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一个支持http续传下载的perl程序
#!/usr/bin/perl
use io::socket;
if ($#argv <= 0) {
print stderr "usage: getright <url> <filename>\n\n";
print stderr " <url>: eg. http://www.server.dom:port/path/file.ext\n";
print stderr "<filename>: eg. filename.ext\n";
exit(0);
} else {
open(file, "+>>".$argv[1]) or die "cannot open $argv[1] for append: $!";
($length = sysseek(file,0,2)) =~ s!.*([0-9]+).*!$1!g;
print stderr "attempting to resume $argv[1] from byte: $length\n";
}
if ($argv[0] =~ m!^ (?:http://)? (.*?) (?:\:([0-9]+))? (/.*)$!x)
{ ($server,$port,$path) = ($1, $2 80, $3); }
print "[$server] [$port] [$path]\n";
$socket = io::socket::.net->new(peeraddr => $server,
peerport => $port,
proto => 'tcp',
type => sock_stream) or die "cannot connect: $!";
print $socket "get $path http/1.0\n";
print $socket "host: $server\n";
print $socket "range: bytes=$length-\n";
print $socket "connection: close\n\n";
if (!(($reply = <$socket>) =~ /http\/1.[01] 206 partial content/)) {
$reply =~ s!(.*)\r\n!$1!;
print stderr "failed [$reply]\n";
print stderr "invalid url/unrecognized reply/resume not supported.\n";
close($socket); exit(0);
} else {
print stderr "received valid http reply.\n";
}
while (($mime = <$socket>) =~ /\w+: /) {
if ($mime =~ /content\-range\:\sbytes\s([0-9]+)\-([0-9]+)\/([0-9]+)/)
{ ($start,$finish,$filesize) = ($1, $2, $3); }
if ($mime =~ /content\-length\:\s([0-9]+)/) { $total = $1; }
}
print stderr "receiving data: ";
while ($data = <$socket>) {
$recieved += length($data);
$percentage= int((($start+$recieved) / $filesize) * 100);
print stderr $percentage."%"."\b"x(length($percentage)+1);
print file $data;
}
print stderr "100%\n";
close(file);
close($socket);
# example http return header:
#
# http/1.1 206 partial content
# date: wed, 15 nov 1995 06:25:24 gmt
# last-modified: wed, 15 nov 1995 04:58:08 gmt
# content-range: bytes 21010-47021/47022
# content-length: 26012
# content-type: image/gif
