Minecraft Forums

#include <jni.h>
#include <dlfcn.h>
#include <android/log.h>
#include <stdlib.h>
#include <Substrate.h>
#include <string>
#include <map>

class Item {
public:
 static Item* items[512];
};
class Minecraft;
class LevelSettings;
static void (*Minecraft_selectLevel_real)(Minecraft*, std::string const&, std::string const&, LevelSettings const&);
static void(*Item_item)(Item*, int);
static void(*Item_setIcon)(Item*, std::string const&, int);
static void(*Item_setDescriptionId)(Item*, std::string const&);
std::map <std::string, std::string>* I18n_strings;
static void(*Item_setMaxStackSize)(Item*, int);
static Item* createItem(int id, std::string name, std::string icon, int addTextures, int maxStackSize) {
 Item* newItem=(Item*) ::operator new((std::size_t) 76);
 Item_item(newItem, id-0x100);
 Item_setIcon(newItem, icon, addTextures);
 Item_setDescriptionId(newItem, name);
 (*I18n_strings)["item."+name+".name"]=name;
 Item_setMaxStackSize(newItem, maxStackSize);
 Item::items[id]=newItem;
 return newItem;
}
static void Minecraft_selectLevel_hook(Minecraft* mc, std::string const& str1, std::string const& str2, LevelSettings const& settings) {
 createItem(500, "Test", "stick", 0, 1);
 Minecraft_selectLevel_real(mc, str1, str2, settings);
}
JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
 void* Minecraft_selectLevel = dlsym(RTLD_DEFAULT, "_ZN9Minecraft11selectLevelERKSsS1_RK13LevelSettings");
 Item_item=(void(*)(Item*, int)) dlsym(RTLD_DEFAULT, "_ZN4ItemC2Ei");
 Item_setIcon=(void(*)(Item*, std::string const&, int)) dlsym(RTLD_DEFAULT, "_ZN4Item7setIconERKSsi");
 Item_setDescriptionId=(void(*)(Item*, std::string const&)) dlsym(RTLD_DEFAULT, "_ZN4Item16setDescriptionIdERKSs");
 I18n_strings = (std::map <std::string, std::string>*) dlsym(RTLD_DEFAULT, "_ZN4I18n8_stringsE");
 Item_setMaxStackSize=(void(*)(Item*, int)) dlsym(RTLD_DEFAULT, "_ZN4Item15setMaxStackSizeEi");
 MSHookFunction(Minecraft_selectLevel, (void*) &Minecraft_selectLevel_hook, (void**) &Minecraft_selectLevel_real);
 return JNI_VERSION_1_2;
}