1b21be7091
it to the stream. This caused Read()/Write() to need two syscalls for nothing (this only caused the actual stream to share the same position with the BBufferIO, something you just cannot rely on when using buffered I/O). * Anyway, this reduces the time VirtualBox needs to open some RAW test images from over 4 minutes to less than 15 seconds... git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28662 a95241bf-73f2-0310-859d-f6bbb57e9c96
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
/*
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* Copyright 2007-2008, Haiku, Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _BUFFER_IO_H
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#define _BUFFER_IO_H
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#include <DataIO.h>
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class BBufferIO : public BPositionIO {
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public:
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BBufferIO(BPositionIO* stream, size_t bufferSize = 65536L,
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bool ownsStream = true);
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virtual ~BBufferIO();
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virtual ssize_t ReadAt(off_t pos, void* buffer, size_t size);
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virtual ssize_t WriteAt(off_t pos, 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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virtual status_t Flush();
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BPositionIO* Stream() const;
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size_t BufferSize() const;
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bool OwnsStream() const;
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void SetOwnsStream(bool ownsStream);
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void PrintToStream() const;
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private:
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virtual status_t _Reserved_BufferIO_0(void*);
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virtual status_t _Reserved_BufferIO_1(void*);
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virtual status_t _Reserved_BufferIO_2(void*);
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virtual status_t _Reserved_BufferIO_3(void*);
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virtual status_t _Reserved_BufferIO_4(void*);
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off_t fBufferStart;
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BPositionIO* fStream;
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char* fBuffer;
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size_t fBufferSize;
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size_t fBufferUsed;
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off_t fPosition;
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uint32 _reserved_ints[4];
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bool fBufferIsDirty;
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bool fOwnsStream;
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bool _reserved_bools[6];
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};
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#endif // _BUFFER_IO_H
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