private boolean isSame(File a, BlobData b) throws IOException {
ByteSource supplierA = Files.asByteSource(a);
// ByteSource supplierB = ByteStreams.asByteSource(b);
return supplierA.contentEquals(b);
}
@Override
public Iterable<ByteString> listWithPrefix(String prefix) throws IOException {
List<ByteString> ret = Lists.newArrayList();