Reolink RLN36

[AT0myks]

The firmwares for this device have, for some reason, a slightly different structure.

Right now pakler -l NT98333_NVR_36IP_REOLINK_L300_211_22102136.pak will give

Attempting to guess number of sections... failed to guess, using default of 10
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\user\AppData\Local\Programs\Python\Python311\Scripts\pakler.exe\__main__.py", line 7, in <module>
  File "C:\Users\user\AppData\Local\Programs\Python\Python311\Lib\site-packages\pakler.py", line 484, in main
    header = read_header(filename, section_count)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\user\AppData\Local\Programs\Python\Python311\Lib\site-packages\pakler.py", line 212, in read_header
    return Header(buf, section_count, mtd_part_count)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\user\AppData\Local\Programs\Python\Python311\Lib\site-packages\pakler.py", line 151, in __init__
    self.sections.append(Section(buf[:SECTION_SIZE], num))
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\user\AppData\Local\Programs\Python\Python311\Lib\site-packages\pakler.py", line 87, in __init__
    decode_strings(self, SECTION_STRINGS)
  File "C:\Users\user\AppData\Local\Programs\Python\Python311\Lib\site-packages\pakler.py", line 64, in decode_strings
    fixed = cstr.rstrip(b'\0').decode('utf-8')
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa0 in position 4: invalid start byte

After looking at the file in a hex editor, if you replace the Is by Qs in SECTION_FORMAT and HEADER_FORMAT you get the expected result.

However there is still something else that I'm missing because the CRC is not correct:

CRC MISMATCH, file: NT98333_NVR_36IP_REOLINK_L300_211_22102136.pak, header.crc=3157ab80, got=e3cd54ab

At least this "fix" allowed me to work with the file.

This seems really annoying as I don't know how to spot this different layout and don't see an obvious way of handling it in pakler.

[vmallet]

Interesting, I see things have evolved quite a bit! I just briefly looked and it seems the RLN36 is an ARM64 cpu running a 64-bit Linux. I'll try to take a look to see what happened to the PAK format but time has been hard to find lately.

[AT0myks]

That seems to be exactly it. It looks like this is their only device with 64-bit hardware. I have a PR ready to add support for this layout but there's another one I want to submit first.