Header rewritten from the scratch.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3423 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/support/DataIO.h

@@ -0,0 +1,165 @@
+//------------------------------------------------------------------------------
+//	Copyright (c) 2001-2002, OpenBeOS
+//
+//	Permission is hereby granted, free of charge, to any person obtaining a
+//	copy of this software and associated documentation files (the "Software"),
+//	to deal in the Software without restriction, including without limitation
+//	the rights to use, copy, modify, merge, publish, distribute, sublicense,
+//	and/or sell copies of the Software, and to permit persons to whom the
+//	Software is furnished to do so, subject to the following conditions:
+//
+//	The above copyright notice and this permission notice shall be included in
+//	all copies or substantial portions of the Software.
+//
+//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+//	DEALINGS IN THE SOFTWARE.
+//
+//	File Name:		DataIO.cpp
+//	Author(s):		Ingo Weinhold (bonefish@users.sf.net)
+//					Stefano Ceccherini (burton666@libero.it)
+//					The Storage Team
+//	Description:	Pure virtual BDataIO and BPositionIO classes provide
+//					the protocol for Read()/Write()/Seek().
+//
+//					BMallocIO and BMemoryIO classes implement the protocol,
+//					as does BFile in the Storage Kit.
+//------------------------------------------------------------------------------
+#ifndef _DATA_IO_H
+#define _DATA_IO_H
+
+#include <SupportDefs.h>
+
+// DataIO
+class BDataIO {
+public:
+	BDataIO();
+	virtual ~BDataIO();
+
+	virtual ssize_t Read(void *buffer, size_t size) = 0;
+	virtual ssize_t Write(const void *buffer, size_t size) = 0;
+
+private:
+	BDataIO(const BDataIO &);
+	BDataIO &operator=(const BDataIO &);
+
+	virtual void _ReservedDataIO1();
+	virtual void _ReservedDataIO2();
+	virtual void _ReservedDataIO3();
+	virtual void _ReservedDataIO4();
+	virtual void _ReservedDataIO5();
+	virtual void _ReservedDataIO6();
+	virtual void _ReservedDataIO7();
+	virtual void _ReservedDataIO8();
+	virtual void _ReservedDataIO9();
+	virtual void _ReservedDataIO10();
+	virtual void _ReservedDataIO11();
+	virtual void _ReservedDataIO12();
+
+	uint32	_reserved[2];
+};
+
+// BPositionIO
+class BPositionIO : public BDataIO {
+public:
+	BPositionIO();
+	virtual ~BPositionIO();
+
+	virtual ssize_t Read(void *buffer, size_t size);
+	virtual ssize_t Write(const void *buffer, size_t size);
+
+	virtual ssize_t ReadAt(off_t position, void *buffer, size_t size) = 0;
+	virtual ssize_t WriteAt(off_t position, const void *buffer,
+							size_t size) = 0;
+
+	virtual off_t Seek(off_t position, uint32 seekMode) = 0;
+	virtual off_t Position() const = 0;
+
+	virtual status_t SetSize(off_t size);
+
+private:
+	virtual void _ReservedPositionIO1();
+	virtual void _ReservedPositionIO2();
+	virtual void _ReservedPositionIO3();
+	virtual void _ReservedPositionIO4();
+	virtual void _ReservedPositionIO5();
+	virtual void _ReservedPositionIO6();
+	virtual void _ReservedPositionIO7();
+	virtual void _ReservedPositionIO8();
+	virtual void _ReservedPositionIO9();
+	virtual void _ReservedPositionIO10();
+	virtual void _ReservedPositionIO11();
+	virtual void _ReservedPositionIO12();
+
+	uint32	_reserved[2];
+};
+
+// BMemoryIO
+class BMemoryIO : public BPositionIO {
+public:
+	BMemoryIO(void *data, size_t len);
+	BMemoryIO(const void *data, size_t len);
+	virtual ~BMemoryIO();
+
+	virtual ssize_t ReadAt(off_t position, void *buffer, size_t size);
+	virtual ssize_t WriteAt(off_t position, const void *buffer, size_t size);
+
+	virtual off_t Seek(off_t position, uint32 seekMode);
+	virtual off_t Position() const;
+
+	virtual status_t SetSize(off_t size);
+
+private:
+	BMemoryIO(const BMemoryIO &);
+	BMemoryIO &operator=(const BMemoryIO &);
+
+	virtual void _ReservedMemoryIO1();
+	virtual void _ReservedMemoryIO2();
+
+	bool	fReadOnly;
+	char	*fBuf;
+	size_t	fLen;
+	size_t	fPhys;
+	size_t	fPos;
+	uint32	_reserved[1];
+};
+
+// BMallocIO
+class BMallocIO : public BPositionIO {
+public:
+	BMallocIO();
+	virtual ~BMallocIO();
+
+	virtual ssize_t ReadAt(off_t position, void *buffer, size_t size);
+	virtual ssize_t WriteAt(off_t position, const void *buffer, size_t size);
+
+	virtual off_t Seek(off_t position, uint32 seekMode);
+	virtual off_t Position() const;
+
+	virtual status_t SetSize(off_t size);
+
+	void SetBlockSize(size_t blockSize);
+
+	const void *Buffer() const;
+	size_t BufferLength() const;
+
+private:
+	BMallocIO(const BMallocIO &);
+	BMallocIO &operator=(const BMallocIO &);
+
+	virtual void _ReservedMallocIO1();
+	virtual void _ReservedMallocIO2();
+
+	size_t	fBlockSize;
+	size_t	fMallocSize;
+	size_t	fLength;
+	char	*fData;
+	off_t	fPosition;
+	uint32	_reserved[1];
+};
+
+#endif	// _DATA_IO_H