#!/usr/perl5/bin/perl

# Copyright (C) 1997,1998,1999, Roger Espel Llima

# 

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and any associated documentation files (the "Software"), to 

# deal in the Software without restriction, including without limitation the 

# rights to use, copy, modify, merge, publish, distribute, sublicense, 

# and/or sell copies of the Software, and to permit persons to whom the 

# Software is furnished to do so, subject to the following conditions:

# 

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

# 

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE

# SOFTWARE'S COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

# THE SOFTWARE

# (whew, that's done!)

# why does the world need another rpm2cpio?  because the existing one

# won't build unless you have half a ton of things that aren't really

# required for it, since it uses the same library used to extract RPM's.

# in particular, it won't build on the HPsUX box i'm on.

# add a path if desired

$gzip = "gzip";

sub printhelp {

  print <<HERE;

rpm2cpio, perl version by orabidoo <odar\@pobox.com>

dumps the contents to stdout as a cpio archive

use: rpm2cpio [file.rpm] > file.cpio

Here's how to use cpio:

     list of contents:   cpio -t -i < /file/name

        extract files:   cpio -d -i < /file/name

HERE

  exit 0;

}

if ($#ARGV == -1) {

  printhelp if -t STDIN;

  $f = "STDIN";

} elsif ($#ARGV == 0) {

  open(F, "< $ARGV[0]") or die "Can't read file $ARGV[0]\n";

  $f = 'F';

} else {

  printhelp;

}

printhelp if -t STDOUT;

# gobble the file up

undef $/;

$|=1;

$rpm = <$f>;

close ($f);

($magic, $major, $minor, $crap) = unpack("NCC C90", $rpm);

die "Not an RPM\n" if $magic != 0xedabeedb;

die "Not a version 3 or 4 RPM\n" if $major != 3 && $major != 4;

$rpm = substr($rpm, 96);

while ($rpm ne '') {

  $rpm =~ s/^\c@*//s;

  ($magic, $crap, $sections, $bytes) = unpack("N4", $rpm);

  $smagic = unpack("n", $rpm);

  last if $smagic eq 0x1f8b;

  die "Error: header not recognized\n" if $magic != 0x8eade801;

  $rpm = substr($rpm, 16*(1+$sections) + $bytes);

}

die "bogus RPM\n" if $rpm eq '';

open(ZCAT, "|gzip -cd") || die "can't pipe to gzip\n";

print STDERR "CPIO archive found!\n";

print ZCAT $rpm;

close ZCAT;