send card defs timestamp in 6xB4x46

src/Episode3/DataIndex.cc

@@ -1346,9 +1346,11 @@ DataIndex::DataIndex(const string& directory, uint32_t behavior_flags)
   try {
     string decompressed_data;
     if (isfile(directory + "/card-definitions.mnrd")) {
+      this->mtime_for_card_definitions = stat(directory + "/card-definitions.mnrd").st_mtime;
       decompressed_data = load_file(directory + "/card-definitions.mnrd");
       this->compressed_card_definitions.clear();
     } else {
+      this->mtime_for_card_definitions = stat(directory + "/card-definitions.mnr").st_mtime;
       this->compressed_card_definitions = load_file(directory + "/card-definitions.mnr");
       decompressed_data = prs_decompress(this->compressed_card_definitions);
     }
@@ -1514,6 +1516,10 @@ set<uint32_t> DataIndex::all_card_ids() const {
   return ret;
 }
 
+uint64_t DataIndex::card_definitions_mtime() const {
+  return this->mtime_for_card_definitions;
+}
+
 const string& DataIndex::get_compressed_map_list() const {
   if (this->compressed_map_list.empty()) {
     // TODO: Write a version of prs_compress that takes iovecs (or something

src/Episode3/DataIndex.hh

@@ -892,6 +892,7 @@ public:
   std::shared_ptr<const CardEntry> definition_for_card_name(
       const std::string& name) const;
   std::set<uint32_t> all_card_ids() const;
+  uint64_t card_definitions_mtime() const;
 
   const std::string& get_compressed_map_list() const;
   std::shared_ptr<const MapEntry> definition_for_map_number(uint32_t id) const;
@@ -910,6 +911,7 @@ private:
   std::string compressed_card_definitions;
   std::unordered_map<uint32_t, std::shared_ptr<CardEntry>> card_definitions;
   std::unordered_map<std::string, std::shared_ptr<CardEntry>> card_definitions_by_name;
+  uint64_t mtime_for_card_definitions;
 
   // The compressed map list is generated on demand from the maps map below.
   // It's marked mutable because the logical consistency of the DataIndex object

src/Episode3/Server.cc

@@ -14,8 +14,7 @@ namespace Episode3 {
 // These strings in the original implementation did not contain the semicolons
 // (or anything after them).
 static const char* VERSION_SIGNATURE =
-    "[V1][FINAL2.0] 03/09/13 15:30 by K.Toya; newserv Ep3 engine";
-static const char* SIGNATURE_DATE = "Jan 21 2004 18:36:47; updated 2022";
+    "newserv Ep3 based on [V1][FINAL2.0] 03/09/13 15:30 by K.Toya";
 
 
 
@@ -124,10 +123,7 @@ void Server::init() {
   this->ruler_server->link_objects(
       this->base()->map_and_rules1, this->state_flags, this->assist_server);
 
-  G_ServerVersionStrings_GC_Ep3_6xB4x46 cmd;
-  cmd.version_signature = VERSION_SIGNATURE;
-  cmd.date_str1 = SIGNATURE_DATE;
-  this->send(cmd);
+  this->send_6xB4x46();
 }
 
 shared_ptr<ServerBase> Server::base() {
@@ -182,6 +178,7 @@ int8_t Server::get_winner_team_id() const {
 }
 
 void Server::send(const void* data, size_t size) const {
+  // Note: This function is (obviously) not part of the original implementation.
   auto l = this->base()->lobby.lock();
   if (!l) {
     throw runtime_error("lobby is deleted");
@@ -198,6 +195,10 @@ void Server::send(const void* data, size_t size) const {
     }
   }
 
+  // Note: Sega's servers sent battle commands with the 60 command. The handlers
+  // for 60, 62, and C9 on the client are identical, so we choose to use C9
+  // instead because it's unique to Episode 3, and therefore seems more
+  // appropriate to convey battle commands.
   send_command(l, 0xC9, 0x00, data, size);
   for (auto watcher_l : l->watcher_lobbies) {
     send_command_if_not_loading(watcher_l, 0xC9, 0x00, data, size);
@@ -208,6 +209,22 @@ void Server::send(const void* data, size_t size) const {
   }
 }
 
+void Server::send_6xB4x46() const {
+  // Note: This function is not part of the original implementation; it was
+  // factored out from its callsites in this file and the strings were changed.
+  auto l = this->base()->lobby.lock();
+  if (!l) {
+    throw runtime_error("lobby is deleted");
+  }
+
+  G_ServerVersionStrings_GC_Ep3_6xB4x46 cmd46;
+  cmd46.version_signature = VERSION_SIGNATURE;
+  cmd46.date_str1 = format_time(this->base()->data_index->card_definitions_mtime() * 1000000);
+  cmd46.date_str2 = string_printf("Lobby/%08" PRIX32 " random %08" PRIX32,
+      l->lobby_id, l->random_seed);
+  this->send(cmd46);
+}
+
 string Server::prepare_6xB6x41_map_definition(
     shared_ptr<const DataIndex::MapEntry> map) {
   const auto& compressed = map->compressed();
@@ -1425,10 +1442,7 @@ void Server::setup_and_start_battle() {
 
   this->battle_start_usecs = now();
 
-  G_ServerVersionStrings_GC_Ep3_6xB4x46 cmd46;
-  cmd46.version_signature = VERSION_SIGNATURE;
-  cmd46.date_str1 = SIGNATURE_DATE;
-  this->send(cmd46);
+  this->send_6xB4x46();
 }
 
 void Server::update_battle_state_flags_and_send_6xB4x03_if_needed(

src/Episode3/Server.hh

@@ -136,6 +136,8 @@ public:
   void send_debug_message_if_error_code_nonzero(
       uint8_t client_id, int32_t error_code) const;
 
+  void send_6xB4x46() const;
+
   void add_team_exp(uint8_t team_id, int32_t exp);
   bool advance_battle_phase();
   void action_phase_after();

src/ReplaySession.cc

@@ -292,6 +292,16 @@ void ReplaySession::apply_default_mask(shared_ptr<Event> ev) {
           }
           break;
         }
+        case 0xC9: {
+          if (cmd_size == 0xCC) {
+            auto& cmd_mask = check_size_t<G_ServerVersionStrings_GC_Ep3_6xB4x46>(
+                cmd_data, cmd_size);
+            cmd_mask.version_signature.clear(0);
+            cmd_mask.date_str1.clear(0);
+            cmd_mask.date_str2.clear(0);
+          }
+          break;
+        }
       }
       break;
     }