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         if (!input_)
  42                 throw QString("Failed to create input");
  43 }
  44
  45 void InputFile::create() {
  46         session_ = context_->create_session();
  47 }
  48
  49 void InputFile::start() {
  50 }
  51
  52 void InputFile::run() {
  53         char buffer[BufferSize];
  54         bool need_device = true;
  55
  56         assert(session_);
  57         assert(input_);
  58
  59         interrupt_ = false;
  60         std::ifstream f(file_name_);
  61         while (!interrupt_ && f) {
  62                 f.read(buffer, BufferSize);
  63                 const std::streamsize size = f.gcount();
  64                 if (size == 0)
  65                         break;
  66
  67                 input_->send(buffer, size);
  68
  69                 if (need_device) {
  70                         try {
  71                                 device_ = input_->device();
  72                         } catch (sigrok::Error) {
  73                                 break;
  74                         }
  75
  76                         session_->add_device(device_);
  77                         need_device = false;
  78                 }
  79
  80                 if (size != BufferSize)
  81                         break;
  82         }
  83
  84         input_->end();
  85 }
  86
  87 void InputFile::stop() {
  88         interrupt_ = true;
  89 }
  90
  91 } // namespace devices
  92 } // namespace pv