From 724a3c0579ff09ac19de3744d60c937e46a172a5 Mon Sep 17 00:00:00 2001
From: Silent <zdanio95@gmail.com>
Date: Fri, 21 May 2021 17:51:26 +0200
Subject: [PATCH] Obtain file sizes without seeking where possible

---
 src/openrct2/core/File.cpp       |  4 +---
 src/openrct2/core/FileStream.cpp | 13 +++++++++----
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/openrct2/core/File.cpp b/src/openrct2/core/File.cpp
index 99bc40b93d..4e7eba3fea 100644
--- a/src/openrct2/core/File.cpp
+++ b/src/openrct2/core/File.cpp
@@ -57,8 +57,7 @@ namespace File
         }
 
         std::vector<uint8_t> result;
-        fs.seekg(0, std::ios::end);
-        auto fsize = static_cast<size_t>(fs.tellg());
+        auto fsize = Platform::GetFileSize(path);
         if (fsize > SIZE_MAX)
         {
             std::string message = String::StdFormat(
@@ -68,7 +67,6 @@ namespace File
         else
         {
             result.resize(fsize);
-            fs.seekg(0);
             fs.read(reinterpret_cast<char*>(result.data()), result.size());
             fs.exceptions(fs.failbit);
         }
diff --git a/src/openrct2/core/FileStream.cpp b/src/openrct2/core/FileStream.cpp
index 3a1ff1654b..3eb85d8987 100644
--- a/src/openrct2/core/FileStream.cpp
+++ b/src/openrct2/core/FileStream.cpp
@@ -1,5 +1,5 @@
 /*****************************************************************************
- * Copyright (c) 2014-2020 OpenRCT2 developers
+ * Copyright (c) 2014-2021 OpenRCT2 developers
  *
  * For a complete list of all authors, please refer to contributors.md
  * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
@@ -16,6 +16,8 @@
 
 #ifndef _WIN32
 #    include <sys/stat.h>
+#else
+#    include <io.h>
 #endif
 
 #if defined(__linux__) && !defined(__ANDROID__)
@@ -98,9 +100,12 @@ namespace OpenRCT2
             throw IOException(String::StdFormat("Unable to open '%s'", path));
         }
 
-        Seek(0, STREAM_SEEK_END);
-        _fileSize = GetPosition();
-        Seek(0, STREAM_SEEK_BEGIN);
+#ifdef _WIN32
+        _fileSize = _filelengthi64(_fileno(_file));
+#else
+        std::error_code ec;
+        _fileSize = fs::file_size(fs::u8path(path), ec);
+#endif
 
         _ownsFilePtr = true;
     }