diff options
| author | Max <msuraev@sysmocom.de> | 2018-12-10 11:01:10 +0100 |
|---|---|---|
| committer | Max <msuraev@sysmocom.de> | 2018-12-14 13:15:39 +0000 |
| commit | 969fb2ed841d34577d985af4baf67d20c6f35c8a (patch) | |
| tree | 7ac798f0d33aab54688c77fa94f5ab94cf03af98 /src/gsm/gsm0808_utils.c | |
| parent | 7918f84aeb65c4b833ccf86b9daa6ab76f06c031 (diff) | |
LCLS, TS 48.008: add GCR IE encoding/decoding
* add functions to encode Global Call. Ref. from TS 29.205 as 3GPP TS
48.008 §3.2.2.115 information element
* add corresponding tests
Change-Id: I82ce0207dc8de50689a8806c6471ad7fbae6219d
Diffstat (limited to 'src/gsm/gsm0808_utils.c')
| -rw-r--r-- | src/gsm/gsm0808_utils.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/gsm/gsm0808_utils.c b/src/gsm/gsm0808_utils.c index 38a8664c..a04addee 100644 --- a/src/gsm/gsm0808_utils.c +++ b/src/gsm/gsm0808_utils.c @@ -508,6 +508,41 @@ int gsm0808_dec_channel_type(struct gsm0808_channel_type *ct, return (int)(elem - old_elem); } +/*! Create BSSMAP Global Call Reference, 3GPP TS 48.008 §3.2.2.115. + * \param[out] msg Message Buffer for appending IE + * \param[in] g Global Call Reference, 3GPP TS 29.205 Table B 2.1.9.1 + * \returns number of bytes added to \a msg or 0 on error */ +uint8_t gsm0808_enc_gcr(struct msgb *msg, const struct osmo_gcr_parsed *g) +{ + uint8_t enc, *len = msgb_tl_put(msg, GSM0808_IE_GLOBAL_CALL_REF); + + enc = osmo_enc_gcr(msg, g); + if (!enc) + return 0; + + *len = enc; + return enc + 2; /* type (1 byte) + length (1 byte) */ +} + +/*! Decode BSSMAP Global Call Reference, 3GPP TS 29.205 Table B 2.1.9.1. + * \param[out] gcr Caller-provided memory to store Global Call Reference + * \param[in] elem IE value to be decoded + * \param[in] len Length of \a elem in bytes + * \returns number of bytes parsed; negative on error */ +int gsm0808_dec_gcr(struct osmo_gcr_parsed *gcr, const struct tlv_parsed *tp) +{ + int ret; + const uint8_t *buf = TLVP_VAL_MINLEN(tp, GSM0808_IE_GLOBAL_CALL_REF, OSMO_GCR_MIN_LEN); + if (!buf) + return -EINVAL; + + ret = osmo_dec_gcr(gcr, buf, TLVP_LEN(tp, GSM0808_IE_GLOBAL_CALL_REF)); + if (ret < 0) + return -ENOENT; + + return 2 + ret; +} + /*! Encode TS 08.08 Encryption Information IE * \param[out] msg Message Buffer to which IE is to be appended * \param[in] ei Encryption Information to be encoded |