85 lines
3.3 KiB
Java
85 lines
3.3 KiB
Java
/*
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* Copyright 2021 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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* https://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.util.internal.PlatformDependent;
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import io.netty.util.internal.SuppressJava6Requirement;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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import java.nio.ByteBuffer;
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import java.util.zip.Inflater;
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@SuppressJava6Requirement(reason = "Guarded by version check")
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final class Java11ZlibUtils {
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private static final InternalLogger LOGGER = InternalLoggerFactory.getInstance(Java11ZlibUtils.class);
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private static final MethodHandle INFLATER_SET_INPUT;
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private static final MethodHandle INFLATER_INFLATE;
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static {
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MethodHandle inflaterSetInput = null;
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MethodHandle inflaterInflate = null;
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if (PlatformDependent.javaVersion() >= 11) {
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try {
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inflaterSetInput = MethodHandles.lookup().findVirtual(Inflater.class, "setInput",
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MethodType.methodType(void.class, ByteBuffer.class));
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inflaterInflate = MethodHandles.lookup().findVirtual(Inflater.class, "inflate",
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MethodType.methodType(int.class, ByteBuffer.class));
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} catch (NoSuchMethodException e) {
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LOGGER.debug("Couldn't find required methods on Inflater, falling-back to < Java11 methods", e);
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inflaterSetInput = null;
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inflaterInflate = null;
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} catch (IllegalAccessException e) {
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LOGGER.debug("Couldn't access required methods on Inflater, falling-back to < Java11 methods", e);
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inflaterSetInput = null;
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inflaterInflate = null;
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}
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}
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INFLATER_SET_INPUT = inflaterSetInput;
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INFLATER_INFLATE = inflaterInflate;
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}
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static boolean isSupported() {
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return INFLATER_SET_INPUT != null && INFLATER_INFLATE != null;
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}
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static void setInput(Inflater inflater, ByteBuffer input) {
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try {
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// Use invokeWithArguments as we compile with -target 6
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INFLATER_SET_INPUT.invokeWithArguments(inflater, input);
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} catch (Throwable cause) {
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PlatformDependent.throwException(cause);
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}
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}
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static int inflate(Inflater inflater, ByteBuffer input) {
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try {
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// Use invokeWithArguments as we compile with -target 6
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return (Integer) INFLATER_INFLATE.invokeWithArguments(inflater, input);
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} catch (Throwable cause) {
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PlatformDependent.throwException(cause);
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}
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return -1;
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}
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private Java11ZlibUtils() { }
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}
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