Core: Rename MemoryStream to MemoryView, add MemoryStream

Former-commit-id: c180d5f34fa7c477f35c4b70ebf7b64e3f35fe3d

src/Nazara/Core/MemoryView.cpp

@@ -0,0 +1,52 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Core/MemoryView.hpp>
+#include <algorithm>
+#include <cstring>
+#include <Nazara/Core/Debug.hpp>
+
+namespace Nz
+{
+	MemoryView::MemoryView(const void* ptr, UInt64 size) :
+	Stream(OpenMode_ReadOnly),
+	m_ptr(reinterpret_cast<const UInt8*>(ptr)),
+	m_pos(0),
+	m_size(size)
+	{
+	}
+
+	bool MemoryView::EndOfStream() const
+	{
+		return m_pos >= m_size;
+	}
+
+	UInt64 MemoryView::GetCursorPos() const
+	{
+		return m_pos;
+	}
+
+	UInt64 MemoryView::GetSize() const
+	{
+		return m_size;
+	}
+
+	std::size_t MemoryView::Read(void* buffer, std::size_t size)
+	{
+		std::size_t readSize = std::min<std::size_t>(size, static_cast<std::size_t>(m_size - m_pos));
+
+		if (buffer)
+			std::memcpy(buffer, &m_ptr[m_pos], readSize);
+
+		m_pos += readSize;
+		return readSize;
+	}
+
+	bool MemoryView::SetCursorPos(UInt64 offset)
+	{
+		m_pos = std::min(offset, m_size);
+
+		return true;
+	}
+}