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Viewing file:     BatchedHash.js (1.61 KB)      -rw-r--r--

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;