Barcode::DataMatrix::Engine(3p)

NAME
Barcode::DataMatrix::Engine - The engine which generates the data matrix bitmap.

  DEBUG
Turn on/off general debugging information.

  E_ASCII
Represent the ASCII encoding type.

  E_C40
Represent the C40 encoding type. (upper case alphanumeric)

  E_TEXT
Represent the TEXT encoding type. (lower case alphanumeric)

  E_BASE256
Represent the BASE256 encoding type.

  E_NONE
Represent the when there is no encoding type.

  E_AUTO
Represent the when the encoding type is automatically set.

  Types
Return a list of encoding types.

  stringToType (type_name)
Return the integer representing the type from the type name.

  typeToString (type_integer)
Return the type name from the integer representing the type.

  stringToFormat (format_string)
Convert a "width x height" format string into an internal format specification.

  setType (type_name)
Set the encoding type from the given type name.

  new
Construct a "Barcode::DataMatrix::Engine" object.

  init
Initialize some of the basic "Barcode::DataMatrix::Engine" data.

  ProcessTilde
Handle special or control characters, which are prefixed by a tilde "~" when encoding.

  CalcReed (ai, err)
Return the message as a Reed-Solomon encoded array.

  A253 (i, j)
Return padding codewords via the 253-state algorithm.

For more information see <http://grandzebu.net/informatique/codbar-en/datamatrix.htm>.

The relevant text for this algorithm is reproduced here.

If the symbol is not full, pad "CW"s are required. After the last data "CW", the 254 "CW" indicates the end of the datas or the return to ASCII method. First padding "CW" is 129 and next padding "CW"s are computed with the 253-state algorithm.

The 253-state algorithm

Let "P" be the number of data "CW"s from the beginning of the data, "R" a pseudo random number and "CW" the required pad "CW".

    R = ((149 * P) MOD 253) + 1
    CW = (129 + R) MOD 254

  CreateBitmap
Generate and return the bitmap representing the message.

  ecc (format, ai)
Return the ECC200 (DataMatrix) array, formatted for the appropriate matrix size.

  isIDigit (character_code)
Return true if the character code represents a digit.

  isILower (character_code)
Return true if the character code represents a lower case letter.

  isIUpper (character_code)
Return true if the character code represents an upper case letter.

  DetectEncoding
Detect the encoding type.

  EncodeASCII (i, ai, ai1, as)
Encode the message as ASCII.

  SelectEncoding (j, ai, i)
Select a new encoding type for the message.

  EncodeC40TEXT (i, ai, ai1, ai2, flag, flag1, flag2)
Encode the message as C40/TEXT.

  state255 (V, P)
The 255-state algorithm. Used when encoding strings with the BASE256 type.

This information originally from <http://grandzebu.net/informatique/codbar-en/datamatrix.htm>.

Let "P" the number of data "CW"s from the beginning of datas ("CW" = code word). Let "R" be a pseudo random number, "V" the base 256 "CW" value and "CW" the required "CW".

    R = ((149 * P) MOD 255) + 1
    CW = (V + R) MOD 256

  hexary (src)
Return a string representation of the input hexadecimal number.

  EncodeBASE256 (i, hint, src, stat, res, flag)
Encode the message as BASE256.

  GenData (ai)
Generate and return the data for the DataMatrix bitmap from the input array.

  FillBorder (ai, i, j, k, l)
Fill the border of the ECC200 data matrix bitmap.

  FillCharData (ncol, nrow, array)
Fill the data matrix with the character data in the given message array.