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#include "qversitdocumentwriter_p.h"
#include "versitutils_p.h"
#include <QTextCodec>

QTM_USE_NAMESPACE

#define MAX_LINE_LENGTH 76

/*!
  \class QVersitDocumentWriter
  \internal
  \brief The QVersitDocumentWriter class provides an interface for writing a
  single versit document into a vCard text string.
 */

/*! Constructs a writer.
 * \a documentType is the type of Versit document, as printed on the BEGIN line of output
 * eg. "VCARD"
 * \a version is the version of the Versit format, as printed on the VERSION line of output.
 * eg. "2.1"
 */
QVersitDocumentWriter::QVersitDocumentWriter(
    const QByteArray& documentType,
    const QByteArray& version)
    : mDocumentType(documentType),
    mVersion(version),
    mCodec(0),
    mEncoder(0),
    mUtf8Encoder(QTextCodec::codecForName("UTF-8")->makeEncoder()),
    mSuccessful(true),
    mCurrentLineLength(0)
{
    // Hack so the encoder doesn't output a byte order mark for UTF-8.
    mUtf8Encoder->fromUnicode(QString());
}

QVersitDocumentWriter::~QVersitDocumentWriter()
{
    if (mEncoder)
        delete mEncoder;
    delete mUtf8Encoder;
}

/*!
  Sets the codec to write with.
  */
void QVersitDocumentWriter::setCodec(QTextCodec *codec)
{
    if (mEncoder)
        delete mEncoder;
    mCodec = codec;
    mEncoder = codec->makeEncoder();

    // Hack so the encoder doesn't output a byte order mark for UTF-8.
    if (mCodec->name() == "UTF-8")
        mEncoder->fromUnicode(QString());
}

/*!
  Sets the device to write to.
  */
void QVersitDocumentWriter::setDevice(QIODevice *device)
{
    mDevice = device;
}

/*!
* Encodes the \a document and writes it to the device
*/
void QVersitDocumentWriter::encodeVersitDocument(const QVersitDocument& document)
{
    mSuccessful = true;
    QList<QVersitProperty> properties = document.properties();

    writeString(QLatin1String("BEGIN:" + mDocumentType));
    writeCrlf();
    writeString(QLatin1String("VERSION:" + mVersion));
    writeCrlf();
    foreach (QVersitProperty property, properties) {
        encodeVersitProperty(property);
    }
    writeString(QLatin1String("END:" + mDocumentType));
    writeCrlf();
}

/*!
 * Encodes the groups and name in the \a property and writes it to the device
 */
void QVersitDocumentWriter::encodeGroupsAndName(const QVersitProperty& property)
{
    QStringList groups = property.groups();
    if (!groups.isEmpty()) {
        writeString(groups.join(QLatin1String(".")));
        writeString(QLatin1String("."));
    }
    writeString(property.name());
}

/*!
  Writes \a string to the device.
  If \a useUtf8 is true, uses the UTF-8 codec instead of the one set in setCodec().

  This function tracks how many characters have been written to the line and folds (wraps) the line
  according to RFC2425.
  */
void QVersitDocumentWriter::writeString(const QString &string, bool useUtf8)
{
    QString value(string); // nonconst copy
    QTextEncoder* encoder = useUtf8 ? mUtf8Encoder : mEncoder;
    int spaceRemaining = MAX_LINE_LENGTH - mCurrentLineLength;
    while (spaceRemaining < value.length()) {
        // Write the first "spaceRemaining" characters
        QString line(value.left(spaceRemaining));
        value.remove(0, spaceRemaining);
        if (mDevice->write(encoder->fromUnicode(line + QLatin1String("\r\n "))) < 0)
            mSuccessful = false;
        spaceRemaining = MAX_LINE_LENGTH - 1; // minus 1 for the space at the front.
        mCurrentLineLength = 1;
    }

    if (mDevice->write(encoder->fromUnicode(value)) < 0)
        mSuccessful = false;
    mCurrentLineLength += value.length();
}

/*!
  Writes a CRLF to the device.  By using this function, rather than writeString("\\r\\n"), you will
  allow the writer to know where a line starts, for folding purposes.
  */
void QVersitDocumentWriter::writeCrlf()
{
    writeString(QLatin1String("\r\n"));
    mCurrentLineLength = 0;
}
