minecraft-pi-reborn/mods/src/death/death.cpp

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#include <string>
#include <libreborn/libreborn.h>
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#include <symbols/minecraft.h>
#include "../init/init.h"
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#include "../feature/feature.h"
// Death Messages
static std::string get_death_message(unsigned char *player) {
// Get Username
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std::string *username = (std::string *) (player + Player_username_property_offset);
// Prepare Death Message
std::string message;
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message.append(username->c_str());
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 new_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 (new_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);
}
// Init
void init_death() {
// Death Messages
if (feature_has("Implement Death Messages", server_auto)) {
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patch_address(ServerPlayer_actuallyHurt_vtable_addr, (void *) ServerPlayer_actuallyHurt_injection);
patch_address(LocalPlayer_actuallyHurt_vtable_addr, (void *) LocalPlayer_actuallyHurt_injection);
}
}