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opened 2026-10-31 01:12:39 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/4362
Author: @8rulerstar
Created: 10/16/2026
Status: 🔄 Open
Base:
main← Head:feat/unreal-pak📝 Commits (10+)
256c3c1feat(unreal): decode pak footers and indexes for versions 1 to 126e03715feat(unreal): read pak indexes from stable file ranges through a provider and service411fed9feat(unreal): expose inspect_unreal_pak through CLI, MCP and analysis viewscb42c6btest(unreal): cover pak versions, index forms, failures and CLI/MCP delivery486d430docs(unreal): add the pak index guide, CLI reference, skill notes and a real-file verifier587cbf5refactor(unreal): drop an unused index type exporte1e3864fix(unreal): reject inconsistent counts, leftover listing bytes and unknown compression slots52ab2fbdocs(unreal): document the pruned directory index and the new consistency failures77ceb30refactor(artifacts): share admission and change checks between whole-file and ranged stable reads539e754fix(unreal): check index SHA-1s, entry placement and built path size📊 Changes
43 files changed (+4727 additions, -49 deletions)
View changed files
📝
.agents/skills/reverse-engineer-anything/SKILL.md(+5 -0)📝
.agents/skills/reverse-engineer-anything/references/native-and-artifacts.md(+10 -0)📝
README.md(+1 -0)📝
docs/.vitepress/config.ts(+1 -0)📝
docs/cli.md(+14 -0)➕
docs/unreal-pak.md(+211 -0)📝
package.json(+1 -0)📝
scripts/lib/module-boundaries.mjs(+1 -0)➕
scripts/verify-unreal-pak.mjs(+145 -0)📝
src/application/CapabilityInventory.ts(+1 -0)➕
src/application/unreal/UnrealPakPort.ts(+20 -0)➕
src/application/unreal/UnrealPakService.ts(+134 -0)📝
src/artifacts/readStableArtifact.ts(+169 -37)📝
src/cli.ts(+2 -0)➕
src/cli/unrealCommands.ts(+55 -0)📝
src/cliCommandNames.ts(+1 -0)📝
src/composition/capabilityDeclarations.ts(+8 -0)📝
src/composition/capabilityServices.ts(+6 -0)➕
src/composition/unreal.ts(+6 -0)📝
src/contracts/analysisViewToolContracts.ts(+1 -1)...and 23 more files
📄 Description
Thank you for merging main into this branch to refresh CI. I merged the latest main again and fixed five reader boundaries found in a self-review; details are under Executed validation.
Summary
Adds
inspect_unreal_pak(CLI:inspect-unreal-pak): static inspection of one local Unreal.pak(versions 1 to 12). It reads the footer and the index regions the footer names and returns each entry's path, offset, sizes, compression method, block facts, encryption and deletion flags and stored SHA-1. File data is never decoded. Refs #3625, narrower: no extraction, decompression, decryption or keys, no IoStore or.uasset.Behavior and boundaries
src/unreal/UnrealPakFile.tsowns format interpretation;src/unreal/UnrealPakPathHash.tsowns the path hash rule. The service projects the decoded regions into Evidence locations, and the analysis view only projects retained Evidence (kindunreal-pak, collectionsentriesby indices/paths andissuesby indices/kinds, withfields; every row keeps its sourceindex).--detail summary --evidence_output FILE, matchinginspect_il2cpp_metadata.issuesand decoding continues: region SHA-1, repeated path or path hash, entry counts between listings, an empty compression slot, a directory name without its closing/, and (version 11+, both indexes present) a directory index path whoseFPakFile::HashPathvalue the path hash index does not map to the same record. An entry-count mismatch nullsindex.entry_count; an empty slot nulls that entry'scompression_name; the last two null the affectedpath, so no path is joined from a malformed directory name. A SHA-1 mismatch or repeated path is an issue only. Compression slot issues come only from records a listing references. Untrustworthy structure (out-of-file offsets or sizes, truncated records, dangling references) is refused with one of 12 named reasons.PakFile.cppandMisc/Fnv.cpp: ASCII lowercase, UTF-16LE code units, FNV-64 with the seed added to the offset basis. Version 10 is not checked: UE uses legacy constants there, repak 0.2.3 writes the version 11 hash, and no UE-written version 10 pak was available.index.state: "encrypted", and emptyentries/issuesthere mean "not read", not "none".paths-too-largereports resourcetransportwithmaximum_output_bytesandmaximum_path_utf16_units. Size uses the sharedjsonValueByteLength. Long decodes yield every 4,096 records, directories included. Peak memory is not measured.src/artifacts/readStableArtifact.tsgains positioned reads with existing tests unchanged.Executed validation
At
7f194e500(Greptile fixes on merge1c4870b94of main8413ec08f; reader fixes inb7486a740):/producedGame/ConfigDefaultGame.iniwith no issue; a wrong path hash went unnoticed; 50,000 unreferenced records produced 50,000 issues; three regions each under the limit were accepted together;paths-too-largereportedfile-sizewithout the path limit). After the fix, 68/68.1c4870b94, regressions first: a version 1 timestamp of realFDateTimeticks (about 6.4e17) failedregion-out-of-bounds(58 passed / 1 failed inunrealPakFile.test.ts) and now reads (69/69 Unreal boundary tests). A 9,600,347-byte pak of 600,000 unreferenced records naming an empty slot ran out of a 128 MiB heap and now finishes (0 entries, 0 issues); structure-only walks keep no issues.npm run check(typecheck, lint with 0 errors, format, knip, metadata, architecture guards),docs:check.tests/boundary/unreal69,unrealPakCliacceptance 4,stableArtifactConsumers39.7f194e500: 24,535 passed, 13 failed, 402 skipped; all 13 are outside Unreal (inspector, process, pcap, gdb, two acceptance files).verify:unreal:pakon the UE 5.8.3Blank58-Mac.pak: CLI/MCP parity, layout 12, 1,722 entries, 0 issues; all 1,722 directory index paths match their path hashes and the 1,722 pathsrepak list0.2.3 prints. Replacing the seed by seed + 1 in a local experiment produced apath-hash-mismatchfor the paths, so the comparison runs.b7486a740: 13 UE 5.8 paks from the CUE4Parse test fixtures (11 with both indexes, 2 with encrypted indexes) and 24 repak 0.2.3 paks (versions 1 to 11, stored and Zlib).Contributor-reported at
162a90e8f(not rerun at the head above): 47 self-built paks matched repak 0.2.3 and CUE4Parse entry for entry, except CUE4Parse's single-block size convention; ten UE 5.8.3 UnrealPak variants also read correctly, including path-hash-only paks that both readers list as empty.Tests: a byte-level fixture builder drives one boundary test per failure reason and issue kind and layouts v1, v3, v4 and v7 to v12, plus CLI/MCP parity. No threshold or exclusion changes.
Coverage limits
Not covered: Windows or console paks, real version 9 frozen indexes (refused), version 10 path hashes (unchecked), and layouts v2, v5 and v6 in the test matrix. Compression names identify methods only. Entry and hash agreement is structural evidence, not proof of a correct cook. Cost (time, memory) on large paks is unmeasured. No game was executed and no file was modified.
Contract and boundary impact
src/unreal/UnrealPakFile.ts.inspect_analysis_viewgains kindunreal-pak, an Unreal pak summary and theinspect_unreal_pakparent operation, additively.observedEvidence with artifact SHA-256 and file-offset ranges of the footer and index regions read.docs/public/product-catalog.json), package, or installation impact: catalog entries regenerate; authored skill references updated; oneverify:unreal:pakscript; no package or installation change.Expected effects (check known effects; use documentation-only on its own).
Unchecked items do not establish absence; leave uncertainties visible.
Author readiness
Human owner: @8rulerstar
Before merge
type(scope): outcome.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.