slimfits/lib/datasource/BlobFile.js

Package for loading data stored in FITS data format

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var interfaces_1 = require("../interfaces");
var ArrayUtils_1 = require("../utils/ArrayUtils");
var BlobFile = /** @class */ (function () {
    function BlobFile(file) {
        this.file = file;
        this.url = '';
        this.url = file.name;
    }
    BlobFile.prototype.initialize = function () {
        var _this = this;
        return this.getStringAsync(0, 6).then(function (value) {
            return (value === 'SIMPLE') && (_this.getByteLength() % 2880 === 0);
        });
    };
    BlobFile.prototype.getByteLength = function () {
        return this.file.size;
    };
    BlobFile.prototype.getStringAsync = function (start, length) {
        var _this = this;
        return new Promise(function (resolve, reject) {
            var blob = _this.file.slice(start, start + length);
            var reader = new FileReader();
            reader.onloadend = function (evt) {
                if (reader.readyState === reader.DONE) {
                    // TODO: check what is the issue here
                    resolve(reader.result);
                }
                else {
                    reject(reader.error);
                }
            };
            return reader.readAsText(blob, 'ASCII');
        });
    };
    BlobFile.prototype.getDataAsync = function (start, length, bitPix, changeEndian) {
        var _this = this;
        if (changeEndian === void 0) { changeEndian = true; }
        return new Promise(function (resolve, reject) {
            var blob = _this.file.slice(start, start + length * interfaces_1.BitPixUtils.getByteSize(bitPix));
            var reader = new FileReader();
            reader.onloadend = function (evt) {
                if (reader.readyState === reader.DONE) {
                    var typedArray = ArrayUtils_1.ArrayUtils.generateTypedArray(bitPix, length);
                    // TODO check if this <any> cast is necessary
                    ArrayUtils_1.ArrayUtils.copy(reader.result, typedArray.buffer, 0, length, bitPix, changeEndian);
                    resolve(typedArray);
                }
                else {
                    reject(reader.error);
                }
            };
            reader.readAsArrayBuffer(blob);
        });
    };
    return BlobFile;
}());
exports.BlobFile = BlobFile;
//# sourceMappingURL=BlobFile.js.map