Code 128 generator for Acrobat PDF actions

action.js

var barcode = this.getField("CarrierCode").valueAsString + this.getField("CargoControlNumber").valueAsString

var specification = "code128a"
var fontMapping = "common"

var fromMap = {
  "common": {
    " ": 0, 
    "Â": 0,  "!": 1,  "\"": 2, "#": 3,  "$": 4,  "%": 5,  "&": 6,  "'": 7,
    "(": 8,  ")": 9,  "*": 10, "+": 11, ",": 12, "-": 13, ".": 14, "/": 15,
    "0": 16, "1": 17, "2": 18, "3": 19, "4": 20, "5": 21, "6": 22, "7": 23,
    "8": 24, "9": 25, ":": 26, ";": 27, "<": 28, "=": 29, ">": 30, "?": 31,
    "@": 32, "A": 33, "B": 34, "C": 35, "D": 36, "E": 37, "F": 38, "G": 39,
    "H": 40, "I": 41, "J": 42, "K": 43, "L": 44, "M": 45, "N": 46, "O": 47,
    "P": 48, "Q": 49, "R": 50, "S": 51, "T": 52, "U": 53, "V": 54, "W": 55,
    "X": 56, "Y": 57, "Z": 58, "[": 59, "\\": 60, "]": 61, "^": 62, "_": 63,
    "`": 64, "a": 65, "b": 66, "c": 67, "d": 68, "e": 69, "f": 70, "g": 71,
    "h": 72, "i": 73, "j": 74, "k": 75, "l": 76, "m": 77, "n": 78, "o": 79,
    "p": 80, "q": 81, "r": 82, "s": 83, "t": 84, "u": 85, "v": 86, "w": 87,
    "x": 88, "y": 89, "z": 90, "{": 91, "|": 92, "}": 93, "~": 94, "Ã": 95,
    "Ä": 96, "Å": 97, "Æ": 98, "Ç": 99, "È": 100, "É": 101, "Ê": 102, "Ë": 103,
    "Ì": 104, "Í": 105, "—": 106
  },
  "uncommon": {
    "Ô": 0,  "!": 1,  "\"": 2, "#": 3,  "$": 4,  "%": 5,  "&": 6,  "'": 7,
    "(": 8,  ")": 9,  "*": 10, "+": 11, ",": 12, "-": 13, ".": 14, "/": 15,
    "0": 16, "1": 17, "2": 18, "3": 19, "4": 20, "5": 21, "6": 22, "7": 23,
    "8": 24, "9": 25, ":": 26, ";": 27, "<": 28, "=": 29, ">": 30, "?": 31,
    "@": 32, "A": 33, "B": 34, "C": 35, "D": 36, "E": 37, "F": 38, "G": 39,
    "H": 40, "I": 41, "J": 42, "K": 43, "L": 44, "M": 45, "N": 46, "O": 47,
    "P": 48, "Q": 49, "R": 50, "S": 51, "T": 52, "U": 53, "V": 54, "W": 55,
    "X": 56, "Y": 57, "Z": 58, "[": 59, "\\": 60, "]": 61, "^": 62, "_": 63,
    "`": 64, "a": 65, "b": 66, "c": 67, "d": 68, "e": 69, "f": 70, "g": 71,
    "h": 72, "i": 73, "j": 74, "k": 75, "l": 76, "m": 77, "n": 78, "o": 79,
    "p": 80, "q": 81, "r": 82, "s": 83, "t": 84, "u": 85, "v": 86, "w": 87,
    "x": 88, "y": 89, "z": 90, "{": 91, "|": 92, "}": 93, "~": 94, "È": 95,
    "É": 96, "Ê": 97, "Ë": 98, "Ì": 99, "Í": 100, "Î": 101, "Ï": 102, "Ð": 103,
    "Ñ": 104, "Ò": 105, "—": 106
  },
  "barcodesoft": {
    "ü": 0,  "!": 1,  "\"": 2, "#": 3,  "$": 4,  "%": 5,  "&": 6,  "'": 7,
    "(": 8,  ")": 9,  "*": 10, "+": 11, ",": 12, "-": 13, ".": 14, "/": 15,
    "0": 16, "1": 17, "2": 18, "3": 19, "4": 20, "5": 21, "6": 22, "7": 23,
    "8": 24, "9": 25, ":": 26, ";": 27, "<": 28, "=": 29, ">": 30, "?": 31,
    "@": 32, "A": 33, "B": 34, "C": 35, "D": 36, "E": 37, "F": 38, "G": 39,
    "H": 40, "I": 41, "J": 42, "K": 43, "L": 44, "M": 45, "N": 46, "O": 47,
    "P": 48, "Q": 49, "R": 50, "S": 51, "T": 52, "U": 53, "V": 54, "W": 55,
    "X": 56, "Y": 57, "Z": 58, "[": 59, "\\": 60, "]": 61, "^": 62, "_": 63,
    "`": 64, "a": 65, "b": 66, "c": 67, "d": 68, "e": 69, "f": 70, "g": 71,
    "h": 72, "i": 73, "j": 74, "k": 75, "l": 76, "m": 77, "n": 78, "o": 79,
    "p": 80, "q": 81, "r": 82, "s": 83, "t": 84, "u": 85, "v": 86, "w": 87,
    "x": 88, "y": 89, "z": 90, "{": 91, "|": 92, "}": 93, "~": 94, "ð": 95,
    "ñ": 96, "ò": 97, "ó": 98, "ô": 99, "õ": 100, "ö": 101, "÷": 102, "ø": 103,
    "ù": 104, "ú": 105, "—": 106
  }
}

var toMap ={
  "common": {
    0: " ",  1: "!",  2: "\"", 3: "#",  4: "$",  5: "%",  6: "&",  7: "'",
    8: "(",  9: ")",  10: "*", 11: "+", 12: ",", 13: "-", 14: ".", 15: "/",
    16: "0", 17: "1", 18: "2", 19: "3", 20: "4", 21: "5", 22: "6", 23: "7",
    24: "8", 25: "9", 26: ":", 27: ";", 28: "<", 29: "=", 30: ">", 31: "?",
    32: "@", 33: "A", 34: "B", 35: "C", 36: "D", 37: "E", 38: "F", 39: "G",
    40: "H", 41: "I", 42: "J", 43: "K", 44: "L", 45: "M", 46: "N", 47: "O",
    48: "P", 49: "Q", 50: "R", 51: "S", 52: "T", 53: "U", 54: "V", 55: "W",
    56: "X", 57: "Y", 58: "Z", 59: "[", 60: "\\", 61: "]", 62: "^", 63: "_",
    64: "`", 65: "a", 66: "b", 67: "c", 68: "d", 69: "e", 70: "f", 71: "g",
    72: "h", 73: "i", 74: "j", 75: "k", 76: "l", 77: "m", 78: "n", 79: "o",
    80: "p", 81: "q", 82: "r", 83: "s", 84: "t", 85: "u", 86: "v", 87: "w",
    88: "x", 89: "y", 90: "z", 91: "{", 92: "|", 93: "}", 94: "~", 95: "Ã",
    96: "Ä", 97: "Å", 98: "Æ", 99: "Ç", 100: "È", 101: "É", 102: "Ê", 103: "Ë",
    104: "Ì", 105: "Í", 106: "—"
  },
  "uncommon": {
    0: "Ô",  1: "!",  2: "\"", 3: "#",  4: "$",  5: "%",  6: "&",  7: "'",
    8: "(",  9: ")",  10: "*", 11: "+", 12: ",", 13: "-", 14: ".", 15: "/",
    16: "0", 17: "1", 18: "2", 19: "3", 20: "4", 21: "5", 22: "6", 23: "7",
    24: "8", 25: "9", 26: ":", 27: ";", 28: "<", 29: "=", 30: ">", 31: "?",
    32: "@", 33: "A", 34: "B", 35: "C", 36: "D", 37: "E", 38: "F", 39: "G",
    40: "H", 41: "I", 42: "J", 43: "K", 44: "L", 45: "M", 46: "N", 47: "O",
    48: "P", 49: "Q", 50: "R", 51: "S", 52: "T", 53: "U", 54: "V", 55: "W",
    56: "X", 57: "Y", 58: "Z", 59: "[", 60: "\\", 61: "]", 62: "^", 63: "_",
    64: "`", 65: "a", 66: "b", 67: "c", 68: "d", 69: "e", 70: "f", 71: "g",
    72: "h", 73: "i", 74: "j", 75: "k", 76: "l", 77: "m", 78: "n", 79: "o",
    80: "p", 81: "q", 82: "r", 83: "s", 84: "t", 85: "u", 86: "v", 87: "w",
    88: "x", 89: "y", 90: "z", 91: "{", 92: "|", 93: "}", 94: "~", 95: "È",
    96: "É", 97: "Ê", 98: "Ë", 99: "Ì", 100: "Í", 101: "Î", 102: "Ï", 103: "Ð",
    104: "Ñ", 105: "Ò", 106: "—"
  },
  "barcodesoft": {
    0: "ü",  1: "!",  2: "\"", 3: "#",  4: "$",  5: "%",  6: "&",  7: "'",
    8: "(",  9: ")",  10: "*", 11: "+", 12: ",", 13: "-", 14: ".", 15: "/",
    16: "0", 17: "1", 18: "2", 19: "3", 20: "4", 21: "5", 22: "6", 23: "7",
    24: "8", 25: "9", 26: ":", 27: ";", 28: "<", 29: "=", 30: ">", 31: "?",
    32: "@", 33: "A", 34: "B", 35: "C", 36: "D", 37: "E", 38: "F", 39: "G",
    40: "H", 41: "I", 42: "J", 43: "K", 44: "L", 45: "M", 46: "N", 47: "O",
    48: "P", 49: "Q", 50: "R", 51: "S", 52: "T", 53: "U", 54: "V", 55: "W",
    56: "X", 57: "Y", 58: "Z", 59: "[", 60: "\\", 61: "]", 62: "^", 63: "_",
    64: "`", 65: "a", 66: "b", 67: "c", 68: "d", 69: "e", 70: "f", 71: "g",
    72: "h", 73: "i", 74: "j", 75: "k", 76: "l", 77: "m", 78: "n", 79: "o",
    80: "p", 81: "q", 82: "r", 83: "s", 84: "t", 85: "u", 86: "v", 87: "w",
    88: "x", 89: "y", 90: "z", 91: "{", 92: "|", 93: "}", 94: "~", 95: "ð",
    96: "ñ", 97: "ò", 98: "ó", 99: "ô", 100: "õ", 101: "ö", 102: "÷", 103: "ø",
    104: "ù", 105: "ú", 106: "—"
  }
}

var startCodes = {
  "code128a": "Ë",
  "code128b": "Ì",
  "code128c": "Í"
}

var stopCodes = {
  "common": "Î",
  "uncommon": "Ó",
  "barcodesoft": "û"
}

var checksums = {
  "code128a": 103,
  "code128b": 104,
  "code128c": 105
}

var checksum = checksums[ specification ]

for ( var i = 0; i < barcode.length; i++ ) {
  var char = fromMap[ fontMapping ][ barcode.charAt( i ).toString() ]
  var result = char * ( i + 1 )
  checksum += result
}

var startCode = startCodes[ specification ]
var checkSymbol = toMap[ fontMapping ][ checksum % 103 ]
var stopCode = stopCodes[ fontMapping ]

event.value = startCode + barcode + checkSymbol + stopCode