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 27static void 28hexdump(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