// Decodes the faces, returning true on success.
public bool Decode(int num_vertices, Decoder decoder)
{
int num_faces_parsed = 0;
while (num_faces_parsed < num_vertices)
{
if (!FaceRun.Decode(decoder, out var face_run))
{
return(false);
}
faces_.Add(face_run);
num_faces_parsed += face_run.Count;
}
return(true);
}
public static bool Decode(Decoder decoder, out FaceRun fr)
{
fr = null;
if (!decoder.TryGetVarUInt64(out var face_and_count))
{
return(false);
}
var face = (int)(face_and_count % S2CellId.kNumFaces);
// Make sure large counts don't wrap on malicious or random input.
UInt64 count64 = face_and_count / S2CellId.kNumFaces;
var count = (int)count64;
var res = count > 0 && (UInt64)count == count64;
if (!res)
{
return(false);
}
fr = new FaceRun(face, count);
return(true);
}