gstreamer/ext/vulkan/shaders/bin2array.py

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#!/usr/bin/env python3
# GStreamer
# Copyright (C) 2020 Matthew Waters <matthew@centricular.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#
import binascii
import sys
import os
import argparse
autogenerated_notice = """/*
* This file is autogenerated by bin2array.py
*/
"""
def make_sublist_group (lst: list, grp: int) -> list:
"""
Group list elements into sublists.
make_sublist_group([1, 2, 3, 4, 5, 6, 7], 3) = [[1, 2, 3], [4, 5, 6], 7]
"""
return [lst[i:i+grp] for i in range(0, len(lst), grp)]
def generate_c_array_data (bindata: bytes,
element_prefix: str,
element_size: int,
element_suffix: str,
newline_value: str,
newline_after: int,
element_separator: str) -> str:
"""
Generate the contents of a C array as a hex string
e.g:
0x10, 0x20, 0x30, 0x40,
0x50, 0x60, 0x70, 0x80,
"""
hexstr = binascii.hexlify(bindata).decode("UTF-8")
array = []
for i in range(0, len(hexstr), 2 * element_size):
array += [element_prefix + hexstr[i:i + 2 * element_size] + element_suffix]
if newline_after:
array = make_sublist_group(array, newline_after)
else:
array = [array,]
return newline_value.join([element_separator.join(e) + element_separator for e in array])
def decorate_c_array_data (hexdata: str,
var_name: str,
var_type: str,
newline_value: str):
"""
Place @hexdata into a valid C array named @var_name of C type @var_type.
"""
ret = var_type + " " + var_name + "[] = {" + newline_value
ret += hexdata + newline_value
ret += "};" + newline_value
return ret
def main(args):
parser = argparse.ArgumentParser(description='Convert binary file to C-style array initializer.')
parser.add_argument("-i", "--input", help="the file to be converted")
parser.add_argument("--output", help="c source file location")
parser.add_argument("--header-output", help="c header file location")
parser.add_argument("--linebreak", type=int, help="add linebreak after every N element")
parser.add_argument("--linebreak-value", default="\n", help="use what sequence to break lines, defaults to \"\\n\"")
parser.add_argument("--separator", default=", ", help="use what to separate elements, defaults to \", \"")
parser.add_argument("--array-name", default="array_data", help="name of the resulting array")
parser.add_argument("--element-type", default="char", help="C type for the array")
parser.add_argument("--element-size", type=int, default=1, help="how many bytes per element")
parser.add_argument("--element-prefix", default="0x", help="string to be added to the head of element, defaults to \"0x\"")
parser.add_argument("--element-suffix", default="", help="string to be added to the tail of element, defaults to none")
parser.add_argument("--c-include", help="header to include")
args = parser.parse_args(args)
with open(args.input, 'rb') as f:
file_content = f.read()
# don't deal with unaligned content
assert len(file_content) % args.element_size == 0
# get a relative path from the source file to the header to use in an #include
source_to_header = os.path.relpath (os.path.dirname (args.header_output),
os.path.dirname (args.output))
ret = autogenerated_notice
ret += "#include \""
ret += os.path.join (source_to_header,
os.path.basename (args.header_output))
ret += "\"" + args.linebreak_value
arr_data = generate_c_array_data (file_content,
args.element_prefix,
args.element_size,
args.element_suffix,
args.linebreak_value,
args.linebreak,
args.separator)
ret += decorate_c_array_data (arr_data,
args.array_name,
args.element_type,
args.linebreak_value)
with open (args.output, 'w') as f:
f.write (ret)
# write companion header
with open(args.header_output, 'w') as f:
f.write (autogenerated_notice)
if args.c_include:
f.write ("#include <" + args.c_include + ">" + args.linebreak_value)
f.write ("extern " + args.element_type + " " + args.array_name + "[];" + args.linebreak_value)
f.write ("#define " + args.array_name + "_size " + str(len(file_content) // args.element_size))
if __name__ == "__main__":
sys.exit(main(sys.argv[1:]))