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1 #!/bin/sh

2

3 [ ! -e "$1" ] && cat <<EOT && exit 2

4 Usage: [FAT=<FAT12|FAT16|FAT32|EXFAT>] $0 device [file]

5 Example: $0 /dev/fd0 STARTUP.BIN

6 EOT

7

8 ddo="dd of=$1 bs=1 conv=notrunc"

9 while read c o b f; do

10 [ "${FAT:-$(dd if="$1" bs=1 count=5 skip=$c)}" = "$f" ] || continue

11 echo "Install $f bootsector on $1."

12 for a in "$((o+b)) seek=$o count=$((512-o))" "$b count=11"; do

13 sed '1,/^exit 1/d' $0 | unlzma | $ddo skip=$a

14 done

15 [ "$2" ] && echo "Set boot file '$2'" && echo -n "$2" | case "$f" in

16 E*) sed 's| |.|;s| ||g' | cat - /dev/zero;;

17 *) tr a-z A-Z | sed 's|\.| |;s|^\(.\{8\}\) *|\1|;s|$| |'

18 esac | $ddo seek=499 count=11

19 [ "$f" = "EXFAT" ] && dd if="$1" bs=512 count=11 | od -v -An -t u1 -w1 - | LANG=C awk '

20 BEGIN { a=0;i=-1;m=0xFFFFFFFE }

21 { if (++i!=106 && i!=107 && i!=112) a=or(and(lshift(a,31),m),and(rshift(a,1),m/2))+$1 }

22 END { b=a/256;c=b/256; for (i=0;i<128;i++) printf "%c%c%c%c",a%256,b%256,c%256,(c/256)%256 }' | $ddo seek=5632

23 exit 0

24 done 2>/dev/null <<EOT

25 54 62 0 FAT12

26 54 62 0 FAT16

27 82 90 512 FAT32

28 3 113 1024 EXFAT

29 EOT

30 exit 1