1 /*
2 *
3 * Copyright 2015 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 /* generates constant table for metadata.cc */
20
21 #include <stdio.h>
22 #include <string.h>
23
24 static unsigned char legal_bits[256 / 8];
25
legal(int x)26 static void legal(int x) {
27 int byte = x / 8;
28 int bit = x % 8;
29 /* NB: the following integer arithmetic operation needs to be in its
30 * expanded form due to the "integral promotion" performed (see section
31 * 3.2.1.1 of the C89 draft standard). A cast to the smaller container type
32 * is then required to avoid the compiler warning */
33 legal_bits[byte] =
34 (unsigned char)((legal_bits[byte] | (unsigned char)(1 << bit)));
35 }
36
dump(const char * name)37 static void dump(const char *name) {
38 int i;
39
40 printf("const uint8_t %s[256/8] = ", name);
41 for (i = 0; i < 256 / 8; i++)
42 printf("%c 0x%02x", i ? ',' : '{', legal_bits[i]);
43 printf(" };\n");
44 }
45
clear(void)46 static void clear(void) { memset(legal_bits, 0, sizeof(legal_bits)); }
47
main(void)48 int main(void) {
49 int i;
50
51 clear();
52 for (i = 'a'; i <= 'z'; i++) legal(i);
53 for (i = 'A'; i <= 'Z'; i++) legal(i);
54 for (i = '0'; i <= '9'; i++) legal(i);
55 legal('-');
56 legal('_');
57 legal('.');
58 legal('~');
59 dump("grpc_url_percent_encoding_unreserved_bytes");
60
61 clear();
62 for (i = 32; i <= 126; i++) {
63 if (i == '%') continue;
64 legal(i);
65 }
66 dump("grpc_compatible_percent_encoding_unreserved_bytes");
67
68 return 0;
69 }
70