def bsr(value, bits):

""" bsr(value, bits) -> value shifted right by bits

This function is here because an expression in the original java

source contained the token '>>>' and/or '>>>=' (bit shift right

and/or bit shift right assign). In place of these, the python

source code below contains calls to this function.

Copyright 2003 Jeffrey Clement. See pyrijnadel.py for license and

original source.

"""

minint = -2147483648

if bits == 0:

return value

elif bits == 31:

if value & minint:

return 1

else:

return 0

elif bits < 0 or bits > 31:

raise ValueError('bad shift count')

tmp = (value & 0x7FFFFFFE) // 2**bits

if (value & minint):

return (tmp | (0x40000000 // 2**(bits-1)))

else:

return tmp