basic group titles

toxcore/group.c

@@ -513,6 +513,29 @@ static int setnick(Group_Chats *g_c, int groupnumber, int peer_index, const uint
     return 0;
 }
 
+static int settitle(Group_Chats *g_c, int groupnumber, int peer_index, const uint8_t *title, uint16_t title_len)
+{
+    if (title_len > MAX_NAME_LENGTH || title_len == 0)
+        return -1;
+
+    Group_c *g = get_group_c(g_c, groupnumber);
+
+    if (!g)
+        return -1;
+
+    /* same as already set? */
+    if (g->title_len == title_len && !memcmp(g->title, title, title_len))
+        return 0;
+
+    memcpy(g->title, title, title_len);
+    g->title_len = title_len;
+
+    if (g_c->title_callback)
+        g_c->title_callback(g_c->m, groupnumber, peer_index, title, title_len, g_c->title_callback_userdata);
+
+    return 0;
+}
+
 static int remove_close_conn(Group_Chats *g_c, int groupnumber, int friendcon_id)
 {
     Group_c *g = get_group_c(g_c, groupnumber);
@@ -973,6 +996,17 @@ void g_callback_group_namelistchange(Group_Chats *g_c, void (*function)(Messenge
     g_c->group_namelistchange_userdata = userdata;
 }
 
+/* Set callback funciton for title changes.
+ *
+ * Function(Group_Chats *g_c, int groupnumber, int friendgroupnumber, uint8_t * title, uint16_t length, void *userdata)
+ */
+void g_callback_group_title(Group_Chats *g_c, void (*function)(Messenger *m, int, int, const uint8_t *, uint16_t,
+                             void *), void *userdata)
+{
+    g_c->title_callback = function;
+    g_c->title_callback_userdata = userdata;
+}
+
 /* Set a function to be called when a new peer joins a group chat.
  *
  * Function(void *group object (set with group_set_object), int groupnumber, int friendgroupnumber)
@@ -1102,6 +1136,23 @@ static int group_name_send(const Group_Chats *g_c, int groupnumber, const uint8_
     }
 }
 
+#define GROUP_MESSAGE_TITLE_ID 49
+
+/* set the group's title, limited to MAX_NAME_LENGTH
+ * return 0 on success
+ * return -1 on failure
+ */
+int group_title_send(const Group_Chats *g_c, int groupnumber, const uint8_t *title, uint16_t length)
+{
+    if (length > MAX_NAME_LENGTH)
+        return -1;
+
+    if (send_message_group(g_c, groupnumber, GROUP_MESSAGE_TITLE_ID, title, length))
+        return 0;
+    else
+        return -1;
+}
+
 static void handle_friend_invite_packet(Messenger *m, int32_t friendnumber, const uint8_t *data, uint16_t length)
 {
     Group_Chats *g_c = m->group_chat_object;
@@ -1664,6 +1715,12 @@ static void handle_message_packet_group(Group_Chats *g_c, int groupnumber, const
         }
         break;
 
+        case GROUP_MESSAGE_TITLE_ID: {
+            if (settitle(g_c, groupnumber, index, msg_data, msg_data_len) == -1)
+                return;
+        }
+        break;
+
         case PACKET_ID_MESSAGE: {
             if (msg_data_len == 0)
                 return;

toxcore/group.h

@@ -60,7 +60,7 @@ typedef struct {
 
 #define DESIRED_CLOSE_CONNECTIONS 4
 #define MAX_GROUP_CONNECTIONS 16
-#define GROUP_IDENTIFIER_LENGTH (1 + crypto_box_KEYBYTES) /* crypto_box_KEYBYTES so we can use new_symmetric_key(...) to fill it */
+#define GROUP_IDENTIFIER_LENGTH (1 + crypto_box_KEYBYTES) /* type + crypto_box_KEYBYTES so we can use new_symmetric_key(...) to fill it */
 
 enum {
     GROUPCHAT_CLOSE_NONE,
@@ -91,6 +91,9 @@ typedef struct {
 
     uint8_t identifier[GROUP_IDENTIFIER_LENGTH];
 
+    uint8_t title[MAX_NAME_LENGTH];
+    uint8_t title_len;
+
     uint32_t message_number;
     uint16_t lossy_message_number;
     uint16_t peer_number;
@@ -121,6 +124,8 @@ typedef struct {
     void *action_callback_userdata;
     void (*peer_namelistchange)(Messenger *m, int, int, uint8_t, void *);
     void *group_namelistchange_userdata;
+    void (*title_callback)(Messenger *m, int, int, const uint8_t *, uint16_t, void *);
+    void *title_callback_userdata;
 
     struct {
         int (*function)(void *, int, int, void *, const uint8_t *, uint16_t);