func (blob *Blob) saveChunk(key cas.Key, level uint8) (cas.Key, error) {
if !key.IsPrivate() {
// already saved
return key, nil
}
chunk, err := blob.stash.Get(key, blob.m.Type, level)
if err != nil {
return key, err
}
if level > 0 {
for off := uint32(0); off+cas.KeySize <= uint32(len(chunk.Buf)); off += cas.KeySize {
cur := cas.NewKeyPrivate(chunk.Buf[off : off+cas.KeySize])
if cur.IsReserved() {
return key, fmt.Errorf("invalid stored key: key @%d in %v is %v", off, key, chunk.Buf[off:off+cas.KeySize])
}
// recurses at most `level` deep
saved, err := blob.saveChunk(cur, level-1)
if err != nil {
return key, err
}
copy(chunk.Buf[off:off+cas.KeySize], saved.Bytes())
}
}
chunk.Buf = trim(chunk.Buf)
return blob.stash.Save(key)
}
