fileringbuffer.h

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00001 /***************************************************************************
00002                           ringbuffer.h  -  description
00003                              -------------------
00004     begin                : Sun March 21 2004
00005     copyright            : (C) 2004 by Martin Witte
00006     email                : witte@kawo1.rwth-aachen.de
00007  ***************************************************************************/
00008 
00009 /***************************************************************************
00010  *                                                                         *
00011  *   This program is free software; you can redistribute it and/or modify  *
00012  *   it under the terms of the GNU General Public License as published by  *
00013  *   the Free Software Foundation; either version 2 of the License, or     *
00014  *   (at your option) any later version.                                   *
00015  *                                                                         *
00016  ***************************************************************************/
00017 
00018 #ifndef _KRADIO_FILE_RING_BUFFER_H
00019 #define _KRADIO_FILE_RING_BUFFER_H
00020 
00021 #ifdef HAVE_CONFIG_H
00022 #include <config.h>
00023 #endif
00024 
00025 #include <qstring.h>
00026 #include <stdio.h>
00027 
00028 class FileRingBuffer
00029 {
00030 public:
00031     FileRingBuffer(const QString &filename, Q_UINT64 max_size);
00032     ~FileRingBuffer();
00033 
00034     bool       resize(const QString &filename, Q_UINT64 new_max_size);
00035 
00036     size_t     addData (const char *src, size_t size);
00037     size_t     takeData(char *dst, size_t size);
00038     Q_UINT64   removeData(Q_UINT64 size);
00039 
00040     const QString &getFileName () const { return m_FileName; }
00041     Q_UINT64       getMaxSize()   const { return m_MaxSize;  }
00042     Q_UINT64       getRealSize()  const { return m_RealSize; }
00043     Q_UINT64       getFillSize()  const { return m_FillSize; }
00044     Q_UINT64       getFreeSize()  const { return (m_Start + m_FillSize > m_RealSize) ? m_RealSize - m_FillSize : m_MaxSize - m_FillSize; }
00045 
00046     void       clear();
00047 
00048     bool           error()       const { return m_error; }
00049     const QString &errorString() const { return m_errorString; }
00050 
00051 protected:
00052     Q_UINT64    getFreeSpace(Q_UINT64 &size);  // returns position in file + size
00053     Q_UINT64    removeFreeSpace(Q_UINT64 size);
00054 
00055     Q_UINT64    getData(Q_UINT64 &size);  // returns position in file + size
00056 
00057 
00058     int        m_FileIdx;
00059     QString    m_BaseFileName;
00060     QString    m_FileName;
00061     FILE      *m_File;
00062     Q_UINT64   m_Start;
00063     Q_UINT64   m_MaxSize;
00064     Q_UINT64   m_RealSize;
00065     Q_UINT64   m_FillSize;
00066 
00067     QString   m_errorString;
00068     bool      m_error;
00069 };
00070 
00071 #endif

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