From 899cdb4c001ccaab4d40b7a33d6b584b5c7eb903 Mon Sep 17 00:00:00 2001
From: Michael Jumper <mike.jumper@guac-dev.org>
Date: Fri, 26 Feb 2016 23:44:58 -0800
Subject: [PATCH] GUAC-236: Fully implement sync instruction. Stub timestamp
 update for display.

---
 src/guacenc/display.c          | 14 ++++++++++++++
 src/guacenc/instruction-sync.c |  5 ++---
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/guacenc/display.c b/src/guacenc/display.c
index 6a1e32c8..9e18bd01 100644
--- a/src/guacenc/display.c
+++ b/src/guacenc/display.c
@@ -22,14 +22,28 @@
 
 #include "config.h"
 #include "display.h"
+#include "log.h"
 
+#include <guacamole/client.h>
 #include <guacamole/timestamp.h>
 
 #include <stdlib.h>
 
 int guacenc_display_sync(guacenc_display* display, guac_timestamp timestamp) {
+
+    /* Verify timestamp is not decreasing */
+    if (timestamp < display->last_sync) {
+        guacenc_log(GUAC_LOG_DEBUG, "Decreasing sync timestamp");
+        return 1;
+    }
+
+    /* Update timestamp of display */
+    display->last_sync = timestamp;
+
     /* STUB */
+
     return 0;
+
 }
 
 guacenc_display* guacenc_display_alloc() {
diff --git a/src/guacenc/instruction-sync.c b/src/guacenc/instruction-sync.c
index ab789724..64255100 100644
--- a/src/guacenc/instruction-sync.c
+++ b/src/guacenc/instruction-sync.c
@@ -75,9 +75,8 @@ int guacenc_handle_sync(guacenc_display* display, int argc, char** argv) {
     /* Parse arguments */
     guac_timestamp timestamp = guacenc_parse_timestamp(argv[0]);
 
-    /* STUB */
-    guacenc_log(GUAC_LOG_DEBUG, "sync: timestamp=%" PRId64, timestamp);
-    return 0;
+    /* Update timestamp / flush frame */
+    return guacenc_display_sync(display, timestamp);
 
 }