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The function `find_reference_location()` is used to perform a binary search-like function over the contents of a repository's `$GIT_DIR/packed-refs` file. The search it implements is unlike a standard binary search in that the records it searches over are not of a fixed width, so the comparison must locate the end of a record before comparing it. Extract the core routine of `find_reference_location()` in order to implement a function in the following patch which will find the first location in the `packed-refs` file that *doesn't* match the given pattern. The behavior of `find_reference_location()` is unchanged. Co-authored-by: Jeff King <peff@peff.net> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>