56 lines
1.8 KiB
Java
56 lines
1.8 KiB
Java
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/*
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* Copyright (C) 2008 Trustin Heuiseung Lee
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA
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*/
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package net.gleamynode.netty.example.factorial;
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import java.math.BigInteger;
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import net.gleamynode.netty.buffer.ChannelBuffer;
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import net.gleamynode.netty.channel.Channel;
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import net.gleamynode.netty.channel.ChannelHandlerContext;
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import net.gleamynode.netty.handler.codec.frame.FrameDecoder;
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/**
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* @author The Netty Project (netty@googlegroups.com)
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* @author Trustin Lee (trustin@gmail.com)
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*
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* @version $Rev$, $Date$
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*
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*/
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public class BigIntegerDecoder extends FrameDecoder {
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@Override
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protected Object decode(
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ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception {
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if (buffer.readableBytes() < 4) {
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return null;
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}
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int dataLength = buffer.getInt(buffer.readerIndex());
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if (buffer.readableBytes() < dataLength + 4) {
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return null;
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}
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buffer.skipBytes(4);
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byte[] decoded = new byte[dataLength];
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buffer.readBytes(decoded);
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return new BigInteger(decoded);
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}
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}
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