/*
 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation. Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package java.io;

/**
 * Utility methods for packing/unpacking primitive values in/out of byte arrays
 * using big-endian byte ordering.
 */
class Bits {

 /*
 * Methods for unpacking primitive values from byte arrays starting at
 * given offsets.
 */

 static boolean getBoolean(byte[] b, int off) {
 return b[off] != 0;
 }

 static char getChar(byte[] b, int off) {
 return (char) ((b[off + 1] & 0xFF) +
 (b[off] << 8));
 }

 static short getShort(byte[] b, int off) {
 return (short) ((b[off + 1] & 0xFF) +
 (b[off] << 8));
 }

 static int getInt(byte[] b, int off) {
 return ((b[off + 3] & 0xFF) ) +
 ((b[off + 2] & 0xFF) << 8) +
 ((b[off + 1] & 0xFF) << 16) +
 ((b[off ] ) << 24);
 }

 static float getFloat(byte[] b, int off) {
 return Float.intBitsToFloat(getInt(b, off));
 }

 static long getLong(byte[] b, int off) {
 return ((b[off + 7] & 0xFFL) ) +
 ((b[off + 6] & 0xFFL) << 8) +
 ((b[off + 5] & 0xFFL) << 16) +
 ((b[off + 4] & 0xFFL) << 24) +
 ((b[off + 3] & 0xFFL) << 32) +
 ((b[off + 2] & 0xFFL) << 40) +
 ((b[off + 1] & 0xFFL) << 48) +
 (((long) b[off]) << 56);
 }

 static double getDouble(byte[] b, int off) {
 return Double.longBitsToDouble(getLong(b, off));
 }

 /*
 * Methods for packing primitive values into byte arrays starting at given
 * offsets.
 */

 static void putBoolean(byte[] b, int off, boolean val) {
 b[off] = (byte) (val ? 1 : 0);
 }

 static void putChar(byte[] b, int off, char val) {
 b[off + 1] = (byte) (val );
 b[off ] = (byte) (val >>> 8);
 }

 static void putShort(byte[] b, int off, short val) {
 b[off + 1] = (byte) (val );
 b[off ] = (byte) (val >>> 8);
 }

 static void putInt(byte[] b, int off, int val) {
 b[off + 3] = (byte) (val );
 b[off + 2] = (byte) (val >>> 8);
 b[off + 1] = (byte) (val >>> 16);
 b[off ] = (byte) (val >>> 24);
 }

 static void putFloat(byte[] b, int off, float val) {
 putInt(b, off, Float.floatToIntBits(val));
 }

 static void putLong(byte[] b, int off, long val) {
 b[off + 7] = (byte) (val );
 b[off + 6] = (byte) (val >>> 8);
 b[off + 5] = (byte) (val >>> 16);
 b[off + 4] = (byte) (val >>> 24);
 b[off + 3] = (byte) (val >>> 32);
 b[off + 2] = (byte) (val >>> 40);
 b[off + 1] = (byte) (val >>> 48);
 b[off ] = (byte) (val >>> 56);
 }

 static void putDouble(byte[] b, int off, double val) {
 putLong(b, off, Double.doubleToLongBits(val));
 }
}