121 lines
2.2 KiB
Python
Executable File
121 lines
2.2 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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CFE Partition Tag
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{
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u32 part_id;
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u32 part_size;
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u16 flags;
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char part_name[33];
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char part_version[21];
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u32 part_crc32;
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}
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"""
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import argparse
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import os
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import struct
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import binascii
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PART_NAME_SIZE = 33
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PART_VERSION_SIZE = 21
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def auto_int(x):
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return int(x, 0)
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def str_to_bytes_pad(string, size):
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str_bytes = string.encode()
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num_bytes = len(str_bytes)
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if (num_bytes >= size):
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str_bytes = str_bytes[:size - 1] + '\0'.encode()
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else:
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str_bytes += '\0'.encode() * (size - num_bytes)
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return str_bytes
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def create_tag(args, in_bytes, size):
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# JAM CRC32 is bitwise not and unsigned
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crc = (~binascii.crc32(in_bytes) & 0xFFFFFFFF)
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tag = bytearray()
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tag += struct.pack('>I', args.part_id)
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tag += struct.pack('>I', size)
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tag += struct.pack('>H', args.part_flags)
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tag += str_to_bytes_pad(args.part_name, PART_NAME_SIZE)
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tag += str_to_bytes_pad(args.part_version, PART_VERSION_SIZE)
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tag += struct.pack('>I', crc)
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return tag
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def create_output(args):
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in_st = os.stat(args.input_file)
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in_size = in_st.st_size
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in_f = open(args.input_file, 'r+b')
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in_bytes = in_f.read(in_size)
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in_f.close()
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tag = create_tag(args, in_bytes, in_size)
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out_f = open(args.output_file, 'w+b')
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out_f.write(tag)
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out_f.close()
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def main():
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global args
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parser = argparse.ArgumentParser(description='')
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parser.add_argument('--flags',
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dest='part_flags',
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action='store',
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type=auto_int,
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help='Partition Flags')
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parser.add_argument('--id',
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dest='part_id',
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action='store',
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type=auto_int,
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help='Partition ID')
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parser.add_argument('--input-file',
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dest='input_file',
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action='store',
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type=str,
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help='Input file')
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parser.add_argument('--output-file',
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dest='output_file',
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action='store',
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type=str,
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help='Output file')
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parser.add_argument('--name',
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dest='part_name',
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action='store',
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type=str,
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help='Partition Name')
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parser.add_argument('--version',
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dest='part_version',
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action='store',
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type=str,
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help='Partition Version')
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args = parser.parse_args()
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if ((not args.part_flags) or
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(not args.part_id) or
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(not args.input_file) or
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(not args.output_file) or
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(not args.part_name) or
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(not args.part_version)):
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parser.print_help()
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else:
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create_output(args)
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main()
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