fs2.protocols.ip.tcp.TcpHeader.scala Maven / Gradle / Ivy
/*
* Copyright (c) 2013 Functional Streams for Scala
*
* 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.
*/
// Adapted from scodec-protocols, licensed under 3-clause BSD
package fs2.protocols
package ip
package tcp
import scodec.Codec
import scodec.codecs._
import fs2.interop.scodec._
import com.comcast.ip4s.Port
case class TcpHeader(
sourcePort: Port,
destinationPort: Port,
sequenceNumber: Long,
ackNumber: Long,
dataOffset: Int,
flags: TcpFlags,
windowSize: Int,
checksum: Int,
urgentPointer: Int,
options: List[Long]
)
object TcpHeader {
// format: off
implicit val codec: Codec[TcpHeader] = {
("src_port" | Ip4sCodecs.port) ::
("dst_port" | Ip4sCodecs.port) ::
("seqno" | uint32) ::
("ackno" | uint32) ::
("data_offset" | uint4).flatPrepend(headerWords =>
("reserved" | ignore(4)) ::
("flags" | Codec[TcpFlags]) ::
("window_size" | uint16) ::
("checksum" | uint16) ::
("urgent_ptr" | uint16) ::
("options" | listOfN(provide(headerWords - 5), uint32)))
}.as[TcpHeader]
// format: on
def sdecoder(protocol: Int): StreamDecoder[TcpHeader] =
if (protocol == 6) StreamDecoder.once(codec)
else StreamDecoder.empty
}