Java example source code file (safe_alloc.h)

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Java - Java tags/keywords

safe_to_alloc_2, safe_to_alloc_3

The safe_alloc.h Java example source code

/*
 * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#ifndef __SAFE_ALLOC_H__
#define __SAFE_ALLOC_H__

#include "j2d_md.h"

/*
 * Macroses defined below are wrappers for alloc functions
 * that perform buffer size calculation with integer overflow
 * check.
 */
#define SAFE_TO_ALLOC_2(c, sz)                                             \
    (((c) > 0) && ((sz) > 0) &&                                            \
     ((0xffffffffu / ((juint)(c))) > ((juint)(sz))))

#define SAFE_TO_ALLOC_3(w, h, sz)                                          \
    (((w) > 0) && ((h) > 0) && ((sz) > 0) &&                               \
     (((0xffffffffu / ((juint)(w))) / ((juint)(h))) > ((juint)(sz))))

#endif // __SAFE_ALLOC_H__