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213 lines
6.3 KiB
213 lines
6.3 KiB
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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* @copyright Copyright (c) 2016, Lukas Reschke <lukas@statuscode.ch>
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*
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* @author Andreas Fischer <bantu@owncloud.com>
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author marco44 <cousinmarc@gmail.com>
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* @author Michael Roitzsch <reactorcontrol@icloud.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC;
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use bantu\IniGetWrapper\IniGetWrapper;
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/**
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* Helper class for large files on 32-bit platforms.
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*/
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class LargeFileHelper {
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/**
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* pow(2, 53) as a base-10 string.
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* @var string
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*/
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public const POW_2_53 = '9007199254740992';
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/**
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* pow(2, 53) - 1 as a base-10 string.
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* @var string
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*/
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public const POW_2_53_MINUS_1 = '9007199254740991';
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/**
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* @brief Checks whether our assumptions hold on the PHP platform we are on.
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*
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* @throws \RunTimeException if our assumptions do not hold on the current
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* PHP platform.
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*/
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public function __construct() {
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$pow_2_53 = (float)self::POW_2_53_MINUS_1 + 1.0;
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if ($this->formatUnsignedInteger($pow_2_53) !== self::POW_2_53) {
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throw new \RuntimeException(
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'This class assumes floats to be double precision or "better".'
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);
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}
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}
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/**
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* @brief Formats a signed integer or float as an unsigned integer base-10
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* string. Passed strings will be checked for being base-10.
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*
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* @param int|float|string $number Number containing unsigned integer data
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*
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* @throws \UnexpectedValueException if $number is not a float, not an int
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* and not a base-10 string.
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*
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* @return string Unsigned integer base-10 string
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*/
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public function formatUnsignedInteger($number) {
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if (is_float($number)) {
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// Undo the effect of the php.ini setting 'precision'.
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return number_format($number, 0, '', '');
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} elseif (is_string($number) && ctype_digit($number)) {
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return $number;
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} elseif (is_int($number)) {
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// Interpret signed integer as unsigned integer.
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return sprintf('%u', $number);
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} else {
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throw new \UnexpectedValueException(
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'Expected int, float or base-10 string'
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);
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}
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}
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/**
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* @brief Tries to get the size of a file via various workarounds that
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* even work for large files on 32-bit platforms.
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*
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* @param string $filename Path to the file.
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*
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* @return null|int|float Number of bytes as number (float or int) or
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* null on failure.
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*/
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public function getFileSize($filename) {
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$fileSize = $this->getFileSizeViaCurl($filename);
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if (!is_null($fileSize)) {
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return $fileSize;
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}
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$fileSize = $this->getFileSizeViaExec($filename);
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if (!is_null($fileSize)) {
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return $fileSize;
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}
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return $this->getFileSizeNative($filename);
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}
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/**
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* @brief Tries to get the size of a file via a CURL HEAD request.
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*
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* @param string $fileName Path to the file.
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*
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* @return null|int|float Number of bytes as number (float or int) or
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* null on failure.
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*/
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public function getFileSizeViaCurl($fileName) {
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if (\OC::$server->get(IniGetWrapper::class)->getString('open_basedir') === '') {
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$encodedFileName = rawurlencode($fileName);
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$ch = curl_init("file:///$encodedFileName");
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curl_setopt($ch, CURLOPT_NOBODY, true);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($ch, CURLOPT_HEADER, true);
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$data = curl_exec($ch);
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curl_close($ch);
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if ($data !== false) {
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$matches = [];
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preg_match('/Content-Length: (\d+)/', $data, $matches);
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if (isset($matches[1])) {
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return 0 + $matches[1];
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}
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}
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}
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return null;
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}
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/**
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* @brief Tries to get the size of a file via an exec() call.
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*
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* @param string $filename Path to the file.
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*
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* @return null|int|float Number of bytes as number (float or int) or
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* null on failure.
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*/
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public function getFileSizeViaExec($filename) {
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if (\OC_Helper::is_function_enabled('exec')) {
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$os = strtolower(php_uname('s'));
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$arg = escapeshellarg($filename);
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$result = null;
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if (strpos($os, 'linux') !== false) {
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$result = $this->exec("stat -c %s $arg");
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} elseif (strpos($os, 'bsd') !== false || strpos($os, 'darwin') !== false) {
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$result = $this->exec("stat -f %z $arg");
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}
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return $result;
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}
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return null;
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}
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/**
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* @brief Gets the size of a file via a filesize() call and converts
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* negative signed int to positive float. As the result of filesize()
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* will wrap around after a file size of 2^32 bytes = 4 GiB, this
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* should only be used as a last resort.
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*
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* @param string $filename Path to the file.
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*
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* @return int|float Number of bytes as number (float or int).
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*/
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public function getFileSizeNative($filename) {
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$result = filesize($filename);
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if ($result < 0) {
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// For file sizes between 2 GiB and 4 GiB, filesize() will return a
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// negative int, as the PHP data type int is signed. Interpret the
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// returned int as an unsigned integer and put it into a float.
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return (float) sprintf('%u', $result);
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}
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return $result;
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}
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/**
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* Returns the current mtime for $fullPath
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*
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* @param string $fullPath
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* @return int
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*/
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public function getFileMtime($fullPath) {
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try {
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$result = filemtime($fullPath);
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} catch (\Exception $e) {
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$result =- 1;
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}
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if ($result < 0) {
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if (\OC_Helper::is_function_enabled('exec')) {
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$os = strtolower(php_uname('s'));
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if (strpos($os, 'linux') !== false) {
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return $this->exec('stat -c %Y ' . escapeshellarg($fullPath));
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}
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}
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}
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return $result;
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}
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protected function exec($cmd) {
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$result = trim(exec($cmd));
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return ctype_digit($result) ? 0 + $result : null;
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}
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}
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