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/*
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* Copyright (c) 2001, 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.io;
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/**
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* Utility methods for packing/unpacking primitive values in/out of byte arrays
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* using big-endian byte ordering.
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*/
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class Bits {
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/*
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* Methods for unpacking primitive values from byte arrays starting at
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* given offsets.
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*/
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static boolean getBoolean(byte[] b, int off) {
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return b[off] != 0;
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}
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static char getChar(byte[] b, int off) {
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return (char) ((b[off + 1] & 0xFF) +
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(b[off] << 8));
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}
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static short getShort(byte[] b, int off) {
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return (short) ((b[off + 1] & 0xFF) +
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(b[off] << 8));
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}
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static int getInt(byte[] b, int off) {
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return ((b[off + 3] & 0xFF) ) +
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((b[off + 2] & 0xFF) << 8) +
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((b[off + 1] & 0xFF) << 16) +
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((b[off ] ) << 24);
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}
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static float getFloat(byte[] b, int off) {
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return Float.intBitsToFloat(getInt(b, off));
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}
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static long getLong(byte[] b, int off) {
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return ((b[off + 7] & 0xFFL) ) +
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((b[off + 6] & 0xFFL) << 8) +
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((b[off + 5] & 0xFFL) << 16) +
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((b[off + 4] & 0xFFL) << 24) +
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((b[off + 3] & 0xFFL) << 32) +
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((b[off + 2] & 0xFFL) << 40) +
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((b[off + 1] & 0xFFL) << 48) +
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(((long) b[off]) << 56);
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}
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static double getDouble(byte[] b, int off) {
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return Double.longBitsToDouble(getLong(b, off));
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}
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/*
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* Methods for packing primitive values into byte arrays starting at given
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* offsets.
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*/
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static void putBoolean(byte[] b, int off, boolean val) {
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b[off] = (byte) (val ? 1 : 0);
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}
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static void putChar(byte[] b, int off, char val) {
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b[off + 1] = (byte) (val );
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b[off ] = (byte) (val >>> 8);
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}
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static void putShort(byte[] b, int off, short val) {
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b[off + 1] = (byte) (val );
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b[off ] = (byte) (val >>> 8);
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}
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static void putInt(byte[] b, int off, int val) {
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b[off + 3] = (byte) (val );
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b[off + 2] = (byte) (val >>> 8);
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b[off + 1] = (byte) (val >>> 16);
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b[off ] = (byte) (val >>> 24);
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}
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static void putFloat(byte[] b, int off, float val) {
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putInt(b, off, Float.floatToIntBits(val));
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}
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static void putLong(byte[] b, int off, long val) {
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b[off + 7] = (byte) (val );
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b[off + 6] = (byte) (val >>> 8);
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b[off + 5] = (byte) (val >>> 16);
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b[off + 4] = (byte) (val >>> 24);
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b[off + 3] = (byte) (val >>> 32);
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b[off + 2] = (byte) (val >>> 40);
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b[off + 1] = (byte) (val >>> 48);
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b[off ] = (byte) (val >>> 56);
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}
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static void putDouble(byte[] b, int off, double val) {
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putLong(b, off, Double.doubleToLongBits(val));
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}
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}
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