mirror of https://github.com/winsw/winsw
49 lines
1.4 KiB
C#
49 lines
1.4 KiB
C#
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using System;
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using System.IO;
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using System.Net;
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using System.Xml;
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namespace winsw
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{
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/// <summary>
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/// Specify the download activities prior to the launch.
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/// This enables self-updating services.
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/// </summary>
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public class Download
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{
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public readonly string From;
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public readonly string To;
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internal Download(XmlNode n)
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{
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From = Environment.ExpandEnvironmentVariables(n.Attributes["from"].Value);
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To = Environment.ExpandEnvironmentVariables(n.Attributes["to"].Value);
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}
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public void Perform()
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{
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WebRequest req = WebRequest.Create(From);
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WebResponse rsp = req.GetResponse();
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FileStream tmpstream = new FileStream(To + ".tmp", FileMode.Create);
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CopyStream(rsp.GetResponseStream(), tmpstream);
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// only after we successfully downloaded a file, overwrite the existing one
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if (File.Exists(To))
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File.Delete(To);
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File.Move(To + ".tmp", To);
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}
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private static void CopyStream(Stream i, Stream o)
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{
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byte[] buf = new byte[8192];
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while (true)
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{
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int len = i.Read(buf, 0, buf.Length);
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if (len <= 0) break;
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o.Write(buf, 0, len);
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}
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i.Close();
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o.Close();
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}
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}
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}
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