function tex2image($texexp, $md5, $return = false)
{
global $CFG;
if (!$texexp) {
echo 'No tex expresion specified';
return;
}
$texexp = '\\Large ' . $texexp;
$image = $md5 . ".gif";
$filetype = 'image/gif';
if (!file_exists("{$CFG->dataroot}/filter/algebra")) {
make_upload_directory("filter/algebra");
}
$pathname = "{$CFG->dataroot}/filter/algebra/{$image}";
if (file_exists($pathname)) {
unlink($pathname);
}
$commandpath = tex_filter_get_executable(true);
$cmd = tex_filter_get_cmd($pathname, $texexp);
system($cmd, $status);
if ($return) {
return $image;
}
if (file_exists($pathname)) {
send_file($pathname, $image);
} 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!";
}
}
$latex = new latex();
$density = $CFG->filter_tex_density;
$background = $CFG->filter_tex_latexbackground;
$texexp = html_entity_decode($texcache->rawtext);
$latex_path = $latex->render($texexp, $md5, 12, $density, $background);
if ($latex_path) {
copy($latex_path, $pathname);
$latex->clean_up($md5);
} else {
// failing that, use mimetex
$texexp = $texcache->rawtext;
$texexp = str_replace('<', '<', $texexp);
$texexp = str_replace('>', '>', $texexp);
$texexp = preg_replace('!\\r\\n?!', ' ', $texexp);
$texexp = '\\Large ' . $texexp;
$cmd = tex_filter_get_cmd($pathname, $texexp);
system($cmd, $status);
}
}
}
if (file_exists($pathname)) {
send_file($pathname, $image);
} else {
if (debugging()) {
echo "The shell command<br />{$cmd}<br />returned status = {$status}<br />\n";
echo "Image not found!<br />";
echo "Please try the <a href=\"{$CFG->wwwroot}/filter/tex/texdebug.php\">debugging script</a>";
} else {
echo "Image not found!<br />";
echo "Please try the <a href=\"{$CFG->wwwroot}/filter/tex/texdebug.php\">debugging script</a><br />";
echo "Please turn on debug mode in site configuration to see more info here.";
