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secu_string.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 // $Id$
00022 //
00023 /*********************************************************************/
00024 //
00025 
00035 
00036 #ifndef SECU_STRING_HPP
00037 #define SECU_STRING_HPP
00038 
00039 #include "../my_config.h"
00040 
00041 #include <string>
00042 #include "integers.hpp"
00043 #include "special_alloc.hpp"
00044 
00045 namespace libdar
00046 {
00047 
00050 
00052 
00060 
00061     class secu_string
00062     {
00063     public:
00065 
00070         static bool is_string_secured();
00071 
00073 
00076         secu_string(U_I size = 0) { init(size); };
00077 
00079 
00081         secu_string(const char *ptr, U_I size) { init(size); append(ptr, size); };
00082 
00084         secu_string(const secu_string & ref) { copy_from(ref); };
00085 
00086 
00088         secu_string & operator = (const secu_string & ref) { clean_and_destroy(); copy_from(ref); return *this; };
00089 
00090         bool operator != (const std::string & ref) const { return ! (*this == ref); };
00091         bool operator != (const secu_string & ref) const { return ! (*this == ref); };
00092         bool operator == (const std::string &ref) const { return compare_with(ref.c_str(),(U_I)(ref.size())); };
00093         bool operator == (const secu_string &ref) const { return compare_with(ref.mem, *ref.string_size); };
00094 
00096         ~secu_string() { clean_and_destroy(); };
00097 
00099 
00104         void read(int fd, U_I size);
00105 
00107 
00114         void append(const char *ptr, U_I size);
00115 
00117         void append(int fd, U_I size);
00118 
00121         void reduce_string_size_to(U_I pos);
00122 
00124         void clear() { clean_and_destroy(); init(0); };
00125 
00127 
00129         void clear_and_resize(U_I size) { clean_and_destroy(); init(size); };
00130 
00131         void clear_and_not_resize() {  string_size = 0; };
00132 
00134 
00138         const char*c_str() const { return mem == NULL ? throw SRC_BUG : mem; };
00139 
00141 
00144         U_I size() const { return *string_size; }; // returns the size of the string
00145 
00146 #ifdef LIBDAR_SPECIAL_ALLOC
00147         USE_SPECIAL_ALLOC(secu_string);
00148 #endif
00149     private:
00150         U_I *allocated_size;
00151         char *mem;
00152         U_I *string_size;
00153 
00154         void init(U_I size);
00155         void copy_from(const secu_string & ref);
00156         bool compare_with(const char *ptr, U_I size) const;
00157         void clean_and_destroy();
00158     };
00159 
00161 
00162 } // end of namespace
00163 
00164 #endif
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