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BadState with null safety version

I'm trying to run with the nullsaftey version but I'm getting bad state error when I call single.

Future<T> get first {
    _Future<T> future = new _Future<T>();
    StreamSubscription<T> subscription =
        this.listen(null, onError: future._completeError, onDone: () {
      try {
throw IterableElementError.noElement();

StateError (Bad state: No element)

This is my code:

import 'dart:io';

import 'package:crclib/catalog.dart';
import 'package:dcli/dcli.dart';
import 'package:test/test.dart';

void main() {
  
  test('hash performance', () async {
    withTempFile((largeFile) async {
      try {
        createLargeFile(largeFile);
        now();
        await File(largeFile).openRead().transform(Crc32()).single;
        now();
      } catch (e) {
        print(e);
      }
    });
  });
}

void now() {
  print(DateTime.now());
}

void createLargeFile(String largeFile) {
  for (int i = 0; i < 100000; i++) {
    largeFile.append('*' * 1000);
  }
}
name: batman
version: 1.0.2
homepage: https://github.com/noojee/batman
description: A System Integrity Monitor for PCI DSS compliance. batman provides file integrity monitoring and log scanners with a built in scheduler suitable for use in a docker container.
repository: https://github.com/noojee/batman
environment: 
  sdk: '>=2.14.4 <3.0.0'
dependencies: 
  dcli: ^1.13.0
  dcli_core: ^0.0.2
  crclib:
    git:
      url: https://github.com/google/crclib.dart.git
      ref: nullsafety  

Does this package have Python crc_hqx function equivalent?

I am trying to convert Python library to dart and I am not sure what the equivalent function for crc_hqx in this dependency.

Example from python

binary_packet = 'fef052000232a1000000000034000100000000000000000013bb2e6100000000000000000000f0fe1c00000000000000000000000000000000000000000000000000000000000000000000000000'
or
binary_packet = [254, 240, 82, 0, 2, 50, 161, 0, 0, 0, 0, 0, 52, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 168, 187, 46, 97, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 240, 254, 28, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

result = crc_hqx(binary_packet, 0x1021);
// result will be 56902

calculated CRC16 ARC

can I calculate the CRC16 ARC with this package
I have a data [0x0E 0x20 0xE0 0x07 0xA5 0x03 0x00 0x00 0x2E 0x46 0x49 0x54] and I want to calculate the CRC16
when I insert the data on the CRC Calculator the result is 0xA447
thanks..

package:crclib/catalog.dart not found

Hi.
This problem occurs on iOS and Android platforms.

The Flutter environment:

[✓] Flutter (Channel dev, 1.27.0-4.0.pre, on macOS 11.1 20C69 darwin-x64, locale en-GB)
    • Flutter version 1.27.0-4.0.pre at /Users/sissa/flutter
    • Framework revision f8cd24de95 (9 weeks ago), 2021-02-16 11:24:17 -0800
    • Engine revision 1d537824d6
    • Dart version 2.13.0 (build 2.13.0-30.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/sissa/Library/Android/sdk
    • Platform android-30, build-tools 29.0.2
    • ANDROID_HOME = /Users/sissa/Library/Android/sdk
    • Java binary at: /Applications/Android Studio 2.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 3.5)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio 2.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] VS Code (version 1.40.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension can be installed from:
      🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (3 available)
    • PRA LX1 (mobile)         • 9DC7N17707001642                         • android-arm64  • Android 7.0 (API 24)
    • SAMCLA’s iPhone (mobile) • f063d3c4cfd212cac4386163446403a522fa40cb • ios            • iOS 14.4.2
    • Chrome (web)             • chrome                                   • web-javascript • Google Chrome 89.0.4389.128

• No issues found!

My pubspec.yaml dependencies:

environment:
  sdk: ">=2.7.0 <3.0.0"
  flutter: ">=1.17.0"

dependencies:
  crclib: ^2.0.0
  flutter:
    sdk: flutter

  flutter_blue:
    git:
      url: git://github.com/pauldemarco/flutter_blue.git

  webdav_client: ^1.0.0

dependency_overrides:
  intl: ^0.17.0-nullsafety.2

dev_dependencies:
  flutter_test:
    sdk: flutter

  mockito: ^5.0.5
  test:

publish_to: none

When I try to build the app, throw this error:

Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **


Xcode's output:
↳
    Error: Could not resolve the package 'crclib' in 'package:crclib/catalog.dart'.
    ../ota_package/lib/ota/utils/download_manager/download_manager_impl.dart:1:8: Error: Not found: 'package:crclib/catalog.dart'
    import 'package:crclib/catalog.dart';
           ^
    ../ota_package/lib/ota/utils/download_manager/download_manager_impl.dart:69:24: Error: The method 'Crc32' isn't defined for the class 'DownloadManagerImpl'.
     - 'DownloadManagerImpl' is from 'package:ota_package/ota/utils/download_manager/download_manager_impl.dart' ('../ota_package/lib/ota/utils/download_manager/download_manager_impl.dart').
    Try correcting the name to the name of an existing method, or defining a method named 'Crc32'.
        String crcResult = Crc32().convert(otaDownloadedFile.getRange(0, otaDownloadedFile.length - 4).toList()).toRadixString(16);
                           ^^^^^
    Unhandled exception:
    FileSystemException(uri=org-dartlang-untranslatable-uri:package%3Acrclib%2Fcatalog.dart; message=StandardFileSystem only supports file:* and data:* URIs)
    #0      StandardFileSystem.entityForUri (package:front_end/src/api_prototype/standard_file_system.dart:33:7)
    #1      asFileUri (package:vm/kernel_front_end.dart:599:37)
    #2      writeDepfile (package:vm/kernel_front_end.dart:738:21)
    <asynchronous suspension>
    #3      FrontendCompiler.compile (package:frontend_server/frontend_server.dart:558:9)
    <asynchronous suspension>
    #4      starter (package:flutter_frontend_server/server.dart:180:12)
    <asynchronous suspension>
    #5      main (file:///opt/s/w/ir/cache/builder/src/flutter/flutter_frontend_server/bin/starter.dart:13:24)
    <asynchronous suspension>


    Command PhaseScriptExecution failed with a nonzero exit code
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Constructing build description

Could not build the precompiled application for the device.

Error launching application on SAMCLA’s iPhone.

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