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<?php
include_once $_SERVER['DOCUMENT_ROOT'] . '/../config.php';
function is_swf_file($filename)
{
if (!is_readable($filename)) {
return false;
}
$fh = fopen($filename, 'rb');
if (!$fh)
return false;
$header = fread($fh, 8);
fclose($fh);
if (strlen($header) < 8) {
return false;
}
$signature = substr($header, 0, 3);
$version = ord($header[3]);
if (in_array($signature, ['FWS', 'CWS', 'ZWS'])) {
if ($version >= 6 && $version <= 50) {
return true;
}
}
return false;
}
function parse_swf_file(string $file_path): array
{
$fh = fopen($file_path, 'rb');
if (!$fh) {
throw new RuntimeException('Failed to open the file!');
}
$chunk = fread($fh, 512 * 1024);
fclose($fh);
if (strlen($chunk) < 9) {
throw new RuntimeException('File too short.');
}
$signature = substr($chunk, 0, 3);
if (!in_array($signature, ['FWS', 'CWS', 'ZWS'])) {
throw new RuntimeException('Not a valid SWF.');
}
if ($signature === 'CWS') {
$decompressed = gzuncompress(substr($chunk, 8));
if ($decompressed === false) {
throw new RuntimeException('Bad compressed SWF.');
}
$data = $decompressed;
} else if ($signature === 'ZWS') {
throw new RuntimeException('LZMA SWF is not supported');
} else {
$data = substr($chunk, 8);
}
$bits = ord($data[0]) >> 3;
$bitstr = '';
for ($i = 0; $i < ceil((5 + 4 * $bits) / 8); $i++) {
$bitstr .= str_pad(decbin(ord($data[$i])), 8, '0', STR_PAD_LEFT);
}
$nbits = bindec(substr($bitstr, 0, 5));
$pos = 5;
$xmin = bindec(substr($bitstr, $pos, $nbits));
$pos += $nbits;
$xmax = bindec(substr($bitstr, $pos, $nbits));
$pos += $nbits;
$ymin = bindec(substr($bitstr, $pos, $nbits));
$pos += $nbits;
$ymax = bindec(substr($bitstr, $pos, $nbits));
$pos += $nbits;
$width = ($xmax - $xmin) / 20;
$height = ($ymax - $ymin) / 20;
return [$width, $height];
}
function verify_mimetype(string $file_path, string $mimetype): bool
{
$path = escapeshellarg($file_path);
$output = [];
$exitCode = 0;
if (str_starts_with($mimetype, 'image/')) {
$output = shell_exec("identify -quiet -ping $path");
return !empty($output);
} else if (str_starts_with($mimetype, 'video/') || str_starts_with($mimetype, 'audio/')) {
$cmd = "ffprobe -v error -i $path 2>&1";
exec($cmd, $output, $exitCode);
return $exitCode === 0;
} else if ($mimetype == 'application/x-shockwave-flash') {
return is_swf_file($file_path);
}
throw new RuntimeException("Illegal type for MIME verifications: $mimetype");
}
function delete_file(string $file_id, string $file_extension, PDO|null $db = null): bool
{
$paths = [
FILE_UPLOAD_DIRECTORY . "/{$file_id}.{$file_extension}",
FILE_THUMBNAIL_DIRECTORY . "/{$file_id}.webp"
];
foreach ($paths as $path) {
if (is_file($path) && !unlink($path)) {
return false;
}
}
if ($db) {
$db->prepare('DELETE FROM files WHERE id = ? AND extension = ?')->execute([$file_id, $file_extension]);
}
return true;
}
function strip_exif(string $file_path)
{
$file_path = escapeshellarg($file_path);
$output = shell_exec("exiftool -q -EXIF= $file_path $file_path");
return empty($output);
}
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