zfstream.h
上传用户:zhongxx05
上传日期:2007-06-06
资源大小:33641k
文件大小:3k
- #ifndef _zfstream_h
- #define _zfstream_h
- #include <fstream.h>
- #include "zlib.h"
- class gzfilebuf : public streambuf {
- public:
- gzfilebuf( );
- virtual ~gzfilebuf();
- gzfilebuf *open( const char *name, int io_mode );
- gzfilebuf *attach( int file_descriptor, int io_mode );
- gzfilebuf *close();
- int setcompressionlevel( short comp_level );
- int setcompressionstrategy( short comp_strategy );
- inline int is_open() const { return (file !=NULL); }
- virtual streampos seekoff( streamoff, ios::seek_dir, int );
- virtual int sync();
- protected:
- virtual int underflow();
- virtual int overflow( int = EOF );
- private:
- gzFile file;
- short mode;
- short own_file_descriptor;
- int flushbuf();
- int fillbuf();
- };
- class gzfilestream_common : virtual public ios {
- friend class gzifstream;
- friend class gzofstream;
- friend gzofstream &setcompressionlevel( gzofstream &, int );
- friend gzofstream &setcompressionstrategy( gzofstream &, int );
- public:
- virtual ~gzfilestream_common();
- void attach( int fd, int io_mode );
- void open( const char *name, int io_mode );
- void close();
- protected:
- gzfilestream_common();
- private:
- gzfilebuf *rdbuf();
- gzfilebuf buffer;
- };
- class gzifstream : public gzfilestream_common, public istream {
- public:
- gzifstream();
- gzifstream( const char *name, int io_mode = ios::in );
- gzifstream( int fd, int io_mode = ios::in );
- virtual ~gzifstream();
- };
- class gzofstream : public gzfilestream_common, public ostream {
- public:
- gzofstream();
- gzofstream( const char *name, int io_mode = ios::out );
- gzofstream( int fd, int io_mode = ios::out );
- virtual ~gzofstream();
- };
- template<class T> class gzomanip {
- friend gzofstream &operator<<(gzofstream &, const gzomanip<T> &);
- public:
- gzomanip(gzofstream &(*f)(gzofstream &, T), T v) : func(f), val(v) { }
- private:
- gzofstream &(*func)(gzofstream &, T);
- T val;
- };
- template<class T> gzofstream &operator<<(gzofstream &s,
- const gzomanip<T> &m) {
- return (*m.func)(s, m.val);
-
- }
- inline gzofstream &setcompressionlevel( gzofstream &s, int l ) {
- (s.rdbuf())->setcompressionlevel(l);
- return s;
- }
- inline gzofstream &setcompressionstrategy( gzofstream &s, int l ) {
- (s.rdbuf())->setcompressionstrategy(l);
- return s;
- }
- inline gzomanip<int> setcompressionlevel(int l)
- {
- return gzomanip<int>(&setcompressionlevel,l);
- }
- inline gzomanip<int> setcompressionstrategy(int l)
- {
- return gzomanip<int>(&setcompressionstrategy,l);
- }
- #endif