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

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+<?php
+
+namespace Amp\ByteStream\Base64;
+
+use Amp\ByteStream\InputStream;
+use Amp\ByteStream\StreamException;
+use Amp\Promise;
+use function 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;
+        });
+    }
+}

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

@@ -0,0 +1,55 @@
+<?php
+
+namespace Amp\ByteStream\Base64;
+
+use Amp\ByteStream\OutputStream;
+use Amp\ByteStream\StreamException;
+use Amp\Failure;
+use 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);
+    }
+}

vendor/amphp/byte-stream/lib/Base64/Base64EncodingInputStream.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Amp\ByteStream\Base64;
+
+use Amp\ByteStream\InputStream;
+use Amp\Promise;
+use function Amp\call;
+
+final class Base64EncodingInputStream implements InputStream
+{
+    /** @var InputStream */
+    private $source;
+
+    /** @var string|null */
+    private $buffer = '';
+
+    public function __construct(InputStream $source)
+    {
+        $this->source = $source;
+    }
+
+    public function read(): Promise
+    {
+        return call(function () {
+            $chunk = yield $this->source->read();
+            if ($chunk === null) {
+                if ($this->buffer === null) {
+                    return null;
+                }
+
+                $chunk = \base64_encode($this->buffer);
+                $this->buffer = null;
+
+                return $chunk;
+            }
+
+            $this->buffer .= $chunk;
+
+            $length = \strlen($this->buffer);
+            $chunk = \base64_encode(\substr($this->buffer, 0, $length - $length % 3));
+            $this->buffer = \substr($this->buffer, $length - $length % 3);
+
+            return $chunk;
+        });
+    }
+}

vendor/amphp/byte-stream/lib/Base64/Base64EncodingOutputStream.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Amp\ByteStream\Base64;
+
+use Amp\ByteStream\OutputStream;
+use Amp\Promise;
+
+final class Base64EncodingOutputStream implements OutputStream
+{
+    /** @var OutputStream */
+    private $destination;
+
+    /** @var string */
+    private $buffer = '';
+
+    public function __construct(OutputStream $destination)
+    {
+        $this->destination = $destination;
+    }
+
+    public function write(string $data): Promise
+    {
+        $this->buffer .= $data;
+
+        $length = \strlen($this->buffer);
+        $chunk = \base64_encode(\substr($this->buffer, 0, $length - $length % 3));
+        $this->buffer = \substr($this->buffer, $length - $length % 3);
+
+        return $this->destination->write($chunk);
+    }
+
+    public function end(string $finalData = ""): Promise
+    {
+        $chunk = \base64_encode($this->buffer . $finalData);
+        $this->buffer = '';
+
+        return $this->destination->end($chunk);
+    }
+}