src/common/compressor.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2014 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
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   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
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  20
  21 #ifndef COMPRESSOR_H
  22 #define COMPRESSOR_H
  23
  24 #include <QObject>
  25
  26 class QTcpSocket;
  27
  28 typedef struct mz_stream_s *z_streamp;
  29
  30 class Compressor : public QObject
  31 {
  32     Q_OBJECT
  33
  34 public:
  35     enum CompressionLevel {
  36         NoCompression,
  37         DefaultCompression,
  38         BestCompression,
  39         BestSpeed
  40     };
  41
  42     enum Error {
  43         NoError,
  44         StreamError,
  45         DeviceError
  46     };
  47
  48     enum WriteBufferHint {
  49         NoFlush,
  50         Flush
  51     };
  52
  53     Compressor(QTcpSocket *socket, CompressionLevel level, QObject *parent = 0);
  54     ~Compressor();
  55
  56     CompressionLevel compressionLevel() const { return _level; }
  57
  58     qint64 bytesAvailable() const;
  59
  60     qint64 read(char *data, qint64 maxSize);
  61     qint64 write(const char *data, qint64 count, WriteBufferHint flush = Flush);
  62
  63     void flush();
  64
  65 signals:
  66     void readyRead();
  67     void error(Compressor::Error errorCode = StreamError);
  68
  69 private slots:
  70     void readData();
  71
  72 private:
  73     bool initStreams();
  74     void writeData();
  75
  76 private:
  77     QTcpSocket *_socket;
  78     CompressionLevel _level;
  79
  80     QByteArray _readBuffer;
  81     QByteArray _writeBuffer;
  82
  83     QByteArray _inputBuffer;
  84     QByteArray _outputBuffer;
  85
  86     z_streamp _inflater;
  87     z_streamp _deflater;
  88 };
  89
  90 #endif