1 files changed, 147 insertions, 0 deletions
diff --git a/protocols/oscar/snac.c b/protocols/oscar/snac.c
new file mode 100644
index 00000000..8a75b2a0
--- /dev/null
+++ b/protocols/oscar/snac.c
@@ -0,0 +1,147 @@
+/*
+ *
+ * Various SNAC-related dodads... 
+ *
+ * outstanding_snacs is a list of aim_snac_t structs.  A SNAC should be added
+ * whenever a new SNAC is sent and it should remain in the list until the
+ * response for it has been receieved.  
+ *
+ * cleansnacs() should be called periodically by the client in order
+ * to facilitate the aging out of unreplied-to SNACs. This can and does
+ * happen, so it should be handled.
+ *
+ */
+
+#include <aim.h>
+
+static aim_snacid_t aim_newsnac(aim_session_t *sess, aim_snac_t *newsnac);
+
+/*
+ * Called from aim_session_init() to initialize the hash.
+ */
+void aim_initsnachash(aim_session_t *sess)
+{
+	int i;
+
+	for (i = 0; i < AIM_SNAC_HASH_SIZE; i++)
+		sess->snac_hash[i] = NULL;
+
+	return;
+}
+
+aim_snacid_t aim_cachesnac(aim_session_t *sess, const guint16 family, const guint16 type, const guint16 flags, const void *data, const int datalen)
+{
+	aim_snac_t snac;
+
+	snac.id = sess->snacid_next++;
+	snac.family = family;
+	snac.type = type;
+	snac.flags = flags;
+
+	if (datalen) {
+		if (!(snac.data = g_malloc(datalen)))
+			return 0; /* er... */
+		memcpy(snac.data, data, datalen);
+	} else
+		snac.data = NULL;
+
+	return aim_newsnac(sess, &snac);
+}
+
+/*
+ * Clones the passed snac structure and caches it in the
+ * list/hash.
+ */
+static aim_snacid_t aim_newsnac(aim_session_t *sess, aim_snac_t *newsnac)
+{
+	aim_snac_t *snac;
+	int index;
+
+	if (!newsnac)
+		return 0;
+
+	if (!(snac = g_malloc(sizeof(aim_snac_t))))
+		return 0;
+	memcpy(snac, newsnac, sizeof(aim_snac_t));
+	snac->issuetime = time(NULL);
+
+	index = snac->id % AIM_SNAC_HASH_SIZE;
+
+	snac->next = (aim_snac_t *)sess->snac_hash[index];
+	sess->snac_hash[index] = (void *)snac;
+
+	return snac->id;
+}
+
+/*
+ * Finds a snac structure with the passed SNAC ID, 
+ * removes it from the list/hash, and returns a pointer to it.
+ *
+ * The returned structure must be freed by the caller.
+ *
+ */
+aim_snac_t *aim_remsnac(aim_session_t *sess, aim_snacid_t id) 
+{
+	aim_snac_t *cur, **prev;
+	int index;
+
+	index = id % AIM_SNAC_HASH_SIZE;
+
+	for (prev = (aim_snac_t **)&sess->snac_hash[index]; (cur = *prev); ) {
+		if (cur->id == id) {
+			*prev = cur->next;
+			return cur;
+		} else
+			prev = &cur->next;
+	}
+
+	return cur;
+}
+
+/*
+ * This is for cleaning up old SNACs that either don't get replies or
+ * a reply was never received for.  Garabage collection. Plain and simple.
+ *
+ * maxage is the _minimum_ age in seconds to keep SNACs.
+ *
+ */
+void aim_cleansnacs(aim_session_t *sess, int maxage)
+{
+	int i;
+
+	for (i = 0; i < AIM_SNAC_HASH_SIZE; i++) {
+		aim_snac_t *cur, **prev;
+		time_t curtime;
+
+		if (!sess->snac_hash[i])
+			continue;
+
+		curtime = time(NULL); /* done here in case we waited for the lock */
+
+		for (prev = (aim_snac_t **)&sess->snac_hash[i]; (cur = *prev); ) {
+			if ((curtime - cur->issuetime) > maxage) {
+
+				*prev = cur->next;
+
+				/* XXX should we have destructors here? */
+				g_free(cur->data);
+				g_free(cur);
+
+			} else
+				prev = &cur->next;
+		}
+	}
+
+	return;
+}
+
+int aim_putsnac(aim_bstream_t *bs, guint16 family, guint16 subtype, guint16 flags, aim_snacid_t snacid)
+{
+
+	aimbs_put16(bs, family);
+	aimbs_put16(bs, subtype);
+	aimbs_put16(bs, flags);
+	aimbs_put32(bs, snacid);
+
+	return 10;
+}