read-excel-file/commonjs/xlsx/file/validateLeadingBytes.js

Read `.xlsx` files in a web browser or in Node.js

"use strict";

function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = validateLeadingBytes;
exports.noFileTypeCouldBeDetermined = noFileTypeCouldBeDetermined;
exports.validateByte = validateByte;
var _InvalidInputError = _interopRequireDefault(require("./InvalidInputError.js"));
var _createFileTypeDetector = _interopRequireWildcard(require("./createFileTypeDetector.js"));
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
function _createForOfIteratorHelperLoose(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (it) return (it = it.call(o)).next.bind(it); if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; return function () { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; } // This code was originally submitted by Etienne Prothon.
// https://gitlab.com/catamphetamine/read-excel-file/-/merge_requests/11
function validateLeadingBytes(bytes) {
  var fileTypeDetector = (0, _createFileTypeDetector["default"])();
  for (var _iterator = _createForOfIteratorHelperLoose(bytes), _step; !(_step = _iterator()).done;) {
    var _byte = _step.value;
    if (validateByte(_byte, fileTypeDetector)) {
      return;
    }
  }
  noFileTypeCouldBeDetermined(bytes.length);
}
function validateByte(_byte2, fileTypeDetector) {
  var fileType = fileTypeDetector(_byte2);
  if (fileType !== undefined) {
    // If it has determined that the file type is `.xls`.
    if (fileType === _createFileTypeDetector.XLS_FILE_TYPE) {
      throw new _InvalidInputError["default"]('XLS_FILE_NOT_SUPPORTED');
    }
    // If it has determined that the file type is none of the known ones.
    if (fileType < 0) {
      throw new _InvalidInputError["default"]('FILE_NOT_SUPPORTED');
    }
    return true;
  }
}
function noFileTypeCouldBeDetermined(byteCount) {
  // The file type couldn't be determined — not enough bytes.
  throw new _InvalidInputError["default"](byteCount === 0 ? 'NO_DATA' : 'FILE_NOT_SUPPORTED');
}
//# sourceMappingURL=validateLeadingBytes.js.map