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kqiodevicegzip_p.cpp
1 /* This file is part of the KDE project
2  Copyright (C) 2001,2005 Nicolas GOUTTE <nicog@snafu.de>
3 
4  This library is free software; you can redistribute it and/or
5  modify it under the terms of the GNU Library General Public
6  License as published by the Free Software Foundation; either
7  version 2 of the License, or (at your option) any later version.
8 
9  This library is distributed in the hope that it will be useful,
10  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  Library General Public License for more details.
13 
14  You should have received a copy of the GNU Library General Public License
15  along with this library; see the file COPYING.LIB. If not, write to
16  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17  Boston, MA 02110-1301, USA.
18 */
19 
20 // TODO: more error report and control
21 
22 #include <tqstring.h>
23 #include "kqiodevicegzip_p.h"
24 
25 KQIODeviceGZip::KQIODeviceGZip(const TQString& filename)
26 {
27  m_gzfile=0;
28  m_ungetchar=-1;
29  m_filename=filename;
30  setFlags(IO_Sequential); // We have no direct access, so it is sequential!
31  // NOTE: "sequential" also means that you cannot use size()
32 }
33 
34 KQIODeviceGZip::~KQIODeviceGZip(void)
35 {
36  if (m_gzfile)
37  close();
38 }
39 
40 bool KQIODeviceGZip::open(int mode)
41 {
42  if (m_gzfile)
43  close(); // One file is already open, so close it first.
44  if (m_filename.isEmpty())
45  return false; // No file name, cannot open!
46 
47  if (IO_ReadOnly==mode)
48  {
49  m_gzfile=gzopen(TQFile::encodeName(m_filename),"rb");
50  }
51  else if (IO_WriteOnly==mode)
52  {
53  m_gzfile=gzopen(TQFile::encodeName(m_filename),"wb9"); // Always set best compression
54  }
55  else
56  {
57  // We only support read only or write only, nothing else!
58  return false;
59  }
60  return (m_gzfile!=0);
61 }
62 
63 void KQIODeviceGZip::close(void)
64 {
65  if (m_gzfile)
66  {
67  gzclose(m_gzfile);
68  m_gzfile=0;
69  }
70 }
71 
72 void KQIODeviceGZip::flush(void)
73 {
74  // Always try to flush, do not return any error!
75  if (m_gzfile)
76  {
77  gzflush(m_gzfile,Z_SYNC_FLUSH);
78  }
79 }
80 
81 TQIODevice::Offset KQIODeviceGZip::size(void) const
82 {
83  return 0; // You cannot determine size!
84 }
85 
86 TQIODevice::Offset KQIODeviceGZip::at() const
87 {
88  if (!m_gzfile)
89  return 0;
90  return gztell(m_gzfile);
91 }
92 
93 bool KQIODeviceGZip::at(TQIODevice::Offset pos)
94 {
95  if (!m_gzfile)
96  return false;
97  return (gzseek(m_gzfile,pos,SEEK_SET)>=0);
98 }
99 
100 bool KQIODeviceGZip::atEnd() const
101 {
102  if (!m_gzfile)
103  return true;
104  return gzeof(m_gzfile);
105 }
106 
107 bool KQIODeviceGZip::reset(void)
108 {
109  if (!m_gzfile)
110  return false; //Say we arew at end of file
111  return (gzrewind(m_gzfile)>=0);
112 }
113 
114 TQ_LONG KQIODeviceGZip::readBlock( char *data, TQ_ULONG maxlen )
115 {
116  TQ_LONG result=0;
117  if (m_gzfile)
118  {
119  result=gzread(m_gzfile,data,maxlen);
120  if (result<0) result=0;
121  }
122  return result;
123 }
124 
125 TQ_LONG KQIODeviceGZip::writeBlock( const char *data, TQ_ULONG len )
126 {
127  TQ_ULONG result=0;
128  if (m_gzfile)
129  {
130  result=gzwrite(m_gzfile,(char*)data,len);
131  }
132  return result;
133 }
134 
135 int KQIODeviceGZip::getch()
136 {
137  if (m_ungetchar>0)
138  {
139  const int ch=m_ungetchar;
140  m_ungetchar=-1;
141  return ch;
142  }
143  if (!m_gzfile)
144  return -1;
145  return gzgetc(m_gzfile);
146 }
147 
148 int KQIODeviceGZip::putch( int ch)
149 {
150  if (!m_gzfile)
151  return -1;
152  return gzputc(m_gzfile,ch);
153 }
154 
155 int KQIODeviceGZip::ungetch(int ch)
156 {
157  m_ungetchar=ch;
158  return ch;
159 }
flush
kndbgstream & flush(kndbgstream &s)
Does nothing.
Definition: kdebug.h:589
KStdAction::close
TDEAction * close(const TQObject *recvr, const char *slot, TDEActionCollection *parent, const char *name=0)

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