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         format_(format),
  40         options_(options),
  41         interrupt_(false)
  42 {
  43 }
  44
  45 void InputFile::open()
  46 {
  47         if (session_)
  48                 close();
  49         else
  50                 session_ = context_->create_session();
  51 }
  52
  53 void InputFile::close()
  54 {
  55         if (session_)
  56                 session_->remove_devices();
  57 }
  58
  59 void InputFile::start()
  60 {
  61 }
  62
  63 void InputFile::run()
  64 {
  65         char buffer[BufferSize];
  66         bool need_device = true;
  67
  68         assert(session_);
  69
  70         input_ = format_->create_input(options_);
  71
  72         if (!input_)
  73                 throw QString("Failed to create input");
  74
  75         interrupt_ = false;
  76         std::ifstream f(file_name_, std::ios::binary);
  77         while (!interrupt_ && f) {
  78                 f.read(buffer, BufferSize);
  79                 const std::streamsize size = f.gcount();
  80                 if (size == 0)
  81                         break;
  82
  83                 input_->send(buffer, size);
  84
  85                 if (need_device) {
  86                         try {
  87                                 device_ = input_->device();
  88                         } catch (sigrok::Error) {
  89                                 break;
  90                         }
  91
  92                         session_->remove_devices(); // Remove instance from previous run
  93                         session_->add_device(device_);
  94                         need_device = false;
  95                 }
  96
  97                 if (size != BufferSize)
  98                         break;
  99         }
 100
 101         input_->end();
 102 }
 103
 104 void InputFile::stop()
 105 {
 106         interrupt_ = true;
 107 }
 108
 109 } // namespace devices
 110 } // namespace pv