/// <summary>
/// Deserializes an shapes index from the given stream.
/// </summary>
public static ShapesArray CreateFrom(Stream stream, bool copy, out long size, bool hasElevation = false)
{
var initialPosition = stream.Position;
size = 0;
var longBytes = new byte[8];
stream.Read(longBytes, 0, 8);
size += 8;
var indexLength = BitConverter.ToInt64(longBytes, 0);
stream.Read(longBytes, 0, 8);
size += 8;
var coordinatesLength = BitConverter.ToInt64(longBytes, 0);
ArrayBase <ulong> index;
ArrayBase <float> coordinates;
ArrayBase <short> elevation = null;
if (copy)
{ // just create arrays and read the data.
index = Context.ArrayFactory.CreateMemoryBackedArray <ulong>(indexLength);
index.CopyFrom(stream);
size += indexLength * 8;
coordinates = Context.ArrayFactory.CreateMemoryBackedArray <float>(coordinatesLength);
size += coordinatesLength * 4;
coordinates.CopyFrom(stream);
if (hasElevation)
{
elevation = Context.ArrayFactory.CreateMemoryBackedArray <short>(coordinatesLength / 2);
size += coordinatesLength;
elevation.CopyFrom(stream);
}
}
else
{ // create accessors over the exact part of the stream that represents vertices/edges.
var position = stream.Position;
var map1 = new MemoryMapStream(new CappedStream(stream, position, indexLength * 8));
index = new Array <ulong>(map1.CreateUInt64(indexLength));
size += indexLength * 8;
var map2 = new MemoryMapStream(new CappedStream(stream, position + indexLength * 8,
coordinatesLength * 4));
coordinates = new Array <float>(map2.CreateSingle(coordinatesLength));
size += coordinatesLength * 4;
if (hasElevation)
{
var map3 = new MemoryMapStream(new CappedStream(stream, position + indexLength * 8 + coordinatesLength * 4,
coordinatesLength));
elevation = new Array <short>(map3.CreateInt16(coordinatesLength / 2));
size += coordinatesLength;
}
}
// make stream is positioned correctly.
stream.Seek(initialPosition + size, System.IO.SeekOrigin.Begin);
return(new ShapesArray(index, coordinates, elevation));
}
/// <summary>
/// Deserializes an index from the given stream.
/// </summary>
public static Index Deserialize(Stream stream, ArrayProfile profile = null)
{
var bytes = new byte[8];
stream.Read(bytes, 0, 8);
var size = BitConverter.ToInt64(bytes, 0);
ArrayBase <ulong> data;
if (profile == null)
{ // just create arrays and read the data.
data = new MemoryArray <ulong>(size);
data.CopyFrom(stream);
}
else
{ // create accessors over the exact part of the stream that represents vertices/edges.
var position = stream.Position;
var map1 = new MemoryMapStream(new CappedStream(stream, position, size * 8));
data = new Array <ulong>(map1.CreateUInt64(size), profile);
}
return(new Index(data));
}
