/// <summary>
/// Copies to the given stream.
/// </summary>
public override long CopyTo(Stream stream)
{
var initialPosition = stream.Position;
stream.Write(BitConverter.GetBytes(_index.Length), 0, 8);
stream.Seek(stream.Position + 8, System.IO.SeekOrigin.Begin); // leave room for the coordinates-size.
// rewrite the coordinates array in the process removing all empty spaces after removing items.
var position = stream.Position;
var coordinatesPosition = position + (_index.Length * 8);
long newPointer = 0;
using (var indexStream = new BinaryWriter(new LimitedStream(stream, position)))
{
using (var coordinatesStream = new BinaryWriter(new LimitedStream(stream, coordinatesPosition)))
{
long pointer;
int size;
for (var i = 0; i < _index.Length; i++)
{
coordinatesStream.SeekBegin(newPointer * 4);
ShapesArray.ExtractPointerAndSize(_index[i], out pointer, out size);
if (size > 0)
{
for (var p = 0; p < size; p++)
{
coordinatesStream.Write(_coordinates[pointer + (p * 2)]);
coordinatesStream.Write(_coordinates[pointer + (p * 2) + 1]);
}
indexStream.SeekBegin(i * 8);
indexStream.Write(ShapesArray.BuildPointerAndSize(newPointer, size));
newPointer += size * 2;
}
else
{
indexStream.SeekBegin(i * 8);
indexStream.Write((ulong)0);
}
}
}
}
// write coordinates size.
stream.Seek(initialPosition + 8, System.IO.SeekOrigin.Begin);
stream.Write(BitConverter.GetBytes(newPointer), 0, 8);
// seek until after.
var sizeInBytes = 16 + (_index.Length * 8) + (newPointer * 4);
stream.Seek(initialPosition + sizeInBytes, System.IO.SeekOrigin.Begin);
return(sizeInBytes);
}
/// <summary>
/// Sets the index and size.
/// </summary>
private void SetPointerAndSize(long id, long pointer, int size)
{
_index[id] = ShapesArray.BuildPointerAndSize(pointer, size);
}