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[PR #2804] [MERGED] fix(flutter): find snapshot headers that a read chunk boundary splits #5407
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opened 2026-10-31 01:06:24 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/2804
Author: @Dragolone
Created: 10/13/2026
Status: ✅ Merged
Merged: 10/13/2026
Merged by: @morluto
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main← Head:fix/flutter-snapshot-scan-chunk-boundary📝 Commits (2)
c24f744fix(flutter): find snapshot headers that a read chunk boundary splits743dbfbrefactor(flutter): drop the snapshot scanner cursor the fix superseded📊 Changes
2 files changed (+37 additions, -14 deletions)
View changed files
📝
src/flutter/FlutterPayloadScan.test.ts(+31 -0)📝
src/flutter/FlutterPayloadScan.ts(+6 -14)📄 Description
Summary
identify_flutter_buildcan omit a Dart snapshot hash, and reportcoverage: "complete"with a single agreed hash, depending only on where the APK reader's chunk boundaries fall.Within one chunk,
SnapshotHashScannerresumes four bytes after each magic. Across chunks it resumed after the whole 52-byte magic-to-hash record and dropped the carried bytes. A magic starting 49–51 bytes after a rejected (non-hex) record was therefore lost when its four bytes straddled a read boundary. This PR resumes after the magic in both cases.No issue is linked: I searched issues and PRs for
SnapshotHashScanner,FlutterPayloadScan, "snapshot hash chunk boundary", "snapshot magic" andidentify_flutter_buildand found no report. The #1582 review fixed chunk-boundary cases in the labeled-string scanner, not this one. Open PR #2334 touchesDartElf.ts, not this scanner.Problem and expected behavior
Smallest trigger: a stray magic
f5 f5 dc dcwhose hash field is not lowercase hex, followed 50 bytes later by a real snapshot section. Fed as one chunk, the scanner finds 1 source. Split at byte 52, it finds 0.End to end: an APK whose
lib/arm64-v8a/libapp.soholds the VM and isolate sections (hash65817c30…), a stray magic at 65484, and a third section with hash2222…at 65534. The third section's magic straddles zip.js's 64 KiB read boundary.Violated contract:
docs/flutter-analysis.mdsays that when snapshot hashes disagree, all candidates are kept,snapshot_hashis null, and coverage is partial rather than silently picking one. With the bug, the conflicting hash is dropped and the result says complete.Expected: the result does not depend on chunking, so the APK above reports both candidates, a null hash, and partial coverage.
Change and scope
The cross-chunk resume point now matches the in-chunk one: right after the processed magic. After a complete record, the carried tail is shorter than a magic. A pending magic has not been processed yet. So each push can rescan its carried bytes from the start without counting a record twice. That made the absolute cursor (
#absoluteScanFrom) and its#baseoffset unnecessary, and both are removed (thanks to the Codex review). No other scanner behavior changes. Not included: the labeled-string scanner andDartElf.ts.Contribution scope: an ordinary static format-inspection correctness fix within existing boundaries; a maintainer scope decision is not applicable.
Contract and boundary impact
SnapshotHashScanner.pushinsrc/flutter/FlutterPayloadScan.ts.snapshot_hash_sources,snapshot_hash_candidates,snapshot_hashandcoveragenow match the single-chunk result for affected inputs.docs/public/product-catalog.json), package, or installation impact: none.Expected effects (check known effects; use documentation-only on its own).
Unchecked items do not establish absence; leave uncertainties visible.
Evidence and regression coverage
src/flutter/FlutterPayloadScan.test.ts— "finds a section %i bytes after a rejected record at any chunking", run for offsets 49, 50 and 51. It splits the payload at every byte and also feeds it one byte at a time. Every result must equal the single-chunk result.91830f1e0all three cases fail withAssertionError: split at 52: expected { sources: +0, candidates: [], …(1) } to deeply equal { sources: 1, …(2) }.FlutterBuildProvideridentify_flutter_buildon the APK described above (a local test that was not committed):{ coverage: 'complete', sources: 2, candidates: [ '65817c30a78bb44c3dc3771876b6010a' ], hash: '65817c30a78bb44c3dc3771876b6010a' }{ coverage: 'partial', sources: 3, candidates: [ '65817c30a78bb44c3dc3771876b6010a', '22222222222222222222222222222222' ], hash: null }For evidence-bearing changes:
Validation performed
macOS (Apple silicon), Node 24.19.0.
npx vitest run src/flutter/FlutterPayloadScan.test.tsagainst the base scanner — the three new cases fail as quoted above (14 others pass).npx vitest run src/flutter/with the fix — 2 files, 31 tests passed.identify_flutter_buildcomparison above, run against the base and the fix.npm run typecheck— passed.npx oxfmt --checkon both changed files — passed.npm run verify:module-boundaries— passed.npm run lint— the only error istests/boundary/providers/ghidra/ghidraLauncher.test.ts:431(max-lines-per-function), which this PR does not touch. The changed files have only the existingno-control-regexwarnings.Compatibility, safety, and release
Before merge
type(scope): outcome.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.