osdk.py 文件源码

def write_body(self, f):
        checksum = 0

        for segment, meta in self.segments.items():
            data = pack(
                '<2IH2B20s',
                segment,
                meta['incremental'],
                meta['base'],
                meta['encryption'],
                meta['compression'],
                meta['sha1_hash']
            )

            f.write(data)
            checksum = crc32(data, checksum)

        """ Backfill the body_checksum """
        f.seek(24, 0)
        f.write(pack('<I', checksum))