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- #!/usr/bin/env python
- # Copyright 2019 The Chromium Authors. All rights reserved.
- # Use of this source code is governed by a BSD-style license that can be
- # found in the LICENSE file.
- from __future__ import division
- from __future__ import print_function
- from array import array
- import os
- import random
- import shutil
- import sys
- MAX_INPUT_SIZE = 5000 # < 1 MB so we don't blow up fuzzer build sizes.
- MAX_FLOAT32 = 3.4028235e+38
- def IsValidSize(n):
- if n == 0:
- return False
- # PFFFT only supports transforms for inputs of length N of the form
- # N = (2^a)*(3^b)*(5^c) where a >= 5, b >=0, c >= 0.
- FACTORS = [2, 3, 5]
- factorization = [0, 0, 0]
- for i, factor in enumerate(FACTORS):
- while n % factor == 0:
- n = n // factor
- factorization[i] += 1
- return factorization[0] >= 5 and n == 1
- def WriteFloat32ArrayToFile(file_path, size, generator):
- """Generate an array of float32 values and writes to file."""
- with open(file_path, 'wb') as f:
- float_array = array('f', [generator() for _ in range(size)])
- float_array.tofile(f)
- def main():
- if len(sys.argv) < 2:
- print('Usage: %s <path to output directory>' % sys.argv[0])
- sys.exit(1)
- output_path = sys.argv[1]
- # Start with a clean output directory.
- if os.path.exists(output_path):
- shutil.rmtree(output_path)
- os.makedirs(output_path)
- # List of valid input sizes.
- N = [n for n in range(MAX_INPUT_SIZE) if IsValidSize(n)]
- # Set the seed to always generate the same random data.
- random.seed(0)
- # Generate different types of input arrays for each target length.
- for n in N:
- # Zeros.
- WriteFloat32ArrayToFile(
- os.path.join(output_path, 'zeros_%d' % n), n, lambda: 0)
- # Max float 32.
- WriteFloat32ArrayToFile(
- os.path.join(output_path, 'max_%d' % n), n, lambda: MAX_FLOAT32)
- # Random values in the s16 range.
- rnd_s16 = lambda: 32768.0 * 2.0 * (random.random() - 0.5)
- WriteFloat32ArrayToFile(
- os.path.join(output_path, 'rnd_s16_%d' % n), n, rnd_s16)
- sys.exit(0)
- if __name__ == '__main__':
- main()
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