// MaskOut masks the output stream forWrites.
//
// WARNING! This uses os pipes, so kernel buffering may cut the tail!
func MaskOut(out *os.File, enc encoding.Encoding) (*os.File, error) {
pr, pw, err := os.Pipe()
if err != nil {
return out, err
}
iohlp.SetDirect(pr)
iohlp.SetDirect(pw)
// pw -> pr -> out
go func() {
defer out.Close()
io.Copy(text.NewWriter(out, enc), pr)
}()
return pw, nil
}
// MaskIn masks the input stream for Reads.
func MaskIn(in *os.File, enc encoding.Encoding) (*os.File, error) {
pr, pw, err := os.Pipe()
if err != nil {
return in, err
}
iohlp.SetDirect(pr)
iohlp.SetDirect(pw)
// in -> pw -> pr
go func() {
defer in.Close()
io.Copy(pw, text.NewReader(in, enc))
}()
return pr, nil
}