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jonen |
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/* |
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* Built-In Encoders |
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* Part of PHP-Barcode 0.3pl1 |
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* (C) 2001,2002,2003,2004 by Folke Ashberg <folke@ashberg.de> |
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* The newest version can be found at http://www.ashberg.de/bar |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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function barcode_gen_ean_sum($ean){ |
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$even=true; $esum=0; $osum=0; |
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for ($i=strlen($ean)-1;$i>=0;$i--){ |
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if ($even) $esum+=$ean[$i]; else $osum+=$ean[$i]; |
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$even=!$even; |
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} |
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return (10-((3*$esum+$osum)%10))%10; |
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} |
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/* barcode_encode_ean(code [, encoding]) |
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* encodes $ean with EAN-13 using builtin functions |
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* |
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* return: |
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* array[encoding] : the encoding which has been used (EAN-13) |
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* array[bars] : the bars |
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* array[text] : text-positioning info |
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*/ |
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function barcode_encode_ean($ean, $encoding = "EAN-13"){ |
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$digits=array(3211,2221,2122,1411,1132,1231,1114,1312,1213,3112); |
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$mirror=array("000000","001011","001101","001110","010011","011001","011100","010101","010110","011010"); |
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$guards=array("9a1a","1a1a1","a1a"); |
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$ean=trim($ean); |
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if (eregi("[^0-9]",$ean)){ |
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return array("text"=>"Invalid EAN-Code"); |
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} |
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$encoding=strtoupper($encoding); |
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if ($encoding=="ISBN"){ |
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if (!ereg("^978", $ean)) $ean="978".$ean; |
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} |
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if (ereg("^978", $ean)) $encoding="ISBN"; |
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if (strlen($ean)<12 || strlen($ean)>13){ |
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return array("text"=>"Invalid $encoding Code (must have 12/13 numbers)"); |
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} |
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$ean=substr($ean,0,12); |
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$eansum=barcode_gen_ean_sum($ean); |
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$ean.=$eansum; |
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$line=$guards[0]; |
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for ($i=1;$i<13;$i++){ |
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$str=$digits[$ean[$i]]; |
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if ($i<7 && $mirror[$ean[0]][$i-1]==1) $line.=strrev($str); else $line.=$str; |
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if ($i==6) $line.=$guards[1]; |
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} |
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$line.=$guards[2]; |
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/* create text */ |
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$pos=0; |
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$text=""; |
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for ($a=0;$a<13;$a++){ |
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if ($a>0) $text.=" "; |
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$text.="$pos:12:{$ean[$a]}"; |
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if ($a==0) $pos+=12; |
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else if ($a==6) $pos+=12; |
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else $pos+=7; |
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} |
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return array( |
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"encoding" => $encoding, |
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"bars" => $line, |
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"text" => $text |
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); |
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} |
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?> |
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