Disk ARchive  2.4.2
generic_file.hpp
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00001 /*********************************************************************/
00002 // dar - disk archive - a backup/restoration program
00003 // Copyright (C) 2002-2052 Denis Corbin
00004 //
00005 // This program is free software; you can redistribute it and/or
00006 // modify it under the terms of the GNU General Public License
00007 // as published by the Free Software Foundation; either version 2
00008 // of the License, or (at your option) any later version.
00009 //
00010 // This program is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013 // GNU General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU General Public License
00016 // along with this program; if not, write to the Free Software
00017 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00018 //
00019 // to contact the author : http://dar.linux.free.fr/email.html
00020 /*********************************************************************/
00021 // $Id: generic_file.hpp,v 1.50 2011/04/17 16:36:36 edrusb Rel $
00022 //
00023 /*********************************************************************/
00024 
00039 
00040 
00042 // IMPORTANT : THIS FILE MUST ALWAYS BE INCLUDE AFTER infinint.hpp   //
00043 //             (and infinint.hpp must be included too, always)       //
00045 #include "infinint.hpp"
00047 
00048 
00049 
00050 #ifndef GENERIC_FILE_HPP
00051 #define GENERIC_FILE_HPP
00052 
00053 
00054 #include "../my_config.h"
00055 
00056 extern "C"
00057 {
00058 #if HAVE_UNISTD_H
00059 #include <unistd.h>
00060 #endif
00061 } // end extern "C"
00062 
00063 #include "path.hpp"
00064 #include "integers.hpp"
00065 #include "thread_cancellation.hpp"
00066 #include "label.hpp"
00067 #include "crc.hpp"
00068 #include "user_interaction.hpp"
00069 #include "mem_ui.hpp"
00070 
00071 #include <string>
00072 
00073 namespace libdar
00074 {
00075 
00078 
00080     enum gf_mode
00081     {
00082         gf_read_only,  
00083         gf_write_only, 
00084         gf_read_write  
00085     };
00086 
00087 
00088     extern gf_mode generic_file_get_mode(S_I fd);
00089     extern const char * generic_file_get_name(gf_mode mode);
00090 
00092 
00104     class generic_file
00105     {
00106     public :
00108         generic_file(gf_mode m) { rw = m; terminated = false; enable_crc(false); };
00109 
00111         generic_file(const generic_file &ref) { copy_from(ref); };
00112 
00113 
00115 
00117         void terminate() const;
00118 
00119         virtual ~generic_file() {};
00120 
00122         const generic_file & operator = (const generic_file & ref) { copy_from(ref); return *this; };
00123 
00125         gf_mode get_mode() const { return rw; };
00126 
00128 
00134         U_I read(char *a, U_I size);
00135 
00137 
00139         void write(const char *a, U_I size);
00140 
00142 
00144         void write(const std::string & arg);
00145 
00147         S_I read_back(char &a);
00148 
00150         S_I read_forward(char &a) { if(terminated) throw SRC_BUG; return read(&a, 1); };
00151 
00153 
00157         virtual bool skip(const infinint & pos) = 0;
00158 
00160         virtual bool skip_to_eof() = 0;
00161 
00163         virtual bool skip_relative(S_I x) = 0;
00164 
00166         virtual infinint get_position() = 0;
00167 
00169         virtual void copy_to(generic_file &ref);
00170 
00172         virtual void copy_to(generic_file &ref, crc & value);
00173 
00175         U_32 copy_to(generic_file &ref, U_32 size); // returns the number of byte effectively copied
00176 
00178         infinint copy_to(generic_file &ref, infinint size); // returns the number of byte effectively copied
00179 
00181 
00187         bool diff(generic_file & f, crc & value);
00188 
00190 
00192         void reset_crc(const infinint & width);
00193 
00195         bool crc_status() const { return active_read == &generic_file::read_crc; };
00196 
00198 
00201         void get_crc(crc & val) { enable_crc(false); val = checksum; };
00202 
00204         void sync_write();
00205 
00206     protected :
00207         void set_mode(gf_mode x) { rw = x; };
00208 
00210 
00219         virtual U_I inherited_read(char *a, U_I size) = 0;
00220 
00222 
00226         virtual void inherited_write(const char *a, U_I size) = 0;
00227 
00228 
00230 
00233         virtual void inherited_sync_write() = 0;
00234 
00235 
00237 
00240         virtual void inherited_terminate() = 0;
00241 
00242 
00245         bool is_terminated() const { return terminated; };
00246 
00247     private :
00248         gf_mode rw;
00249         crc checksum;
00250         bool terminated;
00251         U_I (generic_file::* active_read)(char *a, U_I size);
00252         void (generic_file::* active_write)(const char *a, U_I size);
00253 
00254         void enable_crc(bool mode);
00255 
00256         U_I read_crc(char *a, U_I size);
00257         void write_crc(const char *a, U_I size);
00258 
00259         void copy_from(const generic_file & ref);
00260     };
00261 
00262 #define CONTEXT_INIT "init"
00263 #define CONTEXT_OP   "operation"
00264 #define CONTEXT_LAST_SLICE  "last_slice"
00265 
00267 
00282 
00283     class label;
00284 
00285     class contextual
00286     {
00287     public :
00288         contextual() { status = ""; };
00289         virtual ~contextual() {};
00290 
00291         virtual void set_info_status(const std::string & s) { status = s; };
00292         virtual std::string get_info_status() const { return status; };
00293         virtual bool is_an_old_start_end_archive() const = 0;
00294 
00295         virtual const label & get_data_name() const = 0;
00296     private:
00297         std::string status;
00298     };
00299 
00301 
00302 } // end of namespace
00303 
00304 #endif
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