mirror of
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98 lines
2.5 KiB
Python
98 lines
2.5 KiB
Python
import string
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import random
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import mmap
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import sys
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DATATYPES = dict(
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ascii_letters=string.ascii_letters.encode(),
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ascii_lowercase=string.ascii_lowercase.encode(),
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ascii_uppercase=string.ascii_uppercase.encode(),
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digits=string.digits.encode(),
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hexdigits=string.hexdigits.encode(),
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octdigits=string.octdigits.encode(),
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punctuation=string.punctuation.encode(),
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whitespace=string.whitespace.encode(),
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ascii=string.printable.encode(),
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bytes=bytes(range(256))
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)
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class TransformGenerator:
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"""
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Perform a byte-by-byte transform another generator - that is, for each
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input byte, the transformation must produce one output byte.
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gen: A generator to wrap
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transform: A function (offset, data) -> transformed
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"""
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def __init__(self, gen, transform):
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self.gen = gen
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self.transform = transform
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def __len__(self):
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return len(self.gen)
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def __getitem__(self, x):
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d = self.gen.__getitem__(x)
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if isinstance(x, slice):
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return self.transform(x.start, d)
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return self.transform(x, d)
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def __repr__(self):
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return "'transform(%s)'" % self.gen
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def rand_byte(chars):
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"""
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Return a random character as byte from a charset.
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"""
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# bytearray has consistent behaviour on both Python 2 and 3
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# while bytes does not
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return bytes([random.choice(chars)])
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class RandomGenerator:
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def __init__(self, dtype, length):
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self.dtype = dtype
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self.length = length
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def __len__(self):
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return self.length
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def __getitem__(self, x):
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chars = DATATYPES[self.dtype]
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if isinstance(x, slice):
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return b"".join(rand_byte(chars) for _ in range(*x.indices(min(self.length, sys.maxsize))))
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return rand_byte(chars)
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def __repr__(self):
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return "%s random from %s" % (self.length, self.dtype)
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class FileGenerator:
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def __init__(self, path):
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self.path = path
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self.fp = open(path, "rb")
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self.map = mmap.mmap(self.fp.fileno(), 0, access=mmap.ACCESS_READ)
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def __len__(self):
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return len(self.map)
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def __getitem__(self, x):
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if isinstance(x, slice):
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return self.map.__getitem__(x)
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# A slice of length 1 returns a byte object (not an integer)
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return self.map.__getitem__(slice(x, x + 1 or self.map.size()))
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def __repr__(self):
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return "<%s" % self.path
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def close(self):
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self.map.close()
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self.fp.close()
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