Updated Base32 method signatures.

VERSION

@@ -1 +1 @@
-0.2407.311820
+0.2407.311824

src/Serialisation/Base32.php

@@ -1,32 +1,29 @@
 <?php
 // Base32.php
 // Created: 2022-01-13
-// Updated: 2023-07-21
+// Updated: 2024-07-31
 
 namespace Index\Serialisation;
 
-use Index\IO\Stream;
-
 /**
- * Provides a Base32 serialiser.
+ * Provides Base32 encoding.
  */
 final class Base32 {
     private const CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
 
     /**
-     * Encodes binary data as a Base32 string.
+     * Encodes data with RFC4648 base32.
      *
-     * @param Stream|string $input Input binary data.
-     * @return string Base32 string representing the binary data.
+     * @param string $string The data to encode.
+     * @return string The encoded data, as a string.
      */
-    public static function encode(Stream|string $input): string {
-        $input = (string)$input;
-        $length = strlen($input);
+    public static function encode(string $string): string {
+        $length = strlen($string);
         $bin = '';
         $output = '';
 
         for($i = 0; $i < $length; $i++)
-            $bin .= sprintf('%08b', ord($input[$i]));
+            $bin .= sprintf('%08b', ord($string[$i]));
 
         $bin = str_split($bin, 5);
         $last = array_pop($bin);
@@ -39,20 +36,23 @@ final class Base32 {
     }
 
     /**
-     * Decodes a Base32 string back to binary data.
+     * Decodes data encoded with RFC4648 base32.
      *
-     * @param Stream|string $input Input Base32 string.
-     * @return string Binary data.
+     * @param string $string The encoded data.
+     * @return string|false Returns the decoded data or false on failure. The returned data may be binary.
      */
-    public static function decode(Stream|string $input): string {
-        $input = (string)$input;
-        $length = strlen($input);
+    public static function decode(string $string): string|false {
+        $length = strlen($string);
         $char = $shift = 0;
         $output = '';
 
         for($i = 0; $i < $length; $i++) {
+            $pos = stripos(self::CHARS, $string[$i]);
+            if($pos === false)
+                return false;
+
             $char <<= 5;
-            $char += stripos(self::CHARS, $input[$i]);
+            $char += $pos;
             $shift = ($shift + 5) % 8;
             $output .= $shift < 5 ? chr(($char & (0xFF << $shift)) >> $shift) : '';
         }