UNPKG

tedious

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A TDS driver, for connecting to MS SQLServer databases.

144 lines (141 loc) • 17 kB
"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.default = void 0; var _plpStream = require("./plp-stream"); const MAX = (1 << 16) - 1; const UNKNOWN_PLP_LEN = Buffer.from([0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]); const PLP_TERMINATOR = Buffer.from([0x00, 0x00, 0x00, 0x00]); const NULL_LENGTH = Buffer.from([0xFF, 0xFF]); const MAX_NULL_LENGTH = Buffer.from([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]); const NO_COLLATION = Buffer.alloc(5); function encodeUcs2(chunk) { if (typeof chunk !== 'string') { throw new TypeError('Invalid string.'); } return Buffer.from(chunk, 'ucs2'); } const NVarChar = { id: 0xE7, type: 'NVARCHAR', name: 'NVarChar', maximumLength: 4000, declaration: function (parameter) { const value = parameter.value; // Temporary solution. Remove 'any' later. if ((0, _plpStream.isAsyncIterable)(value)) { return 'nvarchar(max)'; } let length; if (parameter.length) { length = parameter.length; } else if (value != null) { length = value.toString().length || 1; } else if (value === null && !parameter.output) { length = 1; } else { length = this.maximumLength; } if (length <= this.maximumLength) { return 'nvarchar(' + length + ')'; } else { return 'nvarchar(max)'; } }, resolveLength: function (parameter) { const value = parameter.value; // Temporary solution. Remove 'any' later. if (parameter.length != null) { return parameter.length; } else if (value != null) { if (Buffer.isBuffer(value)) { return value.length / 2 || 1; } else { return value.toString().length || 1; } } else { return this.maximumLength; } }, writeTypeInfo(buffer, parameter) { buffer.writeUInt8(this.id); if (parameter.length <= this.maximumLength) { buffer.writeUInt16LE(parameter.length * 2); } else { buffer.writeUInt16LE(MAX); } if (parameter.collation) { buffer.writeBuffer(parameter.collation.toBuffer().subarray(0, 5)); } else { buffer.writeBuffer(NO_COLLATION); } }, writeValue(buffer, parameter) { if (parameter.value == null) { buffer.writeBuffer(parameter.length <= this.maximumLength ? NULL_LENGTH : MAX_NULL_LENGTH); return; } // Read from its source while the request is written; `resolve` declared // it as `nvarchar(max)`. if ((0, _plpStream.isAsyncIterable)(parameter.value)) { return (0, _plpStream.writePlpStream)(buffer, parameter.value, encodeUcs2); } const value = parameter.value instanceof Buffer ? parameter.value : parameter.value.toString(); const length = typeof value === 'string' ? value.length * 2 : value.length; if (parameter.length <= this.maximumLength) { buffer.writeUInt16LE(length); } else { buffer.writeBuffer(UNKNOWN_PLP_LEN); if (length === 0) { buffer.writeBuffer(PLP_TERMINATOR); return; } buffer.writeUInt32LE(length); } if (typeof value === 'string') { buffer.writeString(value, 'ucs2'); } else { buffer.writeBuffer(value); } if (parameter.length > this.maximumLength) { buffer.writeBuffer(PLP_TERMINATOR); } }, validate: function (value) { if (value == null) { return null; } if (typeof value !== 'string') { throw new TypeError('Invalid string.'); } return value; }, resolve(parameter, collation) { if ((0, _plpStream.isAsyncIterable)(parameter.value)) { // Read from its source while the request is written, and sent as // `nvarchar(max)` since its length is not known up front. const data = { value: parameter.value, length: MAX }; if (collation) { data.collation = collation; } return data; } const value = this.validate(parameter.value, collation); const data = { value }; data.length = parameter.length != null ? parameter.length : this.resolveLength({ ...parameter, value }); if (collation) { data.collation = collation; } return data; } }; var _default = exports.default = NVarChar; module.exports = NVarChar; //# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["_plpStream","require","MAX","UNKNOWN_PLP_LEN","Buffer","from","PLP_TERMINATOR","NULL_LENGTH","MAX_NULL_LENGTH","NO_COLLATION","alloc","encodeUcs2","chunk","TypeError","NVarChar","id","type","name","maximumLength","declaration","parameter","value","isAsyncIterable","length","toString","output","resolveLength","isBuffer","writeTypeInfo","buffer","writeUInt8","writeUInt16LE","collation","writeBuffer","toBuffer","subarray","writeValue","writePlpStream","writeUInt32LE","writeString","validate","resolve","data","_default","exports","default","module"],"sources":["../../src/data-types/nvarchar.ts"],"sourcesContent":["import { type DataType, type ParameterData } from '../data-type';\nimport { isAsyncIterable, writePlpStream } from './plp-stream';\n\nconst MAX = (1 << 16) - 1;\nconst UNKNOWN_PLP_LEN = Buffer.from([0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]);\nconst PLP_TERMINATOR = Buffer.from([0x00, 0x00, 0x00, 0x00]);\n\nconst NULL_LENGTH = Buffer.from([0xFF, 0xFF]);\nconst MAX_NULL_LENGTH = Buffer.from([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]);\nconst NO_COLLATION = Buffer.alloc(5);\n\nfunction encodeUcs2(chunk: unknown): Buffer {\n  if (typeof chunk !== 'string') {\n    throw new TypeError('Invalid string.');\n  }\n  return Buffer.from(chunk, 'ucs2');\n}\n\nconst NVarChar: { maximumLength: number } & DataType = {\n  id: 0xE7,\n  type: 'NVARCHAR',\n  name: 'NVarChar',\n  maximumLength: 4000,\n\n  declaration: function(parameter) {\n    const value = parameter.value as any; // Temporary solution. 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