[barcode] [Fwd: improvements/bugfixes upon barcode-0.96]
Boszormenyi Zoltan
zboszor@externet.hu
Thu, 09 Aug 2001 09:38:57 +0200
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I sent this to rubini@gnu.org first, but I got no reply.
Alessandro may be on holiday.
Boszormenyi Zoltan wrote:
> Hi!
>
> Here is a big patch that improves upon barcode-0.96.
>
> The improvements/bugfixes are:
>
> - I found that barcode-0.96 does not correctly encodes UPC-E.
> This was mainly because in upc_e_to_a() the switch() branches
> all ended without "break;".
>
> - Printing UPC-E did not print the leading encoding number and
> the trailing UPC-A checksum. Now it does.
>
> - Accept EAN-13 and EAN-8 with and without the checksum.
> So always treat 7 and 12 digit sequences as valid EAN codes
> and accept 8 and 13 digit sequences as valid EAN codes when
> the last digit is the same as the calculated one.
>
> - Accept UPC-A as above (11 or 12 digit sequences.)
>
> - Accepts UPC-E as:
> 6 digit sequence: the middle part of the barcode. A leading '0' assumed.
> 7 digit sequence: the middle part and either a leading '0' or '1',
> or a trailing UPC-A checksum. In the latter case, a leading '0'
> assumed.
> 8 digit sequence: a leading '0' or '1', the middle part and the trailing
> UPC-A checksum.
- And since a 7 or 12 digit sequence is ambiguous, UPC is checked before EAN
if
you specify BARCODE_ANY.
To clarify: the above four are because my scanner's default is that it
transfers
the checksum and an ENTER after the barcode. I find it convenient to be able
to type:
barcode -E -b "" -o something.eps
and go between the quotes and read the barcode with my scanner. It is
connected
to the keyboard. :-) So I can automatically reprint the barcode in the
correct standard.
>
> - According to http://www.barcodeisland.com/upce.phtml ,
>
> " ... UPC-E may only be used if the number system is 0 or 1."
>
> For number system (or encoding) 1, the parity table is inverted,
> e.g. when the UPC-A checksum is 0, the parity is "---111" as in
> upc_mirrortab[0] (in ean.c) for encoding '0'. For encoding '1',
> this would be "111---", and so on. For compliance, I implemented this.
>
> Unfortunately, my scanner cannot read these kinds of barcodes.
> Please, look at it, I may have made it wrong.
>
> - According to http://www.barcodeisland.com/upcext.phtml ,
>
> " UPC-A, UPC-E, EAN-13, and EAN-8 may all include
> an additional barcode to the right of the main barcode. "
>
> So accept and print the 2 or 5-digit add-ons in every case.
> My scanner reads all following barcodes correctly:
> 04252614 12 UPC-E
> 04252614 12345 UPC-E
> 12345670 12 EAN-8
> 12345670 12345 EAN-8
> 012345678905 12 UPC-A
> 012345678905 12345 UPC-A
> 0123456789012 12 EAN-13
> 0123456789012 12345 EAN-13
> These were printed on a Canon BJC-250, a middle-to-low quality
> bubble-jet printer. Although the barcodes all have visible
> stairs, the scanner was able to read them without problems.
>
> - If you print as Encapsulated Postscript, do not write "showpage\n"
> because this way a Postscript file can "run" (or include / embed) it
> without
> problems. GhostScript / GV gave me errors because of this.
>
> Regards,
> Zoltan Boszormenyi <zboszor@mail.externet.hu>
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