1 files changed, 75 insertions, 0 deletions
diff --git a/src/libstate/scan_name.cpp b/src/libstate/scan_name.cpp
new file mode 100644
index 000000000..4ca6e6d59
--- /dev/null
+++ b/src/libstate/scan_name.cpp
@@ -0,0 +1,75 @@
+/**
+SCAN Name Abstraction
+(C) 2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/scan_name.h>
+#include <botan/parsing.h>
+#include <botan/libstate.h>
+#include <botan/exceptn.h>
+#include <stdexcept>
+
+namespace Botan {
+
+namespace {
+
+std::vector<std::string>
+parse_and_deref_aliases(const std::string& algo_spec)
+   {
+   std::vector<std::string> parts = parse_algorithm_name(algo_spec);
+   std::vector<std::string> out;
+
+   for(size_t i = 0; i != parts.size(); ++i)
+      {
+      std::string part_i = global_state().deref_alias(parts[i]);
+
+      if(i == 0 && part_i.find_first_of(",()") != std::string::npos)
+         {
+         std::vector<std::string> parts_i = parse_and_deref_aliases(part_i);
+
+         for(size_t j = 0; j != parts_i.size(); ++j)
+            out.push_back(parts_i[j]);
+         }
+      else
+         out.push_back(part_i);
+      }
+
+   return out;
+   }
+
+}
+
+SCAN_Name::SCAN_Name(const std::string& algo_spec)
+   {
+   orig_algo_spec = algo_spec;
+
+   name = parse_and_deref_aliases(algo_spec);
+
+   if(name.size() == 0)
+      throw Decoding_Error("Bad SCAN name " + algo_spec);
+   }
+
+std::string SCAN_Name::arg(u32bit i) const
+   {
+   if(i >= arg_count())
+      throw std::range_error("SCAN_Name::argument");
+   return name[i+1];
+   }
+
+std::string SCAN_Name::arg(u32bit i, const std::string& def_value) const
+   {
+   if(i >= arg_count())
+      return def_value;
+   return name[i+1];
+   }
+
+u32bit SCAN_Name::arg_as_u32bit(u32bit i, u32bit def_value) const
+   {
+   if(i >= arg_count())
+      return def_value;
+   return to_u32bit(name[i+1]);
+   }
+
+}