// Decode reads from an io.Reader, presumably a packed refs file, and parses
// all the refs within it, ignoring comments and whitespace.
func (p *PackedRefs) Decode(reader io.Reader) error {
r := bufio.NewReader(reader)
atEof := false
for !atEof {
line, err := r.ReadString('\n')
if err == io.EOF {
atEof = true
} else if err != nil {
return err
}
if pound := strings.IndexRune(line, '#'); pound != -1 {
line = line[:pound]
}
line = strings.TrimSpace(line)
if line == "" {
continue
}
parts := strings.SplitN(line, " ", 2)
sha1, name := parts[0], parts[1]
hash, err := core.Sha1FromString(sha1)
if err != nil {
return err
}
p.Refs = append(p.Refs, Ref{Sha1: hash, Name: name})
}
return nil
}
// Decode reads from a an io.Reader, presumably a loose ref file, and extracts
// the SHA-1 that is supposed to be in the file. If the file does not contain a
// properly formatted SHA-1 checksum, the error ErrInvalidRef is returned.
func (ref *Ref) Decode(reader io.Reader) error {
r := bufio.NewReader(reader)
if line, err := r.ReadString('\n'); err != nil {
return err
} else if len(line) != 41 {
return ErrInvalidRef
} else {
if sha1, err := core.Sha1FromString(line[:]); err != nil {
return ErrInvalidRef
} else {
ref.Sha1 = sha1
}
}
return nil
}