Fix buffer shrinking logic in UTCP.

[meshlink] / src / utcp.c

diff --git a/src/utcp.c b/src/utcp.c
index c21e7067b89610c17182eae3dce57b58a9dfa274..8b3509ef0f5c376ee7b37640cb3c82dba1819df4 100644 (file)
--- a/src/utcp.c
+++ b/src/utcp.c
@@ -470,8 +470,13 @@ static void set_buffer_storage(struct buffer *buf, char *data, size_t size) {
 
                buf->external = false;
        } else {
+               // Don't do anything if the buffer wraps
+               if(buffer_wraps(buf)) {
+                       return;
+               }
+
                // Realloc internal storage
-               size_t minsize = buf->used <= DEFAULT_SNDBUFSIZE ? DEFAULT_SNDBUFSIZE : buf->used;
+               size_t minsize = max(DEFAULT_SNDBUFSIZE, buf->offset + buf->used);
 
                if(minsize) {
                        data = realloc(buf->data, minsize);
@@ -2108,8 +2113,8 @@ static bool reset_connection(struct utcp_connection *c) {
 }
 
 static void set_reapable(struct utcp_connection *c) {
-       set_buffer_storage(&c->sndbuf, NULL, DEFAULT_MTU);
-       set_buffer_storage(&c->rcvbuf, NULL, DEFAULT_MTU);
+       set_buffer_storage(&c->sndbuf, NULL, min(c->sndbuf.maxsize, DEFAULT_MAXSNDBUFSIZE));
+       set_buffer_storage(&c->rcvbuf, NULL, min(c->rcvbuf.maxsize, DEFAULT_MAXRCVBUFSIZE));
 
        c->recv = NULL;
        c->poll = NULL;