diff -r a1f515018ac1 -r b39122337a00 browsercore/core/network/networkdiskcache.cpp --- a/browsercore/core/network/networkdiskcache.cpp Mon Jul 12 15:46:53 2010 -0400 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,789 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). -** All rights reserved. -** Contact: Nokia Corporation (qt-info@nokia.com) -** -** This file is part of the QtNetwork module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:LGPL$ -** Commercial Usage -** Licensees holding valid Qt Commercial licenses may use this file in -** accordance with the Qt Commercial License Agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and Nokia. -** -** GNU Lesser General Public License Usage -** Alternatively, this file may be used under the terms of the GNU Lesser -** General Public License version 2.1 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPL included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 2.1 requirements -** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. -** -** In addition, as a special exception, Nokia gives you certain additional -** rights. These rights are described in the Nokia Qt LGPL Exception -** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 3.0 as published by the Free Software -** Foundation and appearing in the file LICENSE.GPL included in the -** packaging of this file. Please review the following information to -** ensure the GNU General Public License version 3.0 requirements will be -** met: http://www.gnu.org/copyleft/gpl.html. -** -** If you have questions regarding the use of this file, please contact -** Nokia at qt-info@nokia.com. -** $QT_END_LICENSE$ -** -****************************************************************************/ - -//#define QNETWORKDISKCACHE_DEBUG - -#ifndef QT_NO_NETWORKDISKCACHE - -#include "networkdiskcache.h" -#include "networkdiskcache_p.h" -#include "QtCore/qscopedpointer.h" - -#include -#include -#include -#include -#include - -#include - - -#define MAX_COMPRESSION_SIZE (1024 * 1024 * 3) -#define CACHE_SUBDIR_COUNT 16 - -QT_BEGIN_NAMESPACE - -/*! - \class QNetworkDiskCache - \since 4.5 - \inmodule QtNetwork - - \brief The QNetworkDiskCache class provides a very basic disk cache. - - QNetworkDiskCache stores each url in its own file inside of the - cacheDirectory using QDataStream. Files with a text MimeType - are compressed using qCompress. Each cache file starts with "cache_" - and ends in ".cache". Data is written to disk only in insert() - and updateMetaData(). - - Currently you can not share the same cache files with more then - one disk cache. - - QNetworkDiskCache by default limits the amount of space that the cache will - use on the system to 50MB. - - Note you have to set the cache directory before it will work. - - A network disk cache can be enabled by: - - \snippet doc/src/snippets/code/src_network_access_qnetworkdiskcache.cpp 0 - - When sending requests, to control the preference of when to use the cache - and when to use the network, consider the following: - - \snippet doc/src/snippets/code/src_network_access_qnetworkdiskcache.cpp 1 - - To check whether the response came from the cache or from the network, the - following can be applied: - - \snippet doc/src/snippets/code/src_network_access_qnetworkdiskcache.cpp 2 -*/ - -/*! - Creates a new disk cache. The \a parent argument is passed to - QAbstractNetworkCache's constructor. - */ -NetworkDiskCache::NetworkDiskCache(QObject *parent) - : QAbstractNetworkCache(*new NetworkDiskCachePrivate, parent) -{ -} - -/*! - Destroys the cache object. This does not clear the disk cache. - */ -NetworkDiskCache::~NetworkDiskCache() -{ - Q_D(NetworkDiskCache); - QHashIterator it(d->inserting); - while (it.hasNext()) { - it.next(); - delete it.value(); - } -} - -/*! - Returns the location where cached files will be stored. -*/ -QString NetworkDiskCache::cacheDirectory() const -{ - Q_D(const NetworkDiskCache); - return d->cacheDirectory; -} - -/*! - Sets the directory where cached files will be stored to \a cacheDir - - QNetworkDiskCache will create this directory if it does not exists. - - Prepared cache items will be stored in the new cache directory when - they are inserted. - - \sa QDesktopServices::CacheLocation -*/ -void NetworkDiskCache::setCacheDirectory(const QString &cacheDir) -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::setCacheDirectory()" << cacheDir; -#endif - Q_D(NetworkDiskCache); - if (cacheDir.isEmpty()) - return; - d->cacheDirectory = cacheDir; - QDir cDir(d->cacheDirectory); - d->cacheDirectory = cDir.absolutePath(); - if (!d->cacheDirectory.endsWith(QLatin1Char('/'))) - d->cacheDirectory += QLatin1Char('/'); - - QDir dir; - // Setup and create directories - if (!QFile::exists(d->cacheDirectory)) - { - // ### make a static QDir function for this... - dir.mkpath(d->cacheDirectory); - } - - QString subDirectory; - for (int i = 0; i < CACHE_SUBDIR_COUNT; i++) - { - subDirectory = d->cacheDirectory + QString("%1").arg(i, 0, 16) + QLatin1Char('/'); - if (!QFile::exists(subDirectory)) - { - dir.mkpath(subDirectory); - } - } - - // For Temporary Prepared Directory - dir.mkpath(d->cacheDirectory + QLatin1String("prepared/")); -} - -/*! - \reimp -*/ -qint64 NetworkDiskCache::cacheSize() const -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::cacheSize()"; -#endif - Q_D(const NetworkDiskCache); - if (d->cacheDirectory.isEmpty()) - return 0; - if (d->currentCacheSize < 0) { - NetworkDiskCache *that = const_cast(this); - that->d_func()->currentCacheSize = that->expire(); - } - return d->currentCacheSize; -} - -/*! - \reimp -*/ -QIODevice *NetworkDiskCache::prepare(const QNetworkCacheMetaData &metaData) -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::prepare()" << metaData.url(); -#endif - Q_D(NetworkDiskCache); - if (!metaData.isValid() || !metaData.url().isValid() || !metaData.saveToDisk()) - return 0; - - if (d->cacheDirectory.isEmpty()) { - qWarning() << "NetworkDiskCache::prepare() The cache directory is not set"; - return 0; - } - - foreach (QNetworkCacheMetaData::RawHeader header, metaData.rawHeaders()) { - if (header.first.toLower() == "content-length") { - qint64 size = header.second.toInt(); - if (size > (maximumCacheSize() * 3)/4) - return 0; - break; - } - } - QScopedPointer cacheItem(new QCacheItem); - cacheItem->metaData = metaData; - - QIODevice *device = 0; - if (cacheItem->canCompress()) { - cacheItem->data.open(QBuffer::ReadWrite); - device = &(cacheItem->data); - } else { - QString templateName = d->tmpCacheFileName(); - QT_TRY { - cacheItem->file = new QTemporaryFile(templateName, &cacheItem->data); - } QT_CATCH(...) { - cacheItem->file = 0; - } - if (!cacheItem->file || !cacheItem->file->open()) { - qWarning() << "NetworkDiskCache::prepare() unable to open temporary file"; - cacheItem.reset(); - return 0; - } - cacheItem->writeHeader(cacheItem->file); - device = cacheItem->file; - } - d->inserting[device] = cacheItem.take(); - return device; -} - -/*! - \reimp -*/ -void NetworkDiskCache::insert(QIODevice *device) -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::insert()" << device; -#endif - Q_D(NetworkDiskCache); - QHash::iterator it = d->inserting.find(device); - if (it == d->inserting.end()) { - qWarning() << "NetworkDiskCache::insert() called on a device we don't know about" << device; - return; - } - - d->storeItem(it.value()); - delete it.value(); - d->inserting.erase(it); -} - -// CRC32 implementation. -// Could be made into new API QByteArray:qChecksum32() -static const quint32 crc_tbl32[256] = { - 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, - 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, - 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, - 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, - 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, - 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, - 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, - 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, - 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, - 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, - 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, - 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, - 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, - 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, - 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, - 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, - 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, - 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, - 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, - 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, - 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, - 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, - 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, - 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, - 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, - 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, - 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, - 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, - 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, - 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, - 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, - 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, - 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, - 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, - 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, - 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, - 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, - 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, - 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, - 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, - 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, - 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, - 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, - 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, - 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, - 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, - 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, - 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, - 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, - 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, - 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, - 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, - 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, - 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, - 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, - 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, - 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, - 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, - 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, - 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, - 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, - 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, - 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, - 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d -}; - -quint32 NetworkDiskCachePrivate::crc32(const char *data, uint len) -{ - const uchar *p = reinterpret_cast(data); - const uchar *q = p + len; - const quint32 init = 0xFFFFFFFFL; - - quint32 crc32 = init; - while (p < q) { - crc32 = (crc32 >> 8) ^ crc_tbl32[(crc32 ^ *p++) & 0xffL]; - } - return crc32 ^ init ; -} - -void NetworkDiskCachePrivate::storeItem(QCacheItem *cacheItem) -{ - Q_Q(NetworkDiskCache); - - // just an idea of not caching anything more than 15k - //if (cacheItem->size() > (15*1024)) return; - - Q_ASSERT(cacheItem->metaData.saveToDisk()); - - QString fileName = cacheFileName(cacheItem->metaData.url()); - Q_ASSERT(!fileName.isEmpty()); - - if (QFile::exists(fileName)) { - if (!QFile::remove(fileName)) { - qWarning() << "NetworkDiskCache: couldn't remove the cache file " << fileName; - return; - } - } - - if (currentCacheSize > 0) - currentCacheSize += 1024 + cacheItem->size(); - currentCacheSize = q->expire(); - if (!cacheItem->file) { - QString templateName = tmpCacheFileName(); - cacheItem->file = new QTemporaryFile(templateName, &cacheItem->data); - if (cacheItem->file->open()) { - cacheItem->writeHeader(cacheItem->file); - cacheItem->writeCompressedData(cacheItem->file); - } - } - - if (cacheItem->file - && cacheItem->file->isOpen() - && cacheItem->file->error() == QFile::NoError) { - cacheItem->file->setAutoRemove(false); - // ### use atomic rename rather then remove & rename - if (cacheItem->file->rename(fileName)) - currentCacheSize += cacheItem->file->size(); - else - cacheItem->file->setAutoRemove(true); - } - if (cacheItem->metaData.url() == lastItem.metaData.url()) - lastItem.reset(); -} - -/*! - \reimp -*/ -bool NetworkDiskCache::remove(const QUrl &url) -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::remove()" << url; -#endif - Q_D(NetworkDiskCache); - - // remove is also used to cancel insertions, not a common operation - QHashIterator it(d->inserting); - while (it.hasNext()) { - it.next(); - QCacheItem *item = it.value(); - if (item && item->metaData.url() == url) { - delete item; - d->inserting.remove(it.key()); - return true; - } - } - - if (d->lastItem.metaData.url() == url) - d->lastItem.reset(); - return d->removeFile(d->cacheFileName(url)); -} - -/*! - Put all of the misc file removing into one function to be extra safe - */ -bool NetworkDiskCachePrivate::removeFile(const QString &file) -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::removeFile()" << file; -#endif - if (file.isEmpty()) - return false; - QFileInfo info(file); - QString fileName = info.fileName(); - qint64 size = info.size(); - if (QFile::remove(file)) { - currentCacheSize -= size; - return true; - } - return false; -} - -/*! - \reimp -*/ -QNetworkCacheMetaData NetworkDiskCache::metaData(const QUrl &url) -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::metaData()" << url; -#endif - Q_D(NetworkDiskCache); - if (d->lastItem.metaData.url() == url) - return d->lastItem.metaData; - return fileMetaData(d->cacheFileName(url)); -} - -/*! - Returns the QNetworkCacheMetaData for the cache file \a fileName. - - If \a fileName is not a cache file QNetworkCacheMetaData will be invalid. - */ -QNetworkCacheMetaData NetworkDiskCache::fileMetaData(const QString &fileName) const -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::fileMetaData()" << fileName; -#endif - Q_D(const NetworkDiskCache); - QFile file(fileName); - if (!file.open(QFile::ReadOnly)) - return QNetworkCacheMetaData(); - if (!d->lastItem.read(&file, false)) { - file.close(); - NetworkDiskCachePrivate *that = const_cast(d); - that->removeFile(fileName); - } - return d->lastItem.metaData; -} - -/*! - \reimp -*/ -QIODevice *NetworkDiskCache::data(const QUrl &url) -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::data()" << url; -#endif - Q_D(NetworkDiskCache); - QScopedPointer buffer; - if (!url.isValid()) - return 0; - if (d->lastItem.metaData.url() == url && d->lastItem.data.isOpen()) { - buffer.reset(new QBuffer); - buffer->setData(d->lastItem.data.data()); - } else { - QScopedPointer file(new QFile(d->cacheFileName(url))); - if (!file->open(QFile::ReadOnly | QIODevice::Unbuffered)) - return 0; - - if (!d->lastItem.read(file.data(), true)) { - file->close(); - remove(url); - return 0; - } - if (d->lastItem.data.isOpen()) { - // compressed - buffer.reset(new QBuffer); - buffer->setData(d->lastItem.data.data()); - } else { - buffer.reset(new QBuffer); - // ### verify that QFile uses the fd size and not the file name - qint64 size = file->size() - file->pos(); - const uchar *p = 0; -#ifndef Q_OS_WINCE - p = file->map(file->pos(), size); -#endif - if (p) { - buffer->setData((const char *)p, size); - file.take()->setParent(buffer.data()); - } else { - buffer->setData(file->readAll()); - } - } - } - buffer->open(QBuffer::ReadOnly); - return buffer.take(); -} - -/*! - \reimp -*/ -void NetworkDiskCache::updateMetaData(const QNetworkCacheMetaData &metaData) -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::updateMetaData()" << metaData.url(); -#endif - QUrl url = metaData.url(); - QIODevice *oldDevice = data(url); - if (!oldDevice) { -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::updateMetaData(), no device!"; -#endif - return; - } - - QIODevice *newDevice = prepare(metaData); - if (!newDevice) { -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::updateMetaData(), no new device!" << url; -#endif - return; - } - char data[1024]; - while (!oldDevice->atEnd()) { - qint64 s = oldDevice->read(data, 1024); - newDevice->write(data, s); - } - delete oldDevice; - insert(newDevice); -} - -/*! - Returns the current maximum size for the disk cache. - - \sa setMaximumCacheSize() - */ -qint64 NetworkDiskCache::maximumCacheSize() const -{ - Q_D(const NetworkDiskCache); - return d->maximumCacheSize; -} - -/*! - Sets the maximum size of the disk cache to be \a size. - - If the new size is smaller then the current cache size then the cache will call expire(). - - \sa maximumCacheSize() - */ -void NetworkDiskCache::setMaximumCacheSize(qint64 size) -{ - Q_D(NetworkDiskCache); - bool expireCache = (size < d->maximumCacheSize); - d->maximumCacheSize = size; - if (expireCache) - d->currentCacheSize = expire(); -} - -/*! - Cleans the cache so that its size is under the maximum cache size. - Returns the current size of the cache. - - When the current size of the cache is greater than the maximumCacheSize() - older cache files are removed until the total size is less then 90% of - maximumCacheSize() starting with the oldest ones first using the file - creation date to determine how old a cache file is. - - Subclasses can reimplement this function to change the order that cache - files are removed taking into account information in the application - knows about that QNetworkDiskCache does not, for example the number of times - a cache is accessed. - - Note: cacheSize() calls expire if the current cache size is unknown. - - \sa maximumCacheSize(), fileMetaData() - */ -qint64 NetworkDiskCache::expire() -{ - Q_D(NetworkDiskCache); - if (d->currentCacheSize >= 0 && d->currentCacheSize < maximumCacheSize()) - return d->currentCacheSize; - - if (cacheDirectory().isEmpty()) { - qWarning() << "NetworkDiskCache::expire() The cache directory is not set"; - return 0; - } - - QDir::Filters filters = QDir::AllDirs | QDir:: Files | QDir::NoDotAndDotDot; - QDirIterator it(cacheDirectory(), filters, QDirIterator::Subdirectories); - - QMultiMap cacheItems; - qint64 totalSize = 0; - while (it.hasNext()) { - QString path = it.next(); - QFileInfo info = it.fileInfo(); - QString fileName = info.fileName(); - cacheItems.insert(info.created(), path); - totalSize += info.size(); - } - - int removedFiles = 0; - qint64 goal = (maximumCacheSize() * 9) / 10; - QMultiMap::const_iterator i = cacheItems.constBegin(); - while (i != cacheItems.constEnd()) { - if (totalSize < goal) - break; - QString name = i.value(); - QFile file(name); - qint64 size = file.size(); - file.remove(); - totalSize -= size; - ++removedFiles; - ++i; - } -#if defined(QNETWORKDISKCACHE_DEBUG) - if (removedFiles > 0) { - qDebug() << "NetworkDiskCache::expire()" - << "Removed:" << removedFiles - << "Kept:" << cacheItems.count() - removedFiles; - } -#endif - if (removedFiles > 0) - d->lastItem.reset(); - return totalSize; -} - -/*! - \reimp -*/ -void NetworkDiskCache::clear() -{ -#if defined(QNETWORKDISKCACHE_DEBUG) - qDebug() << "NetworkDiskCache::clear()"; -#endif - Q_D(NetworkDiskCache); - qint64 size = d->maximumCacheSize; - d->maximumCacheSize = 0; - d->currentCacheSize = expire(); - d->maximumCacheSize = size; -} - -QByteArray NetworkDiskCachePrivate::generateId(const QUrl &url) const -{ - QUrl cleanUrl = url; - cleanUrl.setPassword(QString()); - cleanUrl.setFragment(QString()); - QByteArray blob = cleanUrl.toEncoded(); - - QByteArray hash; - hash.setNum(crc32(blob.data(), blob.length()), 16); - return hash; -} - -QString NetworkDiskCachePrivate::tmpCacheFileName() const -{ - return cacheDirectory + QLatin1String("prepared/") + QLatin1String("XXXXXX"); -} - -QString NetworkDiskCachePrivate::cacheFileName(const QUrl &url) const -{ - if (!url.isValid()) - return QString(); - - // Directories were already created during setup phase. - QString subDirectory; - QByteArray filenameID; - filenameID = generateId(url); - subDirectory = cacheDirectory + QLatin1Char(filenameID.at(0)) + QLatin1Char('/'); - - return subDirectory + QLatin1String(filenameID); -} - -/*! - We compress small text and JavaScript files. - */ -bool QCacheItem::canCompress() const -{ - 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; -} - -enum -{ - CacheMagic = 0xe8, - CurrentCacheVersion = 7 -}; - -void QCacheItem::writeHeader(QFile *device) const -{ - QDataStream out(device); - - out << qint32(CacheMagic); - out << qint32(CurrentCacheVersion); - out << metaData; - bool compressed = canCompress(); - out << compressed; -} - -void QCacheItem::writeCompressedData(QFile *device) const -{ - QDataStream out(device); - - out << qCompress(data.data()); -} - -/*! - Returns false if the file is a cache file, - but is an older version and should be removed otherwise true. - */ -bool QCacheItem::read(QFile *device, bool readData) -{ - 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); - } - return metaData.isValid(); -} - -QT_END_NAMESPACE - -#endif // QT_NO_NETWORKDISKCACHE