ipv6 packet with option decodes error

[h3cnp]

Describe the bug
An IPv6 packet with option decodes error

System information
A clear and concise description of your system information.

• OS Version: win10
• Python Version: 3.11
• Python Implementation: [e.g. CPython, PyPy]

Traceback stack

pcapkit.PCAPKIT_DEVMODE=True
json = pcapkit.extract(fin='ipv4_over_srv6.pcap', fout='out.json', format='json', extension=False)
[ERROR] 06/24/2024 03:36:43 PM - bad char in struct format
struct.error: bad char in struct format
[WARNING] 06/24/2024 03:36:43 PM - EOF reached

json = pcapkit.extract(fin='sbfd.pcap', fout='out.json', format='json', extension=False)
[WARNING] 06/24/2024 03:37:19 PM - EOF reached

frame.zip

Expected behavior
L4 header (e.g. UDP) or tunnel payload after IPv6 option decodes error. It looks like L4 parsing starts from the ipv6 option.
Find the example packet in the attachment.

Additional context
Add any other context about the problem here.

[JarryShaw]

It appears that the padding length of the capsulated IPv4 packet was incorrectly calculated (as -4). I'll look further into this issue.

[JarryShaw]

This issue should've been fixed in PyPCAPKit 1.3.4.