1 files changed, 79 insertions, 0 deletions
diff --git a/src/zencore/stream.cpp b/src/zencore/stream.cpp
new file mode 100644
index 000000000..3402e51be
--- /dev/null
+++ b/src/zencore/stream.cpp
@@ -0,0 +1,79 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <stdarg.h>
+#include <zencore/memory.h>
+#include <zencore/stream.h>
+#include <zencore/testing.h>
+
+#include <algorithm>
+#include <stdexcept>
+
+namespace zen {
+
+void
+BinaryWriter::Write(std::initializer_list<const MemoryView> Buffers)
+{
+	size_t TotalByteCount = 0;
+	for (const MemoryView& View : Buffers)
+	{
+		TotalByteCount += View.GetSize();
+	}
+	const size_t NeedEnd = m_Offset + TotalByteCount;
+	if (NeedEnd > m_Buffer.size())
+	{
+		m_Buffer.resize(NeedEnd);
+	}
+	for (const MemoryView& View : Buffers)
+	{
+		memcpy(m_Buffer.data() + m_Offset, View.GetData(), View.GetSize());
+		m_Offset += View.GetSize();
+	}
+}
+
+void
+BinaryWriter::Write(const void* data, size_t ByteCount, uint64_t Offset)
+{
+	const size_t NeedEnd = Offset + ByteCount;
+
+	if (NeedEnd > m_Buffer.size())
+	{
+		m_Buffer.resize(NeedEnd);
+	}
+
+	memcpy(m_Buffer.data() + Offset, data, ByteCount);
+}
+
+void
+BinaryWriter::Reset()
+{
+	m_Buffer.clear();
+	m_Offset = 0;
+}
+
+//////////////////////////////////////////////////////////////////////////
+//
+// Testing related code follows...
+//
+
+#if ZEN_WITH_TESTS
+
+TEST_CASE("binary.writer.span")
+{
+	BinaryWriter	 Writer;
+	const MemoryView View1("apa", 3);
+	const MemoryView View2(" ", 1);
+	const MemoryView View3("banan", 5);
+	Writer.Write({View1, View2, View3});
+	MemoryView Result = Writer.GetView();
+	CHECK(Result.GetSize() == 9);
+	CHECK(memcmp(Result.GetData(), "apa banan", 9) == 0);
+}
+
+void
+stream_forcelink()
+{
+}
+
+#endif
+
+}  // namespace zen