private const int MaxKeyLength = 255;
private const string InvariantUtcStandardDisplayName = "Coordinated Universal Time";
- private static readonly Dictionary<string, string> s_fileMuiPathCache = new();
- private static readonly TimeZoneInfo s_utcTimeZone = CreateUtcTimeZone(); // must be initialized after s_fileMuiPathCache
-
private sealed partial class CachedData
{
private static TimeZoneInfo GetCurrentOneYearLocal()
}
}
- /// <summary>
- /// Helper function for getting the MUI path for a given resource and culture, using a cache to prevent duplicating work.
- /// Searches the installed OS languages for either an exact matching culture, or one that has the same parent.
- /// If not found, uses the preferred default OS UI language, to align with prior behavior.
- /// </summary>
- private static string GetCachedFileMuiPath(string filePath, CultureInfo cultureInfo)
- {
- string? result;
- string cacheKey = $"{cultureInfo.Name};{filePath}";
-
- lock (s_fileMuiPathCache)
- {
- if (s_fileMuiPathCache.TryGetValue(cacheKey, out result))
- {
- return result;
- }
- }
-
- result = GetFileMuiPath(filePath, cultureInfo);
-
- lock (s_fileMuiPathCache)
- {
- s_fileMuiPathCache.TryAdd(cacheKey, result);
- }
-
- return result;
- }
/// <summary>
- /// Helper function for getting the MUI path for a given resource and culture.
- /// Searches the installed OS languages for either an exact matching culture, or one that has the same parent.
- /// If not found, uses the preferred default OS UI language, to align with prior behavior.
- /// </summary>
- private static unsafe string GetFileMuiPath(string filePath, CultureInfo cultureInfo)
- {
- char* fileMuiPath = stackalloc char[Interop.Kernel32.MAX_PATH + 1];
- char* language = stackalloc char[Interop.Kernel32.LOCALE_NAME_MAX_LENGTH + 1];
- uint fileMuiPathLength = Interop.Kernel32.MAX_PATH;
- uint languageLength = Interop.Kernel32.LOCALE_NAME_MAX_LENGTH;
- ulong enumerator = 0;
-
- while (true)
- {
- // Search all installed languages. The enumerator is re-used between loop iterations.
- language[0] = '\0';
- bool succeeded = Interop.Kernel32.GetFileMUIPath(
- Interop.Kernel32.MUI_USE_INSTALLED_LANGUAGES,
- filePath, language, ref languageLength,
- fileMuiPath, ref fileMuiPathLength, ref enumerator);
- fileMuiPath[Interop.Kernel32.MAX_PATH] = '\0';
-
- if (!succeeded)
- {
- // Recurse to search using the parent of the desired culture.
- if (cultureInfo.Parent.Name != string.Empty)
- {
- return GetFileMuiPath(filePath, cultureInfo.Parent);
- }
-
- // Final fallback, using the preferred installed UI language.
- enumerator = 0;
- language[0] = '\0';
- succeeded = Interop.Kernel32.GetFileMUIPath(
- Interop.Kernel32.MUI_USER_PREFERRED_UI_LANGUAGES,
- filePath, language, ref languageLength,
- fileMuiPath, ref fileMuiPathLength, ref enumerator);
- fileMuiPath[Interop.Kernel32.MAX_PATH] = '\0';
-
- if (succeeded)
- {
- return new string(fileMuiPath);
- }
-
- return string.Empty;
- }
-
- // Lookup succeeded. Check for exact match to the desired culture.
- language[Interop.Kernel32.LOCALE_NAME_MAX_LENGTH] = '\0';
- ReadOnlySpan<char> lang = MemoryMarshal.CreateReadOnlySpanFromNullTerminated(language);
- if (lang.Equals(cultureInfo.Name, StringComparison.OrdinalIgnoreCase))
- {
- return new string(fileMuiPath);
- }
-
- // Check for match of any parent of the language returned to the desired culture.
- var ci = CultureInfo.GetCultureInfo(lang.ToString());
- while (ci.Parent.Name != string.Empty)
- {
- if (ci.Parent.Name.Equals(cultureInfo.Name, StringComparison.OrdinalIgnoreCase))
- {
- return new string(fileMuiPath);
- }
-
- ci = ci.Parent;
- }
-
- // Not found yet. Continue with next iteration.
- }
- }
-
- /// <summary>
- /// Helper function for retrieving a localized string resource via MUI.
- /// The function expects a string in the form: "@resource.dll, -123"
- ///
- /// "resource.dll" is a language-neutral portable executable (LNPE) file in
- /// the %windir%\system32 directory. The OS is queried to find the best-fit
- /// localized resource file for this LNPE (ex: %windir%\system32\en-us\resource.dll.mui).
- /// If a localized resource file exists, we LoadString resource ID "123" and
- /// return it to our caller.
+ /// Try to find the time zone resources Dll matching the CurrentUICulture or one of its parent cultures.
+ /// We try to check of such resource module e.g. %windir%\system32\[UI Culture Name]\tzres.dll.mui exist.
+ /// If a localized resource file exists, we LoadString resource with the id specified inside resource input
+ /// string and and return it to our caller.
/// </summary>
private static string GetLocalizedNameByMuiNativeResource(string resource)
{
return string.Empty;
}
- // Use the current UI culture when culture not specified
- CultureInfo cultureInfo = CultureInfo.CurrentUICulture;
-
// parse "@tzres.dll, -100"
//
// filePath = "C:\Windows\System32\tzres.dll"
return string.Empty;
}
- string filePath;
+ // Get the resource ID
+ if (!int.TryParse(resources[1], NumberStyles.Integer, CultureInfo.InvariantCulture, out int resourceId))
+ {
+ return string.Empty;
+ }
+ resourceId = -resourceId;
+
+ // Use the current UI culture when culture not specified
+ CultureInfo cultureInfo = CultureInfo.CurrentUICulture;
// get the path to Windows\System32
string system32 = Environment.SystemDirectory;
- // trim the string "@tzres.dll" => "tzres.dll"
- ReadOnlySpan<char> tzresDll = resources[0].AsSpan().TrimStart('@');
+ // trim the string "@tzres.dll" to "tzres.dll" and append the "mui" file extension to it.
+ string tzresDll = $"{resources[0].AsSpan().TrimStart('@')}.mui";
try
{
- filePath = Path.Join(system32, tzresDll);
+ while (cultureInfo.Name.Length != 0)
+ {
+ string filePath = Path.Join(system32, cultureInfo.Name, tzresDll);
+ if (File.Exists(filePath))
+ {
+ // Finally, get the resource from the resource path
+ return GetLocalizedNameByNativeResource(filePath, resourceId);
+ }
+
+ cultureInfo = cultureInfo.Parent;
+ }
}
catch (ArgumentException)
{
// there were probably illegal characters in the path
- return string.Empty;
- }
-
- // Get the MUI File Path
- string fileMuiPath = GetCachedFileMuiPath(filePath, cultureInfo);
- if (fileMuiPath == string.Empty)
- {
- // not likely, but we could not resolve a MUI path
- return string.Empty;
}
- // Get the resource ID
- if (!int.TryParse(resources[1], NumberStyles.Integer, CultureInfo.InvariantCulture, out int resourceId))
- {
- return string.Empty;
- }
- resourceId = -resourceId;
-
- // Finally, get the resource from the resource path
- return GetLocalizedNameByNativeResource(fileMuiPath, resourceId);
+ return string.Empty;
}
/// <summary>
projects / platform / upstream / dotnet / runtime.git / commitdiff