// Code generated by 'go generate'; DO NOT EDIT.

package version

import (
	"syscall"
	"unsafe"

	"golang.org/x/sys/windows"
)

var _ unsafe.Pointer

// Do the interface allocations only once for common
// Errno values.
const (
	errnoERROR_IO_PENDING = 997
)

var (
	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
	switch e {
	case 0:
		return nil
	case errnoERROR_IO_PENDING:
		return errERROR_IO_PENDING
	}
	// TODO: add more here, after collecting data on the common
	// error values see on Windows. (perhaps when running
	// all.bat?)
	return e
}

var (
	modntdll   = windows.NewLazySystemDLL("ntdll.dll")
	modversion = windows.NewLazySystemDLL("version.dll")

	procRtlGetVersion           = modntdll.NewProc("RtlGetVersion")
	procGetFileVersionInfoSizeW = modversion.NewProc("GetFileVersionInfoSizeW")
	procGetFileVersionInfoW     = modversion.NewProc("GetFileVersionInfoW")
	procVerQueryValueW          = modversion.NewProc("VerQueryValueW")
)

func rtlGetVersion(versionInfo *OsVersionInfo) (err error) {
	r1, _, e1 := syscall.Syscall(procRtlGetVersion.Addr(), 1, uintptr(unsafe.Pointer(versionInfo)), 0, 0)
	if r1 != 0 {
		if e1 != 0 {
			err = errnoErr(e1)
		} else {
			err = syscall.EINVAL
		}
	}
	return
}

func GetFileVersionInfoSize(filename *uint16, zero *uint32) (size uint32, err error) {
	r0, _, e1 := syscall.Syscall(procGetFileVersionInfoSizeW.Addr(), 2, uintptr(unsafe.Pointer(filename)), uintptr(unsafe.Pointer(zero)), 0)
	size = uint32(r0)
	if size == 0 {
		if e1 != 0 {
			err = errnoErr(e1)
		} else {
			err = syscall.EINVAL
		}
	}
	return
}

func GetFileVersionInfo(filename *uint16, zero uint32, size uint32, block *byte) (err error) {
	r1, _, e1 := syscall.Syscall6(procGetFileVersionInfoW.Addr(), 4, uintptr(unsafe.Pointer(filename)), uintptr(zero), uintptr(size), uintptr(unsafe.Pointer(block)), 0, 0)
	if r1 == 0 {
		if e1 != 0 {
			err = errnoErr(e1)
		} else {
			err = syscall.EINVAL
		}
	}
	return
}

func VerQueryValue(block *byte, section *uint16, value **byte, size *uint32) (err error) {
	r1, _, e1 := syscall.Syscall6(procVerQueryValueW.Addr(), 4, uintptr(unsafe.Pointer(block)), uintptr(unsafe.Pointer(section)), uintptr(unsafe.Pointer(value)), uintptr(unsafe.Pointer(size)), 0, 0)
	if r1 == 0 {
		if e1 != 0 {
			err = errnoErr(e1)
		} else {
			err = syscall.EINVAL
		}
	}
	return
}