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#include "versitutils_p.h"

#include "qmobilityglobal.h"

#include <QMap>

#include <QTextCodec>

#include <QScopedPointer>

QTM_USE_NAMESPACE

QTextCodec* VersitUtils::m_previousCodec = 0;

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

QByteArray VersitUtils::m_encodingMap[256];

/*!

 * 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;

}