Add support for GS-1 encoding via the FCN1 character #10
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This patch adds the ability to encode GS-1 barcodes using the FNC1 character, which is defined by the new property 'DmtxPropFnc1' and defaulted to 'DmtxUndefined'. Once set, the specified character within the text of the barcode will be replaced with FNC1. GS-1 encoding is valid for all barcode encodings, however FNC1 is only valid for ASCII and C40/Text. Code will automatically escape to ASCII where needed and is transparent for user. An additional patch for dmtxutils is provided, using the command line parameter '-G xx' allows user to specify the character they wish to use/replace for FNC1. Example use - '+' will be replaced FNC1: $ echo -n '+0010030378123456789017130700103033262+3000017' | dmtxwrite -o test.png -G 43 and decoding replacing FNC1 with '*' (for validation): $ dmtxread test.png -G 42 *0010030378123456789017130700103033262*3000017 Note: FNC1 is implied at the end of fixed length AI's, so is only required to mark end of variable length AI's.
This was referenced Mar 24, 2018
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sh4dowb
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Aug 3, 2023
dmtx/libdmtx#10 Simply pushing \x1d will result in ASCII RS codeword (030) instead of actual FNC1 codeword (232), this commit allows GS1 encoding. `fnc1=29` can be used to substitute \x1d
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This patch adds the ability to encode GS-1 barcodes using the FNC1
character, which is defined by the new property 'DmtxPropFnc1' and
defaulted to 'DmtxUndefined'. Once set, the specified character
within the text of the barcode will be replaced with FNC1.
GS-1 encoding is valid for all barcode encodings, however FNC1 is
only valid for ASCII and C40/Text. Code will automatically escape to
ASCII where needed and is transparent for user.
An additional patch for dmtxutils is provided, using the command line
parameter '-G xx' allows user to specify the character they wish to
use/replace for FNC1.
Example use - '+' will be replaced FNC1:
$ echo -n '+0010030378123456789017130700103033262+3000017' | dmtxwrite -o test.png -G 43and decoding replacing FNC1 with '*' (for validation):
Note: FNC1 is implied at the end of fixed length AI's, so is only
required to mark end of variable length AI's.