Write and read entity field data

All entity data fields are blob types. You can write up to 1,024 bytes of data to an entity. We recommend that you keep blobs as small as possible because larger sizes will reduce performance. When you write to a blob, you pass SimSpace Weaver a pointer to the data and its length. When you read from a blob, SimSpace Weaver provides you with a pointer and a length to read. All reads must be complete before the app calls Commit(). Pointers returned from a read call are invalidated when the app calls Commit().