<?php

namespace Tassos\Vendor\splitbrain\PHPArchive;

/**
 * Class Tar
 *
 * Creates or extracts Tar archives. Supports gz and bzip compression
 *
 * Long pathnames (>100 chars) are supported in POSIX ustar and GNU longlink formats.
 *
 * @author  Andreas Gohr <andi@splitbrain.org>
 * @package splitbrain\PHPArchive
 * @license MIT
 */
class Tar extends Archive
{
    protected $file = '';
    protected $comptype = Archive::COMPRESS_AUTO;
    protected $complevel = 9;
    protected $fh;
    protected $memory = '';
    protected $closed = \true;
    protected $writeaccess = \false;
    /**
     * Sets the compression to use
     *
     * @param int $level Compression level (0 to 9)
     * @param int $type Type of compression to use (use COMPRESS_* constants)
     * @throws ArchiveIllegalCompressionException
     */
    public function setCompression($level = 9, $type = Archive::COMPRESS_AUTO)
    {
        $this->compressioncheck($type);
        if ($level < -1 || $level > 9) {
            throw new ArchiveIllegalCompressionException('Compression level should be between -1 and 9');
        }
        $this->comptype = $type;
        $this->complevel = $level;
        if ($level == 0) {
            $this->comptype = Archive::COMPRESS_NONE;
        }
        if ($type == Archive::COMPRESS_NONE) {
            $this->complevel = 0;
        }
    }
    /**
     * Open an existing TAR file for reading
     *
     * @param string $file
     * @throws ArchiveIOException
     * @throws ArchiveIllegalCompressionException
     */
    public function open($file)
    {
        $this->file = $file;
        // update compression to mach file
        if ($this->comptype == Tar::COMPRESS_AUTO) {
            $this->setCompression($this->complevel, $this->filetype($file));
        }
        // open file handles
        if ($this->comptype === Archive::COMPRESS_GZIP) {
            $this->fh = @\gzopen($this->file, 'rb');
        } elseif ($this->comptype === Archive::COMPRESS_BZIP) {
            $this->fh = @\bzopen($this->file, 'r');
        } else {
            $this->fh = @\fopen($this->file, 'rb');
        }
        if (!$this->fh) {
            throw new ArchiveIOException('Could not open file for reading: ' . $this->file);
        }
        $this->closed = \false;
    }
    /**
     * Read the contents of a TAR archive
     *
     * This function lists the files stored in the archive
     *
     * The archive is closed afer reading the contents, because rewinding is not possible in bzip2 streams.
     * Reopen the file with open() again if you want to do additional operations
     *
     * @throws ArchiveIOException
     * @throws ArchiveCorruptedException
     * @returns FileInfo[]
     */
    public function contents()
    {
        $result = array();
        foreach ($this->yieldContents() as $fileinfo) {
            $result[] = $fileinfo;
        }
        return $result;
    }
    /**
     * Read the contents of a TAR archive and return each entry using yield
     * for memory efficiency.
     *
     * @see contents()
     * @throws ArchiveIOException
     * @throws ArchiveCorruptedException
     * @returns FileInfo[]
     */
    public function yieldContents()
    {
        if ($this->closed || !$this->file) {
            throw new ArchiveIOException('Can not read from a closed archive');
        }
        while ($read = $this->readbytes(512)) {
            $header = $this->parseHeader($read);
            if (!\is_array($header)) {
                continue;
            }
            $this->skipbytes(\ceil($header['size'] / 512) * 512);
            (yield $this->header2fileinfo($header));
        }
        $this->close();
    }
    /**
     * Extract an existing TAR archive
     *
     * The $strip parameter allows you to strip a certain number of path components from the filenames
     * found in the tar file, similar to the --strip-components feature of GNU tar. This is triggered when
     * an integer is passed as $strip.
     * Alternatively a fixed string prefix may be passed in $strip. If the filename matches this prefix,
     * the prefix will be stripped. It is recommended to give prefixes with a trailing slash.
     *
     * By default this will extract all files found in the archive. You can restrict the output using the $include
     * and $exclude parameter. Both expect a full regular expression (including delimiters and modifiers). If
     * $include is set only files that match this expression will be extracted. Files that match the $exclude
     * expression will never be extracted. Both parameters can be used in combination. Expressions are matched against
     * stripped filenames as described above.
     *
     * The archive is closed afer reading the contents, because rewinding is not possible in bzip2 streams.
     * Reopen the file with open() again if you want to do additional operations
     *
     * @param string $outdir the target directory for extracting
     * @param int|string $strip either the number of path components or a fixed prefix to strip
     * @param string $exclude a regular expression of files to exclude
     * @param string $include a regular expression of files to include
     * @throws ArchiveIOException
     * @throws ArchiveCorruptedException
     * @return FileInfo[]
     */
    public function extract($outdir, $strip = '', $exclude = '', $include = '')
    {
        if ($this->closed || !$this->file) {
            throw new ArchiveIOException('Can not read from a closed archive');
        }
        $outdir = \rtrim($outdir, '/');
        @\mkdir($outdir, 0777, \true);
        if (!\is_dir($outdir)) {
            throw new ArchiveIOException("Could not create directory '{$outdir}'");
        }
        $extracted = array();
        while ($dat = $this->readbytes(512)) {
            // read the file header
            $header = $this->parseHeader($dat);
            if (!\is_array($header)) {
                continue;
            }
            $fileinfo = $this->header2fileinfo($header);
            // apply strip rules
            $fileinfo->strip($strip);
            // skip unwanted files
            if (!\strlen($fileinfo->getPath()) || !$fileinfo->matchExpression($include, $exclude)) {
                $this->skipbytes(\ceil($header['size'] / 512) * 512);
                continue;
            }
            // create output directory
            $output = $outdir . '/' . $fileinfo->getPath();
            $directory = $fileinfo->getIsdir() ? $output : \dirname($output);
            if (!\file_exists($directory)) {
                \mkdir($directory, 0777, \true);
            }
            // extract data
            if (!$fileinfo->getIsdir()) {
                $fp = @\fopen($output, "wb");
                if (!$fp) {
                    throw new ArchiveIOException('Could not open file for writing: ' . $output);
                }
                $size = \floor($header['size'] / 512);
                for ($i = 0; $i < $size; $i++) {
                    \fwrite($fp, $this->readbytes(512), 512);
                }
                if ($header['size'] % 512 != 0) {
                    \fwrite($fp, $this->readbytes(512), $header['size'] % 512);
                }
                \fclose($fp);
                @\touch($output, $fileinfo->getMtime());
                @\chmod($output, $fileinfo->getMode());
            } else {
                $this->skipbytes(\ceil($header['size'] / 512) * 512);
                // the size is usually 0 for directories
            }
            if (\is_callable($this->callback)) {
                \call_user_func($this->callback, $fileinfo);
            }
            $extracted[] = $fileinfo;
        }
        $this->close();
        return $extracted;
    }
    /**
     * Create a new TAR file
     *
     * If $file is empty, the tar file will be created in memory
     *
     * @param string $file
     * @throws ArchiveIOException
     * @throws ArchiveIllegalCompressionException
     */
    public function create($file = '')
    {
        $this->file = $file;
        $this->memory = '';
        $this->fh = 0;
        if ($this->file) {
            // determine compression
            if ($this->comptype == Archive::COMPRESS_AUTO) {
                $this->setCompression($this->complevel, $this->filetype($file));
            }
            if ($this->comptype === Archive::COMPRESS_GZIP) {
                $this->fh = @\gzopen($this->file, 'wb' . $this->complevel);
            } elseif ($this->comptype === Archive::COMPRESS_BZIP) {
                $this->fh = @\bzopen($this->file, 'w');
            } else {
                $this->fh = @\fopen($this->file, 'wb');
            }
            if (!$this->fh) {
                throw new ArchiveIOException('Could not open file for writing: ' . $this->file);
            }
        }
        $this->writeaccess = \true;
        $this->closed = \false;
    }
    /**
     * Add a file to the current TAR archive using an existing file in the filesystem
     *
     * @param string $file path to the original file
     * @param string|FileInfo $fileinfo either the name to us in archive (string) or a FileInfo oject with all meta data, empty to take from original
     * @throws ArchiveCorruptedException when the file changes while reading it, the archive will be corrupt and should be deleted
     * @throws ArchiveIOException there was trouble reading the given file, it was not added
     * @throws FileInfoException trouble reading file info, it was not added
     */
    public function addFile($file, $fileinfo = '')
    {
        if (\is_string($fileinfo)) {
            $fileinfo = FileInfo::fromPath($file, $fileinfo);
        }
        if ($this->closed) {
            throw new ArchiveIOException('Archive has been closed, files can no longer be added');
        }
        // create file header
        $this->writeFileHeader($fileinfo);
        // write data, but only if we have data to write.
        // note: on Windows fopen() on a directory will fail, so we prevent
        // errors on Windows by testing if we have data to write.
        if (!$fileinfo->getIsdir() && $fileinfo->getSize() > 0) {
            $read = 0;
            $fp = @\fopen($file, 'rb');
            if (!$fp) {
                throw new ArchiveIOException('Could not open file for reading: ' . $file);
            }
            while (!\feof($fp)) {
                $data = \fread($fp, 512);
                $read += \strlen($data);
                if ($data === \false) {
                    break;
                }
                if ($data === '') {
                    break;
                }
                $packed = \pack("a512", $data);
                $this->writebytes($packed);
            }
            \fclose($fp);
            if ($read != $fileinfo->getSize()) {
                $this->close();
                throw new ArchiveCorruptedException("The size of {$file} changed while reading, archive corrupted. read {$read} expected " . $fileinfo->getSize());
            }
        }
        if (\is_callable($this->callback)) {
            \call_user_func($this->callback, $fileinfo);
        }
    }
    /**
     * Add a file to the current TAR archive using the given $data as content
     *
     * @param string|FileInfo $fileinfo either the name to us in archive (string) or a FileInfo oject with all meta data
     * @param string          $data     binary content of the file to add
     * @throws ArchiveIOException
     */
    public function addData($fileinfo, $data)
    {
        if (\is_string($fileinfo)) {
            $fileinfo = new FileInfo($fileinfo);
        }
        if ($this->closed) {
            throw new ArchiveIOException('Archive has been closed, files can no longer be added');
        }
        $len = \strlen($data);
        $fileinfo->setSize($len);
        $this->writeFileHeader($fileinfo);
        for ($s = 0; $s < $len; $s += 512) {
            $this->writebytes(\pack("a512", \substr($data, $s, 512)));
        }
        if (\is_callable($this->callback)) {
            \call_user_func($this->callback, $fileinfo);
        }
    }
    /**
     * Add the closing footer to the archive if in write mode, close all file handles
     *
     * After a call to this function no more data can be added to the archive, for
     * read access no reading is allowed anymore
     *
     * "Physically, an archive consists of a series of file entries terminated by an end-of-archive entry, which
     * consists of two 512 blocks of zero bytes"
     *
     * @link http://www.gnu.org/software/tar/manual/html_chapter/tar_8.html#SEC134
     * @throws ArchiveIOException
     */
    public function close()
    {
        if ($this->closed) {
            return;
        }
        // we did this already
        // write footer
        if ($this->writeaccess) {
            $this->writebytes(\pack("a512", ""));
            $this->writebytes(\pack("a512", ""));
        }
        // close file handles
        if ($this->file) {
            if ($this->comptype === Archive::COMPRESS_GZIP) {
                \gzclose($this->fh);
            } elseif ($this->comptype === Archive::COMPRESS_BZIP) {
                \bzclose($this->fh);
            } else {
                \fclose($this->fh);
            }
            $this->file = '';
            $this->fh = 0;
        }
        $this->writeaccess = \false;
        $this->closed = \true;
    }
    /**
     * Returns the created in-memory archive data
     *
     * This implicitly calls close() on the Archive
     * @throws ArchiveIOException
     */
    public function getArchive()
    {
        $this->close();
        if ($this->comptype === Archive::COMPRESS_AUTO) {
            $this->comptype = Archive::COMPRESS_NONE;
        }
        if ($this->comptype === Archive::COMPRESS_GZIP) {
            return \gzencode($this->memory, $this->complevel);
        }
        if ($this->comptype === Archive::COMPRESS_BZIP) {
            return \bzcompress($this->memory);
        }
        return $this->memory;
    }
    /**
     * Save the created in-memory archive data
     *
     * Note: It more memory effective to specify the filename in the create() function and
     * let the library work on the new file directly.
     *
     * @param string $file
     * @throws ArchiveIOException
     * @throws ArchiveIllegalCompressionException
     */
    public function save($file)
    {
        if ($this->comptype === Archive::COMPRESS_AUTO) {
            $this->setCompression($this->complevel, $this->filetype($file));
        }
        if (!@\file_put_contents($file, $this->getArchive())) {
            throw new ArchiveIOException('Could not write to file: ' . $file);
        }
    }
    /**
     * Read from the open file pointer
     *
     * @param int $length bytes to read
     * @return string
     */
    protected function readbytes($length)
    {
        if ($this->comptype === Archive::COMPRESS_GZIP) {
            return @\gzread($this->fh, $length);
        } elseif ($this->comptype === Archive::COMPRESS_BZIP) {
            return @\bzread($this->fh, $length);
        } else {
            return @\fread($this->fh, $length);
        }
    }
    /**
     * Write to the open filepointer or memory
     *
     * @param string $data
     * @throws ArchiveIOException
     * @return int number of bytes written
     */
    protected function writebytes($data)
    {
        if (!$this->file) {
            $this->memory .= $data;
            $written = \strlen($data);
        } elseif ($this->comptype === Archive::COMPRESS_GZIP) {
            $written = @\gzwrite($this->fh, $data);
        } elseif ($this->comptype === Archive::COMPRESS_BZIP) {
            $written = @\bzwrite($this->fh, $data);
        } else {
            $written = @\fwrite($this->fh, $data);
        }
        if ($written === \false) {
            throw new ArchiveIOException('Failed to write to archive stream');
        }
        return $written;
    }
    /**
     * Skip forward in the open file pointer
     *
     * This is basically a wrapper around seek() (and a workaround for bzip2)
     *
     * @param int $bytes seek to this position
     */
    protected function skipbytes($bytes)
    {
        if ($this->comptype === Archive::COMPRESS_GZIP) {
            @\gzseek($this->fh, $bytes, \SEEK_CUR);
        } elseif ($this->comptype === Archive::COMPRESS_BZIP) {
            // there is no seek in bzip2, we simply read on
            // bzread allows to read a max of 8kb at once
            while ($bytes) {
                $toread = \min(8192, $bytes);
                @\bzread($this->fh, $toread);
                $bytes -= $toread;
            }
        } else {
            @\fseek($this->fh, $bytes, \SEEK_CUR);
        }
    }
    /**
     * Write the given file meta data as header
     *
     * @param FileInfo $fileinfo
     * @throws ArchiveIOException
     */
    protected function writeFileHeader(FileInfo $fileinfo)
    {
        $this->writeRawFileHeader($fileinfo->getPath(), $fileinfo->getUid(), $fileinfo->getGid(), $fileinfo->getMode(), $fileinfo->getSize(), $fileinfo->getMtime(), $fileinfo->getIsdir() ? '5' : '0');
    }
    /**
     * Write a file header to the stream
     *
     * @param string $name
     * @param int $uid
     * @param int $gid
     * @param int $perm
     * @param int $size
     * @param int $mtime
     * @param string $typeflag Set to '5' for directories
     * @throws ArchiveIOException
     */
    protected function writeRawFileHeader($name, $uid, $gid, $perm, $size, $mtime, $typeflag = '')
    {
        // handle filename length restrictions
        $prefix = '';
        $namelen = \strlen($name);
        if ($namelen > 100) {
            $file = \basename($name);
            $dir = \dirname($name);
            if (\strlen($file) > 100 || \strlen($dir) > 155) {
                // we're still too large, let's use GNU longlink
                $this->writeRawFileHeader('././@LongLink', 0, 0, 0, $namelen, 0, 'L');
                for ($s = 0; $s < $namelen; $s += 512) {
                    $this->writebytes(\pack("a512", \substr($name, $s, 512)));
                }
                $name = \substr($name, 0, 100);
                // cut off name
            } else {
                // we're fine when splitting, use POSIX ustar
                $prefix = $dir;
                $name = $file;
            }
        }
        // values are needed in octal
        $uid = \sprintf("%6s ", \decoct($uid));
        $gid = \sprintf("%6s ", \decoct($gid));
        $perm = \sprintf("%6s ", \decoct($perm));
        $size = \sprintf("%11s ", \decoct($size));
        $mtime = \sprintf("%11s", \decoct($mtime));
        $data_first = \pack("a100a8a8a8a12A12", $name, $perm, $uid, $gid, $size, $mtime);
        $data_last = \pack("a1a100a6a2a32a32a8a8a155a12", $typeflag, '', 'ustar', '', '', '', '', '', $prefix, "");
        for ($i = 0, $chks = 0; $i < 148; $i++) {
            $chks += \ord($data_first[$i]);
        }
        for ($i = 156, $chks += 256, $j = 0; $i < 512; $i++, $j++) {
            $chks += \ord($data_last[$j]);
        }
        $this->writebytes($data_first);
        $chks = \pack("a8", \sprintf("%6s ", \decoct($chks)));
        $this->writebytes($chks . $data_last);
    }
    /**
     * Decode the given tar file header
     *
     * @param string $block a 512 byte block containing the header data
     * @return array|false returns false when this was a null block
     * @throws ArchiveCorruptedException
     */
    protected function parseHeader($block)
    {
        if (!$block || \strlen($block) != 512) {
            throw new ArchiveCorruptedException('Unexpected length of header');
        }
        // null byte blocks are ignored
        if (\trim($block) === '') {
            return \false;
        }
        for ($i = 0, $chks = 0; $i < 148; $i++) {
            $chks += \ord($block[$i]);
        }
        for ($i = 156, $chks += 256; $i < 512; $i++) {
            $chks += \ord($block[$i]);
        }
        $header = @\unpack("a100filename/a8perm/a8uid/a8gid/a12size/a12mtime/a8checksum/a1typeflag/a100link/a6magic/a2version/a32uname/a32gname/a8devmajor/a8devminor/a155prefix", $block);
        if (!$header) {
            throw new ArchiveCorruptedException('Failed to parse header');
        }
        $return['checksum'] = \OctDec(\trim($header['checksum']));
        if ($return['checksum'] != $chks) {
            throw new ArchiveCorruptedException('Header does not match its checksum');
        }
        $return['filename'] = \trim($header['filename']);
        $return['perm'] = \OctDec(\trim($header['perm']));
        $return['uid'] = \OctDec(\trim($header['uid']));
        $return['gid'] = \OctDec(\trim($header['gid']));
        $return['size'] = \OctDec(\trim($header['size']));
        $return['mtime'] = \OctDec(\trim($header['mtime']));
        $return['typeflag'] = $header['typeflag'];
        $return['link'] = \trim($header['link']);
        $return['uname'] = \trim($header['uname']);
        $return['gname'] = \trim($header['gname']);
        // Handle ustar Posix compliant path prefixes
        if (\trim($header['prefix'])) {
            $return['filename'] = \trim($header['prefix']) . '/' . $return['filename'];
        }
        // Handle Long-Link entries from GNU Tar
        if ($return['typeflag'] == 'L') {
            // following data block(s) is the filename
            $filename = \trim($this->readbytes(\ceil($return['size'] / 512) * 512));
            // next block is the real header
            $block = $this->readbytes(512);
            $return = $this->parseHeader($block);
            // overwrite the filename
            $return['filename'] = $filename;
        }
        return $return;
    }
    /**
     * Creates a FileInfo object from the given parsed header
     *
     * @param $header
     * @return FileInfo
     */
    protected function header2fileinfo($header)
    {
        $fileinfo = new FileInfo();
        $fileinfo->setPath($header['filename']);
        $fileinfo->setMode($header['perm']);
        $fileinfo->setUid($header['uid']);
        $fileinfo->setGid($header['gid']);
        $fileinfo->setSize($header['size']);
        $fileinfo->setMtime($header['mtime']);
        $fileinfo->setOwner($header['uname']);
        $fileinfo->setGroup($header['gname']);
        $fileinfo->setIsdir((bool) $header['typeflag']);
        return $fileinfo;
    }
    /**
     * Checks if the given compression type is available and throws an exception if not
     *
     * @param $comptype
     * @throws ArchiveIllegalCompressionException
     */
    protected function compressioncheck($comptype)
    {
        if ($comptype === Archive::COMPRESS_GZIP && !\function_exists('gzopen')) {
            throw new ArchiveIllegalCompressionException('No gzip support available');
        }
        if ($comptype === Archive::COMPRESS_BZIP && !\function_exists('bzopen')) {
            throw new ArchiveIllegalCompressionException('No bzip2 support available');
        }
    }
    /**
     * Guesses the wanted compression from the given file
     *
     * Uses magic bytes for existing files, the file extension otherwise
     *
     * You don't need to call this yourself. It's used when you pass Archive::COMPRESS_AUTO somewhere
     *
     * @param string $file
     * @return int
     */
    public function filetype($file)
    {
        // for existing files, try to read the magic bytes
        if (\file_exists($file) && \is_readable($file) && \filesize($file) > 5) {
            $fh = @\fopen($file, 'rb');
            if (!$fh) {
                return \false;
            }
            $magic = \fread($fh, 5);
            \fclose($fh);
            if (\strpos($magic, "BZ") === 0) {
                return Archive::COMPRESS_BZIP;
            }
            if (\strpos($magic, "\x1f\x8b") === 0) {
                return Archive::COMPRESS_GZIP;
            }
        }
        // otherwise rely on file name
        $file = \strtolower($file);
        if (\substr($file, -3) == '.gz' || \substr($file, -4) == '.tgz') {
            return Archive::COMPRESS_GZIP;
        } elseif (\substr($file, -4) == '.bz2' || \substr($file, -4) == '.tbz') {
            return Archive::COMPRESS_BZIP;
        }
        return Archive::COMPRESS_NONE;
    }
}