154 lines
4.3 KiB
Dart
154 lines
4.3 KiB
Dart
import 'dart:convert';
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import 'dart:math';
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import 'package:crypto/crypto.dart';
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import 'package:libac_flutter/nbt/Stream.dart';
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class UUID {
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late final int LSB;
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late final int MSB;
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UUID(int msb, int lsb) {
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MSB = msb.abs();
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LSB = lsb.abs();
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}
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static final UUID ZERO = UUID.generate(0);
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/// Validates whether the given [uuid] is a valid UUID.
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static bool validate(String uuid) {
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try {
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parse(uuid);
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return true;
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} catch (e) {
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return false;
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}
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}
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/// Parses the given [uuid] string and returns a UUID object.
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static UUID parse(String uuid) {
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if (validate(uuid)) {
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final segments = uuid.split('-');
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if (segments.length != 5) {
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throw const FormatException('Invalid UUID format');
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}
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final msbString = segments.sublist(0, 3).join('');
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final lsbString = segments.sublist(3, 5).join('');
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final msb = int.parse(msbString, radix: 16);
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final lsb = int.parse(lsbString, radix: 16);
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return UUID(msb, lsb);
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} else
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return UUID.ZERO;
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}
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@override
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String toString() {
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final msbHex = MSB.toRadixString(16).padLeft(16, '0');
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final lsbHex = LSB.toRadixString(16).padLeft(16, '0');
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return '${msbHex.substring(0, 8)}-${msbHex.substring(8, 12)}-${msbHex.substring(12, 16)}-${lsbHex.substring(0, 4)}-${lsbHex.substring(4, 16)}';
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}
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/// Returns the Most Significant Bits (MSB) long value of the UUID.
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int getMostSignificantBits() => MSB;
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/// Returns the Least Significant Bits (LSB) long value of the UUID.
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int getLeastSignificantBits() => LSB;
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/// Factory method to generate UUID of the specific version.
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factory UUID.generate(int version, {List<Object>? parameters}) {
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List<Object> params = [];
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if (parameters == null) {
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if (version != 4) {
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return UUID.generate(4);
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}
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} else
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params = parameters!;
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switch (version) {
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case 0:
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return UUID(0, 0);
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case 3:
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{
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if (params.length != 2)
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throw Exception(
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"UUID v3 requires two parameters, [namespace,name]");
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String namespace = params[0] as String;
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String name = params[1] as String;
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ByteLayer layer = ByteLayer();
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if (!namespace.isEmpty) {
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final namespaceBytes = utf8.encode(namespace);
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layer.writeBytes(namespaceBytes);
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}
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if (!name.isEmpty) {
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final nameBytes = utf8.encode(name);
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layer.writeBytes(nameBytes);
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}
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var bytes = md5.convert(List.from(layer.bytes)).bytes;
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layer.clear();
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layer.writeBytes(bytes);
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layer.unsetSetBit(6, 0x0F, 0x30);
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layer.unsetSetBit(8, 0x3F, 0x80);
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layer.resetPosition();
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return UUID(layer.readLong(), layer.readLong());
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}
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case 4:
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{
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ByteLayer layer = ByteLayer();
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final random = Random.secure();
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layer.writeLong(
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(random.nextInt(0xFFFFFFFF) << 32) | random.nextInt(0xFFFFFFFF));
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layer.writeLong(
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(random.nextInt(0xFFFFFFFF) << 32) | random.nextInt(0xFFFFFFFF));
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layer.unsetSetBit(6, 0x0F, 0x40);
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layer.unsetSetBit(8, 0x3F, 0x80);
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layer.resetPosition();
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return UUID(layer.readLong(), layer.readLong());
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}
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case 5:
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{
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ByteLayer layer = ByteLayer();
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if (params.length != 2)
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throw Exception(
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"UUID v5 requires two parameters, [namespace,name]");
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String namespace = params[0] as String;
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String name = params[1] as String;
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if (!namespace.isEmpty) {
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final namespaceBytes = utf8.encode(namespace);
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layer.writeBytes(namespaceBytes);
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}
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if (!name.isEmpty) {
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final nameBytes = utf8.encode(name);
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layer.writeBytes(nameBytes);
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}
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final hashBytes = sha1.convert(List.from(layer.bytes)).bytes;
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layer.clear();
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layer.writeBytes(hashBytes);
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layer.unsetSetBit(6, 0x0F, 0x50);
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layer.unsetSetBit(8, 0x3F, 0x80);
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layer.resetPosition();
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return UUID(layer.readLong(), layer.readLong());
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}
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default:
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throw ArgumentError('Unsupported UUID version: $version');
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}
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}
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}
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