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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);
# $0 comprProg fileToRead fileToSave md5RetFile
# ret:
# 0 ok
# 1 cannot open fileToRead
# 2 cannot exec comprProg
# 3 cannot write md5sum
my ($fileToRead, $fileToSave, $md5RetFile) = @ARGV;
unless (sysopen(IN, $fileToRead, O_RDONLY))
{
print STDERR "cannot open <$fileToRead> (", __FILE__, " ", __LINE__, ")\n";
exit 1;
}
unless (sysopen(OUT, $fileToSave, O_CREAT|O_WRONLY, 0700))
{
print STDERR "cannot open <$fileToSave> (", __FILE__, " ", __LINE__, ")\n";
exit 2;
}
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 OUT, $buffer;
$md5->add($buffer);
$size += $n;
}
close(OUT);
close(IN);
open(MD5, '>', $md5RetFile)
or exit 3;
print MD5 $md5->hexdigest(), "\n$size\n";
close(MD5);
exit 0;
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