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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 <cstdint>
#include <format>
#include <limits>
#include <stdexcept>
#include <string>
#include <vector>
namespace winapi {
namespace {
std::runtime_error error(const char* function, DWORD code) {
return std::runtime_error{std::format("Function {} failed with error code {}", function, code)};
}
bool size_t_to_int(std::size_t src, int32_t& dest) {
if (src > static_cast<uint32_t>(std::numeric_limits<int32_t>::max()))
return false;
dest = static_cast<int32_t>(src);
return true;
}
bool int_to_size_t(int32_t src, std::size_t& dest) {
if (src < 0 || static_cast<uint32_t>(src) > std::numeric_limits<std::size_t>::max())
return false;
dest = static_cast<std::size_t>(src);
return true;
}
int32_t convert_input_bytes_to_bytes(std::size_t nb) {
int32_t real_nb = 0;
if (!size_t_to_int(nb, real_nb))
throw std::runtime_error{std::format("Input buffer is too large at {} bytes", nb)};
return real_nb;
}
int32_t convert_input_bytes_to_chars(std::size_t nb) {
if (nb % sizeof(WCHAR) != 0)
throw std::runtime_error{std::format("Buffer size invalid at {} bytes", nb)};
const std::size_t nch = nb / sizeof(WCHAR);
int32_t real_nch = 0;
if (!size_t_to_int(nch, real_nch))
throw std::runtime_error{std::format("Input buffer is too large at {} characters", nch)};
return real_nch;
}
template <typename CharT>
std::vector<CharT> output_buffer(int32_t size) {
std::size_t real_size = 0;
if (!int_to_size_t(size, real_size))
throw std::runtime_error{std::format("Buffer size invalid at {} bytes", size)};
std::vector<CharT> buffer;
buffer.resize(real_size);
return buffer;
}
template <typename CharT>
void verify_output(const std::vector<CharT>& expected, int32_t _actual_size) {
std::size_t actual_size = 0;
if (!int_to_size_t(_actual_size, actual_size) || expected.size() != actual_size)
throw std::runtime_error{
std::format("Expected output length {}, got {}", expected.size(), _actual_size)};
}
} // namespace
std::wstring widen(std::string_view src) {
return widen(src.data(), src.length());
}
std::wstring widen(std::u8string_view src) {
return widen(src.data(), src.length());
}
std::wstring widen(const void* src, std::size_t in_nb) {
const DWORD flags = MB_ERR_INVALID_CHARS;
const auto in_data = reinterpret_cast<const char*>(src);
const auto real_in_nb = convert_input_bytes_to_bytes(in_nb);
auto out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, real_in_nb, NULL, 0);
if (out_nch == 0) {
throw error("MultiByteToWideChar", GetLastError());
}
static_assert(sizeof(wchar_t) == sizeof(WCHAR), "wchar_t != WCHAR");
auto out = output_buffer<wchar_t>(out_nch);
out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, real_in_nb, out.data(), out_nch);
if (out_nch == 0) {
throw error("MultiByteToWideChar", GetLastError());
}
verify_output(out, out_nch);
return {out.data(), out.size()};
}
std::string narrow(std::wstring_view src) {
static_assert(sizeof(wchar_t) == sizeof(WCHAR), "wchar_t != WCHAR");
return narrow(src.data(), src.length() * sizeof(std::wstring_view::value_type));
}
std::string narrow(std::u16string_view src) {
return narrow(src.data(), src.length() * sizeof(std::u16string_view::value_type));
}
std::string narrow(const void* src, std::size_t in_nb) {
const DWORD flags = WC_ERR_INVALID_CHARS;
const auto in_data = reinterpret_cast<const wchar_t*>(src);
const auto in_nch = convert_input_bytes_to_chars(in_nb);
auto out_nb = ::WideCharToMultiByte(CP_UTF8, flags, in_data, in_nch, NULL, 0, NULL, NULL);
if (out_nb == 0) {
throw error("WideCharToMultiByte", GetLastError());
}
auto out = output_buffer<char>(out_nb);
out_nb = ::WideCharToMultiByte(CP_UTF8, flags, in_data, in_nch, out.data(), out_nb, NULL, NULL);
if (out_nb == 0) {
throw error("WideCharToMultiByte", GetLastError());
}
verify_output(out, out_nb);
return {out.data(), out.size()};
}
} // namespace winapi
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