implement arm swinging animation

* Added packets to show players swinging their arms

* fix misleading comment

---------

Co-authored-by: p2r3 <p2r3@p2r3.com>

src/packets.c

@@ -762,6 +762,43 @@ int cs_setPlayerMovementFlags (int client_fd, uint8_t *on_ground) {
   return 0;
 }
 
+// C->S Swing Arm (serverbound)
+int cs_swingArm (int client_fd) {
+
+  PlayerData *player;
+  if (getPlayerData(client_fd, &player)) return 1;
+
+  uint8_t hand = readVarInt(client_fd);
+
+  uint8_t animation = 255;
+  switch (hand) {
+    case 0: {
+      animation = 0;
+      break;
+    }
+    case 1: {
+      animation = 2;
+      break;
+    }
+  }
+
+  if (animation == 255)
+    return 1;
+
+  // Forward animation to all connected players
+  for (int i = 0; i < MAX_PLAYERS; i ++) {
+    PlayerData* other_player = &player_data[i];
+
+    if (other_player->client_fd == -1) continue;
+    if (other_player->client_fd == player->client_fd) continue;
+    if (other_player->flags & 0x20) continue;
+
+    sc_entityAnimation(other_player->client_fd, player->client_fd, animation);
+  }
+
+  return 0;
+}
+
 // C->S Set Held Item (serverbound)
 int cs_setHeldItem (int client_fd) {
 
@@ -880,6 +917,17 @@ int sc_spawnEntityPlayer (int client_fd, PlayerData player) {
   );
 }
 
+// S->C Entity Animation
+int sc_entityAnimation (int client_fd, int id, uint8_t animation) {
+  writeVarInt(client_fd, 2 + sizeVarInt(id));
+  writeByte(client_fd, 0x02);
+
+  writeVarInt(client_fd, id); // Entity ID
+  writeByte(client_fd, animation); // Animation
+
+  return 0;
+}
+
 // S->C Teleport Entity
 int sc_teleportEntity (
   int client_fd, int id,