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Merge pull request #26 from AdrienCos/master

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Implemented Ackemann generators CLI interface
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Cédric 2019-06-04 21:21:31 +00:00 • committed by GitHub
commit bf094c0361
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3 changed files with 106 additions and 53 deletions
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34
bin/stegano-lsb-set
View file

@ -22,7 +22,7 @@
__author__ = "Cedric Bonhomme"
__version__ = "$Revision: 0.7 $"
__date__ = "$Date: 2016/03/18 $"
__revision__ = "$Date: 2017/05/16 $"
__revision__ = "$Date: 2019/06/04 $"
__license__ = "GPLv3"
import inspect
@ -40,6 +40,19 @@ import argparse
parser = argparse.ArgumentParser(prog='stegano-lsb-set')
subparsers = parser.add_subparsers(help='sub-command help', dest='command')
class ValidateGenerator(argparse.Action):
def __call__(self, parser, args, values, option_string=None):
valid_generators = [generator[0] for generator in inspect.getmembers(
generators, inspect.isfunction)]
# Verify that the generator is valid
generator = values[0]
if generator not in valid_generators:
raise ValueError("Unknown generator: %s" % generator)
# Set the generator_function arg of the parser
setattr(args, self.dest, values)
# Subparser: Hide
parser_hide = subparsers.add_parser('hide', help='hide help')
# Original image
@ -52,9 +65,8 @@ parser_hide.add_argument("-e", "--encoding", dest="encoding",
# Generator
parser_hide.add_argument("-g", "--generator", dest="generator_function",
choices=[generator[0] for generator in \
inspect.getmembers(generators, inspect.isfunction)],
required=True, help="Generator")
action=ValidateGenerator,
nargs='*', required=True, help="Generator (with optional arguments)")
parser_hide.add_argument("-s", "--shift", dest="shift",
default=0, help="Shift for the generator")
@ -80,9 +92,8 @@ parser_reveal.add_argument("-e", "--encoding", dest="encoding",
help="Specify the encoding of the message to reveal." +
" UTF-8 (default) or UTF-32LE.")
parser_reveal.add_argument("-g", "--generator", dest="generator_function",
choices=[generator[0] for generator in \
inspect.getmembers(generators, inspect.isfunction)],
required=True, help="Generator")
action=ValidateGenerator,
nargs='*', required=True, help="Generator (with optional arguments)")
parser_reveal.add_argument("-s", "--shift", dest="shift",
default=0, help="Shift for the generator")
parser_reveal.add_argument("-o", dest="secret_binary",
@ -97,14 +108,19 @@ arguments = parser.parse_args()
if arguments.command != 'list-generators':
try:
arguments.generator_function
arguments.generator_function[0]
except AttributeError:
print('You must specify the name of a generator.')
parser.print_help()
exit(1)
try:
generator = getattr(generators, arguments.generator_function)()
if (len(arguments.generator_function) > 1):
generator = getattr(generators, arguments.generator_function[0])(
*[int(e) for e in arguments.generator_function[1:]])
else:
generator = getattr(generators, arguments.generator_function[0])()
except AttributeError as e:
print("Unknown generator: {}".format(arguments.generator_function))
exit(1)

19
stegano/lsbset/generators.py
View file

@ -22,7 +22,7 @@
__author__ = "Cedric Bonhomme"
__version__ = "$Revision: 0.3 $"
__date__ = "$Date: 2011/12/28 $"
__revision__ = "$Date: 2017/03/10 $"
__revision__ = "$Date: 2019/06/04 $"
__license__ = "GPLv3"
import itertools
@ -107,15 +107,24 @@ def carmichael() -> Iterator[int]:
yield m
def ackermann_naive(m: int, n: int) -> int:
def ackermann_slow(m: int, n: int) -> int:
"""Ackermann number.
"""
if m == 0:
return n + 1
elif n == 0:
return ackermann_naive(m - 1, 1)
return ackermann_slow(m - 1, 1)
else:
return ackermann_naive(m - 1, ackermann_naive(m, n - 1))
return ackermann_slow(m - 1, ackermann_slow(m, n - 1))
def ackermann_naive(m: int) -> Iterator[int]:
"""Naive Ackermann encapsulated in a generator
"""
n = 0
while True:
yield ackermann_slow(m, n)
n += 1
def ackermann_fast(m: int, n: int) -> int:
@ -136,6 +145,7 @@ def ackermann_fast(m: int, n: int) -> int:
else:
return n + 1
def ackermann(m: int) -> Iterator[int]:
"""Ackermann encapsulated in a generator.
"""
@ -144,6 +154,7 @@ def ackermann(m: int) -> Iterator[int]:
yield ackermann_fast(m, n)
n += 1
def fibonacci() -> Iterator[int]:
"""Generate the sequence of Fibonacci.
https://oeis.org/A000045

50
tests/test_generators.py
View file

@ -30,6 +30,7 @@ import itertools
from stegano.lsbset import generators
class TestGenerators(unittest.TestCase):
def test_identity(self):
@ -87,21 +88,46 @@ class TestGenerators(unittest.TestCase):
self.assertEqual(tuple(itertools.islice(generators.carmichael(), 33)),
tuple(int(line) for line in f))
def test_ackermann_naive(self):
"""Test the Ackermann set.
"""
self.assertEqual(generators.ackermann_naive(3, 1), 13)
self.assertEqual(generators.ackermann_naive(3, 2), 29)
def test_ackermann(self):
def test_ackermann_slow(self):
"""Test the Ackermann set.
"""
with open('./tests/expected-results/ackermann', 'r') as f:
self.assertEqual(generators.ackermann_fast(3, 1), int(f.readline()))
self.assertEqual(generators.ackermann_fast(3, 2), int(f.readline()))
self.assertEqual(generators.ackermann_fast(4, 1), int(f.readline()))
self.assertEqual(generators.ackermann_fast(4, 2), int(f.readline()))
self.assertEqual(generators.ackermann_slow(
3, 1), int(f.readline()))
self.assertEqual(generators.ackermann_slow(
3, 2), int(f.readline()))
def test_ackermann_naive(self):
"""Test the Naive Ackermann generator
"""
gen = generators.ackermann_naive(3)
next(gen)
with open('./tests/expected-results/ackermann', 'r') as f:
self.assertEqual(next(gen), int(f.readline()))
self.assertEqual(next(gen), int(f.readline()))
def test_ackermann_fast(self):
"""Test the Ackermann set.
"""
with open('./tests/expected-results/ackermann', 'r') as f:
self.assertEqual(generators.ackermann_fast(
3, 1), int(f.readline()))
self.assertEqual(generators.ackermann_fast(
3, 2), int(f.readline()))
self.assertEqual(generators.ackermann_fast(
4, 1), int(f.readline()))
self.assertEqual(generators.ackermann_fast(
4, 2), int(f.readline()))
def test_ackermann(self):
"""Test the Ackermann generator
"""
gen = generators.ackermann(3)
next(gen)
with open('./tests/expected-results/ackermann', 'r') as f:
self.assertEqual(next(gen), int(f.readline()))
self.assertEqual(next(gen), int(f.readline()))
if __name__ == '__main__':
unittest.main()