source: trunk/src/network/access/qnetworkaccessfilebackend.cpp@ 561

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#include "qnetworkaccessfilebackend_p.h"
#include "qfileinfo.h"
#include "qurlinfo.h"
#include "qdir.h"
#include "private/qnoncontiguousbytedevice_p.h"

#include <QtCore/QCoreApplication>

QT_BEGIN_NAMESPACE

QNetworkAccessBackend *
QNetworkAccessFileBackendFactory::create(QNetworkAccessManager::Operation op,
                                         const QNetworkRequest &request) const
{
    // is it an operation we know of?
    switch (op) {
    case QNetworkAccessManager::GetOperation:
    case QNetworkAccessManager::PutOperation:
        break;

    default:
        // no, we can't handle this operation
        return 0;
    }

    QUrl url = request.url();
    if (url.scheme() == QLatin1String("qrc") || !url.toLocalFile().isEmpty())
        return new QNetworkAccessFileBackend;
    else if (!url.isEmpty() && url.authority().isEmpty()) {
        // check if QFile could, in theory, open this URL
        QFileInfo fi(url.toString(QUrl::RemoveAuthority | QUrl::RemoveFragment | QUrl::RemoveQuery));
        if (fi.exists() || (op == QNetworkAccessManager::PutOperation && fi.dir().exists()))
            return new QNetworkAccessFileBackend;
    }

    return 0;
}

QNetworkAccessFileBackend::QNetworkAccessFileBackend()
    : uploadByteDevice(0), totalBytes(0), hasUploadFinished(false)
{
}

QNetworkAccessFileBackend::~QNetworkAccessFileBackend()
{
}

void QNetworkAccessFileBackend::open()
{
    QUrl url = this->url();

    if (url.host() == QLatin1String("localhost"))
        url.setHost(QString());
#if !defined(Q_OS_WIN)
    // do not allow UNC paths on Unix
    if (!url.host().isEmpty()) {
        // we handle only local files
        error(QNetworkReply::ProtocolInvalidOperationError,
              QCoreApplication::translate("QNetworkAccessFileBackend", "Request for opening non-local file %1").arg(url.toString()));
        finished();
        return;
    }
#endif // !defined(Q_OS_WIN)
    if (url.path().isEmpty())
        url.setPath(QLatin1String("/"));
    setUrl(url);

    QString fileName = url.toLocalFile();
    if (fileName.isEmpty()) {
        if (url.scheme() == QLatin1String("qrc"))
            fileName = QLatin1Char(':') + url.path();
        else
            fileName = url.toString(QUrl::RemoveAuthority | QUrl::RemoveFragment | QUrl::RemoveQuery);
    }
    file.setFileName(fileName);

    if (operation() == QNetworkAccessManager::GetOperation) {
        if (!loadFileInfo())
            return;
    }

    QIODevice::OpenMode mode;
    switch (operation()) {
    case QNetworkAccessManager::GetOperation:
        mode = QIODevice::ReadOnly;
        break;
    case QNetworkAccessManager::PutOperation:
        mode = QIODevice::WriteOnly | QIODevice::Truncate;
        uploadByteDevice = createUploadByteDevice();
        QObject::connect(uploadByteDevice, SIGNAL(readyRead()), this, SLOT(uploadReadyReadSlot()));
        QMetaObject::invokeMethod(this, "uploadReadyReadSlot", Qt::QueuedConnection);
        break;
    default:
        Q_ASSERT_X(false, "QNetworkAccessFileBackend::open",
                   "Got a request operation I cannot handle!!");
        return;
    }

    mode |= QIODevice::Unbuffered;
    bool opened = file.open(mode);

    // could we open the file?
    if (!opened) {
        QString msg = QCoreApplication::translate("QNetworkAccessFileBackend", "Error opening %1: %2")
                                                .arg(this->url().toString(), file.errorString());

        // why couldn't we open the file?
        // if we're opening for reading, either it doesn't exist, or it's access denied
        // if we're opening for writing, not existing means it's access denied too
        if (file.exists() || operation() == QNetworkAccessManager::PutOperation)
            error(QNetworkReply::ContentAccessDenied, msg);
        else
            error(QNetworkReply::ContentNotFoundError, msg);
        finished();
    }
}

void QNetworkAccessFileBackend::uploadReadyReadSlot()
{
    if (hasUploadFinished)
        return;

    forever {
        qint64 haveRead;
        const char *readPointer = uploadByteDevice->readPointer(-1, haveRead);
        if (haveRead == -1) {
            // EOF
            hasUploadFinished = true;
            file.flush();
            file.close();
            finished();
            break;