# COPYRIGHT 1996-2000 Graham Barr. All rights reserved.

#

# This library is free software; you can redistribute it and/or modify

# it under the same terms as Perl itself.

## $Id: //depot/libnet/Net/FTP/I.pm#13 $

## Package to read/write on BINARY data connections

##

package Net::FTP::I;

use vars qw(@ISA $buf $VERSION);

use Carp;

require Net::FTP::dataconn;

@ISA = qw(Net::FTP::dataconn);

$VERSION = "1.12"; 

sub read {

  my    $data 	 = shift;

  local *buf 	 = \$_[0]; shift;

  my    $size    = shift || croak 'read($buf,$size,[$timeout])';

  my    $timeout = @_ ? shift : $data->timeout;

  my $n;

  if ($size > length ${*$data} and !${*$data}{'net_ftp_eof'}) {

    $data->can_read($timeout) or

	   croak "Timeout";

    my $blksize = ${*$data}{'net_ftp_blksize'};

    $blksize = $size if $size > $blksize;

    unless ($n = sysread($data, ${*$data}, $blksize, length ${*$data})) {

      return undef unless defined $n;

      ${*$data}{'net_ftp_eof'} = 1;

    }

  }

  $buf = substr(${*$data},0,$size);

  $n = length($buf);

  substr(${*$data},0,$n) = '';

  ${*$data}{'net_ftp_bytesread'} += $n;

  $n;

}

sub write {

  my    $data    = shift;

  local *buf     = \$_[0]; shift;

  my    $size    = shift || croak 'write($buf,$size,[$timeout])';

  my    $timeout = @_ ? shift : $data->timeout;

  # If the remote server has closed the connection we will be signal'd

  # when we write. This can happen if the disk on the remote server fills up

  local $SIG{PIPE} = 'IGNORE' unless $^O eq 'MacOS';

  my $sent = $size;

  my $off = 0;

  my $blksize = ${*$data}{'net_ftp_blksize'};

  while($sent > 0) {

    $data->can_write($timeout) or

	 croak "Timeout";

    my $n = syswrite($data, $buf, $sent > $blksize ? $blksize : $sent ,$off);

    return undef unless defined($n);

    $sent -= $n;

    $off += $n;

  }

  $size;

}

1;

__END__

=head1 COPYRIGHT

COPYRIGHT

  © 1996-2000 Graham Barr. All rights reserved.

This library is free software; you can redistribute it and/or modify

it under the same terms as Perl itself.

=cut