def to_signed(number,
bit_width=None):
r"""
Convert number to a signed number and return the result.
Examples:
With the following code:
var1 = 0xfffffffffffffff1
print_var(var1)
print_var(var1, 1)
var1 = to_signed(var1)
print_var(var1)
print_var(var1, 1)
The following is written to stdout:
var1: 18446744073709551601
var1: 0x00000000fffffffffffffff1
var1: -15
var1: 0xfffffffffffffff1
The same code but with var1 set to 0x000000000000007f produces the
following:
var1: 127
var1: 0x000000000000007f
var1: 127
var1: 0x000000000000007f
Description of argument(s):
number The number to be converted.
bit_width The number of bits that defines a complete
hex value. Typically, this would be a
multiple of 32.
"""
if bit_width is None:
try:
bit_width = gp.bit_length(long(sys.maxsize)) + 1
except NameError:
bit_width = gp.bit_length(int(sys.maxsize)) + 1
if number < 0:
return number
neg_bit_mask = 2**(bit_width - 1)
if number & neg_bit_mask:
return ((2**bit_width) - number) * -1
else:
return number
def to_signed(number,
bit_width=gp.bit_length(long(sys.maxsize)) + 1):
r"""
Convert number to a signed number and return the result.
Examples:
With the following code:
var1 = 0xfffffffffffffff1
print_var(var1)
print_var(var1, 1)
var1 = to_signed(var1)
print_var(var1)
print_var(var1, 1)
The following is written to stdout:
var1: 18446744073709551601
var1: 0x00000000fffffffffffffff1
var1: -15
var1: 0xfffffffffffffff1
The same code but with var1 set to 0x000000000000007f produces the
following:
var1: 127
var1: 0x000000000000007f
var1: 127
var1: 0x000000000000007f
Description of argument(s):
number The number to be converted.
bit_width The number of bits that defines a complete
hex value. Typically, this would be a
multiple of 32.
"""
if number < 0:
return number
neg_bit_mask = 2**(bit_width - 1)
if number & neg_bit_mask:
return ((2**bit_width) - number) * -1
else:
return number
