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<?php |
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/** |
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* fast-image-size stream reader |
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* @package fast-image-size |
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* @copyright (c) Marc Alexander <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace FastImageSize; |
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use FastImageSize\Type\TypeJpegHelper; |
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class StreamReader |
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{ |
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/** @var bool Flag whether allow_url_fopen is enabled */ |
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protected $isFopenEnabled = false; |
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/** @var string Data retrieved from remote */ |
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public $data = ''; |
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/** |
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* Constructor for fastImageSize class |
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*/ |
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public function __construct() |
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{ |
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$iniGet = new \bantu\IniGetWrapper\IniGetWrapper(); |
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$this->isFopenEnabled = $iniGet->getBool('allow_url_fopen'); |
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} |
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/** |
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* Reset stream reader data |
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*/ |
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public function resetData() |
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{ |
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$this->data = ''; |
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} |
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/** |
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* Get force length data |
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* |
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* @param int $offset |
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* @param int $length |
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* @return bool|string Returned data if long enough, false if not |
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*/ |
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protected function getForcedLengthData($offset, $length) |
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{ |
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return (strlen($this->data) < ($length + $offset)) ? false : substr($this->data, $offset, $length); |
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} |
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/** |
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* Get image from specified path/source |
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* |
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* @param string $filename Path to image |
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* @param int $offset Offset at which reading of the image should start |
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* @param int $length Maximum length that should be read |
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* @param bool $forceLength True if the length needs to be the specified |
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* length, false if not. Default: true |
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* |
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* @return false|string Image data or false if result was empty |
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*/ |
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public function getImage($filename, $offset, $length, $forceLength = true) |
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{ |
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if (empty($this->data)) |
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{ |
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$this->getImageData($filename, $offset, $length); |
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} |
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// Force length to expected one. Return false if data length |
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// is smaller than expected length |
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if ($forceLength === true) |
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{ |
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return $this->getForcedLengthData($offset, $length); |
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} |
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return empty($this->data) ? false : $this->data; |
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} |
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/** |
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* Get image data for specified filename with offset and length |
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* |
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* @param string $filename Path to image |
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* @param int $offset Offset at which reading of the image should start |
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* @param int $length Maximum length that should be read |
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*/ |
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protected function getImageData($filename, $offset, $length) |
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{ |
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// Check if we don't have a valid scheme according to RFC 3986 and |
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// try to use file_get_contents in that case |
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if (preg_match('#^([a-z][a-z0-9+\-.]+://)#i', $filename)) |
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{ |
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try |
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{ |
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$body = $this->getSeekableImageData($filename, $offset); |
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while ($body !== null && !$body->eof()) |
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{ |
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if (!$this->readDataFromBody($body, $length)) |
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{ |
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break; |
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} |
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} |
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} |
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catch (\GuzzleHttp\Exception\RequestException $exception) |
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{ |
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// Silently fail in case of issues during guzzle request |
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} |
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} |
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$this->getImageDataFopen($filename, $offset, $length); |
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} |
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/** |
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* Read data from guzzle request body |
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* |
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* @param \GuzzleHttp\Stream\StreamInterface $body Request body as stream |
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* @param int $length Requested length for file |
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* @return bool True while reading and not having reached the end of the |
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* targeted length, false if end of targeted length has been reached |
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*/ |
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protected function readDataFromBody(\GuzzleHttp\Stream\StreamInterface $body, $length) |
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{ |
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$readLength = min($length - strlen($this->data), TypeJpegHelper::JPEG_CHUNK_SIZE); |
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$this->data .= $body->read($readLength); |
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if ($readLength < TypeJpegHelper::JPEG_CHUNK_SIZE || strlen($this->data == $readLength)) |
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{ |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Get image data using file get contents if data is empty and |
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* allow_url_fopen is enabled |
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* |
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* @param string $filename Path to image |
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* @param int $offset Offset at which reading of the image should start |
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* @param int $length Maximum length that should be read |
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*/ |
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protected function getImageDataFopen($filename, $offset, $length) |
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{ |
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if ($this->isFopenEnabled && empty($this->data)) |
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{ |
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$this->data = @file_get_contents($filename, null, null, $offset, $length); |
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} |
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} |
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/** |
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* Get seekable image data in form of Guzzle stream interface |
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* |
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* @param string $filename Filename / URL to get |
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* @param int $offset Offset for response body |
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* @return \GuzzleHttp\Stream\StreamInterface|null Stream interface of |
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* requested image or null if it could not be retrieved |
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*/ |
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public function getSeekableImageData($filename, $offset) |
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{ |
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$guzzleClient = new \GuzzleHttp\Client(); |
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// Set stream to true to not read full file data during request |
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$response = $guzzleClient->get($filename, ['stream' => true]); |
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$body = $response->getBody(); |
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if ($offset > 0 && !$body->eof()) |
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{ |
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$body->seek($offset); |
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} |
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return $body; |
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} |
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} |
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marc1706 /
fast-image-size
