20xx 4.06 conversion script for Mac

20xx-4.06-convert.sh

#!/bin/sh

version=4.07
vanillamd5="0e63d4223b01d9aba596259dc155a174"
modmd5="c8ccc5cd8788fe0cf8f24bca123e4a2e"

infile="$1"
outfile="SSBM, 20XXHP ${version}.iso"
delta="SSBM, 20XXHP ${version} xdelta patch.xdelta"

which -s brew
if [[ $? != 0 ]] ; then
    # Install Homebrew
    printf "The script requires Homebrew.\n"
    printf "See https://brew.sh/ for installation instructions.\n"
    exit 1
else
    brew install xdelta
fi

xdelta=xdelta3
md5sum=md5


checkhash () {
  printf "    This will take a few moments...."
  filehash=$(${md5sum} -q "$1")
  if [ "$filehash" != "$2" ]; then
    printf "FAIL\n"
    printf "Hashes don't match. Continue? (y/n) "
    read cont;
    if [ "$cont" != "y" ]; then
      exit
    fi
  fi
  printf "SUCCESS\n"
}

build () {
  if [ -f "$outfile" ]; then
    printf "File $outfile already exists. Overwrite? (y/n) "
    read overwrite
    if [ "$overwrite" != "y" ]; then
      exit
    fi
  fi
  printf "Constructing 20XXHP ${version}.\n"
  printf "    Please stand by...."

  $xdelta -f -d -s "$infile" "$delta" "$outfile" 2>/dev/null && printf "SUCCESS\n" || printf "FAIL\n"
}

if [ "$infile" = "" ]; then
  printf "usage: 20xx-${version}-convert.sh FILE\n"
  exit
fi
printf "Verifying that the given file is a vanilla v1.02 copy of SSBM.\n"
checkhash "$infile" "$vanillamd5"
printf "The ISO has been verified!\n\n"

build
test $? -eq 0 || exit
printf "Conversion complete!\n\n"

printf "Would you like to check the hash of your new 20XX copy? (y/n): "
read check;
if [ "$check" = "y" ]; then
  checkhash "$outfile" "$modmd5"
fi