[162] | 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: 1.1 $ |
---|
| 22 | // Revision_date : $Date: 2004/02/16 14:46:00 $ |
---|
| 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 | #include <zlib.h> |
---|
| 33 | |
---|
| 34 | // standard C++ with new header file names and std:: namespace |
---|
| 35 | #include <iostream> |
---|
| 36 | #include <fstream> |
---|
| 37 | using namespace std; |
---|
| 38 | |
---|
| 39 | #ifdef GZSTREAM_NAMESPACE |
---|
| 40 | namespace GZSTREAM_NAMESPACE { |
---|
| 41 | #endif |
---|
| 42 | |
---|
| 43 | // ---------------------------------------------------------------------------- |
---|
| 44 | // Internal classes to implement gzstream. See below for user classes. |
---|
| 45 | // ---------------------------------------------------------------------------- |
---|
| 46 | |
---|
| 47 | // size of data buff |
---|
| 48 | #define gzbufferSize 303 |
---|
| 49 | |
---|
| 50 | |
---|
| 51 | |
---|
| 52 | // #define STREAMBUF std::streambuf |
---|
| 53 | // #define ISTREAM std::istream |
---|
| 54 | // #define OSTREAM std::ostream |
---|
| 55 | |
---|
| 56 | #define STREAMBUF streambuf |
---|
| 57 | #define ISTREAM istream |
---|
| 58 | #define OSTREAM ostream |
---|
| 59 | |
---|
| 60 | class gzstreambuf : public STREAMBUF { |
---|
| 61 | |
---|
| 62 | private: |
---|
| 63 | // totals 512 bytes under g++ for igzstream at the end. |
---|
| 64 | |
---|
| 65 | gzFile file; // file handle for compressed file |
---|
| 66 | char buffer[gzbufferSize]; // data buffer |
---|
| 67 | char opened; // open/close state of stream |
---|
| 68 | int mode; // I/O mode |
---|
| 69 | |
---|
| 70 | int flush_buffer(); |
---|
| 71 | public: |
---|
| 72 | gzstreambuf() : opened(0) { |
---|
| 73 | setp( buffer, buffer + (gzbufferSize-1)); |
---|
| 74 | setg( buffer + 4, // beginning of putback area |
---|
| 75 | buffer + 4, // read position |
---|
| 76 | buffer + 4); // end position |
---|
| 77 | // ASSERT: both input & output capabilities will not be used together |
---|
| 78 | } |
---|
| 79 | int is_open() { return opened; } |
---|
| 80 | gzstreambuf* open( const char* name, int open_mode); |
---|
| 81 | gzstreambuf* close(); |
---|
| 82 | ~gzstreambuf() { close(); } |
---|
| 83 | |
---|
| 84 | virtual int overflow( int c = EOF); |
---|
| 85 | virtual int underflow(); |
---|
| 86 | virtual int sync(); |
---|
| 87 | |
---|
| 88 | }; |
---|
| 89 | |
---|
| 90 | class gzstreambase : virtual public ios { |
---|
| 91 | |
---|
| 92 | protected: |
---|
| 93 | gzstreambuf buf; |
---|
| 94 | public: |
---|
| 95 | gzstreambase() { init(&buf); } |
---|
| 96 | gzstreambase( const char* name, int open_mode); |
---|
| 97 | ~gzstreambase(); |
---|
| 98 | void open( const char* name, int open_mode); |
---|
| 99 | void close(); |
---|
| 100 | gzstreambuf* rdbuf() { return &buf; } |
---|
| 101 | }; |
---|
| 102 | |
---|
| 103 | // ---------------------------------------------------------------------------- |
---|
| 104 | // User classes. Use igzstream and ogzstream analogously to ifstream and |
---|
| 105 | // ofstream respectively. They read and write files based on the gz* |
---|
| 106 | // function interface of the zlib. Files are compatible with gzip compression. |
---|
| 107 | // ---------------------------------------------------------------------------- |
---|
| 108 | |
---|
| 109 | |
---|
| 110 | |
---|
| 111 | class igzstream : public gzstreambase, public ISTREAM { |
---|
| 112 | |
---|
| 113 | public: |
---|
| 114 | igzstream() : gzstreambase(), ISTREAM( &buf ) {} |
---|
| 115 | |
---|
| 116 | igzstream( const char* name, int open_mode = std::ios::in) |
---|
| 117 | : gzstreambase( name, open_mode), ISTREAM( &buf) {} |
---|
| 118 | |
---|
| 119 | gzstreambuf* rdbuf() { return gzstreambase::rdbuf(); } |
---|
| 120 | |
---|
| 121 | void open( const char* name, int open_mode = std::ios::in) { |
---|
| 122 | gzstreambase::open( name, open_mode); |
---|
| 123 | } |
---|
| 124 | }; |
---|
| 125 | |
---|
| 126 | class ogzstream : public gzstreambase, public OSTREAM { |
---|
| 127 | |
---|
| 128 | public: |
---|
| 129 | ogzstream() : OSTREAM( &buf) {} |
---|
| 130 | ogzstream( const char* name, int mode = std::ios::out) |
---|
| 131 | : gzstreambase( name, mode), OSTREAM( &buf) {} |
---|
| 132 | gzstreambuf* rdbuf() { return gzstreambase::rdbuf(); } |
---|
| 133 | void open( const char* name, int open_mode = std::ios::out) { |
---|
| 134 | gzstreambase::open( name, open_mode); |
---|
| 135 | } |
---|
| 136 | |
---|
| 137 | }; |
---|
| 138 | |
---|
| 139 | #ifdef GZSTREAM_NAMESPACE |
---|
| 140 | } // namespace GZSTREAM_NAMESPACE |
---|
| 141 | #endif |
---|
| 142 | |
---|
| 143 | #endif // GZSTREAM_H |
---|
| 144 | // ============================================================================ |
---|
| 145 | // EOF // |
---|
| 146 | |
---|