Packet: PickupItemMessage and create tests (#117)

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

@@ -382,7 +382,7 @@ object GamePacketOpcode extends Enumeration {
     case 0x33 => game.ObjectHeldMessage.decode
     case 0x34 => game.WeaponFireMessage.decode
     case 0x35 => game.AvatarJumpMessage.decode
-    case 0x36 => noDecoder(PickupItemMessage)
+    case 0x36 => game.PickupItemMessage.decode
     case 0x37 => game.DropItemMessage.decode
     // 0x38
     case 0x38 => noDecoder(InventoryStateMessage)

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

@@ -0,0 +1,39 @@
+// Copyright (c) 2017 PSForever
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PlanetSideGamePacket}
+import scodec.Codec
+import scodec.codecs._
+
+/**
+  * Dispatched by the client when the player's intent is to collect an item from the ground.<br>
+  * <br>
+  * When a player faces a freed item on the ground in the game world, a prompt appears that invites him to pick it up.
+  * Doing so generates this packet.
+  * The server determines the exact inventory position where the item will get placed.
+  * If the inventory has insufficient space to accommodate the item, it gets put into the player's hand (on the cursor).<br>
+  * <br>
+  * This packet is complemented by an `ObjectAttachMessage` packet from the server that performs the actual "picking up."
+  * @param item_guid na
+  * @param player_guid na
+  * @param unk1 na
+  * @param unk2 na
+  */
+final case class PickupItemMessage(item_guid : PlanetSideGUID,
+                                   player_guid : PlanetSideGUID,
+                                   unk1 : Int,
+                                   unk2 : Int)
+  extends PlanetSideGamePacket {
+  type Packet = PickupItemMessage
+  def opcode = GamePacketOpcode.PickupItemMessage
+  def encode = PickupItemMessage.encode(this)
+}
+
+object PickupItemMessage extends Marshallable[PickupItemMessage] {
+  implicit val codec : Codec[PickupItemMessage] = (
+    ("item_guid" | PlanetSideGUID.codec) ::
+      ("player_guid" | PlanetSideGUID.codec) ::
+      ("unk1" | uint8L) ::
+      ("unk2" | uint16L)
+    ).as[PickupItemMessage]
+}