Mercurial > hg > svcore
view data/fileio/MatrixFile.h @ 283:7336fe3a7caa
* Fix failure to properly load from text files with old-style Mac line endings
author | Chris Cannam |
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date | Thu, 09 Aug 2007 10:06:02 +0000 |
parents | 1a42221a1522 |
children | 3e0f1f7bec85 |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006 Chris Cannam. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. See the file COPYING included with this distribution for more information. */ #ifndef _MATRIX_FILE_CACHE_H_ #define _MATRIX_FILE_CACHE_H_ #include "base/ResizeableBitset.h" #include "FileReadThread.h" #include <sys/types.h> #include <QString> #include <QMutex> #include <map> class MatrixFile : public QObject { Q_OBJECT public: enum Mode { ReadOnly, ReadWrite }; /** * Construct a MatrixFile object reading from and/or writing to * the matrix file with the given base name in the application's * temporary directory. * * If mode is ReadOnly, the file must exist and be readable. * * If mode is ReadWrite and the file does not exist, it will be * created. If mode is ReadWrite and the file does exist, the * existing file will be used and the mode will be reset to * ReadOnly. Call getMode() to check whether this has occurred * after construction. * * cellSize specifies the size in bytes of the object type stored * in the matrix. For example, use cellSize = sizeof(float) for a * matrix of floats. The MatrixFile object doesn't care about the * objects themselves, it just deals with raw data of a given size. * * If eagerCache is true, blocks from the file will be cached for * read. If eagerCache is false, only columns that have been set * by calling setColumnAt on this MatrixFile (i.e. columns for * which haveSetColumnAt returns true) will be cached. */ MatrixFile(QString fileBase, Mode mode, size_t cellSize, bool eagerCache); virtual ~MatrixFile(); Mode getMode() const { return m_mode; } size_t getWidth() const { return m_width; } size_t getHeight() const { return m_height; } size_t getCellSize() const { return m_cellSize; } void resize(size_t width, size_t height); void reset(); bool haveSetColumnAt(size_t x) const { return m_columnBitset->get(x); } void getColumnAt(size_t x, void *data); void setColumnAt(size_t x, const void *data); void suspend(); protected: int m_fd; Mode m_mode; int m_flags; mode_t m_fmode; size_t m_cellSize; size_t m_width; size_t m_height; size_t m_headerSize; QString m_fileName; size_t m_defaultCacheWidth; size_t m_prevX; struct Cache { size_t x; size_t width; char *data; }; Cache m_cache; bool m_eagerCache; bool getFromCache(size_t x, size_t ystart, size_t ycount, void *data); void primeCache(size_t x, bool left); void resume(); bool seekTo(size_t x, size_t y); static FileReadThread *m_readThread; int m_requestToken; size_t m_requestingX; size_t m_requestingWidth; char *m_spareData; static std::map<QString, int> m_refcount; static QMutex m_refcountMutex; QMutex m_fdMutex; QMutex m_cacheMutex; typedef std::map<QString, ResizeableBitset *> ResizeableBitsetMap; static ResizeableBitsetMap m_columnBitsets; static QMutex m_columnBitsetWriteMutex; ResizeableBitset *m_columnBitset; }; #endif