48 lines
1.1 KiB
Dart
48 lines
1.1 KiB
Dart
import 'dart:typed_data';
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class Utils {
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static List<int> splitDigits(int number) {
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final digits = <int>[];
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while (number != 0) {
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digits.add(number % 10);
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number = number ~/ 10;
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}
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return digits;
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}
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static Uint8List serializeBigInt(BigInt bi) {
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Uint8List array = Uint8List((bi.bitLength / 8).ceil());
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for (int i = 0; i < array.length; i++) {
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array[i] = (bi >> (i * 8)).toUnsigned(8).toInt();
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}
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return array;
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}
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static BigInt deserializeBigInt(Uint8List array) {
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var bi = BigInt.zero;
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for (var byte in array.reversed) {
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bi <<= 8;
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bi |= BigInt.from(byte);
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}
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return bi;
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}
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/// FOR ISAR, FROM ISAR DOCUMENTATION
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/// FNV-1a 64bit hash algorithm optimized for Dart Strings
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static int fastHash(String string) {
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var hash = 0xcbf29ce484222325;
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var i = 0;
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while (i < string.length) {
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final codeUnit = string.codeUnitAt(i++);
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hash ^= codeUnit >> 8;
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hash *= 0x100000001b3;
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hash ^= codeUnit & 0xFF;
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hash *= 0x100000001b3;
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}
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return hash;
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}
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}
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