Intelhex check can prevent flashing of binary file. (ESPTOOL-855)

Operating System

Fedora linux 40

Esptool Version

esptool.py v4.7.0 4.7.0

Python Version

Python 3.12.2

Full Esptool Command Line that Was Run

No response

Esptool Output

Traceback (most recent call last):
  File "/opt/esp/python_env/idf5.0_py3.8_env/bin/esptool.py", line 37, in <module>
    esptool._main()
  File "/opt/esp/python_env/idf5.0_py3.8_env/lib/python3.8/site-packages/esptool/__init__.py", line 1139, in _main
    main()
  File "/opt/esp/python_env/idf5.0_py3.8_env/lib/python3.8/site-packages/esptool/__init__.py", line 669, in main
    args = parser.parse_args(argv)
  File "/usr/lib/python3.8/argparse.py", line 1780, in parse_args
    args, argv = self.parse_known_args(args, namespace)
  File "/usr/lib/python3.8/argparse.py", line 1812, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/usr/lib/python3.8/argparse.py", line 2000, in _parse_known_args
    positionals_end_index = consume_positionals(start_index)
  File "/usr/lib/python3.8/argparse.py", line 1977, in consume_positionals
    take_action(action, args)
  File "/usr/lib/python3.8/argparse.py", line 1886, in take_action
    action(self, namespace, argument_values, option_string)
  File "/usr/lib/python3.8/argparse.py", line 1171, in __call__
    subnamespace, arg_strings = parser.parse_known_args(arg_strings, None)
  File "/usr/lib/python3.8/argparse.py", line 1812, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/usr/lib/python3.8/argparse.py", line 2021, in _parse_known_args
    stop_index = consume_positionals(start_index)
  File "/usr/lib/python3.8/argparse.py", line 1977, in consume_positionals
    take_action(action, args)
  File "/usr/lib/python3.8/argparse.py", line 1886, in take_action
    action(self, namespace, argument_values, option_string)
  File "/opt/esp/python_env/idf5.0_py3.8_env/lib/python3.8/site-packages/esptool/__init__.py", line 1113, in __call__
    argfile = intel_hex_to_bin(argfile, address)
  File "/opt/esp/python_env/idf5.0_py3.8_env/lib/python3.8/site-packages/esptool/bin_image.py", line 51, in intel_hex_to_bin
    ih.loadhex(file.name)
  File "/opt/esp/python_env/idf5.0_py3.8_env/lib/python3.8/site-packages/intelhex/__init__.py", line 210, in loadhex
    for s in fobj:
  File "/usr/lib/python3.8/codecs.py", line 322, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe4 in position 1: invalid continuation byte

What is the Expected Behaviour?

I expect that I can flash a bin-file that is encrypted, without have to ensure it do not randomly start with :.

More Information

by shire chance the encrypted bin file for the esp32 started with a :, and the esptool tries to parse it as a intel Hex-file. The file name do have the file-extension: .bin and NOT the .ihex or .rom that a intelhex-file could have.

Other Steps to Reproduce