e_file_inspector_json_phar: Smaller core image

e_file_inspector_json_phar is an extended implementation of
e_file_inspector_json that encapsulates a JSON core image into a
gzip-compressed phar.

This results in space savings of over 60% compared to plain JSON.

e107_handlers/e_file_inspector_json_phar.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * e107 website system
+ *
+ * Copyright (C) 2008-2020 e107 Inc (e107.org)
+ * Released under the terms and conditions of the
+ * GNU General Public License (http://www.gnu.org/licenses/gpl.txt)
+ */
+
+require_once("e_file_inspector_json.php");
+
+class e_file_inspector_json_phar extends e_file_inspector_json
+{
+    /**
+     * @param $jsonPharFilePath string Absolute path to the file inspector database
+     */
+    public function __construct($jsonPharFilePath = null)
+    {
+        parent::__construct($jsonPharFilePath);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function loadDatabase()
+    {
+        Phar::loadPhar($this->database, "core_image.phar");
+        $tmpFile = tmpfile();
+        $tmpFilePath = stream_get_meta_data($tmpFile)['uri'];
+        $this->copyUrlToResource("phar://core_image.phar/core_image.json", $tmpFile);
+        $this->coreImage = json_decode(file_get_contents($tmpFilePath), true);
+        if (!is_array($this->coreImage)) $this->coreImage = [];
+        $this->coreImage = self::array_slash($this->coreImage);
+        if (!$this->coreImage) $this->coreImage = [];
+    }
+
+    /**
+     * Copy file to destination with low memory footprint
+     * @param $source string URL of the source
+     * @param $destination resource File pointer of the destination
+     */
+    private function copyUrlToResource($source, $destination)
+    {
+        $dbFile = fopen($source, "r");
+        while (!feof($dbFile))
+        {
+            $buffer = fread($dbFile, 4096);
+            fwrite($destination, $buffer);
+        }
+        unset($buffer);
+        fclose($dbFile);
+    }
+}