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/*
* 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.
*/
package fs2.protocols
package pcapng
import cats.effect.MonadCancelThrow
import fs2.interop.scodec.StreamDecoder
import fs2.protocols.pcap.LinkType
import fs2.timeseries.TimeStamped
import fs2.{Pipe, Pull, Stream}
import scodec.bits.ByteVector
object CaptureFile {
val streamDecoder: StreamDecoder[BodyBlock] =
StreamDecoder.once(SectionHeaderBlock.codec).flatMap { shb =>
StreamDecoder.many(BodyBlock.decoder(shb.ordering))
}
def parse[F[_]: MonadCancelThrow, A](
f: (LinkType, ByteVector) => Option[A]
): Pipe[F, Byte, TimeStamped[A]] = { bytes =>
def go(
idbs: Vector[InterfaceDescriptionBlock],
blocks: Stream[F, BodyBlock]
): Pull[F, TimeStamped[A], Unit] =
blocks.pull.uncons1.flatMap {
case Some((idb: InterfaceDescriptionBlock, tail)) =>
go(idbs :+ idb, tail)
case Some((epb: EnhancedPacketBlock, tail)) =>
val idb = idbs(epb.interfaceId.toInt)
val ts = idb.if_tsresol * ((epb.timestampHigh << 32) | epb.timestampLow)
val timeStamped = f(idb.linkType, epb.packetData).map(TimeStamped(ts, _))
Pull.outputOption1(timeStamped) >> go(idbs, tail)
case Some((_, tail)) => go(idbs, tail)
case None => Pull.done
}
val blocks = bytes.through(streamDecoder.toPipeByte)
blocks.through(go(Vector.empty, _).stream)
}
}
