Remove ATL header usage (#306)

ATL has been used here and there as a convenience. Given that this is a legacy component and not always something which gets installed along with the compiler we hereby remove the dependency altogether in favour of our own simple wrappers

1 files changed, 64 insertions, 0 deletions

diff --git a/src/zencore/windows.cpp b/src/zencore/windows.cpp
new file mode 100644
index 000000000..76d8ab445
--- /dev/null
+++ b/src/zencore/windows.cpp
@@ -0,0 +1,64 @@
+
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include "zencore/zencore.h"
+
+#if ZEN_PLATFORM_WINDOWS
+#	include <zencore/except.h>
+#	include "zencore/windows.h"
+
+namespace zen::windows {
+
+FileMapping::FileMapping(_In_ FileMapping& orig)
+{
+	m_pData	   = NULL;
+	m_hMapping = NULL;
+
+	HRESULT hr = CopyFrom(orig);
+	if (FAILED(hr))
+		zen::ThrowSystemException(hr, "Failed to clone FileMapping");
+}
+
+FileMapping&
+FileMapping::operator=(_In_ FileMapping& orig)
+{
+	HRESULT hr = CopyFrom(orig);
+	if (FAILED(hr))
+		zen::ThrowSystemException(hr, "Failed to clone FileMapping");
+
+	return *this;
+}
+
+HRESULT
+FileMapping::CopyFrom(_In_ FileMapping& orig) throw()
+{
+	if (this == &orig)
+		return S_OK;
+
+	ZEN_ASSERT(m_pData == NULL);
+	ZEN_ASSERT(m_hMapping == NULL);
+	ZEN_ASSERT(orig.m_pData != NULL);
+
+	m_dwViewDesiredAccess = orig.m_dwViewDesiredAccess;
+	m_nOffset.QuadPart	  = orig.m_nOffset.QuadPart;
+	m_nMappingSize		  = orig.m_nMappingSize;
+
+	if (!::DuplicateHandle(GetCurrentProcess(), orig.m_hMapping, GetCurrentProcess(), &m_hMapping, NULL, TRUE, DUPLICATE_SAME_ACCESS))
+		return MapHresultFromLastError();
+
+	m_pData = ::MapViewOfFileEx(m_hMapping, m_dwViewDesiredAccess, m_nOffset.HighPart, m_nOffset.LowPart, m_nMappingSize, NULL);
+	if (m_pData == NULL)
+	{
+		HRESULT hr;
+
+		hr = MapHresultFromLastError();
+		::CloseHandle(m_hMapping);
+		m_hMapping = NULL;
+		return hr;
+	}
+
+	return S_OK;
+}
+
+}  // namespace zen::windows
+#endif