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Copy pathfunctions.cpp
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238 lines (175 loc) · 6.72 KB
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#include <Windows.h>
#include <iostream>
#include <jvmti.h>
#include <jni.h>
#include <string>
#include <winuser.h>
#include "functions.h"
#include "dllmain.h"
using namespace std;
static string PREFIX = "§8[§aEssentialPatcher§8] §7";
jmethodID findclass_md;
jobject classloader_obj;
jint JNICALL heapCallback(
jlong class_tag,
jlong size,
jlong *tag_ptr,
jint length,
void *user_data)
{
*tag_ptr = 1;
return JVMTI_VISIT_OBJECTS;
}
jobject get_essential_classloader()
{
jclass relaunchLoader = get_env()->FindClass("gg/essential/loader/stage2/relaunch/RelaunchClassLoader");
if (relaunchLoader == NULL)
{
printf("Couldn't find RelaunchClassLoader.\n");
return NULL;
}
jvmtiHeapCallbacks callbacks = {};
callbacks.heap_iteration_callback = heapCallback;
get_jvmti()->IterateThroughHeap(
0,
relaunchLoader,
&callbacks,
NULL);
jlong tags = 1;
jint count;
jobject *instances;
get_jvmti()->GetObjectsWithTags(
1,
&tags,
&count,
&instances,
NULL);
jobject target = instances[0];
get_jvmti()->Deallocate((unsigned char *)instances);
jmethodID rl_findclass_md = get_env()->GetMethodID(relaunchLoader, "findClass", "(Ljava/lang/String;)Ljava/lang/Class;");
jstring launchwrapper = get_env()->NewStringUTF("net.minecraft.launchwrapper.LaunchClassLoader");
jclass launchwrapper_cls = reinterpret_cast<jclass>(get_env()->CallObjectMethod(target, rl_findclass_md, launchwrapper));
jstring launch = get_env()->NewStringUTF("net.minecraft.launchwrapper.Launch");
jclass launch_cls = reinterpret_cast<jclass>(get_env()->CallObjectMethod(target, rl_findclass_md, launch));
jfieldID classloader_fid = get_env()->GetStaticFieldID(launch_cls, "classLoader", "Lnet/minecraft/launchwrapper/LaunchClassLoader;");
jobject classloader_obj = get_env()->NewGlobalRef(get_env()->GetStaticObjectField(launch_cls, classloader_fid));
get_env()->DeleteLocalRef(launchwrapper_cls);
get_env()->DeleteLocalRef(launch_cls);
get_env()->DeleteLocalRef(launchwrapper);
get_env()->DeleteLocalRef(launch);
return classloader_obj;
}
void override_normal_with_essential()
{
jobject essentialClassloader = get_essential_classloader();
if (essentialClassloader == NULL)
{
printf("Couldn't find Essential classloader.\n");
return;
}
jclass launch_cls = get_env()->FindClass("net/minecraft/launchwrapper/Launch");
jfieldID classloader_fid = get_env()->GetStaticFieldID(launch_cls, "classLoader", "Lnet/minecraft/launchwrapper/LaunchClassLoader;");
get_env()->SetStaticObjectField(launch_cls, classloader_fid, essentialClassloader);
get_env()->DeleteLocalRef(launch_cls);
}
bool using_essential()
{
return get_env()->FindClass("gg/essential/loader/stage2/relaunch/RelaunchClassLoader") != NULL;
}
/* Minecraft Functions */
inline jclass find_class(const char *name)
{
jstring jname = get_env()->NewStringUTF(name);
jclass cls = reinterpret_cast<jclass>(get_env()->CallObjectMethod(classloader_obj, findclass_md, jname));
get_env()->DeleteLocalRef(jname);
return cls;
}
void set_launchwrapper_essential()
{
jclass relaunchLoader = get_env()->FindClass("gg/essential/loader/stage2/relaunch/RelaunchClassLoader");
if (relaunchLoader == NULL)
{
printf("Couldn't find loader\n");
return;
}
jvmtiHeapCallbacks callbacks = {};
callbacks.heap_iteration_callback = heapCallback;
get_jvmti()->IterateThroughHeap(
0,
relaunchLoader,
&callbacks,
NULL);
jlong tags = 1;
jint count;
jobject *instances;
get_jvmti()->GetObjectsWithTags(
1,
&tags,
&count,
&instances,
NULL);
jobject target = instances[0];
get_jvmti()->Deallocate((unsigned char *)instances);
jmethodID rl_findclass_md = get_env()->GetMethodID(relaunchLoader, "findClass", "(Ljava/lang/String;)Ljava/lang/Class;");
jstring launchwrapper = get_env()->NewStringUTF("net.minecraft.launchwrapper.LaunchClassLoader");
jclass launchwrapper_cls = reinterpret_cast<jclass>(get_env()->CallObjectMethod(target, rl_findclass_md, launchwrapper));
jstring launch = get_env()->NewStringUTF("net.minecraft.launchwrapper.Launch");
jclass launch_cls = reinterpret_cast<jclass>(get_env()->CallObjectMethod(target, rl_findclass_md, launch));
auto classloader_fid = get_env()->GetStaticFieldID(launch_cls, "classLoader", "Lnet/minecraft/launchwrapper/LaunchClassLoader;");
findclass_md = get_env()->GetMethodID(launchwrapper_cls, "findClass", "(Ljava/lang/String;)Ljava/lang/Class;");
classloader_obj = get_env()->NewGlobalRef(get_env()->GetStaticObjectField(launch_cls, classloader_fid));
get_env()->DeleteLocalRef(launchwrapper_cls);
get_env()->DeleteLocalRef(launch_cls);
get_env()->DeleteLocalRef(launchwrapper);
get_env()->DeleteLocalRef(launch);
}
void set_launchwrapper_normal()
{
jclass launchwrapper_cls = get_env()->FindClass("net/minecraft/launchwrapper/LaunchClassLoader");
jclass launch_cls = get_env()->FindClass("net/minecraft/launchwrapper/Launch");
auto classloader_fid = get_env()->GetStaticFieldID(launch_cls, "classLoader", "Lnet/minecraft/launchwrapper/LaunchClassLoader;");
findclass_md = get_env()->GetMethodID(launchwrapper_cls, "findClass", "(Ljava/lang/String;)Ljava/lang/Class;");
classloader_obj = get_env()->NewGlobalRef(get_env()->GetStaticObjectField(launch_cls, classloader_fid));
get_env()->DeleteLocalRef(launchwrapper_cls);
get_env()->DeleteLocalRef(launch_cls);
}
void get_launchwrapper()
{
if (using_essential())
set_launchwrapper_essential();
else
set_launchwrapper_normal();
}
jobject get_minecraft()
{
jobject res;
auto cls = find_class("net.minecraft.client.Minecraft");
auto mc_fid = get_env()->GetStaticMethodID(cls, "func_71410_x", "()Lnet/minecraft/client/Minecraft;");
res = get_env()->CallStaticObjectMethod(cls, mc_fid);
get_env()->DeleteLocalRef(cls);
return res;
}
jobject get_player(jobject mc)
{
jobject res;
auto cls = find_class("net.minecraft.client.Minecraft");
auto player_fid = get_env()->GetFieldID(cls, "field_71439_g", "Lnet/minecraft/client/entity/EntityPlayerSP;");
res = get_env()->GetObjectField(mc, player_fid);
get_env()->DeleteLocalRef(cls);
return res;
}
void send_chat(jobject player, const char *msg, bool prefix)
{
auto epsp_cls = find_class("net.minecraft.client.entity.EntityPlayerSP");
auto send_chat_fid = get_env()->GetMethodID(epsp_cls, "func_145747_a", "(Lnet/minecraft/util/IChatComponent;)V");
auto msg_cls = find_class("net.minecraft.util.ChatComponentText");
auto msg_fid = get_env()->GetMethodID(msg_cls, "<init>", "(Ljava/lang/String;)V");
jstring message = get_env()->NewStringUTF(msg);
if (prefix)
message = get_env()->NewStringUTF((PREFIX + msg).c_str());
auto msg_obj = get_env()->NewObject(msg_cls, msg_fid, message);
get_env()->CallVoidMethod(player, send_chat_fid, msg_obj);
get_env()->DeleteLocalRef(epsp_cls);
get_env()->DeleteLocalRef(msg_cls);
get_env()->DeleteLocalRef(msg_obj);
}