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<?php |
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/** |
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* @package CleverStyle CMS |
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* @author Nazar Mokrynskyi <[email protected]> |
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* @copyright Copyright (c) 2016, Nazar Mokrynskyi |
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* @license MIT License, see license.txt |
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*/ |
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namespace cs\Request; |
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use |
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cs\Request; |
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/** |
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* Stream wrapper created in order to be used as virtual stream which actually represents segment of request data stream, this way we avoid data duplication |
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* |
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* Usage: `fopen('request-data://offset:size', 'r')` |
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* |
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* `offset` and `size` are used to specify segment of data within request data stream, only `r` mode is supported |
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*/ |
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class Data_sub_stream { |
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/** |
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* Offset of current file inside parent input stream |
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* |
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* @var int |
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*/ |
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protected $offset; |
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/** |
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* Size of current file in bytes |
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* |
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* @var int |
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*/ |
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protected $size; |
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/** |
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* @var array |
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*/ |
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protected $stat = []; |
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/** |
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* Current position of a stream |
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* |
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* @var int |
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*/ |
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protected $position = 0; |
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/** |
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* @var resource |
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*/ |
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protected $data_stream; |
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function stream_open ($path, $mode) { |
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if ($mode != 'r' && $mode != 'rb') { |
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return false; |
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} |
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$this->data_stream = Request::instance()->data_stream; |
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list($this->offset, $this->size) = explode(':', explode('://', $path)[1]); |
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$stat = &$this->stat; |
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$stat[0] = $stat['dev'] = 0; |
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$stat[1] = $stat['ino'] = 0; |
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$stat[2] = $stat['mode'] = 0; |
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$stat[3] = $stat['nlink'] = 0; |
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$stat[4] = $stat['uid'] = 0; |
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$stat[5] = $stat['gid'] = 0; |
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$stat[6] = $stat['rdev'] = 0; |
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$stat[7] = $stat['size'] = $this->size; |
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$time = time(); |
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$stat[8] = $stat['atime'] = $time; |
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$stat[9] = $stat['mtime'] = $time; |
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$stat[10] = $stat['ctime'] = $time; |
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$stat[11] = $stat['blksize'] = -1; |
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$stat[12] = $stat['blocks'] = -1; |
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return true; |
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} |
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/** |
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* @param int $length |
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* |
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* @return false|string |
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*/ |
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function stream_read ($length) { |
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if ($this->stream_eof()) { |
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return false; |
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} |
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return $this->stream( |
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function ($stream) use ($length) { |
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fseek($stream, $this->offset + $this->position); |
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/** |
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* Avoid going out of file boundary |
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*/ |
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$to_read = min($length, $this->size - $this->position); |
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$this->position += $to_read; |
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return fread($stream, $to_read); |
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} |
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); |
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} |
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/** |
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* @param callable $callback |
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* |
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* @return mixed |
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*/ |
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protected function stream ($callback) { |
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$position = ftell($this->data_stream); |
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$result = $callback($this->data_stream); |
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fseek($this->data_stream, $position); |
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return $result; |
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} |
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/** |
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* @return int |
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*/ |
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function stream_tell () { |
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return $this->position; |
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} |
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/** |
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* @return bool |
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*/ |
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function stream_eof () { |
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return $this->position == $this->size; |
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} |
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/** |
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* @param int $offset |
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* @param int $whence |
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* |
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* @return bool |
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*/ |
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function stream_seek ($offset, $whence = SEEK_SET) { |
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if ($whence == SEEK_SET && $offset >= 0 && $offset < $this->size) { |
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$this->position = $offset; |
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return true; |
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} |
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$position = $this->position + $offset; |
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if ($whence == SEEK_CUR && $offset >= 0 && $position < $this->size) { |
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$this->position = $position; |
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return true; |
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} |
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$position = $this->size + $offset; |
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if ($whence == SEEK_END && $offset <= 0 && $position >= 0) { |
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$this->position = $position; |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @return array |
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*/ |
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function stream_stat () { |
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return $this->stat; |
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} |
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} |
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nazar-pc /
CleverStyle-Framework
