windows_unicode.cpp
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#include "crucible/core/windows_unicode.inl" #include <limits> #include <Windows.h> namespace crucible::core { auto bulk_transcode_utf8_to_wide(String_View const &utf8) -> WindowsUnicodeResult<FFIString<wchar_t>> { constexpr ::UINT CODEPAGE { CP_UTF8 }; constexpr ::DWORD FLAGS { MB_ERR_INVALID_CHARS }; if (utf8.size() > std::numeric_limits<int>::max()) { return make_failure<WindowsUnicodeError>(MultiByteToWideCharInputTooLarge {}); } auto const utf8_size { static_cast<int>(utf8_chars.size()) }; // 1st call: find out how big of a string we need to allocate ::SetLastError(::ERROR_SUCCESS); int const required_size { ::MultiByteToWideChar( CODEPAGE, FLAGS, utf8.data(), utf8_size, nullptr, 0) }; if (required_size <= 0) { return make_failure<WindowsUnicodeError>(MultiByteToWideCharFailed {}); } auto wide { make_heap_buffer<wchar_t>(required_size) }; // 2nd call: actually do the transcoding ::SetLastError(::ERROR_SUCCESS); int const characters_written { ::MultiByteToWideChar( CODEPAGE, FLAGS, utf8.data(), utf8_size, wide.data(), required_size) }; if (characters_written <= 0) { return make_failure<WindowsUnicodeError>(MultiByteToWideCharFailed {}); } if (characters_written != required_size) { return make_failure<WindowsUnicodeError>(MultiByteToWideCharOutputTruncated {}); } return make_success(std::move(wide)); } auto bulk_transcode_wide_to_utf8(FFIString<wchar_t> const &wide) -> WindowsUnicodeResult<String> { constexpr ::UINT CODEPAGE { CP_UTF8 }; constexpr ::DWORD FLAGS { WC_ERR_INVALID_CHARS }; ::LPCCH default_character { nullptr }; ::LPBOOL used_default_character { nullptr }; if (wide.size() > std::numeric_limits<int>::max()) { return make_failure<WindowsUnicodeError>(WideCharToMultiByteInputTooLarge {}); } auto const wide_size { static_cast<int>(wide.size()) }; // 1st call: find out how big of a string we need to allocate ::SetLastError(::ERROR_SUCCESS); int const required_size { ::WideCharToMultiByte( CODEPAGE, FLAGS, wide.data(), wide_size, nullptr, 0, default_character, used_default_character) }; if (required_size <= 0) { return make_failure<WindowsUnicodeError>(WideCharToMultiByteFailed {}); } auto utf8 { make_heap_buffer<char>(required_size) }; // 2nd call: actually do the transcoding ::SetLastError(::ERROR_SUCCESS); int const bytes_written { ::WideCharToMultiByte( CODEPAGE, FLAGS, wide.data(), wide_size, utf8.data(), required_size, default_character, used_default_character) }; if (bytes_written <= 0) { return make_failure<WindowsUnicodeError>(WideCharToMultiByteFailed {}); } if (bytes_written != required_size) { return make_failure<WindowsUnicodeError>(WideCharToMultiByteOutputTruncated {}); } return make_success(std::move(utf8)); } }