Merge branch 'MAGETWO-48894-fwrite-truncation-on-resource' into MAGETWO-43351-cart-price-rule-form

Author: MaxSavich

lib/internal/Magento/Framework/Filesystem/Driver/File.php

@@ -701,18 +701,36 @@ public function fileClose($resource)
      */
     public function fileWrite($resource, $data)
     {
-        $result = @fwrite($resource, $data);
-        if (false === $result) {
-            throw new FileSystemException(
-                new \Magento\Framework\Phrase(
+        $lenData = strlen($data);
+        for ($result = 0; $result < $lenData; $result += $fwrite) {
+            $fwrite = @fwrite($resource, substr($data, $result));
+            if (0 === $fwrite) {
+                $this->fileSystemException('Unable to write');
+            }
+            if (false === $fwrite) {
+                $this->fileSystemException(
                     'Error occurred during execution of fileWrite %1',
                     [$this->getWarningMessage()]
-                )
-            );
+                );
+            }
         }
+
         return $result;
     }
 
+    /**
+     * Throw a FileSystemException with a Phrase of message and optional arguments
+     *
+     * @param string $message
+     * @param array $arguments
+     * @return void
+     * @throws FileSystemException
+     */
+    private function fileSystemException($message, $arguments = [])
+    {
+        throw new FileSystemException(new \Magento\Framework\Phrase($message, $arguments));
+    }
+
     /**
      * Writes one CSV row to the file.
      *