com.mysql.cj.protocol.a.NativePacketHeader Maven / Gradle / Ivy
/*
* Copyright (c) 2016, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.protocol.a;
import java.nio.ByteBuffer;
import com.mysql.cj.protocol.MessageHeader;
/**
* Represents the legacy protocol packet header, consisting of
* 3-bytes payload_length and 1-byte sequence_id.
*
* see http://dev.mysql.com/doc/internals/en/mysql-packet.html
*/
public class NativePacketHeader implements MessageHeader {
protected ByteBuffer packetHeaderBuf;
public NativePacketHeader() {
this.packetHeaderBuf = ByteBuffer.allocate(4);
}
public NativePacketHeader(byte[] buf) {
this.packetHeaderBuf = ByteBuffer.wrap(buf);
}
public ByteBuffer getBuffer() {
return this.packetHeaderBuf;
}
@Override
public int getMessageSize() {
return (this.packetHeaderBuf.array()[0] & 0xff) + ((this.packetHeaderBuf.array()[1] & 0xff) << 8) + ((this.packetHeaderBuf.array()[2] & 0xff) << 16);
}
@Override
public byte getMessageSequence() {
return this.packetHeaderBuf.array()[3];
}
}