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/**
* 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 <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;
try
{
name = parse_and_deref_aliases(algo_spec);
if(name.size() == 0)
throw Decoding_Error("Bad SCAN name " + algo_spec);
}
catch(Invalid_Algorithm_Name)
{
name.clear();
}
if(name.size() == 0 && algo_spec.find('/') != std::string::npos)
{
std::vector<std::string> algo_parts = split_on(algo_spec, '/');
name = parse_and_deref_aliases(algo_parts[0]);
if(name.size() == 0)
throw Decoding_Error("Bad SCAN name " + algo_spec);
for(size_t i = 1; i != algo_parts.size(); ++i)
mode_str.push_back(algo_parts[i]);
}
}
std::string SCAN_Name::algo_name_and_args() const
{
std::string out;
out = name[0];
if(arg_count())
{
out += '(';
for(u32bit i = 0; i != arg_count(); ++i)
{
out += arg(i);
if(i != arg_count() - 1)
out += ',';
}
out += ')';
}
return out;
}
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]);
}
}
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