609 lines
19 KiB
PHP
609 lines
19 KiB
PHP
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<?php
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declare(strict_types=1);
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namespace ZipStream;
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use Psr\Http\Message\StreamInterface;
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use ZipStream\Exception\OverflowException;
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use ZipStream\Option\Archive as ArchiveOptions;
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use ZipStream\Option\File as FileOptions;
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use ZipStream\Option\Version;
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/**
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* ZipStream
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*
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* Streamed, dynamically generated zip archives.
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*
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* Usage:
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*
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* Streaming zip archives is a simple, three-step process:
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*
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* 1. Create the zip stream:
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*
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* $zip = new ZipStream('example.zip');
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*
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* 2. Add one or more files to the archive:
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*
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* * add first file
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* $data = file_get_contents('some_file.gif');
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* $zip->addFile('some_file.gif', $data);
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*
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* * add second file
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* $data = file_get_contents('some_file.gif');
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* $zip->addFile('another_file.png', $data);
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*
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* 3. Finish the zip stream:
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*
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* $zip->finish();
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*
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* You can also add an archive comment, add comments to individual files,
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* and adjust the timestamp of files. See the API documentation for each
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* method below for additional information.
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*
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* Example:
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*
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* // create a new zip stream object
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* $zip = new ZipStream('some_files.zip');
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*
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* // list of local files
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* $files = array('foo.txt', 'bar.jpg');
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*
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* // read and add each file to the archive
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* foreach ($files as $path)
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* $zip->addFile($path, file_get_contents($path));
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*
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* // write archive footer to stream
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* $zip->finish();
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*/
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class ZipStream
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{
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/**
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* This number corresponds to the ZIP version/OS used (2 bytes)
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* From: https://www.iana.org/assignments/media-types/application/zip
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* The upper byte (leftmost one) indicates the host system (OS) for the
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* file. Software can use this information to determine
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* the line record format for text files etc. The current
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* mappings are:
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*
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* 0 - MS-DOS and OS/2 (F.A.T. file systems)
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* 1 - Amiga 2 - VAX/VMS
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* 3 - *nix 4 - VM/CMS
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* 5 - Atari ST 6 - OS/2 H.P.F.S.
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* 7 - Macintosh 8 - Z-System
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* 9 - CP/M 10 thru 255 - unused
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*
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* The lower byte (rightmost one) indicates the version number of the
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* software used to encode the file. The value/10
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* indicates the major version number, and the value
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* mod 10 is the minor version number.
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* Here we are using 6 for the OS, indicating OS/2 H.P.F.S.
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* to prevent file permissions issues upon extract (see #84)
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* 0x603 is 00000110 00000011 in binary, so 6 and 3
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*/
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public const ZIP_VERSION_MADE_BY = 0x603;
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/**
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* The following signatures end with 0x4b50, which in ASCII is PK,
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* the initials of the inventor Phil Katz.
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* See https://en.wikipedia.org/wiki/Zip_(file_format)#File_headers
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*/
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public const FILE_HEADER_SIGNATURE = 0x04034b50;
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public const CDR_FILE_SIGNATURE = 0x02014b50;
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public const CDR_EOF_SIGNATURE = 0x06054b50;
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public const DATA_DESCRIPTOR_SIGNATURE = 0x08074b50;
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public const ZIP64_CDR_EOF_SIGNATURE = 0x06064b50;
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public const ZIP64_CDR_LOCATOR_SIGNATURE = 0x07064b50;
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/**
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* Global Options
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*
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* @var ArchiveOptions
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*/
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public $opt;
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/**
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* @var array
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*/
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public $files = [];
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/**
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* @var Bigint
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*/
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public $cdr_ofs;
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/**
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* @var Bigint
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*/
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public $ofs;
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/**
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* @var bool
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*/
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protected $need_headers;
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/**
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* @var null|String
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*/
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protected $output_name;
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/**
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* Create a new ZipStream object.
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*
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* Parameters:
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*
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* @param String $name - Name of output file (optional).
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* @param ArchiveOptions $opt - Archive Options
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*
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* Large File Support:
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*
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* By default, the method addFileFromPath() will send send files
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* larger than 20 megabytes along raw rather than attempting to
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* compress them. You can change both the maximum size and the
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* compression behavior using the largeFile* options above, with the
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* following caveats:
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*
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* * For "small" files (e.g. files smaller than largeFileSize), the
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* memory use can be up to twice that of the actual file. In other
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* words, adding a 10 megabyte file to the archive could potentially
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* occupy 20 megabytes of memory.
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*
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* * Enabling compression on large files (e.g. files larger than
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* large_file_size) is extremely slow, because ZipStream has to pass
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* over the large file once to calculate header information, and then
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* again to compress and send the actual data.
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*
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* Examples:
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*
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* // create a new zip file named 'foo.zip'
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* $zip = new ZipStream('foo.zip');
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*
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* // create a new zip file named 'bar.zip' with a comment
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* $opt->setComment = 'this is a comment for the zip file.';
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* $zip = new ZipStream('bar.zip', $opt);
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*
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* Notes:
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*
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* In order to let this library send HTTP headers, a filename must be given
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* _and_ the option `sendHttpHeaders` must be `true`. This behavior is to
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* allow software to send its own headers (including the filename), and
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* still use this library.
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*/
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public function __construct(?string $name = null, ?ArchiveOptions $opt = null)
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{
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$this->opt = $opt ?: new ArchiveOptions();
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$this->output_name = $name;
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$this->need_headers = $name && $this->opt->isSendHttpHeaders();
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$this->cdr_ofs = new Bigint();
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$this->ofs = new Bigint();
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}
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/**
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* addFile
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*
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* Add a file to the archive.
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*
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* @param String $name - path of file in archive (including directory).
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* @param String $data - contents of file
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* @param FileOptions $options
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*
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* File Options:
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* time - Last-modified timestamp (seconds since the epoch) of
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* this file. Defaults to the current time.
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* comment - Comment related to this file.
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* method - Storage method for file ("store" or "deflate")
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*
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* Examples:
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*
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* // add a file named 'foo.txt'
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* $data = file_get_contents('foo.txt');
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* $zip->addFile('foo.txt', $data);
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*
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* // add a file named 'bar.jpg' with a comment and a last-modified
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* // time of two hours ago
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* $data = file_get_contents('bar.jpg');
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* $opt->setTime = time() - 2 * 3600;
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* $opt->setComment = 'this is a comment about bar.jpg';
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* $zip->addFile('bar.jpg', $data, $opt);
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*/
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public function addFile(string $name, string $data, ?FileOptions $options = null): void
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{
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$options = $options ?: new FileOptions();
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$options->defaultTo($this->opt);
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$file = new File($this, $name, $options);
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$file->processData($data);
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}
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/**
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* addFileFromPath
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*
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* Add a file at path to the archive.
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*
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* Note that large files may be compressed differently than smaller
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* files; see the "Large File Support" section above for more
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* information.
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*
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* @param String $name - name of file in archive (including directory path).
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* @param String $path - path to file on disk (note: paths should be encoded using
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* UNIX-style forward slashes -- e.g '/path/to/some/file').
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* @param FileOptions $options
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*
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* File Options:
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* time - Last-modified timestamp (seconds since the epoch) of
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* this file. Defaults to the current time.
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* comment - Comment related to this file.
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* method - Storage method for file ("store" or "deflate")
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*
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* Examples:
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*
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* // add a file named 'foo.txt' from the local file '/tmp/foo.txt'
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* $zip->addFileFromPath('foo.txt', '/tmp/foo.txt');
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*
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* // add a file named 'bigfile.rar' from the local file
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* // '/usr/share/bigfile.rar' with a comment and a last-modified
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* // time of two hours ago
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* $path = '/usr/share/bigfile.rar';
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* $opt->setTime = time() - 2 * 3600;
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* $opt->setComment = 'this is a comment about bar.jpg';
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* $zip->addFileFromPath('bigfile.rar', $path, $opt);
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*
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* @return void
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* @throws \ZipStream\Exception\FileNotFoundException
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* @throws \ZipStream\Exception\FileNotReadableException
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*/
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public function addFileFromPath(string $name, string $path, ?FileOptions $options = null): void
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{
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$options = $options ?: new FileOptions();
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$options->defaultTo($this->opt);
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$file = new File($this, $name, $options);
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$file->processPath($path);
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}
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/**
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* addFileFromStream
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*
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* Add an open stream to the archive.
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*
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* @param String $name - path of file in archive (including directory).
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* @param resource $stream - contents of file as a stream resource
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* @param FileOptions $options
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*
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* File Options:
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* time - Last-modified timestamp (seconds since the epoch) of
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* this file. Defaults to the current time.
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* comment - Comment related to this file.
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*
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* Examples:
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*
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* // create a temporary file stream and write text to it
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* $fp = tmpfile();
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* fwrite($fp, 'The quick brown fox jumped over the lazy dog.');
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*
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* // add a file named 'streamfile.txt' from the content of the stream
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* $x->addFileFromStream('streamfile.txt', $fp);
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*
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* @return void
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*/
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public function addFileFromStream(string $name, $stream, ?FileOptions $options = null): void
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{
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$options = $options ?: new FileOptions();
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$options->defaultTo($this->opt);
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$file = new File($this, $name, $options);
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$file->processStream(new Stream($stream));
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}
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/**
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* addFileFromPsr7Stream
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*
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* Add an open stream to the archive.
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*
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* @param String $name - path of file in archive (including directory).
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* @param StreamInterface $stream - contents of file as a stream resource
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* @param FileOptions $options
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*
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* File Options:
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* time - Last-modified timestamp (seconds since the epoch) of
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* this file. Defaults to the current time.
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* comment - Comment related to this file.
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*
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* Examples:
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*
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* $stream = $response->getBody();
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* // add a file named 'streamfile.txt' from the content of the stream
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* $x->addFileFromPsr7Stream('streamfile.txt', $stream);
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*
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* @return void
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*/
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public function addFileFromPsr7Stream(
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string $name,
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StreamInterface $stream,
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?FileOptions $options = null
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): void {
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$options = $options ?: new FileOptions();
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$options->defaultTo($this->opt);
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$file = new File($this, $name, $options);
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$file->processStream($stream);
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}
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/**
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* finish
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*
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* Write zip footer to stream.
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*
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* Example:
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*
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* // add a list of files to the archive
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* $files = array('foo.txt', 'bar.jpg');
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* foreach ($files as $path)
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* $zip->addFile($path, file_get_contents($path));
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*
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* // write footer to stream
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* $zip->finish();
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* @return void
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*
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* @throws OverflowException
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*/
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public function finish(): void
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{
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// add trailing cdr file records
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foreach ($this->files as $cdrFile) {
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$this->send($cdrFile);
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$this->cdr_ofs = $this->cdr_ofs->add(Bigint::init(strlen($cdrFile)));
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}
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// Add 64bit headers (if applicable)
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if (count($this->files) >= 0xFFFF ||
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$this->cdr_ofs->isOver32() ||
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$this->ofs->isOver32()) {
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if (!$this->opt->isEnableZip64()) {
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throw new OverflowException();
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}
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$this->addCdr64Eof();
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$this->addCdr64Locator();
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}
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// add trailing cdr eof record
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$this->addCdrEof();
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// The End
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$this->clear();
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}
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/**
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* Create a format string and argument list for pack(), then call
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|
|
* pack() and return the result.
|
||
|
|
*
|
||
|
|
* @param array $fields
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
public static function packFields(array $fields): string
|
||
|
|
{
|
||
|
|
$fmt = '';
|
||
|
|
$args = [];
|
||
|
|
|
||
|
|
// populate format string and argument list
|
||
|
|
foreach ($fields as [$format, $value]) {
|
||
|
|
if ($format === 'P') {
|
||
|
|
$fmt .= 'VV';
|
||
|
|
if ($value instanceof Bigint) {
|
||
|
|
$args[] = $value->getLow32();
|
||
|
|
$args[] = $value->getHigh32();
|
||
|
|
} else {
|
||
|
|
$args[] = $value;
|
||
|
|
$args[] = 0;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if ($value instanceof Bigint) {
|
||
|
|
$value = $value->getLow32();
|
||
|
|
}
|
||
|
|
$fmt .= $format;
|
||
|
|
$args[] = $value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// prepend format string to argument list
|
||
|
|
array_unshift($args, $fmt);
|
||
|
|
|
||
|
|
// build output string from header and compressed data
|
||
|
|
return pack(...$args);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Send string, sending HTTP headers if necessary.
|
||
|
|
* Flush output after write if configure option is set.
|
||
|
|
*
|
||
|
|
* @param String $str
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
public function send(string $str): void
|
||
|
|
{
|
||
|
|
if ($this->need_headers) {
|
||
|
|
$this->sendHttpHeaders();
|
||
|
|
}
|
||
|
|
$this->need_headers = false;
|
||
|
|
|
||
|
|
$outputStream = $this->opt->getOutputStream();
|
||
|
|
|
||
|
|
if ($outputStream instanceof StreamInterface) {
|
||
|
|
$outputStream->write($str);
|
||
|
|
} else {
|
||
|
|
fwrite($outputStream, $str);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($this->opt->isFlushOutput()) {
|
||
|
|
// flush output buffer if it is on and flushable
|
||
|
|
$status = ob_get_status();
|
||
|
|
if (isset($status['flags']) && ($status['flags'] & PHP_OUTPUT_HANDLER_FLUSHABLE)) {
|
||
|
|
ob_flush();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Flush system buffers after flushing userspace output buffer
|
||
|
|
flush();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Is this file larger than large_file_size?
|
||
|
|
*
|
||
|
|
* @param string $path
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
public function isLargeFile(string $path): bool
|
||
|
|
{
|
||
|
|
if (!$this->opt->isStatFiles()) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
$stat = stat($path);
|
||
|
|
return $stat['size'] > $this->opt->getLargeFileSize();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Save file attributes for trailing CDR record.
|
||
|
|
*
|
||
|
|
* @param File $file
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
public function addToCdr(File $file): void
|
||
|
|
{
|
||
|
|
$file->ofs = $this->ofs;
|
||
|
|
$this->ofs = $this->ofs->add($file->getTotalLength());
|
||
|
|
$this->files[] = $file->getCdrFile();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Send ZIP64 CDR EOF (Central Directory Record End-of-File) record.
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
protected function addCdr64Eof(): void
|
||
|
|
{
|
||
|
|
$num_files = count($this->files);
|
||
|
|
$cdr_length = $this->cdr_ofs;
|
||
|
|
$cdr_offset = $this->ofs;
|
||
|
|
|
||
|
|
$fields = [
|
||
|
|
['V', static::ZIP64_CDR_EOF_SIGNATURE], // ZIP64 end of central file header signature
|
||
|
|
['P', 44], // Length of data below this header (length of block - 12) = 44
|
||
|
|
['v', static::ZIP_VERSION_MADE_BY], // Made by version
|
||
|
|
['v', Version::ZIP64], // Extract by version
|
||
|
|
['V', 0x00], // disk number
|
||
|
|
['V', 0x00], // no of disks
|
||
|
|
['P', $num_files], // no of entries on disk
|
||
|
|
['P', $num_files], // no of entries in cdr
|
||
|
|
['P', $cdr_length], // CDR size
|
||
|
|
['P', $cdr_offset], // CDR offset
|
||
|
|
];
|
||
|
|
|
||
|
|
$ret = static::packFields($fields);
|
||
|
|
$this->send($ret);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Send HTTP headers for this stream.
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
protected function sendHttpHeaders(): void
|
||
|
|
{
|
||
|
|
// grab content disposition
|
||
|
|
$disposition = $this->opt->getContentDisposition();
|
||
|
|
|
||
|
|
if ($this->output_name) {
|
||
|
|
// Various different browsers dislike various characters here. Strip them all for safety.
|
||
|
|
$safe_output = trim(str_replace(['"', "'", '\\', ';', "\n", "\r"], '', $this->output_name));
|
||
|
|
|
||
|
|
// Check if we need to UTF-8 encode the filename
|
||
|
|
$urlencoded = rawurlencode($safe_output);
|
||
|
|
$disposition .= "; filename*=UTF-8''{$urlencoded}";
|
||
|
|
}
|
||
|
|
|
||
|
|
$headers = [
|
||
|
|
'Content-Type' => $this->opt->getContentType(),
|
||
|
|
'Content-Disposition' => $disposition,
|
||
|
|
'Pragma' => 'public',
|
||
|
|
'Cache-Control' => 'public, must-revalidate',
|
||
|
|
'Content-Transfer-Encoding' => 'binary',
|
||
|
|
];
|
||
|
|
|
||
|
|
$call = $this->opt->getHttpHeaderCallback();
|
||
|
|
foreach ($headers as $key => $val) {
|
||
|
|
$call("$key: $val");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Send ZIP64 CDR Locator (Central Directory Record Locator) record.
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
protected function addCdr64Locator(): void
|
||
|
|
{
|
||
|
|
$cdr_offset = $this->ofs->add($this->cdr_ofs);
|
||
|
|
|
||
|
|
$fields = [
|
||
|
|
['V', static::ZIP64_CDR_LOCATOR_SIGNATURE], // ZIP64 end of central file header signature
|
||
|
|
['V', 0x00], // Disc number containing CDR64EOF
|
||
|
|
['P', $cdr_offset], // CDR offset
|
||
|
|
['V', 1], // Total number of disks
|
||
|
|
];
|
||
|
|
|
||
|
|
$ret = static::packFields($fields);
|
||
|
|
$this->send($ret);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Send CDR EOF (Central Directory Record End-of-File) record.
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
protected function addCdrEof(): void
|
||
|
|
{
|
||
|
|
$num_files = count($this->files);
|
||
|
|
$cdr_length = $this->cdr_ofs;
|
||
|
|
$cdr_offset = $this->ofs;
|
||
|
|
|
||
|
|
// grab comment (if specified)
|
||
|
|
$comment = $this->opt->getComment();
|
||
|
|
|
||
|
|
$fields = [
|
||
|
|
['V', static::CDR_EOF_SIGNATURE], // end of central file header signature
|
||
|
|
['v', 0x00], // disk number
|
||
|
|
['v', 0x00], // no of disks
|
||
|
|
['v', min($num_files, 0xFFFF)], // no of entries on disk
|
||
|
|
['v', min($num_files, 0xFFFF)], // no of entries in cdr
|
||
|
|
['V', $cdr_length->getLowFF()], // CDR size
|
||
|
|
['V', $cdr_offset->getLowFF()], // CDR offset
|
||
|
|
['v', strlen($comment)], // Zip Comment size
|
||
|
|
];
|
||
|
|
|
||
|
|
$ret = static::packFields($fields) . $comment;
|
||
|
|
$this->send($ret);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Clear all internal variables. Note that the stream object is not
|
||
|
|
* usable after this.
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
protected function clear(): void
|
||
|
|
{
|
||
|
|
$this->files = [];
|
||
|
|
$this->ofs = new Bigint();
|
||
|
|
$this->cdr_ofs = new Bigint();
|
||
|
|
$this->opt = new ArchiveOptions();
|
||
|
|
}
|
||
|
|
}
|