fs2.protocols.pcapng.EnhancedPacketBlock.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.
*/
package fs2.protocols
package pcapng
import pcap._
import scodec.Codec
import scodec.bits._
import scodec.codecs._
case class EnhancedPacketBlock(
length: Length,
interfaceId: Long,
timestampHigh: Long,
timestampLow: Long,
capturedPacketLength: Long,
originalPacketLength: Long,
packetData: ByteVector,
options: ByteVector
) extends BodyBlock
object EnhancedPacketBlock {
def codec(implicit ord: ByteOrdering): Codec[EnhancedPacketBlock] =
"EPB" | BlockCodec.byBlockBytesCodec(hexConstant, epbCodec).dropUnits.as[EnhancedPacketBlock]
private def hexConstant(implicit ord: ByteOrdering): ByteVector =
orderDependent(hex"00000006", hex"06000000")
private def epbCodec(implicit ord: ByteOrdering) =
// format: off
("Interface ID" | guint32 ) ::
("Timestamp (High)" | guint32 ) ::
("Timestamp (Low)" | guint32 ) ::
("Captured Packet Length" | guint32 ).flatPrepend { packetLength =>
("Original Packet Length" | guint32 ) ::
("Packet Data" | bytes(packetLength.toInt) ) ::
("Packet padding" | ignore(padTo32Bits(packetLength.toInt)) ) ::
("Options" | bytes )}
// format: on
private def padTo32Bits(length: Int): Long = {
val rem = length % 4
val bytes = if (rem == 0) 0 else 4 - rem
bytes.toLong * 8
}
}