	/**
	BSD 3-Clause License

	Copyright (c) 2019, Odzhan. All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions are met:

	* Redistributions of source code must retain the above copyright notice, this
	list of conditions and the following disclaimer.

	* Redistributions in binary form must reproduce the above copyright notice,
	this list of conditions and the following disclaimer in the documentation
	and/or other materials provided with the distribution.

	* Neither the name of the copyright holder nor the names of its
	contributors may be used to endorse or promote products derived from
	this software without specific prior written permission.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
	FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <windows.h>
	#include <ObjBase.h>
	#include <ActivScp.h>

	#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/stat.h>
	#include <inttypes.h>

	#pragma comment(lib, "oleaut32.lib")
	#pragma comment(lib, "ole32.lib")

	typedef struct {
	IActiveScriptSite site;
	IActiveScriptSiteWindow siteWnd;
	ULONG m_cRef;
	} MyIActiveScriptSite;

	static STDMETHODIMP_(ULONG) AddRef(IActiveScriptSite *this);

	static STDMETHODIMP QueryInterface(IActiveScriptSite this, REFIID riid, void *ppv) {
	MyIActiveScriptSite mas = (MyIActiveScriptSite)this;

	if(ppv == NULL) return E_POINTER;

	// we implement the following interfaces
	if(IsEqualIID(&IID_IUnknown, riid) \|\|
	IsEqualIID(&IID_IActiveScriptSite, riid))
	{
	*ppv = (LPVOID)this;
	AddRef(this);
	return S_OK;
	}
	*ppv = NULL;
	return E_NOINTERFACE;
	}

	static STDMETHODIMP_(ULONG) AddRef(IActiveScriptSite *this) {
	MyIActiveScriptSite mas = (MyIActiveScriptSite)this;

	_InterlockedIncrement(&mas->m_cRef);
	return mas->m_cRef;
	}

	static STDMETHODIMP_(ULONG) Release(IActiveScriptSite *this) {
	MyIActiveScriptSite mas = (MyIActiveScriptSite)this;

	ULONG ulRefCount = _InterlockedDecrement(&mas->m_cRef);
	return ulRefCount;
	}

	static STDMETHODIMP GetItemInfo(IActiveScriptSite *this,
	LPCOLESTR objectName, DWORD dwReturnMask,
	IUnknown objPtr, ITypeInfo ppti)
	{
	return S_OK;
	}

	static STDMETHODIMP OnScriptError(IActiveScriptSite *this,
	IActiveScriptError *scriptError)
	{
	return S_OK;
	}

	static STDMETHODIMP GetLCID(IActiveScriptSite this, LCID plcid) {
	return S_OK;
	}

	static STDMETHODIMP GetDocVersionString(IActiveScriptSite this, BSTR version) {
	return S_OK;
	}

	static STDMETHODIMP OnScriptTerminate(IActiveScriptSite *this,
	const VARIANT pvr, const EXCEPINFO pei)
	{
	return S_OK;
	}

	static STDMETHODIMP OnStateChange(IActiveScriptSite *this, SCRIPTSTATE state) {
	return S_OK;
	}

	static STDMETHODIMP OnEnterScript(IActiveScriptSite *this) {
	return S_OK;
	}

	static STDMETHODIMP OnLeaveScript(IActiveScriptSite *this) {
	return S_OK;
	}

	VOID run_script(PWCHAR lang, PCHAR script) {
	IActiveScriptParse *parser;
	IActiveScript *engine;
	MyIActiveScriptSite mas;
	IActiveScriptSiteVtbl vft;
	LPVOID cs;
	DWORD len;
	CLSID langId;
	HRESULT hr;

	// 1. Initialize IActiveScript based on language
	CLSIDFromProgID(lang, &langId);
	CoInitializeEx(NULL, COINIT_MULTITHREADED);

	CoCreateInstance(
	&langId, 0, CLSCTX_INPROC_SERVER,
	&IID_IActiveScript, (void **)&engine);

	// 2. Query engine for script parser and initialize
	engine->lpVtbl->QueryInterface(
	engine, &IID_IActiveScriptParse,
	(void **)&parser);

	parser->lpVtbl->InitNew(parser);

	// 3. Initialize IActiveScriptSite interface
	vft.QueryInterface = (LPVOID)QueryInterface;
	vft.AddRef = (LPVOID)AddRef;
	vft.Release = (LPVOID)Release;
	vft.GetLCID = (LPVOID)GetLCID;
	vft.GetItemInfo = (LPVOID)GetItemInfo;
	vft.GetDocVersionString = (LPVOID)GetDocVersionString;
	vft.OnScriptTerminate = (LPVOID)OnScriptTerminate;
	vft.OnStateChange = (LPVOID)OnStateChange;
	vft.OnScriptError = (LPVOID)OnScriptError;
	vft.OnEnterScript = (LPVOID)OnEnterScript;
	vft.OnLeaveScript = (LPVOID)OnLeaveScript;

	mas.site.lpVtbl = (IActiveScriptSiteVtbl*)&vft;
	mas.siteWnd.lpVtbl = NULL;
	mas.m_cRef = 0;

	engine->lpVtbl->SetScriptSite(
	engine, (IActiveScriptSite *)&mas);

	// 4. Convert script to unicode and execute
	len = MultiByteToWideChar(CP_ACP, 0, script, -1, NULL, 0);
	cs = malloc(len * sizeof(WCHAR));
	len = MultiByteToWideChar(CP_ACP, 0, script, -1, cs, len * sizeof(WCHAR));

	parser->lpVtbl->ParseScriptText(
	parser, cs, 0, 0, 0, 0, 0, 0, 0, 0);

	engine->lpVtbl->SetScriptState(
	engine, SCRIPTSTATE_CONNECTED);

	// 5. cleanup
	parser->lpVtbl->Release(parser);
	engine->lpVtbl->Close(engine);
	engine->lpVtbl->Release(engine);
	free(cs);
	}

	void read_script(const char path) {
	int i;
	struct stat fs;
	FILE *in;
	void *data;

	// Script is inaccessible? exit
	if(stat(path, &fs) != 0) return NULL;

	// Zero file size? exit
	if(fs.st_size == 0) return NULL;

	// Open script for reading
	in = fopen(path, "rb");
	if(in == NULL) return NULL;

	// allocate memory for script
	data = calloc(fs.st_size, sizeof(char));
	if(data != NULL) {
	fread(data, sizeof(char), fs.st_size, in);
	}
	fclose(in);
	return data;
	}

	int main(int argc, char *argv[]) {
	char path, ext;
	void *script;
	wchar_t *lang;

	if(argc != 2) {
	printf("usage: runscript <VBS \| JS>\n");
	return 0;
	}

	path = argv[1];

	// assign correct language id depending on extension
	ext = strrchr(path, '.');

	if(!strcmpi(ext, ".js")) lang = L"JScript";
	if(!strcmpi(ext, ".vbs")) lang = L"VBScript";
	if(lang == NULL) {
	printf("Uncognized extension.\n");
	return 0;
	}
	script = read_script(path);
	if(script == NULL) {
	printf("Unable to read file.\n");
	return 0;
	}
	run_script(lang, script);
	return 0;
	}