File: debase64.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 # debase64 [options...] [filename...] 27 # 28 # Decode base64-encoded streams: these include data-URIs, which start with a 29 # MIME declaration before their base64 payload starts. 30 # 31 # The only options show this help message, via any of `-h`, `--h`, `-help`, 32 # or `--help`. 33 34 35 case "$1" in 36 -h|--h|-help|--help) 37 awk '/^# +debase64 /, /^$/ { gsub(/^# ?/, ""); print }' "$0" 38 exit 0 39 ;; 40 esac 41 42 if [ $# -gt 1 ]; then 43 printf "\e[31mmultiple files not supported\e[0m\n" > /dev/stderr 44 exit 1 45 fi 46 47 sed -E 's-^data:.{0,50};base64,--' "${1:--}" | base64 -d