#!/usr/bin/env python
#
# generates an empty binary file
#
# This tool generates an empty binary file of the required size.
#
# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http:#www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function, division
from __future__ import unicode_literals
import argparse
import sys

__version__ = '1.0'

quiet = False


def generate_blanked_file(size, output_path):
    output = b"\xFF" * size
    try:
        stdout_binary = sys.stdout.buffer  # Python 3
    except AttributeError:
        stdout_binary = sys.stdout
    with stdout_binary if output_path == '-' else open(output_path, 'wb') as f:
        f.write(output)


def main():
    parser = argparse.ArgumentParser(description='Generates an empty binary file of the required size.')
    parser.add_argument('size', help='Size of generated the file', type=str)

    parser.add_argument('output', help='Path for binary file.', nargs='?', default='-')
    args = parser.parse_args()

    size = int(args.size, 0)
    if size > 0:
        generate_blanked_file(size, args.output)
    return 0


class InputError(RuntimeError):
    def __init__(self, e):
        super(InputError, self).__init__(e)


if __name__ == '__main__':
    try:
        r = main()
        sys.exit(r)
    except InputError as e:
        print(e, file=sys.stderr)
        sys.exit(2)