FtpWebResponse.cs

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using System.IO;
 
namespace System.Net;
 
public class FtpWebResponse : WebResponse, IDisposable
{
    internal sealed class EmptyStream : MemoryStream
    {
        internal EmptyStream()
            : base(Array.Empty<byte>(), writable: false)
        {
        }
    }
 
    internal Stream _responseStream;
 
    private readonly long _contentLength;
 
    private readonly Uri _responseUri;
 
    private FtpStatusCode _statusCode;
 
    private string _statusLine;
 
    private WebHeaderCollection _ftpRequestHeaders;
 
    private readonly DateTime _lastModified;
 
    private readonly string _bannerMessage;
 
    private readonly string _welcomeMessage;
 
    private string _exitMessage;
 
    public override long ContentLength => _contentLength;
 
    public override WebHeaderCollection Headers
    {
        get
        {
            if (_ftpRequestHeaders == null)
            {
                lock (this)
                {
                    if (_ftpRequestHeaders == null)
                    {
                        _ftpRequestHeaders = new WebHeaderCollection();
                    }
                }
            }
            return _ftpRequestHeaders;
        }
    }
 
    public override bool SupportsHeaders => true;
 
    public override Uri ResponseUri => _responseUri;
 
    public FtpStatusCode StatusCode => _statusCode;
 
    public string? StatusDescription => _statusLine;
 
    public DateTime LastModified => _lastModified;
 
    public string? BannerMessage => _bannerMessage;
 
    public string? WelcomeMessage => _welcomeMessage;
 
    public string? ExitMessage => _exitMessage;
 
    internal FtpWebResponse(Stream responseStream, long contentLength, Uri responseUri, FtpStatusCode statusCode, string statusLine, DateTime lastModified, string bannerMessage, string welcomeMessage, string exitMessage)
    {
        _responseStream = responseStream;
        if (responseStream == null && contentLength < 0)
        {
            contentLength = 0L;
        }
        _contentLength = contentLength;
        _responseUri = responseUri;
        _statusCode = statusCode;
        _statusLine = statusLine;
        _lastModified = lastModified;
        _bannerMessage = bannerMessage;
        _welcomeMessage = welcomeMessage;
        _exitMessage = exitMessage;
    }
 
    internal void UpdateStatus(FtpStatusCode statusCode, string statusLine, string exitMessage)
    {
        _statusCode = statusCode;
        _statusLine = statusLine;
        _exitMessage = exitMessage;
    }
 
    public override Stream GetResponseStream()
    {
        Stream stream = null;
        if (_responseStream != null)
        {
            return _responseStream;
        }
        return _responseStream = new EmptyStream();
    }
 
    internal void SetResponseStream(Stream stream)
    {
        if (stream != null && stream != Stream.Null && !(stream is EmptyStream))
        {
            _responseStream = stream;
        }
    }
 
    public override void Close()
    {
        _responseStream?.Close();
    }
}