blob: 876c53c5d913afad6759299975c8dbc55f2f8e8e [file] [log] [blame]
Brad Bishop6e60e8b2018-02-01 10:27:11 -05001#!/bin/sh -efu
Brad Bishop6e60e8b2018-02-01 10:27:11 -05002# This file comes from rpm 4.x distribution
Patrick Williamsc124f4f2015-09-15 14:41:29 -05003
Brad Bishop6e60e8b2018-02-01 10:27:11 -05004fatal() {
5 echo "$*" >&2
6 exit 1
7}
Patrick Williamsc124f4f2015-09-15 14:41:29 -05008
Brad Bishop6e60e8b2018-02-01 10:27:11 -05009pkg="$1"
10[ -n "$pkg" -a -e "$pkg" ] ||
11 fatal "No package supplied"
Patrick Williamsc124f4f2015-09-15 14:41:29 -050012
Brad Bishop6e60e8b2018-02-01 10:27:11 -050013_dd() {
14 local o="$1"; shift
15 dd if="$pkg" skip="$o" iflag=skip_bytes status=none $*
16}
Patrick Williamsc124f4f2015-09-15 14:41:29 -050017
Brad Bishop6e60e8b2018-02-01 10:27:11 -050018calcsize() {
19 offset=$(($1 + 8))
Patrick Williamsc124f4f2015-09-15 14:41:29 -050020
Brad Bishop6e60e8b2018-02-01 10:27:11 -050021 local i b b0 b1 b2 b3 b4 b5 b6 b7
Patrick Williamsc124f4f2015-09-15 14:41:29 -050022
Brad Bishop6e60e8b2018-02-01 10:27:11 -050023 i=0
24 while [ $i -lt 8 ]; do
25 b="$(_dd $(($offset + $i)) bs=1 count=1)"
26 [ -z "$b" ] &&
27 b="0" ||
28 b="$(exec printf '%u\n' "'$b")"
29 eval "b$i=\$b"
30 i=$(($i + 1))
31 done
32
33 rsize=$((8 + ((($b0 << 24) + ($b1 << 16) + ($b2 << 8) + $b3) << 4) + ($b4 << 24) + ($b5 << 16) + ($b6 << 8) + $b7))
34 offset=$(($offset + $rsize))
35}
36
37case "$(_dd 0 bs=8 count=1)" in
38 "$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb'
39 *) fatal "File doesn't look like rpm: $pkg" ;;
40esac
41
42calcsize 96
43sigsize=$rsize
44
45calcsize $(($offset + (8 - ($sigsize % 8)) % 8))
46hdrsize=$rsize
47
48case "$(_dd $offset bs=3 count=1)" in
49 "$(printf '\102\132')"*) _dd $offset | bunzip2 ;; # '\x42\x5a'
50 "$(printf '\037\213')"*) _dd $offset | gunzip ;; # '\x1f\x8b'
51 "$(printf '\375\067')"*) _dd $offset | xzcat ;; # '\xfd\x37'
52 "$(printf '\135\000')"*) _dd $offset | unlzma ;; # '\x5d\x00'
53 *) fatal "Unrecognized rpm file: $pkg" ;;
54esac