Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/zendframework/zend-diactoros/src/RelativeStream.php

@@ -0,0 +1,168 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @see       http://github.com/zendframework/zend-diactoros for the canonical source repository
+ * @copyright Copyright (c) 2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License
+ */
+
+namespace Zend\Diactoros;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Class RelativeStream
+ *
+ * Wrapper for default Stream class, representing subpart (starting from given offset) of initial stream.
+ * It can be used to avoid copying full stream, conserving memory.
+ * @example see Zend\Diactoros\AbstractSerializer::splitStream()
+ */
+final class RelativeStream implements StreamInterface
+{
+    /**
+     * @var StreamInterface
+     */
+    private $decoratedStream;
+
+    /**
+     * @var int
+     */
+    private $offset;
+
+    /**
+     * Class constructor
+     *
+     * @param StreamInterface $decoratedStream
+     * @param int $offset
+     */
+    public function __construct(StreamInterface $decoratedStream, $offset)
+    {
+        $this->decoratedStream = $decoratedStream;
+        $this->offset = (int)$offset;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __toString()
+    {
+        $this->seek(0);
+        return $this->getContents();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function close()
+    {
+        $this->decoratedStream->close();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function detach()
+    {
+        return $this->decoratedStream->detach();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSize()
+    {
+        return $this->decoratedStream->getSize() - $this->offset;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function tell()
+    {
+        return $this->decoratedStream->tell() - $this->offset;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function eof()
+    {
+        return $this->decoratedStream->eof();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isSeekable()
+    {
+        return $this->decoratedStream->isSeekable();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if ($whence == SEEK_SET) {
+            return $this->decoratedStream->seek($offset + $this->offset, $whence);
+        }
+        return $this->decoratedStream->seek($offset, $whence);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function rewind()
+    {
+        return $this->seek(0);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isWritable()
+    {
+        return $this->decoratedStream->isWritable();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function write($string)
+    {
+        return $this->decoratedStream->write($string);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isReadable()
+    {
+        return $this->decoratedStream->isReadable();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function read($length)
+    {
+        return $this->decoratedStream->read($length);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getContents()
+    {
+        return $this->decoratedStream->getContents();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getMetadata($key = null)
+    {
+        return $this->decoratedStream->getMetadata($key);
+    }
+}