| Disk ARchive 2.7.14 Full featured and portable backup and archiving tool

Loading...
Searching...
No Matches
mycurl_param_list.hpp
Go to the documentation of this file.
1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2024 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18//
19// to contact the author, see the AUTHOR file
20/*********************************************************************/
21
25
26#ifndef MYCURL_PARAM_LIST_HPP
27#define MYCURL_PARAM_LIST_HPP
28
29#include "../my_config.h"
30
31 extern "C"
32{
33#if LIBCURL_AVAILABLE
34#if HAVE_CURL_CURL_H
35#include <curl/curl.h>
36#endif
37#endif
38} // end extern "C"
39
40
41#include <string>
42#include <memory>
43#include <map>
44#include <list>
45#include "integers.hpp"
46#include "erreurs.hpp"
47
48 namespace libdar
49{
50
53
54
55 // libcurl uses a list of options to a CURL handle, which argument is of variable type
56 // we want to record this list to be able to reset, copy, and do other fancy operations
57 // on CURL handle and have all these managed within a single class (mycurl_easyhandle_node)
58 // for that we need here a list of association of CURLoption type with variable typed value
59 //
60 // This is implemented by a ancestor type (mycurl_param_element_generic) which is an pure abstracted
61 // class, from which derives many template based classes: mycurl_param_element<T>.
62
63
64
66
67 class mycurl_param_element_generic
68 {
69 public:
70 virtual ~mycurl_param_element_generic() = default;
71
72 virtual bool operator == (const mycurl_param_element_generic & val) const = 0;
73 virtual bool operator != (const mycurl_param_element_generic & val) const { return ! (*this == val); };
74
75 virtual std::unique_ptr<mycurl_param_element_generic> clone() const = 0;
76 };
77
78
79
80
82
83 template <class T> class mycurl_param_element: public mycurl_param_element_generic
84 {
85 public:
86 mycurl_param_element(const T & arg): val(arg) {};
87 mycurl_param_element(const mycurl_param_element<T> & e): val(e.val) {};
88 mycurl_param_element(mycurl_param_element<T> && e) noexcept: val(std::move(e.val)) {};
89 mycurl_param_element<T> & operator = (const mycurl_param_element<T> & e) { val = e.val; return this; };
90 mycurl_param_element<T> & operator = (mycurl_param_element<T> && e) { val = std::move(e.val); return this; };
91 ~mycurl_param_element() = default;
92
93 virtual bool operator == (const mycurl_param_element_generic & arg) const override
94 {
95 const mycurl_param_element<T>* arg_ptr = dynamic_cast<const mycurl_param_element<T>*>(&arg);
96 if(arg_ptr == nullptr)
97 return false;
98 return arg_ptr->val == val;
99 }
100
101 T get_value() const { return val; };
102 const T* get_value_address() const { return &val; };
103 void set_value(const T & arg) { val = arg; };
104
105 virtual std::unique_ptr<mycurl_param_element_generic> clone() const override
106 {
107 std::unique_ptr<mycurl_param_element_generic> ret;
108
109 try
110 {
111 ret = std::make_unique<mycurl_param_element<T> >(val);
112 if(!ret)
113 throw Ememory("mycurl_param_list::clone");
114 }
115 catch(...)
116 {
117 throw Ememory("mycurl_param_list::clone");
118 }
119
120 return ret;
121 };
122
123 private:
124 T val;
125 };
126
127
130
131 class mycurl_param_list
132 {
133 public:
134#ifndef LIBCURL_AVAILABLE
135
136 // libcurl not available, no field to initialize
137 mycurl_param_list() {};
138
139#else
140
141 mycurl_param_list() { reset_read(); }; // fields "element_list" and "cursor" are objects and get initialized by their default constructor
142
143 mycurl_param_list(const mycurl_param_list & ref) { copy_from(ref); };
144 mycurl_param_list(mycurl_param_list && ref) noexcept = default;
145 mycurl_param_list & operator = (const mycurl_param_list & ref) { element_list.clear(); copy_from(ref); reset_read(); return *this; };
146 mycurl_param_list & operator = (mycurl_param_list && ref) = default;
147 ~mycurl_param_list() = default;
148
149 // operations with the list
150
151 template<class T> void add(CURLoption opt, const T & val) { element_list[opt] = std::make_unique<mycurl_param_element<T> >(val); reset_read(); }
152 void clear(CURLoption opt);
153 void clear() { element_list.clear(); reset_read(); };
154 U_I size() const { return element_list.size(); };
155 void reset_read() const { cursor = element_list.begin(); };
156 bool read_next(CURLoption & opt);
157
158 template<class T> void read_opt(const T* & val) const
159 {
160 if(cursor == element_list.end())
161 throw Erange("mycurl_param_list::read_opt", "Cannot read option when no more option is available");
162
163 if(cursor->second)
164 {
165 const mycurl_param_element<T>* ptr = dynamic_cast<const mycurl_param_element<T>*>(cursor->second.get());
166
167 if(ptr != nullptr)
168 val = ptr->get_value_address();
169 else
170 val = nullptr;
171 }
172 else
173 val = nullptr;
174
175 ++cursor;
176 }
177
178 template<class T>bool get_val(CURLoption opt, const T* & val) const
179 {
180 std::map<CURLoption, std::unique_ptr<mycurl_param_element_generic> >::const_iterator it = element_list.find(opt);
181
182 if(it == element_list.end())
183 return false;
184
185 if(it->second)
186 {
187 const mycurl_param_element<T>* ptr = dynamic_cast<const mycurl_param_element<T>*>(it->second.get());
188
189 if(ptr != nullptr)
190 val = ptr->get_value_address();
191 else
192 val = nullptr;
193 }
194 else
195 val = nullptr;
196
197 return true;
198 }
199
200 // operations between lists
201
202
205
213
214 std::list<CURLoption> update_with(const mycurl_param_list & wanted);
215
216 private:
217 std::map<CURLoption, std::unique_ptr<mycurl_param_element_generic> > element_list;
218 mutable std::map<CURLoption, std::unique_ptr<mycurl_param_element_generic> >::const_iterator cursor;
219
220 void add_clone(CURLoption opt, const mycurl_param_element_generic & val) { element_list[opt] = val.clone(); }
221 void copy_from(const mycurl_param_list & ref);
222
223#endif
224 };
225
226
228
229
230} // end of namespace
231
232#endif
233
libdar::Ememory
exception used when memory has been exhausted
Definition erreurs.hpp:127
libdar::Erange
exception used to signal range error
Definition erreurs.hpp:220
libdar::mycurl_param_element_generic
the ancestor class of etherogeneous list/map
Definition mycurl_param_list.hpp:68
libdar::mycurl_param_element
the implemented inherited classes of the abstracted class for etherogeneous list/map
Definition mycurl_param_list.hpp:84
libdar::mycurl_param_list
Definition mycurl_param_list.hpp:132
erreurs.hpp
contains all the excetion class thrown by libdar
integers.hpp
are defined here basic integer types that tend to be portable
libdar
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47