strawberry-audio-player-windows-mac-linux/src/core/utilities.cpp

/*
 * Strawberry Music Player
 * This file was part of Clementine.
 * Copyright 2010, David Sansome <me@davidsansome.com>
 * Copyright 2018-2019, Jonas Kvinge <jonas@jkvinge.net>
 *
 * Strawberry is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Strawberry is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "config.h"

#include <memory>
#include <cstdlib>
#include <iconv.h>

#include <QtGlobal>
#include <QApplication>
#include <QCoreApplication>
#include <QWidget>
#include <QObject>
#include <QIODevice>
#include <QByteArray>
#include <QMetaObject>
#include <QChar>
#include <QCryptographicHash>
#include <QDate>
#include <QDateTime>
#include <QDesktopServices>
#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QProcess>
#include <QHostAddress>
#include <QSet>
#include <QList>
#include <QMap>
#include <QVariant>
#include <QString>
#include <QStringList>
#include <QUrl>
#include <QRegExp>
#include <QTcpServer>
#include <QTemporaryFile>
#include <QPoint>
#include <QRect>
#include <QSize>
#include <QColor>
#include <QMetaEnum>
#include <QXmlStreamReader>
#include <QSettings>
#include <QtEvents>
#include <QMessageBox>
#include <QNetworkInterface>
#include <QtDebug>
#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
#  include <QRandomGenerator>
#endif

#include <cstdio>

#ifdef Q_OS_LINUX
#  include <unistd.h>
#  include <sys/syscall.h>
#endif
#ifdef Q_OS_MACOS
#  include <sys/resource.h>
#  include <sys/sysctl.h>
#  include <sys/param.h>
#endif

#if defined(Q_OS_UNIX)
#  include <sys/statvfs.h>
#elif defined(Q_OS_WIN)
#  include <windows.h>
#endif

#ifdef Q_OS_MACOS
#  include "CoreServices/CoreServices.h"
#  include "IOKit/ps/IOPSKeys.h"
#  include "IOKit/ps/IOPowerSources.h"
#endif

#include "core/logging.h"
#include "core/song.h"

#include "utilities.h"
#include "timeconstants.h"
#include "application.h"

#ifdef Q_OS_MACOS
#  include "mac_startup.h"
#  include "mac_utilities.h"
#  include "scoped_cftyperef.h"
#endif

namespace Utilities {

static QString tr(const char *str) {
  return QCoreApplication::translate("", str);
}

QString PrettyTimeDelta(int seconds) {
  return (seconds >= 0 ? "+" : "-") + PrettyTime(seconds);
}

QString PrettyTime(int seconds) {

  // last.fm sometimes gets the track length wrong, so you end up with negative times.
  seconds = qAbs(seconds);

  int hours = seconds / (60 * 60);
  int minutes = (seconds / 60) % 60;
  seconds %= 60;

  QString ret;
  if (hours) ret = QString::asprintf("%d:%02d:%02d", hours, minutes, seconds);
  else ret = QString::asprintf("%d:%02d", minutes, seconds);

  return ret;

}

QString PrettyTimeNanosec(qint64 nanoseconds) {
  return PrettyTime(nanoseconds / kNsecPerSec);
}

QString WordyTime(quint64 seconds) {

  quint64 days = seconds / (60 * 60 * 24);

  // TODO: Make the plural rules translatable
  QStringList parts;

  if (days) parts << (days == 1 ? tr("1 day") : tr("%1 days").arg(days));
  parts << PrettyTime(seconds - days * 60 * 60 * 24);

  return parts.join(" ");

}

QString WordyTimeNanosec(qint64 nanoseconds) {
  return WordyTime(nanoseconds / kNsecPerSec);
}

QString Ago(int seconds_since_epoch, const QLocale &locale) {

  const QDateTime now = QDateTime::currentDateTime();
  const QDateTime then = QDateTime::fromTime_t(seconds_since_epoch);
  const int days_ago = then.date().daysTo(now.date());
  const QString time = then.time().toString(locale.timeFormat(QLocale::ShortFormat));

  if (days_ago == 0) return tr("Today") + " " + time;
  if (days_ago == 1) return tr("Yesterday") + " " + time;
  if (days_ago <= 7) return tr("%1 days ago").arg(days_ago);

  return then.date().toString(locale.dateFormat(QLocale::ShortFormat));

}

QString PrettyFutureDate(const QDate &date) {

  const QDate now = QDate::currentDate();
  const int delta_days = now.daysTo(date);

  if (delta_days < 0) return QString();
  if (delta_days == 0) return tr("Today");
  if (delta_days == 1) return tr("Tomorrow");
  if (delta_days <= 7) return tr("In %1 days").arg(delta_days);
  if (delta_days <= 14) return tr("Next week");

  return tr("In %1 weeks").arg(delta_days / 7);

}

QString PrettySize(quint64 bytes) {

  QString ret;

  if (bytes > 0) {
    if (bytes <= 1000)
      ret = QString::number(bytes) + " bytes";
    else if (bytes <= 1000 * 1000)
      ret = QString::asprintf("%.1f KB", float(bytes) / 1000);
    else if (bytes <= 1000 * 1000 * 1000)
      ret = QString::asprintf("%.1f MB", float(bytes) / (1000 * 1000));
    else
      ret = QString::asprintf("%.1f GB", float(bytes) / (1000 * 1000 * 1000));
  }
  return ret;

}

quint64 FileSystemCapacity(const QString &path) {

#if defined(Q_OS_UNIX)
  struct statvfs fs_info;
  if (statvfs(path.toLocal8Bit().constData(), &fs_info) == 0)
    return quint64(fs_info.f_blocks) * quint64(fs_info.f_bsize);
#elif defined(Q_OS_WIN32)
  _ULARGE_INTEGER ret;
  if (GetDiskFreeSpaceEx(QDir::toNativeSeparators(path).toLocal8Bit().constData(), nullptr,&ret, nullptr) != 0)
    return ret.QuadPart;
#endif

  return 0;

}

quint64 FileSystemFreeSpace(const QString &path) {

#if defined(Q_OS_UNIX)
  struct statvfs fs_info;
  if (statvfs(path.toLocal8Bit().constData(), &fs_info) == 0)
    return quint64(fs_info.f_bavail) * quint64(fs_info.f_bsize);
#elif defined(Q_OS_WIN32)
  _ULARGE_INTEGER ret;
  if (GetDiskFreeSpaceEx(QDir::toNativeSeparators(path).toLocal8Bit().constData(), &ret, nullptr, nullptr) != 0)
    return ret.QuadPart;
#endif

  return 0;

}

QString MakeTempDir(const QString template_name) {

  QString path;
  {
    QTemporaryFile tempfile;
    if (!template_name.isEmpty()) tempfile.setFileTemplate(template_name);

    tempfile.open();
    path = tempfile.fileName();
  }

  QDir d;
  d.mkdir(path);

  return path;

}

bool RemoveRecursive(const QString &path) {

  QDir dir(path);
  for (const QString &child : dir.entryList(QDir::NoDotAndDotDot | QDir::Dirs | QDir::Hidden)) {
    if (!RemoveRecursive(path + "/" + child))
      return false;
  }

  for (const QString &child : dir.entryList(QDir::NoDotAndDotDot | QDir::Files | QDir::Hidden)) {
    if (!QFile::remove(path + "/" + child))
      return false;
  }

  return dir.rmdir(path);

}

bool CopyRecursive(const QString &source, const QString &destination) {

  // Make the destination directory
  QString dir_name = source.section('/', -1, -1);
  QString dest_path = destination + "/" + dir_name;
  QDir().mkpath(dest_path);

  QDir dir(source);
  for (const QString &child : dir.entryList(QDir::NoDotAndDotDot | QDir::Dirs)) {
    if (!CopyRecursive(source + "/" + child, dest_path)) {
      qLog(Warning) << "Failed to copy dir" << source + "/" + child << "to" << dest_path;
      return false;
    }
  }

  for (const QString &child : dir.entryList(QDir::NoDotAndDotDot | QDir::Files)) {
    if (!QFile::copy(source + "/" + child, dest_path + "/" + child)) {
      qLog(Warning) << "Failed to copy file" << source + "/" + child << "to" << dest_path;
      return false;
    }
  }
  return true;

}

bool Copy(QIODevice *source, QIODevice *destination) {

  if (!source->open(QIODevice::ReadOnly)) return false;

  if (!destination->open(QIODevice::WriteOnly)) return false;

  const qint64 bytes = source->size();
  std::unique_ptr<char[]> data(new char[bytes]);
  qint64 pos = 0;

  qint64 bytes_read;
  do {
    bytes_read = source->read(data.get() + pos, bytes - pos);
    if (bytes_read == -1) return false;

    pos += bytes_read;
  } while (bytes_read > 0 && pos != bytes);

  pos = 0;
  qint64 bytes_written;
  do {
    bytes_written = destination->write(data.get() + pos, bytes - pos);
    if (bytes_written == -1) return false;

    pos += bytes_written;
  } while (bytes_written > 0 && pos != bytes);

  return true;

}

QString ColorToRgba(const QColor &c) {

  return QString("rgba(%1, %2, %3, %4)")
      .arg(c.red())
      .arg(c.green())
      .arg(c.blue())
      .arg(c.alpha());

}

#if defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)
void OpenInFileManager(const QString &path);
void OpenInFileManager(const QString &path) {

  QProcess proc;
  proc.start("xdg-mime", QStringList() << "query" << "default" << "inode/directory");
  proc.waitForFinished();
  QString desktop_file = proc.readLine().simplified();
  QStringList data_dirs = QString(getenv("XDG_DATA_DIRS")).split(":");

  QString command;
  QStringList command_params;
  for (const QString &data_dir : data_dirs) {
    QString desktop_file_path = QString("%1/applications/%2").arg(data_dir, desktop_file);
    if (!QFile::exists(desktop_file_path)) continue;
    QSettings setting(desktop_file_path, QSettings::IniFormat);
    setting.beginGroup("Desktop Entry");
    if (setting.contains("Exec")) {
      QString cmd = setting.value("Exec").toString();
      if (cmd.isEmpty()) break;
      command_params = cmd.split(' ');
      command = command_params.first();
      command_params.removeFirst();
    }
    setting.endGroup();
    if (!command.isEmpty()) break;
  }

  if (command_params.contains("%u")) {
    command_params.removeAt(command_params.indexOf("%u"));
  }
  if (command_params.contains("%U")) {
    command_params.removeAt(command_params.indexOf("%U"));
  }

  if (command.startsWith("/usr/bin/")) {
    command = command.split("/").last();
  }

  if (command.isEmpty() || command == "exo-open") {
    QFileInfo info(path);
    if (!info.exists()) return;
    QString directory = info.dir().path();
    if (directory.isEmpty()) return;
    QDesktopServices::openUrl(QUrl::fromLocalFile(directory));
  }
  else if (command.startsWith("nautilus")) {
    proc.startDetached(command, QStringList() << command_params << "--select" << path);
  }
  else if (command.startsWith("dolphin") || command.startsWith("konqueror") || command.startsWith("kfmclient")) {
    proc.startDetached(command, QStringList() << command_params << "--select" << "--new-window" << path);
  }
  else if (command.startsWith("caja")) {
    QFileInfo info(path);
    if (!info.exists()) return;
    QString directory = info.dir().path();
    proc.startDetached(command, QStringList() << command_params << "--no-desktop" << directory);
  }
  else {
    proc.startDetached(command, QStringList() << command_params << path);
  }

}
#endif

#ifdef Q_OS_MACOS
// Better than openUrl(dirname(path)) - also highlights file at path
void RevealFileInFinder(QString const &path) {
  QProcess::execute("/usr/bin/open", QStringList() << "-R" << path);
}
#endif  // Q_OS_MACOS

#ifdef Q_OS_WIN
void ShowFileInExplorer(QString const &path);
void ShowFileInExplorer(QString const &path) {
  QProcess::execute("explorer.exe", QStringList() << "/select," << QDir::toNativeSeparators(path));
}
#endif

void OpenInFileBrowser(const QList<QUrl> &urls) {

  if (urls.count() > 50) {
    QMessageBox messagebox(QMessageBox::Critical, tr("Show in file browser"), tr("Too many songs selected."));
    messagebox.exec();
    return;
  }

  if (urls.count() > 5) {
    QMessageBox messagebox(QMessageBox::Information, tr("Show in file browser"), tr("%1 songs selected, are you sure you want to open them all?").arg(urls.count()), QMessageBox::Open|QMessageBox::Cancel);
    messagebox.setTextFormat(Qt::RichText);
    int result = messagebox.exec();
    switch (result) {
    case QMessageBox::Open:
      break;
    case QMessageBox::Cancel:
    default:
      return;
    }
  }

  QSet<QString> dirs;

  for (const QUrl &url : urls) {
    if (!url.isLocalFile()) {
      continue;
    }
    QString path = url.toLocalFile();

    if (!QFile::exists(path)) continue;

    const QString directory = QFileInfo(path).dir().path();
    if (dirs.contains(directory)) continue;
    dirs.insert(directory);

#if defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)
    OpenInFileManager(path);
#elif defined(Q_OS_MACOS)
    // Revealing multiple files in the finder only opens one window, so it also makes sense to reveal at most one per directory
    RevealFileInFinder(path);
#elif defined(Q_OS_WIN32)
    ShowFileInExplorer(path);
#endif
  }

}

QByteArray Hmac(const QByteArray &key, const QByteArray &data, const HashFunction method) {

  const int kBlockSize = 64;  // bytes
  Q_ASSERT(key.length() <= kBlockSize);

  QByteArray inner_padding(kBlockSize, char(0x36));
  QByteArray outer_padding(kBlockSize, char(0x5c));

  for (int i = 0; i < key.length(); ++i) {
    inner_padding[i] = inner_padding[i] ^ key[i];
    outer_padding[i] = outer_padding[i] ^ key[i];
  }
  if (Md5_Algo == method) {
    return QCryptographicHash::hash(outer_padding + QCryptographicHash::hash(inner_padding + data, QCryptographicHash::Md5), QCryptographicHash::Md5);
  }
  else if (Sha1_Algo == method) {
    return QCryptographicHash::hash(outer_padding + QCryptographicHash::hash(inner_padding + data, QCryptographicHash::Sha1), QCryptographicHash::Sha1);
  }
  else {  // Sha256_Algo, currently default
    return QCryptographicHash::hash(outer_padding + QCryptographicHash::hash(inner_padding + data, QCryptographicHash::Sha256), QCryptographicHash::Sha256);
  }

}

QByteArray HmacSha256(const QByteArray &key, const QByteArray &data) {
  return Hmac(key, data, Sha256_Algo);
}

QByteArray HmacMd5(const QByteArray &key, const QByteArray &data) {
  return Hmac(key, data, Md5_Algo);
}

QByteArray HmacSha1(const QByteArray &key, const QByteArray &data) {
  return Hmac(key, data, Sha1_Algo);
}

// File must not be open and will be closed afterwards!
QByteArray Sha1File(QFile &file) {

  file.open(QIODevice::ReadOnly);
  QCryptographicHash hash(QCryptographicHash::Sha1);
  QByteArray data;

  while (!file.atEnd()) {
    data = file.read(1000000);  // 1 mib
    hash.addData(data.data(), data.length());
    data.clear();
  }

  file.close();

  return hash.result();

}

QByteArray Sha1CoverHash(const QString &artist, const QString &album) {

  QCryptographicHash hash(QCryptographicHash::Sha1);
  hash.addData(artist.toLower().toUtf8().constData());
  hash.addData(album.toLower().toUtf8().constData());

  return hash.result();

}

QString PrettySize(const QSize &size) {
  return QString::number(size.width()) + "x" + QString::number(size.height());
}

void ForwardMouseEvent(const QMouseEvent *e, QWidget *target) {
  QMouseEvent c(e->type(), target->mapFromGlobal(e->globalPos()), e->globalPos(), e->button(), e->buttons(), e->modifiers());

  QApplication::sendEvent(target, &c);
}

bool IsMouseEventInWidget(const QMouseEvent *e, const QWidget *widget) {
  return widget->rect().contains(widget->mapFromGlobal(e->globalPos()));
}

quint16 PickUnusedPort() {

  forever {
#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
    const quint64 port = QRandomGenerator::global()->bounded(49152, 65535);
#else
    const quint16 port = 49152 + qrand() % 16384;
#endif

    QTcpServer server;
    if (server.listen(QHostAddress::Any, port)) {
      return port;
    }
  }

}

void ConsumeCurrentElement(QXmlStreamReader *reader) {

  int level = 1;
  while (level != 0 && !reader->atEnd()) {
    switch (reader->readNext()) {
      case QXmlStreamReader::StartElement: ++level; break;
      case QXmlStreamReader::EndElement:   --level; break;
      default: break;
    }
  }

}

bool ParseUntilElement(QXmlStreamReader *reader, const QString &name) {

  while (!reader->atEnd()) {
    QXmlStreamReader::TokenType type = reader->readNext();
    switch (type) {
      case QXmlStreamReader::StartElement:
        if (reader->name() == name) {
          return true;
        }
        break;
      default:
        break;
    }
  }
  return false;

}

bool ParseUntilElementCI(QXmlStreamReader *reader, const QString &name) {

  while (!reader->atEnd()) {
    QXmlStreamReader::TokenType type = reader->readNext();
    switch (type) {
      case QXmlStreamReader::StartElement:{
        QString element = reader->name().toString().toLower();
        if (element == name) {
          return true;
        }
        break;
      }
      default:
        break;
    }
  }
  return false;

}

QDateTime ParseRFC822DateTime(const QString &text) {

  QRegExp regexp("(\\d{1,2}) (\\w{3,12}) (\\d+) (\\d{1,2}):(\\d{1,2}):(\\d{1,2})");
  if (regexp.indexIn(text) == -1) {
    return QDateTime();
  }

  enum class MatchNames { DAYS = 1, MONTHS, YEARS, HOURS, MINUTES, SECONDS };

  QMap<QString, int> monthmap;
  monthmap["Jan"] = 1;
  monthmap["Feb"] = 2;
  monthmap["Mar"] = 3;
  monthmap["Apr"] = 4;
  monthmap["May"] = 5;
  monthmap["Jun"] = 6;
  monthmap["Jul"] = 7;
  monthmap["Aug"] = 8;
  monthmap["Sep"] = 9;
  monthmap["Oct"] = 10;
  monthmap["Nov"] = 11;
  monthmap["Dec"] = 12;
  monthmap["January"] = 1;
  monthmap["February"] = 2;
  monthmap["March"] = 3;
  monthmap["April"] = 4;
  monthmap["May"] = 5;
  monthmap["June"] = 6;
  monthmap["July"] = 7;
  monthmap["August"] = 8;
  monthmap["September"] = 9;
  monthmap["October"] = 10;
  monthmap["November"] = 11;
  monthmap["December"] = 12;

  const QDate date(regexp.cap(static_cast<int>(MatchNames::YEARS)).toInt(), monthmap[regexp.cap(static_cast<int>(MatchNames::MONTHS))], regexp.cap(static_cast<int>(MatchNames::DAYS)).toInt());

  const QTime time(regexp.cap(static_cast<int>(MatchNames::HOURS)).toInt(), regexp.cap(static_cast<int>(MatchNames::MINUTES)).toInt(), regexp.cap(static_cast<int>(MatchNames::SECONDS)).toInt());

  return QDateTime(date, time);

}

const char *EnumToString(const QMetaObject &meta, const char *name, int value) {

  int index = meta.indexOfEnumerator(name);
  if (index == -1) return "[UnknownEnum]";
  QMetaEnum metaenum = meta.enumerator(index);
  const char *result = metaenum.valueToKey(value);
  if (!result) return "[UnknownEnumValue]";
  return result;

}

QStringList Prepend(const QString &text, const QStringList &list) {

  QStringList ret(list);
  for (int i = 0; i < ret.count(); ++i) ret[i].prepend(text);
  return ret;

}

QStringList Updateify(const QStringList &list) {

  QStringList ret(list);
  for (int i = 0; i < ret.count(); ++i) ret[i].prepend(ret[i] + " = :");
  return ret;

}

QString DecodeHtmlEntities(const QString &text) {

  QString copy(text);
  copy.replace("&amp;", "&");
  copy.replace("&quot;", "\"");
  copy.replace("&apos;", "'");
  copy.replace("&lt;", "<");
  copy.replace("&gt;", ">");
  return copy;

}

int SetThreadIOPriority(IoPriority priority) {

#ifdef Q_OS_LINUX
  return syscall(SYS_ioprio_set, IOPRIO_WHO_PROCESS, GetThreadId(), 4 | priority << IOPRIO_CLASS_SHIFT);
#elif defined(Q_OS_MACOS)
  return setpriority(PRIO_DARWIN_THREAD, 0, priority == IOPRIO_CLASS_IDLE ? PRIO_DARWIN_BG : 0);
#else
  Q_UNUSED(priority);
  return 0;
#endif

}

int GetThreadId() {

#ifdef Q_OS_LINUX
  return syscall(SYS_gettid);
#else
  return 0;
#endif

}

bool IsLaptop() {

#ifdef Q_OS_WIN
  SYSTEM_POWER_STATUS status;
  if (!GetSystemPowerStatus(&status)) {
    return false;
  }

  return !(status.BatteryFlag & 128);  // 128 = no system battery
#elif defined(Q_OS_LINUX)
  return !QDir("/proc/acpi/battery").entryList(QDir::Dirs | QDir::NoDotAndDotDot).isEmpty();
#elif defined(Q_OS_MACOS)
  ScopedCFTypeRef<CFTypeRef> power_sources(IOPSCopyPowerSourcesInfo());
  ScopedCFTypeRef<CFArrayRef> power_source_list(IOPSCopyPowerSourcesList(power_sources.get()));
  for (CFIndex i = 0; i < CFArrayGetCount(power_source_list.get()); ++i) {
    CFTypeRef ps = CFArrayGetValueAtIndex(power_source_list.get(), i);
    CFDictionaryRef description = IOPSGetPowerSourceDescription(power_sources.get(), ps);

    if (CFDictionaryContainsKey(description, CFSTR(kIOPSBatteryHealthKey))) {
      return true;
    }
  }
  return false;
#else
  return false;
#endif

}

bool UrlOnSameDriveAsStrawberry(const QUrl &url) {

  if (!url.isValid() || !url.isLocalFile() || url.toLocalFile().isEmpty()) return false;

#ifdef Q_OS_WIN
  QUrl appUrl = QUrl::fromLocalFile(QCoreApplication::applicationDirPath());
  if (url.toLocalFile().left(1) == appUrl.toLocalFile().left(1))
    return true;
  else
    return false;
#else
  // Non windows systems have always a / in the path
  return true;
#endif

}

QUrl GetRelativePathToStrawberryBin(const QUrl &url) {
  if (!url.isValid()) return QUrl();
  QDir appPath(QCoreApplication::applicationDirPath());
  return QUrl::fromLocalFile(appPath.relativeFilePath(url.toLocalFile()));
}

QString PathWithoutFilenameExtension(const QString &filename) {
  if (filename.section('/', -1, -1).contains('.')) return filename.section('.', 0, -2);
  return filename;
}

QString FiddleFileExtension(const QString &filename, const QString &new_extension) {
  return PathWithoutFilenameExtension(filename) + "." + new_extension;
}

QString GetEnv(const QString &key) {
  return QString::fromLocal8Bit(qgetenv(key.toLocal8Bit()));
}

void SetEnv(const char *key, const QString &value) {

#ifdef Q_OS_WIN32
  putenv(QString("%1=%2").arg(key, value).toLocal8Bit().constData());
#else
  setenv(key, value.toLocal8Bit().constData(), 1);
#endif

}

void IncreaseFDLimit() {

#ifdef Q_OS_MACOS
  // Bump the soft limit for the number of file descriptors from the default of 256 to the maximum (usually 10240).
  struct rlimit limit;
  getrlimit(RLIMIT_NOFILE, &limit);

  // getrlimit() lies about the hard limit so we have to check sysctl.
  int max_fd = 0;
  size_t len = sizeof(max_fd);
  sysctlbyname("kern.maxfilesperproc", &max_fd, &len, nullptr, 0);

  limit.rlim_cur = max_fd;
  int ret = setrlimit(RLIMIT_NOFILE, &limit);

  if (ret == 0) {
    qLog(Debug) << "Max fd:" << max_fd;
  }
#endif

}

QString GetRandomStringWithChars(const int len) {
  const QString UseCharacters("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
  return GetRandomString(len, UseCharacters);
}

QString GetRandomStringWithCharsAndNumbers(const int len) {
  const QString UseCharacters("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
  return GetRandomString(len, UseCharacters);
}

QString CryptographicRandomString(const int len) {
  const QString UseCharacters("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~");
  return GetRandomString(len, UseCharacters);
}

QString GetRandomString(const int len, const QString &UseCharacters) {

   QString randstr;
   for(int i = 0 ; i < len ; ++i) {
#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
     const int index = QRandomGenerator::global()->bounded(0, UseCharacters.length());
#else
     const int index = qrand() % UseCharacters.length();
#endif
     QChar nextchar = UseCharacters.at(index);
     randstr.append(nextchar);
   }
   return randstr;

}

QString DesktopEnvironment() {

  const QString de = GetEnv("XDG_CURRENT_DESKTOP");
  if (!de.isEmpty()) return de;

  if (!qEnvironmentVariableIsEmpty("KDE_FULL_SESSION"))         return "KDE";
  if (!qEnvironmentVariableIsEmpty("GNOME_DESKTOP_SESSION_ID")) return "Gnome";

  QString session = GetEnv("DESKTOP_SESSION");
  int slash = session.lastIndexOf('/');
  if (slash != -1) {
    QSettings desktop_file(QString(session + ".desktop"), QSettings::IniFormat);
    desktop_file.beginGroup("Desktop Entry");
    QString name = desktop_file.value("DesktopNames").toString();
    desktop_file.endGroup();
    if (!name.isEmpty()) return name;
    session = session.mid(slash + 1);
  }

  if (session == "kde")           return "KDE";
  else if (session == "gnome")    return "Gnome";
  else if (session == "xfce")     return "XFCE";

  return "Unknown";

}

QString UnicodeToAscii(const QString &unicode) {

#ifdef LC_ALL
  setlocale(LC_ALL, "");
#endif

  iconv_t conv = iconv_open("ASCII//TRANSLIT", "UTF-8");
  if (conv == (iconv_t) -1) return unicode;

  QByteArray utf8 = unicode.toUtf8();

  size_t input_len = utf8.length() + 1;
  char *input_ptr = new char[input_len];
  char *input = input_ptr;

  size_t output_len = input_len * 2;
  char *output_ptr = new char[output_len];
  char *output = output_ptr;

  snprintf(input, input_len, "%s", utf8.constData());

  iconv(conv, &input, &input_len, &output, &output_len);
  iconv_close(conv);

  QString ret(output_ptr);

  delete[] input_ptr;
  delete[] output_ptr;

  return ret;

}

QString MacAddress() {

  QString ret;

  for (QNetworkInterface &netif : QNetworkInterface::allInterfaces()) {
    if (
        (netif.hardwareAddress() == "00:00:00:00:00:00") ||
        (netif.flags() & QNetworkInterface::IsLoopBack) ||
        !(netif.flags() & QNetworkInterface::IsUp) ||
        !(netif.flags() & QNetworkInterface::IsRunning)
        ) { continue; }
    if (ret.isEmpty()
#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
        || netif.type() == QNetworkInterface::Ethernet || netif.type() == QNetworkInterface::Wifi
#endif
    ) {
      ret = netif.hardwareAddress();
    }
  }

  if (ret.isEmpty()) ret = "00:00:00:00:00:00";

  return ret;

}

QString ReplaceMessage(const QString &message, const Song &song, const QString &newline) {

  QRegExp variable_replacer("[%][a-z]+[%]");
  QString copy(message);

  // Replace the first line
  int pos = 0;
  variable_replacer.indexIn(message);
  while ((pos = variable_replacer.indexIn(message, pos)) != -1) {
    QStringList captured = variable_replacer.capturedTexts();
    copy.replace(captured[0], ReplaceVariable(captured[0], song, newline));
    pos += variable_replacer.matchedLength();
  }

  int index_of = copy.indexOf(QRegExp(" - (>|$)"));
  if (index_of >= 0) copy = copy.remove(index_of, 3);

  return copy;
}

QString ReplaceVariable(const QString &variable, const Song &song, const QString &newline) {

  QString return_value;
  if (variable == "%artist%") {
    return song.artist().toHtmlEscaped();
  }
  else if (variable == "%album%") {
    return song.album().toHtmlEscaped();
  }
  else if (variable == "%title%") {
    return song.PrettyTitle().toHtmlEscaped();
  }
  else if (variable == "%albumartist%") {
    return song.effective_albumartist().toHtmlEscaped();
  }
  else if (variable == "%year%") {
    return song.PrettyYear().toHtmlEscaped();
  }
  else if (variable == "%composer%") {
    return song.composer().toHtmlEscaped();
  }
  else if (variable == "%performer%") {
    return song.performer().toHtmlEscaped();
  }
  else if (variable == "%grouping%") {
    return song.grouping().toHtmlEscaped();
  }
  else if (variable == "%length%") {
    return song.PrettyLength().toHtmlEscaped();
  }
  else if (variable == "%disc%") {
    return return_value.setNum(song.disc()).toHtmlEscaped();
  }
  else if (variable == "%track%") {
    return return_value.setNum(song.track()).toHtmlEscaped();
  }
  else if (variable == "%genre%") {
    return song.genre().toHtmlEscaped();
  }
  else if (variable == "%playcount%") {
    return return_value.setNum(song.playcount()).toHtmlEscaped();
  }
  else if (variable == "%skipcount%") {
    return return_value.setNum(song.skipcount()).toHtmlEscaped();
  }
  else if (variable == "%filename%") {
    return song.basefilename().toHtmlEscaped();
  }
  else if (variable == "%newline%") {
    return QString(newline);
  }

  //if the variable is not recognized, just return it
  return variable;
}

bool IsColorDark(const QColor &color) {
  return ((30 * color.red() + 59 * color.green() + 11 * color.blue()) / 100) <= 130;
}

QList<QByteArray> ImageFormatsForMimeType(const QByteArray &mimetype) {

  if (mimetype == "image/bmp") return QList<QByteArray>() << "BMP";
  else if (mimetype == "image/gif") return QList<QByteArray>() << "GIF";
  else if (mimetype == "image/jpeg") return QList<QByteArray>() << "JPG";
  else if (mimetype == "image/png") return QList<QByteArray>() << "PNG";
  else return QList<QByteArray>();

}

}  // namespace Utilities

ScopedWCharArray::ScopedWCharArray(const QString &str)
    : chars_(str.length()), data_(new wchar_t[chars_ + 1]) {
  str.toWCharArray(data_.get());
  data_[chars_] = '\0';
}