/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), m_alg_name(), m_args(), m_mode_info() {
   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	3.48k	std::string make_arg(const std::vector<std::pair<size_t, std::string>>& name, size_t start) {
18	3.48k	std::string output = name[start].second;
19	3.48k	size_t level = name[start].first;
20
21	3.48k	size_t paren_depth = 0;
22
23	3.69k	for(size_t i = start + 1; i != name.size(); ++i) {
24	838	if(name[i].first <= name[start].first) {
25	636	break;
26	636	}
27
28	202	if(name[i].first > level) {
29	202	output += "(" + name[i].second;
30	202	++paren_depth;
31	202	} 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	202	level = name[i].first;
45	202	}
46
47	3.69k	for(size_t i = 0; i != paren_depth; ++i) {
48	202	output += ")";
49	202	}
50
51	3.48k	return output;
52	3.48k	}
53
54		} // namespace
55
56	0	SCAN_Name::SCAN_Name(const char* algo_spec) : SCAN_Name(std::string(algo_spec)) {}
57
58	4.48k	SCAN_Name::SCAN_Name(std::string_view algo_spec) : m_orig_algo_spec(algo_spec), m_alg_name(), m_args(), m_mode_info() {
59	4.48k	if(algo_spec.empty()) {
60	0	throw Invalid_Argument("Expected algorithm name, got empty string");
61	0	}
62
63	4.48k	std::vector<std::pair<size_t, std::string>> name;
64	4.48k	size_t level = 0;
65	4.48k	std::pair<size_t, std::string> accum = std::make_pair(level, "");
66
67	4.48k	const std::string decoding_error = "Bad SCAN name '" + m_orig_algo_spec + "': ";
68
69	43.8k	for(char c : algo_spec) {
70	43.8k	if(c == '/' \|\| c == ',' \|\| c == '(' \|\| c == ')') {
71	6.58k	if(c == '(') {
72	2.89k	++level;
73	3.69k	} else if(c == ')') {
74	2.89k	if(level == 0) {
75	0	throw Decoding_Error(decoding_error + "Mismatched parens");
76	0	}
77	2.89k	--level;
78	2.89k	}
79
80	6.58k	if(c == '/' && level > 0) {
81	0	accum.second.push_back(c);
82	6.58k	} else {
83	6.58k	if(!accum.second.empty()) {
84	6.54k	name.push_back(accum);
85	6.54k	}
86	6.58k	accum = std::make_pair(level, "");
87	6.58k	}
88	37.2k	} else {
89	37.2k	accum.second.push_back(c);
90	37.2k	}
91	43.8k	}
92
93	4.48k	if(!accum.second.empty()) {
94	1.63k	name.push_back(accum);
95	1.63k	}
96
97	4.48k	if(level != 0) {
98	0	throw Decoding_Error(decoding_error + "Missing close paren");
99	0	}
100
101	4.48k	if(name.empty()) {
102	0	throw Decoding_Error(decoding_error + "Empty name");
103	0	}
104
105	4.48k	m_alg_name = name[0].second;
106
107	4.48k	bool in_modes = false;
108
109	8.17k	for(size_t i = 1; i != name.size(); ++i) {
110	3.69k	if(name[i].first == 0) {
111	159	m_mode_info.push_back(make_arg(name, i));
112	159	in_modes = true;
113	3.53k	} else if(name[i].first == 1 && !in_modes) {
114	3.32k	m_args.push_back(make_arg(name, i));
115	3.32k	}
116	3.69k	}
117	4.48k	}
118
119	1.78k	std::string SCAN_Name::arg(size_t i) const {
120	1.78k	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	1.78k	return m_args[i];
124	1.78k	}
125
126	159	std::string SCAN_Name::arg(size_t i, std::string_view def_value) const {
127	159	if(i >= arg_count()) {
128	0	return std::string(def_value);
129	0	}
130	159	return m_args[i];
131	159	}
132
133	208	size_t SCAN_Name::arg_as_integer(size_t i, size_t def_value) const {
134	208	if(i >= arg_count()) {
135	0	return def_value;
136	0	}
137	208	return to_u32bit(m_args[i]);
138	208	}
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: 2026-10-13 06:31