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// Utilities
// =========
// Helper that uses FileReader or FileReaderSync based on context and returns
// a Promise that resolves with the text or rejects with error.
function readAsText(blob) {
if (typeof FileReader !== "undefined") {
return new Promise(function (resolve, reject) {
var fs = new FileReader();
fs.onload = function () {
resolve(fs.result);
};
fs.onerror = reject;
fs.readAsText(blob);
});
} else {
var fs = new FileReaderSync();
return Promise.resolve(fs.readAsText(blob));
}
}
function readAsArrayBuffer(blob) {
if (typeof FileReader !== "undefined") {
return new Promise(function (resolve, reject) {
var fs = new FileReader();
fs.onload = function () {
resolve(fs.result);
};
fs.onerror = reject;
fs.readAsArrayBuffer(blob);
});
} else {
var fs = new FileReaderSync();
return Promise.resolve(fs.readAsArrayBuffer(blob));
}
}
function waitForState(worker, state, context) {
return new Promise(resolve => {
if (worker.state === state) {
resolve(context);
return;
}
worker.addEventListener("statechange", function onStateChange() {
if (worker.state === state) {
worker.removeEventListener("statechange", onStateChange);
resolve(context);
}
});
});
}
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