slimfits/lib/datasource/ArrayBufferFile.js

Package for loading data stored in FITS data format

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var ArrayUtils_1 = require("../utils/ArrayUtils");
var ArrayBufferFile = /** @class */ (function () {
    function ArrayBufferFile(data) {
        this.data = data;
    }
    ArrayBufferFile.prototype.initialize = function () {
        var _this = this;
        return this.getStringAsync(0, 6).then(function (value) {
            return (value === 'SIMPLE') && (_this.getByteLength() % 2880 === 0);
        });
    };
    ArrayBufferFile.prototype.getByteLength = function () {
        return this.data != null ? this.data.byteLength : 0;
    };
    ArrayBufferFile.prototype.getStringAsync = function (start, length) {
        return Promise.resolve(String.fromCharCode.apply(null, new Uint8Array(this.data, start, length)));
    };
    ArrayBufferFile.prototype.getDataAsync = function (start, length, bitPix, changeEndian) {
        if (changeEndian === void 0) { changeEndian = true; }
        var typedArray = ArrayUtils_1.ArrayUtils.generateTypedArray(bitPix, length);
        ArrayUtils_1.ArrayUtils.copy(this.data, typedArray.buffer, start, length, bitPix, changeEndian);
        return Promise.resolve(typedArray);
    };
    return ArrayBufferFile;
}());
exports.ArrayBufferFile = ArrayBufferFile;
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