1eb8dc403SDave Cobbley#!/bin/sh -efu 2eb8dc403SDave Cobbley# This file comes from rpm 4.x distribution 3eb8dc403SDave Cobbley 4eb8dc403SDave Cobbleyfatal() { 5eb8dc403SDave Cobbley echo "$*" >&2 6eb8dc403SDave Cobbley exit 1 7eb8dc403SDave Cobbley} 8eb8dc403SDave Cobbley 9eb8dc403SDave Cobbleypkg="$1" 10*520786ccSPatrick Williams[ -n "$pkg" ] && [ -e "$pkg" ] || 11eb8dc403SDave Cobbley fatal "No package supplied" 12eb8dc403SDave Cobbley 13eb8dc403SDave Cobbley_dd() { 14eb8dc403SDave Cobbley local o="$1"; shift 15eb8dc403SDave Cobbley dd if="$pkg" skip="$o" iflag=skip_bytes status=none $* 16eb8dc403SDave Cobbley} 17eb8dc403SDave Cobbley 18eb8dc403SDave Cobbleycalcsize() { 19*520786ccSPatrick Williams 20*520786ccSPatrick Williams case "$(_dd $1 bs=4 count=1 | tr -d '\0')" in 21*520786ccSPatrick Williams "$(printf '\216\255\350')"*) ;; # '\x8e\xad\xe8' 22*520786ccSPatrick Williams *) fatal "File doesn't look like rpm: $pkg" ;; 23*520786ccSPatrick Williams esac 24*520786ccSPatrick Williams 25eb8dc403SDave Cobbley offset=$(($1 + 8)) 26eb8dc403SDave Cobbley 27eb8dc403SDave Cobbley local i b b0 b1 b2 b3 b4 b5 b6 b7 28eb8dc403SDave Cobbley 29eb8dc403SDave Cobbley i=0 30eb8dc403SDave Cobbley while [ $i -lt 8 ]; do 31*520786ccSPatrick Williams # add . to not loose \n 32*520786ccSPatrick Williams # strip \0 as it gets dropped with warning otherwise 33*520786ccSPatrick Williams b="$(_dd $(($offset + $i)) bs=1 count=1 | tr -d '\0' ; echo .)" 34*520786ccSPatrick Williams b=${b%.} # strip . again 35*520786ccSPatrick Williams 36eb8dc403SDave Cobbley [ -z "$b" ] && 37eb8dc403SDave Cobbley b="0" || 38eb8dc403SDave Cobbley b="$(exec printf '%u\n' "'$b")" 39eb8dc403SDave Cobbley eval "b$i=\$b" 40eb8dc403SDave Cobbley i=$(($i + 1)) 41eb8dc403SDave Cobbley done 42eb8dc403SDave Cobbley 43eb8dc403SDave Cobbley rsize=$((8 + ((($b0 << 24) + ($b1 << 16) + ($b2 << 8) + $b3) << 4) + ($b4 << 24) + ($b5 << 16) + ($b6 << 8) + $b7)) 44eb8dc403SDave Cobbley offset=$(($offset + $rsize)) 45eb8dc403SDave Cobbley} 46eb8dc403SDave Cobbley 47*520786ccSPatrick Williamscase "$(_dd 0 bs=4 count=1 | tr -d '\0')" in 48eb8dc403SDave Cobbley "$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb' 49eb8dc403SDave Cobbley *) fatal "File doesn't look like rpm: $pkg" ;; 50eb8dc403SDave Cobbleyesac 51eb8dc403SDave Cobbley 52eb8dc403SDave Cobbleycalcsize 96 53eb8dc403SDave Cobbleysigsize=$rsize 54eb8dc403SDave Cobbley 55eb8dc403SDave Cobbleycalcsize $(($offset + (8 - ($sigsize % 8)) % 8)) 56eb8dc403SDave Cobbleyhdrsize=$rsize 57eb8dc403SDave Cobbley 58*520786ccSPatrick Williamscase "$(_dd $offset bs=2 count=1 | tr -d '\0')" in 59*520786ccSPatrick Williams "$(printf '\102\132')") _dd $offset | bunzip2 ;; # '\x42\x5a' 60*520786ccSPatrick Williams "$(printf '\037\213')") _dd $offset | gunzip ;; # '\x1f\x8b' 61*520786ccSPatrick Williams "$(printf '\375\067')") _dd $offset | xzcat ;; # '\xfd\x37' 62*520786ccSPatrick Williams "$(printf '\135')") _dd $offset | unlzma ;; # '\x5d\x00' 63*520786ccSPatrick Williams "$(printf '\050\265')") _dd $offset | unzstd ;; # '\x28\xb5' 64*520786ccSPatrick Williams *) fatal "Unrecognized payload compression format in rpm file: $pkg" ;; 65eb8dc403SDave Cobbleyesac 66