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" -a -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 $* 16} 17 18calcsize() { 19 offset=$(($1 + 8)) 20 21 local i b b0 b1 b2 b3 b4 b5 b6 b7 22 23 i=0 24 while [ $i -lt 8 ]; do 25 b=$(_dd $(($offset + $i)) bs=1 count=1; echo X) 26 b=${b%X} 27 [ -z "$b" ] && 28 b="0" || 29 b="$(exec printf '%u\n' "'$b")" 30 eval "b$i=\$b" 31 i=$(($i + 1)) 32 done 33 34 rsize=$((8 + ((($b0 << 24) + ($b1 << 16) + ($b2 << 8) + $b3) << 4) + ($b4 << 24) + ($b5 << 16) + ($b6 << 8) + $b7)) 35 offset=$(($offset + $rsize)) 36} 37 38case "$(_dd 0 bs=8 count=1)" in 39 "$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb' 40 *) fatal "File doesn't look like rpm: $pkg" ;; 41esac 42 43calcsize 96 44sigsize=$rsize 45 46calcsize $(($offset + (8 - ($sigsize % 8)) % 8)) 47hdrsize=$rsize 48 49case "$(_dd $offset bs=3 count=1)" in 50 "$(printf '\102\132')"*) _dd $offset | bunzip2 ;; # '\x42\x5a' 51 "$(printf '\037\213')"*) _dd $offset | gunzip ;; # '\x1f\x8b' 52 "$(printf '\375\067')"*) _dd $offset | xzcat ;; # '\xfd\x37' 53 "$(printf '\135\000')"*) _dd $offset | unlzma ;; # '\x5d\x00' 54 *) fatal "Unrecognized rpm file: $pkg" ;; 55esac 56