Added a buffered DataIO subclass.

* Only the read path is tested so far.
2011-11-21 23:55:13 +01:00
parent 0cd972316d
commit 29e07dd0eb
3 changed files with 282 additions and 1 deletions
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2011, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _BUFFERED_DATA_IO_H
+#define _BUFFERED_DATA_IO_H
+
+
+#include <DataIO.h>
+
+
+class BBufferedDataIO : public BDataIO {
+public:
+								BBufferedDataIO(BDataIO& stream,
+									size_t bufferSize = 65536L,
+									bool ownsStream = true,
+									bool partialReads = false);
+	virtual						~BBufferedDataIO();
+
+			status_t			InitCheck() const;
+
+			BDataIO*			Stream() const;
+			size_t				BufferSize() const;
+			bool				OwnsStream() const;
+			void				SetOwnsStream(bool ownsStream);
+			status_t			Flush();
+
+	// BDataIO interface
+	virtual	ssize_t				Read(void* buffer, size_t size);
+	virtual	ssize_t				Write(const void* buffer, size_t size);
+
+private:
+	virtual	status_t			_Reserved0(void*);
+	virtual	status_t			_Reserved1(void*);
+	virtual	status_t			_Reserved2(void*);
+	virtual	status_t			_Reserved3(void*);
+	virtual	status_t			_Reserved4(void*);
+
+private:
+			BDataIO&			fStream;
+			uint8*				fBuffer;
+			size_t				fBufferSize;
+			size_t				fPosition;
+			size_t				fSize;
+
+			uint32				_reserved_ints[4];
+
+			bool				fDirty;
+			bool				fOwnsStream;
+			bool				fPartialReads;
+
+			bool				_reserved_bools[5];
+};
+
+
+#endif	// _BUFFERED_DATA_IO_H