Disk ARchive  2.5.3
Full featured and portable backup and archiving tool
hash_fichier.hpp
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1 /*********************************************************************/
2 // dar - disk archive - a backup/restoration program
3 // Copyright (C) 2002-2052 Denis Corbin
4 //
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License
7 // as published by the Free Software Foundation; either version 2
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9 //
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13 // GNU General Public License for more details.
14 //
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19 // to contact the author : http://dar.linux.free.fr/email.html
20 /*********************************************************************/
21 
29 
30 #ifndef HASH_FICHIER_HPP
31 #define HASH_FICHIER_HPP
32 
33 #include "../my_config.h"
34 
35 extern "C"
36 {
37 #if HAVE_GCRYPT_H
38 #ifndef GCRYPT_NO_DEPRECATED
39 #define GCRYPT_NO_DEPRECATED
40 #endif
41 #include <gcrypt.h>
42 #endif
43 }
44 
45 #include <string>
46 
47 #include "generic_file.hpp"
48 #include "fichier_global.hpp"
49 #include "integers.hpp"
50 
51 namespace libdar
52 {
53 
56 
57  enum hash_algo
58  {
59  hash_none, //< no hashing algorithm
60  hash_md5, //< MD5 algorithm
61  hash_sha1, //< SHA1 algorithm
62  hash_sha512 //< SHA-512 algorithm
63  };
64 
65 
68 
69  extern std::string hash_algo_to_string(hash_algo algo);
70 
71  class hash_fichier : public fichier_global
72  {
73  public:
74 
83 
84  hash_fichier(user_interaction & dialog,
85  fichier_global *under,
86  const std::string & under_filename,
87  fichier_global *hash_file,
88  hash_algo algo);
89 
90  // copy constructor
91  hash_fichier(const hash_fichier & ref) : fichier_global(ref) { throw SRC_BUG; };
92 
93  // assignment operator
94  const hash_fichier & operator = (const hash_fichier & ref) { throw SRC_BUG; };
95 
96  // destructor
97  ~hash_fichier();
98 
99  // inherited from fichier_global
100  void change_ownership(const std::string & user, const std::string & group) { if(ref == nullptr || hash_ref == nullptr) throw SRC_BUG; ref->change_ownership(user, group); hash_ref->change_ownership(user, group); };
101  void change_permission(U_I perm) { if(ref == nullptr || hash_ref == nullptr) throw SRC_BUG; ref->change_permission(perm); hash_ref->change_permission(perm); };
102  infinint get_size() const { if(ref == nullptr) throw SRC_BUG; return ref->get_size(); };
103  void fadvise(advise adv) const { if(ref == nullptr) throw SRC_BUG; ref->fadvise(adv); };
104 
105  // inherited from generic_file
106  bool skippable(skippability direction, const infinint & amount) { return false; };
107  bool skip(const infinint & pos) {if(ref == nullptr || pos != ref->get_position()) throw SRC_BUG; else return true; };
108  bool skip_to_eof() { if(get_mode() == gf_write_only) return true; else throw SRC_BUG; };
109  bool skip_relative(S_I x) { if(x != 0) throw SRC_BUG; else return true; };
110  infinint get_position() const { if(ref == nullptr) throw SRC_BUG; return ref->get_position(); };
111 
113  void set_only_hash() { only_hash = true; };
114 
115  protected:
116  // inherited from fichier_global
117  void inherited_read_ahead(const infinint & amount) { ref->read_ahead(amount); };
118  U_I fichier_global_inherited_write(const char *a, U_I size);
119  bool fichier_global_inherited_read(char *a, U_I size, U_I & read, std::string & message);
120 
121  // inherited from generic_file
122  void inherited_sync_write() {};
123  void inherited_flush_read() {};
124  void inherited_terminate();
125 
126  private:
127  fichier_global *ref;
128  fichier_global *hash_ref;
129  bool only_hash; //< if set, avoids copying data to file, only compute hash (debugging purpose)
130 #if CRYPTO_AVAILABLE
131  gcry_md_hd_t hash_handle;
132 #endif
133  std::string ref_filename;
134  U_I hash_gcrypt;
135  bool eof;
136  bool hash_dumped;
137  };
138 
140 
141 } // end of namespace
142 
143 
144 #endif
are defined here basic integer types that tend to be portable
write only access
class generic_file is defined here as well as class fichierthe generic_file interface is widely used ...
This is a pure virtual class that is used by libdar when interaction with the user is required...
class fichier_global definition. This class is a pure virtual class class fichier_global is an abstra...
the arbitrary large positive integer class
libdar namespace encapsulate all libdar symbols
Definition: archive.hpp:47