fef761d03e
Motivation: Currently, Netty only has BrotliDecoder which can decode Brotli encoded data. However, BrotliEncoder is missing which will encode normal data to Brotli encoded data. Modification: Added BrotliEncoder and CompressionOption Result: Fixes #6899. Co-authored-by: Norman Maurer <norman_maurer@apple.com>
93 lines
3.1 KiB
Java
93 lines
3.1 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 com.aayushatharva.brotli4j.encoder.Encoder;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufUtil;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToByteEncoder;
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import io.netty.util.ReferenceCountUtil;
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import io.netty.util.internal.ObjectUtil;
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/**
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* Compress a {@link ByteBuf} with the brotli format.
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*
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* See <a href="https://github.com/google/brotli">brotli</a>.
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*/
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@ChannelHandler.Sharable
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public final class BrotliEncoder extends MessageToByteEncoder<ByteBuf> {
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private final Encoder.Parameters parameters;
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/**
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* Create a new {@link BrotliEncoder} Instance
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* with {@link Encoder.Parameters#setQuality(int)} set to 4
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* and {@link Encoder.Parameters#setMode(Encoder.Mode)} set to {@link Encoder.Mode#TEXT}
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*/
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public BrotliEncoder() {
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this(BrotliOptions.DEFAULT);
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}
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/**
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* Create a new {@link BrotliEncoder} Instance
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*
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* @param parameters {@link Encoder.Parameters} Instance
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*/
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public BrotliEncoder(Encoder.Parameters parameters) {
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this.parameters = ObjectUtil.checkNotNull(parameters, "Parameters");
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}
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/**
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* Create a new {@link BrotliEncoder} Instance
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*
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* @param brotliOptions {@link BrotliOptions} to use.
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*/
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public BrotliEncoder(BrotliOptions brotliOptions) {
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this(brotliOptions.parameters());
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}
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@Override
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protected void encode(ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out) throws Exception {
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// NO-OP
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}
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@Override
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protected ByteBuf allocateBuffer(ChannelHandlerContext ctx, ByteBuf msg, boolean preferDirect) throws Exception {
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// If ByteBuf is unreadable, then return EMPTY_BUFFER.
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if (!msg.isReadable()) {
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return Unpooled.EMPTY_BUFFER;
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}
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try {
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byte[] uncompressed = ByteBufUtil.getBytes(msg, msg.readerIndex(), msg.readableBytes(), false);
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byte[] compressed = Encoder.compress(uncompressed, parameters);
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if (preferDirect) {
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ByteBuf out = ctx.alloc().ioBuffer(compressed.length);
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out.writeBytes(compressed);
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return out;
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} else {
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return Unpooled.wrappedBuffer(compressed);
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}
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} catch (Exception e) {
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ReferenceCountUtil.release(msg);
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throw e;
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}
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}
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}
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