binary 0.1.3

binary #

Utilities for working with binary data and bit manipulation in Dart.

Pub Build Status Coverage Status documentation

NOTE: Unless otherwise noted, all functionality is based around treating bits as little endian, that is in a 32-bit integer the leftmost bit is 31 and the rightmost bit is 0

Overview #

This library supports an Integral data type for fluent bit manipulation:

print(uint8.toBinaryPadded(196)); // '11000100'

Because of Dart's ability to do advanced inlining in both the Dart VM and dart2js, this library should perform well and be extremely easy to use for most use cases. For example, it's used in an arm7_tdmi emulator.

Usage #

This library has a combination of top-level methods, and instance methods of pre-defined Integral data types (see below). For example there are two ways to clear (set to 0) a bit:

// Sets the 0th bit in an (int) bits to 0
bits = clearBit(bits, 0)

However, this will not do range validation. Use Integral#clearBit:

// Sets the 0th bit in a uint32 to 0.
// In dev-mode, if either bits or `n` is out of range it throws.
bits = uint32.clearBit(bits, 0);

Integral data types #

  • bit
  • int4
  • int8
  • int16
  • int32
  • int64
  • int128
  • uint4
  • uint8
  • uint16
  • uint32
  • uint64
  • uint128

Learning more #

See the dartdocs for more about the API.

0.1.3 #

  • Added arithmeticShiftRight

0.1.2 #

  • Moved into a standalone repository (outside of gba.dart).
  • Added signExtend as a method to Integral.
  • Added areSet.
  • Added msb.

0.1.1 #

  • Added signExtend

0.1.0 #

  • Fixed a bug where int128 and uint128 only had a length of 64.

0.0.4 #

  • Updated the documentation and README.

0.0.3 #

  • Added isZero.

0.0.2 #

  • Added isNegative, hasCarryBit, doesAddOverflow, doesSubOverflow, mask.
  • Added parseBits.

0.0.1 #

  • Add top-level isSet and isClear, Integral#isSet, Integral#isClear.
  • Add checked-mode range checks to bitChunk and bitRange.
  • Fix a bug in the implementation of bitChunk and bitRange.
  • Added a top-level fromBits and Integral#fromBits

0.0.0 #

  • Initial commit, feedback welcome!

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  binary: ^0.1.3

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:binary/binary.dart';
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The package version is not analyzed, because it does not support Dart 2. Until this is resolved, the package will receive a health and maintenance score of 0.

Analysis issues and suggestions

Support Dart 2 in pubspec.yaml.

The SDK constraint in pubspec.yaml doesn't allow the Dart 2.0.0 release. For information about upgrading it to be Dart 2 compatible, please see

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Make sure dartdoc successfully runs on your package's source files. (-10 points)

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Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.23.0-dev.1.0 <2.0.0