package win32api

import (
	"fmt"
	"syscall"
	"unsafe"
)

func WTSGetActiveConsoleSessionId() (DWORD, error) {
	WTGet, err := getProcAddr("kernel32.dll", "WTSGetActiveConsoleSessionId")
	if err != nil {
		return 0, err
	}
	res, _, _ := syscall.Syscall(WTGet, 0, 0, 0, 0)
	return DWORD(res), nil
}

func CloseHandle(hObject HANDLE) error {
	CH, err := getProcAddr("kernel32.dll", "CloseHandle")
	if err != nil {
		return err
	}
	if r, _, errno := syscall.Syscall(CH, 1, uintptr(hObject), 0, 0); r == 0 {
		return error(errno)
	}
	return nil
}

func GetLastError() DWORD {
	last := syscall.GetLastError()
	if last == nil {
		return 0
	}
	if errno, ok := last.(syscall.Errno); ok {
		return DWORD(errno)
	}
	return 0
}

func SetLastError(dwErrCode DWORD) error {
	proc, err := getProcAddr("kernel32.dll", "SetLastError")
	if err != nil {
		return err
	}
	syscall.Syscall(proc, 1, uintptr(dwErrCode), 0, 0)
	return nil
}

func FormatMessage(dwMessageId DWORD) (string, error) {
	proc, err := getProcAddr("kernel32.dll", "FormatMessageW")
	if err != nil {
		return "", err
	}

	buf := make([]uint16, 2048)
	flags := FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS
	r, _, errno := syscall.Syscall9(proc, 7,
		uintptr(flags),
		0,
		uintptr(dwMessageId),
		0,
		uintptr(unsafe.Pointer(&buf[0])),
		uintptr(len(buf)),
		0,
		0,
		0,
	)
	if r == 0 {
		if errno != 0 {
			return "", error(errno)
		}
		return "", syscall.EINVAL
	}
	return syscall.UTF16ToString(buf[:r]), nil
}

func CreateToolhelp32Snapshot(dwFlags, th32ProcessID DWORD) (HANDLE, error) {
	CTS, err := getProcAddr("kernel32.dll", "CreateToolhelp32Snapshot")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall(CTS, 2, uintptr(dwFlags), uintptr(th32ProcessID), 0)
	if int(r) == -1 {
		return HANDLE(r), error(errno)
	}
	return HANDLE(r), nil
}

func Process32First(hSnapshot HANDLE, lppe *PROCESSENTRY32) error {
	PN, err := getProcAddr("kernel32.dll", "Process32First")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(PN, 2, uintptr(hSnapshot), uintptr(unsafe.Pointer(lppe)), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func Process32Next(hSnapshot HANDLE, lppe *PROCESSENTRY32) error {
	PN, err := getProcAddr("kernel32.dll", "Process32Next")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(PN, 2, uintptr(hSnapshot), uintptr(unsafe.Pointer(lppe)), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func Thread32First(hSnapshot HANDLE, lpte *THREADENTRY32) error {
	proc, err := getProcAddr("kernel32.dll", "Thread32First")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 2, uintptr(hSnapshot), uintptr(unsafe.Pointer(lpte)), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func Thread32Next(hSnapshot HANDLE, lpte *THREADENTRY32) error {
	proc, err := getProcAddr("kernel32.dll", "Thread32Next")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 2, uintptr(hSnapshot), uintptr(unsafe.Pointer(lpte)), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func Module32First(hSnapshot HANDLE, lpme *MODULEENTRY32W) error {
	proc, err := getProcAddr("kernel32.dll", "Module32FirstW")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 2, uintptr(hSnapshot), uintptr(unsafe.Pointer(lpme)), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func Module32Next(hSnapshot HANDLE, lpme *MODULEENTRY32W) error {
	proc, err := getProcAddr("kernel32.dll", "Module32NextW")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 2, uintptr(hSnapshot), uintptr(unsafe.Pointer(lpme)), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func OpenThread(dwDesiredAccess DWORD, bInheritHandle bool, dwThreadID DWORD) (HANDLE, error) {
	proc, err := getProcAddr("kernel32.dll", "OpenThread")
	if err != nil {
		return 0, err
	}

	inherit := uintptr(0)
	if bInheritHandle {
		inherit = 1
	}

	r, _, errno := syscall.Syscall(proc, 3, uintptr(dwDesiredAccess), inherit, uintptr(dwThreadID))
	if r == 0 {
		if errno != 0 {
			return 0, error(errno)
		}
		return 0, syscall.EINVAL
	}
	return HANDLE(r), nil
}

func SuspendThread(hThread HANDLE) (DWORD, error) {
	proc, err := getProcAddr("kernel32.dll", "SuspendThread")
	if err != nil {
		return 0, err
	}

	r, _, errno := syscall.Syscall(proc, 1, uintptr(hThread), 0, 0)
	result := DWORD(r)
	if result == 0xFFFFFFFF {
		if errno != 0 {
			return result, error(errno)
		}
		return result, syscall.EINVAL
	}
	return result, nil
}

func ResumeThread(hThread HANDLE) (DWORD, error) {
	proc, err := getProcAddr("kernel32.dll", "ResumeThread")
	if err != nil {
		return 0, err
	}

	r, _, errno := syscall.Syscall(proc, 1, uintptr(hThread), 0, 0)
	result := DWORD(r)
	if result == 0xFFFFFFFF {
		if errno != 0 {
			return result, error(errno)
		}
		return result, syscall.EINVAL
	}
	return result, nil
}

func GetThreadContext(hThread HANDLE, lpContext unsafe.Pointer) error {
	if lpContext == nil {
		return syscall.EINVAL
	}
	proc, err := getProcAddr("kernel32.dll", "GetThreadContext")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 2, uintptr(hThread), uintptr(lpContext), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func SetThreadContext(hThread HANDLE, lpContext unsafe.Pointer) error {
	if lpContext == nil {
		return syscall.EINVAL
	}
	proc, err := getProcAddr("kernel32.dll", "SetThreadContext")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 2, uintptr(hThread), uintptr(lpContext), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func DebugActiveProcess(dwProcessId DWORD) error {
	proc, err := getProcAddr("kernel32.dll", "DebugActiveProcess")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 1, uintptr(dwProcessId), 0, 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func DebugActiveProcessStop(dwProcessId DWORD) error {
	proc, err := getProcAddr("kernel32.dll", "DebugActiveProcessStop")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 1, uintptr(dwProcessId), 0, 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func WaitForDebugEvent(lpDebugEvent unsafe.Pointer, dwMilliseconds DWORD) error {
	if lpDebugEvent == nil {
		return syscall.EINVAL
	}
	proc, err := getProcAddr("kernel32.dll", "WaitForDebugEvent")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 2, uintptr(lpDebugEvent), uintptr(dwMilliseconds), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func ContinueDebugEvent(dwProcessId, dwThreadId, dwContinueStatus DWORD) error {
	proc, err := getProcAddr("kernel32.dll", "ContinueDebugEvent")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 3, uintptr(dwProcessId), uintptr(dwThreadId), uintptr(dwContinueStatus))
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func DebugEventCodeName(code DWORD) string {
	switch code {
	case EXCEPTION_DEBUG_EVENT:
		return "EXCEPTION_DEBUG_EVENT"
	case CREATE_THREAD_DEBUG_EVENT:
		return "CREATE_THREAD_DEBUG_EVENT"
	case CREATE_PROCESS_DEBUG_EVENT:
		return "CREATE_PROCESS_DEBUG_EVENT"
	case EXIT_THREAD_DEBUG_EVENT:
		return "EXIT_THREAD_DEBUG_EVENT"
	case EXIT_PROCESS_DEBUG_EVENT:
		return "EXIT_PROCESS_DEBUG_EVENT"
	case LOAD_DLL_DEBUG_EVENT:
		return "LOAD_DLL_DEBUG_EVENT"
	case UNLOAD_DLL_DEBUG_EVENT:
		return "UNLOAD_DLL_DEBUG_EVENT"
	case OUTPUT_DEBUG_STRING_EVENT:
		return "OUTPUT_DEBUG_STRING_EVENT"
	case RIP_EVENT:
		return "RIP_EVENT"
	default:
		return fmt.Sprintf("UNKNOWN_DEBUG_EVENT(%d)", code)
	}
}

func DecodeDebugEvent(raw []byte) (DebugEventInfo, error) {
	if len(raw) < int(unsafe.Sizeof(DEBUG_EVENT_HEADER{})) {
		return DebugEventInfo{}, syscall.EINVAL
	}
	header := *(*DEBUG_EVENT_HEADER)(unsafe.Pointer(&raw[0]))
	return DebugEventInfo{
		Header:   header,
		CodeName: DebugEventCodeName(header.DwDebugEventCode),
	}, nil
}

func WaitForDebugEventInfo(raw []byte, dwMilliseconds DWORD) (DebugEventInfo, error) {
	if len(raw) == 0 {
		return DebugEventInfo{}, syscall.EINVAL
	}
	if err := WaitForDebugEvent(unsafe.Pointer(&raw[0]), dwMilliseconds); err != nil {
		return DebugEventInfo{}, err
	}
	return DecodeDebugEvent(raw)
}

func CreateRemoteThread(hProcess HANDLE, lpThreadAttributes *syscall.SecurityAttributes, dwStackSize uintptr, lpStartAddress uintptr, lpParameter uintptr, dwCreationFlags DWORD, lpThreadID *DWORD) (HANDLE, error) {
	proc, err := getProcAddr("kernel32.dll", "CreateRemoteThread")
	if err != nil {
		return 0, err
	}

	r, _, errno := syscall.Syscall9(
		proc,
		7,
		uintptr(hProcess),
		uintptr(unsafe.Pointer(lpThreadAttributes)),
		dwStackSize,
		lpStartAddress,
		lpParameter,
		uintptr(dwCreationFlags),
		uintptr(unsafe.Pointer(lpThreadID)),
		0,
		0,
	)
	if r == 0 {
		if errno != 0 {
			return 0, error(errno)
		}
		return 0, syscall.EINVAL
	}
	return HANDLE(r), nil
}

func GetProcessId(Process HANDLE) uint32 {
	GPI, err := getProcAddr("kernel32.dll", "GetProcessId")
	if err != nil {
		return 0
	}
	r, _, _ := syscall.Syscall(GPI, 1, uintptr(Process), 0, 0)
	return uint32(r)
}

func ProcessIdToSessionId(dwProcessId DWORD) (DWORD, error) {
	proc, err := getProcAddr("kernel32.dll", "ProcessIdToSessionId")
	if err != nil {
		return 0, err
	}
	var sessionID DWORD
	r, _, errno := syscall.Syscall(proc, 2, uintptr(dwProcessId), uintptr(unsafe.Pointer(&sessionID)), 0)
	if r == 0 {
		if errno != 0 {
			return 0, error(errno)
		}
		return 0, syscall.EINVAL
	}
	return sessionID, nil
}

func ReadProcessMemory(hProcess HANDLE, lpBaseAddress uintptr, lpBuffer []byte, lpNumberOfBytesRead *uintptr) error {
	proc, err := getProcAddr("kernel32.dll", "ReadProcessMemory")
	if err != nil {
		return err
	}

	var bufferPtr uintptr
	if len(lpBuffer) > 0 {
		bufferPtr = uintptr(unsafe.Pointer(&lpBuffer[0]))
	}

	r, _, errno := syscall.Syscall6(
		proc,
		5,
		uintptr(hProcess),
		lpBaseAddress,
		bufferPtr,
		uintptr(len(lpBuffer)),
		uintptr(unsafe.Pointer(lpNumberOfBytesRead)),
		0,
	)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func WriteProcessMemory(hProcess HANDLE, lpBaseAddress uintptr, lpBuffer []byte, lpNumberOfBytesWritten *uintptr) error {
	proc, err := getProcAddr("kernel32.dll", "WriteProcessMemory")
	if err != nil {
		return err
	}

	var bufferPtr uintptr
	if len(lpBuffer) > 0 {
		bufferPtr = uintptr(unsafe.Pointer(&lpBuffer[0]))
	}

	r, _, errno := syscall.Syscall6(
		proc,
		5,
		uintptr(hProcess),
		lpBaseAddress,
		bufferPtr,
		uintptr(len(lpBuffer)),
		uintptr(unsafe.Pointer(lpNumberOfBytesWritten)),
		0,
	)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func VirtualQueryEx(hProcess HANDLE, lpAddress uintptr, lpBuffer *MEMORY_BASIC_INFORMATION, dwLength uintptr) (uintptr, error) {
	if lpBuffer == nil {
		return 0, syscall.EINVAL
	}
	proc, err := getProcAddr("kernel32.dll", "VirtualQueryEx")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall6(
		proc,
		4,
		uintptr(hProcess),
		lpAddress,
		uintptr(unsafe.Pointer(lpBuffer)),
		dwLength,
		0,
		0,
	)
	if r == 0 {
		if errno != 0 {
			return 0, error(errno)
		}
		return 0, syscall.EINVAL
	}
	return r, nil
}

func VirtualProtectEx(hProcess HANDLE, lpAddress uintptr, dwSize uintptr, flNewProtect DWORD, lpflOldProtect *DWORD) error {
	if lpflOldProtect == nil {
		return syscall.EINVAL
	}
	proc, err := getProcAddr("kernel32.dll", "VirtualProtectEx")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall6(
		proc,
		5,
		uintptr(hProcess),
		lpAddress,
		dwSize,
		uintptr(flNewProtect),
		uintptr(unsafe.Pointer(lpflOldProtect)),
		0,
	)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func VirtualAllocEx(hProcess HANDLE, lpAddress uintptr, dwSize uintptr, flAllocationType, flProtect DWORD) (uintptr, error) {
	proc, err := getProcAddr("kernel32.dll", "VirtualAllocEx")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall6(
		proc,
		5,
		uintptr(hProcess),
		lpAddress,
		dwSize,
		uintptr(flAllocationType),
		uintptr(flProtect),
		0,
	)
	if r == 0 {
		if errno != 0 {
			return 0, error(errno)
		}
		return 0, syscall.EINVAL
	}
	return r, nil
}

func VirtualFreeEx(hProcess HANDLE, lpAddress uintptr, dwSize uintptr, dwFreeType DWORD) error {
	proc, err := getProcAddr("kernel32.dll", "VirtualFreeEx")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall6(
		proc,
		4,
		uintptr(hProcess),
		lpAddress,
		dwSize,
		uintptr(dwFreeType),
		0,
		0,
	)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func OpenProcess(dwDesiredAccess DWORD, bInheritHandle bool, dwProcessId DWORD) (HANDLE, error) {
	proc, err := getProcAddr("kernel32.dll", "OpenProcess")
	if err != nil {
		return 0, err
	}
	inherit := uintptr(0)
	if bInheritHandle {
		inherit = 1
	}
	r, _, errno := syscall.Syscall(proc, 3, uintptr(dwDesiredAccess), inherit, uintptr(dwProcessId))
	if r == 0 {
		if errno != 0 {
			return 0, error(errno)
		}
		return 0, syscall.EINVAL
	}
	return HANDLE(r), nil
}

func TerminateProcess(hProcess HANDLE, uExitCode DWORD) error {
	proc, err := getProcAddr("kernel32.dll", "TerminateProcess")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 2, uintptr(hProcess), uintptr(uExitCode), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func CreateProcess(lpApplicationName, lpCommandLine string,
	lpProcessAttributes, lpThreadAttributes *syscall.SecurityAttributes, bInheritHandles bool,
	dwCreationFlags DWORD, lpEnvironment HANDLE, lpCurrentDirectory string,
	lpStartupInfo *StartupInfo, lpProcessInformation *ProcessInformation) error {
	proc, err := getProcAddr("kernel32.dll", "CreateProcessW")
	if err != nil {
		return err
	}

	var applicationName uintptr
	if len(lpApplicationName) > 0 {
		applicationName = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpApplicationName)))
	}

	var commandLine uintptr
	if len(lpCommandLine) > 0 {
		commandLine = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpCommandLine)))
	}

	var currentDirectory uintptr
	if len(lpCurrentDirectory) > 0 {
		currentDirectory = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpCurrentDirectory)))
	}

	inheritHandles := uintptr(0)
	if bInheritHandles {
		inheritHandles = 1
	}

	r, _, errno := syscall.Syscall12(proc, 10,
		applicationName,
		commandLine,
		uintptr(unsafe.Pointer(lpProcessAttributes)),
		uintptr(unsafe.Pointer(lpThreadAttributes)),
		inheritHandles,
		uintptr(dwCreationFlags),
		uintptr(lpEnvironment),
		currentDirectory,
		uintptr(unsafe.Pointer(lpStartupInfo)),
		uintptr(unsafe.Pointer(lpProcessInformation)),
		0,
		0,
	)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func WaitForSingleObject(hHandle HANDLE, dwMilliseconds DWORD) (DWORD, error) {
	proc, err := getProcAddr("kernel32.dll", "WaitForSingleObject")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall(proc, 2, uintptr(hHandle), uintptr(dwMilliseconds), 0)
	result := DWORD(r)
	if result == WAIT_FAILED {
		if errno != 0 {
			return result, error(errno)
		}
		return result, syscall.EINVAL
	}
	return result, nil
}

func WaitForMultipleObjects(handles []HANDLE, bWaitAll bool, dwMilliseconds DWORD) (DWORD, error) {
	if len(handles) == 0 {
		return WAIT_FAILED, fmt.Errorf("handles must not be empty")
	}
	if len(handles) > int(MAXIMUM_WAIT_OBJECTS) {
		return WAIT_FAILED, fmt.Errorf("too many handles: %d > %d", len(handles), MAXIMUM_WAIT_OBJECTS)
	}

	proc, err := getProcAddr("kernel32.dll", "WaitForMultipleObjects")
	if err != nil {
		return 0, err
	}
	waitAll := uintptr(0)
	if bWaitAll {
		waitAll = 1
	}
	r, _, errno := syscall.Syscall6(proc, 4,
		uintptr(len(handles)),
		uintptr(unsafe.Pointer(&handles[0])),
		waitAll,
		uintptr(dwMilliseconds),
		0,
		0,
	)
	result := DWORD(r)
	if result == WAIT_FAILED {
		if errno != 0 {
			return result, error(errno)
		}
		return result, syscall.EINVAL
	}
	return result, nil
}

func GetExitCodeProcess(hProcess HANDLE) (DWORD, error) {
	proc, err := getProcAddr("kernel32.dll", "GetExitCodeProcess")
	if err != nil {
		return 0, err
	}
	var code DWORD
	r, _, errno := syscall.Syscall(proc, 2, uintptr(hProcess), uintptr(unsafe.Pointer(&code)), 0)
	if r == 0 {
		if errno != 0 {
			return 0, error(errno)
		}
		return 0, syscall.EINVAL
	}
	return code, nil
}

func GetTickCount() (uint32, error) {
	GTC, err := getProcAddr("kernel32.dll", "GetTickCount")
	if err != nil {
		return 0, err
	}
	r, _, _ := syscall.Syscall(GTC, 0, 0, 0, 0)
	return uint32(r), nil
}

func GlobalMemoryStatusEx(data *MEMORYSTATUSEX) (bool, error) {
	(*data).DwLength = DWORD(unsafe.Sizeof(*data))
	GMS, err := getProcAddr("kernel32.dll", "GlobalMemoryStatusEx")
	if err != nil {
		return false, err
	}
	r, _, errno := syscall.Syscall(GMS, 1, uintptr(unsafe.Pointer(data)), 0, 0)
	if r == 0 {
		if errno != 0 {
			return false, error(errno)
		}
		return false, syscall.EINVAL
	}
	return true, nil
}

func LockFileEx(hFile HANDLE, dwFlags DWORD, dwReserved DWORD, nNumberOfBytesToLockLow DWORD,
	nNumberOfBytesToLockHigh DWORD, lpOverlapped *syscall.Overlapped) (bool, error) {
	Lck, err := getProcAddr("kernel32.dll", "LockFileEx")
	if err != nil {
		return false, err
	}
	r, _, errno := syscall.Syscall6(Lck, 6, uintptr(hFile), uintptr(dwFlags), uintptr(dwReserved),
		uintptr(nNumberOfBytesToLockLow), uintptr(nNumberOfBytesToLockHigh), uintptr(unsafe.Pointer(lpOverlapped)))
	if r == 0 {
		if errno != 0 {
			return false, error(errno)
		}
		return false, syscall.EINVAL
	}
	return true, nil
}

func OpenFileById(hVolumeHint HANDLE, lpFileId *FILE_ID_DESCRIPTOR, dwDesiredAccess DWORD, dwShareMode DWORD,
	lpSecurityAttributes *syscall.SecurityAttributes, dwFlagsAndAttributes DWORD) (HANDLE, error) {
	ofb, err := getProcAddr("kernel32.dll", "OpenFileById")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall6(ofb, 6, uintptr(hVolumeHint),
		uintptr(unsafe.Pointer(lpFileId)), uintptr(dwDesiredAccess), uintptr(dwShareMode),
		uintptr(unsafe.Pointer(lpSecurityAttributes)), uintptr(dwFlagsAndAttributes))
	if HANDLE(r) == HANDLE(syscall.InvalidHandle) {
		if errno != 0 {
			return HANDLE(r), error(errno)
		}
		return HANDLE(r), syscall.EINVAL
	}
	return HANDLE(r), nil
}

func CreateEventW(lpEventAttributes *syscall.SecurityAttributes, bManualReset bool,
	bInitialState bool, lpName LPCWSTR) (HANDLE, error) {
	var intBManualReset, intBInitialState int
	if bManualReset {
		intBManualReset = 1
	}
	if bInitialState {
		intBInitialState = 1
	}
	Lck, err := getProcAddr("kernel32.dll", "CreateEventW")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall6(Lck, 4, uintptr(unsafe.Pointer(lpEventAttributes)),
		uintptr(intBManualReset), uintptr(intBInitialState), uintptr(unsafe.Pointer(lpName)), 0, 0)
	if HANDLE(r) == 0 {
		if errno != 0 {
			return HANDLE(r), error(errno)
		}
		return HANDLE(r), syscall.EINVAL
	}
	return HANDLE(r), nil
}

func GetLogicalDriveStringsW(nBufferLength DWORD, lpBuffer LPWSTR) error {
	glds, err := getProcAddr("kernel32.dll", "GetLogicalDriveStringsW")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(glds, 2, uintptr(nBufferLength), uintptr(unsafe.Pointer(lpBuffer)), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func GetVolumeInformationW(lpRootPathName LPCWSTR, lpVolumeNameBuffer LPWSTR, nVolumeNameSize DWORD,
	lpVolumeSerialNumber LPDWORD, lpMaximumComponentLength LPDWORD, lpFileSystemFlags LPDWORD,
	lpFileSystemNameBuffer LPWSTR, nFileSystemNameSize DWORD) error {
	glds, err := getProcAddr("kernel32.dll", "GetVolumeInformationW")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall9(glds, 8, uintptr(unsafe.Pointer(lpRootPathName)),
		uintptr(unsafe.Pointer(lpVolumeNameBuffer)), uintptr(nVolumeNameSize), uintptr(unsafe.Pointer(lpVolumeSerialNumber)),
		uintptr(unsafe.Pointer(lpMaximumComponentLength)), uintptr(unsafe.Pointer(lpFileSystemFlags)),
		uintptr(unsafe.Pointer(lpFileSystemNameBuffer)), uintptr(nFileSystemNameSize), 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func DeviceIoControl(hDevice HANDLE, dwIoControlCode DWORD, lpInBuffer LPVOID, nInBufferSize DWORD, lpOutBuffer LPVOID,
	nOutBufferSize DWORD, lpBytesReturned LPDWORD, lpOverlapped *syscall.Overlapped) (bool, error) {
	dic, err := getProcAddr("kernel32.dll", "DeviceIoControl")
	if err != nil {
		return false, err
	}
	r, _, errno := syscall.Syscall9(dic, 8, uintptr(hDevice), uintptr(dwIoControlCode),
		uintptr(unsafe.Pointer(lpInBuffer)), uintptr(nInBufferSize), uintptr(unsafe.Pointer(lpOutBuffer)), uintptr(nOutBufferSize),
		uintptr(unsafe.Pointer(lpBytesReturned)), uintptr(unsafe.Pointer(lpOverlapped)), 0)
	if r == 0 {
		if errno != 0 {
			return false, error(errno)
		} else {
			return false, syscall.EINVAL
		}
	}
	return true, nil
}

func DeviceIoControlPtr(hDevice HANDLE, dwIoControlCode DWORD, lpInBuffer uintptr, nInBufferSize DWORD, lpOutBuffer uintptr,
	nOutBufferSize DWORD, lpBytesReturned LPDWORD, lpOverlapped *syscall.Overlapped) (bool, error) {
	dic, err := getProcAddr("kernel32.dll", "DeviceIoControl")
	if err != nil {
		return false, err
	}
	r, _, errno := syscall.Syscall9(dic, 8, uintptr(hDevice), uintptr(dwIoControlCode),
		lpInBuffer, uintptr(nInBufferSize), lpOutBuffer, uintptr(nOutBufferSize),
		uintptr(unsafe.Pointer(lpBytesReturned)), uintptr(unsafe.Pointer(lpOverlapped)), 0)
	if r == 0 {
		if errno != 0 {
			return false, error(errno)
		} else {
			return false, syscall.EINVAL
		}
	}
	return true, nil
}

func GlobalLock(hMem HGLOBAL) (unsafe.Pointer, error) {
	gl, err := getProcAddr("kernel32.dll", "GlobalLock")
	if err != nil {
		return nil, err
	}
	r, _, errno := syscall.Syscall(gl, 1, uintptr(hMem), 0, 0)
	if r == 0 {
		if errno != 0 {
			return nil, error(errno)
		}
		return nil, syscall.EINVAL
	}
	return unsafe.Pointer(r), nil
}

func GlobalUnlock(hMem HGLOBAL) error {
	gu, err := getProcAddr("kernel32.dll", "GlobalUnlock")
	if err != nil {
		return err
	}
	if err := SetLastError(0); err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(gu, 1, uintptr(hMem), 0, 0)
	if r == 0 {
		if errno == 0 {
			return nil
		}
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func GlobalSize(hMem HGLOBAL) (DWORD, error) {
	gs, err := getProcAddr("kernel32.dll", "GlobalSize")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall(gs, 1, uintptr(hMem), 0, 0)
	if r == 0 {
		if errno != 0 {
			return 0, error(errno)
		}
		return 0, syscall.EINVAL
	}
	return DWORD(r), nil
}

func GlobalAlloc(uFlags DWORD, dwBytes uintptr) (HGLOBAL, error) {
	ga, err := getProcAddr("kernel32.dll", "GlobalAlloc")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall(ga, 2, uintptr(uFlags), dwBytes, 0)
	if r == 0 {
		if errno != 0 {
			return 0, error(errno)
		}
		return 0, syscall.EINVAL
	}
	return HGLOBAL(r), nil
}

func GlobalFree(hMem HGLOBAL) error {
	gf, err := getProcAddr("kernel32.dll", "GlobalFree")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(gf, 1, uintptr(hMem), 0, 0)
	if r != 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func RtlMoveMemory(Destination, Source unsafe.Pointer, Length uintptr) error {
	rmv, err := getProcAddr("kernel32.dll", "RtlMoveMemory")
	if err != nil {
		return err
	}
	syscall.Syscall(rmv, 3, uintptr(unsafe.Pointer(Destination)), uintptr(unsafe.Pointer(Source)), Length)
	return nil
}

func GetModuleHandle(lpModuleName *uint16) (HINSTANCE, error) {
	proc, err := getProcAddr("kernel32.dll", "GetModuleHandleW")
	if err != nil {
		return 0, err
	}
	r, _, err := syscall.Syscall(proc, 1, uintptr(unsafe.Pointer(lpModuleName)), 0, 0)
	if r == 0 {
		return 0, err
	}
	return HINSTANCE(r), nil
}

func GetCurrentProcessId() DWORD {
	proc, err := getProcAddr("kernel32.dll", "GetCurrentProcessId")
	if err != nil {
		return 0
	}
	r, _, _ := syscall.Syscall(proc, 0, 0, 0, 0)
	return DWORD(r)
}

func GetCurrentThreadId() DWORD {
	proc, err := getProcAddr("kernel32.dll", "GetCurrentThreadId")
	if err != nil {
		return 0
	}
	r, _, _ := syscall.Syscall(proc, 0, 0, 0, 0)
	return DWORD(r)
}

func GetComputerName() (string, error) {
	proc, err := getProcAddr("kernel32.dll", "GetComputerNameW")
	if err != nil {
		return "", err
	}

	size := uint32(64)
	for {
		buf := make([]uint16, size)
		n := uint32(len(buf))
		r, _, errno := syscall.Syscall(proc, 2, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0)
		if r != 0 {
			return syscall.UTF16ToString(buf), nil
		}
		if errno == syscall.ERROR_MORE_DATA || errno == syscall.ERROR_INSUFFICIENT_BUFFER {
			if n > size {
				size = n
			} else {
				size *= 2
			}
			continue
		}
		if errno != 0 {
			return "", error(errno)
		}
		return "", syscall.EINVAL
	}
}

func GetTempPath() (string, error) {
	proc, err := getProcAddr("kernel32.dll", "GetTempPathW")
	if err != nil {
		return "", err
	}

	size := uint32(syscall.MAX_PATH + 1)
	for {
		buf := make([]uint16, size)
		r, _, errno := syscall.Syscall(proc, 2, uintptr(size), uintptr(unsafe.Pointer(&buf[0])), 0)
		if r == 0 {
			if errno != 0 {
				return "", error(errno)
			}
			return "", syscall.EINVAL
		}

		needed := uint32(r)
		if needed < size {
			return syscall.UTF16ToString(buf[:needed]), nil
		}
		size = needed + 1
	}
}

func GetSystemDirectory() (string, error) {
	proc, err := getProcAddr("kernel32.dll", "GetSystemDirectoryW")
	if err != nil {
		return "", err
	}

	size := uint32(syscall.MAX_PATH + 1)
	for {
		buf := make([]uint16, size)
		r, _, errno := syscall.Syscall(proc, 2, uintptr(unsafe.Pointer(&buf[0])), uintptr(size), 0)
		if r == 0 {
			if errno != 0 {
				return "", error(errno)
			}
			return "", syscall.EINVAL
		}
		needed := uint32(r)
		if needed < size {
			return syscall.UTF16ToString(buf[:needed]), nil
		}
		size = needed + 1
	}
}

func GetWindowsDirectory() (string, error) {
	proc, err := getProcAddr("kernel32.dll", "GetWindowsDirectoryW")
	if err != nil {
		return "", err
	}

	size := uint32(syscall.MAX_PATH + 1)
	for {
		buf := make([]uint16, size)
		r, _, errno := syscall.Syscall(proc, 2, uintptr(unsafe.Pointer(&buf[0])), uintptr(size), 0)
		if r == 0 {
			if errno != 0 {
				return "", error(errno)
			}
			return "", syscall.EINVAL
		}
		needed := uint32(r)
		if needed < size {
			return syscall.UTF16ToString(buf[:needed]), nil
		}
		size = needed + 1
	}
}

func QueryFullProcessImageName(hProcess HANDLE, dwFlags DWORD) (string, error) {
	proc, err := getProcAddr("kernel32.dll", "QueryFullProcessImageNameW")
	if err != nil {
		return "", err
	}

	size := uint32(syscall.MAX_PATH + 1)
	for {
		buf := make([]uint16, size)
		n := size
		r, _, errno := syscall.Syscall6(proc, 4,
			uintptr(hProcess),
			uintptr(dwFlags),
			uintptr(unsafe.Pointer(&buf[0])),
			uintptr(unsafe.Pointer(&n)),
			0,
			0,
		)
		if r != 0 {
			return syscall.UTF16ToString(buf[:n]), nil
		}
		if errno == syscall.ERROR_INSUFFICIENT_BUFFER {
			size *= 2
			if size > 32768 {
				return "", fmt.Errorf("query full process image name buffer overflow")
			}
			continue
		}
		if errno != 0 {
			return "", error(errno)
		}
		return "", syscall.EINVAL
	}
}

func CreateFile(lpFileName string, dwDesiredAccess, dwShareMode DWORD,
	lpSecurityAttributes *syscall.SecurityAttributes, dwCreationDisposition, dwFlagsAndAttributes DWORD,
	hTemplateFile HANDLE) (HANDLE, error) {
	proc, err := getProcAddr("kernel32.dll", "CreateFileW")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall9(proc, 7,
		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpFileName))),
		uintptr(dwDesiredAccess),
		uintptr(dwShareMode),
		uintptr(unsafe.Pointer(lpSecurityAttributes)),
		uintptr(dwCreationDisposition),
		uintptr(dwFlagsAndAttributes),
		uintptr(hTemplateFile),
		0,
		0,
	)
	handle := HANDLE(r)
	if handle == HANDLE(syscall.InvalidHandle) {
		if errno != 0 {
			return handle, error(errno)
		}
		return handle, syscall.EINVAL
	}
	return handle, nil
}

func ReadFile(hFile HANDLE, lpBuffer []byte, lpNumberOfBytesRead *DWORD, lpOverlapped *syscall.Overlapped) error {
	proc, err := getProcAddr("kernel32.dll", "ReadFile")
	if err != nil {
		return err
	}

	var bufferPtr uintptr
	if len(lpBuffer) > 0 {
		bufferPtr = uintptr(unsafe.Pointer(&lpBuffer[0]))
	}
	r, _, errno := syscall.Syscall6(proc, 5,
		uintptr(hFile),
		bufferPtr,
		uintptr(len(lpBuffer)),
		uintptr(unsafe.Pointer(lpNumberOfBytesRead)),
		uintptr(unsafe.Pointer(lpOverlapped)),
		0,
	)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func WriteFile(hFile HANDLE, lpBuffer []byte, lpNumberOfBytesWritten *DWORD, lpOverlapped *syscall.Overlapped) error {
	proc, err := getProcAddr("kernel32.dll", "WriteFile")
	if err != nil {
		return err
	}

	var bufferPtr uintptr
	if len(lpBuffer) > 0 {
		bufferPtr = uintptr(unsafe.Pointer(&lpBuffer[0]))
	}
	r, _, errno := syscall.Syscall6(proc, 5,
		uintptr(hFile),
		bufferPtr,
		uintptr(len(lpBuffer)),
		uintptr(unsafe.Pointer(lpNumberOfBytesWritten)),
		uintptr(unsafe.Pointer(lpOverlapped)),
		0,
	)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func DeleteFile(path string) error {
	proc, err := getProcAddr("kernel32.dll", "DeleteFileW")
	if err != nil {
		return err
	}
	r, _, errno := syscall.Syscall(proc, 1, uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))), 0, 0)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func CopyFile(existingFileName, newFileName string, bFailIfExists bool) error {
	proc, err := getProcAddr("kernel32.dll", "CopyFileW")
	if err != nil {
		return err
	}
	failIfExists := uintptr(0)
	if bFailIfExists {
		failIfExists = 1
	}
	r, _, errno := syscall.Syscall(proc, 3,
		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(existingFileName))),
		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(newFileName))),
		failIfExists,
	)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func GetFileAttributes(path string) (DWORD, error) {
	proc, err := getProcAddr("kernel32.dll", "GetFileAttributesW")
	if err != nil {
		return 0, err
	}
	r, _, errno := syscall.Syscall(proc, 1, uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))), 0, 0)
	attr := DWORD(r)
	if attr == INVALID_FILE_ATTRIBUTES {
		if errno != 0 {
			return attr, error(errno)
		}
		return attr, syscall.EINVAL
	}
	return attr, nil
}

func MoveFileEx(existingFileName, newFileName string, dwFlags DWORD) error {
	proc, err := getProcAddr("kernel32.dll", "MoveFileExW")
	if err != nil {
		return err
	}

	var newFilePtr uintptr
	if len(newFileName) > 0 {
		newFilePtr = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(newFileName)))
	}
	r, _, errno := syscall.Syscall(proc, 3,
		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(existingFileName))),
		newFilePtr,
		uintptr(dwFlags),
	)
	if r == 0 {
		if errno != 0 {
			return error(errno)
		}
		return syscall.EINVAL
	}
	return nil
}

func GetFullPathName(path string) (string, error) {
	proc, err := getProcAddr("kernel32.dll", "GetFullPathNameW")
	if err != nil {
		return "", err
	}

	size := uint32(syscall.MAX_PATH + 1)
	for {
		buf := make([]uint16, size)
		r, _, errno := syscall.Syscall6(proc, 4,
			uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),
			uintptr(size),
			uintptr(unsafe.Pointer(&buf[0])),
			0,
			0,
			0,
		)
		if r == 0 {
			if errno != 0 {
				return "", error(errno)
			}
			return "", syscall.EINVAL
		}

		needed := uint32(r)
		if needed < size {
			return syscall.UTF16ToString(buf[:needed]), nil
		}
		size = needed + 1
	}
}