blit 0.1.0

Zero-copy Bytes/BytesMut and high-performance random-access file I/O for Dart and Flutter, with native FFI mmap and Web OPFS.

Changelog

0.1.0

First development release.

Added

• Zero-copy Bytes views (slice/sublist O(1)) and BytesMut with freeze/splitTo/splitOff copy-on-write semantics.
• Exact Uint64 (hi/lo limbs) for VM, dart2js and dart2wasm, including arithmetic, bitwise, shifts, parse and toRadixString.
• BytesReader/BytesWriter fixed-width cursors with BE/LE support.
• BytesFile/SyncBytesFile and the native dart:io backend.
• Native mmap engine: Windows CreateFileMappingW, POSIX mmap/pread; sparse files, zero-copy windows, zeroize, read-only mappings.
• Windows IocpFile: overlapped I/O + IOCP, QD 1–128 batch reads/writes.
• MappedRegion.prefetch() / discard(): Windows PrefetchVirtualMemory (discard is a no-op for file-backed maps), POSIX madvise(MADV_WILLNEED / MADV_DONTNEED).
• Bytes.getUint8/16/32Unchecked and BytesReader.readUint8/16/32/64Unchecked hot-path methods (caller checks bounds once).
• Direct I/O: openMmapFileSync(..., direct: true) / ParallelBytesFile.open(..., direct: true) via Windows FILE_FLAG_NO_BUFFERING + VirtualAlloc, Linux/Android O_DIRECT, and macOS/iOS F_NOCACHE; aligned scratch buffers and 4 KiB-aligned streaming reads/writes.
• ParallelBytesFile: isolate worker pool (default up to 32), automatic FIFO dispatch, batch 32, readMany/writeMany, watermark barriers, adjacent-range coalescing, and a read-only full-file mmap cache for hot files (default limit 1 GiB).
• Web OPFS backend: chunk files, double-slot manifest, CRC-32, dedicated worker, capability/quota probing.
• Benchmark suite (benchmark_test, JIT/AOT + JSONL), a generated assets/benchmarks.svg, and Dart/Flutter CI workflows.
• Tests: differential fuzz, lifetime/error paths, 100k-op stress, 32 GiB sparse.

Fixed during development

• putUint64 little-endian limb encoding and atomic failure on short buffers.
• ParallelBytesFile barrier deadlock when queued work already existed.
• Windows read-only mapping zeroize guard and empty-file map consistency.