File: nh.sh 1 #!/bin/sh 2 3 # The MIT License (MIT) 4 # 5 # Copyright © 2020-2025 pacman64 6 # 7 # Permission is hereby granted, free of charge, to any person obtaining a copy 8 # of this software and associated documentation files (the “Software”), to deal 9 # in the Software without restriction, including without limitation the rights 10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 # copies of the Software, and to permit persons to whom the Software is 12 # furnished to do so, subject to the following conditions: 13 # 14 # The above copyright notice and this permission notice shall be included in 15 # all copies or substantial portions of the Software. 16 # 17 # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 23 # SOFTWARE. 24 25 26 # nh [options...] [files...] 27 # 28 # 29 # Nice Hexadecimals is a byte-viewer which shows bytes as base-16 values, 30 # using various ANSI styles to color-code output. 31 # 32 # Output lines end with a panel showing all ASCII sequences detected along. 33 # 34 # Options, where leading double-dashes are also allowed: 35 # 36 # -h show this help message 37 # -help same as -h 38 39 40 case "$1" in 41 -h|--h|-help|--help) 42 awk '/^# +nh /, /^$/ { gsub(/^# ?/, ""); print }' "$0" 43 exit 0 44 ;; 45 esac 46 47 # if [ $# -gt 1 ]; then 48 # printf "\e[31mmultiple inputs not allowed\e[0m\n" > /dev/stderr 49 # exit 1 50 # fi 51 52 dashes=0 53 for name in "${@:--}"; do 54 if [ "${name}" = "-" ]; then 55 dashes="$((dashes + 1))" 56 fi 57 if [ "${dashes}" -gt 1 ]; then 58 printf "\e[31mcan't use dash/stdin multiple times\e[0m\n" > /dev/stderr 59 exit 1 60 fi 61 done 62 63 first=1 64 65 for name in "${@:--}"; do 66 od -A none -t u1 --width=16 "${name}" | awk ' 67 NR > 1 { 68 for (i = 1; i <= pnf; i++) printf " %s", p[i] 69 for (i = 1; i <= pnf; i++) printf " %s", p[i] 70 for (i = 1; i <= NF; i++) printf " %s", $i 71 printf "\n" 72 } 73 74 { 75 pnf = NF 76 for (i = 1; i <= NF; i++) p[i] = $i 77 } 78 79 END { 80 if (NR > 0) { 81 for (i = 1; i <= pnf; i++) printf " %s", p[i] 82 for (i = 1; i <= pnf; i++) printf " %s", p[i] 83 if (pnf > 0) printf "\n" 84 } 85 }' | awk -v first="${first}" -v name="${name}" ' 86 BEGIN { 87 vis1 = " !\"#$%& ()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ" 88 vis2 = "[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~" 89 split(vis1 vis2, visible, "") 90 l = length(visible) 91 for (i = 1; i < l; i++) a[i + 32 - 1] = visible[i] 92 a[39] = "'"'"'" 93 a[126] = "~" 94 95 if (name == "-") name = "<stdin>" 96 if (!first) printf "\n\n" 97 printf "• %s\n\n", name; fflush() 98 } 99 100 function show_offset(n, s, len, lead, alt) { 101 s = sprintf("%8d", n) 102 103 while (match(s, /[0-9]{4,}/)) { 104 len = RLENGTH 105 lead = len % 3 106 alt = lead > 0 107 108 printf "%s", substr(s, 1, RSTART + lead - 1) 109 s = substr(s, RSTART + lead) 110 len -= lead 111 112 while (len > 0) { 113 if (alt == 1) { 114 printf "\x1b[38;5;248m%s\x1b[0m", substr(s, 1, 3) 115 } else { 116 printf "%s", substr(s, 1, 3) 117 } 118 119 alt = 1 - alt 120 s = substr(s, 4) 121 len -= 3 122 } 123 } 124 125 printf "%s", s 126 } 127 128 function show_byte(n) { 129 if (n == 0) { 130 printf "\x1b[38;5;111m%02x ", n 131 return 132 } 133 134 if (n == 255) { 135 printf "\x1b[38;5;209m%x ", n 136 return 137 } 138 139 if (32 <= n && n <= 126) { 140 printf "\x1b[38;5;72m%x\x1b[0m\x1b[48;5;254m%s", n, a[n] 141 return 142 } 143 144 printf "\x1b[38;5;246m%02x ", n 145 } 146 147 NR % 5 == 1 && NR > 1 { 148 printf "%8s ", "" 149 printf " · · · ·\n" 150 } 151 152 { 153 # printf "%8d \x1b[48;5;254m", offset 154 show_offset(offset) 155 printf " \x1b[48;5;254m" 156 157 for (i = 1; i <= NF; i++) { 158 if (i > 16) break 159 show_byte($i) 160 } 161 162 printf "\x1b[0m" 163 164 runs = 0 165 asciirun = 0 166 short = (NF < 2 * 16) 167 pad = short ? sprintf("%*s", 3 * (NF - 16) + 2, "") : " " 168 169 for (i = short ? NF / 2 : 16 + 1; i <= NF; i++) { 170 n = $i 171 172 if (32 < n && n <= 126) { 173 if (!asciirun) { 174 asciirun = 1 175 runs++ 176 printf (runs > 1) ? " " : pad 177 } 178 179 printf "%s", a[n] 180 continue 181 } 182 183 asciirun = 0 184 } 185 186 printf "\n"; fflush() 187 188 offset += 16 189 }' 190 191 first=0 192 done