Merge pull request #178 from alliedmodders/fs-redux

Simplify filesystem natives.

core/logic/handle_helpers.h

@@ -0,0 +1,95 @@
+/**
+ * vim: set ts=4 sw=4 tw=99 noet :
+ * =============================================================================
+ * SourceMod
+ * Copyright (C) 2004-2014 AlliedModders LLC.  All rights reserved.
+ * =============================================================================
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, version 3.0, as published by the
+ * Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As a special exception, AlliedModders LLC gives you permission to link the
+ * code of this program (as well as its derivative works) to "Half-Life 2," the
+ * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
+ * by the Valve Corporation.  You must obey the GNU General Public License in
+ * all respects for all other code used.  Additionally, AlliedModders LLC grants
+ * this exception to all derivative works.  AlliedModders LLC defines further
+ * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
+ * or <http://www.sourcemod.net/license.php>.
+ *
+ * Version: $Id$
+ */
+#ifndef _include_sourcemod_handle_helpers_h_
+#define _include_sourcemod_handle_helpers_h_
+
+#include "common_logic.h"
+
+// T must be a pointer type.
+template <typename T>
+class OpenHandle
+{
+public:
+	OpenHandle()
+	: t_(),
+	  error_(HandleError_None)
+	{}
+	explicit OpenHandle(T *t)
+	: t_(t),
+	  error_(HandleError_None)
+	{}
+	OpenHandle(const OpenHandle &other)
+	: t_(other.t_),
+	  error_(other.error_)
+	{}
+	OpenHandle(IPluginContext *cx, Handle_t handle, HandleType_t type)
+	: t_(NULL)
+	{
+		HandleSecurity sec(cx->GetIdentity(), g_pCoreIdent);
+		error_ = handlesys->ReadHandle(handle, type, &sec, (void **)&t_);
+		if (error_ != HandleError_None)
+			cx->ThrowNativeError("invalid handle %x (error: %d)", handle, error_);
+	}
+
+	bool Ok() const {
+		return t_ && error_ == HandleError_None;
+	}
+
+	operator T *() const {
+		assert(Ok());
+		return t_;
+	}
+	T *operator *() const {
+		assert(Ok());
+		return t_;
+	}
+	T *operator ->() const {
+		assert(Ok());
+		return t_;
+	}
+
+	OpenHandle &operator =(T *t) {
+		t_ = t;
+		error_ = HandleError_None;
+		return *this;
+	}
+	OpenHandle &operator =(const OpenHandle &other) {
+		t_ = other.t_;
+		error_ = other.error_;
+		return *this;
+	}
+
+private:
+	T *t_;
+	HandleError error_;
+};
+
+#endif // _include_sourcemod_handle_helpers_h_