#!/usr/bin/env python3
#
# Copyright (c) 2025 Paul Mattes.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the names of Paul Mattes nor the names of his contributors
#       may be used to endorse or promote products derived from this software
#       without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY PAUL MATTES "AS IS" AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL PAUL MATTES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Create an icon file.

import os
import sys

per_line = 16
o_binary = os.O_BINARY if sys.platform.startswith('win') else 0

def mkicon(outfile_name: str, file_name: str):
    # Open the input file.
    f = os.open(file_name, os.O_RDONLY | o_binary, 0o777)

    # Open the output file.
    if outfile_name != None:
        outfile = open(outfile_name, 'w')
    else:
        outfile = sys.stdout

    # Run.
    i = 0
    print('unsigned char favicon[] = {', file=outfile)
    while True:
        c = os.read(f, 1)
        if c == b'':
            break
        if i != 0 and (i % per_line) == 0:
            print(file=outfile)
        print(f'{c[0]:3d},', file=outfile, end='')
        i += 1
    if (i % per_line) != 1:
        print()
    os.close(f)
    print('};\nunsigned favicon_size = sizeof(favicon);', file=outfile)

    if outfile_name != None:
        outfile.close()

def usage():
    '''Print a usage message and exit'''
    print('Usage: mkicon [-o out_file] icon-file', file=sys.stderr)
    exit(1)

# Parse the command line.
outfile_name = None
args = sys.argv.copy()[1:]
while len(args) > 0 and args[0].startswith('-'):
    if args[0] == '-o':
        if len(args) < 2:
            usage()
        outfile_name = args[1]
        args = args[1:]
    else:
        usage()
    args = args[1:]

if len(args) != 1:
    usage()

# Run.
mkicon(outfile_name, sys.argv[0])