function filter_tex_get_cmd($pathname, $texexp)
{
$texexp = filter_tex_sanitize_formula($texexp);
$texexp = escapeshellarg($texexp);
$executable = filter_tex_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}\" -- {$texexp}";
}
}
function tex2image($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 = filter_tex_get_executable(true);
$cmd = filter_tex_get_cmd($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 {$commandpath} not found!<br />";
}
echo "Image not found!";
}
}
function tex2image($texexp, $return=false) {
global $CFG;
if (!$texexp) {
echo 'No tex expresion specified';
return;
}
$image = md5($texexp) . ".gif";
$filetype = 'image/gif';
if (!file_exists("$CFG->dataroot/filter/tex")) {
make_upload_directory("filter/tex");
}
$pathname = "$CFG->dataroot/filter/tex/$image";
if (file_exists($pathname)) {
unlink($pathname);
}
$texexp = '\Large '.$texexp;
$commandpath = filter_tex_get_executable(true);
$cmd = filter_tex_get_cmd($pathname, $texexp);
system($cmd, $status);
if ($return) {
return $image;
}
if (file_exists($pathname)) {
send_file($pathname, $image);
} else if (debugging()) {
$ecmd = "$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!";
} else {
echo "Can not output detailed information due to security concerns, please turn on debug mode first.";
}
}
