--- a/lib/Protobuf-PHP/library/DrSlump/Protobuf/Field.php
+++ b/lib/Protobuf-PHP/library/DrSlump/Protobuf/Field.php
@@ -1,1 +1,86 @@
+<?php
 
+namespace DrSlump\Protobuf;
+
+use DrSlump\Protobuf;
+
+class Field
+{
+    public $number;
+    public $name;
+    public $type = Protobuf::TYPE_UNKNOWN;
+    public $rule = Protobuf::RULE_OPTIONAL;
+    public $reference;
+    public $default;
+    public $packed = false;
+    public $extension = false;
+
+    public function __construct(array $opts = array())
+    {
+        if (!empty($opts)) {
+            if (isset($opts['number'])) $this->number = (int)$opts['number'];
+            if (isset($opts['name'])) $this->name = $opts['name'];
+            if (isset($opts['type'])) $this->type = (int)$opts['type'];
+            if (isset($opts['rule'])) $this->rule = (int)$opts['rule'];
+            if (isset($opts['packed'])) $this->packed = (bool)$opts['packed'];
+            if (isset($opts['reference'])) $this->reference = $opts['reference'];
+            if (isset($opts['default'])) $this->default = $opts['default'];
+            if (isset($opts['extension'])) $this->extension = (bool)$opts['extension'];
+        }
+    }
+
+    public function getNumber()
+    {
+        return $this->number;
+    }
+
+    public function getType()
+    {
+        return $this->type;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function getReference()
+    {
+        return $this->reference;
+    }
+
+    public function getDefault()
+    {
+        return $this->default;
+    }
+
+    public function hasDefault()
+    {
+        return $this->default !== NULL;
+    }
+
+    public function isOptional()
+    {
+        return $this->rule === Protobuf::RULE_OPTIONAL;
+    }
+
+    public function isRequired()
+    {
+        return $this->rule === Protobuf::RULE_REQUIRED;
+    }
+
+    public function isRepeated()
+    {
+        return $this->rule === Protobuf::RULE_REPEATED;
+    }
+
+    public function isPacked()
+    {
+        return $this->packed;
+    }
+
+    public function isExtension()
+    {
+        return $this->extension;
+    }
+}