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当前路径:vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/OLE/ChainedBlockStream.php
<?php

namespace PhpOffice\PhpSpreadsheet\Shared\OLE;

use PhpOffice\PhpSpreadsheet\Shared\OLE;

class ChainedBlockStream
{
    /**
     * The OLE container of the file that is being read.
     *
     * @var OLE
     */
    public $ole;

    /**
     * Parameters specified by fopen().
     *
     * @var array
     */
    public $params;

    /**
     * The binary data of the file.
     *
     * @var string
     */
    public $data;

    /**
     * The file pointer.
     *
     * @var int byte offset
     */
    public $pos;

    /**
     * Implements support for fopen().
     * For creating streams using this wrapper, use OLE_PPS_File::getStream().
     *
     * @param string $path resource name including scheme, e.g.
     *                                    ole-chainedblockstream://oleInstanceId=1
     * @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)
     *
     * @return bool true on success
     */
    public function stream_open($path, $mode, $options, &$openedPath) // @codingStandardsIgnoreLine
    {
        if ($mode != 'r') {
            if ($options & STREAM_REPORT_ERRORS) {
                trigger_error('Only reading is supported', E_USER_WARNING);
            }

            return false;
        }

        // 25 is length of "ole-chainedblockstream://"
        parse_str(substr($path, 25), $this->params);
        if (!isset($this->params['oleInstanceId'], $this->params['blockId'], $GLOBALS['_OLE_INSTANCES'][$this->params['oleInstanceId']])) {
            if ($options & STREAM_REPORT_ERRORS) {
                trigger_error('OLE stream not found', E_USER_WARNING);
            }

            return false;
        }
        $this->ole = $GLOBALS['_OLE_INSTANCES'][$this->params['oleInstanceId']];

        $blockId = $this->params['blockId'];
        $this->data = '';
        if (isset($this->params['size']) && $this->params['size'] < $this->ole->bigBlockThreshold && $blockId != $this->ole->root->startBlock) {
            // Block id refers to small blocks
            $rootPos = $this->ole->_getBlockOffset($this->ole->root->startBlock);
            while ($blockId != -2) {
                $pos = $rootPos + $blockId * $this->ole->bigBlockSize;
                $blockId = $this->ole->sbat[$blockId];
                fseek($this->ole->_file_handle, $pos);
                $this->data .= fread($this->ole->_file_handle, $this->ole->bigBlockSize);
            }
        } else {
            // Block id refers to big blocks
            while ($blockId != -2) {
                $pos = $this->ole->_getBlockOffset($blockId);
                fseek($this->ole->_file_handle, $pos);
                $this->data .= fread($this->ole->_file_handle, $this->ole->bigBlockSize);
                $blockId = $this->ole->bbat[$blockId];
            }
        }
        if (isset($this->params['size'])) {
            $this->data = substr($this->data, 0, $this->params['size']);
        }

        if ($options & STREAM_USE_PATH) {
            $openedPath = $path;
        }

        return true;
    }

    /**
     * Implements support for fclose().
     */
    public function stream_close(): void // @codingStandardsIgnoreLine
    {
        $this->ole = null;
        unset($GLOBALS['_OLE_INSTANCES']);
    }

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

        return $s;
    }

    /**
     * Implements support for feof().
     *
     * @return bool TRUE if the file pointer is at EOF; otherwise FALSE
     */
    public function stream_eof() // @codingStandardsIgnoreLine
    {
        return $this->pos >= strlen($this->data);
    }

    /**
     * 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->pos;
    }

    /**
     * Implements support for fseek().
     *
     * @param int $offset byte offset
     * @param int $whence SEEK_SET, SEEK_CUR or SEEK_END
     *
     * @return bool
     */
    public function stream_seek($offset, $whence) // @codingStandardsIgnoreLine
    {
        if ($whence == SEEK_SET && $offset >= 0) {
            $this->pos = $offset;
        } elseif ($whence == SEEK_CUR && -$offset <= $this->pos) {
            $this->pos += $offset;
        } elseif ($whence == SEEK_END && -$offset <= count($this->data)) {
            $this->pos = strlen($this->data) + $offset;
        } else {
            return false;
        }

        return true;
    }

    /**
     * Implements support for fstat(). Currently the only supported field is
     * "size".
     *
     * @return array
     */
    public function stream_stat() // @codingStandardsIgnoreLine
    {
        return [
            'size' => strlen($this->data),
        ];
    }

    // Methods used by stream_wrapper_register() that are not implemented:
    // bool stream_flush ( void )
    // int stream_write ( string data )
    // bool rename ( string path_from, string path_to )
    // bool mkdir ( string path, int mode, int options )
    // bool rmdir ( string path, int options )
    // bool dir_opendir ( string path, int options )
    // array url_stat ( string path, int flags )
    // string dir_readdir ( void )
    // bool dir_rewinddir ( void )
    // bool dir_closedir ( void )
}
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