void UseStream(string input, string output, long startOffset, long endOffset, string customMessage, CancellationToken token, bool isStream)
{
token.ThrowIfCancellationRequested();
long contentLength;
FileInfo fileinfo = new FileInfo(output);
long existingLength = isStream ? localStream.Length : fileinfo.Exists ? fileinfo.Length : 0;
HttpRequestMessage request = new HttpRequestMessage()
{
RequestUri = new Uri(input)
};
request.Headers.TryAddWithoutValidation("User-Agent", App.UserAgent);
request.Headers.Range = (startOffset != -1 && endOffset != -1) ?
new RangeHeaderValue(startOffset, endOffset):
new RangeHeaderValue(existingLength, null);
HttpResponseMessage response = httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token).GetAwaiter().GetResult();
if (!((response.Content.Headers.ContentRange.Length ?? 0) == existingLength))
{
using (ThrowUnacceptableStatusCode(response))
{
contentLength = (startOffset != -1 && endOffset != -1) ?
endOffset - startOffset :
existingLength + (response.Content.Headers.ContentRange.Length - response.Content.Headers.ContentRange.From) ?? 0;
resumabilityStatus = new DownloadStatusChanged((int)response.StatusCode == 206);
if (!isStream)
{
localStream = fileinfo.Open(resumabilityStatus.ResumeSupported ? FileMode.Append : FileMode.Create, FileAccess.Write);
}
OnResumabilityChanged(resumabilityStatus);
ReadRemoteStream(
response,
localStream,
existingLength,
contentLength,
customMessage,
token
);
response.Dispose();
}
}
else
{
#if DEBUG
Console.WriteLine($"File download for {input} is already completed! Skipping...");
#endif
}
}
protected virtual void OnResumabilityChanged(DownloadStatusChanged e) => ResumablityChanged?.Invoke(this, e);