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package packp
import (
"bytes"
"fmt"
"io"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/format/pktline"
)
const (
shallowLineLen = 48
unshallowLineLen = 50
)
type ShallowUpdate struct {
Shallows []plumbing.Hash
Unshallows []plumbing.Hash
}
func (r *ShallowUpdate) Decode(reader io.Reader) error {
s := pktline.NewScanner(reader)
for s.Scan() {
line := s.Bytes()
line = bytes.TrimSpace(line)
var err error
switch {
case bytes.HasPrefix(line, shallow):
err = r.decodeShallowLine(line)
case bytes.HasPrefix(line, unshallow):
err = r.decodeUnshallowLine(line)
case bytes.Equal(line, pktline.Flush):
return nil
}
if err != nil {
return err
}
}
return s.Err()
}
func (r *ShallowUpdate) decodeShallowLine(line []byte) error {
hash, err := r.decodeLine(line, shallow, shallowLineLen)
if err != nil {
return err
}
r.Shallows = append(r.Shallows, hash)
return nil
}
func (r *ShallowUpdate) decodeUnshallowLine(line []byte) error {
hash, err := r.decodeLine(line, unshallow, unshallowLineLen)
if err != nil {
return err
}
r.Unshallows = append(r.Unshallows, hash)
return nil
}
func (r *ShallowUpdate) decodeLine(line, prefix []byte, expLen int) (plumbing.Hash, error) {
if len(line) != expLen {
return plumbing.ZeroHash, fmt.Errorf("malformed %s%q", prefix, line)
}
raw := string(line[expLen-40 : expLen])
return plumbing.NewHash(raw), nil
}
func (r *ShallowUpdate) Encode(w io.Writer) error {
e := pktline.NewEncoder(w)
for _, h := range r.Shallows {
if err := e.Encodef("%s%s\n", shallow, h.String()); err != nil {
return err
}
}
for _, h := range r.Unshallows {
if err := e.Encodef("%s%s\n", unshallow, h.String()); err != nil {
return err
}
}
return e.Flush()
}
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