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| 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 | + | |
| 39 | + static boolean getBoolean(byte[] b, int off) { | |
| 40 | + return b[off] != 0; | |
| 41 | + } | |
| 42 | + | |
| 43 | + static char getChar(byte[] b, int off) { | |
| 44 | + return (char) ((b[off + 1] & 0xFF) + | |
| 45 | + (b[off] << 8)); | |
| 46 | + } | |
| 47 | + | |
| 48 | + static short getShort(byte[] b, int off) { | |
| 49 | + return (short) ((b[off + 1] & 0xFF) + | |
| 50 | + (b[off] << 8)); | |
| 51 | + } | |
| 52 | + | |
| 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 | + | |
| 60 | + static float getFloat(byte[] b, int off) { | |
| 61 | + return Float.intBitsToFloat(getInt(b, off)); | |
| 62 | + } | |
| 63 | + | |
| 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 | + | |
| 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 | + | |
| 84 | + static void putBoolean(byte[] b, int off, boolean val) { | |
| 85 | + b[off] = (byte) (val ? 1 : 0); | |
| 86 | + } | |
| 87 | + | |
| 88 | + static void putChar(byte[] b, int off, char val) { | |
| 89 | + b[off + 1] = (byte) (val ); | |
| 90 | + b[off ] = (byte) (val >>> 8); | |
| 91 | + } | |
| 92 | + | |
| 93 | + static void putShort(byte[] b, int off, short val) { | |
| 94 | + b[off + 1] = (byte) (val ); | |
| 95 | + b[off ] = (byte) (val >>> 8); | |
| 96 | + } | |
| 97 | + | |
| 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 | + | |
| 105 | + static void putFloat(byte[] b, int off, float val) { | |
| 106 | + putInt(b, off, Float.floatToIntBits(val)); | |
| 107 | + } | |
| 108 | + | |
| 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 | + | |
| 120 | + static void putDouble(byte[] b, int off, double val) { | |
| 121 | + putLong(b, off, Double.doubleToLongBits(val)); | |
| 122 | + } | |
| 123 | +} | |