font-Hack/postbuild_processing/fixes/fix-dsig.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2013,2016 The Font Bakery Authors
#
# 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.
#
# Adapted for the Hack typeface build workflow by Chris Simpkins
import sys
import os
from fontTools import ttLib


def set_empty_dsig(ttFont):
    newDSIG = ttLib.newTable("DSIG")
    newDSIG.ulVersion = 1
    newDSIG.usFlag = 0
    newDSIG.usNumSigs = 0
    newDSIG.signatureRecords = []
    ttFont.tables["DSIG"] = newDSIG


def main(argv):
    for path in argv:
        if not os.path.exists(path):
            sys.stderr.write(
                "[fix-dsig.py] ERROR: " +
                path +
                " is not a valid path to a font file"
            )
            sys.exit(1)
        else:
            font = ttLib.TTFont(file=path, recalcTimestamp=False)
            set_empty_dsig(font)
            font.save(path)
            print(path + " - successful DSIG table fix")


if __name__ == '__main__':
    main(sys.argv[1:])