header tag length is zero

[sususu98]

https://github.com/Riscure/python-trsfile/blob/1ac882d45bcc72825f5ff2113200bc8182b5a39d/trsfile/engine/trs.py#L518

[sususu98]

while Header.TRACE_BLOCK not in self.headers:
			# Obtain the Tag
			tag = self.handle.read(1)[0]

			# Obtain the Length
			tag_length = self.handle.read(1)[0]

			if (tag_length & 0x80) != 0:
				tag_length = int.from_bytes(self.handle.read(tag_length & 0x7F), 'little')
			if tag_length==0 and tag!=0x5f :
				continue

[TomHogervorst]

Aplogies for the late reply. In which situation did you encounter an issue with the tag length being zero? Could you help me reproduce the bug that your suggestion fixes?

[SkyLineBeyonder]

The code here lacks a check for whether tag_value is of NoneType. When tag_length is 0, tag_value will be set to NoneType, leading to errors during subsequent parsing of tag_value.

[SkyLineBeyonder]

SU provided a temporary solution for this bug.
#37 (comment)