flutter pub add crclib根據套件公開資料產生的選型評估，僅供參考。
crclib 是一個 Dart 套件，提供一組循環冗餘檢查（CRC）例程作為轉換器，設計用於高效資料完整性驗證。它支援多種 CRC 算法，並能順暢整合至跨 Android、iOS、Web、macOS、Windows 及 Linux 的 Flutter 應用程式。此套件非常適合用於檔案傳輸、網路通訊及嵌入式系統中的資料一致性驗證。以極小的開銷與直覺的使用方式，crclib 讓開發者能輕鬆實作強大的校驗和驗證。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
This is not an official Google product.
Generic CRC calculations as Dart converters and some common algorithms.
The easiest way to use this library is to call convert on the instance of
the desired CRC routine.
Crc32Xz().convert(utf8.encode('123456789')) == 0xCBF43926
Another supported use case is as stream transformers.
File(...).openRead().transform(Crc32Xz()).single.then(...)
Instead of using predefined classes, it is also possible to construct a
customized CRC function with ParametricCrc class. For a list of known
CRC routines, check out https://reveng.sourceforge.io/crc-catalogue/all.htm.
TODO:
inputReflected and outputReflected can be different, see CRC-12/UMTS.With CrcFlipper, one can call flipWithData or flipWithValue depending on
whether they have access to the message, or only its calculated CRC value. The
snippet below is taken from test/flipper_test.dart.
var inputMessage =
'flipping lowercases to uppercases like mama pig making hot pancakes '
'for daddy pig in peppa pig cartoon';
// Mark the lower/upper-case bit in each character.
// 0x61 = 'a' = 0110 0001
// | <-- 5th bit, zero-indexed
// 0x41 = 'A' = 0100 0001
var positions = inputMessage.codeUnits
.asMap()
.entries
.where((e) => e.value >= 0x61 && e.value < 0x61 + 26)
.map((e) => e.key * 8 + 5)
.toSet();
var flipper = CrcFlipper(Crc64());
var solution = flipper.flipWithData(inputMessage.codeUnits, positions,
CrcValue(BigInt.parse('DEADBEEFCAFEBABE', radix: 16)))!;
var tmp = List.of(inputMessage.codeUnits, growable: false);
solution.forEach((bitPosition) {
var mask = 1 << (bitPosition % 8);
tmp[bitPosition ~/ 8] ^= mask;
});
var outputMessage = String.fromCharCodes(tmp);
expect(
outputMessage,
'flIPpiNG LOWErcAsEs To uPpERcaseS LIkE mAmA Pig mAKInG hOT paNcAKEs '
'For DAdDY pig in peppa pig cartoon');
The detailed algorithm is documented in flipping_algorithm.md.