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 <qstring.h>
00023 #include "kqiodevicegzip_p.h"
00024 
00025 KQIODeviceGZip::KQIODeviceGZip(const QString& 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(int 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(QFile::encodeName(m_filename),"rb");
00050     }
00051     else if (IO_WriteOnly==mode)
00052     {
00053         m_gzfile=gzopen(QFile::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 QIODevice::Offset KQIODeviceGZip::size(void) const
00082 {
00083     return 0; // You cannot determine size!
00084 }
00085 
00086 QIODevice::Offset  KQIODeviceGZip::at() const
00087 {
00088     if (!m_gzfile)
00089         return 0;
00090     return gztell(m_gzfile);
00091 }
00092 
00093 bool KQIODeviceGZip::at(QIODevice::Offset pos)
00094 {
00095     if (!m_gzfile)
00096         return false;
00097     return (gzseek(m_gzfile,pos,SEEK_SET)>=0);
00098 }
00099 
00100 bool KQIODeviceGZip::atEnd() const
00101 {
00102     if (!m_gzfile)
00103         return true;
00104     return gzeof(m_gzfile);
00105 }
00106 
00107 bool KQIODeviceGZip::reset(void)
00108 {
00109     if (!m_gzfile)
00110         return false; //Say we arew at end of file
00111     return (gzrewind(m_gzfile)>=0);
00112 }
00113 
00114 Q_LONG KQIODeviceGZip::readBlock( char *data, Q_ULONG maxlen )
00115 {
00116     Q_LONG result=0;
00117     if (m_gzfile)
00118     {
00119         result=gzread(m_gzfile,data,maxlen);
00120         if (result<0) result=0;
00121     }
00122     return result;
00123 }
00124 
00125 Q_LONG KQIODeviceGZip::writeBlock( const char *data, Q_ULONG len )
00126 {
00127     Q_ULONG result=0;
00128     if (m_gzfile)
00129     {
00130         result=gzwrite(m_gzfile,(char*)data,len);
00131     }
00132     return result;
00133 }
00134 
00135 int KQIODeviceGZip::getch()
00136 {
00137     if (m_ungetchar>0)
00138     {
00139         const int ch=m_ungetchar;
00140         m_ungetchar=-1;
00141         return ch;
00142     }
00143     if (!m_gzfile)
00144         return -1;
00145     return gzgetc(m_gzfile);
00146 }
00147 
00148 int KQIODeviceGZip::putch( int ch)
00149 {
00150     if (!m_gzfile)
00151         return -1;
00152     return gzputc(m_gzfile,ch);
00153 }
00154 
00155 int KQIODeviceGZip::ungetch(int ch)
00156 {
00157     m_ungetchar=ch;
00158     return ch;
00159 }
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