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kqiodevicegzip_p.cpp

00001 /* This file is part of the KDE project
00002    Copyright (C) 2001,2005 Nicolas GOUTTE <nicog@snafu.de>
00003 
00004    This library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Library General Public
00006    License as published by the Free Software Foundation; either
00007    version 2 of the License, or (at your option) any later version.
00008 
00009    This library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Library General Public License for more details.
00013 
00014    You should have received a copy of the GNU Library General Public License
00015    along with this library; see the file COPYING.LIB.  If not, write to
00016    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017    Boston, MA 02110-1301, USA.
00018 */
00019 
00020 // TODO: more error report and control
00021 
00022 #include <tqstring.h>
00023 #include "kqiodevicegzip_p.h"
00024 
00025 KQIODeviceGZip::KQIODeviceGZip(const TQString& filename)
00026 {
00027     m_gzfile=0;
00028     m_ungetchar=-1;
00029     m_filename=filename;
00030     setFlags(IO_Sequential); // We have no direct access, so it is sequential!
00031     // NOTE: "sequential" also means that you cannot use size()
00032 }
00033 
00034 KQIODeviceGZip::~KQIODeviceGZip(void)
00035 {
00036     if (m_gzfile)
00037         close();
00038 }
00039 
00040 bool KQIODeviceGZip::open(TQ_OpenMode mode)
00041 {
00042     if (m_gzfile)
00043         close(); // One file is already open, so close it first.
00044     if (m_filename.isEmpty())
00045         return false; // No file name, cannot open!
00046 
00047     if (IO_ReadOnly==mode)
00048     {
00049         m_gzfile=gzopen(TQFile::encodeName(m_filename),"rb");
00050     }
00051     else if (IO_WriteOnly==mode)
00052     {
00053         m_gzfile=gzopen(TQFile::encodeName(m_filename),"wb9"); // Always set best compression
00054     }
00055     else
00056     {
00057         // We only support read only or write only, nothing else!
00058         return false;
00059     }
00060     return (m_gzfile!=0);
00061 }
00062 
00063 void KQIODeviceGZip::close(void)
00064 {
00065     if (m_gzfile)
00066     {
00067         gzclose(m_gzfile);
00068         m_gzfile=0;
00069     }
00070 }
00071 
00072 void KQIODeviceGZip::flush(void)
00073 {
00074     // Always try to flush, do not return any error!
00075     if (m_gzfile)
00076     {
00077         gzflush(m_gzfile,Z_SYNC_FLUSH);
00078     }
00079 }
00080 
00081 #ifdef USE_QT4
00082 qint64 KQIODeviceGZip::size(void) const
00083 #else // USE_QT4
00084 TQIODevice::Offset KQIODeviceGZip::size(void) const
00085 #endif // USE_QT4
00086 {
00087     return 0; // You cannot determine size!
00088 }
00089 
00090 TQIODevice::Offset  KQIODeviceGZip::at() const
00091 {
00092     if (!m_gzfile)
00093         return 0;
00094     return gztell(m_gzfile);
00095 }
00096 
00097 bool KQIODeviceGZip::at(TQIODevice::Offset pos)
00098 {
00099     if (!m_gzfile)
00100         return false;
00101     return (gzseek(m_gzfile,pos,SEEK_SET)>=0);
00102 }
00103 
00104 bool KQIODeviceGZip::atEnd() const
00105 {
00106     if (!m_gzfile)
00107         return true;
00108     return gzeof(m_gzfile);
00109 }
00110 
00111 bool KQIODeviceGZip::reset(void)
00112 {
00113     if (!m_gzfile)
00114         return false; //Say we arew at end of file
00115     return (gzrewind(m_gzfile)>=0);
00116 }
00117 
00118 TQT_TQIO_LONG KQIODeviceGZip::tqreadBlock( char *data, TQT_TQIO_ULONG maxlen )
00119 {
00120     TQ_LONG result=0;
00121     if (m_gzfile)
00122     {
00123         result=gzread(m_gzfile,data,maxlen);
00124         if (result<0) result=0;
00125     }
00126     return result;
00127 }
00128 
00129 TQT_TQIO_LONG KQIODeviceGZip::tqwriteBlock( const char *data, TQT_TQIO_ULONG len )
00130 {
00131     TQ_ULONG result=0;
00132     if (m_gzfile)
00133     {
00134         result=gzwrite(m_gzfile,(char*)data,len);
00135     }
00136     return result;
00137 }
00138 
00139 int KQIODeviceGZip::getch()
00140 {
00141     if (m_ungetchar>0)
00142     {
00143         const int ch=m_ungetchar;
00144         m_ungetchar=-1;
00145         return ch;
00146     }
00147     if (!m_gzfile)
00148         return -1;
00149     return gzgetc(m_gzfile);
00150 }
00151 
00152 int KQIODeviceGZip::putch( int ch)
00153 {
00154     if (!m_gzfile)
00155         return -1;
00156     return gzputc(m_gzfile,ch);
00157 }
00158 
00159 int KQIODeviceGZip::ungetch(int ch)
00160 {
00161     m_ungetchar=ch;
00162     return ch;
00163 }

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