<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _detect_xerial_stream(payload):
 """Detects if the data given might have been encoded with the blocking mode of the xerial snappy library. This mode writes a magic header of the format: | Marker | Magic String | Null / Pad | Version | Compat | | byte | c-string | byte | int32 | int32 | | -126 | 'SNAPPY' | \0 | | | The pad appears to be to ensure that SNAPPY is a valid cstring The version is the version of this format as written by xerial, in the wild this is currently 1 as such we only support v1. Compat is there to claim the miniumum supported version that can read a xerial block stream, presently in the wild this is 1. """


    if len(payload) > 16:
        header = struct.unpack('!' + _XERIAL_V1_FORMAT, bytes(payload)[:16])
        return header == _XERIAL_V1_HEADER
    return False