Merge pull request #100 from php-http/feature/not-seekable-filtered-s…

…tream

Filtered Stream is not seekable

src/Encoding/FilteredStream.php

@@ -161,6 +161,30 @@ public function __toString()
         return $this->getContents();
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function isSeekable()
+    {
+        return false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function rewind()
+    {
+        throw new \RuntimeException('Cannot rewind a filtered stream');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a filtered stream');
+    }
+
     /**
      * Returns the read filter name.
      *