1#!/bin/sh -efu 2# This file comes from rpm 4.x distribution 3 4fatal() { 5 echo "$*" >&2 6 exit 1 7} 8 9pkg="$1" 10[ -n "$pkg" ] && [ -e "$pkg" ] || 11 fatal "No package supplied" 12 13_dd() { 14 local o="$1"; shift 15 dd if="$pkg" skip="$o" iflag=skip_bytes status=none $* 16} 17 18calcsize() { 19 20 case "$(_dd $1 bs=4 count=1 | tr -d '\0')" in 21 "$(printf '\216\255\350')"*) ;; # '\x8e\xad\xe8' 22 *) fatal "File doesn't look like rpm: $pkg" ;; 23 esac 24 25 offset=$(($1 + 8)) 26 27 local i b b0 b1 b2 b3 b4 b5 b6 b7 28 29 i=0 30 while [ $i -lt 8 ]; do 31 # add . to not loose \n 32 # strip \0 as it gets dropped with warning otherwise 33 b="$(_dd $(($offset + $i)) bs=1 count=1 | tr -d '\0' ; echo .)" 34 b=${b%.} # strip . again 35 36 [ -z "$b" ] && 37 b="0" || 38 b="$(exec printf '%u\n' "'$b")" 39 eval "b$i=\$b" 40 i=$(($i + 1)) 41 done 42 43 rsize=$((8 + ((($b0 << 24) + ($b1 << 16) + ($b2 << 8) + $b3) << 4) + ($b4 << 24) + ($b5 << 16) + ($b6 << 8) + $b7)) 44 offset=$(($offset + $rsize)) 45} 46 47case "$(_dd 0 bs=4 count=1 | tr -d '\0')" in 48 "$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb' 49 *) fatal "File doesn't look like rpm: $pkg" ;; 50esac 51 52calcsize 96 53sigsize=$rsize 54 55calcsize $(($offset + (8 - ($sigsize % 8)) % 8)) 56hdrsize=$rsize 57 58case "$(_dd $offset bs=2 count=1 | tr -d '\0')" in 59 "$(printf '\102\132')") _dd $offset | bunzip2 ;; # '\x42\x5a' 60 "$(printf '\037\213')") _dd $offset | gunzip ;; # '\x1f\x8b' 61 "$(printf '\375\067')") _dd $offset | xzcat ;; # '\xfd\x37' 62 "$(printf '\135')") _dd $offset | unlzma ;; # '\x5d\x00' 63 "$(printf '\050\265')") _dd $offset | unzstd ;; # '\x28\xb5' 64 *) fatal "Unrecognized payload compression format in rpm file: $pkg" ;; 65esac 66