284 lines
9.2 KiB
PHP
284 lines
9.2 KiB
PHP
<?php
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/**
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* Copyright (c) Borago 2019
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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**/
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namespace Core\External\ZipStream {
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class File {
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private $name;
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private $content = '';
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private $fileHandle = false;
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private $lastModificationTimestamp;
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protected $fileSize = 0;
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protected $compressedSize = 0;
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private $offset = 0;
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private $bitField = 0;
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protected $useCompression = true;
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private $deflateState = null;
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//check for duplications //currently not used
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protected $crc32 = null;
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protected $sha256;
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public const BIT_NO_SIZE_IN_HEADER = 0b0000000000001000;
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public const BIT_UTF8_NAMES = 0b0000100000000000;
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public function __construct($name) {
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$this->name = $name;
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$this->lastModificationTimestamp = time();
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$this->crc32 = hash('crc32b', '', true);
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$this->compressedSize = 0;
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$this->fileSize = 0;
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$this->bitField = 0;
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$this->bitField |= self::BIT_NO_SIZE_IN_HEADER;
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$this->bitField |= self::BIT_UTF8_NAMES;
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$this->deflateState = deflate_init(ZLIB_ENCODING_RAW);
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}
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public function disableCompression() {
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$this->useCompression = false;
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}
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public function setContent($content) {
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$this->crc32 = hash('crc32b', $content, true);
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$this->sha256 = hash('sha256', $content);
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$this->content = $content;
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$this->fileSize = strlen($content);
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$this->fileHandle = false;
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}
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public function loadFromFile($filename) {
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$this->crc32 = hash_file('crc32b', $filename, true);
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$this->sha256 = hash_file('sha256', $filename);
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$this->fileSize = filesize($filename);
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$this->fileHandle = fopen($filename, 'rb');
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}
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public function name() {
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return $this->name;
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}
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public function sha256() {
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return $this->sha256;
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}
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private function unixTimeToDosTime($timestamp) {
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$hour = intval(date('H', $timestamp));
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$min = intval(date('i', $timestamp));
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$sec = intval(date('s', $timestamp));
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return ($hour << 11) |
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($min << 5) |
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($sec >> 1);
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}
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private function unixTimeToDosDate($timestamp) {
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$year = intval(date('Y', $timestamp));
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$month = intval(date('m', $timestamp));
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$day = intval(date('d', $timestamp));
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return (($year - 1980) << 9) |
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($month << 5) |
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($day);
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}
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public function readLocalFileHeader(bool $zip64 = false) {
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if (!$this->useCompression) {
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$this->compressedSize = $this->fileSize;
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}
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$header = "";
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$header .= "\x50\x4b\x03\x04";
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$header .= $zip64 ? "\x2d\x00" : "\x14\x00"; //version 2.0 and MS-DOS compatible
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$header .= pack("v", $this->bitField); //general purpose bit flag
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if ($this->useCompression) {
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$header .= "\x08\x00"; //compression Method - deflate
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} else {
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$header .= "\x00\x00"; //compression Method - no
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}
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$header .= pack("v", $this->unixTimeToDosTime($this->lastModificationTimestamp)); //dos time
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$header .= pack("v", $this->unixTimeToDosDate($this->lastModificationTimestamp)); //dos date
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if ($zip64) {
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if ($this->bitField & self::BIT_NO_SIZE_IN_HEADER) {
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$header .= pack("V", 0); //crc32
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} else {
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$header .= strrev($this->crc32);
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}
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$header .= "\xFF\xFF\xFF\xFF"; //compressed Size
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$header .= "\xFF\xFF\xFF\xFF"; //uncompressed Size
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} else {
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if ($this->bitField & self::BIT_NO_SIZE_IN_HEADER) {
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$header .= pack("V", 0); //crc32
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$header .= pack("V", 0); //compressed Size
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$header .= pack("V", 0); //uncompressed Size
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} else {
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$header .= strrev($this->crc32);
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$header .= pack("V", $this->compressedSize); //compressed Size
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$header .= pack("V", $this->fileSize); //uncompressed Size
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}
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}
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$header .= pack("v", strlen($this->name)); //filename
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if ($zip64) {
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$header .= pack("v", 16+4); //extra field length (signatures + data)
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$header .= $this->name;
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$header .= pack("v", 0x0001); # Zip64 extended information extra field
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$header .= pack("v", 16); // 2 * 8 byte
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if ($this->bitField & self::BIT_NO_SIZE_IN_HEADER) {
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$header .= pack("P", 0);
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$header .= pack("P", 0);
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} else {
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$header .= pack("P", $this->compressedSize);
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$header .= pack("P", $this->fileSize);
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}
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} else {
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$header .= "\x00\x00"; //extra field length
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$header .= $this->name;
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}
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return $header;
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}
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public function readDataDescriptor(bool $zip64 = false) {
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if (!$this->useCompression) {
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$this->compressedSize = $this->fileSize;
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}
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$data = "";
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$data .= "\x50\x4b\x07\x08";
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$data .= strrev($this->crc32);
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$data .= $zip64 ? pack("P", $this->compressedSize) : pack("V", $this->compressedSize); //compressed Size
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$data .= $zip64 ? pack("P", $this->fileSize) : pack("V", $this->fileSize); //uncompressed Size
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return $data;
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}
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public function readFileDataImp() {
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$ret = null;
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if ($this->fileHandle !== false) {
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$block = fread($this->fileHandle, 65536);
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if (!empty($block)) {
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$ret = $block;
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}
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} else {
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$ret = $this->content;
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$this->content = null;
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}
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return $ret;
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}
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protected function compress($block) {
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$ret = null;
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if ($this->deflateState !== null) {
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if (!empty($block)) {
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$ret = deflate_add($this->deflateState, $block, ZLIB_NO_FLUSH);
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} else {
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$ret = deflate_add($this->deflateState, '', ZLIB_FINISH);
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$this->deflateState = null;
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}
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$this->compressedSize += strlen($ret);
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}
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return $ret;
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}
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public function readFileData() {
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$ret = null;
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if ($this->useCompression) {
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$block = $this->readFileDataImp();
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$ret = $this->compress($block);
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} else {
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$ret = $this->readFileDataImp();
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}
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return $ret;
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}
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public function setOffset($offset) {
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$this->offset = $offset;
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}
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public function readCentralDirectoryHeader(bool $zip64 = false) {
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$maxInt32 = 0xFFFFFFFF;
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$extraFields = "";
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// Compressed Size
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if ($zip64 && $this->compressedSize >= $maxInt32) {
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$compressedSize = "\xFF\xFF\xFF\xFF";
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$extraFields .= pack("P", $this->compressedSize);
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} else {
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$compressedSize = pack("V", $this->compressedSize);
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}
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// Uncompressed Size
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if ($zip64 && $this->fileSize >= $maxInt32) {
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$fileSize = "\xFF\xFF\xFF\xFF";
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$extraFields .= pack("P", $this->fileSize);
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} else {
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$fileSize = pack("V", $this->fileSize);
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}
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// Offset
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if ($zip64 && $this->offset >= $maxInt32) {
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$offset = "\xFF\xFF\xFF\xFF";
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$extraFields .= pack("P", $this->offset);
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} else {
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$offset = pack("V", $this->offset);
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}
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$header = "";
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$header .= "\x50\x4b\x01\x02";
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$header .= $zip64 ? "\x2d\x00" : "\x14\x00"; //version 2.0 and MS-DOS compatible
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$header .= $zip64 ? "\x2d\x00" : "\x14\x00"; //version 2.0 and MS-DOS compatible
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$header .= pack("v", $this->bitField); //general purpose bit flag
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$header .= $this->useCompression ? "\x08\x00" : "\x00\x00"; //compression Method - no
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$header .= pack("v", $this->unixTimeToDosTime($this->lastModificationTimestamp)); //dos time
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$header .= pack("v", $this->unixTimeToDosDate($this->lastModificationTimestamp)); //dos date
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$header .= strrev($this->crc32);
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$header .= $compressedSize; //compressed Size
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$header .= $fileSize; //uncompressed Size
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$header .= pack("v", strlen($this->name)); //filename
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$header .= (strlen($extraFields) > 0) ? pack('v', strlen($extraFields) + 4) : "\x00\x00"; //extra field length
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$header .= "\x00\x00"; //comment length
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$header .= "\x00\x00"; //disk num start
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$header .= "\x00\x00"; //int file attr
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$header .= "\x00\x00\x00\x00"; //ext file attr
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$header .= $offset; //relative offset
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$header .= $this->name;
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if (strlen($extraFields) > 0) {
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$header .= pack("v", 0x0001); # Zip64 extended information extra field
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$header .= pack("v", strlen($extraFields));
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$header .= $extraFields;
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}
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return $header;
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}
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public function closeHandle() {
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if ($this->fileHandle) {
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fclose($this->fileHandle);
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}
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}
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}
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} |