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# iMelody helpersMAX_SMS_LENGTH = 140TYPE_MELODY = chr(0x0C)MELODY_HEADER_LENGTH = 30UDH_HEADER_LENGTH = 4def encode_melody(imelody_descriptor):    result = []    imelody_source = ''.join(imelody_descriptor.splitlines())    if len(imelody_source) + MELODY_HEADER_LENGTH + UDH_HEADER_LENGTH > MAX_SMS_LENGTH:        imelody_source = imelody_source[0: MAX_SMS_LENGTH - MELODY_HEADER_LENGTH - UDH_HEADER_LENGTH]    gpos = 0    for i in ('1', '2', '3', '4', '5', '6'):        pos = imelody_source.rfind(i)        if pos > gpos:            gpos = pos    imelody_source = imelody_source[0:gpos]    imelody_source = "'BEGIN:IMELODY\r\n" + imelody_source + "\r\nEND:IMELODY\r\n"    imelody_length = len(imelody_source)    result.append(str2binhex(chr(imelody_length + 3) + TYPE_MELODY + chr(imelody_length +1) + chr(00) + imelody_source))   def str2binhex(source):    result = ''    for c in source:        result += result + "%.2x" % ord(c)