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comparison BEDTools-Version-2.14.3/src/utils/gzstream/gzstream.C @ 0:dfcd8b6c1bda

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author aaronquinlan
date Thu, 03 Nov 2011 10:25:04 -0400
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1 // ============================================================================
2 // gzstream, C++ iostream classes wrapping the zlib compression library.
3 // Copyright (C) 2001 Deepak Bandyopadhyay, Lutz Kettner
4 //
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.
9 //
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.
14 //
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 // ============================================================================
19 //
20 // File : gzstream.C
21 // Revision : $Revision: 1.7 $
22 // Revision_date : $Date: 2003/01/08 14:41:27 $
23 // Author(s) : Deepak Bandyopadhyay, Lutz Kettner
24 //
25 // Standard streambuf implementation following Nicolai Josuttis, "The
26 // Standard C++ Library".
27 // ============================================================================
28
29 #include <gzstream.h>
30 #include <iostream>
31 #include <string.h> // for memcpy
32
33 #ifdef GZSTREAM_NAMESPACE
34 namespace GZSTREAM_NAMESPACE {
35 #endif
36
37 // ----------------------------------------------------------------------------
38 // Internal classes to implement gzstream. See header file for user classes.
39 // ----------------------------------------------------------------------------
40
41 // --------------------------------------
42 // class gzstreambuf:
43 // --------------------------------------
44
45 gzstreambuf* gzstreambuf::open( const char* name, int open_mode) {
46 if ( is_open())
47 return (gzstreambuf*)0;
48 mode = open_mode;
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;
53 char fmode[10];
54 char* fmodeptr = fmode;
55 if ( mode & std::ios::in)
56 *fmodeptr++ = 'r';
57 else if ( mode & std::ios::out)
58 *fmodeptr++ = 'w';
59 *fmodeptr++ = 'b';
60 *fmodeptr = '\0';
61 file = gzopen( name, fmode);
62 if (file == 0)
63 return (gzstreambuf*)0;
64 opened = 1;
65 return this;
66 }
67
68 gzstreambuf * gzstreambuf::close() {
69 if ( is_open()) {
70 sync();
71 opened = 0;
72 if ( gzclose( file) == Z_OK)
73 return this;
74 }
75 return (gzstreambuf*)0;
76 }
77
78 int gzstreambuf::underflow() { // used for input buffer only
79 if ( gptr() && ( gptr() < egptr()))
80 return * reinterpret_cast<unsigned char *>( gptr());
81
82 if ( ! (mode & std::ios::in) || ! opened)
83 return EOF;
84 // Josuttis' implementation of inbuf
85 int n_putback = gptr() - eback();
86 if ( n_putback > 4)
87 n_putback = 4;
88 memcpy( buffer + (4 - n_putback), gptr() - n_putback, n_putback);
89
90 int num = gzread( file, buffer+4, bufferSize-4);
91 if (num <= 0) // ERROR or EOF
92 return EOF;
93
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
98
99 // return next character
100 return * reinterpret_cast<unsigned char *>( gptr());
101 }
102
103 int gzstreambuf::flush_buffer() {
104 // Separate the writing of the buffer from overflow() and
105 // sync() operation.
106 int w = pptr() - pbase();
107 if ( gzwrite( file, pbase(), w) != w)
108 return EOF;
109 pbump( -w);
110 return w;
111 }
112
113 int gzstreambuf::overflow( int c) { // used for output buffer only
114 if ( ! ( mode & std::ios::out) || ! opened)
115 return EOF;
116 if (c != EOF) {
117 *pptr() = c;
118 pbump(1);
119 }
120 if ( flush_buffer() == EOF)
121 return EOF;
122 return c;
123 }
124
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)
131 return -1;
132 }
133 return 0;
134 }
135
136 // --------------------------------------
137 // class gzstreambase:
138 // --------------------------------------
139
140 gzstreambase::gzstreambase( const char* name, int mode) {
141 init( &buf);
142 open( name, mode);
143 }
144
145 gzstreambase::~gzstreambase() {
146 buf.close();
147 }
148
149 void gzstreambase::open( const char* name, int open_mode) {
150 if ( ! buf.open( name, open_mode))
151 clear( rdstate() | std::ios::badbit);
152 }
153
154 void gzstreambase::close() {
155 if ( buf.is_open())
156 if ( ! buf.close())
157 clear( rdstate() | std::ios::badbit);
158 }
159
160 #ifdef GZSTREAM_NAMESPACE
161 } // namespace GZSTREAM_NAMESPACE
162 #endif
163
164 // ============================================================================
165 // EOF //