Wrong byte order for long (64bit) in vtkDataReader/vtkDataWriter
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
When a vtkLongArray is written with the vtkDataWriter on a system where sizeof(long) = 8 the byte order is changed within a block of 8 bytes [0 1 2 3 4 5 6 7] -> [7 6 5 4 3 2 1 0]. But when the data is read back with vtkDataReader it uses a block size of 4 for swapping the byte order for long. This results when writing and reading (as in marshalling/unmarshalling in vtkCommunicator) in an ordering of [4 5 6 7 0 1 2 3]. I do not know if the behaviour of the reader or writer is correct and if an exchange between systems with 32bit and 64bit is even possible. The attached file is an example that should reproduce the explained bug on 64bit systems.