Security-57740.1.18.tar.gz

[apple/security.git] / OSX / libsecurity_utilities / lib / casts.h

diff --git a/OSX/libsecurity_utilities/lib/casts.h b/OSX/libsecurity_utilities/lib/casts.h
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+/*
+ * Copyright (c) 2016 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#ifndef casts_h
+#define casts_h
+
+#include <stdexcept>
+#include <security_utilities/debugging.h>
+#include <syslog.h>
+
+template<typename TSource, typename TResult>
+static inline TResult int_cast(TSource value) {
+    // TODO: if we're using C++11, we should do some static_asserts on the signedness of these types
+    TResult result = static_cast<TResult>(value);
+
+    if (static_cast<TSource>(result) != value) {
+#ifndef NDEBUG
+        syslog(LOG_ERR, "%s: casted value out of range", __PRETTY_FUNCTION__);
+#endif
+        secnotice("int_cast", "casted value out of range");
+        throw std::out_of_range("int_cast: casted value out of range");
+    }
+    return result;
+}
+
+#endif /* casts_h */