53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
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var fs = require('fs');
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var path = require('path');
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var utils = require('ethers-utils');
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function randomBytes(seed, lower, upper) {
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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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seed = utils.toUtf8Bytes(seed);
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var result = utils.arrayify(utils.keccak256(seed));
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while (result.length < upper) {
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result = utils.concat([result, utils.keccak256(utils.concat([seed, result]))]);
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}
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var top = utils.arrayify(utils.keccak256(result));
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var percent = ((top[0] << 16) | (top[1] << 8) | top[2]) / 0x00ffffff;
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return result.slice(0, lower + parseInt((upper - lower) * percent));
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}
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function randomHexString(seed, lower, upper) {
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return utils.hexlify(randomBytes(seed, lower, upper));
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}
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function randomNumber(seed, lower, upper) {
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var top = randomBytes(seed, 3);
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var percent = ((top[0] << 16) | (top[1] << 8) | top[2]) / 0x00ffffff;
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return lower + parseInt((upper - lower) * percent);
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}
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function saveTestcase(testcaseName, json) {
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var data = JSON.stringify(json, undefined, ' ');
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var filename = path.join(__dirname, '../tests/', testcaseName + '.json');
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fs.writeFileSync(filename, data);
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console.log('Save testcase: ' + filename);
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}
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module.exports = {
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randomBytes: randomBytes,
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randomHexString: randomHexString,
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randomNumber: randomNumber,
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arrayify: utils.arrayify,
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hexlify: utils.hexlify,
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saveTestcase: saveTestcase,
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};
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