diff options
| -rw-r--r-- | package/base-files/files/lib/upgrade/common.sh | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/package/base-files/files/lib/upgrade/common.sh b/package/base-files/files/lib/upgrade/common.sh index e3519ca2cb..3ddd1e7465 100644 --- a/package/base-files/files/lib/upgrade/common.sh +++ b/package/base-files/files/lib/upgrade/common.sh @@ -267,6 +267,14 @@ export_partdevice() { return 1 } +hex_le32_to_cpu() { + [ "$(echo 01 | hexdump -v -n 2 -e '/2 "%x"')" == "3031" ] && { + echo "${1:0:2}${1:8:2}${1:6:2}${1:4:2}${1:2:2}" + return + } + echo "$@" +} + get_partitions() { # <device> <filename> local disk="$1" local filename="$2" @@ -274,8 +282,8 @@ get_partitions() { # <device> <filename> if [ -b "$disk" -o -f "$disk" ]; then v "Reading partition table from $filename..." - local magic="$(hexdump -v -n 2 -s 0x1FE -e '1/2 "0x%04X"' "$disk")" - if [ "$magic" != 0xAA55 ]; then + local magic=$(dd if="$disk" bs=2 count=1 skip=255 2>/dev/null) + if [ "$magic" != $'\x55\xAA' ]; then v "Invalid partition table on $disk" exit fi @@ -286,9 +294,9 @@ get_partitions() { # <device> <filename> for part in 1 2 3 4; do set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk") - local type="$(($1 % 256))" - local lba="$(($2))" - local num="$(($3))" + local type="$(( $(hex_le32_to_cpu $1) % 256))" + local lba="$(( $(hex_le32_to_cpu $2) ))" + local num="$(( $(hex_le32_to_cpu $3) ))" [ $type -gt 0 ] || continue |