func bodyDiff(win *acme.Win, ffile string) (bool, error) {
tf, err := os.Open(ffile)
if err != nil {
return false, err
}
defer tf.Close()
win.Seek("body", 0, 0)
fr := bufio.NewReader(tf)
br := bufio.NewReader(&bodyReader{win})
for {
fb, errf := fr.ReadByte()
if errf != nil && errf != io.EOF {
return false, errf
}
bb, errb := br.ReadByte()
if errb != nil && errb != io.EOF {
return false, errb
}
if fb != bb {
return true, nil
}
if errf == io.EOF && errb == io.EOF {
return false, nil
}
}
}
