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

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#include <vector>
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#include <libreborn/libreborn.h>
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#include <symbols/minecraft.h>
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#include <mods/init/init.h>
#include <mods/feature/feature.h>
#include <mods/input/input.h>
#include <mods/sign/sign.h>
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// Open Sign Screen
static void LocalPlayer_openTextEdit_injection(unsigned char *local_player, unsigned char *sign) {
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if (*(int32_t *) (sign + TileEntity_id_property_offset) == 4) {
unsigned char *minecraft = *(unsigned char **) (local_player + LocalPlayer_minecraft_property_offset);
unsigned char *screen = (unsigned char *) ::operator new(TEXT_EDIT_SCREEN_SIZE);
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ALLOC_CHECK(screen);
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screen = (*TextEditScreen)(screen, sign);
(*Minecraft_setScreen)(minecraft, screen);
}
}
#define BACKSPACE_KEY 8
static int is_valid_key(char key) {
return (key >= 32 && key <= 126) || key == BACKSPACE_KEY;
}
// Store Text Input
std::vector<char> input;
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void sign_key_press(char key) {
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if (is_valid_key(key)) {
input.push_back(key);
}
}
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static void clear_input(__attribute__((unused)) unsigned char *minecraft) {
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input.clear();
}
// Handle Text Input
static void TextEditScreen_updateEvents_injection(unsigned char *screen) {
// Call Original Method
(*Screen_updateEvents)(screen);
if (*(char *)(screen + 4) == '\0') {
unsigned char *vtable = *(unsigned char **) screen;
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for (char key : input) {
if (key == BACKSPACE_KEY) {
// Handle Backspace
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(*(Screen_keyPressed_t *) (vtable + Screen_keyPressed_vtable_offset))(screen, BACKSPACE_KEY);
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} else {
// Handle Normal Key
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(*(Screen_keyboardNewChar_t *) (vtable + Screen_keyboardNewChar_vtable_offset))(screen, key);
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}
}
}
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clear_input(NULL);
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}
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// Init
void init_sign() {
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if (feature_has("Fix Sign Placement", server_disabled)) {
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// Fix Signs
patch_address(LocalPlayer_openTextEdit_vtable_addr, (void *) LocalPlayer_openTextEdit_injection);
patch_address(TextEditScreen_updateEvents_vtable_addr, (void *) TextEditScreen_updateEvents_injection);
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// Clear input On Input Tick
input_run_on_tick(clear_input);
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}
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}