function GetJpegInfo($file)
{
$info = array('jpeg' => false, 'filesize' => 0, 'imagedata' => 0, 'appdata' => 0, 'progressive' => false, 'commentsize' => 0, 'comment' => '', 'scans' => 0);
$bytes = file_get_contents($file);
if ($bytes !== false) {
$i = 0;
$size = $info['filesize'] = strlen($bytes);
while (FindNextMarker($bytes, $size, $i, $marker, $marker_length)) {
$marker = bin2hex($marker);
if ($marker == 'ffd8') {
$info['jpeg'] = true;
} elseif ($marker == 'ffc2') {
$info['progressive'] = true;
} elseif ($marker == 'ffda') {
$info['scans']++;
} elseif ($marker == 'fffe') {
$info['commentsize'] += $marker_length;
$info['comment'] = substr($bytes, $i, $marker_length);
} elseif (substr($marker, 0, 3) == 'ffe') {
$info['appdata'] += $marker_length;
}
if (substr($marker, 0, 3) == 'ffc' || substr($marker, 0, 3) == 'ffd') {
$info['imagedata'] += $marker_length;
}
$i += $marker_length;
}
}
if (!$info['jpeg']) {
$info = false;
}
return $info;
}
function FindNextScan(&$bytes, $size, &$i)
{
$found = false;
if ($i < $size) {
while (!$found && FindNextMarker($bytes, $size, $i, $marker, $marker_length)) {
if (bin2hex($marker) == 'ffda') {
$found = true;
}
$i += $marker_length;
}
if (!$found) {
$found = true;
$i = $size;
}
}
return $found;
}