1 | /* |
2 | * Copyright (c) 2015-2017, 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 | /** \file |
30 | * \brief Shufti acceleration: compile code. |
31 | */ |
32 | |
33 | #ifndef SHUFTI_COMPILE_H |
34 | #define SHUFTI_COMPILE_H |
35 | |
36 | #include "ue2common.h" |
37 | #include "util/charreach.h" |
38 | #include "util/flat_containers.h" |
39 | |
40 | #include <utility> |
41 | |
42 | namespace ue2 { |
43 | |
44 | /** \brief Single-byte variant. |
45 | * |
46 | * Returns -1 if unable to construct masks, otherwise returns number of bits |
47 | * used in the mask. |
48 | * |
49 | * Note: always able to construct masks for 8 or fewer characters. |
50 | */ |
51 | int shuftiBuildMasks(const CharReach &chars, u8 *lo, u8 *hi); |
52 | |
53 | /** \brief Double-byte variant |
54 | * |
55 | * Returns false if we are unable to build the masks (too many buckets required) |
56 | */ |
57 | bool shuftiBuildDoubleMasks(const CharReach &onechar, |
58 | const flat_set<std::pair<u8, u8>> &twochar, |
59 | u8 *lo1, u8 *hi1, u8 *lo2, u8 *hi2); |
60 | |
61 | #ifdef DUMP_SUPPORT |
62 | |
63 | /** |
64 | * \brief Dump code: returns a CharReach with the reach that would match this |
65 | * shufti. |
66 | */ |
67 | CharReach shufti2cr(const u8 *lo, const u8 *hi); |
68 | |
69 | #endif // DUMP_SUPPORT |
70 | |
71 | } // namespace ue2 |
72 | |
73 | #endif // SHUFTI_COMPILE_H |
74 | |