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   1  ## 
   2  ## Package to read/write on BINARY data connections
   3  ##
   4  
   5  package Net::FTP::I;
   6  
   7  use vars qw(@ISA $buf $VERSION);
   8  use Carp;
   9  
  10  require Net::FTP::dataconn;
  11  
  12  @ISA     = qw(Net::FTP::dataconn);
  13  $VERSION = "1.12";
  14  
  15  
  16  sub read {
  17    my $data = shift;
  18    local *buf = \$_[0];
  19    shift;
  20    my $size = shift || croak 'read($buf,$size,[$timeout])';
  21    my $timeout = @_ ? shift: $data->timeout;
  22  
  23    my $n;
  24  
  25    if ($size > length ${*$data} and !${*$data}{'net_ftp_eof'}) {
  26      $data->can_read($timeout)
  27        or croak "Timeout";
  28  
  29      my $blksize = ${*$data}{'net_ftp_blksize'};
  30      $blksize = $size if $size > $blksize;
  31  
  32      unless ($n = sysread($data, ${*$data}, $blksize, length ${*$data})) {
  33        return undef unless defined $n;
  34        ${*$data}{'net_ftp_eof'} = 1;
  35      }
  36    }
  37  
  38    $buf = substr(${*$data}, 0, $size);
  39  
  40    $n = length($buf);
  41  
  42    substr(${*$data}, 0, $n) = '';
  43  
  44    ${*$data}{'net_ftp_bytesread'} += $n;
  45  
  46    $n;
  47  }
  48  
  49  
  50  sub write {
  51    my $data = shift;
  52    local *buf = \$_[0];
  53    shift;
  54    my $size = shift || croak 'write($buf,$size,[$timeout])';
  55    my $timeout = @_ ? shift: $data->timeout;
  56  
  57    # If the remote server has closed the connection we will be signal'd
  58    # when we write. This can happen if the disk on the remote server fills up
  59  
  60    local $SIG{PIPE} = 'IGNORE'
  61      unless ($SIG{PIPE} || '') eq 'IGNORE'
  62      or $^O eq 'MacOS';
  63    my $sent = $size;
  64    my $off  = 0;
  65  
  66    my $blksize = ${*$data}{'net_ftp_blksize'};
  67    while ($sent > 0) {
  68      $data->can_write($timeout)
  69        or croak "Timeout";
  70  
  71      my $n = syswrite($data, $buf, $sent > $blksize ? $blksize : $sent, $off);
  72      return undef unless defined($n);
  73      $sent -= $n;
  74      $off += $n;
  75    }
  76  
  77    $size;
  78  }
  79  
  80  1;