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// Package windows is a collection of types native to Windows platforms but
// are useful on non-Windows platforms.
package windows
// Taken from golang.org/x/sys/windows
const offset int64 = 116444736000000000
// Filetime mirrors the Windows FILETIME structure which represents time
// as the number of 100-nanosecond intervals that have elapsed since
// 00:00:00 UTC, January 1, 1601. This code is taken from the
// golang.org/x/sys/windows package where it's not available for non-Windows
// platforms however various file formats and protocols pass this structure
// about so it's useful to have it available for interoperability purposes.
type Filetime struct {
LowDateTime uint32
HighDateTime uint32
}
// Nanoseconds returns Filetime ft in nanoseconds
// since Epoch (00:00:00 UTC, January 1, 1970).
func (ft *Filetime) Nanoseconds() int64 {
// 100-nanosecond intervals since January 1, 1601
nsec := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime)
// change starting time to the Epoch (00:00:00 UTC, January 1, 1970)
nsec -= offset
// convert into nanoseconds
nsec *= 100
return nsec
}
// NsecToFiletime converts nanoseconds to the equivalent Filetime type.
func NsecToFiletime(nsec int64) (ft Filetime) {
// convert into 100-nanosecond
nsec /= 100
// change starting time to January 1, 1601
nsec += offset
// split into high / low
ft.LowDateTime = uint32(nsec & 0xffffffff)
ft.HighDateTime = uint32(nsec >> 32 & 0xffffffff)
return ft
}
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