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constify msgb param in osmo_sccp_to_xua()/osmo_sua_to_sccp()

Change-Id: Ibd39b2157550d365a04872f96243d0685c17a6e3
---
M src/sccp2sua.c
M src/xua_internal.h
2 files changed, 5 insertions(+), 5 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-sigtran refs/changes/95/41395/1

diff --git a/src/sccp2sua.c b/src/sccp2sua.c
index ffbfd2a..87d9d05 100644
--- a/src/sccp2sua.c
+++ b/src/sccp2sua.c
@@ -1427,7 +1427,7 @@
 }
 
 /*! \returns \ref xua in case of success, NULL on error (xua not freed!) */
-static struct xua_msg *sccp_to_xua_ludt(struct msgb *msg, struct xua_msg *xua)
+static struct xua_msg *sccp_to_xua_ludt(const struct msgb *msg, struct xua_msg *xua)
 {
 	struct sccp_data_long_unitdata *ludt = (struct sccp_data_long_unitdata *)msg->l2h;
 
@@ -1664,7 +1664,7 @@
 /*! \brief convert SCCP message to a SUA message
  *  \param[in] msg message buffer holding SCCP message at l2h
  *  \returns callee-allocated xUA message on success; NULL on error */
-struct xua_msg *osmo_sccp_to_xua(struct msgb *msg)
+struct xua_msg *osmo_sccp_to_xua(const struct msgb *msg)
 {
 	struct xua_msg *xua;
 
@@ -1778,7 +1778,7 @@
 /*! \brief convert parsed SUA message to SCCP message
  *  \param[in] xua parsed SUA message to be converted
  *  \returns callee-allocated msgb containing encoded SCCP message */
-struct msgb *osmo_sua_to_sccp(struct xua_msg *xua)
+struct msgb *osmo_sua_to_sccp(const struct xua_msg *xua)
 {
 	struct msgb *msg = sccp_msgb_alloc("SCCP from SUA");
 	int rc;
diff --git a/src/xua_internal.h b/src/xua_internal.h
index 0061449..6cc0d72 100644
--- a/src/xua_internal.h
+++ b/src/xua_internal.h
@@ -16,8 +16,8 @@
 
 int sua_parse_gt(struct osmo_sccp_gt *gt, const uint8_t *data, unsigned int datalen);
 
-struct xua_msg *osmo_sccp_to_xua(struct msgb *msg);
-struct msgb *osmo_sua_to_sccp(struct xua_msg *xua);
+struct xua_msg *osmo_sccp_to_xua(const struct msgb *msg);
+struct msgb *osmo_sua_to_sccp(const struct xua_msg *xua);
 
 int sua_rx_msg(struct osmo_ss7_asp *asp, struct msgb *msg);
 

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