From 78b052a6af5fc7c87c807821bfc9267f8007ed7b Mon Sep 17 00:00:00 2001
From: Dries Buytaert <dries@buytaert.net>
Date: Tue, 17 Aug 2004 21:35:26 +0000
Subject: - The upload (filehandler) module has landed!

---
 includes/common.inc | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'includes/common.inc')

diff --git a/includes/common.inc b/includes/common.inc
index a15c0942e..cda083867 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -1794,6 +1794,34 @@ function truncate_utf8($string, $len) {
   return substr($string, 0, $len);
 }
 
+/**
+ * Encodes MIME/HTTP header values that contain non US-ASCII
+ * characters.
+ *
+ * Example: mime_header_encode('tést.txt') returns '=?UTF-8?B?dMOpc3QudHh0?='
+ *
+ * For more info: http://www.rfc-editor.org/rfc/rfc2047.txt
+ *
+ */
+function mime_header_encode($string, $charset = 'UTF-8') {
+  // Notes:
+  //   - Only encode strings that contain non-ASCII characters.
+  //   - The chunks come in groupings of 4 bytes when using base64
+  //     encoded.
+  //   - trim() is used to ensure that no extra spacing is added by
+  //     chunk_split() or preg_replace().
+  //   - Using \n as the chunk separator may cause problems on some
+  //     systems and may have to be changed to \r\n or \r.
+
+  if (!preg_match('/^[\x20-\x7E]*$/', $string)) {
+    $chunk_size = 75 - 7 - strlen($charset);
+    $chunk_size -= $chunk_size % 4;
+    $string = trim(chunk_split(base64_encode($string), $chunk_size, "\n"));
+    $string = trim(preg_replace('/^(.*)$/m', " =?$charset?B?\\1?=", $string));
+  }
+  return $string;
+}
+
 /**
  * Wrapper around PHP's eval(). Uses output buffering to capture both returned
  * and printed text. Unlike eval(), we require code to be surrounded by <?php ?>
-- 
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