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'''Common functionality shared by several modules.'''
import math
def bit_size(number):
'''Returns the number of bits required to hold a specific long number.
>>> bit_size(1023)
10
>>> bit_size(1024)
10
>>> bit_size(1025)
11
'''
if number < 0:
raise ValueError('Only nonnegative numbers possible: %s' % number)
if number == 0:
return 1
return int(math.ceil(math.log(number, 2)))
def byte_size(number):
"""Returns the number of bytes required to hold a specific long number.
The number of bytes is rounded up.
"""
return int(math.ceil(bit_size(number) / 8.0))
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