MrUploader.FileUpload.CalcNextChunkRanges C# (CSharp) Method

        private void CalcNextChunkRanges()
        {
            BytesUploaded = 0;
            currentChunkStartPos = 0;
            currentChunkEndPos = (currentChunkStartPos + ChunkSize < FileLength ? currentChunkStartPos + ChunkSize : FileLength - 1);
            if (ResponseText != null && ResponseText.Length != 0)
            {
                // We can not check response.StatusCode, see comments in constructor of FileUploadControl
                if (Regex.IsMatch(ResponseText, @"^\d+-\d+/\d+")) // we got 201 response
                // response can be 0-66211/6621184,6554988-6621183/6621184, so we do not include string end in regexp
                {
                    long holeStart = 0, holeEnd = 0;
                    // let's find first hole in ranges
                    foreach(string str in ResponseText.Split(','))
                    {
                        string[] r = str.Split('/')[0].Split('-');
                        long start = long.Parse(r[0]);
                        long end = long.Parse(r[1]);
                        BytesUploaded += end - start;
                        if (holeEnd != 0)
                        {
                            continue;
                        }
                        if (start != 0)
                        {
                            holeEnd = start - 1;
                        }
                        else
                        {
                            holeStart = end + 1;
                        }
                    }
                    currentChunkStartPos = holeStart;
                    if (holeEnd == 0)
                    {
                        holeEnd = FileLength - 1;
                    }
                    currentChunkEndPos = (holeEnd - holeStart < ChunkSize ? holeEnd : currentChunkStartPos + ChunkSize);
                }
                else // we got 200 response
                {
                    BytesUploaded = FileLength;
                }
            }
        }