1 files changed, 82 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/utils/dyn_load/dyn_load.cpp b/comm/third_party/botan/src/lib/utils/dyn_load/dyn_load.cpp
new file mode 100644
index 0000000000..b32fe4b3ab
--- /dev/null
+++ b/comm/third_party/botan/src/lib/utils/dyn_load/dyn_load.cpp
@@ -0,0 +1,82 @@
+/*
+* Dynamically Loaded Object
+* (C) 2010 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/dyn_load.h>
+#include <botan/exceptn.h>
+
+#if defined(BOTAN_TARGET_OS_HAS_POSIX1)
+  #include <dlfcn.h>
+#elif defined(BOTAN_TARGET_OS_HAS_WIN32)
+  #define NOMINMAX 1
+  #define _WINSOCKAPI_ // stop windows.h including winsock.h
+  #include <windows.h>
+#endif
+
+namespace Botan {
+
+namespace {
+
+void raise_runtime_loader_exception(const std::string& lib_name,
+                                    const char* msg)
+   {
+   const std::string ex_msg =
+      "Failed to load " + lib_name + ": " +
+      (msg ? msg : "Unknown error");
+
+   throw System_Error(ex_msg, 0);
+   }
+
+}
+
+Dynamically_Loaded_Library::Dynamically_Loaded_Library(
+   const std::string& library) :
+   m_lib_name(library), m_lib(nullptr)
+   {
+#if defined(BOTAN_TARGET_OS_HAS_POSIX1)
+   m_lib = ::dlopen(m_lib_name.c_str(), RTLD_LAZY);
+
+   if(!m_lib)
+      raise_runtime_loader_exception(m_lib_name, ::dlerror());
+
+#elif defined(BOTAN_TARGET_OS_HAS_WIN32)
+   m_lib = ::LoadLibraryA(m_lib_name.c_str());
+
+   if(!m_lib)
+      raise_runtime_loader_exception(m_lib_name, "LoadLibrary failed");
+#endif
+
+   if(!m_lib)
+      raise_runtime_loader_exception(m_lib_name, "Dynamic load not supported");
+   }
+
+Dynamically_Loaded_Library::~Dynamically_Loaded_Library()
+   {
+#if defined(BOTAN_TARGET_OS_HAS_POSIX1)
+   ::dlclose(m_lib);
+#elif defined(BOTAN_TARGET_OS_HAS_WIN32)
+   ::FreeLibrary((HMODULE)m_lib);
+#endif
+   }
+
+void* Dynamically_Loaded_Library::resolve_symbol(const std::string& symbol)
+   {
+   void* addr = nullptr;
+
+#if defined(BOTAN_TARGET_OS_HAS_POSIX1)
+   addr = ::dlsym(m_lib, symbol.c_str());
+#elif defined(BOTAN_TARGET_OS_HAS_WIN32)
+   addr = reinterpret_cast<void*>(::GetProcAddress((HMODULE)m_lib, symbol.c_str()));
+#endif
+
+   if(!addr)
+      throw Invalid_Argument("Failed to resolve symbol " + symbol +
+                             " in " + m_lib_name);
+
+   return addr;
+   }
+
+}