Sockets/MemFile.h

   1 /** \file MemFile.h
   2  **     \date  2005-04-25
   3  **     \author grymse@alhem.net
   4 **/
   5 /*
   6 Copyright (C) 2004-2007  Anders Hedstrom
   7
   8 This library is made available under the terms of the GNU GPL.
   9
  10 If you would like to use this library in a closed-source application,
  11 a separate license agreement is available. For information about
  12 the closed-source license agreement for the C++ sockets library,
  13 please visit http://www.alhem.net/Sockets/license.html and/or
  14 email license@alhem.net.
  15
  16 This program is free software; you can redistribute it and/or
  17 modify it under the terms of the GNU General Public License
  18 as published by the Free Software Foundation; either version 2
  19 of the License, or (at your option) any later version.
  20
  21 This program is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public License
  27 along with this program; if not, write to the Free Software
  28 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  29 */
  30 #ifndef _SOCKETS_MemFile_H
  31 #define _SOCKETS_MemFile_H
  32
  33 #include "sockets-config.h"
  34 #include <map>
  35 #include "IFile.h"
  36
  37 #define BLOCKSIZE 32768
  38
  39 #ifdef SOCKETS_NAMESPACE
  40 namespace SOCKETS_NAMESPACE {
  41 #endif
  42
  43
  44 /** Implements a memory file.
  45         \ingroup file */
  46 class MemFile : public IFile
  47 {
  48 public:
  49         /** File block structure.
  50                 \ingroup file */
  51         struct block_t {
  52                 block_t() : next(NULL) {}
  53                 struct block_t *next;
  54                 char data[BLOCKSIZE];
  55         };
  56 public:
  57         MemFile();
  58         MemFile(const std::string& path);
  59         ~MemFile();
  60
  61         bool fopen(const std::string& path, const std::string& mode);
  62         void fclose();
  63
  64         size_t fread(char *ptr, size_t size, size_t nmemb) const;
  65         size_t fwrite(const char *ptr, size_t size, size_t nmemb);
  66
  67         char *fgets(char *s, int size) const;
  68         void fprintf(const char *format, ...);
  69
  70         off_t size() const;
  71         bool eof() const;
  72
  73         void reset_read() const;
  74         void reset_write();
  75
  76 private:
  77         MemFile(const MemFile& ) {} // copy constructor
  78         MemFile& operator=(const MemFile& ) { return *this; } // assignment operator
  79
  80 static  std::map<std::string,block_t *> m_files;
  81         std::string m_path;
  82         bool m_temporary;
  83         block_t *m_base;
  84         mutable block_t *m_current_read;
  85         block_t *m_current_write;
  86         int m_current_write_nr;
  87         mutable size_t m_read_ptr;
  88         size_t m_write_ptr;
  89         mutable bool m_b_read_caused_eof;
  90 };
  91
  92
  93
  94
  95 #ifdef SOCKETS_NAMESPACE
  96 }
  97 #endif
  98
  99 #endif // _SOCKETS_MemFile_H
 100