varuint-bitcoin

encode/decode number as bitcoin variable length integer

valuestorage length (bytes)
[0, 0xfd)1
0xfd, 0xffff3
0x010000, 0xffffffff5
0x0100000000, 0x1fffffffffffff9

Installation

dart pub add dart_varuint_bitcoin

Example

import 'dart:typed_data';

import 'package:convert/convert.dart';
import 'package:dart_varuint_bitcoin/dart_varuint_bitcoin.dart' as varuint;

void main() {
  Uint8List buffer = Uint8List(2);
  final encoded = varuint.encode(0xfc, buffer, 1);
  print(hex.encode(encoded.buffer.buffer.asUint8List()));
  // => 00fx

  Uint8List buffer2 = Uint8List.fromList([0x00, 0xfc]);
  final decoded = varuint.decode(buffer2, 1);
  print(decoded.output.toRadixString(16));
  // => fc
}

License

MIT

Libraries

dart_varuint_bitcoin
This package uses it to encode/decode the number as bitcoin variable length integer.