Convert a hexadecimal string to a Uint16

hexStringToUint16.dart

import 'dart:typed_data';

/// Converts [input] to a Uint16.
///
/// For example, _decodeToUint16("734c") slices [input] into 2 substrings
/// of 2 hexa characters ('73' and '4c') and create a Uint8 list from their
/// respective decimal representation (i.e. [115, 76]).
///
/// Finally, it returns an unsigned 16-bits integer representation (little endian)
/// by using a [ByteData] view (i.e. '19571').
///
int hexStringToUint16(String input) {
  // Slice the string in 2-char substrings and parse it from hex to decimal
  final bytes = sliceString(input, 2).map((s) => int.parse(s, radix: 16));

  // Create a Uint8 from the 2-bytes list
  final u8list = Uint8List.fromList(bytes.toList());

  // Return a Uint16 little endian representation
  return ByteData.view(u8list.buffer).getUint16(0, Endian.little);
}

/// Slices the [input] string into a list of [count] substrings.
///
/// The [input] string must be divisible in substrings of equal length, otherwise
/// it will throw an [ArgumentError].
///
List<String> sliceString(String input, int count) {
  if (input.isEmpty) return [];

  if (input.length % count != 0) {
    throw ArgumentError("Cannot slice $input in $count slices.");
  }
  final slices = List<String>(count);

  int len = input.length;
  int sliceSize = len ~/ count;

  for (var i = 0; i < count; i++) {
    var start = i * sliceSize;
    slices[i] = input.substring(start, start + sliceSize);
  }

  return List.unmodifiable(slices);
}

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