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|
package pack
import (
"encoding/binary"
"fmt"
"io"
)
type Reader interface {
io.Reader
io.ByteReader
}
type Encoder struct {
w io.Writer
}
type Decoder struct {
r Reader
}
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{w: w}
}
func NewDecoder(r Reader) *Decoder {
return &Decoder{r: r}
}
func (e *Encoder) Lps(b []byte) error {
buf := make([]byte, binary.MaxVarintLen64)
n := binary.PutUvarint(buf, uint64(len(b)))
if _, err := e.w.Write(buf[:n]); err != nil {
return err
}
_, err := e.w.Write(b)
return err
}
func (d *Decoder) Lps() ([]byte, error) {
if n, err := binary.ReadUvarint(d.r); err != nil {
return nil, fmt.Errorf("lps: %w", err)
} else {
buf := make([]byte, n)
if _, err := io.ReadFull(d.r, buf); err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return nil, fmt.Errorf("lps: %w", err)
}
return buf, nil
}
}
|
