haiku/headers/private/app/ServerMemIO.h

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//------------------------------------------------------------------------------
// 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 ServerMemIO classes implement the protocol,
// as does BFile in the Storage Kit.
//------------------------------------------------------------------------------
#ifndef _SERVERMEM_IO_H
#define _SERVERMEM_IO_H
#include <SupportDefs.h>
#include <DataIO.h>
#include <OS.h>
class ServerMemIO : public BPositionIO
{
public:
ServerMemIO(size_t size);
virtual ~ServerMemIO();
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);
size_t GetSize(void) const;
void *GetPointer(void) const;
private:
ServerMemIO(const ServerMemIO &);
ServerMemIO &operator=(const ServerMemIO &);
char *fBuf;
size_t fLen;
size_t fPhys;
size_t fPos;
size_t fOffset;
area_id fArea, fSourceArea;
};
#endif