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package netascii
// TODO: make it work not only on linux
import "io"
const (
CR = '\x0d'
LF = '\x0a'
NUL = '\x00'
)
func ToReader(r io.Reader) io.Reader {
return &toReader{
r: r,
buf: make([]byte, 256),
}
}
type toReader struct {
r io.Reader
buf []byte
n int
i int
err error
lf bool
nul bool
}
func (r *toReader) Read(p []byte) (int, error) {
var n int
for n < len(p) {
if r.lf {
p[n] = LF
n++
r.lf = false
continue
}
if r.nul {
p[n] = NUL
n++
r.nul = false
continue
}
if r.i < r.n {
if r.buf[r.i] == LF {
p[n] = CR
r.lf = true
} else if r.buf[r.i] == CR {
p[n] = CR
r.nul = true
} else {
p[n] = r.buf[r.i]
}
r.i++
n++
continue
}
if r.err == nil {
r.n, r.err = r.r.Read(r.buf)
r.i = 0
} else {
return n, r.err
}
}
return n, r.err
}
type fromWriter struct {
w io.Writer
buf []byte
i int
cr bool
}
func FromWriter(w io.Writer) io.Writer {
return &fromWriter{
w: w,
buf: make([]byte, 256),
}
}
func (w *fromWriter) Write(p []byte) (n int, err error) {
for n < len(p) {
if w.cr {
if p[n] == LF {
w.buf[w.i] = LF
}
if p[n] == NUL {
w.buf[w.i] = CR
}
w.cr = false
w.i++
} else if p[n] == CR {
w.cr = true
} else {
w.buf[w.i] = p[n]
w.i++
}
n++
if w.i == len(w.buf) || n == len(p) {
_, err = w.w.Write(w.buf[:w.i])
w.i = 0
}
}
return n, err
}
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