ZstdDecoder.java — netty Source File

Source Code

/*
 * Copyright 2024 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.codec.compression;

import com.github.luben.zstd.ZstdIOException;
import com.github.luben.zstd.ZstdInputStreamNoFinalizer;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import io.netty.util.internal.ObjectUtil;

import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

/**
 * Decompresses a compressed block {@link ByteBuf} using the Zstandard algorithm.
 * See <a href="https://facebook.github.io/zstd">Zstandard</a>.
 */
public final class ZstdDecoder extends ByteToMessageDecoder {
    // Don't use static here as we want to still allow to load the classes.
    {
        try {
            Zstd.ensureAvailability();
        } catch (Throwable throwable) {
            throw new ExceptionInInitializerError(throwable);
        }
    }

    private final int maximumAllocationSize;
    private final MutableByteBufInputStream inputStream = new MutableByteBufInputStream();
    private ZstdInputStreamNoFinalizer zstdIs;

    private boolean needsRead;
    private State currentState = State.DECOMPRESS_DATA;

    /**
     * Current state of stream.
     */
    private enum State {
        DECOMPRESS_DATA,
        CORRUPTED
    }

    public ZstdDecoder() {
        this(4 * 1024 * 1024);
// ... (130 more lines)