1## $Id: //depot/libnet/Net/FTP/A.pm#17 $
2## Package to read/write on ASCII data connections
3##
4
5package Net::FTP::A;
6use strict;
7use vars qw(@ISA $buf $VERSION);
8use Carp;
9
10require Net::FTP::dataconn;
11
12@ISA = qw(Net::FTP::dataconn);
13$VERSION = "1.16";
14
15sub read {
16  my    $data 	 = shift;
17  local *buf 	 = \$_[0]; shift;
18  my    $size 	 = shift || croak 'read($buf,$size,[$offset])';
19  my    $timeout = @_ ? shift : $data->timeout;
20
21  if (length(${*$data}) < $size && !${*$data}{'net_ftp_eof'}) {
22    my $blksize = ${*$data}{'net_ftp_blksize'};
23    $blksize = $size if $size > $blksize;
24
25    my $l = 0;
26    my $n;
27
28    READ:
29    {
30      my $readbuf = defined(${*$data}{'net_ftp_cr'}) ? "\015" : '';
31
32      $data->can_read($timeout) or
33	   croak "Timeout";
34
35      if ($n = sysread($data, $readbuf, $blksize, length $readbuf)) {
36        ${*$data}{'net_ftp_bytesread'} += $n;
37	${*$data}{'net_ftp_cr'} = substr($readbuf,-1) eq "\015"
38					? chop($readbuf)
39					: undef;
40      }
41      else {
42        return undef
43	  unless defined $n;
44
45        ${*$data}{'net_ftp_eof'} = 1;
46      }
47
48      $readbuf =~ s/\015\012/\n/sgo;
49      ${*$data} .= $readbuf;
50
51      unless (length(${*$data})) {
52
53        redo READ
54	  if($n > 0);
55
56        $size = length(${*$data})
57          if($n == 0);
58      }
59    }
60  }
61
62  $buf = substr(${*$data},0,$size);
63  substr(${*$data},0,$size) = '';
64
65  length $buf;
66}
67
68sub write {
69  my    $data 	= shift;
70  local *buf 	= \$_[0]; shift;
71  my    $size 	= shift || croak 'write($buf,$size,[$timeout])';
72  my    $timeout = @_ ? shift : $data->timeout;
73
74  (my $tmp = substr($buf,0,$size)) =~ s/\r?\n/\015\012/sg;
75
76  # If the remote server has closed the connection we will be signal'd
77  # when we write. This can happen if the disk on the remote server fills up
78
79  local $SIG{PIPE} = 'IGNORE' unless $^O eq 'MacOS';
80
81  my $len = length($tmp);
82  my $off = 0;
83  my $wrote = 0;
84
85  my $blksize = ${*$data}{'net_ftp_blksize'};
86
87  while($len) {
88    $data->can_write($timeout) or
89	 croak "Timeout";
90
91    $off += $wrote;
92    $wrote = syswrite($data, substr($tmp,$off), $len > $blksize ? $blksize : $len);
93    return undef
94      unless defined($wrote);
95    $len -= $wrote;
96  }
97
98  $size;
99}
100
1011;
102