wok annotate syslinux/stuff/tools/isohybrid.sh @ rev 8403

syslinux: add help in isohybrid
author Pascal Bellard <pascal.bellard@slitaz.org>
date Sat Feb 05 19:43:16 2011 +0100 (2011-02-05)
parents 7d5ccd76597b
children f25f2e389934
rev   line source
pascal@4513 1 #!/bin/sh
pascal@4513 2
pascal@7859 3 if [ "$1" == "--build" ]; then
pascal@7859 4 cat >> $0 <<EOM
pascal@7859 5 $(for i in fx fx_f fx_c px px_f px_c ; do
pascal@7860 6 cat mbr/isohdp$i.bin /dev/zero | dd bs=1 count=512 2> /dev/null
pascal@7859 7 done | gzip -9 | uuencode -m -)
pascal@4513 8 EOT
pascal@4513 9 EOM
pascal@7859 10 sed -i '/--build/,/^fi/d' $0
pascal@4513 11 exit
pascal@4513 12 fi
pascal@7859 13 iso=
pascal@7859 14 heads=64 # zipdrive-style geometry
pascal@7859 15 sectors=32
pascal@7859 16 partype=23 # "Windows hidden IFS"
pascal@7859 17 entry=1
pascal@7859 18 id=$(( ($RANDOM <<16) + $RANDOM))
pascal@7859 19 offset=0
pascal@7859 20 partok=0
pascal@7859 21 hd0=0
pascal@4513 22
pascal@7859 23 while [ -n "$1" ]; do
pascal@7859 24 case "$1" in
pascal@8403 25 -ct*) hd0=2;;
pascal@8403 26 -e*|--e*) entry=$2; shift;;
pascal@8403 27 -f*) hd0=1;;
pascal@8403 28 -h) heads=$2; shift;;
pascal@8403 29 -i|--i**) id=$(($2)); shift;;
pascal@8403 30 -noh*) hd0=0;;
pascal@8403 31 -nop*) partok=0;;
pascal@8403 32 -o*|--o*) offset=$(($2)); shift;;
pascal@8403 33 -p*) partok=1;;
pascal@8403 34 -s) sectors=$2; shift;;
pascal@8403 35 -t*|--t*) partype=$(($2 & 255)); shift;;
pascal@8403 36 *) iso=$1;;
pascal@7859 37 esac
pascal@7859 38 shift
pascal@7859 39 done
pascal@7859 40
pascal@7859 41 if [ ! -f "$iso" ]; then
pascal@4513 42 cat << EOT
pascal@8403 43 usage: $0 [options] isoimage
pascal@8403 44 options:
pascal@8403 45 -h <X> Number of default geometry heads
pascal@8403 46 -s <X> Number of default geometry sectors
pascal@8403 47 -e --entry Specify partition entry number (1-4)
pascal@8403 48 -o --offset Specify partition offset (default 0)
pascal@8403 49 -t --type Specify partition type (default 0x17)
pascal@8403 50 -i --id Specify MBR ID (default random)
pascal@8403 51 --forcehd0 Assume we are loaded as disk ID 0
pascal@8403 52 --ctrlhd0 Assume disk ID 0 if the Ctrl key is pressed
pascal@8403 53 --partok Allow booting from within a partition
pascal@4513 54 EOT
pascal@4513 55 exit 1
pascal@4513 56 fi
pascal@7859 57
pascal@7859 58 ddq()
pascal@7859 59 {
pascal@7859 60 dd "$@" 2> /dev/null
pascal@7859 61 }
pascal@4513 62
pascal@4513 63 readiso()
pascal@4513 64 {
pascal@7859 65 ddq bs=2k skip=$1 count=1 if=$iso | ddq bs=1 skip=$2 count=$3
pascal@4513 66 }
pascal@4513 67
pascal@4513 68 # read a 32 bits data
pascal@7859 69 read32()
pascal@4513 70 {
pascal@7859 71 readiso $1 $2 4 | hexdump -e '"" 1/4 "%d" "\n"'
pascal@4513 72 }
pascal@4513 73
pascal@4513 74 # write a 32 bits data
pascal@7859 75 store32()
pascal@4513 76 {
pascal@8399 77 n=$2; i=4; while [ $i -ne 0 ]; do
pascal@8399 78 printf '\\\\x%02X' $(($n & 255))
pascal@8399 79 i=$(($i-1)); n=$(($n >> 8))
pascal@8399 80 done | xargs echo -en | ddq bs=1 conv=notrunc of=$iso seek=$(($1))
pascal@4513 81 }
pascal@4513 82
pascal@7859 83 main()
pascal@4513 84 {
pascal@7859 85 uudecode | gunzip | ddq bs=512 count=1 of=$iso conv=notrunc \
pascal@7859 86 skip=$(( (3*$partok) + $hd0))
pascal@7859 87 store32 432 $(($lba * 4))
pascal@7859 88 store32 440 $id
pascal@8400 89 store32 508 0xAA550000
pascal@7859 90 e=$(( (($entry -1) % 4) *16 +446))
pascal@8400 91 store32 $e 0x10080
pascal@7859 92 esect=$(( ($sectors + ((($cylinders -1) & 0x300) >>2)) <<16))
pascal@7859 93 ecyl=$(( (($cylinders -1) & 0xff) <<24))
pascal@7859 94 store32 $(($e + 4)) $(($partype + (($heads - 1) <<8) +$esect +$ecyl))
pascal@7859 95 store32 $(($e + 8)) $offset
pascal@7859 96 store32 $(($e + 12)) $(($cylinders * $heads * $sectors))
pascal@4513 97 }
pascal@4513 98
pascal@7859 99 abort()
pascal@7859 100 {
pascal@7859 101 echo "$iso: $1"
pascal@4513 102 exit 1
pascal@7859 103 }
pascal@7859 104
pascal@7859 105 [ "$(readiso 17 7 23)" == "EL TORITO SPECIFICATION" ] ||
pascal@7859 106 abort "no boot record found."
pascal@7859 107 cat=$(read32 17 71)
pascal@7859 108 [ $(read32 $cat 0) -eq 1 -a $(read32 $cat 30) -eq $(( 0x88AA55 )) ] ||
pascal@7859 109 abort "invalid boot catalog."
pascal@7859 110 lba=$(read32 $cat 40)
pascal@7859 111 [ $(read32 $lba 64) -eq 1886961915 ] ||
pascal@7859 112 abort "no isolinux.bin hybrid signature in bootloader."
pascal@4513 113 size=$(stat -c "%s" $iso)
pascal@7859 114 trksz=$(( 512 * $heads * $sectors ))
pascal@7859 115 cylinders=$(( ($size + $trksz - 1) / $trksz ))
pascal@7859 116 pad=$(( (($cylinders * $trksz) - $size) / 512 ))
pascal@7859 117 [ $pad -eq 0 ] || ddq bs=512 count=$pad if=/dev/zero >> $iso
pascal@4513 118 if [ $cylinders -gt 1024 ]; then
pascal@4513 119 cat 1>&2 <<EOT
pascal@4513 120 Warning: more than 1024 cylinders ($cylinders).
pascal@4513 121 Not all BIOSes will be able to boot this device.
pascal@4513 122 EOT
pascal@4513 123 cylinders=1024
pascal@4513 124 fi
pascal@4513 125
pascal@7859 126 main <<EOT