1 /* Copyright © 2023 Valve Corporation
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a
4 * copy of this software and associated documentation files (the "Software"),
5 * to deal in the Software without restriction, including without limitation
6 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
7 * and/or sell copies of the Software, and to permit persons to whom the
8 * Software is furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice (including the next
11 * paragraph) shall be included in all copies or substantial portions of the
12 * Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 * DEALINGS IN THE SOFTWARE.
21 */
22
23 #ifndef UTIL_HEX_H
24 #define UTIL_HEX_H
25
26 #ifdef __cplusplus
27 extern "C" {
28 #endif
29
30 /*
31 * Convert a binary buffer of length `len` to a hexadecimal string of length
32 * `len * 2 + 1` (including NUL terminator).
33 */
mesa_bytes_to_hex(char * buf,const unsigned char * binary,unsigned len)34 static inline char *mesa_bytes_to_hex(char *buf, const unsigned char *binary,
35 unsigned len) {
36 static const char hex_digits[] = "0123456789abcdef";
37 unsigned i;
38
39 for (i = 0; i < len * 2; i += 2) {
40 buf[i] = hex_digits[binary[i >> 1] >> 4];
41 buf[i + 1] = hex_digits[binary[i >> 1] & 0x0f];
42 }
43 buf[i] = '\0';
44
45 return buf;
46 }
47
_mesa_hex_to_int(unsigned char c)48 static inline int _mesa_hex_to_int(unsigned char c)
49 {
50 return c - (c >= 'a' ? 'a' - 10 : '0');
51 }
52
53 /*
54 * Read `len` pairs of hexadecimal digits from `hex` and write the values to
55 * `binary` as `len` bytes.
56 * Hexadecimals must be lower case.
57 */
mesa_hex_to_bytes(unsigned char * buf,const char * hex,unsigned len)58 static inline void mesa_hex_to_bytes(unsigned char *buf, const char *hex,
59 unsigned len)
60 {
61 for (unsigned i = 0; i < len; i++) {
62 int hi = _mesa_hex_to_int(hex[i * 2]);
63 int lo = _mesa_hex_to_int(hex[i * 2 + 1]);
64
65 buf[i] = (hi << 4) | lo;
66 }
67 }
68
69 #ifdef __cplusplus
70 }
71 #endif
72
73 #endif
74