function getPreviousFileContent()
{
$path = $this->checkPreviousChecksumFile();
if ($path != false) {
return file($path);
} else {
$url = $this->_url . $this->_previousName;
$objJSNHTTP = new JSNISHTTPRequest($url);
$content = $objJSNHTTP->DownloadToString();
if ($content == false) {
$content = array();
return $content;
}
return explode("\n", $content);
}
}
function DownloadToString()
{
$crlf = "\r\n";
// generate request
$req = 'GET ' . $this->_uri . ' HTTP/1.0' . $crlf . 'Host: ' . $this->_host . $crlf . $crlf;
// fetch
$this->_fp = fsockopen(($this->_protocol == 'https' ? 'ssl://' : '') . $this->_host, $this->_port);
fwrite($this->_fp, $req);
while (is_resource($this->_fp) && $this->_fp && !feof($this->_fp)) {
@($response .= fread($this->_fp, 1024));
}
fclose($this->_fp);
// split header and body
$pos = strpos($response, $crlf . $crlf);
if ($pos === false) {
return $response;
}
$header = substr($response, 0, $pos);
$body = substr($response, $pos + 2 * strlen($crlf));
// parse headers
$headers = array();
$lines = explode($crlf, $header);
foreach ($lines as $line) {
if (($pos = strpos($line, ':')) !== false) {
$headers[strtolower(trim(substr($line, 0, $pos)))] = trim(substr($line, $pos + 1));
}
}
// redirection?
if (isset($headers['location'])) {
$http = new JSNISHTTPRequest($headers['location']);
return $http->DownloadToString($http);
} else {
return $body;
}
}