OpenMD 3.0
Molecular Dynamics in the Open
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gzstream.hpp
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 : $Revision$
22// Revision_date : $Date$
23// Author(s) : Deepak Bandyopadhyay, Lutz Kettner
24//
25// Standard streambuf implementation following Nicolai Josuttis, "The
26// Standard C++ Library".
27// ============================================================================
28
29#ifndef IO_GZSTREAM_HPP
30#define IO_GZSTREAM_HPP
31
32// standard C++ with new header file names and std:: namespace
33#include <zlib.h>
34
35#include <fstream>
36#include <iostream>
37
38namespace OpenMD {
39
40 // ----------------------------------------------------------------------------
41 // Internal classes to implement gzstream. See below for user classes.
42 // ----------------------------------------------------------------------------
43
44 class gzstreambuf : public std::streambuf {
45 private:
46 static const int bufferSize = 47 + 256; // size of data buff
47 // totals 512 bytes under g++ for igzstream at the end.
48
49 gzFile file; // file handle for compressed file
50 char buffer[bufferSize]; // data buffer
51 char opened; // open/close state of stream
52 int mode; // I/O mode
53
54 int flush_buffer();
55
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
78 public:
79 gzstreambase() { init(&buf); }
80 gzstreambase(const char* name, int open_mode);
82 void open(const char* name, int open_mode);
83 void close();
84 gzstreambuf* rdbuf() { return &buf; }
85 };
86
87 // ----------------------------------------------------------------------------
88 // User classes. Use igzstream and ogzstream analogously to ifstream and
89 // ofstream respectively. They read and write files based on the gz*
90 // function interface of the zlib. Files are compatible with gzip compression.
91 // ----------------------------------------------------------------------------
92
93 class igzstream : public gzstreambase, public std::istream {
94 public:
95 igzstream() : std::istream(&buf) {}
96 igzstream(const char* name, int open_mode = std::ios::in) :
97 gzstreambase(name, open_mode), std::istream(&buf) {}
98 gzstreambuf* rdbuf() { return gzstreambase::rdbuf(); }
99 void open(const char* name, int open_mode = std::ios::in) {
100 gzstreambase::open(name, open_mode);
101 }
102 };
103
104 class ogzstream : public gzstreambase, public std::ostream {
105 public:
106 ogzstream() : std::ostream(&buf) {}
107 ogzstream(const char* name, int mode = std::ios::out) :
108 gzstreambase(name, mode), std::ostream(&buf) {}
109 gzstreambuf* rdbuf() { return gzstreambase::rdbuf(); }
110 void open(const char* name, int open_mode = std::ios::out) {
111 gzstreambase::open(name, open_mode);
112 }
113 };
114} // namespace OpenMD
115
116#endif
This basic Periodic Table class was originally taken from the data.cpp file in OpenBabel.