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Iteratively increase backtrack limit to try to handle preg_replace limitations on larger files

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Nathan Gray 2011-04-06 20:45:14 +00:00
parent 0bfd238e3f
commit 1d41d567a0
1 changed files with 18 additions and 3 deletions
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21
etemplate/inc/class.bo_merge.inc.php
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@ -483,6 +483,7 @@ abstract class bo_merge
$err = lang('%1 not implemented for %2!','$$pagerepeat$$',$mimetype);
return false;
}
return $content;
}
@ -571,8 +572,8 @@ abstract class bo_merge
switch($mimetype.$mso_application_progid)
{
case 'application/vnd.oasis.opendocument.spreadsheet': // open office calc
$format = '/<table:table-cell([^>]+?)office:value-type="([^"]+)"([^>]*?)>.?<([a-z].*?)[^>]*>('.implode('|',$names).')<\/\4>.?<\/table:table-cell>/s';
$replacement = '<table:table-cell$1office:value-type="float" office:value="$5"$3>$5</table:table-cell>';
$format = '/<table:table-cell([^>]+?)office:value-type="[^"]+"([^>]*?)>.?<([a-z].*?)[^>]*>('.implode('|',$names).')<\/\3>.?<\/table:table-cell>/s';
$replacement = '<table:table-cell$1office:value-type="float" office:value="$4"$2>$4</table:table-cell>';
break;
case 'application/xmlExcel.Sheet': // Excel 2003
$format = '/'.preg_quote('<Data ss:Type="String">','/').'('.implode('|',$names).')'.preg_quote('</Data>','/').'/';
@ -582,7 +583,21 @@ abstract class bo_merge
}
if($format && $names)
{
$content = preg_replace($format, $replacement, $content);
// Dealing with backtrack limit per AmigoJack 10-Jul-2010 comment on php.net preg-replace docs
$increase = 0;
while($increase < 10) {
$result = preg_replace($format, $replacement, $content, -1, $count);
if( preg_last_error()== PREG_BACKTRACK_LIMIT_ERROR ) { // Only check on backtrack limit failure
ini_set( 'pcre.backtrack_limit', (int)ini_get( 'pcre.backtrack_limit' )+ 100000 ); // Get current limit and increase
$increase++; // Do not overkill the server
} else { // No fail
$content = $result; // On failure $sNewText would be NULL
break; // Exit loop
}
}
if($increase == 10) {
throw new egw_exception('Backtrack limit exceeded @ ' . ini_get('pcre.backtrack_limit'));
}
}
}
// replace CRLF with linebreak tag of given type