/// <summary>
/// Creates a new SeekTable base on the provided binary data.
/// </summary>
/// <param name="data"></param>
public override void LoadBlockData(byte[] data)
{
UInt32 numberOfSeekpoints;
SeekPoint newSeekPoint;
numberOfSeekpoints = this.Header.MetaDataBlockLength / SEEKPOINT_SIZE;
for (int i = 0; i < numberOfSeekpoints; i++)
{
newSeekPoint = new SeekPoint(BinaryDataHelper.GetDataSubset(data, i * (int)SEEKPOINT_SIZE, (int)SEEKPOINT_SIZE));
// We should keep in mind that the placeholder seekpoints aren't actually added to the list but are kept only as a
// count in this.SeekPoints.Placeholders
this.SeekPoints.Add(newSeekPoint);
}
}
/// <summary>
/// Writes the data describing this metadata block to the given stream.
/// </summary>
/// <param name="targetStream">Stream to write the data to.</param>
public override void WriteBlockData(Stream targetStream)
{
this.Header.MetaDataBlockLength = (uint)(SeekPoints.Count + SeekPoints.Placeholders) * SEEKPOINT_SIZE;
this.Header.WriteHeaderData(targetStream);
foreach (var seekPoint in this.SeekPoints)
{
seekPoint.Value.WriteData(targetStream);
}
SeekPoint placeholder = new SeekPoint();
placeholder.FirstSampleNumber = ulong.MaxValue;
for (int i = 0; i < SeekPoints.Placeholders; i++)
{
// Here, we shall actually physically write placeholders, even though they don't really exist in memory ...
// Again: this is a weird unnatural way to support multiple placeholders and it should be changed at some point!
placeholder.WriteData(targetStream);
}
}