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<?php
declare(strict_types=1);
namespace ZipStream;
use Psr\Http\Message\StreamInterface;
use ZipStream\Exception\OverflowException;
use ZipStream\Option\Archive as ArchiveOptions;
use ZipStream\Option\File as FileOptions;
use ZipStream\Option\Version;
/**
* ZipStream
*
* Streamed, dynamically generated zip archives.
*
* Usage:
*
* Streaming zip archives is a simple, three-step process:
*
* 1. Create the zip stream:
*
* $zip = new ZipStream('example.zip');
*
* 2. Add one or more files to the archive:
*
* * add first file
* $data = file_get_contents('some_file.gif');
* $zip->addFile('some_file.gif', $data);
*
* * add second file
* $data = file_get_contents('some_file.gif');
* $zip->addFile('another_file.png', $data);
*
* 3. Finish the zip stream:
*
* $zip->finish();
*
* You can also add an archive comment, add comments to individual files,
* and adjust the timestamp of files. See the API documentation for each
* method below for additional information.
*
* Example:
*
* // create a new zip stream object
* $zip = new ZipStream('some_files.zip');
*
* // list of local files
* $files = array('foo.txt', 'bar.jpg');
*
* // read and add each file to the archive
* foreach ($files as $path)
* $zip->addFile($path, file_get_contents($path));
*
* // write archive footer to stream
* $zip->finish();
*/
class ZipStream
{
/**
* This number corresponds to the ZIP version/OS used (2 bytes)
* From: https://www.iana.org/assignments/media-types/application/zip
* The upper byte (leftmost one) indicates the host system (OS) for the
* file. Software can use this information to determine
* the line record format for text files etc. The current
* mappings are:
*
* 0 - MS-DOS and OS/2 (F.A.T. file systems)
* 1 - Amiga 2 - VAX/VMS
* 3 - *nix 4 - VM/CMS
* 5 - Atari ST 6 - OS/2 H.P.F.S.
* 7 - Macintosh 8 - Z-System
* 9 - CP/M 10 thru 255 - unused
*
* The lower byte (rightmost one) indicates the version number of the
* software used to encode the file. The value/10
* indicates the major version number, and the value
* mod 10 is the minor version number.
* Here we are using 6 for the OS, indicating OS/2 H.P.F.S.
* to prevent file permissions issues upon extract (see #84)
* 0x603 is 00000110 00000011 in binary, so 6 and 3
*/
const ZIP_VERSION_MADE_BY = 0x603;
/**
* The following signatures end with 0x4b50, which in ASCII is PK,
* the initials of the inventor Phil Katz.
* See https://en.wikipedia.org/wiki/Zip_(file_format)#File_headers
*/
const FILE_HEADER_SIGNATURE = 0x04034b50;
const CDR_FILE_SIGNATURE = 0x02014b50;
const CDR_EOF_SIGNATURE = 0x06054b50;
const DATA_DESCRIPTOR_SIGNATURE = 0x08074b50;
const ZIP64_CDR_EOF_SIGNATURE = 0x06064b50;
const ZIP64_CDR_LOCATOR_SIGNATURE = 0x07064b50;
/**
* Global Options
*
* @var ArchiveOptions
*/
public $opt;
/**
* @var array
*/
public $files = [];
/**
* @var Bigint
*/
public $cdr_ofs;
/**
* @var Bigint
*/
public $ofs;
/**
* @var bool
*/
protected $need_headers;
/**
* @var null|String
*/
protected $output_name;
/**
* Create a new ZipStream object.
*
* Parameters:
*
* @param String $name - Name of output file (optional).
* @param ArchiveOptions $opt - Archive Options
*
* Large File Support:
*
* By default, the method addFileFromPath() will send send files
* larger than 20 megabytes along raw rather than attempting to
* compress them. You can change both the maximum size and the
* compression behavior using the largeFile* options above, with the
* following caveats:
*
* * For "small" files (e.g. files smaller than largeFileSize), the
* memory use can be up to twice that of the actual file. In other
* words, adding a 10 megabyte file to the archive could potentially
* occupy 20 megabytes of memory.
*
* * Enabling compression on large files (e.g. files larger than
* large_file_size) is extremely slow, because ZipStream has to pass
* over the large file once to calculate header information, and then
* again to compress and send the actual data.
*
* Examples:
*
* // create a new zip file named 'foo.zip'
* $zip = new ZipStream('foo.zip');
*
* // create a new zip file named 'bar.zip' with a comment
* $opt->setComment = 'this is a comment for the zip file.';
* $zip = new ZipStream('bar.zip', $opt);
*
* Notes:
*
* In order to let this library send HTTP headers, a filename must be given
* _and_ the option `sendHttpHeaders` must be `true`. This behavior is to
* allow software to send its own headers (including the filename), and
* still use this library.
*/
public function __construct(?string $name = null, ?ArchiveOptions $opt = null)
{
$this->opt = $opt ?: new ArchiveOptions();
$this->output_name = $name;
$this->need_headers = $name && $this->opt->isSendHttpHeaders();
$this->cdr_ofs = new Bigint();
$this->ofs = new Bigint();
}
/**
* addFile
*
* Add a file to the archive.
*
* @param String $name - path of file in archive (including directory).
* @param String $data - contents of file
* @param FileOptions $options
*
* File Options:
* time - Last-modified timestamp (seconds since the epoch) of
* this file. Defaults to the current time.
* comment - Comment related to this file.
* method - Storage method for file ("store" or "deflate")
*
* Examples:
*
* // add a file named 'foo.txt'
* $data = file_get_contents('foo.txt');
* $zip->addFile('foo.txt', $data);
*
* // add a file named 'bar.jpg' with a comment and a last-modified
* // time of two hours ago
* $data = file_get_contents('bar.jpg');
* $opt->setTime = time() - 2 * 3600;
* $opt->setComment = 'this is a comment about bar.jpg';
* $zip->addFile('bar.jpg', $data, $opt);
*/
public function addFile(string $name, string $data, ?FileOptions $options = null): void
{
$options = $options ?: new FileOptions();
$options->defaultTo($this->opt);
$file = new File($this, $name, $options);
$file->processData($data);
}
/**
* addFileFromPath
*
* Add a file at path to the archive.
*
* Note that large files may be compressed differently than smaller
* files; see the "Large File Support" section above for more
* information.
*
* @param String $name - name of file in archive (including directory path).
* @param String $path - path to file on disk (note: paths should be encoded using
* UNIX-style forward slashes -- e.g '/path/to/some/file').
* @param FileOptions $options
*
* File Options:
* time - Last-modified timestamp (seconds since the epoch) of
* this file. Defaults to the current time.
* comment - Comment related to this file.
* method - Storage method for file ("store" or "deflate")
*
* Examples:
*
* // add a file named 'foo.txt' from the local file '/tmp/foo.txt'
* $zip->addFileFromPath('foo.txt', '/tmp/foo.txt');
*
* // add a file named 'bigfile.rar' from the local file
* // '/usr/share/bigfile.rar' with a comment and a last-modified
* // time of two hours ago
* $path = '/usr/share/bigfile.rar';
* $opt->setTime = time() - 2 * 3600;
* $opt->setComment = 'this is a comment about bar.jpg';
* $zip->addFileFromPath('bigfile.rar', $path, $opt);
*
* @return void
* @throws \ZipStream\Exception\FileNotFoundException
* @throws \ZipStream\Exception\FileNotReadableException
*/
public function addFileFromPath(string $name, string $path, ?FileOptions $options = null): void
{
$options = $options ?: new FileOptions();
$options->defaultTo($this->opt);
$file = new File($this, $name, $options);
$file->processPath($path);
}
/**
* addFileFromStream
*
* Add an open stream to the archive.
*
* @param String $name - path of file in archive (including directory).
* @param resource $stream - contents of file as a stream resource
* @param FileOptions $options
*
* File Options:
* time - Last-modified timestamp (seconds since the epoch) of
* this file. Defaults to the current time.
* comment - Comment related to this file.
*
* Examples:
*
* // create a temporary file stream and write text to it
* $fp = tmpfile();
* fwrite($fp, 'The quick brown fox jumped over the lazy dog.');
*
* // add a file named 'streamfile.txt' from the content of the stream
* $x->addFileFromStream('streamfile.txt', $fp);
*
* @return void
*/
public function addFileFromStream(string $name, $stream, ?FileOptions $options = null): void
{
$options = $options ?: new FileOptions();
$options->defaultTo($this->opt);
$file = new File($this, $name, $options);
$file->processStream(new DeflateStream($stream));
}
/**
* addFileFromPsr7Stream
*
* Add an open stream to the archive.
*
* @param String $name - path of file in archive (including directory).
* @param StreamInterface $stream - contents of file as a stream resource
* @param FileOptions $options
*
* File Options:
* time - Last-modified timestamp (seconds since the epoch) of
* this file. Defaults to the current time.
* comment - Comment related to this file.
*
* Examples:
*
* // create a temporary file stream and write text to it
* $fp = tmpfile();
* fwrite($fp, 'The quick brown fox jumped over the lazy dog.');
*
* // add a file named 'streamfile.txt' from the content of the stream
* $x->addFileFromPsr7Stream('streamfile.txt', $fp);
*
* @return void
*/
public function addFileFromPsr7Stream(
string $name,
StreamInterface $stream,
?FileOptions $options = null
): void {
$options = $options ?: new FileOptions();
$options->defaultTo($this->opt);
$file = new File($this, $name, $options);
$file->processStream($stream);
}
/**
* finish
*
* Write zip footer to stream.
*
* Example:
*
* // add a list of files to the archive
* $files = array('foo.txt', 'bar.jpg');
* foreach ($files as $path)
* $zip->addFile($path, file_get_contents($path));
*
* // write footer to stream
* $zip->finish();
* @return void
*
* @throws OverflowException
*/
public function finish(): void
{
// add trailing cdr file records
foreach ($this->files as $cdrFile) {
$this->send($cdrFile);
$this->cdr_ofs = $this->cdr_ofs->add(Bigint::init(strlen($cdrFile)));
}
// Add 64bit headers (if applicable)
if (count($this->files) >= 0xFFFF ||
$this->cdr_ofs->isOver32() ||
$this->ofs->isOver32()) {
if (!$this->opt->isEnableZip64()) {
throw new OverflowException();
}
$this->addCdr64Eof();
$this->addCdr64Locator();
}
// add trailing cdr eof record
$this->addCdrEof();
// The End
$this->clear();
}
/**
* 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);
}
/**
* Create a format string and argument list for pack(), then call
* 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();
}
$this->need_headers = false;
fwrite($this->opt->getOutputStream(), $str);
if ($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();
}
}
/**
* 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 = array(
'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();
}
/**
* 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();
}
}