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gh-157509: Avoid a tell() per line when indexing mbox, MMDF and Babyl files - #157543
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Track line offsets in _generate_toc() with len(line) instead of calling tell(), which is a system call, for every line. Also compute the MMDF and Babyl separator bytes once instead of per line. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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By replacing
tell()with a simple counternext_posand hosting separator construction out of the look performance of reading a mailbox is improved by a factor 2x.