public async Task DownloadFile(DownloadInfo info)
{
var client = new HttpClient();
client.DefaultRequestHeaders.Range = new RangeHeaderValue(info.Start, ((info.Id + 1) * info.Size) - 1);
using (var stream = await client.GetStreamAsync(info.Url))
using (var output = File.Create($@"./down_{info.Id}.tmp"))
{
await stream.CopyToAsync(output);
}
Console.WriteLine($"{info.Id} : {info.Start} -> {((info.Id + 1) * info.Size) - 1} : Downloaded !");
}
public async Task <bool> DoDownload()
{
HttpResponseMessage response = await client.SendAsync(new HttpRequestMessage(HttpMethod.Head, Url));
if (response.IsSuccessStatusCode)
{
if (response.Content.Headers.ContentLength.HasValue)
{
long fileSize = response.Content.Headers.ContentLength.Value;
int split = (int)(fileSize / DowloadChunkSize);
long rem = fileSize - (split * DowloadChunkSize);
Console.WriteLine($"File is {fileSize} bytes");
Console.WriteLine($"Download will be performe in {split} subdownload of {DowloadChunkSize} bytes");
if (rem > 0)
{
Console.WriteLine($"And one download of {rem} bytes");
}
List <Task> downloadTask = new List <Task>();
for (int downId = 0; downId < split; downId++)
{
DownloadInfo dinfo = new DownloadInfo()
{
Url = Url,
Start = downId * DowloadChunkSize,
Size = DowloadChunkSize,
Id = downId
};
downloadTask.Add(DownloadFile(dinfo));
}
if (rem > 0)
{
DownloadInfo dinfo = new DownloadInfo()
{
Url = Url,
Start = split * DowloadChunkSize,
Size = DowloadChunkSize,
Id = split
};
downloadTask.Add(DownloadFile(dinfo));
}
await Task.WhenAll(downloadTask.ToArray());
if (File.Exists(OutFileName))
{
File.Delete(OutFileName);
}
FileStream f = File.OpenWrite(OutFileName);
for (int downId = 0; downId <= split; downId++)
{
byte[] data = File.ReadAllBytes($@"./down_{downId}.tmp");
f.Write(data, 0, data.Count());
f.Flush();
Console.WriteLine($"{downId} added to master file");
File.Delete($@"./down_{downId}.tmp");
}
f.Close();
return(true);
}
}
return(false);
}