Add memory buffer stream

PortabilityLayer/MemReaderStream.cpp

@@ -1,4 +1,5 @@
 #include "MemReaderStream.h"
+#include "MemoryManager.h"
 
 #include <string.h>
 
@@ -11,6 +12,10 @@ namespace PortabilityLayer
 	{
 	}
 
+	MemReaderStream::~MemReaderStream()
+	{
+	}
+
 	size_t MemReaderStream::Read(void *bytesOut, size_t size)
 	{
 		size_t available = m_size - m_loc;
@@ -111,4 +116,32 @@ namespace PortabilityLayer
 	void MemReaderStream::Flush()
 	{
 	}
+
+
+	MemBufferReaderStream::~MemBufferReaderStream()
+	{
+		if (m_buffer)
+			MemoryManager::GetInstance()->Release(m_buffer);
+	}
+
+	MemBufferReaderStream *MemBufferReaderStream::Create(void *buffer, size_t size)
+	{
+		void *storage = MemoryManager::GetInstance()->Alloc(sizeof(MemBufferReaderStream));
+		if (!storage)
+			return nullptr;
+
+		return new (storage) MemBufferReaderStream(buffer, size);
+	}
+
+	void MemBufferReaderStream::Close()
+	{
+		this->~MemBufferReaderStream();
+		MemoryManager::GetInstance()->Release(this);
+	}
+
+	MemBufferReaderStream::MemBufferReaderStream(void *buffer, size_t size)
+		: MemReaderStream(buffer, size)
+		, m_buffer(buffer)
+	{
+	}
 }

PortabilityLayer/MemReaderStream.h

@@ -7,10 +7,11 @@
 
 namespace PortabilityLayer
 {
-	class MemReaderStream final : public GpIOStream
+	class MemReaderStream : public GpIOStream
 	{
 	public:
 		MemReaderStream(const void *memStream, size_t size);
+		virtual ~MemReaderStream();
 
 		size_t Read(void *bytesOut, size_t size) override;
 		size_t Write(const void *bytes, size_t size) override;
@@ -33,6 +34,22 @@ namespace PortabilityLayer
 		size_t m_size;
 		size_t m_loc;
 	};
+
+	class MemBufferReaderStream final : public MemReaderStream
+	{
+	public:
+		~MemBufferReaderStream() override;
+
+		static MemBufferReaderStream *Create(void *buffer, size_t size);
+
+		void Close() override;
+
+	private:
+		MemBufferReaderStream() GP_DELETED;
+		MemBufferReaderStream(void *buffer, size_t size);
+
+		void *m_buffer;
+	};
 }
 
 #endif