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- #!/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 $offset | bunzip2 ;; # '\x42\x5a'
- "$(printf '\037\213')"*) _dd $offset | gunzip ;; # '\x1f\x8b'
- "$(printf '\375\067')"*) _dd $offset | xzcat ;; # '\xfd\x37'
- "$(printf '\135\000')"*) _dd $offset | unlzma ;; # '\x5d\x00'
- *) fatal "Unrecognized rpm file: $pkg" ;;
- esac
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