private static long GetRangeLength(HttpRange range, long contentLength, out long start, out long end)
{
if (contentLength == 0)
{
start = end = 0;
return 0;
}
start = range.Start ?? 0;
end = range.End ?? (contentLength - 1);
return end - start + 1;
}
private static Task SendRange(HttpRange range, IStaticResponse response, Stream responseStream, IOwinContext ctx)
{
long? length = response.Headers.ContentLength.Value;
if (!length.HasValue || length.Value == 0)
{
SendFullResponse(response, responseStream, ctx);
}
long start, end;
// ReSharper disable PossibleInvalidOperationException
long rangeLength = GetRangeLength(range, length.Value, out start, out end);
// ReSharper restore PossibleInvalidOperationException
if (start < 0 || start >= length.Value || end >= length.Value || rangeLength <= 0)
{
return SendRequestedRangeNotSatisfiable(ctx, responseStream);
}
SetResponseHeaders(Constants.Http.StatusCodes.Successful.PartialContent, response.Headers, ctx.Response,
Constants.Http.Headers.ContentLength);
ctx.Response.Headers.ContentRange.Range = new HttpContentRange(start, end, length.Value);
ctx.Response.Headers.ContentLength.Value = rangeLength;
return SendStreamAsync(responseStream, ctx.Response.Body, start, rangeLength, ctx.CallCancelled);
}
protected void SetRange(HttpRange range)
{
SetSingleValue(range == null ? null : range.ToString());
}