ThingWorx C SDK
zfstream.h
1 
2 #ifndef zfstream_h
3 #define zfstream_h
4 
5 #include <fstream.h>
6 #include "zlib.h"
7 
8 class gzfilebuf : public streambuf {
9 
10 public:
11 
12  gzfilebuf( );
13  virtual ~gzfilebuf();
14 
15  gzfilebuf *open( const char *name, int io_mode );
16  gzfilebuf *attach( int file_descriptor, int io_mode );
17  gzfilebuf *close();
18 
19  int setcompressionlevel( int comp_level );
20  int setcompressionstrategy( int comp_strategy );
21 
22  inline int is_open() const { return (file !=NULL); }
23 
24  virtual streampos seekoff( streamoff, ios::seek_dir, int );
25 
26  virtual int sync();
27 
28 protected:
29 
30  virtual int underflow();
31  virtual int overflow( int = EOF );
32 
33 private:
34 
35  gzFile file;
36  short mode;
37  short own_file_descriptor;
38 
39  int flushbuf();
40  int fillbuf();
41 
42 };
43 
44 class gzfilestream_common : virtual public ios {
45 
46  friend class gzifstream;
47  friend class gzofstream;
48  friend gzofstream &setcompressionlevel( gzofstream &, int );
49  friend gzofstream &setcompressionstrategy( gzofstream &, int );
50 
51 public:
52  virtual ~gzfilestream_common();
53 
54  void attach( int fd, int io_mode );
55  void open( const char *name, int io_mode );
56  void close();
57 
58 protected:
60 
61 private:
62  gzfilebuf *rdbuf();
63 
64  gzfilebuf buffer;
65 
66 };
67 
68 class gzifstream : public gzfilestream_common, public istream {
69 
70 public:
71 
72  gzifstream();
73  gzifstream( const char *name, int io_mode = ios::in );
74  gzifstream( int fd, int io_mode = ios::in );
75 
76  virtual ~gzifstream();
77 
78 };
79 
80 class gzofstream : public gzfilestream_common, public ostream {
81 
82 public:
83 
84  gzofstream();
85  gzofstream( const char *name, int io_mode = ios::out );
86  gzofstream( int fd, int io_mode = ios::out );
87 
88  virtual ~gzofstream();
89 
90 };
91 
92 template<class T> class gzomanip {
93  friend gzofstream &operator<<(gzofstream &, const gzomanip<T> &);
94 public:
95  gzomanip(gzofstream &(*f)(gzofstream &, T), T v) : func(f), val(v) { }
96 private:
97  gzofstream &(*func)(gzofstream &, T);
98  T val;
99 };
100 
101 template<class T> gzofstream &operator<<(gzofstream &s, const gzomanip<T> &m)
102 {
103  return (*m.func)(s, m.val);
104 }
105 
106 inline gzofstream &setcompressionlevel( gzofstream &s, int l )
107 {
108  (s.rdbuf())->setcompressionlevel(l);
109  return s;
110 }
111 
112 inline gzofstream &setcompressionstrategy( gzofstream &s, int l )
113 {
114  (s.rdbuf())->setcompressionstrategy(l);
115  return s;
116 }
117 
118 inline gzomanip<int> setcompressionlevel(int l)
119 {
120  return gzomanip<int>(&setcompressionlevel,l);
121 }
122 
123 inline gzomanip<int> setcompressionstrategy(int l)
124 {
125  return gzomanip<int>(&setcompressionstrategy,l);
126 }
127 
128 #endif
void attach(int fd, std::ios_base::openmode mode=std::ios_base::out)
Attach to already open gzipped file.
Definition: zfstream.cc:464
Gzipped file output stream class.
Definition: zfstream.h:80
gzfilebuf * rdbuf() const
Definition: zfstream.h:351
Gzipped file stream buffer class.
Definition: zfstream.h:8
void open(const char *name, std::ios_base::openmode mode=std::ios_base::out)
Open gzipped file.
Definition: zfstream.cc:453
void close()
Close gzipped file.
Definition: zfstream.cc:475
Definition: zfstream.h:92
Definition: zfstream.h:44
Gzipped file input stream class.
Definition: zfstream.h:68
Definition: zlib.h:1817
Definition: gzappend.c:170