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Implement parallel download

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This commit is contained in:
Ivailo Hristov 2016-02-11 16:38:31 +02:00
parent b69fa7f2a9
commit 11a539bcbd
1 changed files with 58 additions and 27 deletions
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85
phpseclib/Net/SFTP.php
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@ -2064,39 +2064,70 @@ class SFTP extends SSH2
$start = $offset;
$size = $this->max_sftp_packet < $length || $length < 0 ? $this->max_sftp_packet : $length;
while (true) {
$packet = pack('Na*N3', strlen($handle), $handle, $offset / 4294967296, $offset, $size);
if (!$this->_send_sftp_packet(NET_SFTP_READ, $packet)) {
if ($fclose_check) {
fclose($fp);
}
return false;
}
$read = 0;
$error = false;
while (!$error) {
$request_id_offset = 5;// just like that, a random number
$i = $request_id_offset;
$response = $this->_get_sftp_packet();
switch ($this->packet_type) {
case NET_SFTP_DATA:
$temp = substr($response, 4);
$offset+= strlen($temp);
if ($local_file === false) {
$content.= $temp;
} else {
fputs($fp, $temp);
}
break;
case NET_SFTP_STATUS:
// could, in theory, return false if !strlen($content) but we'll hold off for the time being
$this->_logError($response);
break 2;
default:
// this puts a constraint on 32 bit systems where files larger than 4GB will not be completely downloaded if length is not specified.
$limit = $length > 0 ? max($this->max_sftp_packet, $length) : PHP_INT_MAX;
while ($i < NET_SFTP_QUEUE_SIZE+$request_id_offset && $read < $limit) {
$subtemp = $start + $read;
$possible_packet_sizes = array($this->max_sftp_packet, $size);
if ($limit - $read > 0) {
$possible_packet_sizes[] = $limit - $read;
}
$packet_size = min($possible_packet_sizes);
$packet = pack('Na*N3', strlen($handle), $handle, $subtemp / 4294967296, $subtemp, $packet_size);
$this->request_id = $i;
if (!$this->_send_sftp_packet(NET_SFTP_READ, $packet)) {
if ($fclose_check) {
fclose($fp);
}
throw new \UnexpectedValueException('Expected SSH_FXP_DATA or SSH_FXP_STATUS');
return false;
}
$this->request_id=1;
$read += $packet_size;
$i++;
}
if ($length > 0 && $length <= $offset - $start) {
break;
while ($i > $request_id_offset) {
$this->request_id = $i;
$response = $this->_get_sftp_packet();
$this->request_id=1;
switch ($this->packet_type) {
case NET_SFTP_DATA:
$temp = substr($response, 4);
$offset+= strlen($temp);
if ($local_file === false) {
$content.= $temp;
} else {
fputs($fp, $temp);
}
break;
case NET_SFTP_STATUS:
// could, in theory, return false if !strlen($content) but we'll hold off for the time being
$this->_logError($response);
// don't break out of the loop so we can read the remaining responses
$error = true;
break;
default:
if ($fclose_check) {
fclose($fp);
}
throw new \UnexpectedValueException('Expected SSH_FXP_DATA or SSH_FXP_STATUS');
}
if ($length > 0 && $length <= $offset - $start) {
// don't break out of the loop so we can read the remaining responses
$error = true;
}
$i--;
}
}