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#!/usr/bin/env python3
#
# Copyright (c) 2024 Raspberry Pi (Trading) Ltd.
#
# SPDX-License-Identifier: BSD-3-Clause
"""Generate a header that provides a binary file as an array."""
import argparse
from pathlib import Path
import sys
_BYTES_PER_LINE = 32
def _parse_args():
parser = argparse.ArgumentParser(
description=__doc__,
)
parser.add_argument(
"data",
type=argparse.FileType("rb"),
help="Path to data file to generate a header for",
)
parser.add_argument(
"-o",
"--output",
type=argparse.FileType("wb"),
default=sys.stdout.buffer,
help="Output file path. Defaults to stdout.",
)
return parser.parse_args()
def generate_header(data, output):
var_name = Path(output.name).stem.replace(".", "_")
include_guard = f"_{var_name.upper()}_H"
prefix_lines = (
f"#ifndef {include_guard}",
f"#define {include_guard}",
"",
"#include <stddef.h>",
"",
f"const unsigned char {var_name}[] = {{",
)
output.write("\n".join(prefix_lines).encode())
bytes_written = 0
while True:
b = data.read(1)
if b == b"":
break
if bytes_written % _BYTES_PER_LINE == 0:
output.write("\n ".encode())
output.write(f"0x{int.from_bytes(b, 'little'):02x}, ".encode())
bytes_written += 1
suffix_lines = (
"",
"};",
"",
f"const size_t {var_name}_SIZE = {bytes_written};",
"",
f"#endif // {include_guard}",
"",
)
output.write("\n".join(suffix_lines).encode())
if __name__ == "__main__":
sys.exit(generate_header(**vars(_parse_args())))
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