finishSizePrefixed  
  Finalize a buffer, pointing to the given root_table, with the size prefixed.
Parameters
rootTable 
An offset to be added to the buffer.
Finalize a buffer, pointing to the given root_table, with the size prefixed.
Parameters
rootTable 
An offset to be added to the buffer.
fileIdentifier 
A FlatBuffer file identifier to be added to the buffer before root_table.