add few tools

.hta_lib/maxmind-db-reader/src/MaxMind/Db/Reader/Util.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MaxMind\Db\Reader;
+
+class Util
+{
+    /**
+     * @param resource    $stream
+     * @param int<0, max> $numberOfBytes
+     */
+    public static function read($stream, int $offset, int $numberOfBytes): string
+    {
+        if ($numberOfBytes === 0) {
+            return '';
+        }
+        if (fseek($stream, $offset) === 0) {
+            $value = fread($stream, $numberOfBytes);
+
+            // We check that the number of bytes read is equal to the number
+            // asked for. We use ftell as getting the length of $value is
+            // much slower.
+            if ($value !== false && ftell($stream) - $offset === $numberOfBytes) {
+                return $value;
+            }
+        }
+
+        throw new InvalidDatabaseException(
+            'The MaxMind DB file contains bad data'
+        );
+    }
+}