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bde25c0bc8
Every real Guitar Pro 6 (.gpx) file failed to import with "GPX BCFS sector pointer out of range (malformed file)". A real .gpx's BCFZ-declared decompressed size isn't 0x1000-aligned, so its last (small) container file lands in a partial trailing sector. _parse_bcfs raised whenever a sector read would run past the buffer end, rejecting the whole container before score.gpif could be extracted -- so no GP6 file could be charted in the song editor. (GP7/GP8 .gp files take the ZIP path, not BCFS, which is why this wasn't caught earlier.) Clamp the final sector read to the buffer end (the per-file size field trims the padding anyway), matching canonical GPX readers (alphaTab / PyGuitarPro). A sector whose start is past the end still raises, so the malformed-file guard is preserved. Verified against two real GP6 files -- both now unpack to valid GPIF with all tracks. Adds the previously-missing positive BCFS round-trip coverage: partial-final-sector, multi-file, sector-aligned baseline, and the preserved out-of-range guard. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Co-authored-by: byrongamatos <xasiklas@gmail.com>