def check_frame(self):
"""
Check if the next frame is available. Return True if we were
successful.
"""
try:
self.populate_header()
frame_size = self.header['len']
data = self.buffer[:frame_size - 2]
crc = self.buffer[frame_size - 2:frame_size]
crc_val = (crc[0] << 8) + crc[1]
return check_crc(data, crc_val)
except (IndexError, KeyError):
return False
def check_frame(self):
"""
Check if the next frame is available. Return True if we were
successful.
"""
try:
self.populate_header()
frame_size = self.header['len']
data = self.buffer[:frame_size - 2]
crc = self.buffer[frame_size - 2:frame_size]
crc_val = (crc[0] << 8) + crc[1]
return check_crc(data, crc_val)
except (IndexError, KeyError):
return False
def check_frame(self):
""" Check and decode the next frame
:returns: True if we are successful, False otherwise
"""
start = self.buffer.find(self.__start)
if start == -1:
return False
if start > 0: # go ahead and skip old bad data
self.buffer = self.buffer[start:]
end = self.buffer.find(self.__end)
if end != -1:
self.header['len'] = end
self.header['uid'] = struct.unpack('>B', self.buffer[1:2])
self.header['crc'] =\
struct.unpack('>H', self.buffer[end - 2:end])[0]
data = self.buffer[start + 1:end - 2]
return check_crc(data, self.header['crc'])
return False
def check_frame(self):
""" Check and decode the next frame
:returns: True if we are successful, False otherwise
"""
start = self.buffer.find(self.__start)
if start == -1:
return False
if start > 0: # go ahead and skip old bad data
self.buffer = self.buffer[start:]
end = self.buffer.find(self.__end)
if end != -1:
self.header['len'] = end
self.header['uid'] = struct.unpack('>B', self.buffer[1:2])
self.header['crc'] =\
struct.unpack('>H', self.buffer[end - 2:end])[0]
data = self.buffer[start + 1:end - 2]
return check_crc(data, self.header['crc'])
return False
def test_cyclic_redundancy_check(self):
""" Test the cyclic redundancy check code """
self.assertTrue(check_crc(self.data, 0xe2db))
self.assertTrue(check_crc(self.string, 0x889e))
def test_cyclic_redundancy_check(self):
""" Test the cyclic redundancy check code """
self.assertTrue(check_crc(self.data, 0xe2db))
self.assertTrue(check_crc(self.string, 0x889e))
