os: DLL abstraction.

diff --git a/common/os_dl.hpp b/common/os_dl.hpp
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+++ b/common/os_dl.hpp
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+/**************************************************************************
+ *
+ * Copyright 2012 Jose Fonseca
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/*
+ * Dynamic library linking abstraction.
+ */
+
+#ifndef _OS_DL_HPP_
+#define _OS_DL_HPP_
+
+
+#if defined(_WIN32)
+#include <windows.h>
+#else
+#include <dlfcn.h>
+#endif
+
+
+#if defined(_WIN32)
+#define OS_LIBRARY_EXTENSION ".dll"
+#elif defined(__APPLE__)
+#define OS_LIBRARY_EXTENSION ".dylib"
+#else
+#define OS_LIBRARY_EXTENSION ".so"
+#endif
+
+
+namespace os {
+
+    // TODO: Wrap in a class
+#if defined(_WIN32)
+    typedef HMODULE Library;
+#else
+    typedef void * Library;
+#endif
+
+    inline Library
+    openLibrary(const char *filename) {
+#if defined(_WIN32)
+        return LoadLibraryA(filename);
+#else
+        return dlopen(filename, RTLD_LOCAL | RTLD_LAZY);
+#endif
+    }
+
+    inline void *
+    getLibrarySymbol(Library library, const char *symbol) {
+#if defined(_WIN32)
+        return (void *)GetProcAddress(library, symbol);
+#else
+        return dlsym(library, symbol);
+#endif
+    }
+
+    inline void
+    closeLibrary(Library library) {
+#if defined(_WIN32)
+        FreeLibrary(library);
+#else
+        dlclose(library);
+#endif
+    }
+
+
+} /* namespace os */
+
+#endif /* _OS_DL_HPP_ */