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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
// Copyright (c) 2022-2025 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include "encoding.hpp"
#include <boost/locale/util/string.hpp>
#if BOOST_LOCALE_USE_WIN32_API
# include "win_codepages.hpp"
# ifndef NOMINMAX
# define NOMINMAX
# endif
# include <windows.h>
#endif
#include <algorithm>
#include <cstring>
namespace boost { namespace locale { namespace util {
std::string normalize_encoding(const core::string_view encoding)
{
std::string result;
result.reserve(encoding.length());
for(char c : encoding) {
if(is_lower_ascii(c) || is_numeric_ascii(c))
result += c;
else if(is_upper_ascii(c))
result += char(c - 'A' + 'a');
}
return result;
}
#if BOOST_LOCALE_USE_WIN32_API
static int normalized_encoding_to_windows_codepage(const std::string& encoding)
{
windows_encoding* end = std::end(all_windows_encodings);
windows_encoding* ptr = std::lower_bound(all_windows_encodings, end, encoding.c_str());
while(ptr != end && ptr->name == encoding) {
if(ptr->was_tested)
return ptr->codepage;
else if(IsValidCodePage(ptr->codepage)) {
// the thread safety is not an issue, maximum
// it would be checked more then once
ptr->was_tested = 1;
return ptr->codepage;
} else
++ptr;
}
return -1;
}
int encoding_to_windows_codepage(const core::string_view encoding)
{
return normalized_encoding_to_windows_codepage(normalize_encoding(encoding));
}
#endif
}}} // namespace boost::locale::util
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