func (r *Reader) readOFSDelta(raw core.Object, steps int64) error {
start := r.r.position
offset, err := decodeOffset(r.r, steps)
if err != nil {
return err
}
buf := bytes.NewBuffer(nil)
if err := r.inflate(buf); err != nil {
return err
}
ref, ok := r.offsets[start+offset]
if !ok {
return PackEntryNotFoundErr.n("offset %d", start+offset)
}
referenced, _ := r.s.Get(ref)
d, _ := ioutil.ReadAll(referenced.Reader())
patched := patchDelta(d, buf.Bytes())
if patched == nil {
return PatchingErr.n("hash %q", ref)
}
raw.SetType(referenced.Type())
raw.SetSize(int64(len(patched)))
raw.Writer().Write(patched)
return nil
}
func (r *Reader) readREFDelta(raw core.Object) error {
var ref core.Hash
if _, err := r.r.Read(ref[:]); err != nil {
return err
}
buf := bytes.NewBuffer(nil)
if err := r.inflate(buf); err != nil {
return err
}
referenced, ok := r.s.Get(ref)
if !ok {
return ObjectNotFoundErr.n("%s", ref)
}
d, _ := ioutil.ReadAll(referenced.Reader())
patched := patchDelta(d, buf.Bytes())
if patched == nil {
return PatchingErr.n("hash %q", ref)
}
raw.SetType(referenced.Type())
raw.SetSize(int64(len(patched)))
raw.Writer().Write(patched)
return nil
}
