X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=avahi-common%2Fstrlst.c;h=0c61857b5753dbc62a970417be34fa55542aef21;hb=e8e2707e96c08eda0ec6df2510dae4e6c71111ed;hp=d1e17be35f07899a6e846aff463959cc6eea1a56;hpb=eb3966f2d8bbfab5554b9312998e1d4812b0e28b;p=catta

diff --git a/avahi-common/strlst.c b/avahi-common/strlst.c
index d1e17be..0c61857 100644
--- a/avahi-common/strlst.c
+++ b/avahi-common/strlst.c
@@ -80,7 +80,9 @@ AvahiStringList *avahi_string_list_parse(const void* data, size_t size) {
             break;
 
         k = *(c++);
-        r = avahi_string_list_add_arbitrary(r, c, k);
+
+        if (k > 0) /* Ignore empty strings */
+            r = avahi_string_list_add_arbitrary(r, c, k);
         c += k;
 
         size -= 1 + k;
@@ -153,45 +155,64 @@ size_t avahi_string_list_serialize(AvahiStringList *l, void *data, size_t size)
     size_t used = 0;
 
     if (data) {
-        uint8_t *c;
-        AvahiStringList *n;
     
-        assert(data);
+        if (l) {
+            uint8_t *c;
+            AvahiStringList *n;
         
-        l = avahi_string_list_reverse(l);
-        c = data;
-        
-        for (n = l; n; n = n->next) {
-            size_t k;
-            if (size < 1)
-                break;
-            
-            k = n->size;
-            if (k > 255)
-                k = 255;
+            l = avahi_string_list_reverse(l);
+            c = data;
             
-            if (k > size-1)
-                k = size-1;
+            for (n = l; n; n = n->next) {
+                size_t k;
+                if (size < 1)
+                    break;
+                
+                k = n->size;
+                if (k > 255)
+                    k = 255;
+                
+                if (k > size-1)
+                    k = size-1;
+                
+                *(c++) = k;
+                memcpy(c, n->text, k);
+                c += k;
+                
+                used += 1+ k;
+            }
+        
+            l = avahi_string_list_reverse(l);
             
-            *(c++) = k;
-            memcpy(c, n->text, k);
-            c += k;
+        } else {
+
+            /* Empty lists are treated specially. To comply with
+             * section 6.1 of the DNS-SD spec, we return a single
+             * empty string (i.e. a NUL byte)*/
+
+            if (size > 0) {
+                *(uint8_t*) data = 0;
+                used = 1;
+            }
             
-            used += 1+ k;
         }
-        
-        l = avahi_string_list_reverse(l);
+            
     } else {
         AvahiStringList *n;
 
-        for (n = l; n; n = n->next) {
-            size_t k;
-        
-            k = n->size;
-            if (k > 255)
-                k = 255;
-            
-            used += 1+k;
+        if (!l)
+            used = 1;
+        else {
+
+            for (n = l; n; n = n->next) {
+                size_t k;
+                
+                k = n->size;
+                if (k > 255)
+                    k = 255;
+                
+                used += 1+k;
+            }
         }
     }