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include/fs/ISink.h

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+#pragma once
+
+#include "fs/IStreamSink.h"
+#include "tl/flag_set2.h"
+#include "fs/Api.h"
+
+namespace fs
+{
+
+class FS_API ISink : public IStreamSink
+{
+public:
+	enum class Flag
+	{
+	};
+	typedef tl::flag_set2<Flag> Flags;
+
+	ISink() = default;
+	~ISink() override = default;
+	
+	ISink(ISink&&) = default;
+	ISink& operator=(ISink&&) = default;
+
+	//changes the sink cursor either to an absolute offset or relative one
+	//NOTE!!! if the cursor is moved beyond the sink size, the size is increased to fit it.
+	virtual void seekBeg(uint64_t offset) = 0;
+	virtual void seekRel(int64_t offset) = 0;
+
+	//returns the sink cursor. Always between 0 and size
+	virtual uint64_t tell() const = 0;
+};
+
+}