implement quest stats command

src/CommandFormats.hh

@@ -1096,11 +1096,29 @@ struct S_QuestMenuEntry_BB_A2_A4 {
 // download quest menu is closed, either by downloading a quest or canceling,
 // the client sends A0 instead.
 
-// AA: Invalid command
-// TODO: Sylverant defines this as quest stats, specifically used during Maximum
-// Attack 2. Verify this and document if needed.
+// AA (C->S): Update quest statistics
+// This command is used in Maximum Attack 2, but its format is unlikely to be
+// specific to that quest. The structure here represents the only instance I've
+// seen so far.
+// The server will respond with an AB command.
 
-// AB (S->C): Unknown (BB)
+struct C_UpdateQuestStatistics_AA {
+  le_uint32_t quest_internal_id;
+  le_uint16_t request_token;
+  le_uint16_t unknown_a1;
+  le_uint32_t unknown_a2;
+  le_uint32_t kill_count;
+  le_uint32_t time_taken; // in seconds
+  parray<uint8_t, 0x14> unknown_a3;
+};
+
+// AB (S->C): Confirm update quest statistics
+
+struct S_ConfirmUpdateQuestStatistics_AB {
+  le_uint32_t unknown_a1; // 0
+  le_uint16_t request_token; // Should match token sent in AA command
+  le_uint16_t unknown_a2; // Schtserv always sends 0xBFFF here
+};
 
 // AC: Quest barrier
 // No arguments

src/ReceiveCommands.cc

@@ -1025,6 +1025,23 @@ void process_quest_ready(shared_ptr<ServerState> s, shared_ptr<Client> c,
   }
 }
 
+void process_update_quest_statistics(shared_ptr<ServerState> s,
+    shared_ptr<Client> c, uint16_t, uint32_t, const string& data) { // AA
+  const auto& cmd = check_size_t<C_UpdateQuestStatistics_AA>(data);
+
+  auto l = s->find_lobby(c->lobby_id);
+  if (!l || !l->is_game() || !l->loading_quest.get() ||
+      (l->loading_quest->internal_id != cmd.quest_internal_id)) {
+    return;
+  }
+
+  S_ConfirmUpdateQuestStatistics_AB response;
+  response.unknown_a1 = 0;
+  response.request_token = cmd.request_token;
+  response.unknown_a2 = 0xBFFF;
+  send_command_t(c, 0xAB, 0x00, response);
+}
+
 void process_gba_file_request(shared_ptr<ServerState>, shared_ptr<Client> c,
     uint16_t, uint32_t, const string& data) { // D7
   string filename(data);
@@ -1835,7 +1852,7 @@ static process_command_t dc_handlers[0x100] = {
   // A0
   process_change_ship, process_change_block, process_quest_list_request, nullptr,
   nullptr, nullptr, nullptr, nullptr,
-  nullptr, process_ignored_command, nullptr, nullptr,
+  nullptr, process_ignored_command, process_update_quest_statistics, nullptr,
   process_quest_ready, nullptr, nullptr, nullptr,
 
   // B0
@@ -1918,7 +1935,7 @@ static process_command_t pc_handlers[0x100] = {
   // A0
   process_change_ship, process_change_block, process_quest_list_request, nullptr,
   nullptr, nullptr, nullptr, nullptr,
-  nullptr, process_ignored_command, nullptr, nullptr,
+  nullptr, process_ignored_command, process_update_quest_statistics, nullptr,
   process_quest_ready, nullptr, nullptr, nullptr,
 
   // B0
@@ -2002,7 +2019,7 @@ static process_command_t gc_handlers[0x100] = {
   // A0
   process_change_ship, process_change_block, process_quest_list_request, nullptr,
   nullptr, nullptr, process_ignored_command, process_ignored_command,
-  nullptr, process_ignored_command, nullptr, nullptr,
+  nullptr, process_ignored_command, process_update_quest_statistics, nullptr,
   process_quest_ready, nullptr, nullptr, nullptr,
 
   // B0
@@ -2091,7 +2108,7 @@ static process_command_t bb_handlers[0x100] = {
   // A0
   process_change_ship, process_change_block, process_quest_list_request, nullptr,
   nullptr, nullptr, nullptr, nullptr,
-  nullptr, process_ignored_command, nullptr, nullptr,
+  nullptr, process_ignored_command, process_update_quest_statistics, nullptr,
   process_quest_ready, nullptr, nullptr, nullptr,
 
   // B0