#include <QTextCodec>

#include <QScopedPointer>

QTM_USE_NAMESPACE

QTextCodec* VersitUtils::m_previousCodec = 0;

QList<QByteArrayMatcher>* VersitUtils::m_newlineList = 0;

QByteArray VersitUtils::m_encodingMap[256];

 * Performs backslash escaping for line breaks (CRLFs), semicolons, backslashes and commas according

 * to RFC 2426.  This is called on parameter names and values and property values.

 * Colons ARE NOT escaped because the examples in RFC2426 suggest that they shouldn't be.

void VersitUtils::backSlashEscape(QString& text)

    /* replaces ; with \;

                , with \,

                \ with \\

     */

    text.replace(QRegExp(QLatin1String("([;,\\\\])")), QLatin1String("\\\\1"));

    // replaces any CRLFs with \n

    text.replace(QRegExp(QLatin1String("\r\n|\r|\n")), QLatin1String("\\n"));

 * Removes backslash escaping for line breaks (CRLFs), colons, semicolons, backslashes and commas

 * according to RFC 2426.  This is called on parameter names and values and property values.

 * Colons ARE unescaped because the text of RFC2426 suggests that they should be.

void VersitUtils::removeBackSlashEscaping(QString& text)

    if (!(text.startsWith(QLatin1Char('"')) && text.endsWith(QLatin1Char('"')))) {

        /* replaces \; with ;

                    \, with ,

                    \: with :

                    \\ with \

         */

        text.replace(QRegExp(QLatin1String("\\\\([;,:\\\\])")), QLatin1String("\\1"));

        // replaces \n with a CRLF

        text.replace(QLatin1String("\\n"), QLatin1String("\r\n"), Qt::CaseInsensitive);

 * Encode \a ch with \a codec, without adding an byte-order mark

QByteArray VersitUtils::encode(char ch, QTextCodec* codec)

    if (codec != m_previousCodec) {

        changeCodec(codec);

    return m_encodingMap[(int)ch];

 * Encode \a ba with \a codec, without adding an byte-order mark.  \a ba is interpreted as ASCII

QByteArray VersitUtils::encode(const QByteArray& ba, QTextCodec* codec)

    QTextCodec::ConverterState state(QTextCodec::IgnoreHeader);

    return codec->fromUnicode(QString::fromAscii(ba.data()).data(), ba.length(), &state);

 * Returns the list of DOS, UNIX and Mac newline characters for \a codec.

QList<QByteArrayMatcher>* VersitUtils::newlineList(QTextCodec* codec)

    if (m_newlineList != 0 && codec == m_previousCodec) {

        return m_newlineList;

    changeCodec(codec);

    return m_newlineList;

 * Update the cached tables of pregenerated encoded text with \a codec.

void VersitUtils::changeCodec(QTextCodec* codec) {

    // Build m_encodingMap

    QChar qch;

    QTextCodec::ConverterState state(QTextCodec::IgnoreHeader);

    for (int c = 0; c < 256; c++) {

        qch = QLatin1Char(c);

        m_encodingMap[c] = codec->fromUnicode(&qch, 1, &state);

    // Build m_newlineList

    if (m_newlineList != 0)

        delete m_newlineList;

    m_newlineList = new QList<QByteArrayMatcher>;

    m_newlineList->append(QByteArrayMatcher(encode("\r\n", codec)));

    m_newlineList->append(QByteArrayMatcher(encode("\n", codec)));

    m_newlineList->append(QByteArrayMatcher(encode("\r", codec)));

    m_previousCodec = codec;