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fbstj/signed.py

Created July 2, 2013 09:37
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signed.py
def signed(chars, index = 0, length = 16):
"""convert a `length/4` character hex string into a signed `length`-bit number"""
v = int(chars[index:][:(length / 4)], 16)
return v if v < (1 << (length - 1)) else v - (1 << length)
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