gog_unpack.sh

#!/bin/bash

# $1 - exe part of the archive

# Note:
# Game ID can also be obtained as
# game_id=$(curl -s -o- "$gog_game_url" | pcregrep --buffer-size 1M -o1 "addToCart\('/cart/add/(\d+)'\)")

rar_header='526172211a07'

innoextract "$1"

bin_file=${1%%.exe}.bin

if [ ! -e "$bin_file" ]
then
   exit
fi

header=$(xxd -p -l 6 "$bin_file")
if [[ "$header" == "$rar_header" ]]
then
   game_id=$(ls -1 tmp/ | pcregrep -o1 '(\d+)\.ini')
   game_pass=$(printf "$game_id" | md5sum | cut -d ' ' -f 1)
   unrar x "$bin_file" -p"$game_pass"
fi