src/common/compressor.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2018 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 #pragma once
  22
  23 #include <zlib.h>
  24
  25 #include <QObject>
  26
  27 class QTcpSocket;
  28
  29 class Compressor : public QObject
  30 {
  31     Q_OBJECT
  32
  33 public:
  34     enum CompressionLevel {
  35         NoCompression,
  36         DefaultCompression,
  37         BestCompression,
  38         BestSpeed
  39     };
  40
  41     enum Error {
  42         NoError,
  43         StreamError,
  44         DeviceError
  45     };
  46
  47     enum WriteBufferHint {
  48         NoFlush,
  49         Flush
  50     };
  51
  52     Compressor(QTcpSocket *socket, CompressionLevel level, QObject *parent = 0);
  53     ~Compressor();
  54
  55     CompressionLevel compressionLevel() const { return _level; }
  56
  57     qint64 bytesAvailable() const;
  58
  59     qint64 read(char *data, qint64 maxSize);
  60     qint64 write(const char *data, qint64 count, WriteBufferHint flush = Flush);
  61
  62     void flush();
  63
  64 signals:
  65     void readyRead();
  66     void error(Compressor::Error errorCode = StreamError);
  67
  68 private slots:
  69     void readData();
  70
  71 private:
  72     bool initStreams();
  73     void writeData();
  74
  75 private:
  76     QTcpSocket *_socket;
  77     CompressionLevel _level;
  78
  79     QByteArray _readBuffer;
  80     QByteArray _writeBuffer;
  81
  82     QByteArray _inputBuffer;
  83     QByteArray _outputBuffer;
  84
  85     z_streamp _inflater;
  86     z_streamp _deflater;
  87 };