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#! /usr/bin/perl
#
# Copyright (C) Heinz-Josef Claes (2009-2022)
# hjclaes@web.de
#
# This program 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 3 of the License, or
# (at your option) any later version.
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
#
use Fcntl;
use Digest::MD5 qw(md5_hex);
use POSIX;
use POSIX ":sys_wait_h";
# $0 comprProg fileToRead fileToSave md5RetFile
# ret:
# 0 ok
# 1 cannot open fileToRead
# 2 cannot exec comprProg
# 3 cannot write md5sum
my ($comprProg, $fileToRead, $fileToSave, $md5RetFile, $tmpdir,
@comprProgFlags) = @ARGV;
unless (sysopen(IN, $fileToRead, O_RDONLY))
{
print STDERR "cannot open <$fileToRead> (", __FILE__, " ", __LINE__, ")\n";
exit 1;
}
my $prefix = "$tmpdir/stbu-md5Exec-";
my $suffix;
do
{
$suffix = sprintf '%08x%08x', rand 0xffffffff, rand 0xffffffff;
}
while (-e $prefix . $suffix);
my $stderr = $prefix . $suffix;
local *PARENT;
my $fd = *PARENT;
my $child;
pipe $child, $fd or die "pipe failed: $!";
my $pid = fork();
die "fork() failed: $!" unless defined $pid;
if ($pid == 0) # in the parent
{
close $Child;
}
elsif ($pid < 0)
{
die "failed to fork in $0\n";
}
else # in the child
{
close PARENT;
open(STDERR, ">", $stderr)
or die "cannot open STDERR";
open(STDIN, "<&=" . fileno($child))
or die "cannot open STDIN";
open(STDOUT, ">", $fileToSave)
or die "cannot open STDOUT";
exec($comprProg, @comprProgFlags);
die "couldn't exec $comprProg @comprProgFlags";
}
chmod 0700, $fileToSave;
if (-s $stderr) # file exists and is > 0
{
open(ERR, "<", $stderr)
or print STDERR "cannot open <$stderr> in $0";
my (@err) = <ERR>;
close(ERR);
print STDERR "@err";
}
unlink $stderr;
my $md5 = Digest::MD5->new();
my ($buffer, $n, $size);
$size = 0;
while ($n = sysread(IN, $buffer, 4096))
{
print STDERR "cannot write to <$fileToSave>\n"
unless syswrite $fd, $buffer;
$md5->add($buffer);
$size += $n;
}
close($fd);
close(IN);
waitpid $pid, 0;
unless (open(MD5, '>', $md5RetFile))
{
print STDERR "cannot write to <$md5RetFile>\n";
exit 3;
}
print MD5 $md5->hexdigest(), "\n$size\n";
close(MD5);
exit 0;
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