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Feature #5114
closedIntroduce proper TLV parser + constructor
Start date:
04/11/2021
Due date:
% Done:
100%
Spec Reference:
Description
With 'construct' we now have the tools to deal with various hand-coded binary formats.
What we're still missing is a proper TLV parser/encoder that does what we need:- support single-byte tag + single-byte value
- support BER-TLV with variable-length length fields
- discovering unknown TLVs is not an error and should just work
- a way to specify human-readable description text for each tag
- a way to specify a brief name/identifier which is to be used in the parse result to describe the field
- ability to call a sub-decoder
- for nested TLVs, or
- to further decode the value part in whatever format it may be
Once we have this in place, we should migrate any existing encoders/decoders over to this new TLV codebase.
We've so far explored- pytlv
- lacks support for BER-TLV
- doesn't support parsing unknown tags
- name/id mapping needs to be glued on top
- uttlv
- lacks support for BER-TLV
- natively supports tag names via its tag_map concept
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