Add new function to get signatures from pages

zathura/page.c

@@ -412,3 +412,41 @@ zathura_page_get_label(zathura_page_t* page, zathura_error_t* error)
 
   return ret;
 }
+
+static void
+sig_free(void* sig)
+{
+  zathura_signature_info_free(sig);
+}
+
+girara_list_t*
+zathura_page_get_signatures(zathura_page_t* page, zathura_error_t* error)
+{
+  if (page == NULL || page->document == NULL) {
+    if (error) {
+      *error = ZATHURA_ERROR_INVALID_ARGUMENTS;
+    }
+    return NULL;
+  }
+
+  zathura_plugin_t*                 plugin    = zathura_document_get_plugin(page->document);
+  const zathura_plugin_functions_t* functions = zathura_plugin_get_functions(plugin);
+  if (functions->page_get_signatures == NULL) {
+    if (error) {
+      *error = ZATHURA_ERROR_NOT_IMPLEMENTED;
+    }
+    return NULL;
+  }
+
+  girara_list_t*  ret = girara_list_new2(sig_free);
+  zathura_error_t e   = functions->page_get_signatures(page, page->data, ret);
+  if (e != ZATHURA_ERROR_OK) {
+    if (error) {
+      *error = e;
+    }
+    girara_list_free(ret);
+    return NULL;
+  }
+
+  return ret;
+}

zathura/page.h

@@ -218,10 +218,20 @@ ZATHURA_PLUGIN_API zathura_error_t zathura_page_render(zathura_page_t* page, cai
  * is returned.
  *
  * @param page Page
- * @param error Set to an error value (see \ref zathura_Error_t) if an error
+ * @param error Set to an error value (see \ref zathura_error_t) if an error
  *    occurred.
  * @return Page label
  */
 ZATHURA_PLUGIN_API char* zathura_page_get_label(zathura_page_t* page, zathura_error_t* error);
 
+/**
+ * Get signatures of a page
+ *
+ * @param page Page
+ * @param error Set to an error value (see \ref zathura_error_t) if an error
+ *    occurred.
+ * @return List of signatures
+ */
+ZATHURA_PLUGIN_API girara_list_t* zathura_page_get_signatures(zathura_page_t* page, zathura_error_t* error);
+
 #endif // PAGE_H

zathura/plugin-api.h

@@ -108,6 +108,10 @@ typedef zathura_error_t (*zathura_plugin_page_render_cairo_t)(zathura_page_t* pa
  */
 typedef zathura_error_t (*zathura_plugin_page_get_label_t)(zathura_page_t* page, void* data, char** label);
 
+/**
+ * Get signatures
+ */
+typedef zathura_error_t (*zathura_plugin_page_get_signatures)(zathura_page_t* page, void* data, girara_list_t*);
 
 struct zathura_plugin_functions_s
 {
@@ -205,6 +209,11 @@ struct zathura_plugin_functions_s
    * Get page label.
    */
   zathura_plugin_page_get_label_t page_get_label;
+
+  /**
+   * Get signatures.
+   */
+  zathura_plugin_page_get_signatures page_get_signatures;
 };
 
 typedef struct zathura_plugin_version_s {