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#!/bin/sh -efu 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 + $i)) bs=1 count=1)" [ -z "$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 $offset | bunzip2 ;; # '\x42\x5a' "$(printf '\037\213')"*) _dd $offset | gunzip ;; # '\x1f\x8b' "$(printf '\375\067')"*) _dd $offset | xzcat ;; # '\xfd\x37' "$(printf '\135\000')"*) _dd $offset | unlzma ;; # '\x5d\x00' "$(printf '\050\265')"*) _dd $offset | unzstd ;; # '\x28\xb5' *) fatal "Unrecognized rpm file: $pkg" ;; esac
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