pinafore/routes/_utils/binary.js
2018-01-07 22:00:20 -08:00

27 lines
792 B
JavaScript

// from blob-util
function blobToBinaryString(blob) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
var hasBinaryString = typeof reader.readAsBinaryString === 'function';
reader.onloadend = function (e) {
var result = e.target.result || '';
if (hasBinaryString) {
return resolve(result);
}
resolve(arrayBufferToBinaryString(result));
};
reader.onerror = reject;
if (hasBinaryString) {
reader.readAsBinaryString(blob);
} else {
reader.readAsArrayBuffer(blob);
}
});
}
export function blobToBase64(blob) {
return blobToBinaryString(blob).then(function (binary) {
// web-safe variant
return btoa(binary).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
});
}