datamatrix: first FNC1 as ascii 232

[mutm]

To support GS1 Datamatrix format

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[makiuchi-d]

Thank you for your contribution.

IMO, it should be indicated by EncodeHintType_GS1_FORMAT rather than a charactor \u00e8.
And it need to implement the decoder support.

I want it be implemented on the original ZXing before this repository.

[gijsbotje]

@makiuchi-d looks like zxing has support for this since Jan 12, 2022, can this be merged?

[makiuchi-d]

@gijsbotje
Thank you for pointing this out.

I may be missing something, but I don’t see a corresponding implementation in the original ZXing code for this change.
https://github.com/zxing/zxing/blob/50799640d5c4d6cd85f75f047a3055d05485fae5/core/src/main/java/com/google/zxing/datamatrix/encoder/HighLevelEncoder.java#L41-L44

Could you please let me know where this is implemented in ZXing?

[gijsbotje]

@makiuchi-d It seems to be in the minimalEncoder in the zxing repo. The GS1_FORMAT is checked in the DatamarixWriter at:
https://github.com/zxing/zxing/blob/50799640d5c4d6cd85f75f047a3055d05485fae5/core/src/main/java/com/google/zxing/datamatrix/DataMatrixWriter.java#L92

And passed to a minimalEncoder when hasCompactionHint is true, at:
https://github.com/zxing/zxing/blob/50799640d5c4d6cd85f75f047a3055d05485fae5/core/src/main/java/com/google/zxing/datamatrix/DataMatrixWriter.java#L100

I might have misunderstood how this works in the original library as i'm neither a go or java deleloper.

[makiuchi-d]

@gijsbotje Thanks for checking this in detail.
As you showed, in the original ZXing it is implemented in a completely different way.
We will need to port the entire MinimalEncoder and its related code.

[gijsbotje]

@makiuchi-d i've implemented the minimalEncoder in #78 and made a few other changes to make work more like the java implemetation.