Add support for function codes

[fttx]

Zxing alredy supports FNC1, FNC2, ecc. codes, but they're not passed by the phonegap-barcode-scanner plugin.

See:

• https://github.com/zxing/zxing/blob/0cf3b9be71680f50c90a71ca26ce0d33664b0dd6/android/src/com/google/zxing/client/android/CaptureActivity.java#L446
• https://github.com/zxing/zxing/blob/0cf3b9be71680f50c90a71ca26ce0d33664b0dd6/core/src/main/java/com/google/zxing/oned/Code128Reader.java#L529

Sample barcode:

Raw value:

barcodeScanResult.text value:

Hex: (read by columns)

There I do not see the FNC1 codes. But if I analyze the frame in hexadecimal after acquisition on our application via Barcode to PC Server:

At the start of the bar code, I see 3 non-printable characters but it does not correspond to ]C1 (hexadecimal B5 C3 F1). In the body of the bar command, I do not see the non-printable character corresponding to the 1D hexadecimal.

[fttx]

Zxing has the ASSUME_GS1 option that enables the FNC characters decoding: https://github.com/zxing/zxing/blob/0cf3b9be71680f50c90a71ca26ce0d33664b0dd6/core/src/main/java/com/google/zxing/oned/Code128Reader.java#L239

Problem is, it supports only few FNC characters. It will output the non printable character using the SCAN_RESULT_BYTES array

[fttx]

To convert the FNC1 characters so that parenthesis are shown around the fields use this template:

GS1 Support.btpt.zip