From 4f155022d8cd64a1a4795b851c49aa2633947740 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Sat, 2 Mar 2024 20:02:55 +0100 Subject: cbsp: Add osmo_cbsp_segmentation_cb for message segmentation 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 --- src/gsm/cbsp.c | 20 ++++++++++++++++++++ src/gsm/libosmogsm.map | 1 + 2 files changed, 21 insertions(+) (limited to 'src') 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; -- cgit v1.2.3