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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
#ifndef BOOST_LOCALE_UTIL_ENCODING_HPP
#define BOOST_LOCALE_UTIL_ENCODING_HPP
#include <boost/locale/config.hpp>
#include <boost/core/detail/string_view.hpp>
#include <cstdint>
#include <string>
#include <type_traits>
#include <vector>
namespace boost { namespace locale { namespace util {
/// Get the UTF encoding name of the given \a CharType
template<typename CharType>
const char* utf_name()
{
constexpr auto CharSize = sizeof(CharType);
static_assert(CharSize == 1 || CharSize == 2 || CharSize == 4, "Unknown Character Encoding");
switch(CharSize) {
case 1: return "UTF-8";
case 2: {
const int16_t endianMark = 1;
const bool isLittleEndian = reinterpret_cast<const char*>(&endianMark)[0] == 1;
return isLittleEndian ? "UTF-16LE" : "UTF-16BE";
}
case 4: {
const int32_t endianMark = 1;
const bool isLittleEndian = reinterpret_cast<const char*>(&endianMark)[0] == 1;
return isLittleEndian ? "UTF-32LE" : "UTF-32BE";
}
}
BOOST_UNREACHABLE_RETURN("Unknown UTF");
}
#ifdef __cpp_char8_t
template<typename T>
struct is_char8_t : std::is_same<T, char8_t> {};
#else
template<typename T>
struct is_char8_t : std::false_type {};
#endif
/// Make encoding lowercase and remove all non-alphanumeric characters
BOOST_LOCALE_DECL std::string normalize_encoding(core::string_view encoding);
/// True if the normalized encodings are equal
inline bool are_encodings_equal(const std::string& l, const std::string& r)
{
return normalize_encoding(l) == normalize_encoding(r);
}
BOOST_LOCALE_DECL std::vector<std::string> get_simple_encodings();
#if BOOST_LOCALE_USE_WIN32_API
int encoding_to_windows_codepage(core::string_view encoding);
#else
// Requires WinAPI -> Dummy returning invalid
inline int encoding_to_windows_codepage(core::string_view) // LCOV_EXCL_LINE
{
return -1; // LCOV_EXCL_LINE
}
#endif
}}} // namespace boost::locale::util
#endif
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