68 lines
2.3 KiB
C#
68 lines
2.3 KiB
C#
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using System;
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using System.Collections.Generic;
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using FluentFTP;
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namespace FluentFTP.Extensions {
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/// <summary>
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/// Implementation of the non-standard XCRC command
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/// </summary>
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public static class XCRC {
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delegate string AsyncGetXCRC(string path);
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static Dictionary<IAsyncResult, AsyncGetXCRC> m_asyncmethods = new Dictionary<IAsyncResult, AsyncGetXCRC>();
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/// <summary>
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/// Get the CRC value of the specified file. This is a non-standard extension of the protocol
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/// and may throw a FtpCommandException if the server does not support it.
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/// </summary>
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/// <param name="client">FtpClient object</param>
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/// <param name="path">The path of the file you'd like the server to compute the CRC value for.</param>
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/// <returns>The response from the server, typically the CRC value. FtpCommandException thrown on error</returns>
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public static string GetXCRC(this FtpClient client, string path) {
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FtpReply reply;
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if (!(reply = client.Execute("XCRC {0}", path)).Success)
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throw new FtpCommandException(reply);
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return reply.Message;
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}
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/// <summary>
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/// Asynchronusly retrieve a CRC hash. The XCRC command is non-standard
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/// and not guaranteed to work.
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/// </summary>
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/// <param name="client">FtpClient Object</param>
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/// <param name="path">Full or relative path to remote file</param>
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/// <param name="callback">AsyncCallback</param>
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/// <param name="state">State Object</param>
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/// <returns>IAsyncResult</returns>
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public static IAsyncResult BeginGetXCRC(this FtpClient client, string path, AsyncCallback callback, object state) {
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AsyncGetXCRC func = new AsyncGetXCRC(client.GetXCRC);
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IAsyncResult ar = func.BeginInvoke(path, callback, state); ;
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lock (m_asyncmethods) {
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m_asyncmethods.Add(ar, func);
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}
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return ar;
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}
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/// <summary>
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/// Ends an asynchronous call to BeginGetXCRC()
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/// </summary>
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/// <param name="ar">IAsyncResult returned from BeginGetXCRC()</param>
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/// <returns>The CRC hash of the specified file.</returns>
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public static string EndGetXCRC(IAsyncResult ar) {
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AsyncGetXCRC func = null;
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lock (m_asyncmethods) {
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if (!m_asyncmethods.ContainsKey(ar))
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throw new InvalidOperationException("The specified IAsyncResult was not found in the collection.");
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func = m_asyncmethods[ar];
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m_asyncmethods.Remove(ar);
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}
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return func.EndInvoke(ar);
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}
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}
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}
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