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#!/usr/bin/env python
# Copyright 2019 The Chromium Authors
# 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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