44 lines
1.7 KiB
JavaScript
44 lines
1.7 KiB
JavaScript
'use strict';
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import fs from 'fs';
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import path from 'path';
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import zlib from 'browserify-zlib';
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import { arrayify, concat, hexlify } from "@ethersproject/bytes";
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import { keccak256 } from "@ethersproject/keccak256";
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import { toUtf8Bytes } from "@ethersproject/strings";
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export function saveTests(tag, data) {
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//let filename = path.resolve(__dirname, 'testcases', tag + '.json.gz');
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let filename = path.resolve('../testcases', tag + '.json.gz');
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fs.writeFileSync(filename, zlib.gzipSync(JSON.stringify(data, undefined, ' ') + '\n'));
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console.log('Save testcase: ' + filename);
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}
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export function loadTests(tag) {
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let filename = path.resolve(__dirname, '../testcases', tag + '.json.gz');
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return JSON.parse(zlib.gunzipSync(fs.readFileSync(filename)).toString());
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}
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export function loadData(filename) {
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return fs.readFileSync(path.resolve(__dirname, filename));
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}
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export function randomBytes(seed, lower, upper) {
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if (!upper) {
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upper = lower;
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}
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if (upper === 0 && upper === lower) {
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return new Uint8Array(0);
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}
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let result = arrayify(keccak256(toUtf8Bytes(seed)));
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while (result.length < upper) {
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result = concat([result, keccak256(result)]);
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}
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let top = arrayify(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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export function randomHexString(seed, lower, upper) {
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return hexlify(randomBytes(seed, lower, upper));
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}
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export function randomNumber(seed, lower, upper) {
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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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