def decode(cls, frameString):
"""
C{frameString} is a L{StringFragment} that ends with "N".
"""
try:
seqNum = strToNonNegLimit(str(frameString[:-1]), 2**53)
except ValueError:
raise InvalidFrame("bad seqNum")
return cls(seqNum)
def sackStringToSack(sackString):
"""
C{sackString} is a C{str}. Returns a L{window.SACK}.
"""
try:
# If not enough args for split, Python raises ValueError
joinedSackList, ackNumberStr = sackString.rsplit('|', 1)
ackNumber = strToIntInRange(ackNumberStr, -1, 2**53)
sackList = tuple(strToNonNegLimit(s, 2**53) for s in joinedSackList.split(',')) if joinedSackList else ()
except ValueError:
raise InvalidSackString("bad sack")
return SACK(ackNumber, sackList)
def _qidOrThrow(s):
try:
return strToNonNegLimit(s, 2**53)
except ValueError:
raise InvalidQANFrame("bad qid")
def _call(self, s, limit=2**128): return objcheck.strToNonNegLimit(s, limit)