From 54467c18b1038f4d82abd4c4a4627c920b6eb0d8 Mon Sep 17 00:00:00 2001
From: R2DLiu <zliu3301@gmail.com>
Date: Tue, 30 Jun 2020 21:52:44 -0400
Subject: [PATCH] File IO Functions

---
 Source/Core/Common/File.cpp | 19 +++++++++++++++++++
 Source/Core/Common/File.h   |  4 ++++
 2 files changed, 23 insertions(+)

diff --git a/Source/Core/Common/File.cpp b/Source/Core/Common/File.cpp
index 9dfcdbd7d8..6d86841733 100644
--- a/Source/Core/Common/File.cpp
+++ b/Source/Core/Common/File.cpp
@@ -34,6 +34,12 @@ IOFile::IOFile(const std::string& filename, const char openmode[]) : m_file(null
   Open(filename, openmode);
 }
 
+IOFile::IOFile(const std::string& filename, const char openmode[], int shflag)
+  : m_file(nullptr), m_good(true)
+{
+  OpenShared(filename, openmode, shflag);
+}
+
 IOFile::~IOFile()
 {
   Close();
@@ -69,6 +75,19 @@ bool IOFile::Open(const std::string& filename, const char openmode[])
   return m_good;
 }
 
+bool IOFile::OpenShared(const std::string& filename, const char openmode[], int shflag)
+{
+  Close();
+#ifdef _WIN32
+  m_file = _fsopen(filename.c_str(), openmode, shflag);
+#else
+  m_file = fopen(filename.c_str(), openmode);
+#endif
+
+  m_good = IsOpen();
+  return m_good;
+}
+
 bool IOFile::Close()
 {
   if (!IsOpen() || 0 != std::fclose(m_file))
diff --git a/Source/Core/Common/File.h b/Source/Core/Common/File.h
index 01b59af257..b38dbd75f8 100644
--- a/Source/Core/Common/File.h
+++ b/Source/Core/Common/File.h
@@ -21,6 +21,7 @@ public:
   IOFile();
   IOFile(std::FILE* file);
   IOFile(const std::string& filename, const char openmode[]);
+  IOFile(const std::string& filename, const char openmode[], int shflag);
 
   ~IOFile();
 
@@ -33,6 +34,9 @@ public:
   void Swap(IOFile& other) noexcept;
 
   bool Open(const std::string& filename, const char openmode[]);
+
+  bool OpenShared(const std::string& filename, const char openmode[], int shflag);
+
   bool Close();
 
   template <typename T>