TBL: consolidate repeated logic blocks

[jphickey]

Is your feature request related to a problem? Please describe.
The TBL module suffers from having many functions with high complexity levels, making it difficult to maintain.

There are a number of "low-hanging fruits" of repeated code that should be consolidated into common routines:

• Getting the Active/Inactive buffer
• Dealing with the "LoadInProgress" buffer (allocating it, freeing it, etc)

Describe the solution you'd like
Write internal helper functions for these logic blocks, and call those functions instead of repeating the logic everywhere.

Additional context
This should help with code complexity metrics and make the code more maintainable.

Requester Info
Joseph Hickey, Vantage Systems, Inc.