42c65cca3a
- Move common methods from ByteBuf to Buf - Rename ensureWritableBytes() to ensureWritable() - Rename readable() to isReadable() - Rename writable() to isWritable() - Add isReadable(int) and isWritable(int) - Add AbstractMessageBuf - Rewrite DefaultMessageBuf and QueueBackedMessageBuf - based on Josh Bloch's public domain ArrayDeque impl
64 lines
2.2 KiB
Java
64 lines
2.2 KiB
Java
/*
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* Copyright 2012 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.protobuf;
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import com.google.protobuf.CodedOutputStream;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufOutputStream;
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import io.netty.channel.ChannelHandler.Sharable;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToByteEncoder;
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/**
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* An encoder that prepends the the Google Protocol Buffers
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* <a href="http://code.google.com/apis/protocolbuffers/docs/encoding.html#varints">Base
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* 128 Varints</a> integer length field. For example:
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* <pre>
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* BEFORE DECODE (300 bytes) AFTER DECODE (302 bytes)
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* +---------------+ +--------+---------------+
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* | Protobuf Data |-------------->| Length | Protobuf Data |
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* | (300 bytes) | | 0xAC02 | (300 bytes) |
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* +---------------+ +--------+---------------+
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* </pre> *
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*
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* @see CodedOutputStream
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*/
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@Sharable
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public class ProtobufVarint32LengthFieldPrepender extends MessageToByteEncoder<ByteBuf> {
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/**
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* Creates a new instance.
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*/
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public ProtobufVarint32LengthFieldPrepender() {
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super(ByteBuf.class);
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}
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@Override
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protected void encode(
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ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out) throws Exception {
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int bodyLen = msg.readableBytes();
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int headerLen = CodedOutputStream.computeRawVarint32Size(bodyLen);
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out.ensureWritable(headerLen + bodyLen);
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CodedOutputStream headerOut =
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CodedOutputStream.newInstance(new ByteBufOutputStream(out));
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headerOut.writeRawVarint32(bodyLen);
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headerOut.flush();
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out.writeBytes(msg, msg.readerIndex(), bodyLen);
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}
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}
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