Packet: HitHint (#107)

* initial HitHint packet and tests

* rebased and updated HitHint packet and tests

* field are known

common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala

@@ -330,7 +330,7 @@ object GamePacketOpcode extends Enumeration {
     // 0x08
     case 0x08 => game.PlayerStateMessage.decode
     case 0x09 => game.HitMessage.decode
-    case 0x0a => noDecoder(HitHint)
+    case 0x0a => game.HitHint.decode
     case 0x0b => noDecoder(DamageMessage)
     case 0x0c => noDecoder(DestroyMessage)
     case 0x0d => game.ReloadMessage.decode

common/src/main/scala/net/psforever/packet/game/HitHint.scala

@@ -0,0 +1,32 @@
+// Copyright (c) 2016 PSForever.net to present
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PlanetSideGamePacket}
+import scodec.Codec
+import scodec.codecs._
+
+/**
+  * Dispatched by the server to indicate a target or source of damage affecting the player.<br>
+  * <br>
+  * When a source is provided, and within render distance, the player will be shown a fading, outwards drifting, red tick mark.
+  * The location and movement of the mark will indicate a general direction towards the source.
+  * If the option `Game/Show Damage Flash` is set, the player's screen will flash red briefly when a mark is displayed.<br>
+  * <br>
+  * For while some mark is being displayed, the player will also make a grunt of pain.
+  * @param source_guid the source of implied damage
+  * @param player_guid the player
+  */
+final case class HitHint(source_guid : PlanetSideGUID,
+                         player_guid : PlanetSideGUID)
+  extends PlanetSideGamePacket {
+  type Packet = HitHint
+  def opcode = GamePacketOpcode.HitHint
+  def encode = HitHint.encode(this)
+}
+
+object HitHint extends Marshallable[HitHint] {
+  implicit val codec : Codec[HitHint] = (
+    ("source_guid" | PlanetSideGUID.codec) ::
+      ("player_guid" | PlanetSideGUID.codec)
+    ).as[HitHint]
+}

common/src/test/scala/game/HitHintTest.scala

@@ -0,0 +1,28 @@
+// Copyright (c) 2016 PSForever.net to present
+package game
+
+import org.specs2.mutable._
+import net.psforever.packet._
+import net.psforever.packet.game._
+import scodec.bits._
+
+class HitHintTest extends Specification {
+  val string = hex"0A 460B 0100"
+
+  "decode" in {
+    PacketCoding.DecodePacket(string).require match {
+      case HitHint(source, player) =>
+        source mustEqual PlanetSideGUID(2886)
+        player mustEqual PlanetSideGUID(1)
+      case _ =>
+        ko
+    }
+  }
+
+  "encode" in {
+    val msg = HitHint(PlanetSideGUID(2886), PlanetSideGUID(1))
+    val pkt = PacketCoding.EncodePacket(msg).require.toByteVector
+
+    pkt mustEqual string
+  }
+}