Codabar, encoding of '+' is wrong

[rob313663]

Hi!

Codabar_Code.Add('.', "1101101101");//"110101100101"); Codabar_Code.Add('+', "101100110011");//"101101100101");

From https://web.archive.org/web/20060512120028/http://www.barcodesymbols.com/codabar.htm: " + 0 0 1 0 1 0 1 15"

It shoulde be: "1011011011" in BarcodeLib notation (tested it with a barcode reader).

The comments after all the codewords in Codabar do not correspond to the value, so why are they there at all?

Anyway, BarcodeLib encoding has a design problem in the codewords encoding, same in Code 39 and Interleave 2 of 5, it encodes everything as bits, and not as wide and narrow, which for the Codabar means this can't be implemented:

"The original Pitney-Bowes specification actually varies the narrow:wide width ratio to make all characters the same width. That is, characters with 2 wide elements use a 3:1 ratio, while characters with 3 wide elements use a 2:1 ratio, so all characters are 10 narrow elements wide (plus the inter-character space makes 11). "Rationalized codabar" uses a fixed ratio and allows the character widths to vary."

Attached is an image where the wide to narrow ratio is 3:1 for codewords with two wide elements and 2:1 for codewords with three wide elements.

Here is my codeword table for Codabar:

private static void InitCodeWordPatterns() { // Encoding character as bBsS where b or B means bar and s or S means space. // Upper case means it is a wide element. Lower case is a narrow element. codewordPatterns = new Dictionary<char, CodabarCodeWord> { { '0', new CodabarCodeWord() { Pattern = "bsbsbSB", CodeWordValue = 0 }}, { '1', new CodabarCodeWord() { Pattern = "bsbsBSb", CodeWordValue = 1 }}, { '2', new CodabarCodeWord() { Pattern = "bsbSbsB", CodeWordValue = 2 }}, { '3', new CodabarCodeWord() { Pattern = "BSbsbsb", CodeWordValue = 3 }}, { '4', new CodabarCodeWord() { Pattern = "bsBsbSb", CodeWordValue = 4 }}, { '5', new CodabarCodeWord() { Pattern = "BsbsbSb", CodeWordValue = 5 }}, { '6', new CodabarCodeWord() { Pattern = "bSbsbsB", CodeWordValue = 6 }}, { '7', new CodabarCodeWord() { Pattern = "bSbsBsb", CodeWordValue = 7 }}, { '8', new CodabarCodeWord() { Pattern = "bSBsbsb", CodeWordValue = 8 }}, { '9', new CodabarCodeWord() { Pattern = "BsbSbsb", CodeWordValue = 9 }}, { '-', new CodabarCodeWord() { Pattern = "bsbSBsb", CodeWordValue = 10 }}, { '$', new CodabarCodeWord() { Pattern = "bsBSbsb", CodeWordValue = 11 }}, { ':', new CodabarCodeWord() { Pattern = "BsbsBsB", CodeWordValue = 12 }}, { '/', new CodabarCodeWord() { Pattern = "BsBsbsB", CodeWordValue = 13 }}, { '.', new CodabarCodeWord() { Pattern = "BsBsBsb", CodeWordValue = 14 }}, { '+', new CodabarCodeWord() { Pattern = "bsBsBsB", CodeWordValue = 15 }}, { 'A', new CodabarCodeWord() { Pattern = "bsBSbSb", CodeWordValue = 16 }}, { 'B', new CodabarCodeWord() { Pattern = "bSbSbsB", CodeWordValue = 17 }}, { 'C', new CodabarCodeWord() { Pattern = "bsbSbSB", CodeWordValue = 18 }}, { 'D', new CodabarCodeWord() { Pattern = "bsbSBSb", CodeWordValue = 19 }}, };

Codabar.codeWordToChar = Codabar.InitCodeWordToChar();

}

[rob313663]

The image shows the x2 or x3 width of wide elements depending on how many wide elements there are in the code word.

[barnhill]

Good find on the + symbol being encoded incorrectly ... Ive merged a change to fix that encoding and will push a new version out soon.

[barnhill]

Fixed by https://github.com/barnhill/barcodelib/commit/8b3c739077971026e543ec3e2646ce21713c6c54

[barnhill]

Published 3.0.1 to nuget should be out soon as its approved by MS