listing.pm

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

package File::Listing;

# $Id: Listing.pm,v 1.15 2003/10/26 14:24:22 gisle Exp $

sub Version { $VERSION; }
$VERSION = sprintf("%d.%02d", q$Revision: 1.15 $ =~ /(\d+)\.(\d+)/);

require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(parse_dir);

use strict;

use Carp ();
use HTTP::Date qw(str2time);



sub parse_dir ($;$$$)
{
   my($dir, $tz, $fstype, $error) = @_;

   $fstype ||= 'unix';
   $fstype = "File::Listing::" . lc $fstype;

   my @args = $_[0];
   push(@args, $tz) if(@_ >= 2);
   push(@args, $error) if(@_ >= 4);

   $fstype->parse(@args);
}


sub line { Carp::croak("Not implemented yet"); }
sub init { } # Dummy sub


sub file_mode ($)
{
    # This routine was originally borrowed from Graham Barr's
    # Net::FTP package.

    local $_ = shift;
    my $mode = 0;
    my($type,$ch);

    s/^(.)// and $type = $1;

    while (/(.)/g) {
	$mode <<= 1;
	$mode |= 1 if $1 ne "-" &&
		      $1 ne 'S' &&
		      $1 ne 't' &&
		      $1 ne 'T';
    }

    $type eq "d" and $mode |= 0040000 or	# Directory
      $type eq "l" and $mode |= 0120000 or	# Symbolic Link
	$mode |= 0100000;			# Regular File

    $mode |= 0004000 if /^...s....../i;
    $mode |= 0002000 if /^......s.../i;
    $mode |= 0001000 if /^.........t/i;

    $mode;
}


sub parse
{
   my($pkg, $dir, $tz, $error) = @_;

   # First let's try to determine what kind of dir parameter we have
   # received.  We allow both listings, reference to arrays and
   # file handles to read from.

   if (ref($dir) eq 'ARRAY') {
       # Already splitted up
   }
   elsif (ref($dir) eq 'GLOB') {
       # A file handle
   }
   elsif (ref($dir)) {
      Carp::croak("Illegal argument to parse_dir()");
   }
   elsif ($dir =~ /^\*\w+(::\w+)+$/) {
      # This scalar looks like a file handle, so we assume it is
   }
   else {
      # A normal scalar listing
      $dir = [ split(/\n/, $dir) ];
   }

   $pkg->init();

   my @files = ();
   if (ref($dir) eq 'ARRAY') {
       for (@$dir) {
	   push(@files, $pkg->line($_, $tz, $error));
       }
   }
   else {
       local($_);
       while (<$dir>) {
	   chomp;
	   push(@files, $pkg->line($_, $tz, $error));
       }
   }
   wantarray ? @files : \@files;
}



package File::Listing::unix;

use HTTP::Date qw(str2time);

# A place to remember current directory from last line parsed.
use vars qw($curdir);
no strict qw(vars);

@ISA = qw(File::Listing);



sub init
{
    $curdir = '';
}


sub line
{
    shift; # package name
    local($_) = shift;
    my($tz, $error) = @_;

    s/\015//g;
    #study;

    my ($kind, $size, $date, $name);
    if (($kind, $size, $date, $name) =
	/^([\-FlrwxsStTdD]{10})                   # Type and permission bits
	 .*                                       # Graps
	 \D(\d+)                                  # File size
	 \s+                                      # Some space
	 (\w{3}\s+\d+\s+(?:\d{1,2}:\d{2}|\d{4}))  # Date
	 \s+                                      # Some more space
	 (.*)$                                    # File name
	/x )

    {
	return if $name eq '.' || $name eq '..';
	$name = "$curdir/$name" if length $curdir;
	my $type = '?';
	if ($kind =~ /^l/ && $name =~ /(.*) -> (.*)/ ) {
	    $name = $1;
	    $type = "l $2";
	}
	elsif ($kind =~ /^[\-F]/) { # (hopefully) a regular file
	    $type = 'f';
	}
	elsif ($kind =~ /^[dD]/) {
	    $type = 'd';
	    $size = undef;  # Don't believe the reported size
	}
	return [$name, $type, $size, str2time($date, $tz), 
              File::Listing::file_mode($kind)];

    }
    elsif (/^(.+):$/ && !/^[dcbsp].*\s.*\s.*:$/ ) {
	my $dir = $1;
	return () if $dir eq '.';
	$curdir = $dir;
	return ();
    }
    elsif (/^[Tt]otal\s+(\d+)$/ || /^\s*$/) {
	return ();
    }
    elsif (/not found/    || # OSF1, HPUX, and SunOS return
             # "$file not found"
             /No such file/ || # IRIX returns
             # "UX:ls: ERROR: Cannot access $file: No such file or directory"
                               # Solaris returns
             # "$file: No such file or directory"
             /cannot find/     # Windows NT returns
             # "The system cannot find the path specified."
             ) {
	return () unless defined $error;
	&$error($_) if ref($error) eq 'CODE';
	warn "Error: $_\n" if $error eq 'warn';
	return ();
    }
    elsif ($_ eq '') {       # AIX, and Linux return nothing
	return () unless defined $error;
	&$error("No such file or directory") if ref($error) eq 'CODE';
	warn "Warning: No such file or directory\n" if $error eq 'warn';
	return ();
    }
    else {
        # parse failed, check if the dosftp parse understands it
        return(File::Listing::dosftp->line($_,$tz,$error));
    }

}



package File::Listing::dosftp;

use HTTP::Date qw(str2time);

# A place to remember current directory from last line parsed.
use vars qw($curdir);
no strict qw(vars);

@ISA = qw(File::Listing);



sub init
{
    $curdir = '';
}


sub line
{
    shift; # package name
    local($_) = shift;
    my($tz, $error) = @_;

    s/\015//g;

    my ($kind, $size, $date, $name);

    # 02-05-96  10:48AM                 1415 src.slf
    # 09-10-96  09:18AM       <DIR>          sl_util
    if (($date,$size_or_dir,$name) =
        /^(\d\d-\d\d-\d\d\s+\d\d:\d\d\wM)         # Date and time info
         \s+                                      # Some space
         (<\w{3}>|\d+)                            # Dir or Size
         \s+                                      # Some more space
         (.+)$                                    # File name
        /x )
    {
	return if $name eq '.' || $name eq '..';
	$name = "$curdir/$name" if length $curdir;
	my $type = '?';
	if ($size_or_dir eq '<DIR>') {
	    $type = "d";
            $size = ""; # directories have no size in the pc listing
        }
        else {
	    $type = 'f';
            $size = $size_or_dir;
	}
	return [$name, $type, $size, str2time($date, $tz),
              File::Listing::file_mode($kind)];

    }
    else {
	return () unless defined $error;
	&$error($_) if ref($error) eq 'CODE';
	warn "Can't parse: $_\n" if $error eq 'warn';
	return ();
    }

}



package File::Listing::vms;
@File::Listing::vms::ISA = qw(File::Listing);

package File::Listing::netware;
@File::Listing::netware::ISA = qw(File::Listing);



package File::Listing::apache;

@ISA = qw(File::Listing);


sub init { }


sub line {
    shift; # package name
    local($_) = shift;
    my($tz, $error) = @_; # ignored for now...

    if (m!<A\s+HREF=\"([^\"]+)\">.*</A>.*?(\d+)-([a-zA-Z]+)-(\d+)\s+(\d+):(\d+)\s+(?:([\d\.]+[kM]?|-))!i) {
	my($filename, $filesize) = ($1, $7);
	my($d,$m,$y, $H,$M) = ($2,$3,$4,$5,$6);

	$filesize = 0 if $filesize eq '-';
	if ($filesize =~ s/k$//i) {
	    $filesize *= 1024;
	}
	elsif ($filesize =~ s/M$//) {
	    $filesize *= 1024*1024;
	}
	elsif ($filesize =~ s/G$//) {
	    $filesize *= 1024*1024*1024;
	}
	$filesize = int $filesize;

	require Time::Local;
	my $filetime = Time::Local::timelocal(0,$M,$H,$d,_monthabbrev_number($m)-1,_guess_year($y)-1900);
	my $filetype = ($filename =~ s|/$|| ? "d" : "f");
	return [$filename, $filetype, $filesize, $filetime, undef];
    }

    return ();
}


sub _guess_year {
    my $y = shift;
    if ($y >= 90) {
	$y = 1900+$y;
    }
    elsif ($y < 100) {
	$y = 2000+$y;
    }
    $y;
}


sub _monthabbrev_number {
    my $mon = shift;
    +{'Jan' => 1,
      'Feb' => 2,
      'Mar' => 3,
      'Apr' => 4,
      'May' => 5,
      'Jun' => 6,
      'Jul' => 7,
      'Aug' => 8,
      'Sep' => 9,
      'Oct' => 10,
      'Nov' => 11,
      'Dec' => 12,
     }->{$mon};
}


1;

__END__

=head1 NAME

File::Listing - parse directory listing

=head1 SYNOPSIS

 use File::Listing qw(parse_dir);
 for (parse_dir(`ls -l`)) {
     ($name, $type, $size, $mtime, $mode) = @$_;
     next if $type ne 'f'; # plain file
     #...
 }

 # directory listing can also be read from a file
 open(LISTING, "zcat ls-lR.gz|");
 $dir = parse_dir(\*LISTING, '+0000');

=head1 DESCRIPTION

This module exports a single function called parse_dir(), which can be
used to parse directory listings. Currently it only understand Unix
C<'ls -l'> and C<'ls -lR'> format.  It should eventually be able to
most things you might get back from a ftp server file listing (LIST
command), i.e. VMS listings, NT listings, DOS listings,...

The first parameter to parse_dir() is the directory listing to parse.
It can be a scalar, a reference to an array of directory lines or a
glob representing a filehandle to read the directory listing from.

The second parameter is the time zone to use when parsing time stamps
in the listing. If this value is undefined, then the local time zone is
assumed.

The third parameter is the type of listing to assume.  The values will
be strings like 'unix', 'vms', 'dos'.  Currently only 'unix' is
implemented and this is also the default value.  Ideally, the listing
type should be determined automatically.

The fourth parameter specifies how unparseable lines should be treated.
Values can be 'ignore', 'warn' or a code reference.  Warn means that
the perl warn() function will be called.  If a code reference is
passed, then this routine will be called and the return value from it
will be incorporated in the listing.  The default is 'ignore'.

Only the first parameter is mandatory.

The return value from parse_dir() is a list of directory entries.  In
a scalar context the return value is a reference to the list.  The
directory entries are represented by an array consisting of [
$filename, $filetype, $filesize, $filetime, $filemode ].  The
$filetype value is one of the letters 'f', 'd', 'l' or '?'.  The
$filetime value is the seconds since Jan 1, 1970.  The
$filemode is a bitmask like the mode returned by stat().

=head1 CREDITS

Based on lsparse.pl (from Lee McLoughlin's ftp mirror package) and
Net::FTP's parse_dir (Graham Barr).