Mercurial > hg > svcore
view data/fileio/MatrixFile.h @ 764:95d4a59295b7 qt5
Fix typo in signal name
author | Chris Cannam |
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date | Tue, 12 Mar 2013 16:34:10 +0000 |
parents | 60482f13e627 |
children | 59e7fe1b1003 |
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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 2006-2009 Chris Cannam and QMUL. 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, WriteOnly }; /** * 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 WriteOnly, the file must not exist. * * 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. * * width and height specify the dimensions of the file. These * cannot be changed after construction. * * MatrixFiles are reference counted by name. When the last * MatrixFile with a given name is destroyed, the file is removed. * These are temporary files; the normal usage is to have one * MatrixFile of WriteOnly type creating the file and then * persisting until all readers are complete. * * MatrixFile has no built-in cache and is not thread-safe. Use a * separate MatrixFile in each thread. */ MatrixFile(QString fileBase, Mode mode, size_t cellSize, size_t width, size_t height); 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; } /** * If this is set true on a write-mode MatrixFile, then the file * will close() itself when all columns have been written. */ void setAutoClose(bool a) { m_autoClose = a; } void close(); // does not decrement ref count; that happens in dtor bool haveSetColumnAt(size_t x) const; void getColumnAt(size_t x, void *data); // may throw FileReadFailed void setColumnAt(size_t x, const void *data); 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; ResizeableBitset *m_setColumns; // only in writer bool m_autoClose; // In reader: if this is >= 0, we can read that column directly // without seeking (and we know that the column exists) mutable int m_readyToReadColumn; static std::map<QString, int> m_refcount; static QMutex m_createMutex; void initialise(); bool seekTo(size_t x) const; }; #endif