From 8c4603c73675958efc960fbd4bb599a2909d106a Mon Sep 17 00:00:00 2001
From: Konstantin <const@const.me>
Date: Mon, 16 Jan 2023 14:52:43 +0100
Subject: Source codes

---
 ComLightLib/streams.h | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 ComLightLib/streams.h

(limited to 'ComLightLib/streams.h')

diff --git a/ComLightLib/streams.h b/ComLightLib/streams.h
new file mode 100644
index 0000000..87680e1
--- /dev/null
+++ b/ComLightLib/streams.h
@@ -0,0 +1,61 @@
+#pragma once
+#include <vector>
+#include "comLightCommon.h"
+
+// COM interfaces to marshal streams across the interop.
+namespace ComLight
+{
+	enum struct eSeekOrigin : uint8_t
+	{
+		Begin = 0,
+		Current = 1,
+		End = 2
+	};
+
+	namespace details
+	{
+		template<class E>
+		inline size_t sizeofVector( const std::vector<E>& vec )
+		{
+			return sizeof( E ) * vec.size();
+		}
+	}
+
+	// COM interface for readonly stream. You'll get these interfaces what you use [ReadStream] attribute in C#.
+	struct DECLSPEC_NOVTABLE iReadStream : public IUnknown
+	{
+		DEFINE_INTERFACE_ID( "006af6db-734e-4595-8c94-19304b2389ac" );
+
+		virtual HRESULT COMLIGHTCALL read( void* lpBuffer, int nNumberOfBytesToRead, int &lpNumberOfBytesRead ) = 0;
+		virtual HRESULT COMLIGHTCALL seek( int64_t offset, eSeekOrigin origin ) = 0;
+		virtual HRESULT COMLIGHTCALL getPosition( int64_t& position ) = 0;
+		virtual HRESULT COMLIGHTCALL getLength( int64_t& length ) = 0;
+
+		template<class E>
+		inline HRESULT read( std::vector<E>& vec )
+		{
+			const int cb = (int)details::sizeofVector( vec );
+			int cbRead = 0;
+			CHECK( read( vec.data(), cb, cbRead ) );
+			if( cbRead >= cb )
+				return S_OK;
+			return E_EOF;
+		}
+	};
+
+	// COM interface for readonly stream. You'll get these interfaces what you use [WriteStream] attribute in C#.
+	struct DECLSPEC_NOVTABLE iWriteStream : public IUnknown
+	{
+		DEFINE_INTERFACE_ID( "d7c3eb39-9170-43b9-ba98-2ea1f2fed8a8" );
+
+		virtual HRESULT COMLIGHTCALL write( const void* lpBuffer, int nNumberOfBytesToWrite ) = 0;
+		virtual HRESULT COMLIGHTCALL flush() = 0;
+
+		template<class E>
+		inline HRESULT write( const std::vector<E>& vec )
+		{
+			const int cb = (int)details::sizeofVector( vec );
+			return write( vec.data(), cb );
+		}
+	};
+}
\ No newline at end of file
-- 
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