1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/* generates constant table for metadata.c */
#include <stdio.h>
#include <string.h>
static unsigned char legal_bits[256 / 8];
static void legal(int x) {
int byte = x / 8;
int bit = x % 8;
/* NB: the following integer arithmetic operation needs to be in its
* expanded form due to the "integral promotion" performed (see section
* 3.2.1.1 of the C89 draft standard). A cast to the smaller container type
* is then required to avoid the compiler warning */
legal_bits[byte] =
(unsigned char)((legal_bits[byte] | (unsigned char)(1 << bit)));
}
static void dump(void) {
int i;
printf("static const uint8_t legal_header_bits[256/8] = ");
for (i = 0; i < 256 / 8; i++)
printf("%c 0x%02x", i ? ',' : '{', legal_bits[i]);
printf(" };\n");
}
static void clear(void) { memset(legal_bits, 0, sizeof(legal_bits)); }
int main(void) {
int i;
clear();
for (i = 'a'; i <= 'z'; i++) legal(i);
for (i = '0'; i <= '9'; i++) legal(i);
legal('-');
legal('_');
legal('.');
dump();
clear();
for (i = 32; i <= 126; i++) {
legal(i);
}
dump();
return 0;
}
|
