71 lines
1.9 KiB
TypeScript
71 lines
1.9 KiB
TypeScript
/* istanbul ignore file */
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'use strict';
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import { ethers } from "ethers";
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function randomBytes(seed: string, lower: number, upper?: number): Uint8Array {
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if (!upper) { upper = lower; }
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if (upper === 0 && upper === lower) { return new Uint8Array(0); }
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let result = ethers.utils.arrayify(ethers.utils.keccak256(ethers.utils.toUtf8Bytes(seed)));
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while (result.length < upper) {
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result = ethers.utils.concat([result, ethers.utils.keccak256(ethers.utils.concat([seed, result]))]);
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}
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let top = ethers.utils.arrayify(ethers.utils.keccak256(result));
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let percent = ((top[0] << 16) | (top[1] << 8) | top[2]) / 0x01000000;
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return result.slice(0, lower + Math.floor((upper - lower) * percent));
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}
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function randomHexString(seed: string, lower: number, upper?: number): string {
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return ethers.utils.hexlify(randomBytes(seed, lower, upper));
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}
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function randomNumber(seed: string, lower: number, upper: number): number {
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let top = randomBytes(seed, 3);
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let percent = ((top[0] << 16) | (top[1] << 8) | top[2]) / 0x01000000;
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return lower + Math.floor((upper - lower) * percent);
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}
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function equals(a: any, b: any): boolean {
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// Array (treat recursively)
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if (Array.isArray(a)) {
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if (!Array.isArray(b) || a.length !== b.length) { return false; }
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for (let i = 0; i < a.length; i++) {
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if (!equals(a[i], b[i])) { return false; }
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}
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return true;
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}
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// BigNumber
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if (a.eq) {
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if (!b.eq || !a.eq(b)) { return false; }
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return true;
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}
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// Uint8Array
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if (a.buffer) {
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if (!b.buffer || a.length !== b.length) { return false; }
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for (let i = 0; i < a.length; i++) {
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if (a[i] !== b[i]) { return false; }
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}
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return true;
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}
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// Something else
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return a === b;
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}
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export {
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randomBytes,
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randomHexString,
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randomNumber,
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equals
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}
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