Initial Commit

dependencies/amphp/byte-stream/lib/Base64/Base64DecodingInputStream.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\Amp\ByteStream\Base64;
+
+use WP_Ultimo\Dependencies\Amp\ByteStream\InputStream;
+use WP_Ultimo\Dependencies\Amp\ByteStream\StreamException;
+use WP_Ultimo\Dependencies\Amp\Promise;
+use function WP_Ultimo\Dependencies\Amp\call;
+final class Base64DecodingInputStream implements InputStream
+{
+    /** @var InputStream|null */
+    private $source;
+    /** @var string|null */
+    private $buffer = '';
+    public function __construct(InputStream $source)
+    {
+        $this->source = $source;
+    }
+    public function read() : Promise
+    {
+        return call(function () {
+            if ($this->source === null) {
+                throw new StreamException('Failed to read stream chunk due to invalid base64 data');
+            }
+            $chunk = (yield $this->source->read());
+            if ($chunk === null) {
+                if ($this->buffer === null) {
+                    return null;
+                }
+                $chunk = \base64_decode($this->buffer, \true);
+                if ($chunk === \false) {
+                    $this->source = null;
+                    $this->buffer = null;
+                    throw new StreamException('Failed to read stream chunk due to invalid base64 data');
+                }
+                $this->buffer = null;
+                return $chunk;
+            }
+            $this->buffer .= $chunk;
+            $length = \strlen($this->buffer);
+            $chunk = \base64_decode(\substr($this->buffer, 0, $length - $length % 4), \true);
+            if ($chunk === \false) {
+                $this->source = null;
+                $this->buffer = null;
+                throw new StreamException('Failed to read stream chunk due to invalid base64 data');
+            }
+            $this->buffer = \substr($this->buffer, $length - $length % 4);
+            return $chunk;
+        });
+    }
+}