69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
//------------------------------------------------------------------------------
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// Copyright (c) 2001-2002, OpenBeOS
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// File Name: DataIO.cpp
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// Author(s): Ingo Weinhold (bonefish@users.sf.net)
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// Stefano Ceccherini (burton666@libero.it)
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// The Storage Team
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// Description: Pure virtual BDataIO and BPositionIO classes provide
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// the protocol for Read()/Write()/Seek().
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//
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// BMallocIO and ServerMemIO classes implement the protocol,
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// as does BFile in the Storage Kit.
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//------------------------------------------------------------------------------
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#ifndef _SERVERMEM_IO_H
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#define _SERVERMEM_IO_H
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#include <SupportDefs.h>
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#include <DataIO.h>
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#include <OS.h>
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class ServerMemIO : public BPositionIO
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{
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public:
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ServerMemIO(size_t size);
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virtual ~ServerMemIO();
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virtual ssize_t ReadAt(off_t position, void *buffer, size_t size);
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virtual ssize_t WriteAt(off_t position, const void *buffer, size_t size);
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virtual off_t Seek(off_t position, uint32 seekMode);
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virtual off_t Position() const;
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virtual status_t SetSize(off_t size);
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size_t GetSize(void) const;
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void *GetPointer(void) const;
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private:
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ServerMemIO(const ServerMemIO &);
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ServerMemIO &operator=(const ServerMemIO &);
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char *fBuf;
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size_t fLen;
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size_t fPhys;
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size_t fPos;
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size_t fOffset;
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area_id fArea, fSourceArea;
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};
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#endif
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