src/common/compressor.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2015 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 #ifdef HAVE_ZLIB
  29     typedef struct z_stream_s *z_streamp;
  30 #else
  31     typedef struct mz_stream_s *z_streamp;
  32 #endif
  33
  34 class Compressor : public QObject
  35 {
  36     Q_OBJECT
  37
  38 public:
  39     enum CompressionLevel {
  40         NoCompression,
  41         DefaultCompression,
  42         BestCompression,
  43         BestSpeed
  44     };
  45
  46     enum Error {
  47         NoError,
  48         StreamError,
  49         DeviceError
  50     };
  51
  52     enum WriteBufferHint {
  53         NoFlush,
  54         Flush
  55     };
  56
  57     Compressor(QTcpSocket *socket, CompressionLevel level, QObject *parent = 0);
  58     ~Compressor();
  59
  60     CompressionLevel compressionLevel() const { return _level; }
  61
  62     qint64 bytesAvailable() const;
  63
  64     qint64 read(char *data, qint64 maxSize);
  65     qint64 write(const char *data, qint64 count, WriteBufferHint flush = Flush);
  66
  67     void flush();
  68
  69 signals:
  70     void readyRead();
  71     void error(Compressor::Error errorCode = StreamError);
  72
  73 private slots:
  74     void readData();
  75
  76 private:
  77     bool initStreams();
  78     void writeData();
  79
  80 private:
  81     QTcpSocket *_socket;
  82     CompressionLevel _level;
  83
  84     QByteArray _readBuffer;
  85     QByteArray _writeBuffer;
  86
  87     QByteArray _inputBuffer;
  88     QByteArray _outputBuffer;
  89
  90     z_streamp _inflater;
  91     z_streamp _deflater;
  92 };
  93
  94 #endif