jaroslav@601: /*
jaroslav@601:  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
jaroslav@601:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jaroslav@601:  *
jaroslav@601:  * This code is free software; you can redistribute it and/or modify it
jaroslav@601:  * under the terms of the GNU General Public License version 2 only, as
jaroslav@601:  * published by the Free Software Foundation.  Oracle designates this
jaroslav@601:  * particular file as subject to the "Classpath" exception as provided
jaroslav@601:  * by Oracle in the LICENSE file that accompanied this code.
jaroslav@601:  *
jaroslav@601:  * This code is distributed in the hope that it will be useful, but WITHOUT
jaroslav@601:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jaroslav@601:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jaroslav@601:  * version 2 for more details (a copy is included in the LICENSE file that
jaroslav@601:  * accompanied this code).
jaroslav@601:  *
jaroslav@601:  * You should have received a copy of the GNU General Public License version
jaroslav@601:  * 2 along with this work; if not, write to the Free Software Foundation,
jaroslav@601:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jaroslav@601:  *
jaroslav@601:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jaroslav@601:  * or visit www.oracle.com if you need additional information or have any
jaroslav@601:  * questions.
jaroslav@601:  */
jaroslav@601: 
jaroslav@601: package java.io;
jaroslav@601: 
jaroslav@601: /**
jaroslav@601:  * Utility methods for packing/unpacking primitive values in/out of byte arrays
jaroslav@601:  * using big-endian byte ordering.
jaroslav@601:  */
jaroslav@601: class Bits {
jaroslav@601: 
jaroslav@601:     /*
jaroslav@601:      * Methods for unpacking primitive values from byte arrays starting at
jaroslav@601:      * given offsets.
jaroslav@601:      */
jaroslav@601: 
jaroslav@601:     static boolean getBoolean(byte[] b, int off) {
jaroslav@601:         return b[off] != 0;
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static char getChar(byte[] b, int off) {
jaroslav@601:         return (char) ((b[off + 1] & 0xFF) +
jaroslav@601:                        (b[off] << 8));
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static short getShort(byte[] b, int off) {
jaroslav@601:         return (short) ((b[off + 1] & 0xFF) +
jaroslav@601:                         (b[off] << 8));
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static int getInt(byte[] b, int off) {
jaroslav@601:         return ((b[off + 3] & 0xFF)      ) +
jaroslav@601:                ((b[off + 2] & 0xFF) <<  8) +
jaroslav@601:                ((b[off + 1] & 0xFF) << 16) +
jaroslav@601:                ((b[off    ]       ) << 24);
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static float getFloat(byte[] b, int off) {
jaroslav@601:         return Float.intBitsToFloat(getInt(b, off));
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static long getLong(byte[] b, int off) {
jaroslav@601:         return ((b[off + 7] & 0xFFL)      ) +
jaroslav@601:                ((b[off + 6] & 0xFFL) <<  8) +
jaroslav@601:                ((b[off + 5] & 0xFFL) << 16) +
jaroslav@601:                ((b[off + 4] & 0xFFL) << 24) +
jaroslav@601:                ((b[off + 3] & 0xFFL) << 32) +
jaroslav@601:                ((b[off + 2] & 0xFFL) << 40) +
jaroslav@601:                ((b[off + 1] & 0xFFL) << 48) +
jaroslav@601:                (((long) b[off])      << 56);
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static double getDouble(byte[] b, int off) {
jaroslav@601:         return Double.longBitsToDouble(getLong(b, off));
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     /*
jaroslav@601:      * Methods for packing primitive values into byte arrays starting at given
jaroslav@601:      * offsets.
jaroslav@601:      */
jaroslav@601: 
jaroslav@601:     static void putBoolean(byte[] b, int off, boolean val) {
jaroslav@601:         b[off] = (byte) (val ? 1 : 0);
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static void putChar(byte[] b, int off, char val) {
jaroslav@601:         b[off + 1] = (byte) (val      );
jaroslav@601:         b[off    ] = (byte) (val >>> 8);
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static void putShort(byte[] b, int off, short val) {
jaroslav@601:         b[off + 1] = (byte) (val      );
jaroslav@601:         b[off    ] = (byte) (val >>> 8);
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static void putInt(byte[] b, int off, int val) {
jaroslav@601:         b[off + 3] = (byte) (val       );
jaroslav@601:         b[off + 2] = (byte) (val >>>  8);
jaroslav@601:         b[off + 1] = (byte) (val >>> 16);
jaroslav@601:         b[off    ] = (byte) (val >>> 24);
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static void putFloat(byte[] b, int off, float val) {
jaroslav@601:         putInt(b, off,  Float.floatToIntBits(val));
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static void putLong(byte[] b, int off, long val) {
jaroslav@601:         b[off + 7] = (byte) (val       );
jaroslav@601:         b[off + 6] = (byte) (val >>>  8);
jaroslav@601:         b[off + 5] = (byte) (val >>> 16);
jaroslav@601:         b[off + 4] = (byte) (val >>> 24);
jaroslav@601:         b[off + 3] = (byte) (val >>> 32);
jaroslav@601:         b[off + 2] = (byte) (val >>> 40);
jaroslav@601:         b[off + 1] = (byte) (val >>> 48);
jaroslav@601:         b[off    ] = (byte) (val >>> 56);
jaroslav@601:     }
jaroslav@601: 
jaroslav@601:     static void putDouble(byte[] b, int off, double val) {
jaroslav@601:         putLong(b, off, Double.doubleToLongBits(val));
jaroslav@601:     }
jaroslav@601: }