public void InitializeRanges(WebResponseRangeInfo rangeInfo)
{
IsRangeRequest = rangeInfo.IsRangeApplied;
if (rangeInfo.IsRangeApplied)
{
RangeBegin = new long[] { rangeInfo.Begin };
RangeEnd = new long[] { rangeInfo.End };
}
}
/// <summary>
/// Validate
/// </summary>
public bool ValidateHeaderRange(WebResponse webResponse, WebResponseRangeInfo rangeInfo)
{
// range is not valid
if (rangeInfo.RangeLength > rangeInfo.DataLength)
{
return(false);
}
// range is not valid
if (rangeInfo.Begin > rangeInfo.End)
{
return(false);
}
// range can not be larger than total data size
if (rangeInfo.End > rangeInfo.DataLength)
{
return(false);
}
return(true);
}
/// <summary>
/// Parses server response indicating returned bytes
/// </summary>
public static WebResponseRangeInfo ParseWebResponseHeaderRange(WebResponse webResponse)
{
var rangeInfo = new WebResponseRangeInfo();
// Initial values
rangeInfo.Begin = 0;
rangeInfo.End = webResponse.ContentLength;
rangeInfo.RangeLength = rangeInfo.End;
rangeInfo.IsRangeApplied = false;
//var dataLength = webResponse.ContentLength;
if (webResponse is HttpWebResponse)
{
// only partial content ollowed range responses
if ((webResponse as HttpWebResponse).StatusCode != HttpStatusCode.PartialContent)
{
rangeInfo.IsRangeApplied = false;
return(rangeInfo);
}
string contentRange = RetrieveHeader(webResponse.Headers[HTTP_HEADER_CONTENT_RANGE], String.Empty);
string contentLength = RetrieveHeader(webResponse.Headers[HTTP_HEADER_CONTENT_LENGTH], String.Empty);
if (contentRange.Length == 0 || contentLength.Length == 0)
{
rangeInfo.IsRangeApplied = false;
return(rangeInfo);
}
else
{
// the header whould be like this
//HTTP/1.1 206 OK
//Content-Range: bytes 500001-54216827/54216828
//Content-Length: 53716827
//Content-Type: application/x-zip-compressed
//Last-Modified: Fri, 24 Jul 2009 21:45:22 GMT
//ETag: "mTkR3PTZIofQXrAY3ZkNzA=="
//Accept-Ranges: bytes
//Binary content of DancingHampsters.zip from byte 500,001 onwards...
rangeInfo.IsRangeApplied = true;
string[] rangeParts = contentRange.Replace("bytes ", "").Split(new char[] { '/' });
if (rangeParts.Length == 2)
{
string[] dataRange = rangeParts[0].Split(new char[] { '-' });
rangeInfo.Begin = Convert.ToInt32(dataRange[0]);
rangeInfo.End = Convert.ToInt64(dataRange[1]);
// and the content length
rangeInfo.DataLength = Convert.ToInt64(rangeParts[1]);
// the range length is the content-length
rangeInfo.RangeLength = Convert.ToInt64(contentLength);
return(rangeInfo);
}
rangeInfo.IsRangeApplied = false;
// invalid header!
return(rangeInfo);
}
}
rangeInfo.IsRangeApplied = false;
return(rangeInfo);
}
