/*

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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")

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*

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* This Source Code Form is subject to the terms of the Mozilla Public

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* License, v. 2.0. If a copy of the MPL was not distributed with this

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* file, you can obtain one at https://mozilla.org/MPL/2.0/.

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*

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* See the COPYRIGHT file distributed with this work for additional

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* information regarding copyright ownership.

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*/

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#ifndef ISC_MAGIC_H

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#define ISC_MAGIC_H 1

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#include <isc/likely.h>

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/*! \file isc/magic.h */

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typedef struct {

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unsigned int magic;

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} isc__magic_t;

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/*%

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* To use this macro the magic number MUST be the first thing in the

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* structure, and MUST be of type "unsigned int".

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* The intent of this is to allow magic numbers to be checked even though

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* the object is otherwise opaque.

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*/

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#define ISC_MAGIC_VALID(a,b) (ISC_LIKELY((a) != NULL) && \

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ISC_LIKELY(((const isc__magic_t *)(a))->magic == (b)))

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#define ISC_MAGIC(a, b, c, d) ((a) << 24 | (b) << 16 | (c) << 8 | (d))

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#endif /* ISC_MAGIC_H */

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