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diff --git a/src/yajlpp/json_ptr.hh b/src/yajlpp/json_ptr.hh
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+/**
+ * Copyright (c) 2014-2019, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TIMOTHY STACK AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file json_ptr.hh
+ */
+
+#ifndef json_ptr_hh
+#define json_ptr_hh
+
+#include <string>
+#include <vector>
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "base/auto_mem.hh"
+#include "yajl/api/yajl_parse.h"
+#include "yajl/api/yajl_tree.h"
+
+class json_ptr_walk {
+public:
+    const static yajl_callbacks callbacks;
+
+    json_ptr_walk()
+    {
+        this->jpw_handle = yajl_alloc(&callbacks, nullptr, this);
+    }
+
+    yajl_status parse(const char* buffer, ssize_t len);
+
+    yajl_status complete_parse();
+
+    void update_error_msg(yajl_status status, const char* buffer, ssize_t len);
+
+    void clear() { this->jpw_values.clear(); }
+
+    void inc_array_index()
+    {
+        if (!this->jpw_array_indexes.empty()
+            && this->jpw_array_indexes.back() != -1) {
+            this->jpw_array_indexes.back() += 1;
+        }
+    }
+
+    std::string current_ptr();
+
+    struct walk_triple {
+        walk_triple(std::string ptr, yajl_type type, std::string value)
+            : wt_ptr(std::move(ptr)), wt_type(type), wt_value(std::move(value))
+        {
+        }
+
+        std::string wt_ptr;
+        yajl_type wt_type;
+        std::string wt_value;
+    };
+
+    using walk_list_t = std::vector<walk_triple>;
+
+    auto_mem<yajl_handle_t> jpw_handle{yajl_free};
+    std::string jpw_error_msg;
+    walk_list_t jpw_values;
+    std::vector<std::string> jpw_keys;
+    std::vector<int32_t> jpw_array_indexes;
+    size_t jpw_max_ptr_len{0};
+};
+
+class json_ptr {
+public:
+    enum class match_state_t {
+        DONE,
+        VALUE,
+        ERR_INVALID_TYPE,
+        ERR_NO_SLASH,
+        ERR_INVALID_ESCAPE,
+        ERR_INVALID_INDEX,
+    };
+
+    static size_t encode(char* dst,
+                         size_t dst_len,
+                         const char* src,
+                         size_t src_len = -1);
+
+    static size_t decode(char* dst, const char* src, ssize_t src_len = -1);
+
+    json_ptr(const char* value) : jp_value(value), jp_pos(value) {}
+
+    bool expect_map(int32_t& depth, int32_t& index);
+
+    bool at_key(int32_t depth, const char* component, ssize_t len = -1);
+
+    void exit_container(int32_t& depth, int32_t& index);
+
+    bool expect_array(int32_t& depth, int32_t& index);
+
+    bool at_index(int32_t& depth, int32_t& index, bool primitive = true);
+
+    bool reached_end() const { return this->jp_pos[0] == '\0'; }
+
+    std::string error_msg() const;
+
+    const char* jp_value;
+    const char* jp_pos;
+    int32_t jp_depth{0};
+    int32_t jp_array_index{-1};
+    match_state_t jp_state{match_state_t::VALUE};
+};
+
+#endif