diff options
Diffstat (limited to 'src/gsm/gsm0808_utils.c')
| -rw-r--r-- | src/gsm/gsm0808_utils.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/gsm/gsm0808_utils.c b/src/gsm/gsm0808_utils.c index 996456e1..73d9362e 100644 --- a/src/gsm/gsm0808_utils.c +++ b/src/gsm/gsm0808_utils.c @@ -988,6 +988,57 @@ int gsm0808_cell_id_list_add(struct gsm0808_cell_id_list2 *dst, const struct gsm return added; } +/*! Encode Cell Identifier IE (3GPP TS 48.008 3.2.2.17). + * \param[out] msg Message Buffer to which IE is to be appended + * \param[in] ci Cell ID to be encoded + * \returns number of bytes appended to \a msg */ +uint8_t gsm0808_enc_cell_id(struct msgb *msg, const struct gsm0808_cell_id *ci) +{ + uint8_t rc; + uint8_t *ie_tag; + struct gsm0808_cell_id_list2 cil = { + .id_discr = ci->id_discr, + .id_list = { ci->id }, + .id_list_len = 1, + }; + + OSMO_ASSERT(msg); + OSMO_ASSERT(ci); + + ie_tag = msg->tail; + rc = gsm0808_enc_cell_id_list2(msg, &cil); + + if (rc <= 0) + return rc; + + *ie_tag = GSM0808_IE_CELL_IDENTIFIER; + return rc; +} + +/*! Decode Cell Identifier IE (3GPP TS 48.008 3.2.2.17). + * \param[out] ci Caller-provided memory to store Cell ID. + * \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_cell_id(struct gsm0808_cell_id *ci, const uint8_t *elem, uint8_t len) +{ + struct gsm0808_cell_id_list2 cil; + int rc; + rc = gsm0808_dec_cell_id_list2(&cil, elem, len); + if (rc < 0) + return rc; + if (cil.id_discr == CELL_IDENT_BSS || cil.id_discr == CELL_IDENT_NO_CELL) { + if (cil.id_list_len != 0) + return -EINVAL; + } else { + if (cil.id_list_len != 1) + return -EINVAL; + } + ci->id_discr = cil.id_discr; + ci->id = cil.id_list[0]; + return rc; +} + /*! Convert the representation of the permitted speech codec identifier * that is used in struct gsm0808_channel_type to the speech codec * representation we use in struct gsm0808_speech_codec. |