# 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/A.pm#17 $

## Package to read/write on ASCII data connections

##

package Net::FTP::A;

use strict;

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

use Carp;

require Net::FTP::dataconn;

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

$VERSION = "1.16";

sub read {

  my    $data 	 = shift;

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

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

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

  if (length(${*$data}) < $size && !${*$data}{'net_ftp_eof'}) {

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

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

    my $l = 0;

    my $n;

    READ:

    {

      my $readbuf = defined(${*$data}{'net_ftp_cr'}) ? "\015" : '';

      $data->can_read($timeout) or

	   croak "Timeout";

      if ($n = sysread($data, $readbuf, $blksize, length $readbuf)) {

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

	${*$data}{'net_ftp_cr'} = substr($readbuf,-1) eq "\015"

					? chop($readbuf)

					: undef;

      }

      else {

        return undef

	  unless defined $n;

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

      }

      $readbuf =~ s/\015\012/\n/sgo;

      ${*$data} .= $readbuf;

      unless (length(${*$data})) {

        redo READ

	  if($n > 0);

        $size = length(${*$data})

          if($n == 0);

      }

    }

  }

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

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

  length $buf;

}

sub write {

  my    $data 	= shift;

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

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

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

  (my $tmp = substr($buf,0,$size)) =~ s/\r?\n/\015\012/sg;

  # 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 $len = length($tmp);

  my $off = 0;

  my $wrote = 0;

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

  while($len) {

    $data->can_write($timeout) or

	 croak "Timeout";

    $off += $wrote;

    $wrote = syswrite($data, substr($tmp,$off), $len > $blksize ? $blksize : $len);

    return undef

      unless defined($wrote);

    $len -= $wrote;

  }

  $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