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Bring Windows XP themes to your KDE Plasma environment!
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172// SPDX-License-Identifier: GPL-3.0-or-later#include "app/timezones.h"
#include "app/inf.h"#include "app/media.h"#include "core/dib.h"#include "core/pe.h"
#include <QDateTime>#include <QHash>#include <QTimeZone>#include <QtEndian>
#include <algorithm>
namespace xpl::timezones {
QList<Zone> parse(const QByteArray &hivesft){ // HKLM,"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\<key>","Display",0x00000002,"%GMT_MINUS_06_A_DESC%" static const QString root = QStringLiteral("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\"); const Inf inf = Inf::parse(hivesft); QHash<QString, Zone> zones; for (const QString §ion : inf.sectionNames()) for (const QString &line : inf.lines(section)) { if (!line.contains(QLatin1String("Time Zones\\"))) continue; const QStringList f = inf.fields(line); if (f.size() < 5 || f.at(0).compare(QLatin1String("HKLM"), Qt::CaseInsensitive) != 0 || !f.at(1).startsWith(root, Qt::CaseInsensitive)) continue; const QString key = f.at(1).mid(root.size()); if (key.isEmpty() || key.contains(QLatin1Char('\\'))) continue; Zone &z = zones[key]; z.key = key; const QString name = f.at(2), value = f.at(4); if (name == QLatin1String("Display")) z.display = value; else if (name == QLatin1String("Std")) z.standard = value; else if (name == QLatin1String("Dlt")) z.daylight = value; else if (name == QLatin1String("Index")) z.index = value.toInt(nullptr, 0); else if (name == QLatin1String("MapID")) { const QStringList ids = value.split(QLatin1Char(',')); // "36,37": sea, land z.mapSea = ids.value(0, QStringLiteral("-1")).trimmed().toInt(); z.mapLand = ids.value(1, QStringLiteral("-1")).trimmed().toInt(); } } QList<Zone> out; for (Zone z : std::as_const(zones)) { if (z.display.isEmpty()) continue; z.iana = QTimeZone::windowsIdToDefaultIanaId(z.key.toUtf8()); // XP's names Windows has since retired. if (z.iana.isEmpty()) { static const QHash<QString, QByteArray> retired{ {QStringLiteral("Mexico Standard Time"), "America/Mexico_City"}, {QStringLiteral("Mexico Standard Time 2"), "America/Mazatlan"}, {QStringLiteral("Mid-Atlantic Standard Time"), "Atlantic/South_Georgia"}, }; z.iana = retired.value(z.key); } out.append(z); } // XP's order: by offset from GMT, then by name -- its Index. std::sort(out.begin(), out.end(), [](const Zone &a, const Zone &b) { return a.index != b.index ? a.index < b.index : a.display < b.display; }); return out;}
std::optional<QList<Zone>> load(QString *error){ const auto bytes = media::systemFile(QStringLiteral("hivesft.inf"), error); if (!bytes) return std::nullopt; QList<Zone> zones = parse(*bytes); if (zones.isEmpty()) { if (error) *error = QStringLiteral("HIVESFT.INF lists no time zones"); return std::nullopt; } return zones;}
int find(const QList<Zone> &zones, const QByteArray &iana){ // The Windows zone the Linux one belongs to, then XP's zone of that name; // failing that, one that stands for the same Linux zone. const QByteArray windows = QTimeZone::ianaIdToWindowsId(iana); for (int i = 0; i < zones.size(); ++i) if (!windows.isEmpty() && zones.at(i).key.toUtf8() == windows) return i; for (int i = 0; i < zones.size(); ++i) if (zones.at(i).iana == iana) return i; // An alias ("US/Central") or a zone XP's list doesn't name: the one that // keeps the same time all year -- the same offsets, switched on the same // days. const QTimeZone wanted(iana); if (!wanted.isValid()) return -1; const QDate year(QDate::currentDate().year(), 1, 1); for (int i = 0; i < zones.size(); ++i) { if (zones.at(i).iana.isEmpty()) continue; const QTimeZone candidate(zones.at(i).iana); if (!candidate.isValid()) continue; bool same = true; for (int day = 0; day < 366 && same; day += 3) { const QDateTime at(year.addDays(day).startOfDay(QTimeZone::UTC)); same = wanted.offsetFromUtc(at) == candidate.offsetFromUtc(at); } if (same) return i; } return -1;}
std::optional<Map> map(QString *error){ const auto bytes = media::systemFile(QStringLiteral("timedate.cpl"), error); if (!bytes) return std::nullopt; const auto pe = PeResources::parse(*bytes, error); if (!pe) return std::nullopt; const Resource *r = pe->find(u"2", u"50"); if (!r || r->data.size() < 40) { if (error) *error = QStringLiteral("timedate.cpl has no world map"); return std::nullopt; } // The bitmap's colours only tell its palette indices apart: every one is // distinct, so each decoded pixel is looked up by colour. const auto *p = reinterpret_cast<const uchar *>(r->data.constData()); const quint32 header = qFromLittleEndian<quint32>(p); const quint16 bpp = qFromLittleEndian<quint16>(p + 14); quint32 colours = qFromLittleEndian<quint32>(p + 32); if (!colours && bpp <= 8) colours = 1u << bpp; if (bpp != 8 || header + colours * 4 > quint32(r->data.size())) { if (error) *error = QStringLiteral("timedate.cpl's world map isn't the 256-colour bitmap XP's is"); return std::nullopt; } QHash<QRgb, int> index; for (quint32 i = 0; i < colours; ++i) { const uchar *c = p + header + i * 4; if (const QRgb rgb = qRgb(c[2], c[1], c[0]); !index.contains(rgb)) index.insert(rgb, int(i)); // (the palette's unused tail repeats colours: the first wins) } const QImage decoded = decodeDib(r->data).image; if (decoded.isNull()) { if (error) *error = QStringLiteral("timedate.cpl's world map doesn't decode"); return std::nullopt; } Map m; m.indices = QImage(decoded.size(), QImage::Format_Grayscale8); for (int y = 0; y < decoded.height(); ++y) { uchar *line = m.indices.scanLine(y); for (int x = 0; x < decoded.width(); ++x) line[x] = uchar(index.value(decoded.pixel(x, y) | 0xff000000u, 0)); } return m;}
} // namespace xpl::timezones