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Add Windows wide char path support
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mandreyel
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commit
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@ -71,8 +71,8 @@ int main()
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```
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However, mio does not check whether the provided file descriptor has the same access permissions as the desired mapping, so the mapping may fail. Such errors are reported via the `std::error_code` out parameter that is passed to the mapping function.
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**WINDOWS USERS**: This library doesn't support the use of wide character
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types for functions where character strings are expected (e.g. path parameters).
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**WINDOWS USERS**: This library *does* support the use of wide character types
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for functions where character strings are expected (e.g. path parameters).
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### Example
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@ -38,18 +38,53 @@ namespace mio {
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namespace detail {
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#ifdef _WIN32
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/** Returns the 4 upper bytes of a 8-byte integer. */
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namespace win {
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/** Returns the 4 upper bytes of an 8-byte integer. */
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inline DWORD int64_high(int64_t n) noexcept
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{
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return n >> 32;
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}
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/** Returns the 4 lower bytes of a 8-byte integer. */
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/** Returns the 4 lower bytes of an 8-byte integer. */
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inline DWORD int64_low(int64_t n) noexcept
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{
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return n & 0xffffffff;
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}
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#endif
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template<
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typename String,
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typename = typename std::enable_if<
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std::is_same<typename char_type<String>::type, char>::value
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>::type
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> file_handle_type open_file_helper(const String& path, const access_mode mode)
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{
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return ::CreateFileA(c_str(path),
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mode == access_mode::read ? GENERIC_READ : GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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0,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL,
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0);
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}
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template<typename String>
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typename std::enable_if<
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std::is_same<typename char_type<String>::type, wchar_t>::value,
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file_handle_type
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>::type open_file_helper(const String& path, const access_mode mode)
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{
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return ::CreateFileW(c_str(path),
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mode == access_mode::read ? GENERIC_READ : GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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0,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL,
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0);
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}
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} // win
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#endif // _WIN32
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/**
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* Returns the last platform specific system error (errno on POSIX and
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@ -67,8 +102,8 @@ inline std::error_code last_error() noexcept
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}
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template<typename String>
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file_handle_type open_file(const String& path,
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const access_mode mode, std::error_code& error)
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file_handle_type open_file(const String& path, const access_mode mode,
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std::error_code& error)
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{
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error.clear();
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if(detail::empty(path))
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@ -77,13 +112,7 @@ file_handle_type open_file(const String& path,
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return invalid_handle;
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}
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#ifdef _WIN32
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const auto handle = ::CreateFileA(c_str(path),
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mode == access_mode::read ? GENERIC_READ : GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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0,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL,
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0);
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const auto handle = win::open_file_helper(path, mode);
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#else // POSIX
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const auto handle = ::open(c_str(path),
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mode == access_mode::read ? O_RDONLY : O_RDWR);
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@ -138,8 +167,8 @@ inline mmap_context memory_map(const file_handle_type file_handle, const int64_t
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file_handle,
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0,
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mode == access_mode::read ? PAGE_READONLY : PAGE_READWRITE,
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int64_high(max_file_size),
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int64_low(max_file_size),
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win::int64_high(max_file_size),
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win::int64_low(max_file_size),
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0);
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if(file_mapping_handle == invalid_handle)
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{
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@ -149,8 +178,8 @@ inline mmap_context memory_map(const file_handle_type file_handle, const int64_t
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char* mapping_start = static_cast<char*>(::MapViewOfFile(
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file_mapping_handle,
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mode == access_mode::read ? FILE_MAP_READ : FILE_MAP_WRITE,
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int64_high(aligned_offset),
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int64_low(aligned_offset),
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win::int64_high(aligned_offset),
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win::int64_low(aligned_offset),
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length_to_map));
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if(mapping_start == nullptr)
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{
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@ -26,17 +26,79 @@
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namespace mio {
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namespace detail {
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template <typename String>
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struct is_c_str
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template<
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typename S,
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typename C = typename std::decay<S>::type,
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typename = decltype(std::declval<C>().data()),
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typename = typename std::enable_if<
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std::is_same<typename C::value_type, char>::value
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#ifdef _WIN32
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|| std::is_same<typename C::value_type, wchar_t>::value
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#endif
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>::type
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> struct char_type_helper {
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using type = typename C::value_type;
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};
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template<class T>
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struct char_type {
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using type = typename char_type_helper<T>::type;
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};
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// TODO: can we avoid this brute force approach?
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template<>
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struct char_type<char*> {
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using type = char;
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};
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template<>
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struct char_type<const char*> {
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using type = char;
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};
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template<size_t N>
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struct char_type<char[N]> {
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using type = char;
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};
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template<size_t N>
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struct char_type<const char[N]> {
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using type = char;
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};
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#ifdef _WIN32
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template<>
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struct char_type<wchar_t*> {
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using type = wchar_t;
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};
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template<>
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struct char_type<const wchar_t*> {
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using type = wchar_t;
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};
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template<size_t N>
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struct char_type<wchar_t[N]> {
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using type = wchar_t;
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};
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template<size_t N>
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struct char_type<const wchar_t[N]> {
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using type = wchar_t;
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};
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#endif // _WIN32
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template<typename CharT, typename S>
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struct is_c_str_helper
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{
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static constexpr bool value = std::is_same<
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char*,
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CharT*,
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// TODO: I'm so sorry for this... Can this be made cleaner?
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typename std::add_pointer<
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typename std::remove_cv<
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typename std::remove_pointer<
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typename std::decay<
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String
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S
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>::type
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>::type
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>::type
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@ -44,11 +106,35 @@ struct is_c_str
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>::value;
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};
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template<typename S>
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struct is_c_str
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{
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static constexpr bool value = is_c_str_helper<char, S>::value;
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};
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#ifdef _WIN32
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template<typename S>
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struct is_c_wstr
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{
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static constexpr bool value = is_c_str_helper<wchar_t, S>::value;
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};
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#endif // _WIN32
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template<typename S>
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struct is_c_str_or_c_wstr
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{
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static constexpr bool value = is_c_str<S>::value
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#ifdef _WIN32
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|| is_c_wstr<S>::value
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#endif
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;
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};
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template<
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typename String,
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typename = decltype(std::declval<String>().data()),
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typename = typename std::enable_if<!is_c_str<String>::value>::type
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> const char* c_str(const String& path)
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typename = typename std::enable_if<!is_c_str_or_c_wstr<String>::value>::type
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> const typename char_type<String>::type* c_str(const String& path)
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{
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return path.data();
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}
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@ -56,7 +142,7 @@ template<
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template<
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typename String,
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typename = decltype(std::declval<String>().empty()),
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typename = typename std::enable_if<!is_c_str<String>::value>::type
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typename = typename std::enable_if<!is_c_str_or_c_wstr<String>::value>::type
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> bool empty(const String& path)
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{
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return path.empty();
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@ -64,15 +150,15 @@ template<
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template<
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typename String,
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typename = typename std::enable_if<is_c_str<String>::value>::type
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> const char* c_str(String path)
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typename = typename std::enable_if<is_c_str_or_c_wstr<String>::value>::type
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> const typename char_type<String>::type* c_str(String path)
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{
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return path;
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}
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template<
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typename String,
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typename = typename std::enable_if<is_c_str<String>::value>::type
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typename = typename std::enable_if<is_c_str_or_c_wstr<String>::value>::type
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> bool empty(String path)
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{
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return !path || (*path == 0);
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@ -98,7 +98,7 @@ int main()
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}
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{
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// Make sure custom types compile.
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// Make sure these compile.
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mio::ummap_source _1;
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mio::shared_ummap_source _2;
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// Make sure shared_mmap mapping compiles as all testing was done on
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@ -106,6 +106,16 @@ int main()
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mio::shared_mmap_source _3(path, 0, mio::map_entire_file);
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auto _4 = mio::make_mmap_source(path, error);
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auto _5 = mio::make_mmap<mio::shared_mmap_source>(path, 0, mio::map_entire_file, error);
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#ifdef _WIN32
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const wchar_t* wpath1 = L"dasfsf";
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auto _6 = mio::make_mmap_source(wpath1, error);
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mio::mmap_source _7;
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_7.map(wpath1, error);
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const std::wstring wpath2 = wpath1;
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auto _8 = mio::make_mmap_source(wpath2, error);
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mio::mmap_source _9;
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_9.map(wpath1, error);
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#endif
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}
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std::printf("all tests passed!\n");
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