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<?php
/**
* Copyright (c) 2012 Bart Visscher <bartv@thisnet.nl>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
class OC_FileChunking {
protected $info;
protected $cache;
static public function decodeName($name) {
preg_match('/(?P<name>.*)-chunking-(?P<transferid>\d+)-(?P<chunkcount>\d+)-(?P<index>\d+)/', $name, $matches);
return $matches;
}
/**
* @param string[] $info
*/
public function __construct($info) {
$this->info = $info;
}
public function getPrefix() {
$name = $this->info['name'];
$transferid = $this->info['transferid'];
return $name.'-chunking-'.$transferid.'-';
}
protected function getCache() {
if (!isset($this->cache)) {
$this->cache = new \OC\Cache\File();
}
return $this->cache;
}
/**
* Stores the given $data under the given $key - the number of stored bytes is returned
*
* @param string $index
* @param resource $data
* @return int
*/
public function store($index, $data) {
$cache = $this->getCache();
$name = $this->getPrefix().$index;
$cache->set($name, $data);
return $cache->size($name);
}
public function isComplete() {
$prefix = $this->getPrefix();
$parts = 0;
$cache = $this->getCache();
for($i=0; $i < $this->info['chunkcount']; $i++) {
if ($cache->hasKey($prefix.$i)) {
$parts ++;
}
}
return $parts == $this->info['chunkcount'];
}
/**
* Assembles the chunks into the file specified by the path.
* Chunks are deleted afterwards.
*
* @param string $f target path
*
* @return integer assembled file size
*
* @throws \OC\InsufficientStorageException when file could not be fully
* assembled due to lack of free space
*/
public function assemble($f) {
$cache = $this->getCache();
$prefix = $this->getPrefix();
$count = 0;
for ($i = 0; $i < $this->info['chunkcount']; $i++) {
$chunk = $cache->get($prefix.$i);
// remove after reading to directly save space
$cache->remove($prefix.$i);
$count += fwrite($f, $chunk);
}
return $count;
}
/**
* Returns the size of the chunks already present
* @return integer size in bytes
*/
public function getCurrentSize() {
$cache = $this->getCache();
$prefix = $this->getPrefix();
$total = 0;
for ($i = 0; $i < $this->info['chunkcount']; $i++) {
$total += $cache->size($prefix.$i);
}
return $total;
}
/**
* Removes all chunks which belong to this transmission
*/
public function cleanup() {
$cache = $this->getCache();
$prefix = $this->getPrefix();
for($i=0; $i < $this->info['chunkcount']; $i++) {
$cache->remove($prefix.$i);
}
}
/**
* Removes one specific chunk
* @param string $index
*/
public function remove($index) {
$cache = $this->getCache();
$prefix = $this->getPrefix();
$cache->remove($prefix.$index);
}
public function signature_split($orgfile, $input) {
$info = unpack('n', fread($input, 2));
$blocksize = $info[1];
$this->info['transferid'] = mt_rand();
$count = 0;
$needed = array();
$cache = $this->getCache();
$prefix = $this->getPrefix();
while (!feof($orgfile)) {
$new_md5 = fread($input, 16);
if (feof($input)) {
break;
}
$data = fread($orgfile, $blocksize);
$org_md5 = md5($data, true);
if ($org_md5 == $new_md5) {
$cache->set($prefix.$count, $data);
} else {
$needed[] = $count;
}
$count++;
}
return array(
'transferid' => $this->info['transferid'],
'needed' => $needed,
'count' => $count,
);
}
/**
* Assembles the chunks into the file specified by the path.
* Also triggers the relevant hooks and proxies.
*
* @param string $path target path
*
* @return boolean assembled file size or false if file could not be created
*
* @throws \OC\InsufficientStorageException when file could not be fully
* assembled due to lack of free space
*/
public function file_assemble($path) {
$absolutePath = \OC\Files\Filesystem::normalizePath(\OC\Files\Filesystem::getView()->getAbsolutePath($path));
$data = '';
// use file_put_contents as method because that best matches what this function does
if (OC_FileProxy::runPreProxies('file_put_contents', $absolutePath, $data)
&& \OC\Files\Filesystem::isValidPath($path)) {
$path = \OC\Files\Filesystem::getView()->getRelativePath($absolutePath);
$exists = \OC\Files\Filesystem::file_exists($path);
$run = true;
if(!$exists) {
OC_Hook::emit(
\OC\Files\Filesystem::CLASSNAME,
\OC\Files\Filesystem::signal_create,
array(
\OC\Files\Filesystem::signal_param_path => $path,
\OC\Files\Filesystem::signal_param_run => &$run
)
);
}
OC_Hook::emit(
\OC\Files\Filesystem::CLASSNAME,
\OC\Files\Filesystem::signal_write,
array(
\OC\Files\Filesystem::signal_param_path => $path,
\OC\Files\Filesystem::signal_param_run => &$run
)
);
if(!$run) {
return false;
}
$target = \OC\Files\Filesystem::fopen($path, 'w');
if($target) {
$count = $this->assemble($target);
fclose($target);
if(!$exists) {
OC_Hook::emit(
\OC\Files\Filesystem::CLASSNAME,
\OC\Files\Filesystem::signal_post_create,
array( \OC\Files\Filesystem::signal_param_path => $path)
);
}
OC_Hook::emit(
\OC\Files\Filesystem::CLASSNAME,
\OC\Files\Filesystem::signal_post_write,
array( \OC\Files\Filesystem::signal_param_path => $path)
);
OC_FileProxy::runPostProxies('file_put_contents', $absolutePath, $count);
return $count > 0;
}else{
return false;
}
}
return false;
}
}
|
