Improve base32 package implementation by removing regexp usage

src/Base32/Base32.php

@@ -52,7 +52,7 @@ public function decode(string $encoded, bool $strict = false): string
 
         $alphabet = $this->alphabet;
         $padding = $this->padding;
-        $encoded = str_replace(["\r", "\n"], [''], $encoded);
+        $encoded = str_replace(["\r", "\n", ' '], [''], $encoded);
         if (!$strict) {
             $alphabet = strtoupper($alphabet);
             $padding = strtoupper($padding);
@@ -61,45 +61,45 @@ public function decode(string $encoded, bool $strict = false): string
 
         $remainder = strlen($encoded) % 8;
         if (0 !== $remainder) {
-            if ($strict) {
+            $encoded .= !$strict ?
+                str_repeat($padding, $remainder) :
                 throw new RuntimeException('The encoded data length is invalid.');
-            }
-
-            $encoded .= str_repeat($padding, $remainder);
         }
 
         $inside = rtrim($encoded, $padding);
         $end = substr($encoded, strlen($inside));
-        if ($strict && !in_array(strlen($end), [3, 4, 6, 0], true)) {
-            throw new RuntimeException('The encoded data contains an invalid padding character length.');
+        if ($strict && !in_array(strlen($end), [0, 1, 3, 4, 6], true)) {
+            throw new RuntimeException('The encoded data contains an invalid padding sequence length.');
         }
 
         if (str_contains($inside, $padding)) {
-            if ($strict) {
+            $encoded = !$strict ?
+                str_replace($padding, '', $inside).$end :
                 throw new RuntimeException('The encoded data contains the padding character.');
-            }
-            $encoded = str_replace($padding, '', $inside).$end;
         }
 
         $characters = $alphabet.$padding;
-        if (strspn($encoded, $characters) !== strlen($encoded)) {
-            if ($strict) {
-                throw new RuntimeException('The encoded data contains characters unknown to the alphabet.');
-            }
-            $encoded = preg_replace('/[^'.preg_quote($characters, '/').']/', '', $encoded);
-            if ('' === $encoded || null === $encoded) {
-                return '';
-            }
+        if ($strict && (strspn($encoded, $characters) !== strlen($encoded))) {
+            throw new RuntimeException('The encoded data contains characters unknown to the alphabet.');
         }
 
         $decoded = '';
         $offset = 0;
         $bitLen = 5;
         $length = strlen($encoded);
         $chars = array_combine(str_split($characters), [...range(0, 31), 0]);
-        $val = $chars[$encoded[0]];
+        $val = $chars[$encoded[$offset]] ?? -1;
 
         while ($offset < $length) {
+            if (!$strict && $val === -1) {
+                $offset++;
+                if ($offset === $length) {
+                    break;
+                }
+                $val = $chars[$encoded[$offset]] ?? -1;
+                continue;
+            }
+
             if ($bitLen < 8) {
                 $bitLen += 5;
                 $offset++;