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Diffstat (limited to 'src/regex/regex_test_random.c')
-rw-r--r-- | src/regex/regex_test_random.c | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/src/regex/regex_test_random.c b/src/regex/regex_test_random.c deleted file mode 100644 index 823563d4d..000000000 --- a/src/regex/regex_test_random.c +++ /dev/null | |||
@@ -1,175 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | Copyright (C) 2012 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | /** | ||
21 | * @file src/regex/regex_test_random.c | ||
22 | * @brief functions for creating random regular expressions and strings | ||
23 | * @author Maximilian Szengel | ||
24 | */ | ||
25 | #include "platform.h" | ||
26 | #include "regex_test_lib.h" | ||
27 | #include "gnunet_crypto_lib.h" | ||
28 | #include "regex_internal.h" | ||
29 | |||
30 | |||
31 | /** | ||
32 | * Get a (pseudo) random valid literal for building a regular expression. | ||
33 | * | ||
34 | * @return random valid literal | ||
35 | */ | ||
36 | static char | ||
37 | get_random_literal () | ||
38 | { | ||
39 | uint32_t ridx; | ||
40 | |||
41 | ridx = | ||
42 | GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, | ||
43 | (uint32_t) strlen (ALLOWED_LITERALS)); | ||
44 | |||
45 | return ALLOWED_LITERALS[ridx]; | ||
46 | } | ||
47 | |||
48 | |||
49 | /** | ||
50 | * Generate a (pseudo) random regular expression of length 'rx_length', as well | ||
51 | * as a (optional) string that will be matched by the generated regex. The | ||
52 | * returned regex needs to be freed. | ||
53 | * | ||
54 | * @param rx_length length of the random regex. | ||
55 | * @param matching_str (optional) pointer to a string that will contain a string | ||
56 | * that will be matched by the generated regex, if | ||
57 | * 'matching_str' pointer was not NULL. Make sure you | ||
58 | * allocated at least rx_length+1 bytes for this string. | ||
59 | * | ||
60 | * @return NULL if 'rx_length' is 0, a random regex of length 'rx_length', which | ||
61 | * needs to be freed, otherwise. | ||
62 | */ | ||
63 | char * | ||
64 | REGEX_TEST_generate_random_regex (size_t rx_length, char *matching_str) | ||
65 | { | ||
66 | char *rx; | ||
67 | char *rx_p; | ||
68 | char *matching_strp; | ||
69 | unsigned int i; | ||
70 | unsigned int char_op_switch; | ||
71 | unsigned int last_was_op; | ||
72 | int rx_op; | ||
73 | char current_char; | ||
74 | |||
75 | if (0 == rx_length) | ||
76 | return NULL; | ||
77 | |||
78 | if (NULL != matching_str) | ||
79 | matching_strp = matching_str; | ||
80 | else | ||
81 | matching_strp = NULL; | ||
82 | |||
83 | rx = GNUNET_malloc (rx_length + 1); | ||
84 | rx_p = rx; | ||
85 | current_char = 0; | ||
86 | last_was_op = 1; | ||
87 | |||
88 | for (i = 0; i < rx_length; i++) | ||
89 | { | ||
90 | char_op_switch = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 2); | ||
91 | |||
92 | if ((0 == char_op_switch) && ! last_was_op) | ||
93 | { | ||
94 | last_was_op = 1; | ||
95 | rx_op = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 4); | ||
96 | |||
97 | switch (rx_op) | ||
98 | { | ||
99 | case 0: | ||
100 | current_char = '+'; | ||
101 | break; | ||
102 | |||
103 | case 1: | ||
104 | current_char = '*'; | ||
105 | break; | ||
106 | |||
107 | case 2: | ||
108 | current_char = '?'; | ||
109 | break; | ||
110 | |||
111 | case 3: | ||
112 | if (i < rx_length - 1) /* '|' cannot be at the end */ | ||
113 | current_char = '|'; | ||
114 | else | ||
115 | current_char = get_random_literal (); | ||
116 | break; | ||
117 | } | ||
118 | } | ||
119 | else | ||
120 | { | ||
121 | current_char = get_random_literal (); | ||
122 | last_was_op = 0; | ||
123 | } | ||
124 | |||
125 | if ((NULL != matching_strp) && | ||
126 | ((current_char != '+') && (current_char != '*') && (current_char != | ||
127 | '?') && | ||
128 | (current_char != '|') )) | ||
129 | { | ||
130 | *matching_strp = current_char; | ||
131 | matching_strp++; | ||
132 | } | ||
133 | |||
134 | *rx_p = current_char; | ||
135 | rx_p++; | ||
136 | } | ||
137 | *rx_p = '\0'; | ||
138 | if (NULL != matching_strp) | ||
139 | *matching_strp = '\0'; | ||
140 | |||
141 | return rx; | ||
142 | } | ||
143 | |||
144 | |||
145 | /** | ||
146 | * Generate a random string of maximum length 'max_len' that only contains literals allowed | ||
147 | * in a regular expression. The string might be 0 chars long but is garantueed | ||
148 | * to be shorter or equal to 'max_len'. | ||
149 | * | ||
150 | * @param max_len maximum length of the string that should be generated. | ||
151 | * | ||
152 | * @return random string that needs to be freed. | ||
153 | */ | ||
154 | char * | ||
155 | REGEX_TEST_generate_random_string (size_t max_len) | ||
156 | { | ||
157 | unsigned int i; | ||
158 | char *str; | ||
159 | size_t len; | ||
160 | |||
161 | if (1 > max_len) | ||
162 | return GNUNET_strdup (""); | ||
163 | |||
164 | len = (size_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, max_len); | ||
165 | str = GNUNET_malloc (len + 1); | ||
166 | |||
167 | for (i = 0; i < len; i++) | ||
168 | { | ||
169 | str[i] = get_random_literal (); | ||
170 | } | ||
171 | |||
172 | str[i] = '\0'; | ||
173 | |||
174 | return str; | ||
175 | } | ||