Markus F.X.J. Oberhumer
54 lines
1.5 KiB
Perl
54 lines
1.5 KiB
Perl
#! /usr/bin/perl -w
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#
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# setfold.pl -- set Elf32_Phdr[1].p_offset
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#
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# This file is part of the UPX executable compressor.
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#
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# Copyright (C) 2000 John F. Reiser. All rights reserved.
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#
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# UPX and the UCL library are free software; you can redistribute them
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# and/or modify them under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; see the file COPYING.
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# If not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# John Reiser
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# jreiser@BitWagon.com
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#
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$fname = shift || die;
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sysopen (FH,$fname,2) || die;
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binmode FH;
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$fsize = (stat($fname))[7];
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$val = shift || die "$val";
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###print STDERR "$val\n";
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$val = oct($val); # acutally hex()
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$val = $val & 0xfff;
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printf STDERR "$fname: setting fold to 0x%x, file size 0x%x\n", $val, $fsize;
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die unless $val > 0;
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die unless $val < $fsize;
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$num = pack("V", $val);
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# 0x34 = sizeof(Elf32_Ehdr)
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# 0x20 = sizeof(Elf32_Phdr)
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# 4 = offset(p_offset)
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sysseek (FH,0x34+0x20+4,0) || die;
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syswrite (FH,$num,4) || die;
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close(FH) || die;
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exit 0;
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# vi:ts=4:et
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