Monon Color (Moonoon Color) save dumper/injector

mncsave.sh

#!/bin/bash
# Old code, published as-is. Should work on most 64Mbit games. Not sure about others.

SAVE_OFFSET=$((0x50000))
SAVE_SIZE=$((0x20000))

save_read() {
    dd if="$1" of="$2" \
        iflag=skip_bytes,count_bytes count=$SAVE_SIZE skip=$SAVE_OFFSET
}

save_write() {
    dd if="$2" of="$1" \
        iflag=count_bytes oflag=seek_bytes conv=nocreat,notrunc \
        count=$SAVE_SIZE seek=$SAVE_OFFSET
}

save_erase() {
    tr "\000" "\377" < /dev/zero | \
        dd of="$1" iflag=count_bytes oflag=seek_bytes conv=nocreat,notrunc \
            count=$SAVE_SIZE seek=$SAVE_OFFSET
}

_die() {
    if [[ ! -z "$2" ]]; then
        echo "$2" 1>&2
    fi
    exit $1
}

if [[ $# -lt 2 ]]; then
    _die 1 "Usage: $0 r|w|e <rom> [save]"
fi

case "$1" in
    e|erase)
        save_erase "$2"
        ;;
    r|read)
        if [[ $# -lt 3 ]]; then _die 1 "Save file not specified"; fi
        save_read "$2" "$3"
        ;;
    w|write)
        if [[ $# -lt 3 ]]; then _die 1 "Save file not specified"; fi
        save_write "$2" "$3"
        ;;
    *)
        _die 1 "Usage: $0 r|w|e <rom> [save]"
        ;;
esac