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#include "qplatformdefs.h"
#include "qurl.h"
#include "private/qdataurl_p.h"

QT_BEGIN_NAMESPACE

/*!
    \internal

    Decode a data: URL into its mimetype and payload. Returns a null string if
    the URL could not be decoded.
*/
Q_CORE_EXPORT QPair<QString, QByteArray> qDecodeDataUrl(const QUrl &uri)
{
    QString mimeType;
    QByteArray payload;

    if (uri.scheme() == QLatin1String("data") && uri.host().isEmpty()) {
        mimeType = QLatin1String("text/plain;charset=US-ASCII");

        // the following would have been the correct thing, but
        // reality often differs from the specification. People have
        // data: URIs with ? and #
        //QByteArray data = QByteArray::fromPercentEncoding(uri.encodedPath());
        QByteArray data = QByteArray::fromPercentEncoding(uri.toEncoded());

        // remove the data: scheme
        data.remove(0, 5);

        // parse it:
        int pos = data.indexOf(',');
        if (pos != -1) {
            payload = data.mid(pos + 1);
            data.truncate(pos);
            data = data.trimmed();

            // find out if the payload is encoded in Base64
            if (data.endsWith(";base64")) {
                payload = QByteArray::fromBase64(payload);
                data.chop(7);
            }

            if (data.toLower().startsWith("charset")) {
                int i = 7;      // strlen("charset")
                while (data.at(i) == ' ')
                    ++i;
                if (data.at(i) == '=')
                    data.prepend("text/plain;");
            }

            if (!data.isEmpty())
                mimeType = QLatin1String(data.trimmed());

        }
    }

    return QPair<QString,QByteArray>(mimeType,payload);
}

QT_END_NAMESPACE