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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 $matches;
}
public function __construct($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 $this->cache;
}
public function store($index, $data) {
$cache = $this->getCache();
$name = $this->getPrefix().$index;
$cache->set($name, $data);
}
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 == $this->info['chunkcount'];
}
public function assemble($f) {
$cache = $this->getCache();
$prefix = $this->getPrefix();
for($i=0; $i < $this->info['chunkcount']; $i++) {
$chunk = $cache->get($prefix.$i);
$cache->remove($prefix.$i);
fwrite($f,$chunk);
}
fclose($f);
}
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,
);
}
}
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