Initial Commit

dependencies/amphp/byte-stream/lib/Base64/Base64DecodingOutputStream.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\Amp\ByteStream\Base64;
+
+use WP_Ultimo\Dependencies\Amp\ByteStream\OutputStream;
+use WP_Ultimo\Dependencies\Amp\ByteStream\StreamException;
+use WP_Ultimo\Dependencies\Amp\Failure;
+use WP_Ultimo\Dependencies\Amp\Promise;
+final class Base64DecodingOutputStream implements OutputStream
+{
+    /** @var OutputStream */
+    private $destination;
+    /** @var string */
+    private $buffer = '';
+    /** @var int */
+    private $offset = 0;
+    public function __construct(OutputStream $destination)
+    {
+        $this->destination = $destination;
+    }
+    public function write(string $data) : Promise
+    {
+        $this->buffer .= $data;
+        $length = \strlen($this->buffer);
+        $chunk = \base64_decode(\substr($this->buffer, 0, $length - $length % 4), \true);
+        if ($chunk === \false) {
+            return new Failure(new StreamException('Invalid base64 near offset ' . $this->offset));
+        }
+        $this->offset += $length - $length % 4;
+        $this->buffer = \substr($this->buffer, $length - $length % 4);
+        return $this->destination->write($chunk);
+    }
+    public function end(string $finalData = "") : Promise
+    {
+        $this->offset += \strlen($this->buffer);
+        $chunk = \base64_decode($this->buffer . $finalData, \true);
+        if ($chunk === \false) {
+            return new Failure(new StreamException('Invalid base64 near offset ' . $this->offset));
+        }
+        $this->buffer = '';
+        return $this->destination->end($chunk);
+    }
+}