Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Component/Utility/Bytes.php

@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Utility\Bytes.
+ */
+
+namespace Drupal\Component\Utility;
+
+/**
+ * Provides helper methods for byte conversions.
+ */
+class Bytes {
+
+  /**
+   * The number of bytes in a kilobyte.
+   *
+   * @see http://en.wikipedia.org/wiki/Kilobyte
+   */
+  const KILOBYTE = 1024;
+
+  /**
+   * Parses a given byte size.
+   *
+   * @param mixed $size
+   *   An integer or string size expressed as a number of bytes with optional SI
+   *   or IEC binary unit prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8 bytes, 9mbytes).
+   *
+   * @return int
+   *   An integer representation of the size in bytes.
+   */
+  public static function toInt($size) {
+    // Remove the non-unit characters from the size.
+    $unit = preg_replace('/[^bkmgtpezy]/i', '', $size);
+    // Remove the non-numeric characters from the size.
+    $size = preg_replace('/[^0-9\.]/', '', $size);
+    if ($unit) {
+      // Find the position of the unit in the ordered string which is the power
+      // of magnitude to multiply a kilobyte by.
+      return round($size * pow(self::KILOBYTE, stripos('bkmgtpezy', $unit[0])));
+    }
+    else {
+      return round($size);
+    }
+  }
+
+}