Function getBinaryImageMetadata

docs/app/js/sanddance-app.js:57781–57784

(binaryData)

var BIG_ENDIAN = false;
var LITTLE_ENDIAN = true;
function getBinaryImageMetadata(binaryData) {
    var dataView = toDataView(binaryData);
    return getPngMetadata(dataView) || getJpegMetadata(dataView) || getGifMetadata(dataView) || getBmpMetadata(dataView);
}
function getPngMetadata(binaryData) {
    var dataView = toDataView(binaryData);
    var isPng = dataView.byteLength >= 24 && dataView.getUint32(0, BIG_ENDIAN) === 0x89504e47;