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|
package STSupport;
require Exporter;
use File::Compare;
@ISA = qw(Exporter);
@EXPORT = qw(
DATADIR RND100
getArgString
startCategory endCategory startSubCategory endSubCategory addTestResult
runEmbExtCmp
);
#
# set this to 1 if you want the test script to print verbose output
#
$Arg_Verbosity = 0 ;
$curcategory = "";
$catstatus = 0 ;
$cursubcategory = "";
$subcatstatus = 0 ;
use constant DATADIR => "./data/" ;
use constant RND100 => "rnd100" ;
use constant TAB => " " ;
use constant STEGHIDE => "../src/steghide" ;
use constant DEFAULTSTGFN => "stgfile" ;
use constant DEFAULTEXTFN => "extfile" ;
use constant DEFEMBARGBASE => (command => "embed", f => "", "q" => "", p => "\"a passphrase\"", sf => DEFAULTSTGFN) ;
use constant DEFEXTARGBASE => (command => "extract", f => "", "q" => "", p => "\"a passphrase\"", sf => DEFAULTSTGFN, xf => DEFAULTEXTFN) ;
#
# parse arguments for a st_*.pl script
#
sub parseArgs {
while (@_) {
$ARGV = shift @_ ;
if ($ARGV eq "-v" || $ARGV eq "--verbose") {
$Arg_Verbosity = 1 ;
}
}
}
#
# create a string of arguments ready to be fed to steghide
# expects a hash containing a "command" => "something" and argument/argument value pairs
#
sub getArgString {
my %args = @_ ;
$retval = $args{command} ;
delete $args{command} ;
foreach $arg (keys %args) {
$retval .= " -$arg $args{$arg}" ;
}
return $retval ;
}
#
# start a category
# first argument: category name, rest of list: arguments for execution of this category script
#
sub startCategory {
$curcategory = shift @_ ;
parseArgs (@_) ;
print "$curcategory:\n" ;
$catstatus = 1 ;
}
#
#
# return value: 1 if an error occurred, 0 if everything was ok
sub endCategory {
$curcategory = "" ;
print "\n" ;
if ($catstatus) { # no error
return 0 ;
}
else { # an error occurred
return 1 ;
}
}
sub startSubCategory {
$cursubcategory = $_[0] ;
print TAB . $cursubcategory ;
$subcatstatus = 1 ;
}
sub endSubCategory {
$cursubcategory = "" ;
if ($subcatstatus) {
print "ok\n" ;
}
else {
print " !! FAILED !!\n" ;
}
}
sub addTestResult {
if ($_[0]) {
print ".";
}
else {
print "F";
$subcatstatus = 0 ;
$catstatus = 0 ;
}
}
#
# remove all files in the list passed to it
sub remove {
while (@_) {
$f = shift @_ ;
system "rm -f $f" ;
}
}
#
# run an embed-extract-compare test
# expects 1-4 arguments: cvrfn, embfn, callerembargs, callerextargs
sub runEmbExtCmp {
if ($Arg_Verbosity) {
print "\n\nrunning EmbExtCmp with...\n" ;
}
# evaluate arguments
$cvrfn = shift @_ ;
$embfn = DATADIR . RND100 ; # default
if (@_) { $embfn = shift @_ ; }
%callerembargs = () ;
if (@_) {
$ref = shift @_ ;
%callerembargs = %$ref ;
}
%callerextargs = () ;
if (@_) {
$ref = shift @_ ;
%callerextargs = %$ref ;
}
# prepare embedding
%embargs = (
DEFEMBARGBASE,
cf => $cvrfn,
ef => $embfn,
%callerembargs
) ;
$embcommand = STEGHIDE . " " . getArgString(%embargs) ;
# prepare extracting
%extargs = (
DEFEXTARGBASE,
%callerextargs
) ;
$extcommand = STEGHIDE . " " . getArgString(%extargs) ;
if ($Arg_Verbosity) {
print "embcommand: $embcommand\n" ;
print "extcommand: $extcommand\n" ;
}
# execute commands
`$embcommand 2>&1` ; # don't let it print to stderr or stdout
return 0 if $? ;
`$extcommand 2>&1` ; # don't let it print to stderr or stdout
return 0 if $? ;
# compare embfile and extfile
$filesequal = not compare ($embargs{ef}, $extargs{xf}) ;
remove ($embargs{sf}, $extargs{xf}) ;
return $filesequal ;
}
1;
|
