1.8 KiB
Architecture
File Tools is a static React/Vite application wrapped in the shared Toolbox shell. Browser File handles and small metadata records remain on the main thread. Selection starts an inspection queue with at most three fresh module workers; each worker is terminated on completion, cancellation, timeout, replacement or unmount. Explicit streaming-hash jobs use the same isolated-worker lifecycle.
The worker reads at most 1 MiB from each end for signature, entropy, text and string heuristics. SHA-256 and SHA-512 are updated together in 1 MiB chunks, so hashing does not buffer the complete file. The hex view independently reads one 512-byte window. file/signatures.ts contains project-owned evidence heuristics; file-type provides broader signature hints; @noble/hashes provides incremental hashes.
file/manifest.ts sorts by path and emits JSON or spreadsheet-neutralised CSV. Each row carries its own inspection state/error, while JSON also records aggregate inspected, failed, cancelled and pending coverage so an interrupted batch cannot look complete. Duplicate groups start as same-size candidates and become stronger same-hash candidates after explicit hashing; no deletion or mutation follows. Relative worker and asset URLs keep the build relocatable below a nested portal path.
file/operations.ts owns the bounded export operations. Rename templates are expanded into a deterministic download plan and passed through the shared collision-safe filename planner before any download. Split uses immutable Blob.slice windows and emits a JSON byte-offset manifest; join verifies part count and aggregate size before constructing an ordered Blob. Checksum manifests sort paths and use the conventional escaped GNU sum-file representation. These operations deliberately do not guess which part order, rename semantics, or checksum scope a user intended.