initial FriendsRequest packet and tests; must track how server responds for more applicable testing

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

@@ -454,7 +454,7 @@ object GamePacketOpcode extends Enumeration {
     // OPCODES 0x70-7f
     case 0x70 => noDecoder(SquadMemberEvent)
     case 0x71 => noDecoder(PlatoonEvent)
-    case 0x72 => noDecoder(FriendsRequest)
+    case 0x72 => game.FriendsRequest.decode
     case 0x73 => noDecoder(FriendsResponse)
     case 0x74 => noDecoder(TriggerEnvironmentalDamageMessage)
     case 0x75 => noDecoder(TrainingZoneMessage)

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

@@ -0,0 +1,22 @@
+// Copyright (c) 2016 PSForever.net to present
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PacketHelpers, PlanetSideGamePacket}
+import scodec.Codec
+import scodec.codecs._
+
+final case class FriendsRequest(unk : Int,
+                                friend : String)
+  extends PlanetSideGamePacket {
+  type Packet = FriendsRequest
+  def opcode = GamePacketOpcode.FriendsRequest
+  def encode = FriendsRequest.encode(this)
+}
+
+object FriendsRequest extends Marshallable[FriendsRequest] {
+  implicit val codec : Codec[FriendsRequest] = (
+    ("unk" | uintL(3)) ::
+      ("friend" | PacketHelpers.encodedWideStringAligned(5))
+    ).as[FriendsRequest]
+}
+

common/src/test/scala/GamePacketTest.scala

@@ -830,6 +830,28 @@ class GamePacketTest extends Specification {
       }
     }
 
+    "FriendsRequest" should {
+      val string = hex"72 3 0a0 46004a0048004e004300"
+
+      "decode" in {
+        PacketCoding.DecodePacket(string).require match {
+          case FriendsRequest(unk, friend) =>
+            unk mustEqual 1
+            friend.length mustEqual 5
+            friend mustEqual "FJHNC"
+          case default =>
+            ko
+        }
+      }
+
+      "encode" in {
+        val msg = FriendsRequest(1, "FJHNC")
+        val pkt = PacketCoding.EncodePacket(msg).require.toByteVector
+
+        pkt mustEqual string
+      }
+    }
+
     "WeaponDryFireMessage" should {
       val string = hex"52 4C00"