From 23af2d30412f80672510470b4c913b106ca19ecb Mon Sep 17 00:00:00 2001
From: Michael Jumper <mike.jumper@guac-dev.org>
Date: Fri, 26 Feb 2016 23:25:10 -0800
Subject: [PATCH] GUAC-236: Handle sync instruction.

---
 src/guacenc/Makefile.am        |  1 +
 src/guacenc/instruction-sync.c | 82 ++++++++++++++++++++++++++++++++++
 src/guacenc/instructions.c     |  1 +
 src/guacenc/instructions.h     |  5 +++
 4 files changed, 89 insertions(+)
 create mode 100644 src/guacenc/instruction-sync.c

diff --git a/src/guacenc/Makefile.am b/src/guacenc/Makefile.am
index 102d579d..7824cf14 100644
--- a/src/guacenc/Makefile.am
+++ b/src/guacenc/Makefile.am
@@ -44,6 +44,7 @@ guacenc_SOURCES =          \
     instruction-rect.c     \
     instruction-shade.c    \
     instruction-size.c     \
+    instruction-sync.c     \
     instruction-transfer.c \
     log.c
 
diff --git a/src/guacenc/instruction-sync.c b/src/guacenc/instruction-sync.c
new file mode 100644
index 00000000..5f818743
--- /dev/null
+++ b/src/guacenc/instruction-sync.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2016 Glyptodon, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "config.h"
+#include "log.h"
+
+#include <guacamole/client.h>
+#include <guacamole/timestamp.h>
+
+#include <inttypes.h>
+#include <stdlib.h>
+
+/**
+ * Parses a guac_timestamp from the given string. The string is assumed to
+ * consist solely of decimal digits with an optional leading minus sign. If the
+ * given string contains other characters, the behavior of this function is
+ * undefined.
+ *
+ * @param str
+ *     The string to parse, which must contain only decimal digits and an
+ *     optional leading minus sign.
+ *
+ * @return
+ *     A guac_timestamp having the same value as the provided string.
+ */
+static guac_timestamp guacenc_parse_timestamp(const char* str) {
+
+    int sign = 1;
+    int64_t num = 0;
+
+    for (; *str != '\0'; str++) {
+
+        /* Flip sign for each '-' encountered */
+        if (*str == '-')
+            sign = -sign;
+
+        /* If not '-', assume the character is a digit */
+        else
+            num = num * 10 + (*str - '0');
+
+    }
+
+    return (guac_timestamp) (num * sign);
+
+}
+
+int guacenc_handle_sync(int argc, char** argv) {
+
+    /* Verify argument count */
+    if (argc < 1) {
+        guacenc_log(GUAC_LOG_DEBUG, "\"sync\" instruction incomplete");
+        return 1;
+    }
+
+    /* Parse arguments */
+    guac_timestamp timestamp = guacenc_parse_timestamp(argv[0]);
+
+    /* STUB */
+    guacenc_log(GUAC_LOG_DEBUG, "sync: timestamp=%" PRId64, timestamp);
+    return 0;
+
+}
+
diff --git a/src/guacenc/instructions.c b/src/guacenc/instructions.c
index 81329cf2..d2324096 100644
--- a/src/guacenc/instructions.c
+++ b/src/guacenc/instructions.c
@@ -32,6 +32,7 @@ guacenc_instruction_handler_mapping guacenc_instruction_handler_map[] = {
     {"blob",     guacenc_handle_blob},
     {"img",      guacenc_handle_img},
     {"end",      guacenc_handle_end},
+    {"sync",     guacenc_handle_sync},
     {"cursor",   guacenc_handle_cursor},
     {"copy",     guacenc_handle_copy},
     {"transfer", guacenc_handle_transfer},
diff --git a/src/guacenc/instructions.h b/src/guacenc/instructions.h
index 5f8d6728..0139ddb4 100644
--- a/src/guacenc/instructions.h
+++ b/src/guacenc/instructions.h
@@ -108,6 +108,11 @@ guacenc_instruction_handler guacenc_handle_img;
  */
 guacenc_instruction_handler guacenc_handle_end;
 
+/**
+ * Handler for the Guacamole "sync" instruction.
+ */
+guacenc_instruction_handler guacenc_handle_sync;
+
 /**
  * Handler for the Guacamole "cursor" instruction.
  */