1 /* 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.io; 27 28 /** 29 * Utility methods for packing/unpacking primitive values in/out of byte arrays 30 * using big-endian byte ordering. 31 */ 32 class Bits { 33 34 /* 35 * Methods for unpacking primitive values from byte arrays starting at 36 * given offsets. 37 */ 38 getBoolean(byte[] b, int off)39 static boolean getBoolean(byte[] b, int off) { 40 return b[off] != 0; 41 } 42 getChar(byte[] b, int off)43 static char getChar(byte[] b, int off) { 44 return (char) ((b[off + 1] & 0xFF) + 45 (b[off] << 8)); 46 } 47 getShort(byte[] b, int off)48 static short getShort(byte[] b, int off) { 49 return (short) ((b[off + 1] & 0xFF) + 50 (b[off] << 8)); 51 } 52 getInt(byte[] b, int off)53 static int getInt(byte[] b, int off) { 54 return ((b[off + 3] & 0xFF) ) + 55 ((b[off + 2] & 0xFF) << 8) + 56 ((b[off + 1] & 0xFF) << 16) + 57 ((b[off ] ) << 24); 58 } 59 getFloat(byte[] b, int off)60 static float getFloat(byte[] b, int off) { 61 return Float.intBitsToFloat(getInt(b, off)); 62 } 63 getLong(byte[] b, int off)64 static long getLong(byte[] b, int off) { 65 return ((b[off + 7] & 0xFFL) ) + 66 ((b[off + 6] & 0xFFL) << 8) + 67 ((b[off + 5] & 0xFFL) << 16) + 68 ((b[off + 4] & 0xFFL) << 24) + 69 ((b[off + 3] & 0xFFL) << 32) + 70 ((b[off + 2] & 0xFFL) << 40) + 71 ((b[off + 1] & 0xFFL) << 48) + 72 (((long) b[off]) << 56); 73 } 74 getDouble(byte[] b, int off)75 static double getDouble(byte[] b, int off) { 76 return Double.longBitsToDouble(getLong(b, off)); 77 } 78 79 /* 80 * Methods for packing primitive values into byte arrays starting at given 81 * offsets. 82 */ 83 putBoolean(byte[] b, int off, boolean val)84 static void putBoolean(byte[] b, int off, boolean val) { 85 b[off] = (byte) (val ? 1 : 0); 86 } 87 putChar(byte[] b, int off, char val)88 static void putChar(byte[] b, int off, char val) { 89 b[off + 1] = (byte) (val ); 90 b[off ] = (byte) (val >>> 8); 91 } 92 putShort(byte[] b, int off, short val)93 static void putShort(byte[] b, int off, short val) { 94 b[off + 1] = (byte) (val ); 95 b[off ] = (byte) (val >>> 8); 96 } 97 putInt(byte[] b, int off, int val)98 static void putInt(byte[] b, int off, int val) { 99 b[off + 3] = (byte) (val ); 100 b[off + 2] = (byte) (val >>> 8); 101 b[off + 1] = (byte) (val >>> 16); 102 b[off ] = (byte) (val >>> 24); 103 } 104 putFloat(byte[] b, int off, float val)105 static void putFloat(byte[] b, int off, float val) { 106 putInt(b, off, Float.floatToIntBits(val)); 107 } 108 putLong(byte[] b, int off, long val)109 static void putLong(byte[] b, int off, long val) { 110 b[off + 7] = (byte) (val ); 111 b[off + 6] = (byte) (val >>> 8); 112 b[off + 5] = (byte) (val >>> 16); 113 b[off + 4] = (byte) (val >>> 24); 114 b[off + 3] = (byte) (val >>> 32); 115 b[off + 2] = (byte) (val >>> 40); 116 b[off + 1] = (byte) (val >>> 48); 117 b[off ] = (byte) (val >>> 56); 118 } 119 putDouble(byte[] b, int off, double val)120 static void putDouble(byte[] b, int off, double val) { 121 putLong(b, off, Double.doubleToLongBits(val)); 122 } 123 } 124