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diff --git a/include/jsoncons_ext/bson/bson_oid.hpp b/include/jsoncons_ext/bson/bson_oid.hpp
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+++ b/include/jsoncons_ext/bson/bson_oid.hpp
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+#ifndef JSONCONS_BSON_BSON_OID_HPP
+#define JSONCONS_BSON_BSON_OID_HPP
+
+/*
+ *  Implements class oid_t and non member function bson_oid_to_string
+ *  
+ *  Based on the libjson functions bson_oid_to_string 
+ *  and bson_oid_init_from_string_unsafe , available at
+ *  https://github.com/mongodb/mongo-c-driver/blob/master/src/libbson/src/bson/bson-oid.h
+ *  and https://github.com/mongodb/mongo-c-driver/blob/master/src/libbson/src/bson/bson-oid.c
+ *  
+*/
+
+/*
+ * Copyright 2015 MongoDB, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <cstdlib>
+#include <cstring>
+#include <ctype.h>
+#include <system_error>
+#include <algorithm>
+#include <string>
+#include <type_traits>
+#include <array>
+#include <jsoncons/config/jsoncons_config.hpp>
+
+namespace jsoncons { namespace bson {
+
+    class oid_t
+    {
+        std::array<uint8_t,12> bytes_;
+    public:
+        using iterator = std::array<uint8_t,12>::iterator;
+        using const_iterator = std::array<uint8_t,12>::const_iterator;
+
+        oid_t(const std::array<uint8_t,12>& bytes)
+            : bytes_(bytes)
+        {
+        }
+        oid_t(uint8_t data[12])
+        {
+            std::memcpy(bytes_.data(),data,12);
+        }
+
+        oid_t(const string_view& str)
+        {
+            for (std::size_t i = 0; i < bytes_.size(); i++) 
+            {
+               bytes_[i] = ((parse_hex_char (str[2 * i]) << 4) |
+                           (parse_hex_char (str[2 * i + 1])));
+            }
+        }
+
+        const uint8_t* data() const
+        {
+            return bytes_.data();
+        }
+
+        std::size_t size() const
+        {
+            return bytes_.size();
+        }
+
+        iterator begin()
+        {
+            return bytes_.begin();
+        }
+
+        iterator end()
+        {
+            return bytes_.end();
+        }
+
+        const_iterator begin() const
+        {
+            return bytes_.begin();
+        }
+
+        const_iterator end() const
+        {
+            return bytes_.end();
+        }
+
+    private:
+
+        static uint8_t parse_hex_char (char hex)
+        {
+           switch (hex) {
+           case '0':
+              return 0;
+           case '1':
+              return 1;
+           case '2':
+              return 2;
+           case '3':
+              return 3;
+           case '4':
+              return 4;
+           case '5':
+              return 5;
+           case '6':
+              return 6;
+           case '7':
+              return 7;
+           case '8':
+              return 8;
+           case '9':
+              return 9;
+           case 'a':
+           case 'A':
+              return 0xa;
+           case 'b':
+           case 'B':
+              return 0xb;
+           case 'c':
+           case 'C':
+              return 0xc;
+           case 'd':
+           case 'D':
+              return 0xd;
+           case 'e':
+           case 'E':
+              return 0xe;
+           case 'f':
+           case 'F':
+              return 0xf;
+           default:
+              return 0;
+           }
+        }
+    };
+
+    namespace detail {
+
+        inline
+        const uint16_t* get_hex_char_pairs(std::true_type) // big endian
+        {
+            static const uint16_t hex_char_pairs[] = {
+               12336, 12337, 12338, 12339, 12340, 12341, 12342, 12343, 12344, 12345, 12385,
+               12386, 12387, 12388, 12389, 12390, 12592, 12593, 12594, 12595, 12596, 12597,
+               12598, 12599, 12600, 12601, 12641, 12642, 12643, 12644, 12645, 12646, 12848,
+               12849, 12850, 12851, 12852, 12853, 12854, 12855, 12856, 12857, 12897, 12898,
+               12899, 12900, 12901, 12902, 13104, 13105, 13106, 13107, 13108, 13109, 13110,
+               13111, 13112, 13113, 13153, 13154, 13155, 13156, 13157, 13158, 13360, 13361,
+               13362, 13363, 13364, 13365, 13366, 13367, 13368, 13369, 13409, 13410, 13411,
+               13412, 13413, 13414, 13616, 13617, 13618, 13619, 13620, 13621, 13622, 13623,
+               13624, 13625, 13665, 13666, 13667, 13668, 13669, 13670, 13872, 13873, 13874,
+               13875, 13876, 13877, 13878, 13879, 13880, 13881, 13921, 13922, 13923, 13924,
+               13925, 13926, 14128, 14129, 14130, 14131, 14132, 14133, 14134, 14135, 14136,
+               14137, 14177, 14178, 14179, 14180, 14181, 14182, 14384, 14385, 14386, 14387,
+               14388, 14389, 14390, 14391, 14392, 14393, 14433, 14434, 14435, 14436, 14437,
+               14438, 14640, 14641, 14642, 14643, 14644, 14645, 14646, 14647, 14648, 14649,
+               14689, 14690, 14691, 14692, 14693, 14694, 24880, 24881, 24882, 24883, 24884,
+               24885, 24886, 24887, 24888, 24889, 24929, 24930, 24931, 24932, 24933, 24934,
+               25136, 25137, 25138, 25139, 25140, 25141, 25142, 25143, 25144, 25145, 25185,
+               25186, 25187, 25188, 25189, 25190, 25392, 25393, 25394, 25395, 25396, 25397,
+               25398, 25399, 25400, 25401, 25441, 25442, 25443, 25444, 25445, 25446, 25648,
+               25649, 25650, 25651, 25652, 25653, 25654, 25655, 25656, 25657, 25697, 25698,
+               25699, 25700, 25701, 25702, 25904, 25905, 25906, 25907, 25908, 25909, 25910,
+               25911, 25912, 25913, 25953, 25954, 25955, 25956, 25957, 25958, 26160, 26161,
+               26162, 26163, 26164, 26165, 26166, 26167, 26168, 26169, 26209, 26210, 26211,
+               26212, 26213, 26214};
+
+            return hex_char_pairs;
+        }
+
+        inline
+        const uint16_t* get_hex_char_pairs(std::false_type) // little endian
+        {
+            static const uint16_t hex_char_pairs[] = {
+                12336, 12592, 12848, 13104, 13360, 13616, 13872, 14128, 14384, 14640, 24880,
+                25136, 25392, 25648, 25904, 26160, 12337, 12593, 12849, 13105, 13361, 13617,
+                13873, 14129, 14385, 14641, 24881, 25137, 25393, 25649, 25905, 26161, 12338,
+                12594, 12850, 13106, 13362, 13618, 13874, 14130, 14386, 14642, 24882, 25138,
+                25394, 25650, 25906, 26162, 12339, 12595, 12851, 13107, 13363, 13619, 13875,
+                14131, 14387, 14643, 24883, 25139, 25395, 25651, 25907, 26163, 12340, 12596,
+                12852, 13108, 13364, 13620, 13876, 14132, 14388, 14644, 24884, 25140, 25396,
+                25652, 25908, 26164, 12341, 12597, 12853, 13109, 13365, 13621, 13877, 14133,
+                14389, 14645, 24885, 25141, 25397, 25653, 25909, 26165, 12342, 12598, 12854,
+                13110, 13366, 13622, 13878, 14134, 14390, 14646, 24886, 25142, 25398, 25654,
+                25910, 26166, 12343, 12599, 12855, 13111, 13367, 13623, 13879, 14135, 14391,
+                14647, 24887, 25143, 25399, 25655, 25911, 26167, 12344, 12600, 12856, 13112,
+                13368, 13624, 13880, 14136, 14392, 14648, 24888, 25144, 25400, 25656, 25912,
+                26168, 12345, 12601, 12857, 13113, 13369, 13625, 13881, 14137, 14393, 14649,
+                24889, 25145, 25401, 25657, 25913, 26169, 12385, 12641, 12897, 13153, 13409,
+                13665, 13921, 14177, 14433, 14689, 24929, 25185, 25441, 25697, 25953, 26209,
+                12386, 12642, 12898, 13154, 13410, 13666, 13922, 14178, 14434, 14690, 24930,
+                25186, 25442, 25698, 25954, 26210, 12387, 12643, 12899, 13155, 13411, 13667,
+                13923, 14179, 14435, 14691, 24931, 25187, 25443, 25699, 25955, 26211, 12388,
+                12644, 12900, 13156, 13412, 13668, 13924, 14180, 14436, 14692, 24932, 25188,
+                25444, 25700, 25956, 26212, 12389, 12645, 12901, 13157, 13413, 13669, 13925,
+                14181, 14437, 14693, 24933, 25189, 25445, 25701, 25957, 26213, 12390, 12646,
+                12902, 13158, 13414, 13670, 13926, 14182, 14438, 14694, 24934, 25190, 25446,
+                25702, 25958, 26214};
+
+            return hex_char_pairs;
+        }
+
+        inline
+        void init_hex_char_pairs(const oid_t& oid, uint16_t* data)
+        {
+            const uint8_t* bytes = oid.data();
+            const uint16_t* gHexCharPairs = get_hex_char_pairs(std::integral_constant<bool, jsoncons::endian::native == jsoncons::endian::big>());
+
+            data[0] = gHexCharPairs[bytes[0]];
+            data[1] = gHexCharPairs[bytes[1]];
+            data[2] = gHexCharPairs[bytes[2]];
+            data[3] = gHexCharPairs[bytes[3]];
+            data[4] = gHexCharPairs[bytes[4]];
+            data[5] = gHexCharPairs[bytes[5]];
+            data[6] = gHexCharPairs[bytes[6]];
+            data[7] = gHexCharPairs[bytes[7]];
+            data[8] = gHexCharPairs[bytes[8]];
+            data[9] = gHexCharPairs[bytes[9]];
+            data[10] = gHexCharPairs[bytes[10]];
+            data[11] = gHexCharPairs[bytes[11]];
+        }
+
+    } // namsepace detail
+
+    template <typename StringT>
+    inline 
+    void to_string(const oid_t& oid, StringT& s)
+    {
+        s.resize(24);
+        detail::init_hex_char_pairs(oid, reinterpret_cast<uint16_t*>(&s[0]));
+    }
+
+} // namespace bson
+} // namespace jsoncons
+
+#endif