1 files changed, 69 insertions, 0 deletions
diff --git a/PHP_DW.php b/PHP_DW.php
new file mode 100644
index 0000000..ee6a835
--- /dev/null
+++ b/PHP_DW.php
@@ -0,0 +1,69 @@
+<?php
+
+class PHP_DW {
+    private $base_dw = 'downloads';
+    private $base_count = '.count';
+
+    private function __get_full_path($path) {
+        if (basename($path) !== $path) {
+            return null;
+        }
+
+        return $this->base_dw . '/' . $path;
+    }
+
+    private function __incr_count($filename) {
+        $fh = fopen($this->base_count . '/' . $filename . '.cnt', "a+");
+
+        if (is_resource($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) {
+        $path = $this->__get_full_path($filename) or die('invalid file');
+
+        $ret = @readfile($path);
+        if ($ret) {
+            header('Content-Description: File Transfer');
+            header('Content-Disposition: attachment; filename=' . $filename);
+            header('Content-Length: '. filesize($path));
+            header('Cache-Control: must-revalidate');
+
+            $this->__incr_count($filename);
+        } else {
+            die('no such file or directory');
+        }
+    }
+
+    public function get_count($filename) {
+        if (!$this->__get_full_path($filename))
+            return 0;
+
+        $fh = @fopen($this->base_count . '/' . $filename . '.cnt', "r");
+
+        if (!is_resource($fh))
+            return 0;
+
+        $count = fgets($fh) or '0';
+
+        fclose($fh);
+
+        return $count;
+    }
+}
+?>