1 /*
2 * Copyright (C) 2021 Alyssa Rosenzweig <alyssa@rosenzweig.io>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #ifndef __HEXDUMP_H
25 #define __HEXDUMP_H
26
27 static void
hexdump(FILE * fp,const uint8_t * hex,size_t cnt,bool with_strings)28 hexdump(FILE *fp, const uint8_t *hex, size_t cnt, bool with_strings)
29 {
30 for (unsigned i = 0; i < cnt; ++i) {
31 if ((i & 0xF) == 0)
32 fprintf(fp, "%06X ", i);
33
34 uint8_t v = hex[i];
35
36 if (v == 0 && (i & 0xF) == 0) {
37 /* Check if we're starting an aligned run of zeroes */
38 unsigned zero_count = 0;
39
40 for (unsigned j = i; j < cnt; ++j) {
41 if (hex[j] == 0)
42 zero_count++;
43 else
44 break;
45 }
46
47 if (zero_count >= 32) {
48 fprintf(fp, "*\n");
49 i += (zero_count & ~0xF) - 1;
50 continue;
51 }
52 }
53
54 fprintf(fp, "%02X ", hex[i]);
55 if ((i & 0xF) == 0xF && with_strings) {
56 fprintf(fp, " | ");
57 for (unsigned j = i & ~0xF; j <= i; ++j) {
58 uint8_t c = hex[j];
59 fputc((c < 32 || c > 128) ? '.' : c, fp);
60 }
61 }
62
63 if ((i & 0xF) == 0xF)
64 fprintf(fp, "\n");
65 }
66
67 fprintf(fp, "\n");
68 }
69
70 #endif
71