public async Task DownloadLogAsync(HttpListenerRequest request, HttpListenerResponse response, string logName, long limit)
{
string logFileName = logName + ".log";
using (FileStream fS = new FileStream(Path.Combine(ConvertToAbsolutePath(_logFolder), logFileName), FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
response.ContentType = "text/plain";
response.AddHeader("Content-Disposition", "attachment;filename=" + logFileName);
if ((limit > fS.Length) || (limit < 1))
{
limit = fS.Length;
}
OffsetStream oFS = new OffsetStream(fS, 0, limit);
using (Stream s = DnsWebService.GetOutputStream(request, response))
{
await oFS.CopyToAsync(s);
if (fS.Length > limit)
{
byte[] buffer = Encoding.UTF8.GetBytes("####___TRUNCATED___####");
s.Write(buffer, 0, buffer.Length);
}
}
}
}