tedious/lib/token/nbcrow-token-parser.js

A TDS driver, for connecting to MS SQLServer databases.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.NBCRowTokenReader = void 0;
var _token = require("./token");
var _helpers = require("./helpers");
var _rowTokenParser = require("./row-token-parser");
// s2.2.7.13 (introduced in TDS 7.3.B)

/**
 * Reads an `NBCROW` token - a `ROW` token prefixed with a bitmap that flags
 * `null` columns, which then have no data.
 */
class NBCRowTokenReader extends _rowTokenParser.ColumnValuesReader {
  constructor() {
    super();
    this.nullBitmap = undefined;
  }
  read(parser) {
    if (this.nullBitmap === undefined) {
      const start = parser.position;
      const end = start + Math.ceil(parser.colMetadata.length / 8);
      if (parser.buffer.length < end) {
        throw new _helpers.NotEnoughDataError(end);
      }
      this.nullBitmap = parser.buffer.subarray(start, end);
      parser.position = end;
    }
    this.readColumns(parser, this.nullBitmap);
    return new _token.NBCRowToken(parser.options.useColumnNames ? (0, _rowTokenParser.toColumnsMap)(this.columns) : this.columns);
  }
}
exports.NBCRowTokenReader = NBCRowTokenReader;
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