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package netstring
import (
"errors"
"fmt"
"io"
)
type Encoder struct {
w io.Writer
}
type Decoder struct {
r io.Reader
}
var errBadFormat = errors.New("netstring: bad format")
/*
func Encode(s string) string {
return fmt.Sprintf("%d:%s,", len(s), s)
}
*/
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{w: w}
}
func NewDecoder(r io.Reader) *Decoder {
return &Decoder{r: r}
}
func (e *Encoder) Encode(s string) error {
_, err := fmt.Fprintf(e.w, "%d:%s,", len(s), s)
return err
}
func (d *Decoder) Decode() (out string, err error) {
var n int
_, err = fmt.Fscanf(d.r, "%d:", &n)
if err != nil {
return "", fmt.Errorf("netstring: %w", err)
}
buf := make([]byte, n + 1)
_, err = io.ReadFull(d.r, buf)
if err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return "", fmt.Errorf("netstring: %w", err)
}
if buf[n] != ',' {
return "", errBadFormat
}
return string(buf[:n]), nil
}
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