1/*
2 * Copyright (c) 2015, Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * * Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of Intel Corporation nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef ROSE_BUILD_WIDTH_H
30#define ROSE_BUILD_WIDTH_H
31
32#include "rose_build_impl.h"
33#include "ue2common.h"
34
35namespace ue2 {
36
37class RoseBuildImpl;
38
39/* returns a lower bound on the minimum number of bytes required for match to be
40 * raised up to the user which requires the given literal table to be used
41 *
42 * returns ROSE_BOUND_INF if the table can never produce matches */
43u32 findMinWidth(const RoseBuildImpl &tbi, enum rose_literal_table table);
44
45/* returns an upper bound on the maximum length of a buffer that can result in
46 * matches. If there are any patterns which are not bianchored (start and end
47 * anchored), then there is no such limit and ROSE_BOUND_INF is returned.
48 */
49u32 findMaxBAWidth(const RoseBuildImpl &tbi);
50
51/* returns an upper bound on the maximum length of a buffer that can result in
52 * matches and requires that the given table to be used. If there are any
53 * patterns which are not bianchored (start and end anchored), then there is no
54 * such limit and ROSE_BOUND_INF is returned.
55 */
56u32 findMaxBAWidth(const RoseBuildImpl &tbi, enum rose_literal_table table);
57
58/**
59 * Note: there is no function for determining the min width of the whole rose
60 * as this is more easily done by the NG layer which has access to the full
61 * nfagraphs before they are chopped into little pieces.
62 */
63
64} // namespace ue2
65
66#endif
67