mirror of https://github.com/vector-im/riot-web
35 lines
1.0 KiB
TypeScript
35 lines
1.0 KiB
TypeScript
/*
|
|
Copyright 2023 The Matrix.org Foundation C.I.C.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
// Fake random strings to give a predictable snapshot for IDs
|
|
// Simple Xorshift random number generator with predictable ID
|
|
export class PredictableRandom {
|
|
private state: number;
|
|
|
|
constructor() {
|
|
this.state = 314159265;
|
|
}
|
|
|
|
get(): number {
|
|
this.state ^= this.state << 13;
|
|
this.state ^= this.state >> 17;
|
|
this.state ^= this.state << 5;
|
|
return this.state / 1073741823;
|
|
}
|
|
|
|
reset(): void {
|
|
this.state = 314159265;
|
|
}
|
|
}
|