pv/devices/inputfile.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2015 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <cassert>
  22 #include <fstream>
  23
  24 #include <QString>
  25
  26 #include "inputfile.hpp"
  27
  28 namespace pv {
  29 namespace devices {
  30
  31 const std::streamsize InputFile::BufferSize = 16384;
  32
  33 InputFile::InputFile(const std::shared_ptr<sigrok::Context> &context,
  34         const std::string &file_name,
  35         std::shared_ptr<sigrok::InputFormat> format,
  36         const std::map<std::string, Glib::VariantBase> &options) :
  37         File(file_name),
  38         context_(context),
  39         input_(format->create_input(options)),
  40         interrupt_(false)
  41 {
  42         if (!input_)
  43                 throw QString("Failed to create input");
  44 }
  45
  46 void InputFile::open()
  47 {
  48         if (session_)
  49                 close();
  50
  51         session_ = context_->create_session();
  52 }
  53
  54 void InputFile::close()
  55 {
  56         if (session_)
  57                 session_->remove_devices();
  58 }
  59
  60 void InputFile::start()
  61 {
  62 }
  63
  64 void InputFile::run()
  65 {
  66         char buffer[BufferSize];
  67         bool need_device = true;
  68
  69         assert(session_);
  70         assert(input_);
  71
  72         interrupt_ = false;
  73         std::ifstream f(file_name_);
  74         while (!interrupt_ && f) {
  75                 f.read(buffer, BufferSize);
  76                 const std::streamsize size = f.gcount();
  77                 if (size == 0)
  78                         break;
  79
  80                 input_->send(buffer, size);
  81
  82                 if (need_device) {
  83                         try {
  84                                 device_ = input_->device();
  85                         } catch (sigrok::Error) {
  86                                 break;
  87                         }
  88
  89                         session_->add_device(device_);
  90                         need_device = false;
  91                 }
  92
  93                 if (size != BufferSize)
  94                         break;
  95         }
  96
  97         input_->end();
  98 }
  99
 100 void InputFile::stop()
 101 {
 102         interrupt_ = true;
 103 }
 104
 105 } // namespace devices
 106 } // namespace pv