root/src/vfs/extfs/helpers/mailfs.in

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#! @PERL@
 
use bytes;
use warnings;
 
# MC extfs for (possibly compressed) Berkeley style mailbox files
# Peter Daum <gator@cs.tu-berlin.de> (Jan 1998, mc-4.1.24)
 
$zcat="zcat";                 # gunzip to stdout
$bzcat="bzip2 -dc";           # bunzip2 to stdout
$lzipcat="lzip -dc";          # unlzip to stdout
$lz4cat="lz4 -dc";            # unlz4 to stdout
$lzcat="lzma -dc";            # unlzma to stdout
$lzocat="lzop -dc";           # unlzo to stdout
$xzcat="xz -dc";              # unxz to stdout
$zstdcat="zstd -dc";          # unzstd to stdout
$file="file";                 # "file" command
$TZ='GMT';                    # default timezone (for Date module)
 
if (eval "require Date::Parse") {
    import Date::Parse;
    $parse_date=
        sub {
            local $ftime = str2time($_[0],$TZ);
            $_ = localtime($ftime);
            /^(...) (...) ([ \d]\d) (\d\d:\d\d):\d\d (\d\d\d\d)$/;
            if ($ftime + 6 * 30 * 24 * 60 * 60 < $now ||
                $ftime + 60 * 60 > $now) {
                return "$2 $3 $5";
            } else {
                return "$2 $3 $4";
            }
        }
} elsif (eval "require Date::Manip") {
    import Date::Manip;
    $parse_date=
        sub {
            return UnixDate($_[0], "%l"); # "ls -l" format
        }
} else {                        # use "light" version
    $parse_date= sub {
        local $mstring='GeeJanFebMarAprMayJunJulAugSepOctNovDec';
        # assumes something like: Mon, 5 Jan 1998 16:08:19 +0200 (GMT+0200)
        # if you have mails with another date format, add it here
        if (/(\d\d?) ([A-Z][a-z][a-z]) (\d\d\d\d) (\d\d?):(\d\d)/) {
            $day = $1;
            $month = $2;
            $mon = index($mstring,$month) / 3;
            $year = $3;
            $hour = $4;
            $min = $5;
            # pass time not year for files younger than roughly 6 months
            # but not for files with dates more than 1-2 hours in the future
            if ($year * 12 + $mon > $thisyear * 12 + $thismon - 7 &&
                $year * 12 + $mon <= $thisyear * 12 + $thismon &&
                ! (($year * 12 + $mon) * 31 + $day ==
                ($thisyear * 12 + $thismon) * 31 + $thisday &&
                $hour > $thishour + 2)) {
                return "$month $day $hour:$min";
            } else {
                return "$month $day $year";
            }
        }
        # Y2K bug.
        # Date: Mon, 27 Mar 100 16:30:47 +0000 (GMT)
        if (/(\d\d?) ([A-Z][a-z][a-z]) (1?\d\d) (\d\d?):(\d\d)/) {
            $day = $1;
            $month = $2;
            $mon = index($mstring,$month) / 3;
            $year = 1900 + $3;
            $hour = $4;
            $min = $5;
            if ($year < 1970) {
                $year += 100;
            }
            if ($year * 12 + $mon > $thisyear * 12 + $thismon - 7 &&
                $year * 12 + $mon <= $thisyear * 12 + $thismon &&
                ! (($year * 12 + $mon) * 31 + $day ==
                ($thisyear * 12 + $thismon) * 31 + $thisday &&
                $hour > $thishour + 2)) {
                return "$month $day $hour:$min";
            } else {
                return "$month $day $year";
            }
        }
        # AOLMail(SM).
        # Date: Sat Jul 01 10:06:06 2000
        if (/([A-Z][a-z][a-z]) (\d\d?) (\d\d?):(\d\d)(:\d\d)? (\d\d\d\d)/) {
            $month = $1;
            $mon = index($mstring,$month) / 3;
            $day = $2;
            $hour = $3;
            $min = $4;
            $year = $6;
            if ($year * 12 + $mon > $thisyear * 12 + $thismon - 7 &&
                $year * 12 + $mon <= $thisyear * 12 + $thismon &&
                ! (($year * 12 + $mon) * 31 + $day ==
                ($thisyear * 12 + $thismon) * 31 + $thisday &&
                $hour > $thishour + 2)) {
                return "$month $day $hour:$min";
            } else {
                return "$month $day $year";
            }
        }
        # Fallback
        return $fallback;
    }
}
 
sub process_header {
    while (<IN>) {
        $size+=length;
        s/\r$//;
        last if /^$/;
        die "unexpected EOF\n" if eof;
        if (/^date:\s(.*)$/i) {
            $date=&$parse_date($1);
        } elsif (/^subject:\s(.*)$/i) {
            $subj=lc($1);
            $subj=~ s/^(re:\s?)+//gi;  # no leading Re:
            $subj=~ tr/a-zA-Z0-9//cd; # strip all "special" characters
        } elsif (/^from:\s.*?(\w+)\@/i) {
            $from=$1;
        } elsif (/^to:\s.*?(\w+)\@/i) {
            $to=lc($1);
        }
    }
}
 
sub print_dir_line {
    $from=$to if ($from eq $user); # otherwise, it would look pretty boring
    $date=localtime(time) if (!defined $date);
    printf "-r-------- 1 $< $< %d %s %3.3d_%.25s\n",
    $size, $date, $msg_nr, "${from}_${subj}";
 
}
 
sub mailfs_list {
    my $blank = 1;
    $user=$ENV{USER}||getlogin||getpwuid($<) || "nobody";
 
    while(<IN>) {
        s/\r$//;
        if($blank && /^from\s+\w+(\.\w+)*@/i) { # Start of header
            print_dir_line unless (!$msg_nr);
            $size=length;
            $msg_nr++;
            ($from,$to,$subj,$date)=("none","none","none", "01-01-80");
            process_header;
            $line=$blank=0;
        } else {
            $size+=length;
            $line++;
            $blank= /^$/;
        }
    }
    print_dir_line unless (!$msg_nr);
    exit 0;
}
 
sub mailfs_copyout {
    my($source,$dest)=@_;
    exit 1 unless (open STDOUT, ">$dest");
    ($nr)= ($source =~ /^(\d+)/); # extract message number from "filename"
 
    my $blank = 1;
    while(<IN>) {
        s/\r$//;
        if($blank && /^from\s+\w+(\.\w+)*@/i) {
            $msg_nr++;
            exit(0) if ($msg_nr > $nr);
            $blank= 0;
        } else {
            $blank= /^$/;
        }
        print if ($msg_nr == $nr);
    }
}
 
# main {
exit 1 unless ($#ARGV >= 1);
$msg_nr=0;
$cmd=shift;
$mbox_name=shift;
my $mbox_qname = quotemeta ($mbox_name);
$_=`$file $mbox_qname`;
 
if (/gzip/) {
    exit 1 unless (open IN, "$zcat $mbox_qname|");
} elsif (/bzip/) {
    exit 1 unless (open IN, "$bzcat $mbox_qname|");
} elsif (/lzip/) {
    exit 1 unless (open IN, "$lzipcat $mbox_qname|");
} elsif (/lz4/) {
    exit 1 unless (open IN, "$lz4cat $mbox_qname|");
} elsif (/lzma/) {
    exit 1 unless (open IN, "$lzcat $mbox_qname|");
} elsif (/lzo/) {
    exit 1 unless (open IN, "$lzocat $mbox_qname|");
} elsif (/xz/) {
    exit 1 unless (open IN, "$xzcat $mbox_qname|");
} elsif (/zst/) {
    exit 1 unless (open IN, "$zstdcat $mbox_qname|");
} else {
    exit 1 unless (open IN, "<$mbox_name");
}
 
umask 077;
 
if($cmd eq "list") {
    $now = time;
    $_ = localtime($now);
    /^... (... [ \d]\d \d\d:\d\d):\d\d \d\d\d\d$/;
    $fallback = $1;
    $nowstring=`date "+%Y %m %d %H"`;
    ($thisyear, $thismon, $thisday, $thishour) = split(/ /, $nowstring);
    &mailfs_list;
    exit 0;
}
elsif($cmd eq "copyout") { &mailfs_copyout(@ARGV); exit 0; }
 
exit 1;
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