loader.h

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/*
    This file is part of the KDE libraries

    Copyright (C) 1998 Lars Knoll ([e-mail])
    Copyright (C) 2001 Dirk Mueller <[e-mail]>
    Copyright (C) 2004 Apple Computer, Inc.

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.

    This class provides all functionality needed for loading images, style sheets and html
    pages from the web. It has a memory cache for these objects.
*/
#ifndef _khtml_loader_h
#define _khtml_loader_h

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <time.h>

#include "loader_client.h"
#ifdef HAVE_LIBJPEG
#include "loader_jpeg.h"
#endif

#include <stdlib.h>
#include <qptrlist.h>
#include <qobject.h>
#include <qptrdict.h>
#include <qdict.h>
#include <qpixmap.h>
#include <qbuffer.h>
#include <qstringlist.h>
#include <qtextcodec.h>

#include <kurl.h>
#include <kio/global.h>

#include <khtml_settings.h>
#include <dom/dom_string.h>

class QMovie;
class KHTMLPart;

namespace KIO {
  class Job;
  class TransferJob;
}

namespace DOM
{
    class CSSStyleSheetImpl;
    class DocumentImpl;
};

#if APPLE_CHANGES

class KWQLoader;

#if __OBJC__
@class NSData;
@class NSURLResponse;
#else
class NSData;
class NSURLResponse;
#endif

#endif

namespace khtml
{
    class CachedObject;
    class Request;
    class DocLoader;

 #define MAX_LRU_LISTS 20

    struct LRUList {
        CachedObject* m_head;
        CachedObject* m_tail;

        LRUList();
        ~LRUList();
    };

    /**
     * @internal
     *
     * A cached object. Classes who want to use this object should derive
     * from CachedObjectClient, to get the function calls in case the requested data has arrived.
     *
     * This class also does the actual communication with kio and loads the file.
     */
    class CachedObject
    OOM_MODIFIED
    {
    public:
	enum Type {
	    Image,
	    CSSStyleSheet,
	    Script
#ifdef KHTML_XSLT
            , XSLStyleSheet
#endif
#ifndef KHTML_NO_XBL
            , XBL
#endif
	};

	enum Status {
	    NotCached,    // this URL is not cached
	    Unknown,      // let imagecache decide what to do with it
	    New,          // inserting new image
        Pending,      // only partially loaded
	    Persistent,   // never delete this pixmap
	    Cached,       // regular case
	    Uncacheable   // too big to be cached,
	};  	          // will be destroyed as soon as possible

	CachedObject(const DOM::DOMString &url, Type type, KIO::CacheControl _cachePolicy, time_t _expireDate, int size = 0)
	{
	    m_url = url;
	    m_type = type;
	    m_status = Pending;
	    m_size = size;
	    m_free = false;
	    m_cachePolicy = _cachePolicy;
	    m_request = 0;
#if APPLE_CHANGES
        m_response = 0;
#if !NOKIA_CHANGES
        m_allData = 0;
#endif
#endif
	    m_expireDate = _expireDate;
        m_deleted = false;
        m_expireDateChanged = false;

        m_accessCount = 0;

        m_nextInLRUList = 0;
        m_prevInLRUList = 0;
	}
	virtual ~CachedObject();

	virtual void data( QBuffer &buffer, bool eof) = 0;
	virtual void error( int err, const char *text ) = 0;

	const DOM::DOMString &url() const { return m_url; }
	Type type() const { return m_type; }

	virtual void ref(CachedObjectClient *consumer);
	virtual void deref(CachedObjectClient *consumer);

	int count() const { return m_clients.count(); }

	Status status() const { return m_status; }

	int size() const { return m_size; }

    int accessCount() const { return m_accessCount; }
    void increaseAccessCount() { m_accessCount++; }

	/**
	 * computes the status of an object after loading.
	 * the result depends on the objects size and the size of the cache
	 * also updates the expire date on the cache entry file
	 */
	void finish();

        /**
         * Called by the cache if the object has been removed from the cache dict
         * while still being referenced. This means the object should kill itself
         * if its reference counter drops down to zero.
         */
        void setFree( bool b ) { m_free = b; }

        KIO::CacheControl cachePolicy() const { return m_cachePolicy; }

        void setRequest(Request *_request);

#if NOKIA_CHANGES
        MWebCoreUrlResponseHeaderInfo *response() const { return m_response; }
        void setResponse(MWebCoreUrlResponseHeaderInfo *response);
#else
#if APPLE_CHANGES
        NSURLResponse *response() const { return m_response; }
        void setResponse(NSURLResponse *response);

        NSData *allData() const { return m_allData; }
        void setAllData (NSData *data);
#endif
#endif

        bool canDelete() const { return (m_clients.count() == 0 && !m_request); }

	void setExpireDate(time_t _expireDate, bool changeHttpCache);

	bool isExpired() const;

        virtual bool schedule() const { return false; }

        /**
         * List of acceptable mimetypes seperated by ",". A mimetype may contain a wildcard.
         */
        // e.g. "text/*"
        QString accept() const { return m_accept; }
        void setAccept(const QString &_accept) { m_accept = _accept; }

    protected:
        void setSize(int size);

        QPtrDict<CachedObjectClient> m_clients;

	DOM::DOMString m_url;
        QString m_accept;
        Request *m_request;
#if NOKIA_CHANGES
        MWebCoreUrlResponseHeaderInfo *m_response;
#else
#if APPLE_CHANGES
        NSURLResponse *m_response;
        NSData *m_allData;
#endif
#endif
	Type m_type;
	Status m_status;
    private:
	int m_size;
    int m_accessCount;

    protected:
	time_t m_expireDate;
	KIO::CacheControl m_cachePolicy;
        bool m_free : 1;
        bool m_deleted : 1;
        bool m_loading : 1;
        bool m_expireDateChanged : 1;

    private:
        bool allowInLRUList() { return canDelete() && status() != Persistent; }

        CachedObject *m_nextInLRUList;
        CachedObject *m_prevInLRUList;
        friend class Cache;
    };


    /**
     * a cached style sheet
     */
    class CachedCSSStyleSheet : public CachedObject
    {
    public:
	CachedCSSStyleSheet(DocLoader* dl, const DOM::DOMString &url, KIO::CacheControl cachePolicy, time_t _expireDate, const QString& charset);
	CachedCSSStyleSheet(const DOM::DOMString &url, const QString &stylesheet_data);
	virtual ~CachedCSSStyleSheet();

#if NOKIA_CHANGES
    const DOM::DOMString sheet() const;
#else
	const DOM::DOMString &sheet() const { return m_sheet; }
#endif
	virtual void ref(CachedObjectClient *consumer);
	virtual void deref(CachedObjectClient *consumer);

	virtual void data( QBuffer &buffer, bool eof );
	virtual void error( int err, const char *text );

        virtual bool schedule() const { return true; }

	void checkNotify();

    protected:
#if NOKIA_CHANGES
        QString m_stringData;
        QByteArray m_data;
#else
        DOM::DOMString m_sheet;
#endif
        QTextCodec* m_codec;
    };

    /**
     * a cached script
     */
    class CachedScript : public CachedObject
    {
    public:
	CachedScript(DocLoader* dl, const DOM::DOMString &url, KIO::CacheControl cachePolicy, time_t _expireDate, const QString& charset);
	CachedScript(const DOM::DOMString &url, const QString &script_data);
	virtual ~CachedScript();

#if NOKIA_CHANGES
    const DOM::DOMString script() const;
#else
	const DOM::DOMString &script() const { return m_script; }
#endif
	virtual void ref(CachedObjectClient *consumer);
	virtual void deref(CachedObjectClient *consumer);

	virtual void data( QBuffer &buffer, bool eof );
	virtual void error( int err, const char *text );

        virtual bool schedule() const { return false; }

	void checkNotify();

        bool isLoaded() const { return !m_loading; }

    protected:
#if NOKIA_CHANGES
        QString m_stringData;
        QByteArray m_data;
#else
        DOM::DOMString m_script;
#endif
        QTextCodec* m_codec;
    };

    class ImageSource;

#if APPLE_CHANGES
    class CachedImage;

    class CachedImageCallback
    {
    public:
        CachedImageCallback (CachedImage *c) : cachedImage(c), refCount(1), headerReceived(false) {};

        void ref() { refCount++; }
        void deref() { if (--refCount == 0) delete this; }

        void notifyUpdate();
        void notifyFinished();
        void notifyDecodingError();
        void clear();
        void handleError();

    private:
        CachedImage *cachedImage;
        uint refCount;
	bool headerReceived;
    };
#endif

    /**
     * a cached image
     */
    class CachedImage : public QObject, public CachedObject
    {
	Q_OBJECT
    public:
	CachedImage(DocLoader* dl, const DOM::DOMString &url, KIO::CacheControl cachePolicy, time_t _expireDate);
	virtual ~CachedImage();

	const QPixmap &pixmap() const;
	const QPixmap &tiled_pixmap(const QColor& bg);

        QSize pixmap_size() const;    // returns the size of the complete (i.e. when finished) loading
        QRect valid_rect() const;     // returns the rectangle of pixmap that has been loaded already

        void ref(CachedObjectClient *consumer);
	virtual void deref(CachedObjectClient *consumer);

	virtual void data( QBuffer &buffer, bool eof );
	virtual void error( int err, const char *text );

        bool isTransparent() const { return isFullyTransparent; }
#if NOKIA_CHANGES
        bool isErrorImage() const { return errorOccured || (!p && !m_loading); }
#else
        bool isErrorImage() const { return errorOccured; }
#endif
        void setShowAnimations( KHTMLSettings::KAnimationAdvice );

        virtual bool schedule() const { return true; }