/*
* This file is part of LanternServer, licensed under the MIT License (MIT).
*
* Copyright (c) LanternPowered <https://www.lanternpowered.org>
* Copyright (c) SpongePowered <https://www.spongepowered.org>
* Copyright (c) contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the Software), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* Copyright (c) 2011-2014 Glowstone - Tad Hardesty
* Copyright (c) 2010-2011 Lightstone - Graham Edgecombe
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.lanternpowered.server.network.pipeline;
import static org.lanternpowered.server.network.buffer.LanternByteBuffer.readVarInt;
import static org.lanternpowered.server.network.buffer.LanternByteBuffer.writeVarInt;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageCodec;
import java.util.List;
public final class MessageFramingHandler extends ByteToMessageCodec<ByteBuf> {
@Override
protected void encode(ChannelHandlerContext ctx, ByteBuf buf, ByteBuf output) throws Exception {
writeVarInt(output, buf.readableBytes());
output.writeBytes(buf);
}
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf buf, List<Object> output) throws Exception {
while (readableVarInt(buf)) {
buf.markReaderIndex();
final int length = readVarInt(buf);
if (buf.readableBytes() < length) {
buf.resetReaderIndex();
break;
}
final ByteBuf msg = ctx.alloc().buffer(length);
buf.readBytes(msg, length);
output.add(msg);
}
}
private static boolean readableVarInt(ByteBuf buf) {
if (buf.readableBytes() > 5) {
return true;
}
int idx = buf.readerIndex();
byte in;
do {
if (buf.readableBytes() < 1) {
buf.readerIndex(idx);
return false;
}
in = buf.readByte();
} while ((in & 0x80) != 0);
buf.readerIndex(idx);
return true;
}
}