io.vertx.mssqlclient.impl.codec.TdsPacketDecoder Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2021 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
* which is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
*/
package io.vertx.mssqlclient.impl.codec;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import static io.vertx.mssqlclient.MSSQLConnectOptions.MAX_PACKET_SIZE;
import static io.vertx.mssqlclient.impl.codec.TdsPacket.PACKET_HEADER_SIZE;
public class TdsPacketDecoder extends LengthFieldBasedFrameDecoder {
public TdsPacketDecoder() {
super(MAX_PACKET_SIZE, 2, 2, -4, 0);
}
@Override
protected TdsPacket decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
ByteBuf byteBuf = (ByteBuf) super.decode(ctx, in);
if (byteBuf == null) {
return null;
}
short type = byteBuf.getUnsignedByte(0);
short status = byteBuf.getUnsignedByte(1);
int length = byteBuf.getUnsignedShort(2);
byteBuf.skipBytes(PACKET_HEADER_SIZE);
return new TdsPacket(type, status, length, byteBuf);
}
}