exif js fix for multiple exif segments

    function findEXIFinJPEG(file) {
        var dataView = new DataView(file);

        if (debug) console.log("Got file of length " + file.byteLength);
        if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
            if (debug) console.log("Not a valid JPEG");
            return false; // not a valid jpeg
        }

        var offset = 2,
            length = file.byteLength,
            marker;

        var exifs = [];
        while (offset < length) {
            if (dataView.getUint8(offset) != 0xFF) {
                if (debug) console.log("Not a valid marker at offset " + offset + ", found: " + dataView.getUint8(offset));
                return false; // not a valid marker, something is wrong
            }

            marker = dataView.getUint8(offset + 1);
            if (debug) console.log(marker);

            // we could implement handling for other markers here,
            // but we're only looking for 0xFFE1 for EXIF data

            if (marker == 225) {
                if (debug) console.log("Found 0xFFE1 marker");

                exifs.push(readEXIFData(dataView, offset + 4, dataView.getUint16(offset + 2) - 2));

                offset += 2 + file.getShortAt(offset+2, true);

            } else {
                offset += 2 + dataView.getUint16(offset+2);
            }

        }
        
        return exifs;
    }