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add additional function for 0 #12

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add additional function for 0 #12

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06b049d
add additional function for 0
evan0greenup May 14, 2022
15fd664
rename v -> preset
evan0greenup May 14, 2022
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11 changes: 9 additions & 2 deletions src/bitmap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,12 +25,13 @@ class BitMap(object):
BITMASK = [0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80]
BIT_CNT = [bin(i).count("1") for i in xrange(256)]

def __init__(self, maxnum=0):
def __init__(self, maxnum=0, preset=False):
"""
Create a BitMap
"""
nbytes = (maxnum + 7) // 8
self.bitmap = array.array('B', [0 for i in range(nbytes)])
bit_value = 0xFF if preset else 0x00
self.bitmap = array.array('B', [bit_value for i in range(nbytes)])

def __del__(self):
"""
Expand Down Expand Up @@ -97,6 +98,12 @@ def nonzero(self):
Get all non-zero bits
"""
return [i for i in xrange(self.size()) if self.test(i)]

def zero(self):
"""
Get all zero bits
"""
return [i for i in xrange(self.size()) if not self.test(i)]

def tostring(self):
"""
Expand Down