def METHOD_NAME(self, fr: FileReporter, analysis: Analysis, outfile: IO[str]) -> None:
    """Produces the lcov data for a single file.
    This currently supports both line and branch coverage,
    however function coverage is not supported.
    """
    self.total += analysis.numbers
    outfile.write("TN:\n")
    outfile.write(f"SF:{fr.relative_filename()}\n")
    source_lines = fr.source().splitlines()
    for covered in sorted(analysis.executed):
        # Note: Coverage.py currently only supports checking *if* a line
        # has been executed, not how many times, so we set this to 1 for
        # nice output even if it's technically incorrect.
        # The lines below calculate a 64-bit encoded md5 hash of the line
        # corresponding to the DA lines in the lcov file, for either case
        # of the line being covered or missed in coverage.py. The final two
        # characters of the encoding ("==") are removed from the hash to
        # allow genhtml to run on the resulting lcov file.
        if source_lines:
            if covered-1 >= len(source_lines):
                break
            line = source_lines[covered-1]
        else:
            line = ""
        outfile.write(f"DA:{covered},1,{line_hash(line)}\n")
    for missed in sorted(analysis.missing):
        assert source_lines
        line = source_lines[missed-1]
        outfile.write(f"DA:{missed},0,{line_hash(line)}\n")
    outfile.write(f"LF:{analysis.numbers.n_statements}\n")
    outfile.write(f"LH:{analysis.numbers.n_executed}\n")
    # More information dense branch coverage data.
    missing_arcs = analysis.missing_branch_arcs()
    executed_arcs = analysis.executed_branch_arcs()
    for block_number, block_line_number in enumerate(
        sorted(analysis.branch_stats().keys())
    ):
        for branch_number, line_number in enumerate(
            sorted(missing_arcs[block_line_number])
        ):
            # The exit branches have a negative line number,
            # this will not produce valid lcov. Setting
            # the line number of the exit branch to 0 will allow
            # for valid lcov, while preserving the data.
            line_number = max(line_number, 0)
            outfile.write(f"BRDA:{line_number},{block_number},{branch_number},-\n")
        # The start value below allows for the block number to be
        # preserved between these two for loops (stopping the loop from
        # resetting the value of the block number to 0).
        for branch_number, line_number in enumerate(
            sorted(executed_arcs[block_line_number]),
            start=len(missing_arcs[block_line_number]),
        ):
            line_number = max(line_number, 0)
            outfile.write(f"BRDA:{line_number},{block_number},{branch_number},1\n")
    # Summary of the branch coverage.
    if analysis.has_arcs():
        branch_stats = analysis.branch_stats()
        brf = sum(t for t, k in branch_stats.values())
        brh = brf - sum(t - k for t, k in branch_stats.values())
        outfile.write(f"BRF:{brf}\n")
        outfile.write(f"BRH:{brh}\n")
    outfile.write("end_of_record\n")