1 files changed, 91 insertions, 0 deletions
diff --git a/src/lib/libstate/global_state.cpp b/src/lib/libstate/global_state.cpp
new file mode 100644
index 000000000..6a846d9b0
--- /dev/null
+++ b/src/lib/libstate/global_state.cpp
@@ -0,0 +1,91 @@
+/*
+* Global State Management
+* (C) 2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/global_state.h>
+#include <botan/libstate.h>
+
+namespace Botan {
+
+/*
+* @todo There should probably be a lock to avoid racy manipulation
+* of the state among different threads
+*/
+
+namespace Global_State_Management {
+
+/*
+* Botan's global state
+*/
+namespace {
+
+Library_State* global_lib_state = nullptr;
+
+}
+
+/*
+* Access the global state object
+*/
+Library_State& global_state()
+   {
+   /* Lazy initialization. Botan still needs to be deinitialized later
+      on or memory might leak.
+   */
+   if(!global_lib_state)
+      {
+      global_lib_state = new Library_State;
+      global_lib_state->initialize();
+      }
+
+   return (*global_lib_state);
+   }
+
+/*
+* Set a new global state object
+*/
+void set_global_state(Library_State* new_state)
+   {
+   delete swap_global_state(new_state);
+   }
+
+/*
+* Set a new global state object unless one already existed
+*/
+bool set_global_state_unless_set(Library_State* new_state)
+   {
+   if(global_lib_state)
+      {
+      delete new_state;
+      return false;
+      }
+   else
+      {
+      delete swap_global_state(new_state);
+      return true;
+      }
+   }
+
+/*
+* Swap two global state objects
+*/
+Library_State* swap_global_state(Library_State* new_state)
+   {
+   Library_State* old_state = global_lib_state;
+   global_lib_state = new_state;
+   return old_state;
+   }
+
+/*
+* Query if library is initialized
+*/
+bool global_state_exists()
+   {
+   return (global_lib_state != nullptr);
+   }
+
+}
+
+}