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secu_string.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
8 // of the License, or (at your option) any later version.
9 //
10 // This program is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License
16 // along with this program; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 //
19 // to contact the author : http://dar.linux.free.fr/email.html
20 /*********************************************************************/
21 // $Id: secu_string.hpp,v 1.4.2.2 2012/02/19 17:25:09 edrusb Rel $
22 //
23 /*********************************************************************/
24 //
25 
35 
36 #ifndef SECU_STRING_HPP
37 #define SECU_STRING_HPP
38 
39 #include "../my_config.h"
40 
41 #include <string>
42 #include "integers.hpp"
43 #include "special_alloc.hpp"
44 
45 namespace libdar
46 {
47 
50 
52 
60 
62  {
63  public:
65 
70  static bool is_string_secured();
71 
73 
76  secu_string(U_I size = 0) { init(size); };
77 
79 
81  secu_string(const char *ptr, U_I size) { init(size); append(ptr, size); };
82 
84  secu_string(const secu_string & ref) { copy_from(ref); };
85 
86 
88  secu_string & operator = (const secu_string & ref) { clean_and_destroy(); copy_from(ref); return *this; };
89 
90  bool operator != (const std::string & ref) const { return ! (*this == ref); };
91  bool operator != (const secu_string & ref) const { return ! (*this == ref); };
92  bool operator == (const std::string &ref) const { return compare_with(ref.c_str(),(U_I)(ref.size())); };
93  bool operator == (const secu_string &ref) const { return compare_with(ref.mem, *ref.string_size); };
94 
96  ~secu_string() { clean_and_destroy(); };
97 
99 
104  void read(int fd, U_I size);
105 
107 
114  void append(const char *ptr, U_I size);
115 
117  void append(int fd, U_I size);
118 
121  void reduce_string_size_to(U_I pos);
122 
124  void clear() { clean_and_destroy(); init(0); };
125 
127 
129  void clear_and_resize(U_I size) { clean_and_destroy(); init(size); };
130 
131  void clear_and_not_resize() { string_size = 0; };
132 
134 
138  const char*c_str() const { return mem == NULL ? throw SRC_BUG : mem; };
139 
141 
144  U_I size() const { return *string_size; }; // returns the size of the string
145 
146 #ifdef LIBDAR_SPECIAL_ALLOC
147  USE_SPECIAL_ALLOC(secu_string);
148 #endif
149  private:
150  U_I *allocated_size;
151  char *mem;
152  U_I *string_size;
153 
154  void init(U_I size);
155  void copy_from(const secu_string & ref);
156  bool compare_with(const char *ptr, U_I size) const;
157  void clean_and_destroy();
158  };
159 
161 
162 } // end of namespace
163 
164 #endif