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+% Macro for conversion of string to barcodes by Code 128 standard
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% March 1996                                 (C) Petr Ol\v{s}\'ak
+
+% For user information see the file test128.tex
+
+% Comments at programmer level are included in this file. First you can
+% read the end of this file: The description of Code 128 standard.
+
+\wlog{**** Macro for barcodes in "Code 128" by (C) Petr Olsak used ****}
+
+% Declarations:
+\newdimen\X            % the module size X,
+\newdimen\bcorr        % the bar correction (see bellow).
+\newdimen\workdimen \newdimen\barheight   % internal variables
+\newtoks\inputtext \newtoks\icode
+\newcount\tempnum \newcount\chnum \newcount\chtotal
+\newif\ifnext \newif\ifchar
+\def\empty{} \def\End{@@end}
+
+% Implicit values:
+\X=.33mm         % The X module width.
+\bcorr=.020mm    % Bar reduction.
+\barheight=1.5cm % The code height.
+
+% First we declare some tables.
+% "\definetable<lab><num> string \relax": Each token from "string" gets a value
+% (spaces are ignored). First token gets value <num>, second <num+1>
+% and so on. It is possible to reconstruct the value by
+% "\csname<lab>\string<token>\endcsname".
+\def\definetable#1#2 {\tempnum=#2 \def\temp{#1}\let\next=\repeatdefine \next}
+\def\repeatdefine#1{\ifx#1\relax \let\next=\relax \else
+  \expandafter\edef\csname\temp\string#1\endcsname{\the\tempnum}%
+  \advance\tempnum by1 \fi \next}
+
+%%%%%%%%%%%%%%%%%%%%% Basic tables for Code 128: %%%%%%%%%%%%%%%%%%%%%%%%%%%
+\definetable:0  % All input characters from Code B:
+  \  ! " \# \$ \% \& ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @
+  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \\ ] \^ \_ `
+  a b c d e f g h i j k l m n o p q r s t u v w x y z \{ | \} \~ \DEL \relax
+\definetable:64 % Other input characters from Code A:
+  \NUL \SOH \STX \ETX \EOT \ENQ \ACK \BEL \BS \HT \LF \VT \FF \CR \SO \SI
+  \DLE \DCone \DCtwo \DCthree \DCfour \NAK \SYN \ETB \CAN \EM \SUB \ESC
+  \FS \GS \RS \US \relax
+\definetable:0 \
+  \relax    % the \^^M must be the same as \<space>
+\definetable:0 \SP \relax  % the \SP is alternative to \<space>
+\definetable{D:}0 0123456789 \relax  % Digits
+\definetable{B:}0 `abcdefghijklmnopqrstuvwxyz\{\|\}\~ \relax % Only in Code B
+\definetable{A:}0  \NUL \SOH \STX \ETX \EOT \ENQ \ACK \BEL \BS \HT \LF \VT
+  \FF \CR \SO \SI \DLE \DCone \DCtwo \DCthree \DCfour \NAK \SYN \ETB \CAN
+  \EM \SUB \ESC \FS \GS \RS \US \relax % only in code A.
+\def\tableofcode#1{\ifcase#1 % The output characters:
+  212222\or 222122\or 222221\or 121223\or 121322\or % 0-4
+  131222\or 122213\or 122312\or 132212\or 221213\or % 5-9
+  221312\or 231212\or 112232\or 122132\or 122231\or % 10-14
+  113222\or 123122\or 123221\or 223211\or 221132\or % 15-19
+  221231\or 213212\or 223112\or 312131\or 311222\or % 20-24
+  321122\or 321221\or 312212\or 322112\or 322211\or % 25-29
+  212123\or 212321\or 232121\or 111323\or 131123\or % 30-34
+  131321\or 112313\or 132113\or 132311\or 211313\or % 35-39
+  231113\or 231311\or 112133\or 112331\or 132131\or % 40-44
+  113123\or 113321\or 133121\or 313121\or 211331\or % 45-49
+  231131\or 213113\or 213311\or 213131\or 311123\or % 50-54
+  311321\or 331121\or 312113\or 312311\or 332111\or % 55-59
+  314111\or 221411\or 431111\or 111224\or 111422\or % 60-64
+  121124\or 121421\or 141122\or 141221\or 112214\or % 65-69
+  112412\or 122114\or 122411\or 142112\or 142211\or % 70-74
+  241211\or 221114\or 413111\or 241112\or 134111\or % 75-79
+  111242\or 121142\or 121241\or 114212\or 124112\or % 80-84
+  124211\or 411212\or 421112\or 421211\or 212141\or % 85-89
+  214121\or 412121\or 111143\or 111341\or 131141\or % 90-94
+  114113\or 113311\or 411113\or 411311\or 113141\or % 95-99
+  114131\or 311141\or 411131\else 00000\fi }        % 100-102
+\def\startA{211412}
+\def\startB{211214}
+\def\startC{211232}
+\def\stop{23311120}
+
+% Implementations of tests:
+% After "\testchar <lab><token>" the "\ifchar" has following meaning:
+% true, if <token> is in digits, only in A or only in B respectively with
+% <lab> is {D:}, {A:} or {B:}.
+\def\testchar #1#2{\expandafter\ifx\csname#1\string#2\endcsname \relax
+          \charfalse \else \chartrue \fi}
+
+% After "\numofdigits string\stop" is used, the \tempnum register contain
+% the number of digits from first continuosly group of digits from left in
+% "string". If "string" starts with no digit then \tempnum=0.
+\def\numofdigits{\tempnum=0 \let\next=\cyklnumber \cyklnumber}
+\def\cyklnumber#1{\testchar {D:}#1%
+   \ifchar \advance\tempnum by1
+   \else \ifx #1\stop\def\next{}%
+         \else \def\next##1\stop{}\fi
+   \fi \next}
+
+% After "\testnext<lab> string\stop" is used, the "\ifnext" has
+% the following meaning:
+% 1. <lab> is {A:}: "\ifnext" is true, if first character from "string" is
+% only in A code after skip all common characters shared in codeA and B.
+% 2. <lab> is {B:}: "\ifnext" is true, if first character from "string" is
+% only in B code after skip all common characters shared in codeA and B.
+\def\testA{A:}
+\def\testnext#1{\nextfalse
+  \def\tempA{#1}%
+  \ifx\tempA\testA \def\tempB{B:}\else \def\tempB{A:}\fi
+  \let\next=\cyklcontrol \next}
+\def\cyklcontrol#1{%
+   \ifx#1\stop \let\next=\relax
+   \else \testchar \tempB #1%
+         \ifchar \def\next##1\stop{}%
+         \else \testchar \tempA #1%
+               \ifchar \nexttrue \def\next##1\stop{}\fi \fi
+   \fi \next}
+
+% "\addtok \cs" adds the "\cs," into \icode.
+% "\addtoks{string} adds the "string," into \icode. "string" is the number
+% of line in table 1, so we re-calculate the current check sum.
+% "\addchar <token> adds the numerical value of <token> (declared in
+% \definetable:) into \icode. This value is followed by comma too.
+\def\addtok#1{\edef\act{\noexpand\icode={\the\icode\noexpand#1,}}\act}
+\def\addtoks#1{\edef\act{\noexpand\icode={\the\icode#1,}}\act
+  \tempnum=#1 \multiply\tempnum by\chnum
+  \advance\chtotal by\tempnum \advance\chnum by 1\relax}
+\def\addchar#1{\expandafter\ifx\csname:\string#1\endcsname\relax
+  \errmessage{The input token "\string#1" is not included in Code 128
+              table, will ignored}%
+  \else \expandafter\addtoks\expandafter{\csname:\string#1\endcsname}\fi}
+
+% \code{text} first converts the input text into internal representation in
+% \icode. The format of \icode is: "\start,num,num,num,\stop,", where
+% "\start" is one of "\startA" or "\startB" or "\startC". The <num>
+% represents the line of code table (see standard of Code 128 bellow)
+% of output characters. The amount of <num>s is not restricted. The sequence
+% is terminated by "\stop,". See to .log for example of this format.
+%
+% The choice of the start character:
+% If next 4 input characters are digits then \startC
+% else if the next uncommon char is from code A and not from B then \startA
+%      else \startB
+% The "next uncommon char" is first character from left which falls
+% into code A xor code B
+\def\code#1{\inputtext={#1}\wlog{** Code 128 ** input: \the\inputtext}%
+  \icode={}\chnum=1
+  \numofdigits#1\stop % in \tempnum is the number of digits now
+  \ifnum\tempnum>3 \addtok\startC \chtotal=2 \let\Next=\codeC \else
+     \testnext{A:} #1\stop
+     \ifnext \addtok\startA \chtotal=0 \let\Next=\codeA
+     \else \addtok\startB \chtotal=1 \let\Next=\codeB \fi
+  \fi \Next #1\End\End}
+
+% There is mode A. Test to change the mode:
+% If the next 4 input characters are digits and the number of digits are even
+%    then switch to modeC using <codeC>.
+% If the next char is from Code B and not from Code A then:
+%    if the next uncommnon char is from Code B and not from A then
+%         switch to mode B using <codeB>.
+%    else include <SHIFT> and stay in mode A.
+\def\codeA #1#2#3\End{\addchar#1%
+  \numofdigits#2#3\stop
+  \ifnum\tempnum>3 \ifodd\tempnum\else
+      \addtoks{99}\let\Next=\codeC \fi
+  \else \ifx#2\End \let\Next=\finalcode
+        \else \testchar{B:} #2%
+              \ifchar \testnext{B:} #3\stop
+                      \ifnext \addtoks{100}\let\Next=\codeB
+                      \else \addtoks{98}\fi \fi \fi \fi
+  \Next #2#3\End}
+
+% There is mode B. Test to change the mode:
+% If the next 4 input characters are digits and the number of digits are even
+%    then switch to modeC using <codeC>
+% If the next char is from Code A and not from Code B then:
+%    if the next uncommnon char is from Code A and not from B then
+%         switch to mode A using <codeA>.
+%    else include <SHIFT> and stay in mode B.
+\def\codeB #1#2#3\End{\addchar#1%
+  \numofdigits#2#3\stop
+  \ifnum\tempnum>3 \ifodd\tempnum\else
+      \addtoks{99}\let\Next=\codeC \fi
+  \else \ifx#2\End \let\Next=\finalcode
+        \else \testchar{A:} #2%
+              \ifchar \testnext{A:} #3\stop
+                      \ifnext \addtoks{101}\let\Next=\codeA
+                      \else \addtoks{98}\fi \fi \fi \fi
+  \Next #2#3\End}
+
+% There is mode C. Test to change the mode:
+% If not next two chars are digits switch to code A or B by following rule:
+% If the next uncommon char is from Code A and not from B then
+%      switch to mode A using <codeA>
+% else switch to mode B using <codeB>
+\def\codeC #1#2#3#4\End{\addtoks{#1#2}%
+  \ifx#3\End \let\Next=\finalcode
+  \else \testchar{D:} #3%
+        \ifchar \def\temp{#4}%
+                \ifx\temp\empty \switchtoAorB #3\stop
+                \else \separate #4\stop
+                      \edef\act{\noexpand\testchar{D:}\temp}\act
+                      \ifchar
+                      \else \switchtoAorB #3#4\stop \fi \fi
+        \else \switchtoAorB #3#4\stop \fi
+  \fi \Next #3#4\End}
+\def\separate#1#2\stop{\def\temp{#1}}
+\def\switchtoAorB #1\stop{\testnext{A:} #1\stop
+   \ifnext \addtoks{101}\let\Next=\codeA
+   \else \addtoks{100}\let\Next=\codeB \fi}
+
+\def\finalcode\End\End{\addchecksum \addtok\stop \wlog{encoded: \the\icode}%
+  \expandafter\makecode\the\icode}
+
+% \addchecksum adds the check sum into \icode
+\def\addchecksum{\tempnum=\chtotal
+  \divide\tempnum by 103 \multiply\tempnum by 103
+  \advance\chtotal by-\tempnum \addtoks{\the\chtotal}}
+
+% The \makecode converts the \icode from format "\start,num,num,\stop,"
+% into sequence of digits. Each digit repersents the multiple of X module
+% size for bar or space if it is at odd or even position. For example
+% 21141223311120. It means bar of 2X, space 1X, bar 1X, space 4X and so on.
+% This representation of code is stored in macro \internalcode.
+\def\makecode#1,{\let\next=\cyklcode \edef\internalcode{#1}\next}
+\def\cyklcode#1,{%
+  \ifx\stop#1\let\next=\finalmakecode \edef\internalcode{\internalcode\stop}%
+  \else \edef\internalcode{\internalcode\tableofcode{#1}}\fi \next}
+\def\finalmakecode{\wlog{black-white: \internalcode}%
+  \begcode \let\next=\makebars \expandafter\makebars\internalcode}
+
+% \makebars simply makes the \vrules and \kerns of appropriate sizes from
+% \internalcode representation. Each width of \vrule is corrected by \bcorr
+% and opposite for \kern.
+\def\makebars#1#2{\if0#2\let\next=\endcode\fi
+  \workdimen=#1\X \advance\workdimen by-\bcorr \vrule width\workdimen
+  \workdimen=#2\X \advance\workdimen by \bcorr \kern\workdimen
+  \next}
+
+% The begin and end of completed \hbox:
+\def\begcode{\hbox\bgroup\vrule height\barheight width0pt}
+\def\endcode{\egroup}
+
+% User can use \codetext or \codeothertext instead \code:
+\def\codeothertext#1#2{\vbox{\halign{\hfil##\hfil\cr\code{#1}\cr{\tt#2}\cr}}}
+\def\codetext#1{\codeothertext{#1}{#1}}
+
+\endinput %%%%%%%%%%%%%%% End of macros %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+               The description of Code 128 standard
+               ************************************
+
+The characters from input string are converted from left to right
+to so called "output characters" by table 1 (see below). Each output
+character has three bars and spaces. The width of bars and the dimensions
+of spaces between bars are significant. This values are expresed by
+multiples of basic dimension: so called X module size (see \X in macro).
+The multiples varies from 1 to 4. We are using the six digits expression of
+output character. It expressed dimensions of bar, space, bar, space, bar,
+space. For example 122412 means one output character drawn as: 1X bar, 2X
+space, 2X bar, 4X space, 1X bar and 2X space.
+
+The table 1:
+
+num.line  code A    code B    codeC     output character
+-------------------------------------------------------
+  0       [space]    [space]    00        212222
+  1            !         !      01        222122
+  2            "         "      02        222221
+  3            #         #      03        121223
+... and so on ...
+ 63            _         _      63        111224
+ 64         \NUL         `      64        111422
+ 65         \SOH         a      65        121124
+ 66         \STX         b      66        121421
+... and so on ...
+ 93          \GS         }      93        111341
+ 94          \RS         ~      94        131141
+ 95          \US      \DEL      95        114113
+ 96       <FNC3>    <FNC3>      96        113311
+ 97       <FNC2>    <FNC2>      97        411113
+ 98      <SHIFT>   <SHIFT>      98        411311
+ 99      <codeC>   <codeC>      99        113141
+100      <codeB>    <FNC4>   <codeB>      114131
+101       <FNC4>   <codeA>   <codeA>      311141
+102       <FNC1>    <FNC1>    <FNC1>      411131
+
+The whole table is not presented here because you can simply reconstruct it
+from macros.
+
+The columns "code A", "code B", and "code C" inlude all possible input
+characters in input string (excluding "special commands" in lines 96--102
+written in <angle> braces). The special \TeX{} characters must be escaped
+(i.e. user have to write \# and no #). The escaped words (in capitals)
+represents so called "control characters" from ASCII. The meaning of this
+sequences depends on application. The "special commands" in lines 96--102
+written in <angle> braces are not possible in input. They are special for
+decoder. The <SHIFT> and <codeA-C> are used in our macro, but <FNC?> are
+not because they are reserved for special purposes.
+
+The Code B column is whole expressed in \definetable:0 (see in macro). The
+Code A column has the same values in lines 0--63 (capitals, digits and some
+other ASCII characters are included here). Code A differ from Code B in
+lines 64--102. The lowercase letters and another ASCII characters are
+included in "Code B", but control sequences are included in "Code A".
+The different part of "Code A" column is expressed in \definetable:64 (see
+in macro). The "code C" column includes the digits pairs and corresponds to
+number of line in table 1. Two digits in input go to one output character.
+The whole "output character" column is expressed in \tableofcode (see in
+macro).
+
+The "start character" is appended before each barcode. There are three
+types of start character depending on which column of table is used for
+next encoding (so called mode). See macros \startA, \startB and \startC.
+For examlpe: If \startC is used, next output character represents two
+digits in input (codeC mode). If \startB is used, next output character
+represents one ASCII character in input (codeB mode). If \startA is used,
+next output character represents probably the control sequence in input or
+capitals, but not lowercase ASCII (codeA mode).
+
+If some mode for encoding is currently used and next input character is not
+included in appropriate column, the "switching command" is included into
+sequence of output character. The <SHIFT> command switches from mode A to
+B or from B to A only for one next input character and the other input
+characters are coded in the same mode (A or B). The <codeA> command
+switches to codeA mode definitively unless next switch command is used.
+The commands <codeB> and <codeC> makes the same service, but to switch into
+mode B or C respectively. All these commands are expessed in table 1.
+
+It is recomended to chose the start character and switching commands by the
+way, that the resulting length of code is minimised. There are some
+recommendations of this choice. These recommendations are included into our
+macros (see the commnets and macros for \code, \codeA, \codeB and \codeC).
+
+The checksum character is added after the end of input string. Finally,
+the "stop character" is appended after the end of barcode. This character
+has exclusively four bars and not only three. See macro \stop.
+
+The checksum character is calculated from output characters used in the
+code. The number of line in table 1 of each output character is asumed. The
+start character is covered too, but checksum character itself and the
+stop character are not included into calculation. The startA or startB or
+startC characters has its number of line 103 or 104 or 105 respectively. Each
+output character (more exactly its number of line in table 1) is multiplied
+by "weight number" and the total sum is calculated. The weight number of
+start character is one. The weight number of first output characet after
+start is one too. Second character has weight number two, and so on. The
+n-th character has weight number n. The total sum modulo 103 is the line of
+the calculated checksum character.
+
+Example for checksum calculation:
+Input:    123456
+Encoded:  StartC, 12, 34, 56
+Total sum of checksum: 105 + 1*12 + 2*34 + 3*56 = 535
+Modulo 103: 44
+The character from line 44 is apended as checksum.
+The whole encoded code: StartC, 12, 34, 56, 44, Stop
+
+%%% End of file.
+
+
+
+