#!/bin/sh -efu

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fatal() {

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echo "$*" >&2

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exit 1

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}

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pkg="$1"

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[ -n "$pkg" -a -e "$pkg" ] ||

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fatal "No package supplied"

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_dd() {

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local o="$1"; shift

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dd if="$pkg" skip="$o" iflag=skip_bytes status=none $*

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}

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calcsize() {

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offset=$(($1 + 8))

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local i b b0 b1 b2 b3 b4 b5 b6 b7

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i=0

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while [ $i -lt 8 ]; do

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b="$(_dd $(($offset + $i)) bs=1 count=1)"

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[ -z "$b" ] &&

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b="0" ||

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b="$(exec printf '%u\n' "'$b")"

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eval "b$i=\$b"

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i=$(($i + 1))

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done

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rsize=$((8 + ((($b0 << 24) + ($b1 << 16) + ($b2 << 8) + $b3) << 4) + ($b4 << 24) + ($b5 << 16) + ($b6 << 8) + $b7))

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offset=$(($offset + $rsize))

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}

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case "$(_dd 0 bs=8 count=1)" in

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"$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb'

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*) fatal "File doesn't look like rpm: $pkg" ;;

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esac

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calcsize 96

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sigsize=$rsize

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calcsize $(($offset + (8 - ($sigsize % 8)) % 8))

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hdrsize=$rsize

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case "$(_dd $offset bs=3 count=1)" in

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"$(printf '\102\132')"*) _dd $offset | bunzip2 ;; # '\x42\x5a'

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"$(printf '\037\213')"*) _dd $offset | gunzip ;; # '\x1f\x8b'

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"$(printf '\375\067')"*) _dd $offset | xzcat ;; # '\xfd\x37'

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"$(printf '\135\000')"*) _dd $offset | unlzma ;; # '\x5d\x00'

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"$(printf '\050\265')"*) _dd $offset | unzstd ;; # '\x28\xb5'

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*) fatal "Unrecognized rpm file: $pkg" ;;

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esac

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