diff --git a/scripts/rpm2cpio.sh b/scripts/rpm2cpio.sh

index 4531271cc..74aeed851 100755

--- a/scripts/rpm2cpio.sh

+++ b/scripts/rpm2cpio.sh

@@ -15,13 +15,23 @@ _dd() {

 }

 calcsize() {

+

+	case "$(_dd $1 bs=4 count=1 | tr -d '\0')" in

+		"$(printf '\216\255\350')"*) ;; # '\x8e\xad\xe8'

+		*) fatal "File doesn't look like rpm: $pkg" ;;

+	esac

+

 	offset=$(($1 + 8))

 	local i b b0 b1 b2 b3 b4 b5 b6 b7

 	i=0

 	while [ $i -lt 8 ]; do

-		b="$(_dd $(($offset + $i)) bs=1 count=1)"

+		# add . to not loose \n

+		# strip \0 as it gets dropped with warning otherwise

+		b="$(_dd $(($offset + $i)) bs=1 count=1 | tr -d '\0' ; echo .)"

+		b=${b%.}    # strip . again

+

 		[ -z "$b" ] &&

 			b="0" ||

 			b="$(exec printf '%u\n' "'$b")"

@@ -33,7 +43,7 @@ calcsize() {

 	offset=$(($offset + $rsize))

 }

-case "$(_dd 0 bs=8 count=1)" in

+case "$(_dd 0 bs=8 count=1 | tr -d '\0')" in

 	"$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb'

 	*) fatal "File doesn't look like rpm: $pkg" ;;

 esac

@@ -44,11 +54,11 @@ sigsize=$rsize

 calcsize $(($offset + (8 - ($sigsize % 8)) % 8))

 hdrsize=$rsize

-case "$(_dd $offset bs=3 count=1)" in

-	"$(printf '\102\132')"*) _dd $offset | bunzip2 ;; # '\x42\x5a'

-	"$(printf '\037\213')"*) _dd $offset | gunzip  ;; # '\x1f\x8b'

-	"$(printf '\375\067')"*) _dd $offset | xzcat   ;; # '\xfd\x37'

-	"$(printf '\135\000')"*) _dd $offset | unlzma  ;; # '\x5d\x00'

-	"$(printf '\050\265')"*) _dd $offset | unzstd  ;; # '\x28\xb5'

-	*) fatal "Unrecognized rpm file: $pkg" ;;

+case "$(_dd $offset bs=2 count=1 | tr -d '\0')" in

+	"$(printf '\102\132')") _dd $offset | bunzip2 ;; # '\x42\x5a'

+	"$(printf '\037\213')") _dd $offset | gunzip  ;; # '\x1f\x8b'

+	"$(printf '\375\067')") _dd $offset | xzcat   ;; # '\xfd\x37'

+	"$(printf '\135')") _dd $offset | unlzma      ;; # '\x5d\x00'

+	"$(printf '\050\265')") _dd $offset | unzstd  ;; # '\x28\xb5'

+	*) fatal "Unrecognized payload compression format in rpm file: $pkg" ;;

 esac