FieldID.cs

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using System.Formats.Asn1;
 
namespace System.Security.Cryptography.Asn1;
 
internal struct FieldID
{
    internal string FieldType;
 
    internal ReadOnlyMemory<byte> Parameters;
 
    internal void Encode(AsnWriter writer)
    {
        Encode(writer, Asn1Tag.Sequence);
    }
 
    internal void Encode(AsnWriter writer, Asn1Tag tag)
    {
        writer.PushSequence(tag);
        try
        {
            writer.WriteObjectIdentifier(FieldType);
        }
        catch (ArgumentException inner)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner);
        }
        try
        {
            writer.WriteEncodedValue(Parameters.Span);
        }
        catch (ArgumentException inner2)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner2);
        }
        writer.PopSequence(tag);
    }
 
    internal static void Decode(ref System.Formats.Asn1.AsnValueReader reader, ReadOnlyMemory<byte> rebind, out System.Security.Cryptography.Asn1.FieldID decoded)
    {
        Decode(ref reader, Asn1Tag.Sequence, rebind, out decoded);
    }
 
    internal static void Decode(ref System.Formats.Asn1.AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory<byte> rebind, out System.Security.Cryptography.Asn1.FieldID decoded)
    {
        try
        {
            DecodeCore(ref reader, expectedTag, rebind, out decoded);
        }
        catch (AsnContentException inner)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner);
        }
    }
 
    private static void DecodeCore(ref System.Formats.Asn1.AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory<byte> rebind, out System.Security.Cryptography.Asn1.FieldID decoded)
    {
        decoded = default(System.Security.Cryptography.Asn1.FieldID);
        System.Formats.Asn1.AsnValueReader asnValueReader = reader.ReadSequence(expectedTag);
        ReadOnlySpan<byte> span = rebind.Span;
        decoded.FieldType = asnValueReader.ReadObjectIdentifier();
        ReadOnlySpan<byte> other = asnValueReader.ReadEncodedValue();
        decoded.Parameters = (span.Overlaps(other, out var elementOffset) ? rebind.Slice(elementOffset, other.Length) : ((ReadOnlyMemory<byte>)other.ToArray()));
        asnValueReader.ThrowIfNotEmpty();
    }
}