// Checksum returns the checksum of the packfile
func (s *Scanner) Checksum() (plumbing.Hash, error) {
err := s.discardObjectIfNeeded()
if err != nil {
return plumbing.ZeroHash, err
}
return binary.ReadHash(s.r)
}
// NextObjectHeader returns the ObjectHeader for the next object in the reader
func (s *Scanner) NextObjectHeader() (*ObjectHeader, error) {
if err := s.doPending(); err != nil {
return nil, err
}
s.crc.Reset()
h := &ObjectHeader{}
s.pendingObject = h
var err error
h.Offset, err = s.r.Seek(0, io.SeekCurrent)
if err != nil {
return nil, err
}
h.Type, h.Length, err = s.readObjectTypeAndLength()
if err != nil {
return nil, err
}
switch h.Type {
case plumbing.OFSDeltaObject:
no, err := binary.ReadVariableWidthInt(s.r)
if err != nil {
return nil, err
}
h.OffsetReference = h.Offset - no
case plumbing.REFDeltaObject:
var err error
h.Reference, err = binary.ReadHash(s.r)
if err != nil {
return nil, err
}
}
return h, nil
}