use compress with base64|gzip

README

@@ -1,6 +1,5 @@
 *shasumscript* is a tool to generate a self-checksum-script.
 
-
 Usage
 
 	shasumscript script.sh

shasumscript

@@ -13,6 +13,8 @@ err() { error "$*"; exit 1; }
 usage() { echo "Usage: $(basename "$0") [-V | -h] <file>";echo "  -V: Show version"; echo "  -h: Show this help"; }
 err_usage() { error "$*"; usage; exit 1; }
 step () { err="$?"; c=32; t=OK; test "$err" = 0 || { c=31; t=FAILED; }; printf "* %s \e[%dm%s\e[0m\n" "$*" "$c" "$t"; }
+compress() { cat | gzip -9 | base64; }
+	
 
 VERSION="0.0.1"
 if test "$1" = '-V'; then echo "shasumscript v$VERSION"; exit; fi
@@ -25,6 +27,9 @@ test -e "$file" || err "File not found: $file"
 sha="$(shasum -a 256 "$file" | cut -d' ' -f1)" || err "Failed to calculate SHA256 checksum"
 step "Checksum"
 
+bin=$(cat "$file" | compress)
+step "Compress"
+
 newfile="${file}_sha256"
 
 cat <<EOT > "$newfile"
@@ -32,8 +37,7 @@ cat <<EOT > "$newfile"
 # script generated by shasumscript at $(date)
 #
 # This script self-checkssum it's content and exit on error
-# The real script can be found after the separator:
-# $sha
+# The real script can be found after line 22.
 #
 # License: GNU GPL3
 # Author: Patrick Cao Huu Thien
@@ -41,22 +45,19 @@ cat <<EOT > "$newfile"
 tmpexe="\$(mktemp)"
 trap 'rm -f "\$tmpexe"' EXIT
 
-cat "\$0" | sed -n '/^${sha}/,\$p' | tail -n +2 > "\$tmpexe"
+cat "\$0" | sed '1,21d' | base64 -d 2>/dev/null| gunzip 2>/dev/null > "\$tmpexe"
 test "\$(shasum -a 256 "\$tmpexe" | cut -d' ' -f1)" = "$sha" || {
 	echo "Checksum mismatch!" >&2
 	exit 1
 }
 
-printf "Checksum OK"; sleep 1; printf "\r                         \r"
-
 sh "\$tmpexe" "\$@"
 
 exit
-$sha
 EOT
 step "pre-script"
 
-cat "$file" >> "$newfile"
+echo "$bin" >> "$newfile"
 step "post-script"
 
 chmod +x "$newfile"