--- a/lib/Protobuf-PHP/library/DrSlump/Protobuf/Codec/TextFormat.php
+++ b/lib/Protobuf-PHP/library/DrSlump/Protobuf/Codec/TextFormat.php
@@ -1,1 +1,82 @@
+<?php
 
+namespace DrSlump\Protobuf\Codec;
+
+use DrSlump\Protobuf;
+
+/**
+ * This codec serializes to Protobuf's TextFormat, unserialization
+ * is not supported.
+ *
+ */
+class TextFormat implements Protobuf\CodecInterface
+{
+    /**
+     * @param \DrSlump\Protobuf\Message $message
+     * @return string
+     */
+    public function encode(Protobuf\Message $message)
+    {
+        return $this->encodeMessage($message);
+    }
+
+    /**
+     *
+     * @throw \DrSlump\Protobuf\Exception - Decoding is not supported
+     * @param \DrSlump\Protobuf\Message $message
+     * @param String $data
+     * @return \DrSlump\Protobuf\Message
+     */
+    public function decode(Protobuf\Message $message, $data)
+    {
+        throw new \BadMethodCallException('TextFormat codec does not support decoding');
+    }
+
+    protected function encodeMessage(Protobuf\Message $message, $level = 0)
+    {
+        $descriptor = Protobuf::getRegistry()->getDescriptor($message);
+
+        $indent = str_repeat('  ', $level);
+        $data = '';
+        foreach ($descriptor->getFields() as $tag=>$field) {
+
+            $empty = !$message->_has($tag);
+            if ($field->isRequired() && $empty) {
+                throw new \UnexpectedValueException(
+                    'Message ' . get_class($message) . '\'s field tag ' . $tag . '(' . $field->getName() . ') is required but has no value'
+                );
+            }
+
+            if ($empty) {
+                continue;
+            }
+
+            $name = $field->getName();
+            $value = $message->_get($tag);
+
+            if ($field->isRepeated()) {
+                foreach ($value as $val) {
+                    if ($field->getType() !== Protobuf::TYPE_MESSAGE) {
+                        $data .= $indent . $name . ': ' . json_encode($val) . "\n";
+                    } else {
+                        $data .= $indent . $name . " {\n";
+                        $data .= $this->encodeMessage($val, $level+1);
+                        $data .= $indent . "}\n";
+                    }
+                }
+            } else {
+                if ($field->getType() === Protobuf::TYPE_MESSAGE) {
+                    $data .= $indent . $name . " {\n";
+                    $data .= $this->encodeMessage($value, $level+1);
+                    $data .= $indent . "}\n";
+                } else {
+                    $data .= $indent . $name . ': ' . json_encode($value) . "\n";
+                }
+            }
+        }
+
+        return $data;
+    }
+}
+
+