75 def CalcSize(fmt):  argument
76   if "A" in fmt:
77     fmt = fmt.replace("A", "s")
78   return struct.calcsize(fmt)
80 def CalcNumElements(fmt):  argument
81   prevlen = len(fmt)
82   fmt = fmt.replace("S", "")
83   numstructs = prevlen - len(fmt)
84   size = CalcSize(fmt)
85   elements = struct.unpack(fmt, "\x00" * size)
89 def Struct(name, fmt, fieldnames, substructs={}):  argument
121     for i in xrange(len(fmt)):
122       if fmt[i] == "S":
124         index = CalcNumElements(fmt[:i])
128       elif fmt[i] == "A":
130         index = CalcNumElements(fmt[:i])
135         _format += fmt[i]
154                        % (fmt, numfields, fieldnames, len(_fieldnames)))