Add Death Messages

libreborn/include/libreborn/minecraft.h

@@ -5,6 +5,11 @@
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-variable"
 
+// bool In C
+#ifndef __cplusplus
+typedef uint32_t bool;
+#endif
+
 // Globals
 
 static char **default_path = (char **) 0xe264; // /.minecraft/
@@ -98,8 +103,11 @@ static Minecraft_releaseMouse_t Minecraft_releaseMouse = (Minecraft_releaseMouse
 typedef void (*Minecraft_grabMouse_t)(unsigned char *minecraft);
 static Minecraft_grabMouse_t Minecraft_grabMouse = (Minecraft_grabMouse_t) 0x15d10;
 
+typedef void (*Minecraft_leaveGame_t)(unsigned char *minecraft, bool save_remote_level);
+static Minecraft_leaveGame_t Minecraft_leaveGame = (Minecraft_leaveGame_t) 0x15ea0;
+
 static uint32_t Minecraft_screen_width_property_offset = 0x20; // int32_t
-static uint32_t Minecraft_server_side_network_handler_property_offset = 0x174; // ServerSideNetworkHandler *
+static uint32_t Minecraft_network_handler_property_offset = 0x174; // NetEventCallback *
 static uint32_t Minecraft_rak_net_instance_property_offset = 0x170; // RakNetInstance *
 static uint32_t Minecraft_level_property_offset = 0x188; // Level *
 static uint32_t Minecraft_textures_property_offset = 0x164; // Textures *
@@ -110,6 +118,7 @@ static uint32_t Minecraft_hit_result_property_offset = 0xc38; // HitResult
 static uint32_t Minecraft_progress_property_offset = 0xc60; // int32_t
 static uint32_t Minecraft_command_server_property_offset = 0xcc0; // CommandServer *
 static uint32_t Minecraft_screen_property_offset = 0xc10; // Screen *
+static uint32_t Minecraft_gui_property_offset = 0x198; // Gui
 
 // CommandServer
 
@@ -147,14 +156,31 @@ static Player_isUsingItem_t Player_isUsingItem = (Player_isUsingItem_t) 0x8f15c;
 
 static uint32_t Player_username_property_offset = 0xbf4; // char *
 
+// Entity
+
+typedef void (*Entity_die_t)(unsigned char *entity, unsigned char *cause);
+static uint32_t Entity_die_vtable_offset = 0x130;
+
+// Mob
+
+typedef void (*Mob_actuallyHurt_t)(unsigned char *entity, int32_t damage);
+static Mob_actuallyHurt_t Mob_actuallyHurt = (Mob_actuallyHurt_t) 0x7f11c;
+
+static uint32_t Mob_health_property_offset = 0xec; // int32_t
+
 // LocalPlayer
 
+static Mob_actuallyHurt_t LocalPlayer_actuallyHurt = (Mob_actuallyHurt_t) 0x44010;
+static void *LocalPlayer_actuallyHurt_vtable_addr = (void *) 0x10639c;
+
 static void *LocalPlayer_openTextEdit_vtable_addr = (void *) 0x106460;
 
 static uint32_t LocalPlayer_minecraft_property_offset = 0xc90; // Minecraft *
 
 // ServerPlayer
 
+static void *ServerPlayer_actuallyHurt_vtable_addr = (void *) 0x109fa4;
+
 static uint32_t ServerPlayer_minecraft_property_offset = 0xc8c; // Minecraft *
 static uint32_t ServerPlayer_guid_property_offset = 0xc08; // RakNetGUID
 
@@ -169,9 +195,17 @@ static Gui_handleClick_t Gui_handleClick = (Gui_handleClick_t) 0x2599c;
 typedef void (*Gui_renderOnSelectItemNameText_t)(unsigned char *gui, int32_t param_1, unsigned char *font, int32_t param_2);
 static Gui_renderOnSelectItemNameText_t Gui_renderOnSelectItemNameText = (Gui_renderOnSelectItemNameText_t) 0x26aec;
 
+typedef void (*Gui_renderChatMessages_t)(unsigned char *gui, int32_t param_1, uint32_t param_2, bool param_3, unsigned char *font);
+static Gui_renderChatMessages_t Gui_renderChatMessages = (Gui_renderChatMessages_t) 0x273d8;
+
 static uint32_t Gui_minecraft_property_offset = 0x9f4; // Minecraft *
 static uint32_t Gui_selected_item_text_timer_property_offset = 0x9fc; // float
 
+// Textures
+
+typedef void (*Textures_tick_t)(unsigned char *textures, bool param_1);
+static Textures_tick_t Textures_tick = (Textures_tick_t) 0x531c4;
+
 // GameMode Constructors
 
 #define CREATOR_MODE_SIZE 0x18
@@ -274,6 +308,14 @@ static uint32_t RakNetInstance_peer_property_offset = 0x4;
 typedef struct RakNet_SystemAddress (*RakNet_RakPeer_GetSystemAddressFromGuid_t)(unsigned char *rak_peer, struct RakNet_RakNetGUID guid);
 static uint32_t RakNet_RakPeer_GetSystemAddressFromGuid_vtable_offset = 0xd0;
 
+typedef bool (*RakNet_RakPeer_IsBanned_t)(unsigned char *rak_peer, const char *ip);
+static RakNet_RakPeer_IsBanned_t RakNet_RakPeer_IsBanned = (RakNet_RakPeer_IsBanned_t) 0xda3b4;
+
+// RakNet::SystemAddress
+
+typedef char *(*RakNet_SystemAddress_ToString_t)(struct RakNet_SystemAddress *system_address, bool print_delimiter, char delimiter);
+static RakNet_SystemAddress_ToString_t RakNet_SystemAddress_ToString = (RakNet_SystemAddress_ToString_t) 0xd6198;
+
 // ServerSideNetworkHandler
 
 typedef void (*ServerSideNetworkHandler_onDisconnect_t)(unsigned char *server_side_network_handler, unsigned char *guid);
@@ -283,12 +325,9 @@ static void *ServerSideNetworkHandler_onDisconnect_vtable_addr = (void *) 0x109b
 typedef unsigned char *(*ServerSideNetworkHandler_getPlayer_t)(unsigned char *server_side_network_handler, unsigned char *guid);
 static ServerSideNetworkHandler_getPlayer_t ServerSideNetworkHandler_getPlayer = (ServerSideNetworkHandler_getPlayer_t) 0x75464;
 
-static void *ServerSideNetworkHandler_handle_ChatPacket_vtable_addr = (void *) 0x109c60;
-
-// Entity
+typedef void (*ServerSideNetworkHandler_handle_t)(unsigned char *server_side_network_handler, unsigned char *rak_net_guid, unsigned char *packet);
 
-typedef void (*Entity_die_t)(unsigned char *entity, unsigned char *cause);
-static uint32_t Entity_die_vtable_offset = 0x130;
+static void *ServerSideNetworkHandler_handle_ChatPacket_vtable_addr = (void *) 0x109c60;
 
 // Inventory
 
@@ -326,6 +365,11 @@ static ItemRenderer_renderGuiItemCorrect_t ItemRenderer_renderGuiItemCorrect = (
 
 // Structures
 
+struct AppPlatform_readAssetFile_return_value {
+    char *data;
+    int32_t length;
+};
+
 struct ConnectedClient {
     uint32_t sock;
     std::string str;
@@ -337,10 +381,6 @@ struct ConnectedClient {
 typedef void (*AppPlatform_saveScreenshot_t)(unsigned char *app_platform, std::string const& param1, std::string const& param_2);
 static void *AppPlatform_linux_saveScreenshot_vtable_addr = (void *) 0x102160;
 
-struct AppPlatform_readAssetFile_return_value {
-    char *data;
-    int32_t length;
-};
 typedef AppPlatform_readAssetFile_return_value (*AppPlatform_readAssetFile_t)(unsigned char *app_platform, std::string const& path);
 static AppPlatform_readAssetFile_t AppPlatform_readAssetFile = (AppPlatform_readAssetFile_t) 0x12b10;
 
@@ -349,9 +389,6 @@ static AppPlatform_readAssetFile_t AppPlatform_readAssetFile = (AppPlatform_read
 typedef void (*Minecraft_selectLevel_t)(unsigned char *minecraft, std::string const& level_dir, std::string const& level_name, LevelSettings const& vsettings);
 static Minecraft_selectLevel_t Minecraft_selectLevel = (Minecraft_selectLevel_t) 0x16f38;
 
-typedef void (*Minecraft_leaveGame_t)(unsigned char *minecraft, bool save_remote_level);
-static Minecraft_leaveGame_t Minecraft_leaveGame = (Minecraft_leaveGame_t) 0x15ea0;
-
 // CommandServer
 
 typedef std::string (*CommandServer_parse_t)(unsigned char *command_server, struct ConnectedClient &client, std::string const& command);
@@ -367,24 +404,6 @@ static Level_addParticle_t Level_addParticle = (Level_addParticle_t) 0xa449c;
 typedef void (*Gui_addMessage_t)(unsigned char *gui, std::string const& text);
 static Gui_addMessage_t Gui_addMessage = (Gui_addMessage_t) 0x27820;
 
-typedef void (*Gui_renderChatMessages_t)(unsigned char *gui, int32_t param_1, uint32_t param_2, bool param_3, unsigned char *font);
-static Gui_renderChatMessages_t Gui_renderChatMessages = (Gui_renderChatMessages_t) 0x273d8;
-
-// Textures
-
-typedef void (*Textures_tick_t)(unsigned char *textures, bool param_1);
-static Textures_tick_t Textures_tick = (Textures_tick_t) 0x531c4;
-
-// RakNet::RakPeer
-
-typedef bool (*RakNet_RakPeer_IsBanned_t)(unsigned char *rak_peer, const char *ip);
-static RakNet_RakPeer_IsBanned_t RakNet_RakPeer_IsBanned = (RakNet_RakPeer_IsBanned_t) 0xda3b4;
-
-// RakNet::SystemAddress
-
-typedef char *(*RakNet_SystemAddress_ToString_t)(struct RakNet_SystemAddress *system_address, bool print_delimiter, char delimiter);
-static RakNet_SystemAddress_ToString_t RakNet_SystemAddress_ToString = (RakNet_SystemAddress_ToString_t) 0xd6198;
-
 // ServerSideNetworkHandler
 
 typedef void (*ServerSideNetworkHandler_displayGameMessage_t)(unsigned char *server_side_network_handler, std::string const& message);

mods/src/chat/chat.cpp

@@ -49,7 +49,7 @@ static void CommandServer_parse_CommandServer_dispatchPacket_injection(unsigned
         if ((*RakNetInstance_isServer)(rak_net_instance)) {
             // Hosting Multiplayer
             char *message = *(char **) (packet + ChatPacket_message_property_offset);
-            unsigned char *server_side_network_handler = *(unsigned char **) (minecraft + Minecraft_server_side_network_handler_property_offset);
+            unsigned char *server_side_network_handler = *(unsigned char **) (minecraft + Minecraft_network_handler_property_offset);
             send_message(server_side_network_handler, *default_username, message);
         } else {
             // Client

mods/src/chat/ui.c

@@ -78,6 +78,7 @@ static void *chat_thread(__attribute__((unused)) void *nop) {
     char *output = run_command("echo \"${CHAT_WINDOW_TCL}\" | wish -name \"Minecraft - Pi edition\"", &return_code);
     // Handle Message
     if (output != NULL) {
+        // Check Return Code
         if (return_code == 0) {
             // Remove Ending Newline
             int length = strlen(output);
@@ -85,10 +86,13 @@ static void *chat_thread(__attribute__((unused)) void *nop) {
                 output[length - 1] = '\0';
             }
             length = strlen(output);
-            // Submit
-            chat_queue_message(output);
+            // Don't Allow Empty Strings
+            if (length > 0) {
+                // Submit
+                chat_queue_message(output);
+            }
         }
-        // Free
+        // Free Output
         free(output);
     }
     // Update Counter

mods/src/misc/misc.c

@@ -8,6 +8,38 @@
 
 #define NEW_PATH "/.minecraft-pi/"
 
+// Render Selected Item Text
+static void Gui_renderChatMessages_injection(unsigned char *gui, int32_t param_1, uint32_t param_2, uint32_t param_3, unsigned char *font) {
+    // Call Original Method
+    (*Gui_renderChatMessages)(gui, param_1, param_2, param_3, font);
+    // Calculate Selected Item Text Scale
+    unsigned char *minecraft = *(unsigned char **) (gui + Gui_minecraft_property_offset);
+    int32_t screen_width = *(int32_t *) (minecraft + Minecraft_screen_width_property_offset);
+    float scale = ((float) screen_width) * *InvGuiScale;
+    // Render Selected Item Text
+    (*Gui_renderOnSelectItemNameText)(gui, (int32_t) scale, font, param_1 - 0x13);
+}
+// Reset Selected Item Text Timer On Slot Select
+static uint32_t reset_selected_item_text_timer = 0;
+static void Gui_tick_injection(unsigned char *gui) {
+    // Call Original Method
+    (*Gui_tick)(gui);
+    // Handle Reset
+    float *selected_item_text_timer = (float *) (gui + Gui_selected_item_text_timer_property_offset);
+    if (reset_selected_item_text_timer) {
+        // Reset
+        *selected_item_text_timer = 0;
+        reset_selected_item_text_timer = 0;
+    }
+}
+// Trigger Reset Selected Item Text Timer On Slot Select
+static void Inventory_selectSlot_injection(unsigned char *inventory, int32_t slot) {
+    // Call Original Method
+    (*Inventory_selectSlot)(inventory, slot);
+    // Trigger Reset Selected Item Text Timer
+    reset_selected_item_text_timer = 1;
+}
+
 void init_misc() {
     // Store Data In ~/.minecraft-pi Instead Of ~/.minecraft
     patch_address((void *) default_path, (void *) NEW_PATH);
@@ -18,6 +50,11 @@ void init_misc() {
         patch((void *) 0x63c98, invalid_item_background_patch);
     }
 
+    // Fix Selected Item Text
+    overwrite_calls((void *) Gui_renderChatMessages, (void *) Gui_renderChatMessages_injection);
+    overwrite_calls((void *) Gui_tick, (void *) Gui_tick_injection);
+    overwrite_calls((void *) Inventory_selectSlot, (void *) Inventory_selectSlot_injection);
+
     // Init C++
     init_misc_cpp();
 }

mods/src/misc/misc.cpp

@@ -25,6 +25,7 @@ static AppPlatform_readAssetFile_return_value AppPlatform_readAssetFile_injectio
     return ret;
 }
 
+// Add Item To Inventory
 static void inventory_add_item(unsigned char *inventory, unsigned char *item, bool is_tile) {
     unsigned char *item_instance = (unsigned char *) ::operator new(ITEM_INSTANCE_SIZE);
     ALLOC_CHECK(item_instance);
@@ -67,38 +68,6 @@ static int32_t Inventory_setupDefault_FillingContainer_addItem_call_injection(un
     return ret;
 }
 
-// Render Selected Item Text
-static void Gui_renderChatMessages_injection(unsigned char *gui, int32_t param_1, uint32_t param_2, bool param_3, unsigned char *font) {
-    // Call Original Method
-    (*Gui_renderChatMessages)(gui, param_1, param_2, param_3, font);
-    // Calculate Selected Item Text Scale
-    unsigned char *minecraft = *(unsigned char **) (gui + Gui_minecraft_property_offset);
-    int32_t screen_width = *(int32_t *) (minecraft + Minecraft_screen_width_property_offset);
-    float scale = ((float) screen_width) * *InvGuiScale;
-    // Render Selected Item Text
-    (*Gui_renderOnSelectItemNameText)(gui, (int32_t) scale, font, param_1 - 0x13);
-}
-// Reset Selected Item Text Timer On Slot Select
-static bool reset_selected_item_text_timer = false;
-static void Gui_tick_injection(unsigned char *gui) {
-    // Call Original Method
-    (*Gui_tick)(gui);
-    // Handle Reset
-    float *selected_item_text_timer = (float *) (gui + Gui_selected_item_text_timer_property_offset);
-    if (reset_selected_item_text_timer) {
-        // Reset
-        *selected_item_text_timer = 0;
-        reset_selected_item_text_timer = false;
-    }
-}
-// Trigger Reset Selected Item Text Timer On Slot Select
-static void Inventory_selectSlot_injection(unsigned char *inventory, int32_t slot) {
-    // Call Original Method
-    (*Inventory_selectSlot)(inventory, slot);
-    // Trigger Reset Selected Item Text Timer
-    reset_selected_item_text_timer = true;
-}
-
 // Print Chat To Log
 static bool Gui_addMessage_recursing = false;
 static void Gui_addMessage_injection(unsigned char *gui, std::string const& text) {
@@ -120,6 +89,57 @@ static void Gui_addMessage_injection(unsigned char *gui, std::string const& text
     }
 }
 
+// Death Messages
+static std::string get_death_message(unsigned char *player) {
+    // Get Username
+    char *username = *(char **) (player + Player_username_property_offset);
+
+    // Prepare Death Message
+    std::string message;
+    message.append(username);
+    message.append(" has died");
+
+    // Return
+    return message;
+}
+// Common Death Message Logic
+static void Player_actuallyHurt_injection_helper(unsigned char *player, int32_t damage, bool is_local_player) {
+    // Store Old Health
+    int32_t old_health = *(int32_t *) (player + Mob_health_property_offset);
+
+    // Call Original Method
+    (*(is_local_player ? LocalPlayer_actuallyHurt : Mob_actuallyHurt))(player, damage);
+
+    // Store New Health
+    int32_t health = *(int32_t *) (player + Mob_health_property_offset);
+
+    // Get Variables
+    unsigned char *minecraft = *(unsigned char **) (player + (is_local_player ? LocalPlayer_minecraft_property_offset : ServerPlayer_minecraft_property_offset));
+    unsigned char *rak_net_instance = *(unsigned char **) (minecraft + Minecraft_rak_net_instance_property_offset);
+    unsigned char *rak_net_instance_vtable = *(unsigned char **) rak_net_instance;
+    // Only Run On Server-Side
+    RakNetInstance_isServer_t RakNetInstance_isServer = *(RakNetInstance_isServer_t *) (rak_net_instance_vtable + RakNetInstance_isServer_vtable_offset);
+    if ((*RakNetInstance_isServer)(rak_net_instance)) {
+        // Check Health
+        if (health < 1 && old_health >= 1) {
+            // Get Death Message
+            std::string message = get_death_message(player);
+
+            // Post Death Message
+            unsigned char *server_side_network_handler = *(unsigned char **) (minecraft + Minecraft_network_handler_property_offset);
+            (*ServerSideNetworkHandler_displayGameMessage)(server_side_network_handler, message);
+        }
+    }
+}
+// ServerPlayer Death Message Logic
+static void ServerPlayer_actuallyHurt_injection(unsigned char *player, int32_t damage) {
+    Player_actuallyHurt_injection_helper(player, damage, false);
+}
+// LocalPlayer Death Message Logic
+static void LocalPlayer_actuallyHurt_injection(unsigned char *player, int32_t damage) {
+    Player_actuallyHurt_injection_helper(player, damage, true);
+}
+
 void init_misc_cpp() {
     // Implement AppPlatform::readAssetFile So Translations Work
     overwrite((void *) AppPlatform_readAssetFile, (void *) AppPlatform_readAssetFile_injection);
@@ -129,11 +149,10 @@ void init_misc_cpp() {
         overwrite_call((void *) 0x8e0fc, (void *) Inventory_setupDefault_FillingContainer_addItem_call_injection);
     }
 
-    // Fix Selected Item Text
-    overwrite_calls((void *) Gui_renderChatMessages, (void *) Gui_renderChatMessages_injection);
-    overwrite_calls((void *) Gui_tick, (void *) Gui_tick_injection);
-    overwrite_calls((void *) Inventory_selectSlot, (void *) Inventory_selectSlot_injection);
-
     // Print Chat To Log
     overwrite_calls((void *) Gui_addMessage, (void *) Gui_addMessage_injection);
+
+    // Death Messages
+    patch_address(ServerPlayer_actuallyHurt_vtable_addr, (void *) ServerPlayer_actuallyHurt_injection);
+    patch_address(LocalPlayer_actuallyHurt_vtable_addr, (void *) LocalPlayer_actuallyHurt_injection);
 }

mods/src/server/server.cpp

@@ -267,7 +267,7 @@ static void handle_server_stop(unsigned char *minecraft) {
 
 // Get ServerSideNetworkHandler From Minecraft
 static unsigned char *get_server_side_network_handler(unsigned char *minecraft) {
-    return *(unsigned char **) (minecraft + Minecraft_server_side_network_handler_property_offset);
+    return *(unsigned char **) (minecraft + Minecraft_network_handler_property_offset);
 }
 
 // Handle Commands