@@ -7,7 +7,7 @@ fatal() {
}
pkg="$1"
-[ -n "$pkg" -a -e "$pkg" ] ||
+[ -n "$pkg" ] && [ -e "$pkg" ] ||
fatal "No package supplied"
_dd() {
@@ -16,14 +16,23 @@ _dd() {
}
calcsize() {
+
+ case "$(_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 + $i)) bs=1 count=1; echo X)
- b=${b%X}
+ # 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' "'$b")"
@@ -35,7 +44,7 @@ calcsize() {
offset=$(($offset + $rsize))
}
-case "$(_dd 0 bs=8 count=1)" in
+case "$(_dd 0 bs=4 count=1 | tr -d '\0')" in
"$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb'
*) fatal "File doesn't look like rpm: $pkg" ;;
esac
@@ -46,10 +55,11 @@ sigsize=$rsize
calcsize $(($offset + (8 - ($sigsize % 8)) % 8))
hdrsize=$rsize
-case "$(_dd $offset bs=3 count=1)" in
- "$(printf '\102\132')"*) _dd $offset | bzip2 -d ;; # '\x42\x5a'
- "$(printf '\037\213')"*) _dd $offset | gunzip ;; # '\x1f\x8b'
- "$(printf '\375\067')"*) _dd $offset | xzcat ;; # '\xfd\x37'
- "$(printf '\135\000')"*) _dd $offset | unlzma ;; # '\x5d\x00'
- *) 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