/src/botan/src/lib/utils/scan_name.cpp

Source
/*
* SCAN Name Abstraction
* (C) 2008-2009,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/internal/scan_name.h>

#include <botan/exceptn.h>
#include <botan/internal/parsing.h>

namespace Botan {

namespace {

std::string make_arg(const std::vector<std::pair<size_t, std::string>>& name, size_t start) {
   std::string output = name[start].second;
   size_t level = name[start].first;

   size_t paren_depth = 0;

   for(size_t i = start + 1; i != name.size(); ++i) {
      if(name[i].first <= name[start].first) {
         break;
      }

      if(name[i].first > level) {
         output += "(" + name[i].second;
         ++paren_depth;
      } else if(name[i].first < level) {
         for(size_t j = name[i].first; j < level; j++) {
            output += ")";
            --paren_depth;
         }
         output += "," + name[i].second;
      } else {
         if(output[output.size() - 1] != '(') {
            output += ",";
         }
         output += name[i].second;
      }

      level = name[i].first;
   }

   for(size_t i = 0; i != paren_depth; ++i) {
      output += ")";
   }

   return output;
}

}  // namespace

SCAN_Name::SCAN_Name(const char* algo_spec) : SCAN_Name(std::string(algo_spec)) {}

SCAN_Name::SCAN_Name(std::string_view algo_spec) : m_orig_algo_spec(algo_spec) {
   if(algo_spec.empty()) {
      throw Invalid_Argument("Expected algorithm name, got empty string");
   }

   std::vector<std::pair<size_t, std::string>> name;
   size_t level = 0;
   std::pair<size_t, std::string> accum = std::make_pair(level, "");

   const std::string decoding_error = "Bad SCAN name '" + m_orig_algo_spec + "': ";

   for(char c : algo_spec) {
      if(c == '/' || c == ',' || c == '(' || c == ')') {
         if(c == '(') {
            ++level;
         } else if(c == ')') {
            if(level == 0) {
               throw Decoding_Error(decoding_error + "Mismatched parens");
            }
            --level;
         }

         if(c == '/' && level > 0) {
            accum.second.push_back(c);
         } else {
            if(!accum.second.empty()) {
               name.push_back(accum);
            }
            accum = std::make_pair(level, "");
         }
      } else {
         accum.second.push_back(c);
      }
   }

   if(!accum.second.empty()) {
      name.push_back(accum);
   }

   if(level != 0) {
      throw Decoding_Error(decoding_error + "Missing close paren");
   }

   if(name.empty()) {
      throw Decoding_Error(decoding_error + "Empty name");
   }

   m_alg_name = name[0].second;

   bool in_modes = false;

   for(size_t i = 1; i != name.size(); ++i) {
      if(name[i].first == 0) {
         m_mode_info.push_back(make_arg(name, i));
         in_modes = true;
      } else if(name[i].first == 1 && !in_modes) {
         m_args.push_back(make_arg(name, i));
      }
   }
}

std::string SCAN_Name::arg(size_t i) const {
   if(i >= arg_count()) {
      throw Invalid_Argument("SCAN_Name::arg " + std::to_string(i) + " out of range for '" + to_string() + "'");
   }
   return m_args[i];
}

std::string SCAN_Name::arg(size_t i, std::string_view def_value) const {
   if(i >= arg_count()) {
      return std::string(def_value);
   }
   return m_args[i];
}

size_t SCAN_Name::arg_as_integer(size_t i, size_t def_value) const {
   if(i >= arg_count()) {
      return def_value;
   }
   return to_u32bit(m_args[i]);
}

size_t SCAN_Name::arg_as_integer(size_t i) const {
   return to_u32bit(arg(i));
}

}  // namespace Botan

Line	Count	Source
1		/*
2		* SCAN Name Abstraction
3		* (C) 2008-2009,2015 Jack Lloyd
4		*
5		* Botan is released under the Simplified BSD License (see license.txt)
6		*/
7
8		#include <botan/internal/scan_name.h>
9
10		#include <botan/exceptn.h>
11		#include <botan/internal/parsing.h>
12
13		namespace Botan {
14
15		namespace {
16
17	2.83k	std::string make_arg(const std::vector<std::pair<size_t, std::string>>& name, size_t start) {
18	2.83k	std::string output = name[start].second;
19	2.83k	size_t level = name[start].first;
20
21	2.83k	size_t paren_depth = 0;
22
23	3.05k	for(size_t i = start + 1; i != name.size(); ++i) {
24	775	if(name[i].first <= name[start].first) {
25	552	break;
26	552	}
27
28	223	if(name[i].first > level) {
29	223	output += "(" + name[i].second;
30	223	++paren_depth;
31	223	} else if(name[i].first < level) {
32	0	for(size_t j = name[i].first; j < level; j++) {
33	0	output += ")";
34	0	--paren_depth;
35	0	}
36	0	output += "," + name[i].second;
37	0	} else {
38	0	if(output[output.size() - 1] != '(') {
39	0	output += ",";
40	0	}
41	0	output += name[i].second;
42	0	}
43
44	223	level = name[i].first;
45	223	}
46
47	3.05k	for(size_t i = 0; i != paren_depth; ++i) {
48	223	output += ")";
49	223	}
50
51	2.83k	return output;
52	2.83k	}
53
54		} // namespace
55
56	0	SCAN_Name::SCAN_Name(const char* algo_spec) : SCAN_Name(std::string(algo_spec)) {}
57
58	3.53k	SCAN_Name::SCAN_Name(std::string_view algo_spec) : m_orig_algo_spec(algo_spec) {
59	3.53k	if(algo_spec.empty()) {
60	0	throw Invalid_Argument("Expected algorithm name, got empty string");
61	0	}
62
63	3.53k	std::vector<std::pair<size_t, std::string>> name;
64	3.53k	size_t level = 0;
65	3.53k	std::pair<size_t, std::string> accum = std::make_pair(level, "");
66
67	3.53k	const std::string decoding_error = "Bad SCAN name '" + m_orig_algo_spec + "': ";
68
69	34.9k	for(char c : algo_spec) {
70	34.9k	if(c == '/' \|\| c == ',' \|\| c == '(' \|\| c == ')') {
71	5.42k	if(c == '(') {
72	2.36k	++level;
73	3.05k	} else if(c == ')') {
74	2.36k	if(level == 0) {
75	0	throw Decoding_Error(decoding_error + "Mismatched parens");
76	0	}
77	2.36k	--level;
78	2.36k	}
79
80	5.42k	if(c == '/' && level > 0) {
81	0	accum.second.push_back(c);
82	5.42k	} else {
83	5.42k	if(!accum.second.empty()) {
84	5.34k	name.push_back(accum);
85	5.34k	}
86	5.42k	accum = std::make_pair(level, "");
87	5.42k	}
88	29.5k	} else {
89	29.5k	accum.second.push_back(c);
90	29.5k	}
91	34.9k	}
92
93	3.53k	if(!accum.second.empty()) {
94	1.25k	name.push_back(accum);
95	1.25k	}
96
97	3.53k	if(level != 0) {
98	0	throw Decoding_Error(decoding_error + "Missing close paren");
99	0	}
100
101	3.53k	if(name.empty()) {
102	0	throw Decoding_Error(decoding_error + "Empty name");
103	0	}
104
105	3.53k	m_alg_name = name[0].second;
106
107	3.53k	bool in_modes = false;
108
109	6.59k	for(size_t i = 1; i != name.size(); ++i) {
110	3.05k	if(name[i].first == 0) {
111	138	m_mode_info.push_back(make_arg(name, i));
112	138	in_modes = true;
113	2.92k	} else if(name[i].first == 1 && !in_modes) {
114	2.69k	m_args.push_back(make_arg(name, i));
115	2.69k	}
116	3.05k	}
117	3.53k	}
118
119	1.37k	std::string SCAN_Name::arg(size_t i) const {
120	1.37k	if(i >= arg_count()) {
121	0	throw Invalid_Argument("SCAN_Name::arg " + std::to_string(i) + " out of range for '" + to_string() + "'");
122	0	}
123	1.37k	return m_args[i];
124	1.37k	}
125
126	138	std::string SCAN_Name::arg(size_t i, std::string_view def_value) const {
127	138	if(i >= arg_count()) {
128	0	return std::string(def_value);
129	0	}
130	138	return m_args[i];
131	138	}
132
133	280	size_t SCAN_Name::arg_as_integer(size_t i, size_t def_value) const {
134	280	if(i >= arg_count()) {
135	0	return def_value;
136	0	}
137	280	return to_u32bit(m_args[i]);
138	280	}
139
140	0	size_t SCAN_Name::arg_as_integer(size_t i) const {
141	0	return to_u32bit(arg(i));
142	0	}
143
144		} // namespace Botan

Coverage Report

Created: 2025-11-16 06:36