eeu il Name Intersection Index

eeu.il — Name / Intersection Index

Status: ✅ Cracked · 39 MB · NOT_COMPRESSED

A lightweight index that lets you look up an eeu.rd record by name without scanning the whole 590MB road file.

Layout

• Same 94-byte header as every NOT_COMPRESSED file.
• Variable-length entries: [11-byte prefix][ASCII name][0x00].
• bytes[0:4] of the prefix (little-endian uint32) is a verified exact record index into eeu.rd — it points at that same entry's name. Confirmed by decoding 20 real entries and cross-checking against eeu.rd (this corrected an earlier off-by-one guess from an older session).
• The remaining 7 prefix bytes are unresolved. When the GUI tool appends a new .il entry, they're best-effort copied from a nearby similar entry. eeu.mod's own schema names one of them a vnodeID ("virtual node id") field — a promising lead for the long-standing GLOBAL routing-graph topology node-id↔coordinate mapping problem (distinct from the already-cracked per-tile local vertex adjacency). A later session, from the firmware side (README §2.6): found a complete, real, named resolution pipeline for this exact id — db_vid_get_map_id_V000/db_vid_get_pcl_id_V000 → db_find_node/ db_node → a real VNode struct → readNodeMP0 reads it from an .mp0 MAP_COMPRESSED tile. Names only, byte-level encoding of vnodeID itself still unrecovered — see the eeu.mod page and research/swl_5238_reader.py for the full writeup.

Practical notes

• eeu.il can contain multiple entries pointing at the same eeu.rd record index (observed on the real disc) — don't assume a 1:1 mapping when building a UI row id from a search result; use the row's own position, not the record index.
• This is a separate, much smaller catalog than eeuz.rl/.prl (see Name Search Catalog) — .il looks like a simple lookup index, while .rl/.prl is ~5.3x bigger than eeu.rd itself and carries sort-key-rewritten variants of each name. Which one (if either) the real unit's on-screen address-entry search actually uses is unconfirmed on hardware.

Reader code

rns510_core.py (used by the GUI editing tool's search feature).