namespace System.Formats.Asn1 { internal abstract class SpanBasedEncoding : Encoding { protected SpanBasedEncoding(); protected abstract int GetBytes(ReadOnlySpan<char> chars, Span<byte> bytes, bool write); protected abstract int GetChars(ReadOnlySpan<byte> bytes, Span<char> chars, bool write); public new int GetByteCount(ReadOnlySpan<char> chars); public new int GetCharCount(ReadOnlySpan<byte> bytes); } }