Add content_exec and associated vtable entry

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

content/content.c

@@ -545,6 +545,27 @@ void content__request_redraw(struct content *c,
 	content_broadcast(c, CONTENT_MSG_REDRAW, &data);
 }
 
+/* exported interface, documented in content/content.h */
+bool content_exec(struct hlcache_handle *h, const char *src, size_t srclen)
+{
+	struct content *c = hlcache_handle_get_content(h);
+	
+	assert(c != NULL);
+	
+	if (c->locked) {
+		/* Not safe to do stuff */
+		NSLOG(netsurf, DEEPDEBUG, "Unable to exec, content locked");
+		return false;
+	}
+	
+	if (c->handler->exec == NULL) {
+		/* Can't exec something on this content */
+		NSLOG(netsurf, DEEPDEBUG, "Unable to exec, no exec function");
+		return false;
+	}
+	
+	return c->handler->exec(c, src, srclen);
+}
 
 /* exported interface, documented in content/content.h */
 bool content_redraw(hlcache_handle *h, struct content_redraw_data *data,

content/content.h

@@ -387,6 +387,17 @@ bool content_get_quirks(struct hlcache_handle *h);
 bool content_is_locked(struct hlcache_handle *h);
 
 
+/**
+ * Execute some JavaScript code inside a content object.
+ *
+ * Runs the passed in JavaScript code in the content object's context.
+ *
+ * \param h The handle to the content
+ * \param src The JavaScript source code
+ * \param srclen The length of the source code
+ * \return Whether the JS function was successfully injected into the content
+ */
+bool content_exec(struct hlcache_handle *h, const char *src, size_t srclen);
 
 
 #endif

content/content_protected.h

@@ -81,6 +81,7 @@ struct content_handler {
 	content_type (*type)(void);
 	void (*add_user)(struct content *c);
 	void (*remove_user)(struct content *c);
+	bool (*exec)(struct content *c, const char *src, size_t srclen);
 
         /** handler dependant content sensitive internal data interface. */
 	void * (*get_internal)(const struct content *c, void *context);