update

include/fast_io_hosted/filesystem/native.h

@@ -10,6 +10,7 @@
 
 #if (defined(_WIN32) || defined(__CYGWIN__))
 #if defined(_WIN32_WINDOWS)
+#include "../../fast_io_dsal/string.h"
 #include "win9x.h"
 #include "win9x_at.h"
 #else

include/fast_io_hosted/filesystem/win9x.h

@@ -1 +1,100 @@
 #pragma once
+
+namespace fast_io
+{
+
+struct win9x_DIR
+{
+	void *d_handle{};
+	file_type d_type{};
+	::std::uint_least64_t d_ino{};
+	::fast_io::string path{};
+};
+
+namespace win32::details
+{
+inline ::fast_io::string get_file_full_path_from_path_handle(void *fhandle)
+{
+	char pszFilename[261];
+
+	void *hFileMap{::fast_io::win32::CreateFileMappingA(fhandle, nullptr, 0x10000000 | 0x02, 0, 1, nullptr)};
+	if (!hFileMap) [[unlikely]]
+	{
+		throw_win32_error();
+	}
+	handle_guard hg1{hFileMap};
+
+	// Create a file mapping to get the file name.
+	void *pMem{::fast_io::win32::MapViewOfFile(hFileMap, 0x04, 0, 0, 1)};
+	if (!pMem) [[unlikely]]
+	{
+		throw_win32_error();
+	}
+
+	if (!
+#if !defined(_WIN32_WINNT) || _WIN32_WINNT >= 0x601
+		::fast_io::win32::K32GetMappedFileNameA(
+#else
+		::fast_io::win32::GetMappedFileNameA(
+#endif
+			reinterpret_cast<void *>(static_cast<::std::ptrdiff_t>(-1)),
+			pMem,
+			pszFilename,
+			260)) [[unlikely]]
+	{
+		throw_win32_error();
+	}
+	map_guard mg1{pMem};
+
+	mg1.clear();
+	hg1.clear();
+
+	// change nt path to dos path (9x)
+	auto address_begin{pszFilename};
+
+	// change nt path to dos path
+	auto k32_module{::fast_io::win32::GetModuleHandleA("Kernel32.dll")};
+	if (k32_module)
+	{
+		using QueryDosDeviceA_t = ::std::uint_least32_t (*)(char const *, char *, ::std::uint_least32_t) noexcept;
+
+		// win95 may not have this function, need check (?)
+		auto QueryDosDeviceA_p{reinterpret_cast<QueryDosDeviceA_t>(::fast_io::win32::GetProcAddress(k32_module, "QueryDosDeviceA"))};
+		if (QueryDosDeviceA_p)
+		{
+			if (pszFilename[0] == '\\')
+			{
+				char DosDevice[4]{0, ':', 0, 0};
+				char NtPath[64];
+				char *RetStr{};
+				::std::size_t NtPathLen{};
+				for (char i{65}; i < static_cast<char>(26 + 65); i++)
+				{
+					DosDevice[0] = i;
+					if (QueryDosDeviceA_p(DosDevice, NtPath, 64))
+					{
+						NtPathLen = ::fast_io::cstr_len(NtPath);
+
+						if (::fast_io::freestanding::my_memcmp(pszFilename, NtPath, NtPathLen * sizeof(char)) == 0) [[unlikely]]
+						{
+							goto next2;
+						}
+					}
+				}
+				throw_win32_error(0x3);
+			next2:
+				address_begin += NtPathLen - 2;
+				address_begin[0] = DosDevice[0];
+				address_begin[1] = ':';
+			}
+		}
+	}
+}
+
+} // namespace win32::details
+
+inline win9x_DIR *set_win9x_dirent(win9x_DIR *entry, bool start)
+{
+}
+
+} // namespace fast_io