jdk/src/share/native/sun/awt/medialib/safe_alloc.h
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Tue, 28 Dec 2010 15:53:50 -0800
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/*
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 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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#ifndef __SAFE_ALLOC_H__
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#define __SAFE_ALLOC_H__
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#include "j2d_md.h"
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/*
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 * Macroses defined below are wrappers for alloc functions
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 * that perform buffer size calculation with integer overflow
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 * check.
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 */
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#define SAFE_TO_ALLOC_2(c, sz)                                             \
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    (((c) > 0) && ((sz) > 0) &&                                            \
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     ((0xffffffffu / ((juint)(c))) > ((juint)(sz))))
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#define SAFE_TO_ALLOC_3(w, h, sz)                                          \
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    (((w) > 0) && ((h) > 0) && ((sz) > 0) &&                               \
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     (((0xffffffffu / ((juint)(w))) / ((juint)(h))) > ((juint)(sz))))
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#endif // __SAFE_ALLOC_H__