Method digest

lib/util/hash/BulkUpdateHash.js:112–143

* Calculates the digest {@link https://nodejs.org/api/crypto.html#crypto_hash_digest_encoding} * @param {Encoding=} encoding encoding of the return value * @returns {string | Buffer} digest

(encoding)

	 * @returns {string | Buffer} digest
	 */
	digest(encoding) {
		/** @type {undefined | Map<string, string | Buffer>} */
		let digestCache;
		const buffer = this.buffer;
		if (this.hash === undefined) {
			// short data for hash, we can use caching
			const cacheKey = `${this.hashKey}-${encoding}`;
			digestCache = digestCaches[cacheKey];
			if (digestCache === undefined) {
				digestCache = digestCaches[cacheKey] = new Map();
			}
			const cacheEntry = digestCache.get(buffer);
			if (cacheEntry !== undefined) return cacheEntry;
			this.hash = /** @type {HashFactory} */ (this.hashFactory)();
		}

		if (buffer.length > 0) {
			update(this.hash, buffer);
		}
		if (!encoding) {
			const result = digest(this.hash, undefined, Boolean(this.hashKey));
			if (digestCache !== undefined) {
				digestCache.set(buffer, result);
			}
			return result;
		}
		const result = digest(this.hash, encoding, Boolean(this.hashKey));
		if (digestCache !== undefined) {
			digestCache.set(buffer, result);
		}
		return result;
	}
}

module.exports = BulkUpdateHash;