[systemsettings] Add TimeZoneInfo. Contributes to JB#39801

src/src.pro

@@ -31,7 +31,8 @@ SOURCES += \
     partition.cpp \
     partitionmanager.cpp \
     partitionmodel.cpp \
-    locationsettings.cpp
+    locationsettings.cpp \
+    timezoneinfo.cpp
 
 PUBLIC_HEADERS = \
     languagemodel.h \
@@ -52,7 +53,8 @@ PUBLIC_HEADERS = \
     partitionmanager.h \
     partitionmodel.h \
     systemsettingsglobal.h \
-    locationsettings.h
+    locationsettings.h \
+    timezoneinfo.h
 
 HEADERS += \
     $$PUBLIC_HEADERS \

src/timezoneinfo.cpp

@@ -0,0 +1,352 @@
+/*
+ * Copyright (C) 2017 Jolla Ltd. <martin.jones@jollamobile.com>
+ *
+ * You may use this file under the terms of the BSD license as follows:
+ *
+ * "Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Nemo Mobile nor the names of its contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+ */
+
+#include "timezoneinfo.h"
+
+#include <sys/time.h>
+
+#include <QDebug>
+#include <QFile>
+#include <QDataStream>
+
+namespace {
+
+static const QString ZoneInfoPath = QStringLiteral("/usr/share/zoneinfo/");
+
+static QByteArray scanWord(const char *&ch)
+{
+    const char *start = ch;
+    while (*ch && !isspace(*ch))
+        ++ch;
+
+    return QByteArray(start, ch-start);
+}
+
+static QByteArray scanToEnd(const char *&ch)
+{
+    const char *start = ch;
+    while (*ch && *ch != '\n')
+        ++ch;
+
+    return QByteArray(start, ch-start);
+}
+
+static void skipSpace(const char *&ch)
+{
+    while (*ch && isspace(*ch))
+        ++ch;
+}
+
+static QHash<QByteArray,QByteArray> parseIso3166()
+{
+    QHash<QByteArray,QByteArray> countries;
+    QFile file(ZoneInfoPath + QStringLiteral("iso3166.tab"));
+
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning() << "Cannot open timezone file:" << file.fileName();
+        return countries;
+    }
+
+    while (!file.atEnd()) {
+        QByteArray line = file.readLine();
+        if (line.length() == 0)
+            break;
+        if (line[0] == '#')
+            continue;
+
+        const char *ch = line.data();
+        QByteArray code = scanWord(ch);
+        if (!code.isEmpty()) {
+            skipSpace(ch);
+            countries.insert(code, scanToEnd(ch));
+        }
+    }
+
+    return countries;
+}
+
+}
+
+class TimeZoneInfoPrivate
+{
+public:
+    TimeZoneInfoPrivate();
+    ~TimeZoneInfoPrivate();
+
+    static QList<TimeZoneInfo> parseZoneTab();
+    static void parseZoneTabLine(const QByteArray &line, TimeZoneInfo *tzInfo);
+    static void parseZoneInfo(TimeZoneInfo *tzInfo);
+
+    QByteArray name;
+    QByteArray area;
+    QByteArray city;
+    QByteArray countryCode;
+    QByteArray countryName;
+    QByteArray comments;
+    qint32 offset;
+    bool valid;
+};
+
+TimeZoneInfoPrivate::TimeZoneInfoPrivate()
+    : offset(0)
+    , valid(false)
+{
+}
+
+TimeZoneInfoPrivate::~TimeZoneInfoPrivate()
+{
+}
+
+QList<TimeZoneInfo> TimeZoneInfoPrivate::parseZoneTab()
+{
+    QList<TimeZoneInfo> timeZones;
+    QHash<QByteArray,QByteArray> countries = parseIso3166();
+
+    QFile file(ZoneInfoPath + QStringLiteral("zone.tab"));
+
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning() << "Cannot open timezone file:" << file.fileName();
+        return timeZones;
+    }
+
+    while (!file.atEnd()) {
+        QByteArray line = file.readLine();
+        if (line.length() == 0)
+            break;
+        if (line[0] == '#')
+            continue;
+
+        TimeZoneInfo tz;
+        parseZoneTabLine(line, &tz);
+        parseZoneInfo(&tz);
+        if (tz.isValid()) {
+            tz.d->countryName = countries.value(tz.d->countryCode);
+            timeZones.append(tz);
+        }
+    }
+
+    return timeZones;
+}
+
+void TimeZoneInfoPrivate::parseZoneTabLine(const QByteArray &line, TimeZoneInfo *tzInfo)
+{
+    if (!tzInfo) {
+        return;
+    }
+    int column = 0;
+    const char *ch = line.data();
+    while (*ch && *ch != '\n') {
+        switch (column) {
+        case 0:
+            tzInfo->d->countryCode = scanWord(ch);
+            skipSpace(ch);
+            break;
+        case 1:
+            // location
+            scanWord(ch);
+            skipSpace(ch);
+            break;
+        case 2:
+            tzInfo->d->name = scanWord(ch);
+            skipSpace(ch);
+            break;
+        case 3:
+            tzInfo->d->comments = scanToEnd(ch);
+            break;
+        }
+        ++column;
+    }
+    tzInfo->d->valid = column > 2;
+
+    if (tzInfo->d->valid) {
+        int slash = tzInfo->d->name.lastIndexOf('/');
+        if (slash > 0) {
+            tzInfo->d->area = tzInfo->d->name.left(slash);
+            tzInfo->d->city = tzInfo->d->name.mid(slash+1);
+        }
+    }
+}
+
+void TimeZoneInfoPrivate::parseZoneInfo(TimeZoneInfo *tzInfo)
+{
+    if (!tzInfo) {
+        return;
+    }
+
+    QFile file(ZoneInfoPath + tzInfo->d->name);
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning() << "Cannot open timezone file:" << file.fileName();
+        tzInfo->d->valid = false;
+        return;
+    }
+
+    QByteArray data = file.readAll();
+    if (data.count() < 46 || !data.startsWith("TZif")) {
+        qWarning() << "Invalid timezone file:" << file.fileName();
+        tzInfo->d->valid = false;
+        return;
+    }
+
+    QDataStream ds(data);
+    ds.skipRawData(20); // 'TZif' plus version char plus 15 unused chars
+
+    // read header
+    qint32 tzh_ttisgmtcnt, tzh_ttisstdcnt, tzh_leapcnt, tzh_timecnt, tzh_typecnt, tzh_charcnt;
+    ds >> tzh_ttisgmtcnt >> tzh_ttisstdcnt >> tzh_leapcnt >> tzh_timecnt >> tzh_typecnt >> tzh_charcnt;
+
+    // followed by tzh_timecnt four-byte values of type long
+    qint32 tmp32;
+    for (int i = 0; i < tzh_timecnt; ++i)
+        ds >> tmp32;
+
+    uchar tmp8 = 0;
+    QVarLengthArray<int, 128> transitionIndexes(tzh_timecnt);
+    // Next come  tzh_timecnt  one-byte  values of type unsigned  char
+    for (int i = 0; i < tzh_timecnt; ++i) {
+        ds >> tmp8;
+        transitionIndexes[i] = tmp8;
+    }
+
+    // then we have tzh_typecnt ttinfo structures
+    QVector<QPair<qint32,int> > types(tzh_typecnt);
+    for (int i = 0; i < tzh_typecnt; ++i) {
+        ds >> tmp32; // tt_gmtoff
+        ds >> tmp8;  // tt_isdst
+        types[i].first = tmp32;
+        types[i].second = tmp8;
+        ds >> tmp8;  // tt_abbrind
+    }
+
+    if (tzh_typecnt)
+        tzInfo->d->offset = types[0].first;
+
+    if (tzh_timecnt) {
+        // find the last non-dst transition
+        int i = tzh_timecnt - 1;
+        while (i >= 0 && types[transitionIndexes[i]].second) {
+            --i;
+        }
+        if (i >= 0)
+            tzInfo->d->offset = types[transitionIndexes[i]].first;
+    }
+
+    // ignore the rest for now
+}
+
+
+TimeZoneInfo::TimeZoneInfo()
+    : d(new TimeZoneInfoPrivate)
+{
+}
+
+TimeZoneInfo::~TimeZoneInfo()
+{
+    delete d;
+}
+
+TimeZoneInfo::TimeZoneInfo(const TimeZoneInfo &other)
+    : d(new TimeZoneInfoPrivate)
+{
+    operator=(other);
+}
+
+bool TimeZoneInfo::isValid() const
+{
+    return d->valid;
+}
+
+QByteArray TimeZoneInfo::countryCode() const
+{
+    return d->countryCode;
+}
+
+QByteArray TimeZoneInfo::countryName() const
+{
+    return d->countryName;
+}
+
+QByteArray TimeZoneInfo::name() const
+{
+    return d->name;
+}
+
+QByteArray TimeZoneInfo::area() const
+{
+    return d->area;
+}
+
+QByteArray TimeZoneInfo::city() const
+{
+    return d->city;
+}
+
+QByteArray TimeZoneInfo::comments() const
+{
+    return d->comments;
+}
+
+qint32 TimeZoneInfo::offset() const
+{
+    return d->offset;
+}
+
+TimeZoneInfo &TimeZoneInfo::operator=(const TimeZoneInfo &other)
+{
+    if (this == &other) {
+        return *this;
+    }
+
+    d->name = other.d->name;
+    d->area = other.d->area;
+    d->city = other.d->city;
+    d->countryCode = other.d->countryCode;
+    d->countryName = other.d->countryName;
+    d->comments = other.d->comments;
+    d->offset = other.d->offset;
+    d->valid = other.d->valid;
+
+    return *this;
+}
+
+bool TimeZoneInfo::operator==(const TimeZoneInfo &other) const
+{
+    return d->name == other.d->name;
+}
+
+bool TimeZoneInfo::operator!=(const TimeZoneInfo &other) const
+{
+    return d->name != other.d->name;
+}
+
+QList<TimeZoneInfo> TimeZoneInfo::systemTimeZones()
+{
+    return TimeZoneInfoPrivate::parseZoneTab();
+}