def best_fit(self, start=None):
"""
Find the minimum size required to fit in the data.
"""
if start is None:
start = 1
_check_version(start)
# Corresponds to the code in util.create_data, except we don't yet know
# version, so optimistically assume start and check later
mode_sizes = util.mode_sizes_for_version(start)
buffer = util.BitBuffer()
for data in self.data_list:
buffer.put(data.mode, 4)
buffer.put(len(data), mode_sizes[data.mode])
data.write(buffer)
needed_bits = len(buffer)
self.version = bisect_left(util.BIT_LIMIT_TABLE[self.error_correction],
needed_bits, start)
if self.version == 41:
raise exceptions.DataOverflowError()
# Now check whether we need more bits for the mode sizes, recursing if
# our guess was too low
if mode_sizes is not util.mode_sizes_for_version(self.version):
self.best_fit(start=self.version)
return self.version
def best_fit(self, start=None):
"""
Find the minimum size required to fit in the data.
"""
if start is None:
start = 1
_check_version(start)
# Corresponds to the code in util.create_data, except we don't yet know
# version, so optimistically assume start and check later
mode_sizes = util.mode_sizes_for_version(start)
needed_bits = len(self.buffer)
self.version = bisect_left(util.BIT_LIMIT_TABLE[self.error_correction],
needed_bits, start)
if self.version >= 41:
raise OverflowError('Too many characters')
# Now check whether we need more bits for the mode sizes, recursing if
# our guess was too low
if mode_sizes is not util.mode_sizes_for_version(self.version):
self.buffer = util.BitBuffer()
util.generate_data(self.buffer, self.data_list, self.version)
self.best_fit(start=self.version)
return self.version
def make(self, fit=True):
"""
Compile the data into a QR Code array.
:param fit: If ``True`` (or if a size has not been provided), find the
best fit for the data to avoid data overflow errors.
"""
self.buffer = util.BitBuffer()
util.generate_data(self.buffer, self.data_list, self.version)
if fit or (self.version is None):
self.best_fit(start=self.version)
self.makeImpl(False, self.best_mask_pattern())
