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#include <QtTest/QtTest>

#include <qtextcodec.h>

#include <qsharedpointer.h>

//TESTED_CLASS=

//TESTED_FILES=

static const char utf8bom[] = "\xEF\xBB\xBF";

class tst_Utf8 : public QObject

{

    Q_OBJECT

public:

    // test data:

    QTextCodec *codec;

    QString (*from8BitPtr)(const char *, int);

    QByteArray (QString:: *to8Bit)() const;

    inline QString from8Bit(const QByteArray &ba)

    { return from8BitPtr(ba.constData(), ba.length()); }

public slots:

    void initTestCase();

    void init();

private slots:

    void roundTrip_data();

    void roundTrip();

    void charByChar_data();

    void charByChar();

    void invalidUtf8_data();

    void invalidUtf8();

};

void tst_Utf8::initTestCase()

{

    QTest::addColumn<bool>("useLocale");

    QTest::newRow("utf8codec") << false;

    // is the locale UTF-8?

    if (QString(QChar(QChar::ReplacementCharacter)).toLocal8Bit() == "\xEF\xBF\xBD") {

        QTest::newRow("localecodec") << true;

        qDebug() << "locale is utf8";

    }

}

void tst_Utf8::init()

{

    QFETCH_GLOBAL(bool, useLocale);

    if (useLocale) {

        codec = QTextCodec::codecForLocale();

        from8BitPtr = &QString::fromLocal8Bit;

        to8Bit = &QString::toLocal8Bit;

    } else {

        codec = QTextCodec::codecForMib(106);

        from8BitPtr = &QString::fromUtf8;

        to8Bit = &QString::toUtf8;

    }

}

void tst_Utf8::roundTrip_data()

{

    QTest::addColumn<QByteArray>("utf8");

    QTest::addColumn<QString>("utf16");

    QTest::newRow("empty") << QByteArray() << QString();

    QTest::newRow("nul") << QByteArray("", 1) << QString(QChar(QChar::Null));

    static const char ascii[] = "This is a standard US-ASCII message";

    QTest::newRow("ascii") << QByteArray(ascii) << ascii;

    static const char ascii2[] = "\1This\2is\3an\4US-ASCII\020 message interspersed with control chars";

    QTest::newRow("ascii2") << QByteArray(ascii2) << ascii2;

    static const char utf8_1[] = "\302\240"; // NBSP

    QTest::newRow("utf8_1") << QByteArray(utf8_1) << QString(QChar(QChar::Nbsp));

    static const char utf8_2[] = "\342\202\254"; // Euro symbol

    QTest::newRow("utf8_2") << QByteArray(utf8_2) << QString(QChar(0x20AC));

#if 0

    // Can't test this because QString::fromUtf8 consumes it

    static const char utf8_3[] = "\357\273\277"; // byte order mark

    QTest::newRow("utf8_3") << QByteArray(utf8_3) << QString(QChar(QChar::ByteOrderMark));

#endif

    static const char utf8_4[] = "\357\277\275"; // replacement char

    QTest::newRow("utf8_4") << QByteArray(utf8_4) << QString(QChar(QChar::ReplacementCharacter));

    static const char utf8_5[] = "\360\220\210\203"; // U+010203

    static const uint utf32_5[] = { 0x010203 };

    QTest::newRow("utf8_5") << QByteArray(utf8_5) << QString::fromUcs4(utf32_5, 1);

    static const char utf8_6[] = "\364\217\277\277"; // U+10FFFF

    static const uint utf32_6[] = { 0x10FFFF };

    QTest::newRow("utf8_6") << QByteArray(utf8_6) << QString::fromUcs4(utf32_6, 1);

    static const char utf8_7[] = "abc\302\240\303\241\303\251\307\275 \342\202\254def";

    static const ushort utf16_7[] = { 'a', 'b', 'c', 0x00A0,

                                      0x00E1, 0x00E9, 0x01FD,

                                      ' ', 0x20AC, 'd', 'e', 'f', 0 };

    QTest::newRow("utf8_7") << QByteArray(utf8_7) << QString::fromUtf16(utf16_7);

    static const char utf8_8[] = "abc\302\240\303\241\303\251\307\275 \364\217\277\277 \342\202\254def";

    static const uint utf32_8[] = { 'a', 'b', 'c', 0x00A0,

                                    0x00E1, 0x00E9, 0x01FD,

                                    ' ', 0x10FFFF, ' ',

                                    0x20AC, 'd', 'e', 'f', 0 };

    QTest::newRow("utf8_8") << QByteArray(utf8_8) << QString::fromUcs4(utf32_8);

}

void tst_Utf8::roundTrip()

{

    QFETCH(QByteArray, utf8);

    QFETCH(QString, utf16);

    QCOMPARE((utf16.*to8Bit)(), utf8);

    QCOMPARE(from8Bit(utf8), utf16);

    QCOMPARE((from8Bit(utf8).*to8Bit)(), utf8);

    QCOMPARE(from8Bit((utf16.*to8Bit)()), utf16);

}

void tst_Utf8::charByChar_data()

{

    roundTrip_data();

}

void tst_Utf8::charByChar()

{

    QFETCH(QByteArray, utf8);

    QFETCH(QString, utf16);

    {

        // from utf16 to utf8 char by char:

        QSharedPointer<QTextEncoder> encoder = QSharedPointer<QTextEncoder>(codec->makeEncoder());

        QByteArray encoded;

        for (int i = 0; i < utf16.length(); ++i) {

            encoded += encoder->fromUnicode(utf16.constData() + i, 1);

            QVERIFY(!encoder->hasFailure());

        }

        if (encoded.startsWith(utf8bom))

            encoded = encoded.mid(strlen(utf8bom));

        QCOMPARE(encoded, utf8);

    }

    {

        // from utf8 to utf16 char by char:

        QSharedPointer<QTextDecoder> decoder = QSharedPointer<QTextDecoder>(codec->makeDecoder());

        QString decoded;

        for (int i = 0; i < utf8.length(); ++i) {

            decoded += decoder->toUnicode(utf8.constData() + i, 1);

            QVERIFY(!decoder->hasFailure());

        }

        QCOMPARE(decoded, utf16);

    }

}

void tst_Utf8::invalidUtf8_data()

{

    QTest::addColumn<QByteArray>("utf8");

    QTest::newRow("1char") << QByteArray("\x80");

    QTest::newRow("2chars") << QByteArray("\xC2\xC0");

    QTest::newRow("3chars-1") << QByteArray("\xE0\xA0\xC0");

    QTest::newRow("3chars-2") << QByteArray("\xE0\xC0\xA0");

    QTest::newRow("4chars-1") << QByteArray("\xF0\x90\x80\xC0");

    QTest::newRow("4chars-2") << QByteArray("\xF0\x90\xC0\x80");

    QTest::newRow("4chars-3") << QByteArray("\xF0\xC0\x80\x80");

    // U+FFFE and U+FFFF are non-characters and must not be present

    // U+FFFE:        1111   11 1111   11 1110

    // encoding: xxxz:1111 xz11:1111 xz11:1110

    QTest::newRow("fffe") << QByteArray("\xEF\xBF\xBE");

    // U+FFFF:        1111   11 1111   11 1111

    // encoding: xxxz:1111 xz11:1111 xz11:1111

    QTest::newRow("ffff") << QByteArray("\xEF\xBF\xBF");

    // Surrogate pairs must now be present either

    // U+D800:        1101   10 0000   00 0000

    // encoding: xxxz:1101 xz10:0000 xz00:0000

    QTest::newRow("hi-surrogate") << QByteArray("\xED\xA0\x80");

    // U+DC00:        1101   11 0000   00 0000

    // encoding: xxxz:1101 xz11:0000 xz00:0000

    QTest::newRow("lo-surrogate") << QByteArray("\xED\xB0\x80");

    // not even in pair:

    QTest::newRow("surrogate-pair") << QByteArray("\xED\xA0\x80\xED\xB0\x80");

    // Characters outside the Unicode range:

    // 0x110000:   00 0100   01 0000   00 0000   00 0000

    // encoding: xxxx:z100 xz01:0000 xz00:0000 xz00:0000

    QTest::newRow("non-unicode-1") << QByteArray("\xF4\x90\x80\x80");

    // 0x200000:             00 1000   00 0000   00 0000   00 0000

    // encoding: xxxx:xz00 xz00:1000 xz00:0000 xz00:0000 xz00:0000

    QTest::newRow("non-unicode-2") << QByteArray("\xF8\x88\x80\x80\x80");

    // 0x04000000:              0100   00 0000   00 0000   00 0000   00 0000

    // encoding: xxxx:xxz0 xz00:0100 xz00:0000 xz00:0000 xz00:0001 xz00:0001

    QTest::newRow("non-unicode-3") << QByteArray("\xFC\x84\x80\x80\x80\x80");

    // 0x7fffffff:       1   11 1111   11 1111   11 1111   11 1111   11 1111

    // encoding: xxxx:xxz0 xz00:0100 xz00:0000 xz00:0000 xz00:0001 xz00:0001

    QTest::newRow("non-unicode-3") << QByteArray("\xFD\xBF\xBF\xBF\xBF\xBF");

    // As seen above, 0xFE and 0xFF never appear:

    QTest::newRow("fe") << QByteArray("\xFE");

    QTest::newRow("fe-bis") << QByteArray("\xFE\xBF\xBF\xBF\xBF\xBF\xBF");

    QTest::newRow("ff") << QByteArray("\xFF");

    QTest::newRow("ff-bis") << QByteArray("\xFF\xBF\xBF\xBF\xBF\xBF\xBF\xBF");

    // some combinations in UTF-8 are invalid even though they have the proper bits set

    // these are known as overlong sequences

    // "A": U+0041:                                               01   00 0001

    // overlong 2:                                         xxz0:0001 xz00:0001

    QTest::newRow("overlong-1-2") << QByteArray("\xC1\x81");

    // overlong 3:                               xxxz:0000 xz00:0001 xz00:0001

    QTest::newRow("overlong-1-3") << QByteArray("\xE0\x81\x81");

    // overlong 4:                     xxxx:z000 xz00:0000 xz00:0001 xz00:0001

    QTest::newRow("overlong-1-4") << QByteArray("\xF0\x80\x81\x81");

    // overlong 5:           xxxx:xz00 xz00:0000 xz00:0000 xz00:0001 xz00:0001

    QTest::newRow("overlong-1-5") << QByteArray("\xF8\x80\x80\x81\x81");

    // overlong 6: xxxx:xxz0 xz00:0000 xz00:0000 xz00:0000 xz00:0001 xz00:0001

    QTest::newRow("overlong-1-6") << QByteArray("\xFC\x80\x80\x80\x81\x81");

    // NBSP: U+00A0:                                             10    00 0000

    // proper encoding:                                    xxz0:0010 xz00:0000

    // overlong 3:                               xxxz:0000 xz00:0010 xz00:0000

    QTest::newRow("overlong-2-3") << QByteArray("\xC0\x82\x80");

    // overlong 4:                     xxxx:z000 xz00:0000 xz00:0010 xz00:0000

    QTest::newRow("overlong-2-4") << QByteArray("\xF0\x80\x82\x80");

    // overlong 5:           xxxx:xz00 xz00:0000 xz00:0000 xz00:0010 xz00:0000

    QTest::newRow("overlong-2-4") << QByteArray("\xF8\x80\x80\x82\x80");

    // overlong 6: xxxx:xxz0 xz00:0000 xz00:0000 xz00:0000 xz00:0010 xz00:0000

    QTest::newRow("overlong-2-4") << QByteArray("\xFC\x80\x80\x80\x82\x80");

    // U+0800:                                               10 0000   00 0000

    // proper encoding:                          xxxz:0000 xz10:0000 xz00:0000

    // overlong 4:                     xxxx:z000 xz00:0000 xz10:0000 xz00:0000

    QTest::newRow("overlong-3-4") << QByteArray("\xF0\x80\xA0\x80");

    // overlong 5:           xxxx:xz00 xz00:0000 xz00:0000 xz10:0000 xz00:0000

    QTest::newRow("overlong-3-5") << QByteArray("\xF8\x80\x80\xA0\x80");

    // overlong 6: xxxx:xxz0 xz00:0000 xz00:0000 xz00:0000 xz10:0000 xz00:0000

    QTest::newRow("overlong-3-6") << QByteArray("\xFC\x80\x80\x80\xA0\x80");

    // U+010000:                                   00 0100   00 0000   00 0000

    // proper encoding:                xxxx:z000 xz00:0100 xz00:0000 xz00:0000

    // overlong 5:           xxxx:xz00 xz00:0000 xz00:0100 xz00:0000 xz00:0000

    QTest::newRow("overlong-4-5") << QByteArray("\xF8\x80\x84\x80\x80");

    // overlong 6: xxxx:xxz0 xz00:0000 xz00:0000 xz00:0100 xz00:0000 xz00:0000

    QTest::newRow("overlong-4-6") << QByteArray("\xFC\x80\x80\x84\x80\x80");

}

void tst_Utf8::invalidUtf8()

{

    QFETCH(QByteArray, utf8);

    QFETCH_GLOBAL(bool, useLocale);

    QSharedPointer<QTextDecoder> decoder = QSharedPointer<QTextDecoder>(codec->makeDecoder());

    QString decoded = decoder->toUnicode(utf8);

    // Only enforce correctness on our UTF-8 decoder

    // The system's UTF-8 codec is sometimes buggy

    //  GNU libc's iconv is known to accept U+FFFF and U+FFFE encoded as UTF-8

    //  OS X's iconv is known to accept those, plus surrogates and codepoints above U+10FFFF

    if (!useLocale)

        QVERIFY(decoder->hasFailure());

    else if (!decoder->hasFailure())

        qWarning("System codec does not report failure when it should. Should report bug upstream.");

}

QTEST_MAIN(tst_Utf8)

#include "tst_utf8.moc"