Updated Base62 implementation.

VERSION

@@ -1 +1 @@
-0.2407.311824
+0.2407.311834

src/Serialisation/Base62.php

@@ -1,49 +1,52 @@
 <?php
 // Base62.php
 // Created: 2022-01-28
-// Updated: 2023-07-21
+// Updated: 2024-07-31
 
 namespace Index\Serialisation;
 
-use Index\IO\Stream;
-
 /**
  * Provides a Base62 serialiser.
  */
 final class Base62 {
     private const CHARS = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+    private const BASE = 62;
 
     /**
-     * Encodes an integer as a Base62 string.
+     * Converts a base10 integer to a base62 integer.
      *
-     * @param int $input Integer.
+     * @param int $integer The integer to encode.
-     * @return string Base64 string representing the integer.
+     * @return string The encoded data, as a string.
      */
-    public static function encode(int $input): string {
+    public static function encode(int $integer): string {
         $output = '';
 
-        for($i = floor(log10($input) / log10(62)); $i >= 0; --$i) {
+        for($i = floor(log10($integer) / log10(self::BASE)); $i >= 0; --$i) {
-            $index = (int)floor($input / (62 ** $i));
+            $index = (int)floor($integer / (self::BASE ** $i));
             $output .= substr(self::CHARS, $index, 1);
-            $input -= $index * (62 ** $i);
+            $integer -= $index * (self::BASE ** $i);
         }
 
         return $output;
     }
 
     /**
-     * Decodes a Base62 string back to an integer.
+     * Converts a base62 integer to a base10 integer.
      *
-     * @param Stream|string $input Input Base62 string.
+     * @param string $string The encoded integer.
-     * @return int Integer.
+     * @return int|false Returns the decoded integer or false on failure.
      */
-    public static function decode(Stream|string $input): int {
+    public static function decode(string $string): int|false {
-        $input = (string)$input;
         $output = 0;
-        $length = strlen($input) - 1;
+        $length = strlen($string) - 1;
 
-        for($i = 0; $i <= $length; ++$i)
+        for($i = 0; $i <= $length; ++$i) {
-            $output += strpos(self::CHARS, $input[$i]) * (62 ** ($length - $i));
+            $pos = strpos(self::CHARS, $string[$i]);
+            if($pos === false)
+                return false;
+
+            $output += $pos * (self::BASE ** ($length - $i));
+        }
 
         return $output;
     }