QCacheItem Class Reference

#include <qnetworkdiskcache_p.h>

Public Functions
bool	canCompress () const
	We compress small text and JavaScript files. More...
	QCacheItem ()
bool	read (QFile *device, bool readData)
	Returns false if the file is a cache file, but is an older version and should be removed otherwise true. More...
void	reset ()
qint64	size () const
void	writeCompressedData (QFile *device) const
void	writeHeader (QFile *device) const
	~QCacheItem ()

Public Variables
QBuffer	data
QTemporaryFile *	file
QNetworkCacheMetaData	metaData

Detailed Description

Definition at line 68 of file qnetworkdiskcache_p.h.

Constructors and Destructors

QCacheItem()

QCacheItem::QCacheItem ( )

inline

Definition at line 71 of file qnetworkdiskcache_p.h.

                 : file(0)
    {
    }

~QCacheItem()

QCacheItem::~QCacheItem ( )

inline

Definition at line 74 of file qnetworkdiskcache_p.h.

    {
        reset();
    }

Functions

canCompress()

bool QCacheItem::canCompress

(

)

const

We compress small text and JavaScript files.

Definition at line 638 of file qnetworkdiskcache.cpp.

Referenced by QNetworkDiskCache::prepare(), and reset().

{
    bool sizeOk = false;
    bool typeOk = false;
    foreach (QNetworkCacheMetaData::RawHeader header, metaData.rawHeaders()) {
        if (header.first.toLower() == "content-length") {
            qint64 size = header.second.toLongLong();
            if (size > MAX_COMPRESSION_SIZE)
                return false;
            else
                sizeOk = true;
        }

        if (header.first.toLower() == "content-type") {
            QByteArray type = header.second;
            if (type.startsWith("text/")
                    || (type.startsWith("application/")
                        && (type.endsWith("javascript") || type.endsWith("ecmascript"))))
                typeOk = true;
            else
                return false;
        }
        if (sizeOk && typeOk)
            return true;
    }
    return false;
}

read()

bool QCacheItem::read	(	QFile *	device,
		bool	readData
	)

Returns false if the file is a cache file, but is an older version and should be removed otherwise true.

Definition at line 694 of file qnetworkdiskcache.cpp.

Referenced by reset().

{
    reset();

    QDataStream in(device);

    qint32 marker;
    qint32 v;
    in >> marker;
    in >> v;
    if (marker != CacheMagic)
        return true;

    // If the cache magic is correct, but the version is not we should remove it
    if (v != CurrentCacheVersion)
        return false;

    bool compressed;
    QByteArray dataBA;
    in >> metaData;
    in >> compressed;
    if (readData && compressed) {
        in >> dataBA;
        data.setData(qUncompress(dataBA));
        data.open(QBuffer::ReadOnly);
    }

    // quick and dirty check if metadata's URL field and the file's name are in synch
    QString expectedFilename = QNetworkDiskCachePrivate::uniqueFileName(metaData.url());
    if (!device->fileName().endsWith(expectedFilename))
        return false;

    return metaData.isValid();
}

reset()

void QCacheItem::reset ( )

inline

Definition at line 85 of file qnetworkdiskcache_p.h.

Referenced by ~QCacheItem().

                        {
        metaData = QNetworkCacheMetaData();
        data.close();
        delete file;
        file = 0;
    }

size()

qint64 QCacheItem::size ( ) const

inline

Definition at line 82 of file qnetworkdiskcache_p.h.

Referenced by QNetworkDiskCachePrivate::storeItem().

        { return file ? file->size() : data.size(); }

writeCompressedData()

void QCacheItem::writeCompressedData

(

QFile *

device

)

const

Definition at line 683 of file qnetworkdiskcache.cpp.

Referenced by reset(), and QNetworkDiskCachePrivate::storeItem().

{
    QDataStream out(device);

    out << qCompress(data.data());
}

writeHeader()

void QCacheItem::writeHeader

(

QFile *

device

)

const

Definition at line 672 of file qnetworkdiskcache.cpp.

Referenced by QNetworkDiskCache::prepare(), reset(), and QNetworkDiskCachePrivate::storeItem().

{
    QDataStream out(device);

    out << qint32(CacheMagic);
    out << qint32(CurrentCacheVersion);
    out << metaData;
    bool compressed = canCompress();
    out << compressed;
}

Properties

data

QBuffer QCacheItem::data

Definition at line 80 of file qnetworkdiskcache_p.h.

Referenced by QNetworkDiskCache::prepare(), QNetworkDiskCachePrivate::QNetworkDiskCachePrivate(), and QNetworkDiskCachePrivate::storeItem().

file

QTemporaryFile* QCacheItem::file

Definition at line 81 of file qnetworkdiskcache_p.h.

Referenced by QNetworkDiskCache::prepare(), QNetworkDiskCachePrivate::QNetworkDiskCachePrivate(), reset(), and QNetworkDiskCachePrivate::storeItem().

metaData

QNetworkCacheMetaData QCacheItem::metaData

Definition at line 79 of file qnetworkdiskcache_p.h.

Referenced by QNetworkDiskCache::prepare(), QNetworkDiskCache::remove(), and QNetworkDiskCachePrivate::storeItem().

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The documentation for this class was generated from the following files:

• /src/network/access/qnetworkdiskcache_p.h
• /src/network/access/qnetworkdiskcache.cpp