minecraft-pi-reborn/mods/src/extra.c
2020-10-30 13:27:50 -04:00

275 lines
9.7 KiB
C

#include <stdint.h>
#include <stdio.h>
#include <libcore/libcore.h>
#include "extra.h"
#include "server/server.h"
static int mob_spawning = 0;
static uint32_t LevelData_getSpawnMobs_injection(__attribute__((unused)) int32_t obj) {
return mob_spawning;
}
static int is_right_click = 0;
void extra_set_is_right_click(int val) {
is_right_click = val;
}
typedef void (*releaseUsingItem_t)(unsigned char *t, unsigned char *player);
static releaseUsingItem_t survival_releaseUsingItem = (releaseUsingItem_t) 0x1a598;
static releaseUsingItem_t creative_releaseUsingItem = (releaseUsingItem_t) 0x1b1a0;
typedef void (*handle_input_t)(unsigned char *, unsigned char *, unsigned char *, unsigned char *);
static handle_input_t handle_input = (handle_input_t) 0x15ffc;
static void *handle_input_original = NULL;
static int is_survival = -1;
static void handle_input_injection(unsigned char *param_1, unsigned char *param_2, unsigned char *param_3, unsigned char *param_4) {
// Call Original Method
revert_overwrite((void *) handle_input, handle_input_original);
(*handle_input)(param_1, param_2, param_3, param_4);
revert_overwrite((void *) handle_input, handle_input_original);
// GameMode Is Offset From param_1 By 0x160
// Player Is Offset From param_1 By 0x18c
if (!is_right_click) {
unsigned char *game_mode = *(unsigned char **) (param_1 + 0x160);
unsigned char *player = *(unsigned char **) (param_1 + 0x18c);
if (player != NULL && game_mode != NULL) {
(*(is_survival ? survival_releaseUsingItem : creative_releaseUsingItem))(game_mode, player);
}
}
extra_clear_input();
}
typedef void (*Gui_tickItemDrop_t)(unsigned char *);
static Gui_tickItemDrop_t Gui_tickItemDrop = (Gui_tickItemDrop_t) 0x27778;
static void *Gui_tickItemDrop_original = NULL;
#include <SDL/SDL_events.h>
static void Gui_tickItemDrop_injection(unsigned char *this) {
if (SDL_ShowCursor(SDL_QUERY) == SDL_ENABLE) {
revert_overwrite((void *) Gui_tickItemDrop, Gui_tickItemDrop_original);
(*Gui_tickItemDrop)(this);
revert_overwrite((void *) Gui_tickItemDrop, Gui_tickItemDrop_original);
}
}
typedef void (*Gui_handleClick_t)(unsigned char *, unsigned char *, unsigned char *, unsigned char *);
static Gui_handleClick_t Gui_handleClick = (Gui_handleClick_t) 0x2599c;
static void *Gui_handleClick_original = NULL;
static void Gui_handleClick_injection(unsigned char *this, unsigned char *param_2, unsigned char *param_3, unsigned char *param_4) {
if (SDL_ShowCursor(SDL_QUERY) == SDL_ENABLE) {
revert_overwrite((void *) Gui_handleClick, Gui_handleClick_original);
(*Gui_handleClick)(this, param_2, param_3, param_4);
revert_overwrite((void *) Gui_handleClick, Gui_handleClick_original);
}
}
static void *Creator = (void *) 0x1a044;
static void *SurvivalMode = (void *) 0x1b7d8;
static void *CreativeMode = (void *) 0x1b258;
// Patch Game Mode
static void set_is_survival(int new_is_survival) {
if (is_survival != new_is_survival) {
fprintf(stderr, "Setting Game Mode: %s\n", new_is_survival ? "Survival" : "Creative");
// Correct Inventpry UI
unsigned char inventory_patch[4] = {new_is_survival ? 0x00 : 0x01, 0x30, 0xa0, 0xe3};
patch((void *) 0x16efc, inventory_patch);
// Use Correct Size For GameMode Object
unsigned char size_patch[4] = {new_is_survival ? 0x24 : 0x18, 0x00, 0xa0, 0xe3};
patch((void *) 0x16ee4, size_patch);
// Replace Creator Constructor With CreatorMode Or SurvivalMode Constructor
overwrite(Creator, new_is_survival ? SurvivalMode : CreativeMode);
is_survival = new_is_survival;
}
}
typedef void (*Minecraft_setIsCreativeMode_t)(unsigned char *, int32_t);
static Minecraft_setIsCreativeMode_t Minecraft_setIsCreativeMode = (Minecraft_setIsCreativeMode_t) 0x16ec4;
static void *Minecraft_setIsCreativeMode_original = NULL;
static void Minecraft_setIsCreativeMode_injection(unsigned char *this, int32_t new_game_mode) {
set_is_survival(!new_game_mode);
revert_overwrite((void *) Minecraft_setIsCreativeMode, Minecraft_setIsCreativeMode_original);
(*Minecraft_setIsCreativeMode)(this, new_game_mode);
revert_overwrite((void *) Minecraft_setIsCreativeMode, Minecraft_setIsCreativeMode_original);
}
static char *get_username() {
char *username = getenv("MCPI_USERNAME");
if (username == NULL) {
username = "StevePi";
}
return username;
}
typedef void (*Minecraft_init_t)(unsigned char *);
static Minecraft_init_t Minecraft_init = (Minecraft_init_t) 0x1700c;
static void *Minecraft_init_original = NULL;
static void Minecraft_init_injection(unsigned char *this) {
revert_overwrite((void *) Minecraft_init, Minecraft_init_original);
(*Minecraft_init)(this);
revert_overwrite((void *) Minecraft_init, Minecraft_init_original);
// Enable Fancy Graphics
*(this + 83) = 1;
}
// Is Dedicated Server
static int is_server = 0;
// Check For Feature
int extra_has_feature(const char *name) {
if (is_server) {
// Enable All Features In Server
return 1;
} else {
char *env = getenv("MCPI_FEATURES");
char *features = strdup(env != NULL ? env : "");
char *tok = strtok(features, "|");
int ret = 0;
while (tok != NULL) {
if (strcmp(tok, name) == 0) {
ret = 1;
break;
}
tok = strtok(NULL, "|");
}
free(features);
fprintf(stderr, "Feature: %s: %s\n", name, ret ? "Enabled" : "Disabled");
return ret;
}
}
int extra_get_mode() {
char *mode = getenv("MCPI_MODE");
if (mode == NULL) {
ERR("%s", "MCPI Mode Not Specified");
} else if (strcmp("virgl", mode) == 0) {
return 0;
} else if (strcmp("native", mode) == 0) {
return 1;
} else if (strcmp("server", mode) == 0) {
return 2;
} else {
ERR("Inavlid MCPI_MODE: %s", mode);
}
}
__attribute__((constructor)) static void init() {
is_server = extra_get_mode() == 2;
if (is_server) {
server_init();
}
if (extra_has_feature("Touch GUI")) {
// Use Touch UI
unsigned char touch_gui_patch[4] = {0x01, 0x00, 0x50, 0xe3};
patch((void *) 0x292fc, touch_gui_patch);
}
// Dyanmic Game Mode Switching
set_is_survival(1);
Minecraft_setIsCreativeMode_original = overwrite((void *) Minecraft_setIsCreativeMode, Minecraft_setIsCreativeMode_injection);
// Get Default Game Mode
int default_game_mode;
if (is_server) {
default_game_mode = server_get_default_game_mode();
} else {
default_game_mode = !extra_has_feature("Survival Mode");
}
// Set Default Game Mode
unsigned char default_game_mode_patch[4] = {default_game_mode ? 0x01 : 0x00, 0x30, 0xa0, 0xe3};
patch((void *) 0x3d9b8, default_game_mode_patch);
patch((void *) 0x38a78, default_game_mode_patch);
// Disable Item Dropping When Cursor Is Hidden
Gui_tickItemDrop_original = overwrite((void *) Gui_tickItemDrop, Gui_tickItemDrop_injection);
// Disable Opening Inventory Using The Cursor When Cursor Is Hidden
Gui_handleClick_original = overwrite((void *) Gui_handleClick, Gui_handleClick_injection);
if (extra_has_feature("Fix Bow & Arrow")) {
// Fix Bow
handle_input_original = overwrite((void *) handle_input, handle_input_injection);
}
if (extra_has_feature("Fix Attacking")) {
// Allow Attacking Mobs
unsigned char attacking_patch[4] = {0x00, 0xf0, 0x20, 0xe3};
patch((void *) 0x162d4, attacking_patch);
// Fix Instamining When Using This Patch
unsigned char instamine_patch[4] = {0x61, 0x00, 0x00, 0xea};
patch((void *) 0x15b0c, instamine_patch);
// Fix Excessive Hand Swinging When Using This Patch
unsigned char excessive_swing_patch[4] = {0x06, 0x00, 0x00, 0xea};
patch((void *) 0x1593c, excessive_swing_patch);
}
if (is_server) {
mob_spawning = server_get_mob_spawning();
} else {
mob_spawning = extra_has_feature("Mob Spawning");
}
// Set Mob Spawning
overwrite((void *) 0xbabec, LevelData_getSpawnMobs_injection);
// Replace CreatorLevel With ServerLevel (This Fixes Beds And Mob Spawning)
unsigned char patch_data_4[4] = {0x68, 0x7e, 0x01, 0xeb};
patch((void *) 0x16f84, patch_data_4);
// Allocate Correct Size For ServerLevel
unsigned char patch_data_5[4] = {0x94, 0x0b, 0x00, 0x00};
patch((void *) 0x17004, patch_data_5);
if (extra_has_feature("Fancy Graphics")) {
// Enable Fancy Graphics
Minecraft_init_original = overwrite((void *) Minecraft_init, Minecraft_init_injection);
}
// Allow Connecting To Non-Pi Servers
unsigned char patch_data_9[4] = {0x0f, 0x00, 0x00, 0xea};
patch((void *) 0x6dc70, patch_data_9);
// Change Username
const char *username;
if (is_server) {
// MOTD is Username
username = server_get_motd();
} else {
username = get_username();
fprintf(stderr, "Setting Username: %s\n", username);
}
char **default_username = (char **) 0x18fd4;
if (strcmp(*default_username, "StevePi") != 0) {
ERR("%s", "Default Username Is Invalid");
}
patch_address((void *) default_username, (void *) username);
if (extra_has_feature("Disable Autojump By Default")) {
// Disable Autojump By Default
unsigned char autojump_patch[4] = {0x00, 0x30, 0xa0, 0xe3};
patch((void *) 0x44b90, autojump_patch);
}
if (extra_has_feature("Show Block Outlines")) {
// Show Block Outlines
unsigned char outline_patch[4] = {0x00, 0xf0, 0x20, 0xe3};
patch((void *) 0x4a214, outline_patch);
}
}