windows_string.cpp

#include "windows_string.h"

#include <Windows.h>

#include <stdexcept>
#include <system_error>

namespace flexasio {

	std::string ConvertToUTF8(std::wstring_view input) {
		if (input.size() == 0) return {};

		const auto size = ::WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, input.data(), static_cast<int>(input.size()), NULL, 0, NULL, NULL);
		if (size <= 0) throw std::system_error(::GetLastError(), std::system_category(), "Unable to get size for string conversion to UTF-8");

		std::string result(size, 0);
		if (::WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, input.data(), int(input.size()), result.data(), int(result.size()), NULL, NULL) != int(result.size()))
			throw std::system_error(::GetLastError(), std::system_category(), "Unable to convert string to UTF-8");
		return result;
	}

	std::wstring ConvertFromUTF8(std::string_view input) {
		if (input.size() == 0) return {};

		const auto size = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, input.data(), int(input.size()), NULL, 0);
		if (size <= 0) throw std::system_error(::GetLastError(), std::system_category(), "Unable to get size for string conversion from UTF-8");

		std::wstring result(size, 0);
		if (::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, input.data(), int(input.size()), result.data(), int(result.size())) != int(result.size()))
			throw std::system_error(::GetLastError(), std::system_category(), "Unable to convert string from UTF-8");
		return result;
	}

}