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neels uploaded patch set #7 to this change.

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libosmo-tlv: add auto dec/enc to/from structs

Add osmo_tlv_coding: describe the value part of a TLV (decode and
encode), describe a struct with its members, and get/put readily decoded
structs from/to a raw PDU, directly.

With osmo_tlv_coding defined for a protocol's tags, we only deal with
encoded PDUs or fully decoded C structs, no TLV related
re-implementations clutter up the message handling code.

A usage example is given in tlv_dec_enc_test. The first real use will be
the PFCP protocol in osmo-upf.git.

With osmo_tlv_coding, there still is a lot of monkey work involved in
describing the decoded structs. A subsequent patch adds a generator for
osmo_tlv_coding and message structs from tag value lists.

Related: SYS#5599
Change-Id: I65de793105882a452124ee58adb0e58469e6e796
---
M include/osmocom/tlv/Makefile.am
A include/osmocom/tlv/tlv_dec_enc.h
M src/libosmo-tlv/Makefile.am
A src/libosmo-tlv/tlv_dec_enc.c
M tests/libosmo-tlv/Makefile.am
A tests/libosmo-tlv/tlv_dec_enc_test.c
A tests/libosmo-tlv/tlv_dec_enc_test.ok
M tests/testsuite.at
8 files changed, 1,288 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-upf refs/changes/18/27218/7

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