AttributeAsn.cs

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using System.Collections.Generic;
using System.Formats.Asn1;
 
namespace System.Security.Cryptography.Asn1;
 
internal struct AttributeAsn
{
    internal string AttrType;
 
    internal ReadOnlyMemory<byte>[] AttrValues;
 
    internal void Encode(AsnWriter writer)
    {
        Encode(writer, Asn1Tag.Sequence);
    }
 
    internal void Encode(AsnWriter writer, Asn1Tag tag)
    {
        writer.PushSequence(tag);
        try
        {
            writer.WriteObjectIdentifier(AttrType);
        }
        catch (ArgumentException inner)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner);
        }
        writer.PushSetOf();
        for (int i = 0; i < AttrValues.Length; i++)
        {
            try
            {
                writer.WriteEncodedValue(AttrValues[i].Span);
            }
            catch (ArgumentException inner2)
            {
                throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner2);
            }
        }
        writer.PopSetOf();
        writer.PopSequence(tag);
    }
 
    internal static void Decode(ref System.Formats.Asn1.AsnValueReader reader, ReadOnlyMemory<byte> rebind, out System.Security.Cryptography.Asn1.AttributeAsn 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.AttributeAsn 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.AttributeAsn decoded)
    {
        decoded = default(System.Security.Cryptography.Asn1.AttributeAsn);
        System.Formats.Asn1.AsnValueReader asnValueReader = reader.ReadSequence(expectedTag);
        ReadOnlySpan<byte> span = rebind.Span;
        decoded.AttrType = asnValueReader.ReadObjectIdentifier();
        System.Formats.Asn1.AsnValueReader asnValueReader2 = asnValueReader.ReadSetOf();
        List<ReadOnlyMemory<byte>> list = new List<ReadOnlyMemory<byte>>();
        while (asnValueReader2.HasData)
        {
            ReadOnlySpan<byte> other = asnValueReader2.ReadEncodedValue();
            int elementOffset;
            ReadOnlyMemory<byte> item = (span.Overlaps(other, out elementOffset) ? rebind.Slice(elementOffset, other.Length) : ((ReadOnlyMemory<byte>)other.ToArray()));
            list.Add(item);
        }
        decoded.AttrValues = list.ToArray();
        asnValueReader.ThrowIfNotEmpty();
    }
}