/usr/share/pyshared/libtiff/test_bittools.py is in python-libtiff 0.3.0~svn78-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | import numpy
import bittools
def tobinary(arr):
return ''.join([str(bittools.getbit (arr,i)) for i in range (arr.nbytes*8)])
def test_setgetbit():
# bit-wise copy
arr = numpy.array(range(256), dtype=numpy.float64)
arr2 = numpy.zeros(arr.shape, dtype=arr.dtype)
for i in range(arr.nbytes * 8):
b = bittools.getbit(arr, i)
bittools.setbit(arr2, i, b)
assert (arr==arr2).all(),`arr,arr2`
print 'ok'
def test_setgetword():
for dtype in [numpy.ubyte, numpy.int32, numpy.float64]:
arr = numpy.array(range(-256,256), dtype=dtype)
arr2 = numpy.zeros(arr.shape, dtype=arr.dtype)
for i in range (arr.nbytes):
word, next = bittools.getword (arr,i*8,8)
bittools.setword (arr2,i*8,8,word)
assert (arr==arr2).all(),`arr,arr2`
print 'ok'
def test_wordbits ():
for width in range (1,64+1):
arr = numpy.array([131,17,235], dtype=numpy.int64)
arr2 = numpy.zeros((1+width//8), dtype=arr.dtype)
bstr = tobinary(arr)
word, next = bittools.getword(arr, 0, width)
if width > 7:
assert word==arr[0],`word, arr[0], bstr`
bittools.setword (arr2, 0, width, word)
assert bittools.getword (arr2, 0, width)[0]==word
assert tobinary(arr2)[:width] == bstr[:width],`tobinary(arr2)[:width], bstr[:width]`
if __name__=='__main__':
test_setgetbit()
test_setgetword()
test_wordbits ()
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