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160 lines
3.5 KiB
160 lines
3.5 KiB
/* This file is part of the KDE project
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Copyright (C) 2001,2005 Nicolas GOUTTE <nicog@snafu.de>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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// TODO: more error report and control
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#include <tqstring.h>
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#include "kqiodevicegzip_p.h"
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KQIODeviceGZip::KQIODeviceGZip(const TQString& filename)
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{
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m_gzfile=0;
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m_ungetchar=-1;
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m_filename=filename;
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setFlags(IO_Sequential); // We have no direct access, so it is sequential!
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// NOTE: "sequential" also means that you cannot use size()
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}
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KQIODeviceGZip::~KQIODeviceGZip(void)
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{
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if (m_gzfile)
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close();
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}
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bool KQIODeviceGZip::open(int mode)
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{
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if (m_gzfile)
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close(); // One file is already open, so close it first.
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if (m_filename.isEmpty())
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return false; // No file name, cannot open!
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if (IO_ReadOnly==mode)
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{
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m_gzfile=gzopen(TQFile::encodeName(m_filename),"rb");
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}
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else if (IO_WriteOnly==mode)
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{
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m_gzfile=gzopen(TQFile::encodeName(m_filename),"wb9"); // Always set best compression
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}
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else
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{
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// We only support read only or write only, nothing else!
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return false;
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}
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return (m_gzfile!=0);
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}
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void KQIODeviceGZip::close(void)
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{
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if (m_gzfile)
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{
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gzclose(m_gzfile);
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m_gzfile=0;
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}
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}
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void KQIODeviceGZip::flush(void)
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{
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// Always try to flush, do not return any error!
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if (m_gzfile)
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{
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gzflush(m_gzfile,Z_SYNC_FLUSH);
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}
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}
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TQIODevice::Offset KQIODeviceGZip::size(void) const
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{
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return 0; // You cannot determine size!
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}
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TQIODevice::Offset KQIODeviceGZip::at() const
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{
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if (!m_gzfile)
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return 0;
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return gztell(m_gzfile);
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}
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bool KQIODeviceGZip::at(TQIODevice::Offset pos)
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{
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if (!m_gzfile)
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return false;
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return (gzseek(m_gzfile,pos,SEEK_SET)>=0);
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}
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bool KQIODeviceGZip::atEnd() const
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{
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if (!m_gzfile)
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return true;
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return gzeof(m_gzfile);
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}
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bool KQIODeviceGZip::reset(void)
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{
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if (!m_gzfile)
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return false; //Say we arew at end of file
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return (gzrewind(m_gzfile)>=0);
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}
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Q_LONG KQIODeviceGZip::readBlock( char *data, Q_ULONG maxlen )
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{
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Q_LONG result=0;
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if (m_gzfile)
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{
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result=gzread(m_gzfile,data,maxlen);
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if (result<0) result=0;
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}
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return result;
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}
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Q_LONG KQIODeviceGZip::writeBlock( const char *data, Q_ULONG len )
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{
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Q_ULONG result=0;
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if (m_gzfile)
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{
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result=gzwrite(m_gzfile,(char*)data,len);
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}
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return result;
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}
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int KQIODeviceGZip::getch()
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{
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if (m_ungetchar>0)
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{
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const int ch=m_ungetchar;
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m_ungetchar=-1;
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return ch;
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}
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if (!m_gzfile)
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return -1;
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return gzgetc(m_gzfile);
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}
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int KQIODeviceGZip::putch( int ch)
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{
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if (!m_gzfile)
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return -1;
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return gzputc(m_gzfile,ch);
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}
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int KQIODeviceGZip::ungetch(int ch)
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{
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m_ungetchar=ch;
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return ch;
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}
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