kqiodevicegzip_p.cpp
/* This file is part of the KDE project
Copyright (C) 2001,2005 Nicolas GOUTTE <nicog@snafu.de>
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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
// TODO: more error report and control
#include <qstring.h>
#include "kqiodevicegzip_p.h"
KQIODeviceGZip::KQIODeviceGZip(const QString& filename)
{
m_gzfile=0;
m_ungetchar=-1;
m_filename=filename;
setFlags(IO_Sequential); // We have no direct access, so it is sequential!
// NOTE: "sequential" also means that you cannot use size()
}
KQIODeviceGZip::~KQIODeviceGZip(void)
{
if (m_gzfile)
close();
}
bool KQIODeviceGZip::open(int mode)
{
if (m_gzfile)
close(); // One file is already open, so close it first.
if (m_filename.isEmpty())
return false; // No file name, cannot open!
if (IO_ReadOnly==mode)
{
m_gzfile=gzopen(QFile::encodeName(m_filename),"rb");
}
else if (IO_WriteOnly==mode)
{
m_gzfile=gzopen(QFile::encodeName(m_filename),"wb9"); // Always set best compression
}
else
{
// We only support read only or write only, nothing else!
return false;
}
return (m_gzfile!=0);
}
void KQIODeviceGZip::close(void)
{
if (m_gzfile)
{
gzclose(m_gzfile);
m_gzfile=0;
}
}
void KQIODeviceGZip::flush(void)
{
// Always try to flush, do not return any error!
if (m_gzfile)
{
gzflush(m_gzfile,Z_SYNC_FLUSH);
}
}
QIODevice::Offset KQIODeviceGZip::size(void) const
{
return 0; // You cannot determine size!
}
QIODevice::Offset KQIODeviceGZip::at() const
{
if (!m_gzfile)
return 0;
return gztell(m_gzfile);
}
bool KQIODeviceGZip::at(QIODevice::Offset pos)
{
if (!m_gzfile)
return false;
return (gzseek(m_gzfile,pos,SEEK_SET)>=0);
}
bool KQIODeviceGZip::atEnd() const
{
if (!m_gzfile)
return true;
return gzeof(m_gzfile);
}
bool KQIODeviceGZip::reset(void)
{
if (!m_gzfile)
return false; //Say we arew at end of file
return (gzrewind(m_gzfile)>=0);
}
Q_LONG KQIODeviceGZip::readBlock( char *data, Q_ULONG maxlen )
{
Q_LONG result=0;
if (m_gzfile)
{
result=gzread(m_gzfile,data,maxlen);
if (result<0) result=0;
}
return result;
}
Q_LONG KQIODeviceGZip::writeBlock( const char *data, Q_ULONG len )
{
Q_ULONG result=0;
if (m_gzfile)
{
result=gzwrite(m_gzfile,(char*)data,len);
}
return result;
}
int KQIODeviceGZip::getch()
{
if (m_ungetchar>0)
{
const int ch=m_ungetchar;
m_ungetchar=-1;
return ch;
}
if (!m_gzfile)
return -1;
return gzgetc(m_gzfile);
}
int KQIODeviceGZip::putch( int ch)
{
if (!m_gzfile)
return -1;
return gzputc(m_gzfile,ch);
}
int KQIODeviceGZip::ungetch(int ch)
{
m_ungetchar=ch;
return ch;
}
flush
kndbgstream & flush(kndbgstream &s)
Does nothing.
Definition: kdebug.h:589
KStdAction::close
KAction * close(const QObject *recvr, const char *slot, KActionCollection *parent, const char *name=0)

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