From 4021ed79d992dda1a66f926fa6fc19a48a191125 Mon Sep 17 00:00:00 2001
From: JamePeng <jame_peng@sina.com>
Date: Sat, 18 Jun 2016 08:30:55 +0800
Subject: [PATCH] Implement File_Util::GetFileModificationTimestamp function

---
 src/common/file_util.cpp | 16 ++++++++++++++++
 src/common/file_util.h   |  8 ++++++++
 2 files changed, 24 insertions(+)

diff --git a/src/common/file_util.cpp b/src/common/file_util.cpp
index c618495f7..a8302af14 100644
--- a/src/common/file_util.cpp
+++ b/src/common/file_util.cpp
@@ -100,6 +100,22 @@ bool Exists(const std::string& filename) {
     return (result == 0);
 }
 
+u64 GetFileModificationTimestamp(const std::string& filepath) {
+
+    if (FileUtil::Exists(filepath)) {
+        struct stat64 file_info;
+
+#ifdef _WIN32
+        if (0 == _wstat64(Common::UTF8ToUTF16W(filepath).c_str(), &file_info)) {
+#else
+        if (0 == stat64(filepath.c_str(), &file_info)) {
+#endif
+            return static_cast<u64>(file_info.st_mtime);
+        }
+    }
+    return 0;
+}
+
 // Returns true if filename is a directory
 bool IsDirectory(const std::string& filename) {
     struct stat file_info;
diff --git a/src/common/file_util.h b/src/common/file_util.h
index ac58607c5..3bff9e8a5 100644
--- a/src/common/file_util.h
+++ b/src/common/file_util.h
@@ -63,6 +63,14 @@ struct FSTEntry {
 // Returns true if file filename exists
 bool Exists(const std::string& filename);
 
+/**
+ * Function GetFileModificationTimestamp
+ * Return file timestamp if the file exists, return 0 if file no exists
+ * Note :
+ *       Timestamp format: milliseconds since the Unix epoch
+ */
+u64 GetFileModificationTimestamp(const std::string& filepath);
+
 // Returns true if filename is a directory
 bool IsDirectory(const std::string& filename);