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<?php
/**
* MBOXCreator is a FeedCreator that implements the mbox format
* as described in http://www.qmail.org/man/man5/mbox.html
*
* @since 1.3
* @author Kai Blankenhorn <kaib@bitfolge.de>
*/
class MBOXCreator extends FeedCreator
{
/**
* MBOXCreator constructor.
*/
public function __construct()
{
$this->contentType = "text/plain";
$this->encoding = "ISO-8859-15";
}
/**
* Quoted Printable encoding
*
* @param string $input
* @param int $line_max wrap lines after these number of characters
* @return string
*/
protected function qp_enc($input = "", $line_max = 76)
{
$hex = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
$lines = preg_split("/(?:\r\n|\r|\n)/", $input);
$eol = "\r\n";
$escape = "=";
$output = "";
foreach ($lines as $line) {
$linlen = strlen($line);
$newline = "";
for ($i = 0; $i < $linlen; $i++) {
$c = substr($line, $i, 1);
$dec = ord($c);
if (($dec == 32) && ($i == ($linlen - 1))) { // convert space at eol only
$c = "=20";
} elseif (($dec == 61) || ($dec < 32) || ($dec > 126)) { // always encode "\t", which is *not* required
$h2 = floor($dec / 16);
$h1 = floor($dec % 16);
$c = $escape.$hex["$h2"].$hex["$h1"];
}
if ((strlen($newline) + strlen($c)) >= $line_max) { // CRLF is not counted
$output .= $newline.$escape.$eol; // soft line break; " =\r\n" is okay
$newline = "";
}
$newline .= $c;
} // end of for
$output .= $newline.$eol;
}
return trim($output);
}
/**
* Builds the MBOX contents.
*
* @inheritdoc
*/
public function createFeed()
{
$feed = '';
for ($i = 0; $i < count($this->items); $i++) {
if ($this->items[$i]->author != "") {
$from = $this->items[$i]->author;
} else {
$from = $this->title;
}
$itemDate = new FeedDate($this->items[$i]->date);
$feed .= "From ".strtr(MBOXCreator::qp_enc($from), " ", "_")." ".date(
"D M d H:i:s Y",
$itemDate->unix()
)."\n";
$feed .= "Content-Type: text/plain;\n";
$feed .= " charset=\"".$this->encoding."\"\n";
$feed .= "Content-Transfer-Encoding: quoted-printable\n";
$feed .= "Content-Type: text/plain\n";
$feed .= "From: \"".MBOXCreator::qp_enc($from)."\"\n";
$feed .= "Date: ".$itemDate->rfc822()."\n";
$feed .= "Subject: ".MBOXCreator::qp_enc(FeedCreator::iTrunc($this->items[$i]->title, 100))."\n";
$feed .= "\n";
$body = chunk_split(MBOXCreator::qp_enc($this->items[$i]->description));
$feed .= preg_replace("~\nFrom ([^\n]*)(\n?)~", "\n>From $1$2\n", $body);
$feed .= "\n";
$feed .= "\n";
}
return $feed;
}
/**
* Generate a filename for the feed cache file. Overridden from FeedCreator to prevent XML data types.
*
* @return string the feed cache filename
* @since 1.4
* @access private
*/
protected function _generateFilename()
{
$fileInfo = pathinfo($_SERVER["PHP_SELF"]);
return substr($fileInfo["basename"], 0, -(strlen($fileInfo["extension"]) + 1)).".mbox";
}
}
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