DOG-013: dog/ reuse — dup decoders/walks, hand-rolled maps, boilerplate

Now: OPEN
Sev: MED

The review found repeated hand-rolled machinery across dog/ that abc already provides or that should be factored once. This is behaviour-preserving cleanup; it also de-risks the security tickets, since DOG-008's index-validation fix has to land in the three duplicate WEAVE decoders unless they are consolidated first. Distinct from PTR-002 (which is the pointer-arithmetic/buffer-poke style pass) — this is structural duplication and missed abc reuse (CLAUDE.md #13). Method: Issues.

Input

Context

WEAVE: three near-identical "materialize columns via WEAVEStep walk" decoders — wmerge_decode (WEAVE.c:526-581), weave_emit_decode (:936-966), inline pass-1 in wnext_diff (:350-364); wmerge_decode is a superset. Consolidate into one validated decoder.
WEAVE: hand-rolled open-addressing u64map (WEAVE.c:610-631) duplicates HASHx; u64map_cap (:627-631) has a latent u32 overflow (c<<=1 past 2^31 → mask 0 / infinite loop).
ULOG: ULOGCompactLatest pass 1 (ULOG.c:868-887) re-implements ulog_each_latest (:806-837) line-for-line (already drifted once); extend the latter with an index-aware callback.
ULOG: seen_contains (:795-800) is an O(K²) linear scan where HASHx fits (the comment concedes it); ULOG.md:119 misdescribes it as "linear-probe Bu64".
ULOG: ULOGOpenRO (:596-630) duplicates ULOGOpenBooked (:538-589) bar the booking call; the two unwind blocks already differ subtly. ULOGu8csZbyTs/ ZbyUri (:995-1022) + ulog_path_eq (:1047-1054) triplicate dup/peek/key.
HUNK: hunk_ron60_to_time (:44-51) == htbl_ron60_to_secs (:1661-1668); empty-text/non-diff blocks copied :1319-1333 from :596-610; the "prefix+line+\n into dels/adds" motif appears 6× (:1376-1467) though hk_emit_line (:1153-1159) exists.
BRAM: libc qsort (:203) where abc/SORT.h exists. HUNK hand-rolls an uppercase hex table (:77) because abc/HEX ships lowercase only — contribute an uppercase variant to abc/HEX.h instead.

Goals

One validated WEAVE column decoder; u64map → HASHx (fixes the overflow); ULOG walks/opens/key-helpers de-duplicated; HUNK ron60 + render blocks folded; BRAM qsort → abc/SORT.h; uppercase hex upstreamed to abc/HEX.h.

Constraints

dog/ + dog/git libdog, ABC style; strictly behaviour-preserving (all existing tests stay green); no wire-format change.

WIP

TODOs

T1 consolidate the three WEAVE decoders (coordinate with DOG-008 T4).
T2 u64map/seen_contains → HASHx.
T3 ULOG walk/open/key de-dup + doc fix.
T4 HUNK ron60 + render-block folding.
T5 BRAM qsort → SORT; uppercase hex → abc/HEX.h.

Blockers and bummers

Pairs with PTR-002 (same files, style axis) and DOG-008 (decoder merge).
Audit 2026-07-07: re-verified in libdog HEAD 79612854 — wmerge_decode WEAVE.c:526, weave_emit_decode :936, inline pass in wnext_diff :335+, u64map/u64map_cap :613-631, seen_contains ULOG.c:797, hunk_ron60_to_time HUNK.c:44, qsort BRAM.c:203 all still present. NOTHING landed; WIP UNLANDED in worktree ~/src/DOG-013 (WEAVE.c a.o. modified).

Outcome

OPEN — filed 2026-07-06, the libdog code-quality review session.