1 // ============================================================================
2 // gzstream, C++ iostream classes wrapping the zlib compression library.
3 // Copyright (C) 2001 Deepak Bandyopadhyay, Lutz Kettner
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Lesser General Public
7 // License as published by the Free Software Foundation; either
8 // version 2.1 of the License, or (at your option) any later version.
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Lesser General Public License for more details.
15 // You should have received a copy of the GNU Lesser General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 // ============================================================================
21 // Revision : $Revision: 1.7 $
22 // Revision_date : $Date: 2003/01/08 14:41:27 $
23 // Author(s) : Deepak Bandyopadhyay, Lutz Kettner
25 // Standard streambuf implementation following Nicolai Josuttis, "The
26 // Standard C++ Library".
27 // ============================================================================
29 #include <gzstream.hh>
31 #include <string.h> // for memcpy
33 #ifdef GZSTREAM_NAMESPACE
34 namespace GZSTREAM_NAMESPACE
{
37 // ----------------------------------------------------------------------------
38 // Internal classes to implement gzstream. See header file for user classes.
39 // ----------------------------------------------------------------------------
41 // --------------------------------------
43 // --------------------------------------
45 gzstreambuf
* gzstreambuf::open( const char* name
, int open_mode
) {
47 return (gzstreambuf
*)0;
49 // no append nor read/write mode
50 if ((mode
& std::ios::ate
) || (mode
& std::ios::app
)
51 || ((mode
& std::ios::in
) && (mode
& std::ios::out
)))
52 return (gzstreambuf
*)0;
54 char* fmodeptr
= fmode
;
55 if ( mode
& std::ios::in
)
57 else if ( mode
& std::ios::out
)
61 file
= gzopen( name
, fmode
);
63 return (gzstreambuf
*)0;
68 gzstreambuf
* gzstreambuf::close() {
72 if ( gzclose( file
) == Z_OK
)
75 return (gzstreambuf
*)0;
78 int gzstreambuf::underflow() { // used for input buffer only
79 if ( gptr() && ( gptr() < egptr()))
80 return * reinterpret_cast<unsigned char *>( gptr());
82 if ( ! (mode
& std::ios::in
) || ! opened
)
84 // Josuttis' implementation of inbuf
85 int n_putback
= gptr() - eback();
88 memcpy( buffer
+ (4 - n_putback
), gptr() - n_putback
, n_putback
);
90 int num
= gzread( file
, buffer
+4, bufferSize
-4);
91 if (num
<= 0) // ERROR or EOF
94 // reset buffer pointers
95 setg( buffer
+ (4 - n_putback
), // beginning of putback area
96 buffer
+ 4, // read position
97 buffer
+ 4 + num
); // end of buffer
99 // return next character
100 return *reinterpret_cast<unsigned char *>(gptr());
103 int gzstreambuf::flush_buffer() {
104 // Separate the writing of the buffer from overflow() and
106 int w
= pptr() - pbase();
107 if ( gzwrite( file
, pbase(), w
) != w
)
113 int gzstreambuf::overflow( int c
) { // used for output buffer only
114 if ( ! ( mode
& std::ios::out
) || ! opened
)
120 if ( flush_buffer() == EOF
)
125 int gzstreambuf::sync() {
126 // Changed to use flush_buffer() instead of overflow( EOF)
127 // which caused improper behavior with std::endl and flush(),
128 // bug reported by Vincent Ricard.
129 if ( pptr() && pptr() > pbase()) {
130 if ( flush_buffer() == EOF
)
136 // --------------------------------------
137 // class gzstreambase:
138 // --------------------------------------
140 gzstreambase::gzstreambase( const char* name
, int mode
) {
145 gzstreambase::~gzstreambase() {
149 void gzstreambase::open( const char* name
, int open_mode
) {
150 if ( ! buf
.open( name
, open_mode
))
151 clear( rdstate() | std::ios::badbit
);
154 void gzstreambase::close() {
157 clear( rdstate() | std::ios::badbit
);
160 #ifdef GZSTREAM_NAMESPACE
161 } // namespace GZSTREAM_NAMESPACE
164 // ============================================================================