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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <cassert>
  21 #include <fstream>
  22 #include <vector>
  23
  24 #include <QDebug>
  25 #include <QString>
  26
  27 #include <pv/globalsettings.hpp>
  28
  29 #include "inputfile.hpp"
  30
  31 using sigrok::InputFormat;
  32
  33 using std::map;
  34 using std::out_of_range;
  35 using std::pair;
  36 using std::shared_ptr;
  37 using std::streamsize;
  38 using std::string;
  39 using std::ifstream;
  40 using std::ios;
  41 using std::vector;
  42
  43 namespace pv {
  44 namespace devices {
  45
  46 // Use a 4MB chunk size for reading a file into memory. Larger values don't
  47 // seem to provide any substancial performance improvements, but can cause
  48 // UI lag and a visually "stuttering" display of the data currently loading.
  49 const streamsize InputFile::BufferSize = (4 * 1024 * 1024);
  50
  51 InputFile::InputFile(const shared_ptr<sigrok::Context> &context,
  52         const string &file_name,
  53         shared_ptr<sigrok::InputFormat> format,
  54         const map<string, Glib::VariantBase> &options) :
  55         File(file_name),
  56         context_(context),
  57         format_(format),
  58         options_(options),
  59         interrupt_(false)
  60 {
  61 }
  62
  63 InputFile::InputFile(const shared_ptr<sigrok::Context> &context,
  64         QSettings &settings):
  65         File(""),
  66         context_(context),
  67         interrupt_(false)
  68 {
  69         file_name_ = settings.value("filename").toString().toStdString();
  70
  71         QString format_name = settings.value("format").toString();
  72
  73         // Find matching format
  74         const map<string, shared_ptr<InputFormat> > formats = context->input_formats();
  75
  76         try {
  77                 format_ = formats.at(format_name.toStdString());
  78
  79                 // Restore all saved options
  80                 int options = settings.value("options").toInt();
  81
  82                 for (int i = 0; i < options; i++) {
  83                         settings.beginGroup("option" + QString::number(i));
  84                         QString name = settings.value("name").toString();
  85                         options_[name.toStdString()] = GlobalSettings::restore_variantbase(settings);
  86                         settings.endGroup();
  87                 }
  88
  89         } catch (out_of_range) {
  90                 qWarning() << "Could not find input format" << format_name <<
  91                         "needed to restore session input file";
  92         }
  93 }
  94
  95 void InputFile::save_meta_to_settings(QSettings &settings)
  96 {
  97         settings.setValue("filename", QString::fromStdString(file_name_));
  98
  99         settings.setValue("format", QString::fromStdString(format_->name()));
 100
 101         settings.setValue("options", (int)options_.size());
 102
 103         int i = 0;
 104         for (pair<string, Glib::VariantBase> option : options_) {
 105                 settings.beginGroup("option" + QString::number(i));
 106                 settings.setValue("name", QString::fromStdString(option.first));
 107                 GlobalSettings::store_variantbase(settings, option.second);
 108                 settings.endGroup();
 109                 i++;
 110         }
 111 }
 112
 113 void InputFile::open()
 114 {
 115         if (session_)
 116                 close();
 117         else
 118                 session_ = context_->create_session();
 119
 120         if (!format_)
 121                 return;
 122
 123         input_ = format_->create_input(options_);
 124
 125         if (!input_)
 126                 throw QString("Failed to create input");
 127
 128         // open() should add the input device to the session but
 129         // we can't open the device without sending some data first
 130         f = new ifstream(file_name_, ios::binary);
 131
 132         vector<char> buffer(BufferSize);
 133
 134         f->read(buffer.data(), BufferSize);
 135         const streamsize size = f->gcount();
 136         if (size == 0)
 137                 return;
 138
 139         input_->send(buffer.data(), size);
 140
 141         try {
 142                 device_ = input_->device();
 143         } catch (sigrok::Error&) {
 144                 return;
 145         }
 146
 147         session_->add_device(device_);
 148 }
 149
 150 void InputFile::close()
 151 {
 152         if (session_)
 153                 session_->remove_devices();
 154 }
 155
 156 void InputFile::start()
 157 {
 158 }
 159
 160 void InputFile::run()
 161 {
 162         if (!input_)
 163                 return;
 164
 165         if (!f) {
 166                 // Previous call to run() processed the entire file already
 167                 f = new ifstream(file_name_, ios::binary);
 168                 input_->reset();
 169         }
 170
 171         vector<char> buffer(BufferSize);
 172
 173         interrupt_ = false;
 174         while (!interrupt_ && !f->eof()) {
 175                 f->read(buffer.data(), BufferSize);
 176                 const streamsize size = f->gcount();
 177                 if (size == 0)
 178                         break;
 179
 180                 input_->send(buffer.data(), size);
 181
 182                 if (size != BufferSize)
 183                         break;
 184         }
 185
 186         input_->end();
 187
 188         delete f;
 189         f = nullptr;
 190 }
 191
 192 void InputFile::stop()
 193 {
 194         interrupt_ = true;
 195 }
 196
 197 } // namespace devices
 198 } // namespace pv