_binaryBlob.js

/**
 * Creates an ArrayBuffer, converts the binary to a Uint8 Array, and
 * places the buffer in a DataView, which is needed to create a Blob
 **/
_makeBlob: function(binary) {
    var data = new ArrayBuffer(binary.length),
        mimeString = "text/plain",
        ui8a =  new Uint8Array(data, 0),
        dataView,
        blob;

    // & is a bit-wise operation
    for (var i = 0; i < binary.length; i++) {
        ui8a[i] = (binary.charCodeAt(i) & 0xff);
    }

    dataView = new DataView(data);

    blob = new Blob([dataView], {type: mimeString});

    return blob;
}