Synnefo

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            if not exists(blockpath):

                makedirs(blockpath)

            else:

        hashtype = params['hashtype']

        try:

                if not rbl:

                    break

                for block in rbl.sync_read_chunks(blocksize, 1, 0):

            if not block:

                break

            append(self._pad(block))

        block = self.block_retr((blkhash,))

        if not block:

            return None, None

        block = block[0]

        newblock = block[:offset] + data

        if len(newblock) > blocksize:

            sextend(sl)

            lastsize = len(block)

        return size, hashlist, storedlist