Compute the SourceFingerprint for a source buffer. Touches at most 8 + 2*HEAD_TAIL_BYTES + INTERIOR_WINDOWS*INTERIOR_WINDOW_BYTES (~160KB) regardless of file size, so it is constant-time in the file length.
8 + 2*HEAD_TAIL_BYTES + INTERIOR_WINDOWS*INTERIOR_WINDOW_BYTES
Compute the SourceFingerprint for a source buffer. Touches at most
8 + 2*HEAD_TAIL_BYTES + INTERIOR_WINDOWS*INTERIOR_WINDOW_BYTES(~160KB) regardless of file size, so it is constant-time in the file length.