AsnCharacterStringEncodings.cs

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using System.Text;
 
namespace System.Formats.Asn1;
 
internal static class AsnCharacterStringEncodings
{
    private static readonly Encoding s_utf8Encoding = new UTF8Encoding(encoderShouldEmitUTF8Identifier: false, throwOnInvalidBytes: true);
 
    private static readonly Encoding s_bmpEncoding = new BMPEncoding();
 
    private static readonly Encoding s_ia5Encoding = new IA5Encoding();
 
    private static readonly Encoding s_visibleStringEncoding = new VisibleStringEncoding();
 
    private static readonly Encoding s_numericStringEncoding = new NumericStringEncoding();
 
    private static readonly Encoding s_printableStringEncoding = new PrintableStringEncoding();
 
    private static readonly Encoding s_t61Encoding = new T61Encoding();
 
    internal static Encoding GetEncoding(UniversalTagNumber encodingType)
    {
        return encodingType switch
        {
            UniversalTagNumber.UTF8String => s_utf8Encoding, 
            UniversalTagNumber.NumericString => s_numericStringEncoding, 
            UniversalTagNumber.PrintableString => s_printableStringEncoding, 
            UniversalTagNumber.IA5String => s_ia5Encoding, 
            UniversalTagNumber.VisibleString => s_visibleStringEncoding, 
            UniversalTagNumber.BMPString => s_bmpEncoding, 
            UniversalTagNumber.TeletexString => s_t61Encoding, 
            _ => throw new ArgumentOutOfRangeException("encodingType", encodingType, null), 
        };
    }
}