d9a6cf341c
Motivation: ByteBuf supports “marker indexes”. The intended use case for these is if a speculative operation (e.g. decode) is in process the user can “mark” and interface and refer to it later if the operation isn’t successful (e.g. not enough data). However this is rarely used in practice, requires extra memory to maintain, and introduces complexity in the state management for derived/pooled buffer initialization, resizing, and other operations which may modify reader/writer indexes. Modifications: Remove support for marking and adjust testcases / code. Result: Fixes https://github.com/netty/netty/issues/8535.
64 lines
2.1 KiB
Java
64 lines
2.1 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.example.factorial;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.ByteToMessageDecoder;
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import io.netty.handler.codec.CorruptedFrameException;
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import java.math.BigInteger;
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import java.util.List;
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/**
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* Decodes the binary representation of a {@link BigInteger} prepended
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* with a magic number ('F' or 0x46) and a 32-bit integer length prefix into a
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* {@link BigInteger} instance. For example, { 'F', 0, 0, 0, 1, 42 } will be
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* decoded into new BigInteger("42").
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*/
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public class BigIntegerDecoder extends ByteToMessageDecoder {
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
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// Wait until the length prefix is available.
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if (in.readableBytes() < 5) {
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return;
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}
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int readerIndex = in.readerIndex();
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// Check the magic number.
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int magicNumber = in.readUnsignedByte();
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if (magicNumber != 'F') {
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in.readerIndex(readerIndex);
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throw new CorruptedFrameException("Invalid magic number: " + magicNumber);
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}
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// Wait until the whole data is available.
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int dataLength = in.readInt();
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if (in.readableBytes() < dataLength) {
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in.readerIndex(readerIndex);
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return;
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}
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// Convert the received data into a new BigInteger.
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byte[] decoded = new byte[dataLength];
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in.readBytes(decoded);
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out.add(new BigInteger(decoded));
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}
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}
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