CMailTools::__replace_img

function __replace_img($matches)
{
	$io = CBXVirtualIo::GetInstance();
	$src = $matches[3];

	if($src == "")
		return $matches[0];

	if(array_key_exists($src, $this->aMatches))
	{
		$uid = $this->aMatches[$src]["ID"];
		return $matches[1].$matches[2]."cid:".$uid.$matches[4].$matches[5];
	}

	$filePath = $io->GetPhysicalName($_SERVER["DOCUMENT_ROOT"].$src);
	if(!file_exists($filePath))
		return $matches[0];

	if (
		$this->maxFileSize > 0
		&& filesize($filePath) > $this->maxFileSize
	)
		return $matches[0];

	$aImage = CFile::GetImageSize($filePath, true);
	if (!is_array($aImage))
		return $matches[0];

	if (function_exists("image_type_to_mime_type"))
		$contentType = image_type_to_mime_type($aImage[2]);
	else
		$contentType = CMailTools::ImageTypeToMimeType($aImage[2]);

	$uid = uniqid(md5($src));

	$this->aMatches[$src] = array(
		"SRC" => $src,
		"PATH" => $filePath,
		"CONTENT_TYPE" => $contentType,
		"DEST" => bx_basename($src),
		"ID" => $uid,
	);

	return $matches[1].$matches[2]."cid:".$uid.$matches[4].$matches[5];
}