/// <summary>
/// read in the next index descriptor, and pass out the length.
/// this assumes that the position of the filestream is at the start of an index.
/// </summary>
/// <param name="fs"></param>
/// <returns></returns>
public static RawIndex ReadNextIndexBlock(Stream fs, out int length)
{
// read in the length of the index data
length = readNextIndexDataLength(fs);
// read in the block of index data:
byte[] idxBlock = ReadBuffer(fs, length);
// deserialize it:
return(RawIndex.FromByteArray(idxBlock));
}
