2016-07-12 13:25:13 +02:00
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/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.compression;
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import io.netty.buffer.ByteBuf;
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2016-07-19 14:21:47 +02:00
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import io.netty.util.ByteProcessor;
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2016-07-12 13:25:13 +02:00
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import io.netty.util.internal.ObjectUtil;
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import java.lang.reflect.Method;
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import java.nio.ByteBuffer;
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import java.util.zip.Adler32;
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import java.util.zip.CRC32;
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import java.util.zip.Checksum;
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/**
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* {@link Checksum} implementation which can directly act on a {@link ByteBuf}.
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*
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* Implementations may optimize access patterns depending on if the {@link ByteBuf} is backed by a
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* byte array ({@link ByteBuf#hasArray()} is {@code true}) or not.
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*/
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abstract class ByteBufChecksum implements Checksum {
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private static final Method ADLER32_UPDATE_METHOD;
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private static final Method CRC32_UPDATE_METHOD;
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static {
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// See if we can use fast-path when using ByteBuf that is not heap based as Adler32 and CRC32 added support
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// for update(ByteBuffer) in JDK8.
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ADLER32_UPDATE_METHOD = updateByteBuffer(new Adler32());
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CRC32_UPDATE_METHOD = updateByteBuffer(new CRC32());
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}
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2019-01-29 14:06:05 +01:00
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private final ByteProcessor updateProcessor = value -> {
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update(value);
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return true;
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2016-07-19 14:21:47 +02:00
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};
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2016-07-12 13:25:13 +02:00
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private static Method updateByteBuffer(Checksum checksum) {
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2019-01-25 08:57:11 +01:00
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try {
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Method method = checksum.getClass().getDeclaredMethod("update", ByteBuffer.class);
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method.invoke(method, ByteBuffer.allocate(1));
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return method;
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} catch (Throwable ignore) {
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return null;
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2016-07-12 13:25:13 +02:00
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}
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}
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static ByteBufChecksum wrapChecksum(Checksum checksum) {
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ObjectUtil.checkNotNull(checksum, "checksum");
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if (checksum instanceof Adler32 && ADLER32_UPDATE_METHOD != null) {
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return new ReflectiveByteBufChecksum(checksum, ADLER32_UPDATE_METHOD);
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}
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if (checksum instanceof CRC32 && CRC32_UPDATE_METHOD != null) {
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return new ReflectiveByteBufChecksum(checksum, CRC32_UPDATE_METHOD);
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}
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return new SlowByteBufChecksum(checksum);
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}
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2016-07-19 14:21:47 +02:00
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/**
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2017-02-21 21:27:23 +01:00
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* @see #update(byte[], int, int)
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2016-07-19 14:21:47 +02:00
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*/
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public void update(ByteBuf b, int off, int len) {
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if (b.hasArray()) {
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update(b.array(), b.arrayOffset() + off, len);
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} else {
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b.forEachByte(off, len, updateProcessor);
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}
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}
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private static final class ReflectiveByteBufChecksum extends SlowByteBufChecksum {
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2016-07-12 13:25:13 +02:00
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private final Method method;
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ReflectiveByteBufChecksum(Checksum checksum, Method method) {
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super(checksum);
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this.method = method;
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}
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@Override
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2016-07-19 14:21:47 +02:00
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public void update(ByteBuf b, int off, int len) {
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2016-07-12 13:25:13 +02:00
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if (b.hasArray()) {
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update(b.array(), b.arrayOffset() + off, len);
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} else {
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try {
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method.invoke(checksum, CompressionUtil.safeNioBuffer(b));
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} catch (Throwable cause) {
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throw new Error();
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}
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}
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}
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}
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2016-07-19 14:21:47 +02:00
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private static class SlowByteBufChecksum extends ByteBufChecksum {
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protected final Checksum checksum;
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2016-07-12 13:25:13 +02:00
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SlowByteBufChecksum(Checksum checksum) {
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2016-07-19 14:21:47 +02:00
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this.checksum = checksum;
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2016-07-12 13:25:13 +02:00
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}
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@Override
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2016-07-19 14:21:47 +02:00
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public void update(int b) {
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checksum.update(b);
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}
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@Override
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public void update(byte[] b, int off, int len) {
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checksum.update(b, off, len);
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}
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@Override
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public long getValue() {
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return checksum.getValue();
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2016-07-12 13:25:13 +02:00
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}
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@Override
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2016-07-19 14:21:47 +02:00
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public void reset() {
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checksum.reset();
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2016-07-12 13:25:13 +02:00
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}
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}
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}
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