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comparison BEDTools-Version-2.14.3/src/utils/gzstream/gzstream.h @ 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.h
21 // Revision : $Revision: 1.5 $
22 // Revision_date : $Date: 2002/04/26 23:30:15 $
23 // Author(s) : Deepak Bandyopadhyay, Lutz Kettner
24 //
25 // Standard streambuf implementation following Nicolai Josuttis, "The
26 // Standard C++ Library".
27 // ============================================================================
28
29 #ifndef GZSTREAM_H
30 #define GZSTREAM_H 1
31
32 // standard C++ with new header file names and std:: namespace
33 #include <iostream>
34 #include <fstream>
35 #include <zlib.h>
36
37 #ifdef GZSTREAM_NAMESPACE
38 namespace GZSTREAM_NAMESPACE {
39 #endif
40
41 // ----------------------------------------------------------------------------
42 // Internal classes to implement gzstream. See below for user classes.
43 // ----------------------------------------------------------------------------
44
45 class gzstreambuf : public std::streambuf {
46 private:
47 static const int bufferSize = 47+256; // size of data buff
48 // totals 512 bytes under g++ for igzstream at the end.
49
50 gzFile file; // file handle for compressed file
51 char buffer[bufferSize]; // data buffer
52 char opened; // open/close state of stream
53 int mode; // I/O mode
54
55 int flush_buffer();
56 public:
57 gzstreambuf() : opened(0) {
58 setp( buffer, buffer + (bufferSize-1));
59 setg( buffer + 4, // beginning of putback area
60 buffer + 4, // read position
61 buffer + 4); // end position
62 // ASSERT: both input & output capabilities will not be used together
63 }
64 int is_open() { return opened; }
65 gzstreambuf* open( const char* name, int open_mode);
66 gzstreambuf* close();
67 ~gzstreambuf() { close(); }
68
69 virtual int overflow( int c = EOF);
70 virtual int underflow();
71 virtual int sync();
72 };
73
74 class gzstreambase : virtual public std::ios {
75 protected:
76 gzstreambuf buf;
77 public:
78 gzstreambase() { init(&buf); }
79 gzstreambase( const char* name, int open_mode);
80 ~gzstreambase();
81 void open( const char* name, int open_mode);
82 void close();
83 gzstreambuf* rdbuf() { return &buf; }
84 };
85
86 // ----------------------------------------------------------------------------
87 // User classes. Use igzstream and ogzstream analogously to ifstream and
88 // ofstream respectively. They read and write files based on the gz*
89 // function interface of the zlib. Files are compatible with gzip compression.
90 // ----------------------------------------------------------------------------
91
92 class igzstream : public gzstreambase, public std::istream {
93 public:
94 igzstream() : std::istream( &buf) {}
95 igzstream( const char* name, int open_mode = std::ios::in)
96 : gzstreambase( name, open_mode), std::istream( &buf) {}
97 gzstreambuf* rdbuf() { return gzstreambase::rdbuf(); }
98 void open( const char* name, int open_mode = std::ios::in) {
99 gzstreambase::open( name, open_mode);
100 }
101 };
102
103 class ogzstream : public gzstreambase, public std::ostream {
104 public:
105 ogzstream() : std::ostream( &buf) {}
106 ogzstream( const char* name, int mode = std::ios::out)
107 : gzstreambase( name, mode), std::ostream( &buf) {}
108 gzstreambuf* rdbuf() { return gzstreambase::rdbuf(); }
109 void open( const char* name, int open_mode = std::ios::out) {
110 gzstreambase::open( name, open_mode);
111 }
112 };
113
114 #ifdef GZSTREAM_NAMESPACE
115 } // namespace GZSTREAM_NAMESPACE
116 #endif
117
118 #endif // GZSTREAM_H
119 // ============================================================================
120 // EOF //
121