src/common/compressor.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2019 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  19  ***************************************************************************/
  20
  21 #pragma once
  22
  23 #include <QObject>
  24
  25 #include <zlib.h>
  26
  27 class QTcpSocket;
  28
  29 class Compressor : public QObject
  30 {
  31     Q_OBJECT
  32
  33 public:
  34     enum CompressionLevel
  35     {
  36         NoCompression,
  37         DefaultCompression,
  38         BestCompression,
  39         BestSpeed
  40     };
  41
  42     enum Error
  43     {
  44         NoError,
  45         StreamError,
  46         DeviceError
  47     };
  48
  49     enum WriteBufferHint
  50     {
  51         NoFlush,
  52         Flush
  53     };
  54
  55     Compressor(QTcpSocket* socket, CompressionLevel level, QObject* parent = nullptr);
  56     ~Compressor() override;
  57
  58     CompressionLevel compressionLevel() const { return _level; }
  59
  60     qint64 bytesAvailable() const;
  61
  62     qint64 read(char* data, qint64 maxSize);
  63     qint64 write(const char* data, qint64 count, WriteBufferHint flush = Flush);
  64
  65     void flush();
  66
  67 signals:
  68     void readyRead();
  69     void error(Compressor::Error errorCode = StreamError);
  70
  71 private slots:
  72     void readData();
  73
  74 private:
  75     bool initStreams();
  76     void writeData();
  77
  78 private:
  79     QTcpSocket* _socket;
  80     CompressionLevel _level;
  81
  82     QByteArray _readBuffer;
  83     QByteArray _writeBuffer;
  84
  85     QByteArray _inputBuffer;
  86     QByteArray _outputBuffer;
  87
  88     z_streamp _inflater;
  89     z_streamp _deflater;
  90 };