PemEnumerator.cs

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using System;
using System.Security.Cryptography;
 
namespace Internal.Cryptography;
 
internal readonly ref struct PemEnumerator
{
    internal ref struct Enumerator
    {
        internal readonly ref struct PemFieldItem
        {
            private readonly ReadOnlySpan<char> _contents;
 
            private readonly PemFields _pemFields;
 
            public PemFieldItem(ReadOnlySpan<char> contents, PemFields pemFields)
            {
                _contents = contents;
                _pemFields = pemFields;
            }
 
            public void Deconstruct(out ReadOnlySpan<char> contents, out PemFields pemFields)
            {
                contents = _contents;
                pemFields = _pemFields;
            }
        }
 
        private ReadOnlySpan<char> _contents;
 
        private PemFields _pemFields;
 
        public PemFieldItem Current => new PemFieldItem(_contents, _pemFields);
 
        public Enumerator(ReadOnlySpan<char> contents)
        {
            _contents = contents;
            _pemFields = default(PemFields);
        }
 
        public bool MoveNext()
        {
            ReadOnlySpan<char> contents = _contents;
            _contents = contents[_pemFields.Location.End..];
            return PemEncoding.TryFind(_contents, out _pemFields);
        }
    }
 
    private readonly ReadOnlySpan<char> _contents;
 
    public PemEnumerator(ReadOnlySpan<char> contents)
    {
        _contents = contents;
    }
 
    public Enumerator GetEnumerator()
    {
        return new Enumerator(_contents);
    }
}