function tex_filter_get_cmd($pathname, $texexp)
{
$texexp = tex_sanitize_formula($texexp);
$texexp = escapeshellarg($texexp);
$executable = tex_filter_get_executable(false);
if (PHP_OS == "WINNT" || PHP_OS == "WIN32" || PHP_OS == "Windows") {
$executable = str_replace(' ', '^ ', $executable);
return "{$executable} ++ -e \"{$pathname}\" -- {$texexp}";
} else {
return "\"{$executable}\" -e \"{$pathname}\" -- {$texexp}";
}
}
/**
* Turn the bit of TeX into a valid latex document
* @param string $forumula the TeX formula
* @param int $fontsize the font size
* @return string the latex document
*/
function construct_latex_document($formula, $fontsize = 12)
{
global $CFG;
$formula = tex_sanitize_formula($formula);
// $fontsize don't affects to formula's size. $density can change size
$doc = "\\documentclass[{$fontsize}pt]{article}\n";
$doc .= $CFG->filter_tex_latexpreamble;
$doc .= "\\pagestyle{empty}\n";
$doc .= "\\begin{document}\n";
//dlnsk $doc .= "$ {$formula} $\n";
if (preg_match("/^[[:space:]]*\\\\begin\\{(gather|align|alignat|multline).?\\}/i", $formula)) {
$doc .= "{$formula}\n";
} else {
$doc .= "\$ {$formula} \$\n";
}
$doc .= "\\end{document}\n";
return $doc;
}
}
$CFG->texfilterdir = "filter/tex";
$CFG->teximagedir = "filter/tex";
error_reporting(E_ALL);
$texexp = urldecode($_SERVER['QUERY_STRING']);
$texexp = str_replace('formdata=', '', $texexp);
if ($texexp) {
//$texexp = stripslashes($texexp);
$lifetime = 86400;
$image = md5($texexp) . ".gif";
$filetype = 'image/gif';
if (!file_exists("{$CFG->dataroot}/{$CFG->teximagedir}")) {
make_upload_directory($CFG->teximagedir);
}
$pathname = "{$CFG->dataroot}/{$CFG->teximagedir}/{$image}";
$texexp = tex_sanitize_formula($texexp);
$texexp = escapeshellarg($texexp);
switch (PHP_OS) {
case "Linux":
system("{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex.linux -e {$pathname} -- {$texexp}");
break;
case "WINNT":
case "WIN32":
case "Windows":
system("{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex.exe -e {$pathname} -- {$texexp}");
break;
case "Darwin":
system("{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex.darwin -e {$pathname} -- {$texexp}");
break;
}
if (file_exists($pathname)) {
function tex2image($texexp, $return = false)
{
global $CFG;
$error_message1 = "Your system is not configured to run mimeTeX. ";
$error_message1 .= "You need to download the appropriate<br /> executable ";
$error_message1 .= "from <a href=\"http://moodle.org/download/mimetex/\">";
$error_message1 .= "http://moodle.org/download/mimetex/</a>, or obtain the ";
$error_message1 .= "C source<br /> from <a href=\"http://www.forkosh.com/mimetex.zip\">";
$error_message1 .= "http://www.forkosh.com/mimetex.zip</a>, compile it and ";
$error_message1 .= "put the executable into your<br /> moodle/filter/tex/ directory. ";
$error_message1 .= "You also need to edit your moodle/filter/tex/pix.php file<br />";
$error_message1 .= ' by adding the line<br /><pre> case "' . PHP_OS . "\":\n";
$error_message1 .= " \$cmd = \"\\\\\"\$CFG->dirroot/\$CFG->texfilterdir/";
$error_message1 .= 'mimetex.' . strtolower(PHP_OS) . "\\\\\" -e \\\\\"\$pathname\\\\\" \". escapeshellarg(\$texexp);";
$error_message1 .= "</pre>You also need to add this to your texdebug.php file.";
if ($texexp) {
$texexp = '\\Large ' . $texexp;
$lifetime = 86400;
$image = md5($texexp) . ".gif";
$filetype = 'image/gif';
if (!file_exists("{$CFG->dataroot}/{$CFG->teximagedir}")) {
make_upload_directory($CFG->teximagedir);
}
$pathname = "{$CFG->dataroot}/{$CFG->teximagedir}/{$image}";
if (file_exists($pathname)) {
unlink($pathname);
}
$commandpath = "";
$cmd = "";
$texexp = tex_sanitize_formula($texexp);
$texexp = escapeshellarg($texexp);
switch (PHP_OS) {
case "Linux":
$commandpath = "{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex.linux";
$cmd = "\"{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex.linux\" -e \"{$pathname}\" {$texexp}";
break;
case "WINNT":
case "WIN32":
case "Windows":
$commandpath = "{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex.exe";
$cmd = str_replace(' ', '^ ', $commandpath);
$cmd .= " ++ -e \"{$pathname}\" {$texexp}";
break;
case "Darwin":
$commandpath = "{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex.darwin";
$cmd = "\"{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex.darwin\" -e \"{$pathname}\" {$texexp}";
break;
}
if (!$cmd) {
if (is_executable("{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex")) {
/// Use the custom binary
$commandpath = "{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex";
$cmd = "{$CFG->dirroot}/{$CFG->texfilterdir}/mimetex -e {$pathname} {$texexp}";
} else {
error($error_message1);
}
}
system($cmd, $status);
}
if ($return) {
return $image;
}
if ($texexp && file_exists($pathname)) {
$lastmodified = filemtime($pathname);
header("Last-Modified: " . gmdate("D, d M Y H:i:s", $lastmodified) . " GMT");
header("Expires: " . gmdate("D, d M Y H:i:s", time() + $lifetime) . " GMT");
header("Cache-control: max_age = {$lifetime}");
// a day
header("Pragma: ");
header("Content-disposition: inline; filename={$image}");
header("Content-length: " . filesize($pathname));
header("Content-type: {$filetype}");
readfile("{$pathname}");
} else {
$ecmd = "{$cmd} 2>&1";
echo `{$ecmd}` . "<br />\n";
echo "The shell command<br />{$cmd}<br />returned status = {$status}<br />\n";
if ($status == 4) {
echo "Status corresponds to illegal instruction<br />\n";
} else {
if ($status == 11) {
echo "Status corresponds to bus error<br />\n";
} else {
if ($status == 22) {
echo "Status corresponds to abnormal termination<br />\n";
}
}
}
if (file_exists($commandpath)) {
echo "File size of mimetex executable {$commandpath} is " . filesize($commandpath) . "<br />";
echo "The file permissions are: " . decoct(fileperms($commandpath)) . "<br />";
if (function_exists("md5_file")) {
echo "The md5 checksum of the file is " . md5_file($commandpath) . "<br />";
} else {
$handle = fopen($commandpath, "rb");
$contents = fread($handle, 16384);
fclose($handle);
echo "The md5 checksum of the first 16384 bytes is " . md5($contents) . "<br />";
}
} else {
echo "mimetex executable {$commandpath} not found!<br />";
}
echo "Image not found!";
}
}
