From 835f14403d5f6e04d65b761857ee1271a4e7fe98 Mon Sep 17 00:00:00 2001
From: Stefan Boberg <stefan@boberg.org>
Date: Tue, 9 May 2023 17:19:57 +0200
Subject: add context to MapViewOfFile errors (#282)

* added FileSizeFromHandle function
* added file size to error message when MapViewOfFile fails
---
 src/zencore/filesystem.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'src/zencore/filesystem.cpp')

diff --git a/src/zencore/filesystem.cpp b/src/zencore/filesystem.cpp
index a17773024..8a6a9869c 100644
--- a/src/zencore/filesystem.cpp
+++ b/src/zencore/filesystem.cpp
@@ -1022,6 +1022,27 @@ PathFromHandle(void* NativeHandle)
 #endif	// ZEN_PLATFORM_WINDOWS
 }
 
+uint64_t
+FileSizeFromHandle(void* NativeHandle)
+{
+	uint64_t FileSize = ~0ull;
+
+#if ZEN_PLATFORM_WINDOWS
+	BY_HANDLE_FILE_INFORMATION Bhfh = {};
+	if (GetFileInformationByHandle(NativeHandle, &Bhfh))
+	{
+		FileSize = uint64_t(Bhfh.nFileSizeHigh) << 32 | Bhfh.nFileSizeLow;
+	}
+#else
+	int			Fd = int(intptr_t(NativeHandle));
+	struct stat Stat;
+	fstat(Fd, &Stat);
+	FileSize = size_t(Stat.st_size);
+#endif
+
+	return FileSize;
+}
+
 std::filesystem::path
 GetRunningExecutablePath()
 {
-- 
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