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/* This file is part of the KDE libraries
Copyright (C) 2000 David Faure <[email protected]>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef __kfilterdev_h
#define __kfilterdev_h
#include <tqiodevice.h>
#include <tqstring.h>
#include <kdelibs_export.h>
class TQFile;
class KFilterBase;
/**
* A class for reading and writing compressed data onto a device
* (e.g. file, but other usages are possible, like a buffer or a socket).
*
* To simply read/write compressed files, see deviceForFile.
*
* @author David Faure <[email protected]>
*/
class KIO_EXPORT KFilterDev : public TQIODevice
{
public:
/**
* Constructs a KFilterDev for a given filter (e.g. gzip, bzip2 etc.).
* @param filter the KFilterBase to use
* @param autoDeleteFilterBase when true this object will become the
* owner of @p filter.
*/
KFilterDev( KFilterBase * filter, bool autoDeleteFilterBase = false );
/**
* Destructs the KFilterDev.
* Calls close() if the filter device is still open.
*/
virtual ~KFilterDev();
/**
* Open for reading or writing.
* If the KFilterBase's device is not opened, it will be opened.
*/
#ifdef qdoc
#else
virtual bool open( TQ_OpenMode mode );
#endif
/**
* Close after reading or writing.
* If the KFilterBase's device was opened by open(), it will be closed.
*/
virtual void close();
virtual void flush();
/**
* For writing gzip compressed files only:
* set the name of the original file, to be used in the gzip header.
* @param fileName the name of the original file
*/
void setOrigFileName( const TQCString & fileName );
/**
* Call this let this device skip the gzip headers when reading/writing.
* This way KFilterDev (with gzip filter) can be used as a direct wrapper
* around zlib - this is used by KZip.
* @since 3.1
*/
void setSkipHeaders();
// Not implemented
#ifdef qdoc
#else
#ifdef USE_QT4
virtual qint64 size() const;
#else // USE_QT4
virtual TQIODevice::Offset size() const;
#endif // USE_QT4
#endif
virtual TQIODevice::Offset at() const;
/**
* That one can be quite slow, when going back. Use with care.
*/
virtual bool at( TQIODevice::Offset );
virtual bool atEnd() const;
#ifdef qdoc
#else
virtual TQT_TQIO_LONG tqreadBlock( char *data, TQT_TQIO_ULONG maxlen );
virtual TQT_TQIO_LONG tqwriteBlock( const char *data, TQT_TQIO_ULONG len );
#endif
//int readLine( char *data, uint maxlen );
virtual int getch();
virtual int putch( int );
virtual int ungetch( int );
#ifdef KDE_NO_COMPAT
private:
#endif
/**
* Call this to create the appropriate filter device for @p base
* working on @p file . The returned TQIODevice has to be deleted
* after using.
* @deprecated. Use deviceForFile instead.
* To be removed in KDE 3.0
*/
static TQIODevice* createFilterDevice(KFilterBase* base, TQFile* file) KDE_DEPRECATED;
public:
/**
* Creates an i/o device that is able to read from @p fileName,
* whether it's compressed or not. Available compression filters
* (gzip/bzip2 etc.) will automatically be used.
*
* The compression filter to be used is determined from the @p fileName
* if @p mimetype is empty. Pass "application/x-gzip" or "application/x-bzip2"
* to force the corresponding decompression filter, if available.
*
* Warning: application/x-bzip2 may not be available.
* In that case a TQFile opened on the compressed data will be returned !
* Use KFilterBase::findFilterByMimeType and code similar to what
* deviceForFile is doing, to better control what's happening.
*
* The returned TQIODevice has to be deleted after using.
*
* @param fileName the name of the file to filter
* @param mimetype the mime type of the file to filter, or TQString::null if unknown
* @param forceFilter if true, the function will either find a compression filter, or return 0.
* If false, it will always return a TQIODevice. If no
* filter is available it will return a simple TQFile.
* This can be useful if the file is usable without a filter.
* @return if a filter has been found, the TQIODevice for the filter. If the
* filter does not exist, the return value depends on @p forceFilter.
* The returned TQIODevice has to be deleted after using.
*/
static TQIODevice * deviceForFile( const TQString & fileName, const TQString & mimetype = TQString::null,
bool forceFilter = false );
/**
* Creates an i/o device that is able to read from the TQIODevice @p inDevice,
* whether the data is compressed or not. Available compression filters
* (gzip/bzip2 etc.) will automatically be used.
*
* The compression filter to be used is determined @p mimetype .
* Pass "application/x-gzip" or "application/x-bzip2"
* to use the corresponding decompression filter.
*
* Warning: application/x-bzip2 may not be available.
* In that case 0 will be returned !
*
* The returned TQIODevice has to be deleted after using.
* @param inDevice input device, becomes owned by this device! Automatically deleted!
* @param mimetype the mime type for the filter
* @return a TQIODevice that filters the original stream. Must be deleted after
* using
*/
static TQIODevice * device( TQIODevice* inDevice, const TQString & mimetype);
// BIC: merge with device() method below, using default value for autoDeleteInDevice
/**
* Creates an i/o device that is able to read from the TQIODevice @p inDevice,
* whether the data is compressed or not. Available compression filters
* (gzip/bzip2 etc.) will automatically be used.
*
* The compression filter to be used is determined @p mimetype .
* Pass "application/x-gzip" or "application/x-bzip2"
* to use the corresponding decompression filter.
*
* Warning: application/x-bzip2 may not be available.
* In that case 0 will be returned !
*
* The returned TQIODevice has to be deleted after using.
* @param inDevice input device. Won't be deleted if @p autoDeleteInDevice = false
* @param mimetype the mime type for the filter
* @param autoDeleteInDevice if true, @p inDevice will be deleted automatically
* @return a TQIODevice that filters the original stream. Must be deleted after
* using
* @since 3.1
*/
static TQIODevice * device( TQIODevice* inDevice, const TQString & mimetype, bool autoDeleteInDevice );
private:
KFilterBase *filter;
class KFilterDevPrivate;
KFilterDevPrivate * d;
};
#endif
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