You may notice that certain values appear to be redundant. For example, ifrmofsbitLayerStart is redundant because it is always equal to (ifrmofsbytLayerStart * 8). In all such cases this redundancy is provided very deliberately. This serves efficiency so that, for example, you can use ifrmofsbitLayerStart in preference to either setting your own variable to (ifrmofsbytLayerStart * 8) or repeatedly using the expression (ifrmofsbytLayerStart * 8).
Here is one other example of redundancy:
ifrmofsbitLayerEnd = ifrmofsbitLayerStart + (inbytLeftInFullLayer*8) ‐ 1