From c002ca9c6ba1d40cda342ca85fb48acda39d7e52 Mon Sep 17 00:00:00 2001
From: Alexandre Alapetite <alexandre@alapetite.fr>
Date: Sun, 10 Nov 2013 22:50:34 +0100
Subject: [PATCH] smallHash: simplified and improved performance

Unchanged behaviour
---
 index.php | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/index.php b/index.php
index 0465a4e5..24fbe436 100644
--- a/index.php
+++ b/index.php
@@ -221,7 +221,7 @@ function nl2br_escaped($html)
     return str_replace('>','&gt;',str_replace('<','&lt;',nl2br($html)));
 }
 
-/* Returns the small hash of a string
+/* Returns the small hash of a string, using RFC 4648 base64url format
    eg. smallHash('20111006_131924') --> yZH23w
    Small hashes:
      - are unique (well, as unique as crc32, at last)
@@ -233,10 +233,7 @@ function nl2br_escaped($html)
 function smallHash($text)
 {
     $t = rtrim(base64_encode(hash('crc32',$text,true)),'=');
-    $t = str_replace('+','-',$t); // Get rid of characters which need encoding in URLs.
-    $t = str_replace('/','_',$t);
-    $t = str_replace('=','@',$t);
-    return $t;
+    return strtr($t, '+/', '-_');
 }
 
 // In a string, converts urls to clickable links.
-- 
2.41.0