web-base/core/External/ZipStream/ZipStream.php

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2021-01-13 01:36:04 +01:00
<?php
/**
* Copyright (c) Borago 2019
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
**/
namespace External\ZipStream {
class ZipStream {
private $writer = null;
private $files = [];
public function __construct($writer) {
$this->writer = $writer;
}
public function saveFile($file) {
$isSymlink = false; //currently not used
foreach ($this->files as $f) {
if ($f->name() == $file->name()) {
return false;
}
if ($f->sha256() == $file->sha256()) {
$isSymlink = true;
}
}
$file->setOffset($this->writer->offset());
$this->writer->write($file->readLocalFileHeader());
while (($buffer = $file->readFileData()) !== null) {
$this->writer->write($buffer);
}
$this->writer->write($file->readDataDescriptor());
$this->files[] = $file;
$file->closeHandle();
return true;
}
public function close() {
$size = 0;
$offset = $this->writer->offset();
foreach ($this->files as $file) {
$size += $this->writer->write($file->readCentralDirectoryHeader());
}
$data = "";
$data .= "\x50\x4b\x05\x06";
$data .= "\x00\x00"; //number of disks
$data .= "\x00\x00"; //number of the disk with the start of the central directory
$data .= pack("v", count($this->files)); //total number of entries in the central directory on this disk
$data .= pack("v", count($this->files)); //total number of entries in the central directory
$data .= pack("V", $size); //size of the central directory
$data .= pack("V", $offset); //offset of start of central directory with respect to the starting disk number
$data .= "\x0\x0"; //comment length
$this->writer->write($data);
}
}
}