No ads can read inverted codes and can generate barcodes.

Uses the ZXing ("Zebra Crossing") barcode scanning library. Supported barcode formats are: AZTEC CODABAR CODE 39 CODE 93 CODE 128 DATA MATRIX DX FILM EDGE EAN 8 EAN 13 ITF MAXICODE (partial) PDF417 QR CODE Micro QR Code rMQR Code RSS 14 RSS EXPANDED UPC A UPC E UPC EAN EXTENSION

This is open source:
https://github.com/markusfisch/BinaryEye