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author | Neels Hofmeyr <nhofmeyr@sysmocom.de> | 2022-01-12 02:38:39 +0100 |
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committer | Neels Hofmeyr <neels@hofmeyr.de> | 2022-06-16 13:04:33 +0200 |
commit | 2100097ef1be98a338b583f15bb5f529690829ff (patch) | |
tree | ad4d0d13806e476472581b2bde554c6595cd9848 /contrib | |
parent | cf11908f9c39ee98b063d1ca33770179f34a3652 (diff) |
libosmo-gtlv: add generic TLV de- and encoder
An all new TLV parser supporting:
- Any size of T and L (determined by callback function),
- "Grouped IEs", so that an IE payload is a nested IE structure,
- optional/mandatory/multi-occurence IEs,
- decoding unordered tags (or enforcing strict order).
Will be used for PFCP message decoding and encoding, a T16L16V protocol
which requires above features.
Upcoming patches add
- translating PDUs to plain C structs and vice versa
- TLV generator to reduce repetition a in protocol definition
- TLIV capability
Previously, the way we deal with TLVs causes a lot of code
re-implementation: the TL decoding is taken care of by the API, but for
encoding, we essentially re-implement each protocol and each encoded
message in the individual programs. This API is an improvement in that
we only once implement the TL coding (or just use osmo_t8l8v_cfg /
osmo_t16l16v_cfg), get symmetric de- and encoding of the TL, and only
need to deal with the value part of each IE.
The common pattern of
- store TL preliminarily,
- write V data and
- update L after V is complete
is conveniently done by osmo_gtlv_put_update_tl().
Related: SYS#5599
Change-Id: Ib0fd00d9f288ffe13b7e67701f3e47073587404a
Diffstat (limited to 'contrib')
0 files changed, 0 insertions, 0 deletions