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// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "winapi-utf8" project.
// For details, see https://github.com/egor-tensin/winapi-utf8.
// Distributed under the MIT License.
#include <winapi/utf8.hpp>
#include <windows.h>
#include <cstddef>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
namespace winapi {
namespace {
std::runtime_error error(const char* function, DWORD code) {
std::ostringstream oss;
oss << function << " failed with error code " << code;
return std::runtime_error{oss.str()};
}
}
std::wstring widen(const std::string& src) {
return widen(src.c_str(), src.size());
}
std::wstring widen(const std::vector<unsigned char>& src) {
return widen(src.data(), src.size());
}
std::wstring widen(const void* src, std::size_t in_nb) {
const DWORD flags = MB_ERR_INVALID_CHARS
| MB_PRECOMPOSED;
const char* in_data = reinterpret_cast<const char*>(src);
auto out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, in_nb, NULL, 0);
if (out_nch == 0) {
throw error("MultiByteToWideChar", GetLastError());
}
static_assert(sizeof(wchar_t) == sizeof(WCHAR), "wchar_t != WCHAR");
std::vector<wchar_t> out;
out.resize(out_nch);
out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, in_nb, out.data(), out.size());
if (out_nch == 0) {
throw error("MultiByteToWideChar", GetLastError());
}
return {out.data(), out.size()};
}
std::string narrow(const std::wstring& src) {
static_assert(sizeof(std::wstring::value_type) == sizeof(WCHAR), "wchar_t != WCHAR");
return narrow(src.c_str(), src.size() * sizeof(std::wstring::value_type));
}
std::string narrow(const std::vector<unsigned char>& src) {
return narrow(src.data(), src.size());
}
std::string narrow(const void* src, std::size_t in_nb) {
if (in_nb % sizeof(WCHAR) != 0) {
std::ostringstream err_msg;
err_msg << "narrow: invalid buffer size: " << in_nb;
throw std::runtime_error{err_msg.str()};
}
const std::size_t in_nch = in_nb / sizeof(WCHAR);
const DWORD flags = WC_ERR_INVALID_CHARS
| WC_NO_BEST_FIT_CHARS;
const wchar_t* in_data = reinterpret_cast<const wchar_t*>(src);
auto out_nb = ::WideCharToMultiByte(CP_UTF8, flags, in_data, in_nch, NULL, 0, NULL, NULL);
if (out_nb == 0) {
throw error("WideCharToMultiByte", GetLastError());
}
std::vector<char> out;
out.resize(out_nb);
out_nb = ::WideCharToMultiByte(CP_UTF8, flags, in_data, in_nch, out.data(), out.size(), NULL, NULL);
if (out_nb == 0) {
throw error("WideCharToMultiByte", GetLastError());
}
return {out.data(), out.size()};
}
}
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