minecraft-pi-reborn/mods/src/extra.c

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#include <stdint.h>
#include <stdio.h>
#include <libcore/libcore.h>
static int32_t get_game_type(__attribute__((unused)) int32_t level_data) {
return 0;
}
static uint32_t can_spawn_mobs(__attribute__((unused)) int32_t obj) {
return 1;
}
#include <SDL/SDL_mouse.h>
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 = 0;
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
int using_item = SDL_GetMouseState(NULL, NULL) & SDL_BUTTON(SDL_BUTTON_RIGHT);
if (!using_item) {
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);
}
}
}
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typedef void (*tickItemDrop_t)(unsigned char *);
static tickItemDrop_t tickItemDrop = (tickItemDrop_t) 0x27778;
static void *tickItemDrop_original = NULL;
#include <SDL/SDL_events.h>
static void tickItemDrop_injection(unsigned char *this) {
if (SDL_ShowCursor(SDL_QUERY) == SDL_ENABLE) {
revert_overwrite((void *) tickItemDrop, tickItemDrop_original);
(*tickItemDrop)(this);
revert_overwrite((void *) tickItemDrop, tickItemDrop_original);
}
}
typedef void (*handleClick_t)(unsigned char *, unsigned char *, unsigned char *, unsigned char *);
static handleClick_t handleClick = (handleClick_t) 0x2599c;
static void *handleClick_original = NULL;
static void 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 *) handleClick, handleClick_original);
(*handleClick)(this, param_2, param_3, param_4);
revert_overwrite((void *) handleClick, handleClick_original);
}
}
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static int has_feature(const char *name) {
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char *env = getenv("MCPI_FEATURES");
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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;
}
// Defined In extra.cpp
extern void readAssetFile(unsigned char *target, unsigned char *app_platform, unsigned char *path);
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__attribute__((constructor)) static void init() {
if (has_feature("Touch GUI")) {
// Use Touch UI
unsigned char patch_data[4] = {0x01, 0x00, 0x50, 0xe3};
patch((void *) 0x292fc, patch_data);
}
is_survival = has_feature("Survival Mode");
if (is_survival) {
// Survival Mode Inventpry UI
unsigned char patch_data_2[4] = {0x00, 0x30, 0xa0, 0xe3};
patch((void *) 0x16efc, patch_data_2);
// Replace Creative Mode VTable With Survival Mode VTable
patch((void *) 0x1a0d8, (unsigned char *) 0x1b804);
// Use Correct Size For Survival Mode Object
unsigned char patch_data_3[4] = {0x24, 0x00, 0xa0, 0xe3};
patch((void *) 0x1a054, patch_data_3);
// Force GameType To 0 (Required For Day-Night Cycle)
overwrite((void *) 0xbabdc, get_game_type);
}
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// Disable Item Dropping When Cursor Is Hidden
tickItemDrop_original = overwrite((void *) tickItemDrop, tickItemDrop_injection);
// Disable Opening Inventory Using The Cursor When Cursor Is Hidden
handleClick_original = overwrite((void *) handleClick, handleClick_injection);
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if (has_feature("Fix Bow & Arrow")) {
// Fix Bow
handle_input_original = overwrite((void *) handle_input, handle_input_injection);
}
if (has_feature("Fix Attacking")) {
// Allow Attacking Mobs
unsigned char patch_data_6[4] = {0x00, 0xf0, 0x20, 0xe3};
patch((void *) 0x162d4, patch_data_6);
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}
if (has_feature("Mob Spawning")) {
// Enable Mob Spawning
overwrite((void *) 0xbabec, can_spawn_mobs);
}
// 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);
// Implement AppPlatform::readAssetFile So Translations Work
overwrite((void *) 0x12b10, readAssetFile);
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}