1# encoding=utf-8
2# Copyright © 2018 Intel Corporation
3#
4# Permission is hereby granted, free of charge, to any person obtaining a
5# copy of this software and associated documentation files (the "Software"),
6# to deal in the Software without restriction, including without limitation
7# the rights to use, copy, modify, merge, publish, distribute, sublicense,
8# and/or sell copies of the Software, and to permit persons to whom the
9# Software is furnished to do so, subject to the following conditions:
10#
11# The above copyright notice and this permission notice (including the next
12# paragraph) shall be included in all copies or substantial portions of the
13# Software.
14#
15# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21# IN THE SOFTWARE.
22
23# Converts a file to a C/C++ #include containing a string
24
25from __future__ import unicode_literals
26import argparse
27import io
28import string
29import sys
30
31
32def get_args():
33    parser = argparse.ArgumentParser()
34    parser.add_argument('input', help="Name of input file")
35    parser.add_argument('output', help="Name of output file")
36    parser.add_argument("-n", "--name",
37                        help="Name of C variable")
38    args = parser.parse_args()
39    return args
40
41
42def filename_to_C_identifier(n):
43    if n[0] != '_' and not n[0].isalpha():
44        n = "_" + n[1:]
45
46    return "".join([c if c.isalnum() or c == "_" else "_" for c in n])
47
48
49def emit_byte(f, b):
50    if ord(b) == ord('\n'):
51        f.write(b"\\n\"\n    \"")
52        return
53    elif ord(b) == ord('\r'):
54        f.write(b"\\r\"\n    \"")
55        return
56    elif ord(b) == ord('\t'):
57        f.write(b"\\t")
58        return
59    elif ord(b) == ord('"'):
60        f.write(b"\\\"")
61        return
62    elif ord(b) == ord('\\'):
63        f.write(b"\\\\")
64        return
65
66    if ord(b) >= ord(' ') and ord(b) <= ord('~'):
67        f.write(b)
68    else:
69        hi = ord(b) >> 4
70        lo = ord(b) & 0x0f
71        f.write("\\x{:x}{:x}".format(hi, lo).encode('utf-8'))
72
73
74def process_file(args):
75    with io.open(args.input, "rb") as infile:
76        try:
77            with io.open(args.output, "wb") as outfile:
78                # If a name was not specified on the command line, pick one based on the
79                # name of the input file.  If no input filename was specified, use
80                # from_stdin.
81                if args.name is not None:
82                    name = args.name
83                else:
84                    name = filename_to_C_identifier(args.input)
85
86                outfile.write("static const char {}[] =\n \"".format(name).encode('utf-8'))
87
88                while True:
89                    byte = infile.read(1)
90                    if byte == b"":
91                        break
92
93                    emit_byte(outfile, byte)
94
95                outfile.write(b"\"\n    ;\n")
96        except Exception:
97            # In the event that anything goes wrong, delete the output file,
98            # then re-raise the exception. Deleteing the output file should
99            # ensure that the build system doesn't try to use the stale,
100            # half-generated file.
101            os.unlink(args.output)
102            raise
103
104
105def main():
106    args = get_args()
107    process_file(args)
108
109
110if __name__ == "__main__":
111    main()
112