Add API to provide access to parsed OpenPOWER VPD

This change adds the Store class, which serves as a store for parsed
OpenPOWER VPD, as well as provides access to the VPD specified by
a record:keyword combination.

Change-Id: Ie9efe5825a3e799d78b59333c06955b0214a6823
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>

2 files changed, 75 insertions, 0 deletions

diff --git a/store.hpp b/store.hpp
new file mode 100644
index 0000000..e9cbeba
--- /dev/null
+++ b/store.hpp
@@ -0,0 +1,57 @@
+#pragma once
+
+#include <string>
+#include <unordered_map>
+#include "defines.hpp"
+#include "types.hpp"
+
+namespace openpower
+{
+namespace vpd
+{
+
+/** @brief Parsed VPD is represented as a dictionary of records, where
+ *         each record in itself is a dictionary of keywords */
+using Parsed =
+    std::unordered_map<std::string,
+        std::unordered_map<std::string, std::string>>;
+
+/** @class Store
+ *  @brief Store for parsed OpenPOWER VPD
+ *
+ *  A Store object stores parsed OpenPOWER VPD, and provides access
+ *  to the VPD, specified by record and keyword. Parsed VPD is typically
+ *  provided by the Parser class.
+ */
+class Store final
+{
+    public:
+        Store() = delete;
+        Store(const Store&) = delete;
+        Store& operator=(const Store&) = delete;
+        Store(Store&&) = default;
+        Store& operator=(Store&&) = default;
+        ~Store() = default;
+
+        /** @brief Construct a Store
+         *
+         *  @param[in] vpdBuffer - A parsed VPD object
+         */
+        explicit Store(Parsed&& vpdBuffer): vpd(std::move(vpdBuffer)) {}
+
+        /** @brief Retrives VPD from Store
+         *
+         *  @tparam R - VPD record
+         *  @tparam K - VPD keyword
+         *  @returns VPD stored in input record:keyword
+         */
+        template<Record R, record::Keyword K>
+        inline const std::string& get() const;
+
+    private:
+        /** @brief The store for parsed VPD */
+        Parsed vpd;
+};
+
+} // namespace vpd
+} // namespace openpower
diff --git a/types.hpp b/types.hpp
new file mode 100644
index 0000000..7e56eb4
--- /dev/null
+++ b/types.hpp
@@ -0,0 +1,18 @@
+#pragma once
+
+#include <climits>
+#include <vector>
+
+namespace openpower
+{
+namespace vpd
+{
+
+/** @brief The OpenPOWER VPD, in binary, is specified as a
+ *         sequence of characters */
+static_assert((8 == CHAR_BIT), "A byte is not 8 bits!");
+using Byte = uint8_t;
+using Binary = std::vector<Byte>;
+
+} // namespace vpd
+} // namespace openpower