CWebdavDocumentHistory::GetFileForHistory

static function GetFileForHistory($documentId, $propertyValue, $historyIndex)
{
	$newFileID = $propertyValue['VALUE'];
	$bNewFile = true;

	$history = self::GetHistoryService();

	$dbDoc = $history->GetHistoryList(
		array("ID" => "DESC"),
		array("DOCUMENT_ID" => $documentId),
		false,
		false,
		array("ID", "DOCUMENT_ID", "NAME", "MODIFIED", "USER_ID", "USER_NAME", "USER_LAST_NAME", "USER_LOGIN", "DOCUMENT")
	);

	$newFileHash = CWebDavBase::_get_file_hash($newFileID);
	$oldFileHash = null;

	if ($newFileHash !== null)
	{
		if ($dbDoc && ($arTmpDoc = $dbDoc->Fetch())) // skip current saving copy
		{
			while ($arDoc = $dbDoc->Fetch())
			{
				$oldFileHash = $arDoc['DOCUMENT']['PROPERTIES']['FILE']['HASH'];
				if ($oldFileHash == $newFileHash)
				{
					$bNewFile = false;
					$result = $arDoc['DOCUMENT']['PROPERTIES']['FILE'];
					break;
				}
			}
		}
	}

	if ($oldFileHash == null || $newFileHash == null)
		$bNewFile = true;	// add new copy to history

	if ($bNewFile)
	{
		$result = array(
			"VALUE" => CBPDocument::PrepareFileForHistory(
				$documentId,
				$propertyValue["VALUE"],
				$historyIndex
			),
			"DESCRIPTION" => $propertyValue["DESCRIPTION"],
			"HASH" => $newFileHash
		);
	}

	return $result;
}