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

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#include <string>
#include <fstream>
#include <streambuf>
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#include <vector>
#include <unistd.h>
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#include <libcore/libcore.h>
#include "extra.h"
extern "C" {
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static std::string readAssetFile(__attribute__((unused)) unsigned char *obj, const std::string& path) {
std::string full_path("./data/");
full_path.append(path.c_str());
std::ifstream stream(full_path);
std::string str((std::istreambuf_iterator<char>(stream)), std::istreambuf_iterator<char>());
return str;
}
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typedef unsigned char *(*TextEditScreen_t)(unsigned char *, unsigned char *);
static TextEditScreen_t TextEditScreen = (TextEditScreen_t) 0x3a840;
typedef void (*setScreen_t)(unsigned char *, unsigned char *);
static setScreen_t setScreen = (setScreen_t) 0x15d6c;
static void openTextEdit(unsigned char *local_player, unsigned char *sign) {
if (*(int *)(sign + 0x18) == 4) {
unsigned char *minecraft = *(unsigned char **) (local_player + 0xc90);
unsigned char *screen = (unsigned char *) ::operator new(0xd0);
screen = (*TextEditScreen)(screen, sign);
(*setScreen)(minecraft, screen);
}
}
#define BACKSPACE_KEY 8
static int is_valid_key(char key) {
return (key >= 32 && key <= 126) || key == BACKSPACE_KEY;
}
std::vector<char> input;
int count = 0;
void key_press(char key) {
if (is_valid_key(key)) {
// Keys Are Sent Twice
if (count > 0) {
count = 0;
} else {
input.push_back(key);
count++;
}
}
}
void clear_input() {
input.clear();
}
typedef void (*updateEvents_t)(unsigned char *screen);
static updateEvents_t updateEvents = (updateEvents_t) 0x28eb8;
static void *updateEvents_original = NULL;
typedef void (*keyboardNewChar_t)(unsigned char *screen, char key);
typedef void (*keyPressed_t)(unsigned char *screen, int32_t key);
static void updateEvents_injection(unsigned char *screen) {
// Call Original
revert_overwrite((void *) updateEvents, updateEvents_original);
(*updateEvents)(screen);
revert_overwrite((void *) updateEvents, updateEvents_original);
if (*(char *)(screen + 4) == '\0') {
uint32_t vtable = *((uint32_t *) screen);
for (char key : input) {
if (key == BACKSPACE_KEY) {
// Handle Backspace
(*(keyPressed_t *) (vtable + 0x6c))(screen, BACKSPACE_KEY);
} else {
// Handle Nrmal Key
(*(keyboardNewChar_t *) (vtable + 0x70))(screen, key);
}
}
}
clear_input();
}
__attribute((constructor)) static void init() {
// Implement AppPlatform::readAssetFile So Translations Work
overwrite((void *) 0x12b10, (void *) readAssetFile);
if (has_feature("Fix Sign Placement")) {
// Fix Signs
patch_address((void *) 0x106460, (void *) openTextEdit);
updateEvents_original = overwrite((void *) updateEvents, (void *) updateEvents_injection);
}
}
}