public override List<CalculatedFileSegment> GetCalculatedSegments(
int segmentCount,
RemoteFileInfo remoteFileInfo,
long calculatedSegmentSize,
long residueBytes)
{
return base.GetCalculatedSegments(segmentCount, remoteFileInfo, calculatedSegmentSize, residueBytes);
}
/// <summary>
/// calculate size of segment
/// </summary>
/// <param name="segmentCount"></param>
/// <param name="remoteFileInfo"></param>
/// <returns></returns>
public virtual long CalculateSegmentSize(int segmentCount, RemoteFileInfo remoteFileInfo)
{
if (remoteFileInfo != null)
{
long calculatedSegmentSize = remoteFileInfo.FileSize / (long)segmentCount;
return calculatedSegmentSize;
}
return 0;
}
public void TestMinimumSegmentSizeCalculation()
{
FileSegmentCalculator calculator = new FileSegmentSizeCalculatorWithResidueHelper();
RemoteFileInfo remoteFileInfo = new RemoteFileInfo();
remoteFileInfo.AcceptRanges = true;
remoteFileInfo.FileSize = 1773484;
int segmentCount = 6;
List<CalculatedFileSegment> segments = calculator.GetSegments(segmentCount, remoteFileInfo);
Assert.AreEqual(segments[0].SegmentEndPosition, 295580);
}
public override long CalculateResidueBytes(int segmentCount, RemoteFileInfo remoteFileInfo, long calculatedSegmentSize)
{
if (remoteFileInfo != null)
{
return remoteFileInfo.FileSize - (calculatedSegmentSize * segmentCount);
}
else
{
return 0;
}
}
/// <summary>
/// Method for calculating minimum size for file segment to download
/// </summary>
/// <param name="segmentCount">count of segments</param>
/// <param name="remoteFileInfo">remote file information</param>
/// <returns>List of calulated file segments</returns>
public override List<CalculatedFileSegment> GetSegments(int segmentCount, RemoteFileInfo remoteFileInfo)
{
List<CalculatedFileSegment> calculatedSegments = new List<CalculatedFileSegment>();
if (remoteFileInfo != null)
{
long calculatedSegmentSize = CalculateSegmentSize(segmentCount, remoteFileInfo);
long residueBytes = CalculateResidueBytes(segmentCount, remoteFileInfo, calculatedSegmentSize);
calculatedSegments = GetCalculatedSegments(segmentCount, remoteFileInfo, calculatedSegmentSize, residueBytes);
}
return calculatedSegments;
}
/// <summary>
/// Get calculated segments of download
/// </summary>
/// <param name="segmentCount">count of segments</param>
/// <param name="remoteFileInfo">remote file info</param>
/// <param name="calculatedSegmentSize">size of calculated segment</param>
/// <param name="residueBytes">residue bytes of download</param>
/// <returns></returns>
public virtual List<CalculatedFileSegment> GetCalculatedSegments(
int segmentCount,
RemoteFileInfo remoteFileInfo,
long calculatedSegmentSize,
long residueBytes)
{
List<CalculatedFileSegment> calculatedSegments = new List<CalculatedFileSegment>();
if (remoteFileInfo != null)
{
long startSegmentPosition = 0;
for (int i = 0; i < segmentCount; i++)
{
if (i != segmentCount - 1)
{
if (segmentCount == 1)
{
calculatedSegments.Add(new CalculatedFileSegment(startSegmentPosition, remoteFileInfo.FileSize));
}
else
{
calculatedSegments.Add(new CalculatedFileSegment(
startSegmentPosition,
startSegmentPosition + calculatedSegmentSize));
}
}
if (i == segmentCount - 1)
{
calculatedSegments.Add(new CalculatedFileSegment(
startSegmentPosition,
startSegmentPosition + calculatedSegmentSize + residueBytes));
}
startSegmentPosition = calculatedSegments[calculatedSegments.Count - 1].SegmentEndPosition;
}
}
return calculatedSegments;
}
/// <summary>
/// Method for getting file information
/// </summary>
/// <param name="resourceInfo">link</param>
/// <param name="stream">download stream</param>
/// <returns>information about downloading file</returns>
public RemoteFileInfo GetFileInfo(ResourceInfo resourceInfo, out Stream stream)
{
if (resourceInfo != null)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(resourceInfo.Url);
request.Timeout = 30000;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
RemoteFileInfo result = new RemoteFileInfo();
result.LastModified = response.LastModified;
result.FileSize = response.ContentLength;
result.AcceptRanges = string.Compare(response.Headers["Accept-Ranges"], "bytes", true, CultureInfo.CurrentCulture) == 0;
stream = response.GetResponseStream();
return result;
}
else
{
stream = null;
return null;
}
}
public virtual List<CalculatedFileSegment> GetSegments(int segmentCount, RemoteFileInfo remoteFileInfo)
{
long calculatedSegmentSize = CalculateSegmentSize(segmentCount, remoteFileInfo);
long residueBytes = CalculateResidueBytes(segmentCount, remoteFileInfo, calculatedSegmentSize);
return GetCalculatedSegments(segmentCount, remoteFileInfo, calculatedSegmentSize, residueBytes);
}
/// <summary>
/// calculate residue size bytes after dividing fole on segments
/// </summary>
/// <param name="segmentCount">count of segments</param>
/// <param name="remoteFileInfo">information about remote file</param>
/// <param name="calculatedSegmentSize"></param>
/// <returns></returns>
public virtual long CalculateResidueBytes(int segmentCount, RemoteFileInfo remoteFileInfo, long calculatedSegmentSize)
{
return 0;
}
private static List<CalculatedFileSegment> GetSegmentsFromCalculator()
{
FileSegmentCalculator calculator = new FileSegmentSizeCalculatorWithResidueHelper();
RemoteFileInfo remoteFileInfo = new RemoteFileInfo();
remoteFileInfo.AcceptRanges = true;
remoteFileInfo.FileSize = 4724748;
int segmentCount = 5;
List<CalculatedFileSegment> segments = calculator.GetSegments(segmentCount, remoteFileInfo);
return segments;
}
public override long CalculateSegmentSize(int segmentCount, RemoteFileInfo remoteFileInfo)
{
return base.CalculateSegmentSize(segmentCount, remoteFileInfo);
}
public Downloader Add(
ResourceInfo resourceInfo,
ResourceInfo[] mirrors,
string localFile,
List<FileSegment> segments,
RemoteFileInfo remoteInfo,
bool autoStart,
DateTime createdDateTime,
string fileName)
{
Downloader d = new Downloader(resourceInfo, mirrors, localFile, segments, remoteInfo, createdDateTime, fileName);
Add(d, autoStart);
return d;
}