RustCoreBackend.invokeApplication handled readFileMetadata,
editFileMetadata and cancelNativeDataJob, but MainActivity intercepts
all three first: the metadata methods are in nativeBackendMethods and
dispatchBackendApplication answers cancelNativeDataJob before it calls
invokeApplication. No Kotlin code calls invokeApplication with those
names.
Dart never sends these channel methods, so their handlers go on every
platform:
- shareMultipleContentUris (Android) and getAvailableLyricsProviders
(Android and iOS) have no Dart caller.
- scanLibraryFolderIncrementalFromSnapshot and
scanSafTreeIncrementalFromSnapshot are called only from the Dart host
branch of the library scan, which runs only when
supportsCoreBackend is false, that is never on Android or iOS. The
unreachable Dart wrappers are removed separately.
The allowlist and the when cases in MainActivity stay in sync (70
names). The UniFFI exports get_available_lyrics_providers_json and
scan_library_folder_incremental_from_snapshot were used only by the
removed handlers; the backend methods behind them stay.
Rust is the only backend, so several single-backend switches had become
constants and their other branches could never run:
- CoreBackend.supportsOutputDescriptors was always false. The
descriptor branch in SafDownloadHandler and its pfd/detachFd cleanup
never ran, and the Rust planner rejects output_fd anyway.
- routesApplication was always true on Android and iOS. Drop the member,
the "go" value of getBackendImplementations (the reply keys and the
"rust" value Dart receives are unchanged), the iOS routing guard and
the interface defaults that threw for unrouted methods.
- cleanupExtensions(), waitForDownloadProgressDelta and
scanCueForLibrary had no production caller. Dart reaches cleanup
through the cleanupExtensions channel method, and RustCoreBackend
overrides openDownloadProgress, so the polling default goes too.
The UniFFI exports DownloadState.wait_progress_delta and
ExtensionManager.scan_cue_file_for_library were used only by those
Kotlin overrides. Bindings are generated at build time by
scripts/build_rust_backend.sh; no generated binding is tracked.
Honor the requested MIME across publication paths, retain the audio suffix in temporary names, and exclude unfinished documents from full and incremental scans. Verify MIME and byte integrity across four formats and publication modes.
Provider and decryption extensions describe the downloaded container, not
its audio codec. A decrypted M4A/MP4 can still carry FLAC, so a requested
FLAC output now reaches the codec probe instead of being preserved early.
Lossy streams keep their native container and still receive metadata.
Move full and incremental ingestion, source snapshots, path keys, and download exclusion to native transactions. Preserve schema 17, FTS, WAL coordination, cancellation, and Android SAF timestamp backfill.
Port the pinned Material quantizer and Dart RNG compatibility to Rust while keeping Material Score and final color schemes in Dart. Include exact palette fixtures, licenses, and Kotlin worker ABI coverage.
Introduce Android, iOS, and Dart worker dispatch with queued cancellation, binary inputs, and background JSON codecs. Move APK verification to streamed native SHA256 while retaining the isolated fallback.
Open temporary media directory grants for reading, embedding and exporting lyrics on iOS and Android. Resolve native file aliases consistently while retaining extension storage restrictions.
Validate with 4 iOS integration tests, 42 Flutter tests, 6 Rust file capability tests, and Android Kotlin compilation. Refs #631.
Handle feature and featured separators across display, Android finalization and Rust tag writing. Split conjunction credits only when separate artist IDs confirm them, and offer a picker for multi-artist navigation.
zarzet