1*4882a593Smuzhiyun#!/bin/sh -efu 2*4882a593Smuzhiyun# This file comes from rpm 4.x distribution 3*4882a593Smuzhiyun 4*4882a593Smuzhiyunfatal() { 5*4882a593Smuzhiyun echo "$*" >&2 6*4882a593Smuzhiyun exit 1 7*4882a593Smuzhiyun} 8*4882a593Smuzhiyun 9*4882a593Smuzhiyunpkg="$1" 10*4882a593Smuzhiyun[ -n "$pkg" -a -e "$pkg" ] || 11*4882a593Smuzhiyun fatal "No package supplied" 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun_dd() { 14*4882a593Smuzhiyun local o="$1"; shift 15*4882a593Smuzhiyun dd if="$pkg" skip="$o" iflag=skip_bytes status=none $* 16*4882a593Smuzhiyun} 17*4882a593Smuzhiyun 18*4882a593Smuzhiyuncalcsize() { 19*4882a593Smuzhiyun offset=$(($1 + 8)) 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun local i b b0 b1 b2 b3 b4 b5 b6 b7 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun i=0 24*4882a593Smuzhiyun while [ $i -lt 8 ]; do 25*4882a593Smuzhiyun b=$(_dd $(($offset + $i)) bs=1 count=1; echo X) 26*4882a593Smuzhiyun b=${b%X} 27*4882a593Smuzhiyun [ -z "$b" ] && 28*4882a593Smuzhiyun b="0" || 29*4882a593Smuzhiyun b="$(exec printf '%u\n' "'$b")" 30*4882a593Smuzhiyun eval "b$i=\$b" 31*4882a593Smuzhiyun i=$(($i + 1)) 32*4882a593Smuzhiyun done 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun rsize=$((8 + ((($b0 << 24) + ($b1 << 16) + ($b2 << 8) + $b3) << 4) + ($b4 << 24) + ($b5 << 16) + ($b6 << 8) + $b7)) 35*4882a593Smuzhiyun offset=$(($offset + $rsize)) 36*4882a593Smuzhiyun} 37*4882a593Smuzhiyun 38*4882a593Smuzhiyuncase "$(_dd 0 bs=8 count=1)" in 39*4882a593Smuzhiyun "$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb' 40*4882a593Smuzhiyun *) fatal "File doesn't look like rpm: $pkg" ;; 41*4882a593Smuzhiyunesac 42*4882a593Smuzhiyun 43*4882a593Smuzhiyuncalcsize 96 44*4882a593Smuzhiyunsigsize=$rsize 45*4882a593Smuzhiyun 46*4882a593Smuzhiyuncalcsize $(($offset + (8 - ($sigsize % 8)) % 8)) 47*4882a593Smuzhiyunhdrsize=$rsize 48*4882a593Smuzhiyun 49*4882a593Smuzhiyuncase "$(_dd $offset bs=3 count=1)" in 50*4882a593Smuzhiyun "$(printf '\102\132')"*) _dd $offset | bunzip2 ;; # '\x42\x5a' 51*4882a593Smuzhiyun "$(printf '\037\213')"*) _dd $offset | gunzip ;; # '\x1f\x8b' 52*4882a593Smuzhiyun "$(printf '\375\067')"*) _dd $offset | xzcat ;; # '\xfd\x37' 53*4882a593Smuzhiyun "$(printf '\135\000')"*) _dd $offset | unlzma ;; # '\x5d\x00' 54*4882a593Smuzhiyun *) fatal "Unrecognized rpm file: $pkg" ;; 55*4882a593Smuzhiyunesac 56