pollymc/depends/pack200/src/utils.h

/*
 * Copyright (c) 2001, 2008, 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.
 */

// Definitions of our util functions

#include <stdexcept>

void *must_malloc(size_t size);

// overflow management
#define OVERFLOW ((size_t) - 1)
#define PSIZE_MAX (OVERFLOW / 2) /* normal size limit */

inline size_t scale_size(size_t size, size_t scale)
{
	return (size > PSIZE_MAX / scale) ? OVERFLOW : size * scale;
}

inline size_t add_size(size_t size1, size_t size2)
{
	return ((size1 | size2 | (size1 + size2)) > PSIZE_MAX) ? OVERFLOW : size1 + size2;
}

inline size_t add_size(size_t size1, size_t size2, int size3)
{
	return add_size(add_size(size1, size2), size3);
}

struct unpacker;
/// This throws an exception!
extern void unpack_abort(const char *msg = nullptr);