Seek in a file to the section containing the data that we want. We start with a reasonable guess about where in the file the data is located, but we seek up or downstream of that (depending on whether the data at that position is before or after the data that we want), then bisect to pin down where to start loading data from.
path to the datafile
start position of the variant
the approximate byte offset in the file (to within a few hundred bytes) where the required data starts
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