToFloat(i);
060            }
061
062            static long getLong(byte[] b, int off) {
063                return ((b[off + 7] & 0xFFL) << 0)
064                        + ((b[off + 6] & 0xFFL) << 8)
065                        + ((b[off + 5] & 0xFFL) << 16)
066                        + ((b[off + 4] & 0xFFL) << 24)
067                        + ((b[off + 3] & 0xFFL) << 32)
068                        + ((b[off + 2] & 0xFFL) << 40)
069                        + ((b[off + 1] & 0xFFL) << 48)
070                        + (((long) b[off + 0]) << 56);
071            }
072
073            static double getDouble(byte[] b, int off) {
074                long j = ((b[off + 7] & 0xFFL) << 0)
075                        + ((b[off + 6] & 0xFFL) << 8)
076                        + ((b[off + 5] & 0xFFL) << 16)
077                        + ((b[off + 4] & 0xFFL) << 24)
078                        + ((b[off + 3] & 0xFFL) << 32)
079                        + ((b[off + 2] & 0xFFL) << 40)
080                        + ((b[off + 1] & 0xFFL) << 48)
081                        + (((long) b[off + 0]) << 56);
082                return Double.longBitsToDouble(j);
083            }
084
085            /*
086             * Methods for packing primitive values into byte arrays starting at given
087             * offsets.
088             */
089
090            static void putBoolean(byte[] b, int off, boolean val) {
091                b[off] = (byte) (val ? 1 : 0);
092            }
093
094            static void putChar(byte[] b, int off, char val) {
095                b[off + 1] = (byte) (val >>> 0);
096                b[off + 0] = (byte) (val >>> 8);
097            }
098
099            static void putShort(byte[] b, int off, short val) {
100                b[off + 1] = (byte) (val >>> 0);
101                b[off + 0] = (byte) (val >>> 8);
102            }
103
104            static void putInt(byte[] b, int off, int val) {
105                b[off + 3] = (byte) (val >>> 0);
106                b[off + 2] = (byte) (val >>> 8);
107                b[off + 1] = (byte) (val >>> 16);
108                b[off + 0] = (byte) (val >>> 24);
109            }
110
111            static void putFloat(byte[] b, int off, float val) {
112                int i = Float.floatToIntBits(val);
113                b[off + 3] = (byte) (i >>> 0);
114                b[off + 2] = (byte) (i >>> 8);
115                b[off + 1] = (byte) (i >>> 16);
116                b[off + 0] = (byte) (i >>> 24);
117            }
118
119            static void putLong(byte[] b, int off, long val) {
120                b[off + 7] = (byte) (val >>> 0);
121                b[off + 6] = (byte) (val >>> 8);
122                b[off + 5] = (byte) (val >>> 16);
123                b[off + 4] = (byte) (val >>> 24);
124                b[off + 3] = (byte) (val >>> 32);
125                b[off + 2] = (byte) (val >>> 40);
126                b[off + 1] = (byte) (val >>> 48);
127                b[off + 0] = (byte) (val >>> 56);
128            }
129
130            static void putDouble(byte[] b, int off, double val) {
131                long j = Double.doubleToLongBits(val);
132                b[off + 7] = (byte) (j >>> 0);
133                b[off + 6] = (byte) (j >>> 8);
134                b[off + 5] = (byte) (j >>> 16);
135                b[off + 4] = (byte) (j >>> 24);
136                b[off + 3] = (byte) (j >>> 32);
137                b[off + 2] = (byte) (j >>> 40);
138                b[off + 1] = (byte) (j >>> 48);
139                b[off + 0] = (byte) (j >>> 56);
140            }
141        }
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