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#!perl -w
use strict;
# All the IMAGE_* structures are defined in the WINNT.H file
# of the Microsoft Platform SDK.
my %subsys = (NATIVE => 1,
WINDOWS => 2,
CONSOLE => 3,
POSIX => 7,
WINDOWSCE => 9);
unless (0 < @ARGV && @ARGV < 3) {
printf "Usage: $0 exefile [%s]\n", join '|', sort keys %subsys;
exit;
}
$ARGV[1] = uc $ARGV[1] if $ARGV[1];
unless (@ARGV == 1 || defined $subsys{$ARGV[1]}) {
(my $subsys = join(', ', sort keys %subsys)) =~ s/, (\w+)$/ or $1/;
print "Invalid subsystem $ARGV[1], please use $subsys\n";
exit;
}
my ($record,$magic,$signature,$offset,$size);
open EXE, '+<', $ARGV[0] or die "Cannot open $ARGV[0]: $!\n";
binmode EXE;
# read IMAGE_DOS_HEADER structure
read EXE, $record, 64;
($magic,$offset) = unpack "Sx58L", $record;
die "$ARGV[0] is not an MSDOS executable file.\n"
unless $magic == 0x5a4d; # "MZ"
# read signature, IMAGE_FILE_HEADER and first WORD of IMAGE_OPTIONAL_HEADER
seek EXE, $offset, 0;
read EXE, $record, 4+20+2;
($signature,$size,$magic) = unpack "Lx16Sx2S", $record;
die "PE header not found" unless $signature == 0x4550; # "PE\0\0"
die "Optional header is neither in NT32 nor in NT64 format"
unless ($size == 224 && $magic == 0x10b) || # IMAGE_NT_OPTIONAL_HDR32_MAGIC
($size == 240 && $magic == 0x20b); # IMAGE_NT_OPTIONAL_HDR64_MAGIC
# Offset 68 in the IMAGE_OPTIONAL_HEADER(32|64) is the 16 bit subsystem code
seek EXE, $offset+4+20+68, 0;
if (@ARGV == 1) {
read EXE, $record, 2;
my ($subsys) = unpack "S", $record;
$subsys = {reverse %subsys}->{$subsys} || "UNKNOWN($subsys)";
print "$ARGV[0] uses the $subsys subsystem.\n";
}
else {
print EXE pack "S", $subsys{$ARGV[1]};
}
close EXE;
__END__
=head1 NAME
exetype - Change executable subsystem type between "Console" and "Windows"
=head1 SYNOPSIS
C:\perl\bin> copy perl.exe guiperl.exe
C:\perl\bin> exetype guiperl.exe windows
=head1 DESCRIPTION
This program edits an executable file to indicate which subsystem the
operating system must invoke for execution.
You can specify any of the following subsystems:
=over
=item CONSOLE
The CONSOLE subsystem handles a Win32 character-mode application that
use a console supplied by the operating system.
=item WINDOWS
The WINDOWS subsystem handles an application that does not require a
console and creates its own windows, if required.
=item NATIVE
The NATIVE subsystem handles a Windows NT device driver.
=item WINDOWSCE
The WINDOWSCE subsystem handles Windows CE consumer electronics
applications.
=item POSIX
The POSIX subsystem handles a POSIX application in Windows NT.
=back
=head1 AUTHOR
Jan Dubois <jand@activestate.com>
=cut
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