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The Qbicc builder for the java.base JDK module
/*
* Copyright (c) 2006, 2021, 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 sun.security.provider;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.nio.ByteOrder;
/**
* Optimized methods for converting between byte[] and int[]/long[], both for
* big endian and little endian byte orders.
*
* NOTE that ArrayIndexOutOfBoundsException will be thrown if the bounds checks
* failed.
*
* This class may also be helpful in improving the performance of the
* crypto code in the SunJCE provider. However, for now it is only accessible by
* the message digest implementation in the SUN provider.
*
* @since 1.6
* @author Andreas Sterbenz
*/
final class ByteArrayAccess {
private ByteArrayAccess() {
// empty
}
static final class LE {
static final VarHandle INT_ARRAY
= MethodHandles.byteArrayViewVarHandle(int[].class,
ByteOrder.LITTLE_ENDIAN).withInvokeExactBehavior();
static final VarHandle LONG_ARRAY
= MethodHandles.byteArrayViewVarHandle(long[].class,
ByteOrder.LITTLE_ENDIAN).withInvokeExactBehavior();
}
static final class BE {
static final VarHandle INT_ARRAY
= MethodHandles.byteArrayViewVarHandle(int[].class,
ByteOrder.BIG_ENDIAN).withInvokeExactBehavior();
static final VarHandle LONG_ARRAY
= MethodHandles.byteArrayViewVarHandle(long[].class,
ByteOrder.BIG_ENDIAN).withInvokeExactBehavior();
}
/**
* int[] to byte[] conversion, little endian byte order.
*/
static void i2bLittle(int[] in, int inOfs, byte[] out, int outOfs, int len) {
len += outOfs;
while (outOfs < len) {
LE.INT_ARRAY.set(out, outOfs, in[inOfs++]);
outOfs += 4;
}
}
// Store one 32-bit value into out[outOfs..outOfs+3] in little endian order.
static void i2bLittle4(int val, byte[] out, int outOfs) {
LE.INT_ARRAY.set(out, outOfs, val);
}
/**
* byte[] to int[] conversion, big endian byte order.
*/
static void b2iBig(byte[] in, int inOfs, int[] out, int outOfs, int len) {
len += inOfs;
while (inOfs < len) {
out[outOfs++] = (int) BE.INT_ARRAY.get(in, inOfs);
inOfs += 4;
}
}
// Special optimization of b2iBig(in, inOfs, out, 0, 64)
static void b2iBig64(byte[] in, int inOfs, int[] out) {
out[ 0] = (int) BE.INT_ARRAY.get(in, inOfs );
out[ 1] = (int) BE.INT_ARRAY.get(in, inOfs + 4);
out[ 2] = (int) BE.INT_ARRAY.get(in, inOfs + 8);
out[ 3] = (int) BE.INT_ARRAY.get(in, inOfs + 12);
out[ 4] = (int) BE.INT_ARRAY.get(in, inOfs + 16);
out[ 5] = (int) BE.INT_ARRAY.get(in, inOfs + 20);
out[ 6] = (int) BE.INT_ARRAY.get(in, inOfs + 24);
out[ 7] = (int) BE.INT_ARRAY.get(in, inOfs + 28);
out[ 8] = (int) BE.INT_ARRAY.get(in, inOfs + 32);
out[ 9] = (int) BE.INT_ARRAY.get(in, inOfs + 36);
out[10] = (int) BE.INT_ARRAY.get(in, inOfs + 40);
out[11] = (int) BE.INT_ARRAY.get(in, inOfs + 44);
out[12] = (int) BE.INT_ARRAY.get(in, inOfs + 48);
out[13] = (int) BE.INT_ARRAY.get(in, inOfs + 52);
out[14] = (int) BE.INT_ARRAY.get(in, inOfs + 56);
out[15] = (int) BE.INT_ARRAY.get(in, inOfs + 60);
}
/**
* int[] to byte[] conversion, big endian byte order.
*/
static void i2bBig(int[] in, int inOfs, byte[] out, int outOfs, int len) {
len += outOfs;
while (outOfs < len) {
BE.INT_ARRAY.set(out, outOfs, in[inOfs++]);
outOfs += 4;
}
}
// Store one 32-bit value into out[outOfs..outOfs+3] in big endian order.
static void i2bBig4(int val, byte[] out, int outOfs) {
BE.INT_ARRAY.set(out, outOfs, val);
}
/**
* byte[] to long[] conversion, big endian byte order.
*/
static void b2lBig(byte[] in, int inOfs, long[] out, int outOfs, int len) {
len += inOfs;
while (inOfs < len) {
out[outOfs++] = (long) BE.LONG_ARRAY.get(in, inOfs);
inOfs += 8;
}
}
// Special optimization of b2lBig(in, inOfs, out, 0, 128)
static void b2lBig128(byte[] in, int inOfs, long[] out) {
out[ 0] = (long) BE.LONG_ARRAY.get(in, inOfs );
out[ 1] = (long) BE.LONG_ARRAY.get(in, inOfs + 8);
out[ 2] = (long) BE.LONG_ARRAY.get(in, inOfs + 16);
out[ 3] = (long) BE.LONG_ARRAY.get(in, inOfs + 24);
out[ 4] = (long) BE.LONG_ARRAY.get(in, inOfs + 32);
out[ 5] = (long) BE.LONG_ARRAY.get(in, inOfs + 40);
out[ 6] = (long) BE.LONG_ARRAY.get(in, inOfs + 48);
out[ 7] = (long) BE.LONG_ARRAY.get(in, inOfs + 56);
out[ 8] = (long) BE.LONG_ARRAY.get(in, inOfs + 64);
out[ 9] = (long) BE.LONG_ARRAY.get(in, inOfs + 72);
out[10] = (long) BE.LONG_ARRAY.get(in, inOfs + 80);
out[11] = (long) BE.LONG_ARRAY.get(in, inOfs + 88);
out[12] = (long) BE.LONG_ARRAY.get(in, inOfs + 96);
out[13] = (long) BE.LONG_ARRAY.get(in, inOfs + 104);
out[14] = (long) BE.LONG_ARRAY.get(in, inOfs + 112);
out[15] = (long) BE.LONG_ARRAY.get(in, inOfs + 120);
}
/**
* long[] to byte[] conversion, big endian byte order.
*/
static void l2bBig(long[] in, int inOfs, byte[] out, int outOfs, int len) {
len += outOfs;
while (outOfs < len) {
BE.LONG_ARRAY.set(out, outOfs, in[inOfs++]);
outOfs += 8;
}
}
/**
* byte[] to long[] conversion, little endian byte order
*/
static void b2lLittle(byte[] in, int inOfs, long[] out, int outOfs, int len) {
len += inOfs;
while (inOfs < len) {
out[outOfs++] = (long) LE.LONG_ARRAY.get(in, inOfs);
inOfs += 8;
}
}
/**
* long[] to byte[] conversion, little endian byte order
*/
static void l2bLittle(long[] in, int inOfs, byte[] out, int outOfs, int len) {
len += outOfs;
while (outOfs < len) {
LE.LONG_ARRAY.set(out, outOfs, in[inOfs++]);
outOfs += 8;
}
}
}
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