UNPKG

tedious

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A TDS driver, for connecting to MS SQLServer databases.

104 lines (102 loc) 15.3 kB
"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.default = void 0; var _token = require("./token"); var iconv = _interopRequireWildcard(require("iconv-lite")); var _valueParser = require("../value-parser"); var _helpers = require("./helpers"); function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return null; var r = new WeakMap(), t = new WeakMap(); return (_getRequireWildcardCache = function (e) { return e ? t : r; })(e); } function _interopRequireWildcard(e, r) { if (!r && e && e.__esModule) return e; if (null === e || "object" != typeof e && "function" != typeof e) return { default: e }; var t = _getRequireWildcardCache(r); if (t && t.has(e)) return t.get(e); var n = { __proto__: null }, a = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var u in e) if ("default" !== u && Object.prototype.hasOwnProperty.call(e, u)) { var i = a ? Object.getOwnPropertyDescriptor(e, u) : null; i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u]; } return n.default = e, t && t.set(e, n), n; } // s2.2.7.13 (introduced in TDS 7.3.B) async function nbcRowParser(parser) { const colMetadata = parser.colMetadata; const columns = []; const bitmap = []; const bitmapByteLength = Math.ceil(colMetadata.length / 8); while (parser.buffer.length - parser.position < bitmapByteLength) { await parser.waitForChunk(); } const bytes = parser.buffer.slice(parser.position, parser.position + bitmapByteLength); parser.position += bitmapByteLength; for (let i = 0, len = bytes.length; i < len; i++) { const byte = bytes[i]; bitmap.push(byte & 0b1 ? true : false); bitmap.push(byte & 0b10 ? true : false); bitmap.push(byte & 0b100 ? true : false); bitmap.push(byte & 0b1000 ? true : false); bitmap.push(byte & 0b10000 ? true : false); bitmap.push(byte & 0b100000 ? true : false); bitmap.push(byte & 0b1000000 ? true : false); bitmap.push(byte & 0b10000000 ? true : false); } for (let i = 0; i < colMetadata.length; i++) { const metadata = colMetadata[i]; if (bitmap[i]) { columns.push({ value: null, metadata }); continue; } while (true) { if ((0, _valueParser.isPLPStream)(metadata)) { const chunks = await (0, _valueParser.readPLPStream)(parser); if (chunks === null) { columns.push({ value: chunks, metadata }); } else if (metadata.type.name === 'NVarChar' || metadata.type.name === 'Xml') { columns.push({ value: Buffer.concat(chunks).toString('ucs2'), metadata }); } else if (metadata.type.name === 'VarChar') { columns.push({ value: iconv.decode(Buffer.concat(chunks), metadata.collation?.codepage ?? 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