def eval(self, string):
"""eval(string) -> value
Evaluates a string in the context of values of this module.
Example:
>>> with context.local(arch = 'i386', os = 'linux'):
... print(13 == constants.eval('SYS_execve + PROT_WRITE'))
True
>>> with context.local(arch = 'amd64', os = 'linux'):
... print(61 == constants.eval('SYS_execve + PROT_WRITE'))
True
>>> with context.local(arch = 'amd64', os = 'linux'):
... print(61 == constants.eval('SYS_execve + PROT_WRITE'))
True
"""
if not isinstance(string, str):
return string
simple = getattr(self, string, None)
if simple is not None:
return simple
key = context.os, context.arch
if key not in self._env_store:
self._env_store[key] = {
key: getattr(self, key)
for key in dir(self) if not key.endswith('__')
}
return Constant('(%s)' % string,
safeeval.values(string, self._env_store[key]))
def eval(self, string):
"""eval(string) -> value
Evaluates a string in the context of values of this module.
Example:
>>> with context.local(arch = 'i386', os = 'linux'):
... print 13 == constants.eval('SYS_execve + PROT_WRITE')
True
>>> with context.local(arch = 'amd64', os = 'linux'):
... print 61 == constants.eval('SYS_execve + PROT_WRITE')
True
>>> with context.local(arch = 'amd64', os = 'linux'):
... print 61 == constants.eval('SYS_execve + PROT_WRITE')
True
"""
if not isinstance(string, str):
return string
simple = getattr(self, string, None)
if simple is not None:
return simple
key = context.os, context.arch
if key not in self._env_store:
self._env_store[key] = {key: getattr(self, key) for key in dir(self) if not key.endswith('__')}
return Constant('(%s)' % string, safeeval.values(string, self._env_store[key]))
def __init__(self, n):
if isinstance(n, (str, unicode)):
self.n = 0
x = BitPolynom(2)
try:
for p in n.split('+'):
k = safeeval.values(p.strip(), {'x': x, 'X': x})
assert isinstance(k, (BitPolynom, int, long))
assert k >= 0
self.n ^= int(k)
except (ValueError, NameError, AssertionError):
raise ValueError("Not a valid polynomial: %s" % n)
elif isinstance(n, (int, long)):
if n >= 0:
self.n = n
else:
raise ValueError("Polynomials cannot be negative: %d" % n)
else:
raise TypeError("Polynomial must be called with a string or integer")
def eval(self, string):
"""eval(string) -> value
Evaluates a string in the context of values of this module.
Example:
>>> with context.local(arch = 'i386', os = 'linux'):
... print(13 == constants.eval('SYS_execve + PROT_WRITE'))
True
>>> with context.local(arch = 'amd64', os = 'linux'):
... print(61 == constants.eval('SYS_execve + PROT_WRITE'))
True
>>> with context.local(arch = 'amd64', os = 'linux'):
... print(61 == constants.eval('SYS_execve + PROT_WRITE'))
True
"""
if not isinstance(string, str):
return string
simple = getattr(self, string, None)
if simple is not None:
return simple
key = context.os, context.arch
if key not in self._env_store:
self._env_store[key] = {
key: getattr(self, key)
for key in dir(self) if not key.endswith('__')
}
val = safeeval.values(string, self._env_store[key])
# if the expression is not assembly-safe, it is not so vital to preserve it
if set(string) & (set(bytearray(range(32)).decode())
| set('"#$\',.;@[\\]`{}')):
string = val
return Constant('(%s)' % string, val)