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: 1.4 $
22 // Revision_date : $Date: 2005/04/26 10:30:24 $
23 // Author(s) : Deepak Bandyopadhyay, Lutz Kettner
25 // Standard streambuf implementation following Nicolai Josuttis, "The
26 // Standard C++ Library".
27 // ============================================================================
31 #include "support/gzstream.h"
35 # include <string.h> // for memcpy
38 #ifdef GZSTREAM_NAMESPACE
39 namespace GZSTREAM_NAMESPACE {
42 // ----------------------------------------------------------------------------
43 // Internal classes to implement gzstream. See header file for user classes.
44 // ----------------------------------------------------------------------------
46 // --------------------------------------
48 // --------------------------------------
50 gzstreambuf* gzstreambuf::open( const char* name, int open_mode) {
52 return (gzstreambuf*)0;
54 // no append nor read/write mode
55 if ((mode & std::ios::ate) || (mode & std::ios::app)
56 || ((mode & std::ios::in) && (mode & std::ios::out)))
57 return (gzstreambuf*)0;
59 char* fmodeptr = fmode;
60 if ( mode & std::ios::in)
62 else if ( mode & std::ios::out)
66 file = gzopen( name, fmode);
68 return (gzstreambuf*)0;
73 gzstreambuf * gzstreambuf::close() {
77 if ( gzclose( file) == Z_OK)
80 return (gzstreambuf*)0;
83 int gzstreambuf::underflow() { // used for input buffer only
84 if ( gptr() && ( gptr() < egptr()))
85 return * reinterpret_cast<unsigned char *>( gptr());
87 if ( ! (mode & std::ios::in) || ! opened)
89 // Josuttis' implementation of inbuf
90 int n_putback = gptr() - eback();
93 memcpy( buffer + (4 - n_putback), gptr() - n_putback, n_putback);
95 int num = gzread( file, buffer+4, bufferSize-4);
96 if (num <= 0) // ERROR or EOF
99 // reset buffer pointers
100 setg( buffer + (4 - n_putback), // beginning of putback area
101 buffer + 4, // read position
102 buffer + 4 + num); // end of buffer
104 // return next character
105 return * reinterpret_cast<unsigned char *>( gptr());
108 int gzstreambuf::flush_buffer() {
109 // Separate the writing of the buffer from overflow() and
111 int w = pptr() - pbase();
112 if ( gzwrite( file, pbase(), w) != w)
118 int gzstreambuf::overflow( int c) { // used for output buffer only
119 if ( ! ( mode & std::ios::out) || ! opened)
125 if ( flush_buffer() == EOF)
130 int gzstreambuf::sync() {
131 // Changed to use flush_buffer() instead of overflow( EOF)
132 // which caused improper behavior with std::endl and flush(),
133 // bug reported by Vincent Ricard.
134 if ( pptr() && pptr() > pbase()) {
135 if ( flush_buffer() == EOF)
141 // --------------------------------------
142 // class gzstreambase:
143 // --------------------------------------
145 gzstreambase::gzstreambase( const char* name, int mode) {
150 gzstreambase::~gzstreambase() {
154 void gzstreambase::open( const char* name, int open_mode) {
155 if ( ! buf.open( name, open_mode))
156 clear( rdstate() | std::ios::badbit);
159 void gzstreambase::close() {
162 clear( rdstate() | std::ios::badbit);
165 #ifdef GZSTREAM_NAMESPACE
166 } // namespace GZSTREAM_NAMESPACE
169 // ============================================================================