Linux 版 (精华区)
发信人: tcpip (俺的昵称改了), 信区: Linux
标 题: 用perl写的http断点续传程序
发信站: 哈工大紫丁香 (Fri Oct 22 14:58:22 1999), 转信
关于下载续传(resume),已经有很多软件都支持了。最简单的是在ftp这个客户端程序
中reget命 令就行;比较著名的是wget,同时支持ftp和http以及proxy,Redhat发行版中
已经包含了它。一个 比较简单的程序是snarf,写得很简明,可供一般的程序员参考。
另外有个人用perl写了个http续 传的脚本Get Right,收录在这儿供perl程序员参考.不
知是否有人在写类似NetAnts的分段下载的 软件?
----------------------
#!/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::INET->new(PeerAddr => $server,
PeerPort => $port,
Proto => 'tcp',
Type => SOCK_STREAM) or die "Cannot conne
ct: $!";
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
--
☆ 来源:.哈工大紫丁香 bbs.hit.edu.cn.[FROM: bin@mtlab.hit.edu.cn]
※ 修改:.tcpip 于 Oct 22 15:00:29 修改本文.[FROM: mtmail.hit.edu.c]
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