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block.py
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block.py
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from bitarray import bitarray
class Source(list):
def __init__(self, k, symbolsize, block_id):
"""
Block constructor
Arguments:
k -- number of symbols
symbolsize -- Size of each symbol in bytes
block_id -- id of this block
"""
self.k = k
self.symbolsize = symbolsize
self.id = block_id
self.padding = 0 # Bytes
def pad(self):
"""
Pads a block to have k bitarrays of symbolsize * 8 bits length
Arguments:
k -- number of bit arrays
symbolsize -- Size of each array in bytes
"""
bitlength = self.symbolsize * 8
for row in self:
if len(row) < bitlength:
self.padding += (bitlength - len(row)) / 8
extension = bitarray(bitlength - len(row))
extension.setall(False)
row.extend(extension)
# Last provided row should be the only row that needs row padding
break
if len(self) < self.k:
for i in xrange(len(self), self.k):
padrow = bitarray(bitlength)
padrow.setall(False)
self.append(padrow)
self.padding += bitlength / 8