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# Copyright 2010 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import struct
import Crypto.Cipher.ARC4
class DataGenerator(object):
'''Generate random binary data.'''
_data = 'x' * 1024**2
def __init__(self, seed):
key = struct.pack('!Q', seed)
self._arc4 = Crypto.Cipher.ARC4.new(key)
self._buffer = []
self._buffer_length = 0
def generate(self, size):
while self._buffer_length < size:
self._generate_junk()
return self._split_off_data(size)
def _generate_junk(self):
junk = self._arc4.encrypt(self._data)
self._buffer.append(junk)
self._buffer_length += len(junk)
def _split_off_data(self, size):
self._buffer = [''.join(self._buffer)]
data = self._buffer[0][:size]
self._buffer[0] = self._buffer[0][size:]
self._buffer_length -= len(data)
return data
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