From 075d17f8ada47e990fe94606c3d21df409223465 Mon Sep 17 00:00:00 2001
From: Stefan Boberg <stefan@boberg.org>
Date: Tue, 2 May 2023 10:01:47 +0200
Subject: moved source directories into `/src` (#264)

* moved source directories into `/src`
* updated bundle.lua for new `src` path
* moved some docs, icon
* removed old test trees
---
 src/zencore/sharedbuffer.cpp | 146 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 src/zencore/sharedbuffer.cpp

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

diff --git a/src/zencore/sharedbuffer.cpp b/src/zencore/sharedbuffer.cpp
new file mode 100644
index 000000000..200e06972
--- /dev/null
+++ b/src/zencore/sharedbuffer.cpp
@@ -0,0 +1,146 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <zencore/sharedbuffer.h>
+
+#include <zencore/testing.h>
+
+#include <memory.h>
+
+#include <gsl/gsl-lite.hpp>
+
+namespace zen {
+
+//////////////////////////////////////////////////////////////////////////
+
+UniqueBuffer
+UniqueBuffer::Alloc(uint64_t Size)
+{
+	void*		  Buffer = Memory::Alloc(Size, 16);
+	IoBufferCore* Owner	 = new IoBufferCore(Buffer, Size);
+	Owner->SetIsOwnedByThis(true);
+	Owner->SetIsImmutable(false);
+
+	return UniqueBuffer(Owner);
+}
+
+UniqueBuffer
+UniqueBuffer::MakeMutableView(void* DataPtr, uint64_t Size)
+{
+	IoBufferCore* Owner = new IoBufferCore(DataPtr, Size);
+	Owner->SetIsImmutable(false);
+	return UniqueBuffer(Owner);
+}
+
+UniqueBuffer::UniqueBuffer(IoBufferCore* Owner) : m_Buffer(Owner)
+{
+}
+
+SharedBuffer
+UniqueBuffer::MoveToShared()
+{
+	return SharedBuffer(std::move(m_Buffer));
+}
+
+void
+UniqueBuffer::Reset()
+{
+	m_Buffer = nullptr;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+SharedBuffer::SharedBuffer(UniqueBuffer&& InBuffer) : m_Buffer(std::move(InBuffer.m_Buffer))
+{
+}
+
+SharedBuffer
+SharedBuffer::MakeOwned() const&
+{
+	if (IsOwned() || !m_Buffer)
+	{
+		return *this;
+	}
+	else
+	{
+		return Clone(GetView());
+	}
+}
+
+SharedBuffer
+SharedBuffer::MakeOwned() &&
+{
+	if (IsOwned())
+	{
+		return std::move(*this);
+	}
+	else
+	{
+		return Clone(GetView());
+	}
+}
+
+SharedBuffer
+SharedBuffer::MakeView(MemoryView View, SharedBuffer OuterBuffer)
+{
+	if (OuterBuffer)
+	{
+		ZEN_ASSERT(OuterBuffer.GetView().Contains(View));
+	}
+
+	if (View == OuterBuffer.GetView())
+	{
+		// Reference to the full buffer contents, so just return the "outer"
+		return OuterBuffer;
+	}
+
+	IoBufferCore* NewCore = new IoBufferCore(OuterBuffer.m_Buffer, View.GetData(), View.GetSize());
+	NewCore->SetIsImmutable(true);
+	return SharedBuffer(NewCore);
+}
+
+SharedBuffer
+SharedBuffer::MakeView(const void* Data, uint64_t Size)
+{
+	return SharedBuffer(new IoBufferCore(const_cast<void*>(Data), Size));
+}
+
+SharedBuffer
+SharedBuffer::Clone()
+{
+	const uint64_t Size		= GetSize();
+	void*		   Buffer	= Memory::Alloc(Size, 16);
+	auto		   NewOwner = new IoBufferCore(Buffer, Size);
+	NewOwner->SetIsOwnedByThis(true);
+	memcpy(Buffer, m_Buffer->DataPointer(), Size);
+
+	return SharedBuffer(NewOwner);
+}
+
+SharedBuffer
+SharedBuffer::Clone(MemoryView View)
+{
+	const uint64_t Size		= View.GetSize();
+	void*		   Buffer	= Memory::Alloc(Size, 16);
+	auto		   NewOwner = new IoBufferCore(Buffer, Size);
+	NewOwner->SetIsOwnedByThis(true);
+	memcpy(Buffer, View.GetData(), Size);
+
+	return SharedBuffer(NewOwner);
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+#if ZEN_WITH_TESTS
+
+void
+sharedbuffer_forcelink()
+{
+}
+
+TEST_CASE("SharedBuffer")
+{
+}
+
+#endif
+
+}  // namespace zen
-- 
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