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|
# your shell command goes here
#
# Hacking EAN numbers to a form usable with WLEAN.MF.
#
# September 3, 1997
# Peter Willadt
#
# Added hacking any text for coding with code 128
# 1998-01-24
#
# Added checksumming for code 93
# 1998-11-29
#
# 2003-05-24
# cleaned up the code in several places and
# corrected code 93 checksumming due to a hint by
# Jacek Ruzyczka <uv_centcom@yahoo.com>
#
# 2003-05-24
# removed an error introduced the same day
#
# This file is free to use without any further permissions.
# This file comes with no warranty of any kind.
#
# The TeX file to be filtered may contain any number of lines
# that have one of the following commands
# starting at the leftmost position.
#
# \ean{12 or 13 digit number}
# the number gets coded as EAN,
# if it is only 12 digits long, the checksum gets calculated
#
# \embed{number}
# the number is used as a base for embedding article numbers & c.
# \eean{number}
# a number to be embedded with an ean.
#
# \isbn{number}
# an isbn to make an embedded ean of.
#
# \cxxviii{any 7 bit ascii values}
# code as barcode 128 (see rules below!)
#
# \xciii{uppercase text or number}
# text to be coded as code 128
#
# example:
# You want the isbn 0-201-13448-9 to be embedded.
# so you say \isbn{0201134489},
# but you may also say \embed{9780000000000} and,
# somewhere later in the file, \eean{020113448}
# In this case you have to leave the last digit out,
# as isbn loose their check digit in favour of the
# ean check digit.
# anyway you do it, you get your command replaced by
# \EAN{13-digit-number-coded-strange}
# in the output file.
#
#
# code 128 rules:
# you write a line starting with \cxxviii{
# followed by arbitrary 7 bit characters, delimited by a right brace}.
# as perl is greedy, it will be the rightmost right brace (no fence matching),
# but as perl is also nice, you will be warned if there is another
# right brace. Please note that even the percent character % will be
# included. So it is better to write the \cxxviii{...} statement onto
# a line of its own. You may replace any character by ^^00 and
# similiar codes, preferably you will do this to non-printable ascii
# characters, or right braces and the like. This routine will try to find
# an efficent way to make code 128 (sorry, not necessarily the most
# efficient way) out of your input and then it will
# insert a line like \CXXVIII{3a 70 12 ... @@} in the output file.
# The code 128 special characters can be included by the following codes:
# ^^80 FNC3
# ^^81 FNC2
# ^^82 SHIFT
# ^^83 CODE C/CODE C/99
# ^^84 CODE B/FNC4/CODE B
# ^^85 FNC4/CODE A/CODE A
# ^^86 FNC1
# ^^87 START A
# ^^88 START B
# ^^89 START C
# ^^8a STOP
use strict;
use vars qw ( @ABTAB $ifname $ofname );
# code switch table for ean
@ABTAB=(0,0,0,0,0,0, #0
0,0,1,0,1,1, #1
0,0,1,1,0,1, #2
0,0,1,1,1,0, #3
0,1,0,0,1,1, #4 and so on
0,1,1,0,0,1,
0,1,1,1,0,0,
0,1,0,1,0,1,
0,1,0,1,1,0,
0,1,1,0,1,0,
);
# command line processing: Need input file
if($ARGV[0]){
$ifname=$ARGV[0];
}else{
print "Enter name of file to be processed: ";
$ifname = <>;
chomp($ifname);
}
# command line processing: need output file
if($ARGV[1]){
$ofname=">$ARGV[1]";
}else{
print "Enter name of output file: ";
$ofname = <>;
chomp($ofname);
$ofname = '>' . $ofname;
}
# make an ean
sub eancod{
my ($i, $j, $checksum, $disone);
my $srcstr=shift;
# first digits first
my $precod=substr($srcstr,0,1);
# Starting output string
my $eastring=$precod . " +";
# digits 2--7
for($i=0;$i<6;$i++){
my $disone=substr($srcstr,$i+1,1);
$disone =~ tr/0123456789/ABCDEFGHIJ/;
$disone= lc ($disone) if( @ABTAB[$precod*6 + $i]==1);
$eastring .=$disone;
}$eastring .= "-";
# digits 8--13
for($i=0;$i<6;$i++){
# if checksum misses, do your own
if(($i==5) && (length($srcstr)==12)){
for($j=0,$checksum=0;$j<12;$j++){
$checksum+=substr($srcstr,$j,1)*(1+($j&1)*2);
};
$checksum%=10;
$checksum=10-$checksum;
$checksum%=10;
$disone="$checksum";
}else {
$disone=substr($srcstr,$i+7,1);
}
$disone =~ tr/0123456789/KLMNOPQRST/;
$eastring .=$disone;
}$eastring .="+";
return $eastring;
}
##################################################
# here starts the code 128 stuff
#
##################################################
# get the numerical value of a hex character,
# e.g. 65 from 41
#
sub hexchar{
my $src=shift;
my ($i, $j, $result);
$src =~ tr/a-f/A-F/;
$i=ord(substr($src,0,1));
$j=ord(substr($src,1,1));
if($i >= ord("A")){
$i += (10-ord('A'));
}else{
$i -= ord("0");
}
if($j >= ord("A")){
$j += (10-ord("A"));
}else{
$j -= ord("0");
}
$result=16*($i)+$j;
return $result;
}
# globals:
# @cxxchars holds the characters the user wants to code
# @cxxlength is the size of this array
# @ctbl holds the possible codings for these chars
# @cxxout holds the codes to be output for code 128
# @cxxoutout holds the codes to be output for code 128
use vars qw ( @cxxchars $cxxlength @ctbl @cxxout @cxxoutout);
##################################################
# build up the switching table for code 128
sub makectbl{
# locals
my $i;
for($i=0;$i < $cxxlength; $i++){
if(($cxxchars[$i] >= ord("0"))&&($cxxchars[$i] <= ord("9"))){
# digits
$ctbl[$i]=7;
}elsif(($cxxchars[$i] >= ord(" "))&&($cxxchars[$i] <= ord("_"))){
# common Chars
$ctbl[$i]=3;
}elsif($cxxchars[$i] < ord(" ")){
# ascii control chars
$ctbl[$i]=1;
}elsif(($cxxchars[$i] >=ord("`"))&&($cxxchars[$i] <= ord("\x7f"))){
# lowercase
$ctbl[$i]=2;
if($cxxchars[$i] == ord("}")){
print "Encountered right brace in argument to cxxviii\n";
}
}else{ # Function Codes
$ctbl[$i] =7;
}
}
$ctbl[$i]=0; # makes a stop.
}
##################################################
# make a character array from a string
# looking like aBc\x41def^^41 or so.
#
sub unhex{
my ($i, $j, $b);
my $srcstr=shift;
$j=0;
for($i=0;($b=ord(substr($srcstr,$i,1))) > 0;$i++){
if($b == ord("\\")){
if(substr($srcstr,$i+1,1) =~ /[xX]/){ # hex input
$cxxchars[$j] = hexchar(substr($srcstr,$i+2,2));
$i += 3;
}else{
$cxxchars[$j] = ord("\\");
}
}elsif($b == ord("^")){
if(ord(substr($srcstr,$i+1,1)) == ord("^")){ # hex input
$cxxchars[$j] = hexchar(substr($srcstr,$i+2,2));
$i += 3;
}else{
$cxxchars[$j] = ord("^");
}
}else{
$cxxchars[$j] = $b;
}
$j++;
}
return $j;
}
##################################################
# write out a chunk of code 128 in hex symbols
#
sub cxxchunk{
my $j=shift;
my ($i, $sum, $k);
$sum=7;
for($i=0;$sum & $ctbl[$j+$i]; $i++){
$sum &= $ctbl[$j+$i];
}
if($sum==1){
$cxxout[$j]=101;
}else{
$cxxout[$j]=100;
}
for($k=0;$k<$i;$k++){
if(($sum==1)&&($cxxchars[$j+$k] < ord(" "))){
$cxxout[$j+$k+1]=$cxxchars[$j+$k] + 64;
}else{
$cxxout[$j+$k+1]=$cxxchars[$j+$k] - ord(" ");
}
}
$k++;
return $k;
}
##################################################
# consecutive digits may perhaps be efficiently
# coded with charset C
#
sub pastedigits{
my $digitcount=shift;
my $j=shift;
my $firstdigit=shift;
my $lastset=shift;
my $k;
if($digitcount==0){ # nothing to do
return $j;
}elsif($digitcount<4){
# digits here, but unfortunately not enough digits.
# so just copy them
for($k=0;$k<$digitcount;$k++){
$cxxoutout[$j] = $cxxout[$firstdigit+$k];
$j++;
}
return $j;
}else{
# is there an odd number of digits?
if(($digitcount & 1)==1){
$cxxoutout[$j] = $cxxout[$firstdigit];
$firstdigit++;
$digitcount--;
$j++;
}elsif(($cxxout[$j-1]>=99)&&($cxxout[$j-1]<=101)){
# Switched immediately before digits.
# so overwrite the switch
$j--;
}
$cxxoutout[$j] = 99; # switch to set C
$j++;
# copy digits in compressed format
for($k=0;$k<$digitcount;$k+=2){
$cxxoutout[$j] = ($cxxout[$firstdigit+$k]-16)*10
+$cxxout[$firstdigit+$k+1]-16;
$j++;
}
# reset char set, if you have to
if($lastset > 0){
$cxxoutout[$j] = $lastset;
$j++;
}
}
return $j;
}
sub digitoptimize{
# change to charset C if there are at least four numbers in a row.
# copy to @cxxoutout
my ($lastset, $firstdigit, $digitcount, $i,$j,$k);
$lastset =0;
$firstdigit=0;
$digitcount=0;
$j=0;
for($i = 0; $i < $cxxlength; $i++){
if(($cxxout[$i]>=16)&&($cxxout[$i]<=25)){
# it's a number
if($digitcount == 0){
$firstdigit=$i;
}
$digitcount++;
next;
}
if($digitcount >0){
$j=pastedigits($digitcount,$j,$firstdigit,$lastset);
$digitcount=0;
}
$cxxoutout[$j] = $cxxout[$i];
$j++;
if(($cxxout[$i]>=99)&&($cxxout[$i]<=101)){
# it's a code switch
$lastset=$cxxout[$i];
}else {
$lastset=0;
}
}
# $lastset is zero here, as there is no further need
# to switch the char set any more - we're at the end
$j=pastedigits($digitcount,$j,$firstdigit, 0);
return $j;
}
##################################################
# code 128 is a little complicated
# if you have read till here, you already know.
#
sub codcxxviii{
# locals
my ($i, $j, $sum);
my $srcstr=shift;
# first step: unhexing
$cxxlength = unhex($srcstr);
# @cxxchars now holds the characters the user wants
makectbl();
# @ctbl now contains the possible tables for the chars in $j;
for($i =0; $i < $cxxlength;){
$i += cxxchunk($i);
}
# change codeset switch to start
$cxxlength=$i;
$j=digitoptimize();
# Start symbols are different from switch symbols
if($cxxoutout[0]==99){
$cxxoutout[0]=105;
}elsif($cxxoutout[0]==100){
$cxxoutout[0]=104;
}else{
$cxxoutout[0]=103;
}
# calculate checksum and build output string
for($i=1,$sum=$cxxoutout[0];$i<$j;$i++){
$sum+=$cxxoutout[$i]*$i;
}
$sum %=103;
$cxxoutout[$j]=$sum;
$j++;
$cxxoutout[$j]=106; #stop sign
$srcstr="";
for($i=0;$i<($j+1);$i++){
$srcstr .= sprintf "%02X", $cxxoutout[$i];
}
$srcstr .= "@@";
return $srcstr;
}
##################################################
# do code 93 -- it's easy
##################################################
sub codxciii{
my $srcstr=shift;
my $cstbl='0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%()[]';
my ($i, $j, $sumc, $sumh, $checkchar);
$sumc=$sumh=0;
for ($i=0;$i<length($srcstr);$i++){
$j=index($cstbl, substr($srcstr,$i,1),0);
# $j is the check value of the character.
$sumh=$sumh+$j;
$sumc=$sumc+$sumh;
}
$srcstr=$srcstr . substr($cstbl,$sumc%47,1);
$sumc=$sumc+$sumh+($sumc%47);
$checkchar=substr($cstbl,$sumc%47,1);
$srcstr = $srcstr . $checkchar;
$srcstr =~ s/\$/\\\$/g;
$srcstr =~ s/%/\\%/g;
$srcstr =~ s/ /\\char\'040/g;
return $srcstr;
}
##################################################
# we got both input and output file,
# we defined all subroutines,
# so here we go...
#
use vars qw ( $line $embedded $embtmp $mycod $eastring);
open(EINGABE, $ifname) or die "No file";
open(AUSGABE, $ofname) or die "Can't open output file";
while($line=<EINGABE>){
# save 0.0005 (est.) % running time
unless ($line =~ /^\\/){
print AUSGABE $line;
next;
}
if($line =~ /^\\embed{(\d+)\}/){
$embedded=$1;
print AUSGABE $line;
}elsif($line =~ /^\\eean\{(\d+)\}(.*)/){
# embedded EAN
$embtmp=substr($embedded,0,12-length($1));
$mycod=$embtmp . $1;
$eastring=eancod($mycod);
print AUSGABE "\\EAN{$eastring}$2 % embedded($1)\n";
}elsif ($line =~ /^\\ean\{(\d+)\}(.*)/){
# normal ean
$eastring=eancod($1);
print AUSGABE "\\EAN{$eastring}$2 %($1)\n";
}elsif($line =~ /^\\isbn\{([\dxX]+)\}(.*)/){
# isbn to be embedded
$embtmp=substr($1,0,9);
$mycod='978' . $embtmp;
$eastring=eancod($mycod);
print AUSGABE "\\EAN{$eastring}$2 % ISBN($1)\n";
}elsif($line =~ /^\\cxxviii\{(.+)\}(.*)/){
# code 128
$eastring=codcxxviii($1);
print AUSGABE "\\CXXVIII $eastring $2 % Code128($1)\n";
}elsif($line =~ /^\\xciii\{(.+)\}(.*)/){
# code 93
$eastring=codxciii($1);
print AUSGABE "\\XCIII{$eastring}$2 % Code93($1)\n";
}else {
print AUSGABE $line;
}
}
##################################################
# we're done, so we do some cleanup and quit.
close (EINGABE);
close (AUSGABE);
print "Done.\n";
##################################################
# what we do here is called
# 'falling off the edge of the world'
# in the camel book.
##################################################
|