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<?php |
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namespace PhpOffice\PhpSpreadsheet\Shared\OLE; |
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use PhpOffice\PhpSpreadsheet\Shared\OLE; |
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class ChainedBlockStream |
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{ |
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/** |
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* The OLE container of the file that is being read. |
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* |
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* @var null|OLE |
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*/ |
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public $ole; |
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/** |
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* Parameters specified by fopen(). |
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* |
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* @var array |
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*/ |
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public $params; |
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/** |
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* The binary data of the file. |
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* |
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* @var string |
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*/ |
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public $data; |
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/** |
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* The file pointer. |
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* |
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* @var int byte offset |
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*/ |
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public $pos; |
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/** |
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* Implements support for fopen(). |
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* For creating streams using this wrapper, use OLE_PPS_File::getStream(). |
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* |
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* @param string $path resource name including scheme, e.g. |
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* ole-chainedblockstream://oleInstanceId=1 |
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* @param string $mode only "r" is supported |
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* @param int $options mask of STREAM_REPORT_ERRORS and STREAM_USE_PATH |
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* @param string $openedPath absolute path of the opened stream (out parameter) |
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* |
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* @return bool true on success |
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*/ |
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public function stream_open($path, $mode, $options, &$openedPath) // @codingStandardsIgnoreLine |
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{ |
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if ($mode[0] !== 'r') { |
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if ($options & STREAM_REPORT_ERRORS) { |
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trigger_error('Only reading is supported', E_USER_WARNING); |
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} |
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return false; |
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} |
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// 25 is length of "ole-chainedblockstream://" |
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parse_str(substr($path, 25), $this->params); |
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if (!isset($this->params['oleInstanceId'], $this->params['blockId'], $GLOBALS['_OLE_INSTANCES'][$this->params['oleInstanceId']])) { |
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if ($options & STREAM_REPORT_ERRORS) { |
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trigger_error('OLE stream not found', E_USER_WARNING); |
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} |
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return false; |
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} |
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$this->ole = $GLOBALS['_OLE_INSTANCES'][$this->params['oleInstanceId']]; |
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$blockId = $this->params['blockId']; |
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$this->data = ''; |
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if (isset($this->params['size']) && $this->params['size'] < $this->ole->bigBlockThreshold && $blockId != $this->ole->root->startBlock) { |
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// Block id refers to small blocks |
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$rootPos = $this->ole->getBlockOffset($this->ole->root->startBlock); |
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while ($blockId != -2) { |
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$pos = $rootPos + $blockId * $this->ole->bigBlockSize; |
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$blockId = $this->ole->sbat[$blockId]; |
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fseek($this->ole->_file_handle, $pos); |
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$this->data .= fread($this->ole->_file_handle, $this->ole->bigBlockSize); |
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} |
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} else { |
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// Block id refers to big blocks |
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while ($blockId != -2) { |
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$pos = $this->ole->getBlockOffset($blockId); |
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fseek($this->ole->_file_handle, $pos); |
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$this->data .= fread($this->ole->_file_handle, $this->ole->bigBlockSize); |
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$blockId = $this->ole->bbat[$blockId]; |
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} |
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} |
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if (isset($this->params['size'])) { |
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$this->data = substr($this->data, 0, $this->params['size']); |
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} |
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if ($options & STREAM_USE_PATH) { |
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$openedPath = $path; |
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} |
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return true; |
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} |
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/** |
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* Implements support for fclose(). |
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*/ |
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public function stream_close(): void // @codingStandardsIgnoreLine |
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{ |
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$this->ole = null; |
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unset($GLOBALS['_OLE_INSTANCES']); |
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} |
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/** |
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* Implements support for fread(), fgets() etc. |
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* |
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* @param int $count maximum number of bytes to read |
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* |
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* @return false|string |
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*/ |
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public function stream_read($count) // @codingStandardsIgnoreLine |
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{ |
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if ($this->stream_eof()) { |
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return false; |
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} |
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$s = substr($this->data, (int) $this->pos, $count); |
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$this->pos += $count; |
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return $s; |
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} |
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/** |
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* Implements support for feof(). |
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* |
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* @return bool TRUE if the file pointer is at EOF; otherwise FALSE |
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*/ |
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public function stream_eof() // @codingStandardsIgnoreLine |
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{ |
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return $this->pos >= strlen($this->data); |
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} |
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/** |
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* Returns the position of the file pointer, i.e. its offset into the file |
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* stream. Implements support for ftell(). |
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* |
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* @return int |
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*/ |
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public function stream_tell() // @codingStandardsIgnoreLine |
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{ |
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return $this->pos; |
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} |
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/** |
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* Implements support for fseek(). |
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* |
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* @param int $offset byte offset |
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* @param int $whence SEEK_SET, SEEK_CUR or SEEK_END |
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* |
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* @return bool |
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*/ |
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public function stream_seek($offset, $whence) // @codingStandardsIgnoreLine |
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{ |
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if ($whence == SEEK_SET && $offset >= 0) { |
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$this->pos = $offset; |
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} elseif ($whence == SEEK_CUR && -$offset <= $this->pos) { |
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$this->pos += $offset; |
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// @phpstan-ignore-next-line |
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} elseif ($whence == SEEK_END && -$offset <= count(/** @scrutinizer ignore-type */ $this->data)) { |
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$this->pos = strlen($this->data) + $offset; |
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} else { |
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return false; |
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} |
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1 |
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return true; |
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} |
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/** |
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* Implements support for fstat(). Currently the only supported field is |
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* "size". |
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* |
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* @return array |
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*/ |
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public function stream_stat() // @codingStandardsIgnoreLine |
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{ |
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return [ |
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'size' => strlen($this->data), |
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]; |
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} |
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// Methods used by stream_wrapper_register() that are not implemented: |
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// bool stream_flush ( void ) |
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// int stream_write ( string data ) |
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// bool rename ( string path_from, string path_to ) |
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// bool mkdir ( string path, int mode, int options ) |
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// bool rmdir ( string path, int options ) |
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// bool dir_opendir ( string path, int options ) |
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// array url_stat ( string path, int flags ) |
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// string dir_readdir ( void ) |
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// bool dir_rewinddir ( void ) |
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// bool dir_closedir ( void ) |
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} |
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PHPOffice /
PhpSpreadsheet
