Intel HEX format display

intel-hex.py

import argparse


def parse_line(line: str) -> dict:
  start_index = line.index(':')
  record_line = line[start_index:]
  record = {
    'byte_count': int(record_line[1:3], 16),
    'address': record_line[3:7],
    'type': record_line[7:9],
    'data': record_line[9:-2],
    'checksum': record_line[-2:]
  }
  assert len(record['data']) == record['byte_count'] * 2
  return record


def print_record(env, record):
  if 'start_address' in env:
    print(env['start_address'], end='')
  print(record['address'] + ': ', end='')
  data = record['data']
  print(' '.join("%s%s%s%s" % x for x in zip(
    data[::4], data[1::4], data[2::4], data[3::4]
  )), end='')

  print('  ', end='')
  for x in zip(data[::2], data[1::2]):
    c = chr(int("%s%s" % x, 16))
    if c.isprintable():
      print(c, end='')
    else:
      print('.', end='')
  print('')


def main(args):
  env = {}
  with open(args.file, 'r') as f:
    for line in f:
      record = parse_line(line.strip())
      if record['type'] == '00':  # Data
        print_record(env, record)
      elif record['type'] == '01':  # End Of File
        break
      elif record['type'] == '02':  # Extended Segment Address
        pass
      elif record['type'] == '03':  # Start Segment Address
        pass
      elif record['type'] == '04':  # Extended Linear Address
        assert record['byte_count'] == 2
        env['start_address'] = record['data']
      elif record['type'] == '05':  # Start Linear Address
        pass


if __name__ == "__main__":
  parser = argparse.ArgumentParser()
  parser.add_argument('file')
  main(parser.parse_args())