TLV: Add one-shot TLV encoder
So far, the TLV code contained two types of functions
* tlp_parse() to parse all TLVs according to definition into tlvp_parsed
* various helper functions to encode individual TLVs during message
generation
This patch implements the inverse of tlv_parse(): tlv_encode(), which
takes a full 'struct tlv_pared' and encodes all IEs found in it. The
order of IEs is in numerically ascending order of the tag.
As many protocols have different IE/TLV ordering requirements, let's add
a tlv_encode_ordered() function where the caller can specify the TLV
ordering during the one-shot encode.
Change-Id: I761a30bf20355a9f80a4a8e0c60b0b0f78515efe
diff --git a/include/osmocom/gsm/tlv.h b/include/osmocom/gsm/tlv.h
index d0c9552..bb0e8fc 100644
--- a/include/osmocom/gsm/tlv.h
+++ b/include/osmocom/gsm/tlv.h
@@ -457,6 +457,12 @@
/* take a master (src) tlv def and fill up all empty slots in 'dst' */
void tlv_def_patch(struct tlv_definition *dst, const struct tlv_definition *src);
+int tlv_encode_one(struct msgb *msg, enum tlv_type type, uint8_t tag,
+ unsigned int len, const uint8_t *val);
+int tlv_encode(struct msgb *msg, const struct tlv_definition *def, const struct tlv_parsed *tp);
+int tlv_encode_ordered(struct msgb *msg, const struct tlv_definition *def, const struct tlv_parsed *tp,
+ const uint8_t *tag_order, unsigned int tag_order_len);
+
#define TLVP_PRESENT(x, y) ((x)->lv[y].val)
#define TLVP_LEN(x, y) (x)->lv[y].len
#define TLVP_VAL(x, y) (x)->lv[y].val