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<?php
class PHP_DW {
private $dw_dir = 'downloads';
private $cnt_dir = '.count';
function __construct($dw_dir = false, $cnt_dir = false) {
if ($dw_dir) {
$this->dw_dir = $dw_dir;
}
if ($cnt_dir) {
$this->cnt_dir = $cnt_dir;
}
}
private function __get_full_path($path) {
if (basename($path) !== $path) {
return null;
}
return $this->dw_dir . '/' . $path;
}
private function __incr_count($filename) {
$fh = @fopen($this->cnt_dir . '/' . $filename . '.cnt', "a+");
if (is_resource($fh) and flock($fh, LOCK_EX)) {
rewind($fh);
$count = fgets($fh);
if ($count === false)
$count = 0;
$count++;
ftruncate($fh, 0);
fwrite($fh, $count);
flock($fh, LOCK_UN);
fclose($fh);
}
}
public function download($filename) {
/* according to stat(2) */
define('S_IFMT', 0170000);
define('S_IFREG', 0100000);
$path = $this->__get_full_path($filename) or die('invalid file');
$fh = @fopen($path, 'rb');
if ($fh) {
$fstats = fstat($fh);
/* check if the target is a regular file */
if (S_IFREG == ($fstats['mode'] & S_IFMT)) {
$this->__incr_count($filename);
header('Content-Description: File Transfer');
header('Content-Disposition: attachment; filename=' . $filename);
header('Content-Length: '. $fstats['size']);
header('Cache-Control: private');
echo(fread($fh, $fstats['size']));
} else {
echo($path . ': is not a regular file');
}
fclose($fh);
} else {
echo($path . ': no such file or directory');
}
}
public function get_count($filename) {
if (!$this->__get_full_path($filename))
return 0;
$fh = @fopen($this->cnt_dir . '/' . $filename . '.cnt', "r");
if (!is_resource($fh))
return 0;
$count = fgets($fh) or '0';
fclose($fh);
return $count;
}
public function get_count_dir() {
return $this->cnt_dir;
}
public function get_download_dir() {
return $this->dw_dir;
}
}
?>
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