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diff --git a/include/jsoncons_ext/cbor/cbor_detail.hpp b/include/jsoncons_ext/cbor/cbor_detail.hpp
new file mode 100644
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+++ b/include/jsoncons_ext/cbor/cbor_detail.hpp
@@ -0,0 +1,93 @@
+// Copyright 2017 Daniel Parker
+// Distributed under the Boost license, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See https://github.com/danielaparker/jsoncons for latest version
+
+#ifndef JSONCONS_CBOR_CBOR_DETAIL_HPP
+#define JSONCONS_CBOR_CBOR_DETAIL_HPP
+
+#include <string>
+#include <vector>
+#include <memory>
+#include <iterator> // std::forward_iterator_tag
+#include <limits> // std::numeric_limits
+#include <utility> // std::move
+#include <jsoncons/json.hpp>
+#include <jsoncons/json_visitor.hpp>
+#include <jsoncons/config/jsoncons_config.hpp>
+
+// 0x00..0x17 (0..23)
+#define JSONCONS_CBOR_0x00_0x17 \
+    0x00:case 0x01:case 0x02:case 0x03:case 0x04:case 0x05:case 0x06:case 0x07:case 0x08:case 0x09:case 0x0a:case 0x0b:case 0x0c:case 0x0d:case 0x0e:case 0x0f:case 0x10:case 0x11:case 0x12:case 0x13:case 0x14:case 0x15:case 0x16:case 0x17
+
+#define JSONCONS_CBOR_ARRAY_TAGS \
+    0x40:case 0x41:case 0x42:case 0x43:case 0x44:case 0x45:case 0x46:case 0x47:case 0x48:case 0x49:case 0x4a:case 0x4b:case 0x4c:case 0x4d:case 0x4e:case 0x4f:case 0x50:case 0x51:case 0x52:case 0x53:case 0x54:case 0x55:case 0x56:case 0x57    
+
+namespace jsoncons { namespace cbor { namespace detail {
+
+//const uint8_t cbor_array_tags_010_mask = 0b11100000;
+//const uint8_t cbor_array_tags_f_mask = 0b00010000;
+//const uint8_t cbor_array_tags_s_mask = 0b00001000;
+//const uint8_t cbor_array_tags_e_mask = 0b00000100;
+//const uint8_t cbor_array_tags_ll_mask = 0b00000011;
+
+const uint8_t cbor_array_tags_010_mask = 0xE0;
+const uint8_t cbor_array_tags_f_mask = 0x10;
+const uint8_t cbor_array_tags_s_mask = 0x08;
+const uint8_t cbor_array_tags_e_mask = 0x04;
+const uint8_t cbor_array_tags_ll_mask = 0x03;
+
+const uint8_t cbor_array_tags_010_shift = 5;
+const uint8_t cbor_array_tags_f_shift = 4;
+const uint8_t cbor_array_tags_s_shift = 3;
+const uint8_t cbor_array_tags_e_shift = 2;
+const uint8_t cbor_array_tags_ll_shift = 0;
+
+enum class cbor_major_type : uint8_t
+{
+    unsigned_integer = 0x00,
+    negative_integer = 0x01,
+    byte_string = 0x02,
+    text_string = 0x03,
+    array = 0x04,
+    map = 0x05,   
+    semantic_tag = 0x06,
+    simple = 0x7
+};
+
+namespace additional_info
+{
+    const uint8_t indefinite_length = 0x1f;
+}
+
+inline
+size_t min_length_for_stringref(uint64_t index)
+{
+    std::size_t n;
+    if (index <= 23)
+    {
+        n = 3;
+    }
+    else if (index <= 255)
+    {
+        n = 4;
+    }
+    else if (index <= 65535)
+    {
+        n = 5;
+    }
+    else if (index <= 4294967295)
+    {
+        n = 7;
+    }
+    else 
+    {
+        n = 11;
+    }
+    return n;
+}
+
+}}}
+
+#endif