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author | Harald Welte <laforge@osmocom.org> | 2024-03-02 20:02:55 +0100 |
---|---|---|
committer | Harald Welte <laforge@osmocom.org> | 2024-03-02 20:48:23 +0100 |
commit | 4f155022d8cd64a1a4795b851c49aa2633947740 (patch) | |
tree | f37d1b46c270bdd5c2622219b2a3f9a5ceb14678 /src/gsm | |
parent | 319a77e519bb2e7ba086290d5ed57af2c097a725 (diff) |
cbsp: Add osmo_cbsp_segmentation_cb for message segmentationlaforge/cbsp
This call-back can for example be used as segmentation call-back
for libosmo-netif stream_cli/stream_srv or directly for osmo_io.
Related: OS#5755
Change-Id: I5e922c54b3431d759b38e81e55076125c5a34008
Diffstat (limited to 'src/gsm')
-rw-r--r-- | src/gsm/cbsp.c | 20 | ||||
-rw-r--r-- | src/gsm/libosmogsm.map | 1 |
2 files changed, 21 insertions, 0 deletions
diff --git a/src/gsm/cbsp.c b/src/gsm/cbsp.c index 28852f6f..a5e58f4c 100644 --- a/src/gsm/cbsp.c +++ b/src/gsm/cbsp.c @@ -1567,6 +1567,26 @@ discard_msg: return rc; } +/*! call-back function to segment the data at message boundaries. + * Returns the size of the next message. If it returns -EAGAIN or a value larger than msgb_length() (message + * is incomplete), the caller (e.g. osmo_io) has to wait for more data to be read. */ +int osmo_cbsp_segmentation_cb(struct msgb *msg) +{ + const struct cbsp_header *h; + int len; + + if (msgb_length(msg) < sizeof(*h)) + return -EAGAIN; + + h = (const struct cbsp_header *) msg->data; + msg->l1h = msg->data; + msg->l2h = msg->data + sizeof(*h); + /* then read the length as specified in the header */ + len = h->len[0] << 16 | h->len[1] << 8 | h->len[2]; + + return sizeof(*h) + len; +} + /*! value_string[] for enum osmo_cbsp_cause. */ const struct value_string osmo_cbsp_cause_names[] = { { OSMO_CBSP_CAUSE_PARAM_NOT_RECOGNISED, "Parameter-not-recognised" }, diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map index db2dbcb7..2c4c621c 100644 --- a/src/gsm/libosmogsm.map +++ b/src/gsm/libosmogsm.map @@ -793,6 +793,7 @@ osmo_cbsp_encode; osmo_cbsp_decode; osmo_cbsp_recv_buffered; osmo_cbsp_errstr; +osmo_cbsp_segmentation_cb; osmo_i460_demux_in; osmo_i460_mux_enqueue; |