/**
* Performs pre-populate conversions on a migration script
*
* @static
* @param string $scriptName The uploaded / unpacked script file
* $param array $args The installation varibables
* @return converted filename on success, False on error
* @since 1.5
*/
function preMigrate($scriptName, &$args, $db)
{
$maxread = 0;
jimport('joomla.filesystem.file');
if (function_exists('memory_get_usage')) {
$memlimit = JInstallationHelper::return_bytes(ini_get('memory_limit'));
$maxread = $memlimit / 16;
// Read only a eigth of our max amount of memory, we could be up to a lot by now
// By default this pegs us at 0.5MB
}
$buffer = '';
$newPrefix = $args['DBPrefix'];
/*
* search and replace table prefixes
*/
$oldPrefix = trim($args['oldPrefix']);
$oldPrefix = rtrim($oldPrefix, '_') . '_';
$srcEncoding = $args['srcEncoding'];
if (!is_file($scriptName)) {
return false;
}
// not a file?
$newFile = dirname($scriptName) . DS . 'converted.sql';
$tfilesize = filesize($scriptName);
if ($maxread > 0 && $tfilesize > 0 && $maxread < $tfilesize) {
$parts = ceil($tfilesize / $maxread);
file_put_contents($newFile, '');
// cleanse the file first
for ($i = 0; $i < $parts; $i++) {
$buffer = JFile::read($scriptName, false, $maxread, $maxread, $i * $maxread);
// Lets try and read a portion of the file
JInstallationHelper::replaceBuffer($buffer, $oldPrefix, $newPrefix, $srcEncoding);
JInstallationHelper::appendFile($buffer, $newFile);
unset($buffer);
}
JFile::delete($scriptName);
} else {
/*
* read script file into buffer
*/
if (is_file($scriptName)) {
$buffer = file_get_contents($scriptName);
} else {
return false;
}
if ($buffer == false) {
return false;
}
JInstallationHelper::replaceBuffer($buffer, $oldPrefix, $newPrefix, $srcEncoding);
/*
* write to file
*/
//$newFile = dirname( $scriptName ).DS.'converted.sql';
$ret = file_put_contents($newFile, $buffer);
unset($buffer);
// Release the memory used by the buffer
jimport('joomla.filesystem.file');
JFile::delete($scriptName);
}
/*
* Create two empty temporary tables
*/
$query = 'DROP TABLE IF EXISTS ' . $newPrefix . 'modules_migration';
$db->setQuery($query);
$db->query();
$query = 'DROP TABLE IF EXISTS ' . $newPrefix . 'menu_migration';
$db->setQuery($query);
$db->query();
$query = 'CREATE TABLE ' . $newPrefix . 'modules_migration SELECT * FROM ' . $newPrefix . 'modules WHERE 0';
$db->setQuery($query);
$db->query();
$query = 'CREATE TABLE ' . $newPrefix . 'modules_migration_menu SELECT * FROM ' . $newPrefix . 'modules_menu WHERE 0';
$db->setQuery($query);
$db->Query();
$query = 'CREATE TABLE ' . $newPrefix . 'menu_migration SELECT * FROM ' . $newPrefix . 'menu WHERE 0';
$db->setQuery($query);
$db->query();
return $newFile;
}
