Current File : /var/www/tif-dev/wp-content/plugins/worker/src/MWP/IncrementalBackup/HashComputer.php
<?php
/*
* This file is part of the ManageWP Worker plugin.
*
* (c) ManageWP LLC <contact@managewp.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
class MWP_IncrementalBackup_HashComputer
{
// 100kb default value
private $maxChunkByteSize = 102400;
/**
* @param int $maxChunkByteSize
*/
public function setMaxChunkByteSize($maxChunkByteSize)
{
$this->maxChunkByteSize = $maxChunkByteSize;
}
/**
* @return int
*/
public function getMaxChunkByteSize()
{
return $this->maxChunkByteSize;
}
/**
* Compute a full md5 file hash or compute a partial hash if $limit is present.
* Returns null on failure.
*
* @param string $realPath
* @param int $offset in bytes
* @param int $limit in bytes
* @param boolean $forcePartialHashing
*
* @return null|string
*/
public function computeMd5Hash($realPath, $offset = 0, $limit = 0, $forcePartialHashing = false)
{
if ($limit === 0 && $offset === 0 && !$forcePartialHashing) {
// md5_file is always faster if we don't chunk the file
$hash = md5_file($realPath);
return $hash !== false ? $hash : null;
}
$ctx = hash_init('md5');
if (!$ctx) {
// Fail to initialize file hashing
return null;
}
// Calculate limit from file size and offset
if ($limit === 0) {
$limit = filesize($realPath) - $offset;
}
$fh = @fopen($realPath, "rb");
if ($fh === false) {
// Failed opening file, cleanup hash context
hash_final($ctx);
return null;
}
fseek($fh, $offset);
while ($limit > 0) {
// Limit chunk size to either our remaining chunk or max chunk size
$chunkSize = $limit < $this->maxChunkByteSize ? $limit : $this->maxChunkByteSize;
$limit -= $chunkSize;
$chunk = fread($fh, $chunkSize);
hash_update($ctx, $chunk);
}
fclose($fh);
return hash_final($ctx);
}
/**
* Run md5sum process and return file hash, or null in case of error
*
* @param $realPath
*
* @return string|null
*/
public function computeUnixMd5Sum($realPath)
{
try {
$processBuilder = Symfony_Process_ProcessBuilder::create()
->setPrefix('md5sum')
->add($realPath);
if (!mwp_is_shell_available()) {
throw new MWP_Worker_Exception(MWP_Worker_Exception::SHELL_NOT_AVAILABLE, "Shell is not available");
}
$process = $processBuilder->getProcess();
$process->run();
if (!$process->isSuccessful()) {
throw new Symfony_Process_Exception_ProcessFailedException($process);
}
// Output is in the format of "md5hash filename"
$output = trim($process->getOutput());
$parts = explode(' ', $output);
// Return only the first part of the output
return trim($parts[0]);
} catch (Symfony_Process_Exception_ProcessFailedException $e) {
mwp_logger()->error('MD5 command line sum failed', array(
'process' => $e->getProcess(),
));
} catch (Exception $e) {
mwp_logger()->error('MD5 command line sum failed', array(
'exception' => $e,
));
}
return null;
}
}
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