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java.nio.Bits Maven / Gradle / Ivy
/*
* Copyright (c) 2000, 2016, 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.nio;
import java.util.ArrayList;
import java.util.List;
/**
* Access to bits, native and otherwise.
*/
class Bits { // package-private
private Bits() { }
// -- Swapping --
static short swap(short x) {
return (short) (((x & 0xFF00) >> 8) | (x << 8));
}
static char swap(char x) {
return (char) (((x & 0xFF00) >> 8) | (x << 8));
}
static int swap(int x) {
return ((x >>> 24) ) |
((x >> 8) & 0xFF00) |
((x << 8) & 0xFF0000) |
((x << 24));
}
static long swap(long x) {
long i = (x & 0x00ff00ff00ff00ffL) << 8 | (x >>> 8) & 0x00ff00ff00ff00ffL;
return (i << 48) | ((i & 0xffff0000L) << 16) |
((i >>> 16) & 0xffff0000L) | (i >>> 48);
}
// -- get/put char --
static private char makeChar(byte b1, byte b0) {
return (char)((b1 << 8) | (b0 & 0xff));
}
static char getCharL(ByteBuffer bb, int bi) {
return makeChar(bb.get(bi + 1),
bb.get(bi ));
}
static char getCharL(long a) {
return makeChar(_get(a + 1),
_get(a ));
}
static char getCharB(ByteBuffer bb, int bi) {
return makeChar(bb.get(bi ),
bb.get(bi + 1));
}
static char getCharB(long a) {
return makeChar(_get(a ),
_get(a + 1));
}
static char getChar(ByteBuffer bb, int bi, boolean bigEndian) {
return bigEndian ? getCharB(bb, bi) : getCharL(bb, bi);
}
static char getChar(long a, boolean bigEndian) {
return bigEndian ? getCharB(a) : getCharL(a);
}
private static byte char1(char x) { return (byte)(x >> 8); }
private static byte char0(char x) { return (byte)(x ); }
static void putCharL(ByteBuffer bb, int bi, char x) {
bb.put(bi , char0(x));
bb.put(bi + 1, char1(x));
}
static void putCharL(long a, char x) {
_put(a , char0(x));
_put(a + 1, char1(x));
}
static void putCharB(ByteBuffer bb, int bi, char x) {
bb.put(bi , char1(x));
bb.put(bi + 1, char0(x));
}
static void putCharB(long a, char x) {
_put(a , char1(x));
_put(a + 1, char0(x));
}
static void putChar(ByteBuffer bb, int bi, char x, boolean bigEndian) {
if (bigEndian)
putCharB(bb, bi, x);
else
putCharL(bb, bi, x);
}
static void putChar(long a, char x, boolean bigEndian) {
if (bigEndian)
putCharB(a, x);
else
putCharL(a, x);
}
// -- get/put short --
static private short makeShort(byte b1, byte b0) {
return (short)((b1 << 8) | (b0 & 0xff));
}
static short getShortL(ByteBuffer bb, int bi) {
return makeShort(bb.get(bi + 1),
bb.get(bi ));
}
static short getShortL(long a) {
return makeShort(_get(a + 1),
_get(a ));
}
static short getShortB(ByteBuffer bb, int bi) {
return makeShort(bb.get(bi ),
bb.get(bi + 1));
}
static short getShortB(long a) {
return makeShort(_get(a ),
_get(a + 1));
}
static short getShort(ByteBuffer bb, int bi, boolean bigEndian) {
return bigEndian ? getShortB(bb, bi) : getShortL(bb, bi);
}
static short getShort(long a, boolean bigEndian) {
return bigEndian ? getShortB(a) : getShortL(a);
}
private static byte short1(short x) { return (byte)(x >> 8); }
private static byte short0(short x) { return (byte)(x ); }
static void putShortL(ByteBuffer bb, int bi, short x) {
bb.put(bi , short0(x));
bb.put(bi + 1, short1(x));
}
static void putShortL(long a, short x) {
_put(a , short0(x));
_put(a + 1, short1(x));
}
static void putShortB(ByteBuffer bb, int bi, short x) {
bb.put(bi , short1(x));
bb.put(bi + 1, short0(x));
}
static void putShortB(long a, short x) {
_put(a , short1(x));
_put(a + 1, short0(x));
}
static void putShort(ByteBuffer bb, int bi, short x, boolean bigEndian) {
if (bigEndian)
putShortB(bb, bi, x);
else
putShortL(bb, bi, x);
}
static void putShort(long a, short x, boolean bigEndian) {
if (bigEndian)
putShortB(a, x);
else
putShortL(a, x);
}
// -- get/put int --
static private int makeInt(byte b3, byte b2, byte b1, byte b0) {
return (((b3 ) << 24) |
((b2 & 0xff) << 16) |
((b1 & 0xff) << 8) |
((b0 & 0xff) ));
}
static int getIntL(ByteBuffer bb, int bi) {
return makeInt(bb.get(bi + 3),
bb.get(bi + 2),
bb.get(bi + 1),
bb.get(bi ));
}
static int getIntL(long a) {
return makeInt(_get(a + 3),
_get(a + 2),
_get(a + 1),
_get(a ));
}
static int getIntB(ByteBuffer bb, int bi) {
return makeInt(bb.get(bi ),
bb.get(bi + 1),
bb.get(bi + 2),
bb.get(bi + 3));
}
static int getIntB(long a) {
return makeInt(_get(a ),
_get(a + 1),
_get(a + 2),
_get(a + 3));
}
static int getInt(ByteBuffer bb, int bi, boolean bigEndian) {
return bigEndian ? getIntB(bb, bi) : getIntL(bb, bi) ;
}
static int getInt(long a, boolean bigEndian) {
return bigEndian ? getIntB(a) : getIntL(a) ;
}
private static byte int3(int x) { return (byte)(x >> 24); }
private static byte int2(int x) { return (byte)(x >> 16); }
private static byte int1(int x) { return (byte)(x >> 8); }
private static byte int0(int x) { return (byte)(x ); }
static void putIntL(ByteBuffer bb, int bi, int x) {
bb.put(bi + 3, int3(x));
bb.put(bi + 2, int2(x));
bb.put(bi + 1, int1(x));
bb.put(bi , int0(x));
}
static void putIntL(long a, int x) {
_put(a + 3, int3(x));
_put(a + 2, int2(x));
_put(a + 1, int1(x));
_put(a , int0(x));
}
static void putIntB(ByteBuffer bb, int bi, int x) {
bb.put(bi , int3(x));
bb.put(bi + 1, int2(x));
bb.put(bi + 2, int1(x));
bb.put(bi + 3, int0(x));
}
static void putIntB(long a, int x) {
_put(a , int3(x));
_put(a + 1, int2(x));
_put(a + 2, int1(x));
_put(a + 3, int0(x));
}
static void putInt(ByteBuffer bb, int bi, int x, boolean bigEndian) {
if (bigEndian)
putIntB(bb, bi, x);
else
putIntL(bb, bi, x);
}
static void putInt(long a, int x, boolean bigEndian) {
if (bigEndian)
putIntB(a, x);
else
putIntL(a, x);
}
// -- get/put long --
static private long makeLong(byte b7, byte b6, byte b5, byte b4,
byte b3, byte b2, byte b1, byte b0)
{
return ((((long)b7 ) << 56) |
(((long)b6 & 0xff) << 48) |
(((long)b5 & 0xff) << 40) |
(((long)b4 & 0xff) << 32) |
(((long)b3 & 0xff) << 24) |
(((long)b2 & 0xff) << 16) |
(((long)b1 & 0xff) << 8) |
(((long)b0 & 0xff) ));
}
static long getLongL(ByteBuffer bb, int bi) {
return makeLong(bb.get(bi + 7),
bb.get(bi + 6),
bb.get(bi + 5),
bb.get(bi + 4),
bb.get(bi + 3),
bb.get(bi + 2),
bb.get(bi + 1),
bb.get(bi ));
}
static long getLongL(long a) {
return makeLong(_get(a + 7),
_get(a + 6),
_get(a + 5),
_get(a + 4),
_get(a + 3),
_get(a + 2),
_get(a + 1),
_get(a ));
}
static long getLongB(ByteBuffer bb, int bi) {
return makeLong(bb.get(bi ),
bb.get(bi + 1),
bb.get(bi + 2),
bb.get(bi + 3),
bb.get(bi + 4),
bb.get(bi + 5),
bb.get(bi + 6),
bb.get(bi + 7));
}
static long getLongB(long a) {
return makeLong(_get(a ),
_get(a + 1),
_get(a + 2),
_get(a + 3),
_get(a + 4),
_get(a + 5),
_get(a + 6),
_get(a + 7));
}
static long getLong(ByteBuffer bb, int bi, boolean bigEndian) {
return bigEndian ? getLongB(bb, bi) : getLongL(bb, bi);
}
static long getLong(long a, boolean bigEndian) {
return bigEndian ? getLongB(a) : getLongL(a);
}
private static byte long7(long x) { return (byte)(x >> 56); }
private static byte long6(long x) { return (byte)(x >> 48); }
private static byte long5(long x) { return (byte)(x >> 40); }
private static byte long4(long x) { return (byte)(x >> 32); }
private static byte long3(long x) { return (byte)(x >> 24); }
private static byte long2(long x) { return (byte)(x >> 16); }
private static byte long1(long x) { return (byte)(x >> 8); }
private static byte long0(long x) { return (byte)(x ); }
static void putLongL(ByteBuffer bb, int bi, long x) {
bb.put(bi + 7, long7(x));
bb.put(bi + 6, long6(x));
bb.put(bi + 5, long5(x));
bb.put(bi + 4, long4(x));
bb.put(bi + 3, long3(x));
bb.put(bi + 2, long2(x));
bb.put(bi + 1, long1(x));
bb.put(bi , long0(x));
}
static void putLongL(long a, long x) {
_put(a + 7, long7(x));
_put(a + 6, long6(x));
_put(a + 5, long5(x));
_put(a + 4, long4(x));
_put(a + 3, long3(x));
_put(a + 2, long2(x));
_put(a + 1, long1(x));
_put(a , long0(x));
}
static void putLongB(ByteBuffer bb, int bi, long x) {
bb.put(bi , long7(x));
bb.put(bi + 1, long6(x));
bb.put(bi + 2, long5(x));
bb.put(bi + 3, long4(x));
bb.put(bi + 4, long3(x));
bb.put(bi + 5, long2(x));
bb.put(bi + 6, long1(x));
bb.put(bi + 7, long0(x));
}
static void putLongB(long a, long x) {
_put(a , long7(x));
_put(a + 1, long6(x));
_put(a + 2, long5(x));
_put(a + 3, long4(x));
_put(a + 4, long3(x));
_put(a + 5, long2(x));
_put(a + 6, long1(x));
_put(a + 7, long0(x));
}
static void putLong(ByteBuffer bb, int bi, long x, boolean bigEndian) {
if (bigEndian)
putLongB(bb, bi, x);
else
putLongL(bb, bi, x);
}
static void putLong(long a, long x, boolean bigEndian) {
if (bigEndian)
putLongB(a, x);
else
putLongL(a, x);
}
// -- get/put float --
static float getFloatL(long a) {
return _getFloat(a);
}
static float getFloatB(long a) {
return _getFloat(a);
}
static float getFloat(long a, boolean bigEndian) {
return bigEndian ? getFloatB(a) : getFloatL(a);
}
static void putFloatL(long a, float x) {
_putFloat(a, Float.valueOf(x));
}
static void putFloatB(long a, float x) {
_putFloat(a, Float.valueOf(x));
}
static void putFloat(long a, float x, boolean bigEndian) {
if (bigEndian)
putFloatB(a, x);
else
putFloatL(a, x);
}
// -- get/put double --
static double getDoubleL(long a) {
return _getDouble(a);
}
static double getDoubleB(long a) {
return _getDouble(a);
}
static double getDouble(long a, boolean bigEndian) {
return bigEndian ? getDoubleB(a) : getDoubleL(a);
}
static void putDoubleL(long a, double x) {
_putDouble(a, Double.valueOf(x));
}
static void putDoubleB(long a, double x) {
_putDouble(a, Double.valueOf(x));
}
static void putDouble(long a, double x, boolean bigEndian) {
if (bigEndian)
putDoubleB(a, x);
else
putDoubleL(a, x);
}
// -- Unsafe access --
private static final List unsafe = new ArrayList<>(16);
private static byte _get(long a) {
return unsafe.get((int) a).byteValue();
}
private static void _put(long a, byte b) {
while (unsafe.size() < a) {
unsafe.add(Byte.valueOf("0"));
}
unsafe.set((int) a, Byte.valueOf(b));
}
// -- Unsafe access --
private static final List unsafeDouble = new ArrayList<>(16);
private static Double _getDouble(long a) {
return unsafeDouble.get((int) a);
}
private static void _putDouble(long a, Double b) {
while (unsafeDouble.size() < a) {
unsafeDouble.add(Double.NaN);
}
unsafeDouble.set((int) a, b);
}
// -- Unsafe access --
private static final List unsafeFloat = new ArrayList<>(16);
private static Float _getFloat(long a) {
return unsafeFloat.get((int) a);
}
private static void _putFloat(long a, Float b) {
while (unsafeFloat.size() < a) {
unsafeFloat.add(Float.NaN);
}
unsafeFloat.set((int) a, b);
}
}
