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// Author: cirakg & claude ai
// Summary: Code 39 encoder: 43 characters, optional mod-43 check character, wide bars 2 modules (as zxing).
import Toybox.Lang;
module Code39 {
const ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%"; // lint: allow-literal (Code 39 character set)
// Nine elements per character, bit 8 first, 1 = wide; index 43 is '*'.
const PATTERNS = [
0x034, 0x121, 0x061, 0x160, 0x031, 0x130, 0x070, 0x025, 0x124, 0x064,
0x109, 0x049, 0x148, 0x019, 0x118, 0x058, 0x00D, 0x10C, 0x04C, 0x01C,
0x103, 0x043, 0x142, 0x013, 0x112, 0x052, 0x007, 0x106, 0x046, 0x016,
0x181, 0x0C1, 0x1C0, 0x091, 0x190, 0x0D0, 0x085, 0x184, 0x0C4, 0x0A8,
0x0A2, 0x08A, 0x02A, 0x094
];
const STAR = 43;
// withCheck adds the mod-43 check character (the sum of the character
// values modulo 43).
function encode(text as String, withCheck as Boolean) as Codes.LinearCode or Codes.CodeError {
var chars = text.toCharArray();
if (chars.size() == 0) {
return new Codes.CodeError("Code 39 needs some text");
}
var values = [] as Array<Number>;
var sum = 0;
for (var i = 0; i < chars.size(); i++) {
var v = ALPHABET.find(chars[i].toString());
if (v == null) {
return new Codes.CodeError("Code 39: '" + chars[i] + "' (position " + (i + 1)
+ ") isn't allowed (0-9, A-Z, space, - . $ / + %)");
}
values.add(v);
sum += v;
}
var readable = text;
if (withCheck) {
values.add(sum % 43);
readable += ALPHABET.substring(sum % 43, sum % 43 + 1);
}
var m = []b;
addChar(m, STAR);
for (var i = 0; i < values.size(); i++) {
m.add(0); // narrow gap between characters
addChar(m, values[i]);
}
m.add(0);
addChar(m, STAR);
return new Codes.LinearCode(m, readable);
}
function addChar(m as ByteArray, value as Number) as Void {
var pattern = PATTERNS[value] as Number;
for (var i = 8; i >= 0; i--) {
var width = ((pattern >> i) & 1) == 1 ? 2 : 1;
var bar = (8 - i) % 2 == 0;
for (var k = 0; k < width; k++) {
m.add(bar ? 1 : 0);
}
}
}
}
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