MakeFromTemporaryFile() on POSIX

1 files changed, 26 insertions, 7 deletions

diff --git a/zencore/iobuffer.cpp b/zencore/iobuffer.cpp
index 16b530955..8e51f0872 100644
--- a/zencore/iobuffer.cpp
+++ b/zencore/iobuffer.cpp
@@ -413,6 +413,10 @@ IoBufferBuilder::MakeFromFile(const path_char_t* FileName, uint64_t Offset, uint
 IoBuffer
 IoBufferBuilder::MakeFromTemporaryFile(const path_char_t* FileName)
 {
+	uint64_t FileSize;
+	void* Handle;
+
+#if ZEN_PLATFORM_WINDOWS
 	CAtlFile DataFile;
 
 	// We need to open with DELETE since this is used for the case
@@ -421,18 +425,33 @@ IoBufferBuilder::MakeFromTemporaryFile(const path_char_t* FileName)
 
 	HRESULT hRes = DataFile.Create(FileName, GENERIC_READ | DELETE, FILE_SHARE_READ | FILE_SHARE_DELETE, OPEN_EXISTING);
 
-	if (SUCCEEDED(hRes))
+	if (FAILED(hRes))
 	{
-		ULONGLONG FileSize;
-		DataFile.GetSize(FileSize);
+		return {};
+	}
 
-		IoBuffer Iob(IoBuffer::File, DataFile.Detach(), 0, FileSize);
-		Iob.m_Core->SetIsWholeFile(true);
+	DataFile.GetSize((ULONGLONG&)FileSize);
 
-		return Iob;
+	Handle = DataFile.Detach();
+#else
+	int Fd = open(FileName, O_RDONLY);
+	if (Fd < 0)
+	{
+		return {};
 	}
 
-	return {};
+	static_assert(sizeof(decltype(stat::st_size)) == sizeof(uint64_t), "fstat() doesn't support large files");
+	struct stat Stat;
+	fstat(Fd, &Stat);
+	FileSize = Stat.st_size;
+
+	Handle = (void*)uintptr_t(Fd);
+#endif // ZEN_PLATFORM_WINDOWS
+
+	IoBuffer Iob(IoBuffer::File, Handle, 0, FileSize);
+	Iob.m_Core->SetIsWholeFile(true);
+
+	return Iob;
 }
 
 //////////////////////////////////////////////////////////////////////////