source: frontend/node_modules/webpack/lib/util/hash/BatchedHash.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/

"use strict";

const Hash = require("../Hash");
const { digest, update } = require("./hash-digest");
/** @type {number} */
const MAX_SHORT_STRING = require("./wasm-hash").MAX_SHORT_STRING;

/** @typedef {import("../../../declarations/WebpackOptions").HashDigest} Encoding */

class BatchedHash extends Hash {
        /**
         * Creates an instance of BatchedHash.
         * @param {Hash} hash hash
         */
        constructor(hash) {
                super();
                /** @type {undefined | string} */
                this.string = undefined;
                /** @type {undefined | Encoding} */
                this.encoding = undefined;
                /** @type {Hash} */
                this.hash = hash;
        }

        /**
         * Update hash {@link https://nodejs.org/api/crypto.html#crypto_hash_update_data_inputencoding}
         * @overload
         * @param {string | Buffer} data data
         * @returns {Hash} updated hash
         */
        /**
         * Update hash {@link https://nodejs.org/api/crypto.html#crypto_hash_update_data_inputencoding}
         * @overload
         * @param {string} data data
         * @param {Encoding} inputEncoding data encoding
         * @returns {Hash} updated hash
         */
        /**
         * Update hash {@link https://nodejs.org/api/crypto.html#crypto_hash_update_data_inputencoding}
         * @param {string | Buffer} data data
         * @param {Encoding=} inputEncoding data encoding
         * @returns {Hash} 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;
                        }
                        if (this.encoding) {
                                update(this.hash, this.string, this.encoding);
                        } else {
                                update(this.hash, this.string);
                        }
                        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 if (inputEncoding) {
                                update(this.hash, data, inputEncoding);
                        } else {
                                update(this.hash, data);
                        }
                } else {
                        update(this.hash, data);
                }
                return this;
        }

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

module.exports = BatchedHash;