| #!/bin/sh -efu |
| # This file comes from rpm 4.x distribution |
| |
| fatal() { |
| echo "$*" >&2 |
| exit 1 |
| } |
| |
| pkg="$1" |
| [ -n "$pkg" -a -e "$pkg" ] || |
| fatal "No package supplied" |
| |
| _dd() { |
| local o="$1"; shift |
| dd if="$pkg" skip="$o" iflag=skip_bytes status=none $* |
| } |
| |
| calcsize() { |
| offset=$(($1 + 8)) |
| |
| local i b b0 b1 b2 b3 b4 b5 b6 b7 |
| |
| i=0 |
| while [ $i -lt 8 ]; do |
| b=$(_dd $(($offset + $i)) bs=1 count=1; echo X) |
| b=${b%X} |
| [ -z "$b" ] && |
| b="0" || |
| b="$(exec printf '%u\n' "'$b")" |
| eval "b$i=\$b" |
| i=$(($i + 1)) |
| done |
| |
| rsize=$((8 + ((($b0 << 24) + ($b1 << 16) + ($b2 << 8) + $b3) << 4) + ($b4 << 24) + ($b5 << 16) + ($b6 << 8) + $b7)) |
| offset=$(($offset + $rsize)) |
| } |
| |
| case "$(_dd 0 bs=8 count=1)" in |
| "$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb' |
| *) fatal "File doesn't look like rpm: $pkg" ;; |
| esac |
| |
| calcsize 96 |
| sigsize=$rsize |
| |
| calcsize $(($offset + (8 - ($sigsize % 8)) % 8)) |
| hdrsize=$rsize |
| |
| case "$(_dd $offset bs=3 count=1)" in |
| "$(printf '\102\132')"*) _dd $offset | bzip2 -d ;; # '\x42\x5a' |
| "$(printf '\037\213')"*) _dd $offset | gunzip ;; # '\x1f\x8b' |
| "$(printf '\375\067')"*) _dd $offset | xzcat ;; # '\xfd\x37' |
| "$(printf '\135\000')"*) _dd $offset | unlzma ;; # '\x5d\x00' |
| *) fatal "Unrecognized rpm file: $pkg" ;; |
| esac |