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import string
import random
import mmap
DATATYPES = dict(
ascii_letters=string.ascii_letters,
ascii_lowercase=string.ascii_lowercase,
ascii_uppercase=string.ascii_uppercase,
digits=string.digits,
hexdigits=string.hexdigits,
octdigits=string.octdigits,
punctuation=string.punctuation,
whitespace=string.whitespace,
ascii=string.printable,
bytes="".join(chr(i) for i in range(256))
)
class TransformGenerator(object):
"""
Perform a byte-by-byte transform another generator - that is, for each
input byte, the transformation must produce one output byte.
gen: A generator to wrap
transform: A function (offset, data) -> transformed
"""
def __init__(self, gen, transform):
self.gen = gen
self.transform = transform
def __len__(self):
return len(self.gen)
def __getitem__(self, x):
d = self.gen.__getitem__(x)
return self.transform(x, d)
def __getslice__(self, a, b):
d = self.gen.__getslice__(a, b)
return self.transform(a, d)
def __repr__(self):
return "'transform(%s)'" % self.gen
class RandomGenerator(object):
def __init__(self, dtype, length):
self.dtype = dtype
self.length = length
def __len__(self):
return self.length
def __getitem__(self, x):
return random.choice(DATATYPES[self.dtype])
def __getslice__(self, a, b):
b = min(b, self.length)
chars = DATATYPES[self.dtype]
return "".join(random.choice(chars) for x in range(a, b))
def __repr__(self):
return "%s random from %s" % (self.length, self.dtype)
class FileGenerator(object):
def __init__(self, path):
self.path = path
self.fp = file(path, "rb")
self.map = mmap.mmap(self.fp.fileno(), 0, access=mmap.ACCESS_READ)
def __len__(self):
return len(self.map)
def __getitem__(self, x):
return self.map.__getitem__(x)
def __getslice__(self, a, b):
return self.map.__getslice__(a, b)
def __repr__(self):
return "<%s" % self.path
|
