<?php

namespace PhpOffice\PhpSpreadsheet\Shared;

/**
 * Copyright (c) 2006 - 2016 PhpSpreadsheet.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * @category   PhpSpreadsheet
 *
 * @copyright  Copyright (c) 2006 - 2016 PhpSpreadsheet (https://github.com/PHPOffice/PhpSpreadsheet)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 */
class ZipStreamWrapper
{
    /**
     * Internal ZipAcrhive.
     *
     * @var ZipArchive
     */
    private $archive;

    /**
     * Filename in ZipAcrhive.
     *
     * @var string
     */
    private $fileNameInArchive = '';

    /**
     * Position in file.
     *
     * @var int
     */
    private $position = 0;

    /**
     * Data.
     *
     * @var mixed
     */
    private $data = '';

    /**
     * Register wrapper.
     */
    public static function register()
    {
        @stream_wrapper_unregister('zip');
        @stream_wrapper_register('zip', __CLASS__);
    }

    /**
     * Implements support for fopen().
     *
     * @param string $path resource name including scheme, e.g.
     * @param string $mode only "r" is supported
     * @param int $options mask of STREAM_REPORT_ERRORS and STREAM_USE_PATH
     * @param string &$openedPath absolute path of the opened stream (out parameter)
     *
     * @throws \PhpOffice\PhpSpreadsheet\Reader\Exception
     *
     * @return bool true on success
     */
    public function stream_open($path, $mode, $options, &$opened_path) // @codingStandardsIgnoreLine
    {
        // Check for mode
        if ($mode[0] != 'r') {
            throw new \PhpOffice\PhpSpreadsheet\Reader\Exception('Mode ' . $mode . ' is not supported. Only read mode is supported.');
        }

        $pos = strrpos($path, '#');
        $url['host'] = substr($path, 6, $pos - 6); // 6: strlen('zip://')
        $url['fragment'] = substr($path, $pos + 1);

        // Open archive
        $zipClass = \PhpOffice\PhpSpreadsheet\Settings::getZipClass();
        $this->archive = new $zipClass();
        $this->archive->open($url['host']);

        $this->fileNameInArchive = $url['fragment'];
        $this->position = 0;
        $this->data = $this->archive->getFromName($this->fileNameInArchive);

        return true;
    }

    /**
     * Implements support for fstat().
     *
     * @return string
     */
    public function statName()
    {
        return $this->fileNameInArchive;
    }

    /**
     * Implements support for fstat().
     *
     * @return string
     */
    public function url_stat() // @codingStandardsIgnoreLine
    {
        return $this->statName();
    }

    /**
     * Implements support for fstat().
     *
     * @return bool
     */
    public function stream_stat() // @codingStandardsIgnoreLine
    {
        return $this->archive->statName($this->fileNameInArchive);
    }

    /**
     * Implements support for fread(), fgets() etc.
     *
     * @param int $count maximum number of bytes to read
     *
     * @return string
     */
    public function stream_read($count) // @codingStandardsIgnoreLine
    {
        $ret = substr($this->data, $this->position, $count);
        $this->position += strlen($ret);

        return $ret;
    }

    /**
     * Returns the position of the file pointer, i.e. its offset into the file
     * stream. Implements support for ftell().
     *
     * @return int
     */
    public function stream_tell() // @codingStandardsIgnoreLine
    {
        return $this->position;
    }

    /**
     * EOF stream.
     *
     * @return bool
     */
    public function stream_eof() // @codingStandardsIgnoreLine
    {
        return $this->position >= strlen($this->data);
    }

    /**
     * Seek stream.
     *
     * @param int $offset byte offset
     * @param int $whence SEEK_SET, SEEK_CUR or SEEK_END
     *
     * @return bool
     */
    public function stream_seek($offset, $whence) // @codingStandardsIgnoreLine
    {
        switch ($whence) {
            case SEEK_SET:
                if ($offset < strlen($this->data) && $offset >= 0) {
                    $this->position = $offset;

                    return true;
                }

                return false;
            case SEEK_CUR:
                if ($offset >= 0) {
                    $this->position += $offset;

                    return true;
                }

                return false;
            case SEEK_END:
                if (strlen($this->data) + $offset >= 0) {
                    $this->position = strlen($this->data) + $offset;

                    return true;
                }

                return false;
            default:
                return false;
        }
    }
}