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package pktline
import (
"errors"
"fmt"
"strings"
)
var (
//ErrOverflow happends when the line length exceed the MaxLength
ErrOverflow = errors.New("unexpected string length (overflow)")
)
// Encoder implements a pkt-line format encoder
type Encoder struct {
lines []string
}
// NewEncoder returns a new Encoder
func NewEncoder() *Encoder {
return &Encoder{make([]string, 0)}
}
// AddLine encode and adds a line to the encoder
func (e *Encoder) AddLine(line string) error {
le, err := EncodeFromString(line + "\n")
if err != nil {
return err
}
e.lines = append(e.lines, le)
return nil
}
// AddFlush adds a flush-pkt to the encoder
func (e *Encoder) AddFlush() {
e.lines = append(e.lines, "0000")
}
// Reader returns a string.Reader over the encoder
func (e *Encoder) Reader() *strings.Reader {
data := strings.Join(e.lines, "")
return strings.NewReader(data)
}
// EncodeFromString encodes a string to pkt-line format
func EncodeFromString(line string) (string, error) {
return Encode([]byte(line))
}
// Encode encodes a byte slice to pkt-line format
func Encode(line []byte) (string, error) {
if line == nil {
return "0000", nil
}
l := len(line) + HeaderLength
if l > MaxLength {
return "", ErrOverflow
}
return fmt.Sprintf("%04x%s", l, line), nil
}
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