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#!/usr/bin/perl
#
# align.pl - aligns images to a 512 byte boundary
#
# Ken Steele
# Copyright (c) Chumby Industries, 2007
#
# align.pl is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# align.pl is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with align.pl; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
my $filename = $ARGV[0] || die( "syntax: $0 <filename>\n" );
my $filesize = -s $filename;
if( $filesize % 512 )
{
my $blocksNeeded = int( ( $filesize + 511 ) / 512 );
print "filesize: $filesize\n";
print "blocks needed: $blocksNeeded\n";
my $padding = ( $blocksNeeded * 512 ) - $filesize;
print "adding $padding bytes of 0xFF padding to $filename\n";
open( F, ">>$filename" );
binmode F;
for( my $i = 0; $i < $padding; ++$i )
{
print F "\xff";
}
close( F );
my $newFilesize = -s $filename;
print "new filesize: $newFilesize\n";
}
else
{
print "$filename is 512 byte aligned\n";
}