Files F120463766

BatchedHash.js
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Created: Fri, Jul 4, 14:09

BatchedHash.js
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	const MAX_SHORT_STRING = require("./wasm-hash").MAX_SHORT_STRING;

	class BatchedHash {
	constructor(hash) {
	this.string = undefined;
	this.encoding = undefined;
	this.hash = hash;
	}

	/**
	* Update hash {@link https://nodejs.org/api/crypto.html#crypto_hash_update_data_inputencoding}
	* @param {string\|Buffer} data data
	* @param {string=} inputEncoding data encoding
	* @returns {this} updated hash
	*/
	update(data, inputEncoding) {
	if (this.string !== undefined) {
	if (
	typeof data === "string" &&
	inputEncoding === this.encoding &&
	this.string.length + data.length < MAX_SHORT_STRING
	) {
	this.string += data;

	return this;
	}

	this.hash.update(this.string, this.encoding);
	this.string = undefined;
	}

	if (typeof data === "string") {
	if (
	data.length < MAX_SHORT_STRING &&
	// base64 encoding is not valid since it may contain padding chars
	(!inputEncoding \|\| !inputEncoding.startsWith("ba"))
	) {
	this.string = data;
	this.encoding = inputEncoding;
	} else {
	this.hash.update(data, inputEncoding);
	}
	} else {
	this.hash.update(data);
	}

	return this;
	}

	/**
	* Calculates the digest {@link https://nodejs.org/api/crypto.html#crypto_hash_digest_encoding}
	* @param {string=} encoding encoding of the return value
	* @returns {string\|Buffer} digest
	*/
	digest(encoding) {
	if (this.string !== undefined) {
	this.hash.update(this.string, this.encoding);
	}

	return this.hash.digest(encoding);
	}
	}

	module.exports = BatchedHash;

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