-<?php

-/**

- *

- * This file is part of the phpBB Forum Software package.

- *

- * @copyright (c) phpBB Limited <https://www.phpbb.com>

- * @license GNU General Public License, version 2 (GPL-2.0)

- *

- * For full copyright and license information, please see

- * the docs/CREDITS.txt file.

- *

- */

-

-namespace phpbb\upload;

-

-/**

- * This class handles the retrieval of image dimensions

- */

-class imagesize

-{

- /** @var int 4-byte long size */

- const LONG_SIZE = 4;

-

- /** @var int 2-byte short size */

- const SHORT_SIZE = 2;

-

- /** @var string PNG header */

- const PNG_HEADER = "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a";

-

- /** @var int PNG IHDR offset */

- const PNG_IHDR_OFFSET = 12;

-

- /** @var string GIF87a header */

- const GIF87A_HEADER = "\x47\x49\x46\x38\x37\x61";

-

- /** @var string GIF89a header */

- const GIF89A_HEADER = "\x47\x49\x46\x38\x39\x61";

-

- /** @var int GIF header size */

- const GIF_HEADER_SIZE = 6;

-

- /** @var int JPG max header size. Headers can be bigger, but we'll abort

- * going throught he header after this */

- const JPG_MAX_HEADER_SIZE = 24576;

-

- /** @var string PSD signature */

- const PSD_SIGNATURE = "8BPS";

-

- /** @var int PSD header size */

- const PSD_HEADER_SIZE = 22;

-

- /** @var int PSD dimensions info offset */

- const PSD_DIMENSIONS_OFFSET = 14;

-

- /** @var int BMP header size needed for retrieving dimensions */

- const BMP_HEADER_SIZE = 26;

-

- /** @var string BMP signature */

- const BMP_SIGNATURE = "\x42\x4D";

-

- /** qvar int BMP dimensions offset */

- const BMP_DIMENSIONS_OFFSET = 18;

-

- /** @var int TIF header size. The header might be larger but the dimensions

- * should be in the first 512 bytes */

- const TIF_HEADER_SIZE = 512;

-

- /** @var int TIF tag for image height */

- const TIF_TAG_IMAGE_HEIGHT = 257;

-

- /** @var int TIF tag for image width */

- const TIF_TAG_IMAGE_WIDTH = 256;

-

- /** @var int TIF tag type for short */

- const TIF_TAG_TYPE_SHORT = 3;

-

- /** @var int TIF IFD entry size */

- const TIF_IFD_ENTRY_SIZE = 12;

-

- /** @var int IFF header size. Grab more than what should be needed to make

- * sure we have the necessary data */

- const IFF_HEADER_SIZE = 32;

-

- /** @var string JPEG 2000 signature */

- const JPEG_2000_SIGNATURE = "\x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A";

-

- /** @var array Size info that is returned */

- protected $size = array();

-

- /** @var string Data retrieved from remote */

- protected $data = '';

-

- /**

- * Get image dimensions of supplied image

- *

- * @param string $file Path to image that should be checked

- * @param string $type Mimetype of image

- * @return array|bool Array with image dimensions if successful, false if not

- */

- public function get_imagesize($file, $type = '')

- {

- // Reset values

- $this->reset_values();

-

- // Treat image type as unknown if extension or mime type is unknown

- if (!preg_match('/\.([a-z0-9]+)$/i', $file, $match) && empty($type))

- {

- $this->get_imagesize_unknown_type($file);

- }

- else

- {

- $extension = (isset($match[1])) ? $match[1] : preg_replace('/.+\/([a-z0-9-.]+)$/i', '$1', $type);

-

- // Reset size info

- $this->size = array();

-

- switch ($extension)

- {

- case 'png':

- $this->get_png_size($file);

- break;

-

- case 'gif':

- $this->get_gif_size($file);

- break;

-

- case 'jpeg':

- case 'jpg':

- case 'jpe':

- case 'jif':

- case 'jfif':

- case 'jfi':

- $this->get_jpeg_size($file);

- break;

-

- case 'jp2':

- case 'j2k':

- case 'jpf':

- case 'jpg2':

- case 'jpx':

- case 'jpm':

- $this->get_jp2_size($file);

- break;

-

- case 'psd':

- case 'photoshop':

- $this->get_psd_size($file);

- break;

-

- case 'bmp':

- $this->get_bmp_size($file);

- break;

-

- case 'tif':

- case 'tiff':

- // get_tif_size() sets mime type

- $this->get_tif_size($file);

- break;

-

- case 'wbm':

- case 'wbmp':

- case 'vnd.wap.wbmp':

- $this->get_wbmp_size($file);

- break;

-

- case 'iff':

- case 'x-iff':

- $this->get_iff_size($file);

- break;

-

- default:

- return false;

- }

- }

-

- return sizeof($this->size) > 1 ? $this->size : false;

- }

-

- /**

- * Get dimensions of image if type is unknown

- *

- * @param string $filename Path to file

- */

- protected function get_imagesize_unknown_type($filename)

- {

- // Grab the maximum amount of bytes we might need

- $data = $this->get_image($filename, 0, self::JPG_MAX_HEADER_SIZE, false);

-

- if ($data !== false)

- {

- $class_methods = preg_grep('/get_([a-z0-9]+)_size/i', get_class_methods($this));

-

- foreach ($class_methods as $method)

- {

- call_user_func_array(array($this, $method), array($filename));

-

- if (sizeof($this->size) > 1)

- {

- break;

- }

- }

- }

- }

-

- /**

- * Reset values to default

- */

- protected function reset_values()

- {

- $this->size = array();

- $this->data = '';

- }

-

- /**

- * Set mime type based on supplied image

- *

- * @param int $type Type of image

- */

- protected function set_image_type($type)

- {

- $this->size['type'] = $type;

- }

-

- /**

- * Get image from specified path/source

- *

- * @param string $filename Path to image

- * @param int $offset Offset at which reading of the image should start

- * @param int $length Maximum length that should be read

- * @param bool $force_length True if the length needs to be the specified

- * length, false if not. Default: true

- *

- * @return bool|string Image data or false if result was empty

- */

- protected function get_image($filename, $offset, $length, $force_length = true)

- {

- if (empty($this->data))

- {

- $this->data = @file_get_contents($filename, null, null, $offset, $length);

- }

-

- // Force length to expected one. Return false if data length

- // is smaller than expected length

- if ($force_length === true)

- {

- return (strlen($this->data) < $length) ? false : substr($this->data, $offset, $length) ;

- }

-

- return empty($this->data) ? false : $this->data;

- }

-

- /**

- * Get dimensions of PNG image

- *

- * @param string $filename Filename of image

- *

- * @return array|bool Array with image dimensions if successful, false if not

- */

- protected function get_png_size($filename)

- {

- // Retrieve image data including the header, the IHDR tag, and the

- // following 2 chunks for the image width and height

- $data = $this->get_image($filename, 0, self::PNG_IHDR_OFFSET + 3 * self::LONG_SIZE);

-

- // Check if header fits expected format specified by RFC 2083

- if (substr($data, 0, self::PNG_IHDR_OFFSET - self::LONG_SIZE) !== self::PNG_HEADER || substr($data, self::PNG_IHDR_OFFSET, self::LONG_SIZE) !== 'IHDR')

- {

- return;

- }

-

- $this->size = unpack('Nwidth/Nheight', substr($data, self::PNG_IHDR_OFFSET + self::LONG_SIZE, self::LONG_SIZE * 2));

-

- $this->set_image_type(IMAGETYPE_PNG);

- }

-

- /**

- * Get dimensions of GIF image

- *

- * @param string $filename Filename of image

- *

- * @return array|bool Array with image dimensions if successful, false if not

- */

- protected function get_gif_size($filename)

- {

- // Get data needed for reading image dimensions as outlined by GIF87a

- // and GIF89a specifications

- $data = $this->get_image($filename, 0, self::GIF_HEADER_SIZE + self::SHORT_SIZE * 2);

-

- $type = substr($data, 0, self::GIF_HEADER_SIZE);

- if ($type !== self::GIF87A_HEADER && $type !== self::GIF89A_HEADER)

- {

- return;

- }

-

- $this->size = unpack('vwidth/vheight', substr($data, self::GIF_HEADER_SIZE, self::SHORT_SIZE * 2));

-

- $this->set_image_type(IMAGETYPE_GIF);

- }

-

- /**

- * Get dimensions of JPG image

- *

- * @param string $filename Filename of image

- *

- * @return array|bool Array with image dimensions if successful, false if not

- */

- protected function get_jpeg_size($filename)

- {

- // Do not force the data length

- $data = $this->get_image($filename, 0, self::JPG_MAX_HEADER_SIZE, false);

-

- // Check if file is jpeg

- if ($data[0] !== "\xFF" || $data[1] !== "\xD8")

- {

- return;

- }

-

- // Look through file for SOF marker

- for ($i = 2 * self::SHORT_SIZE; $i < strlen($data); $i++)

- {

- if ($data[$i] === "\xFF" && in_array($data[$i+1], array("\xC0", "\xC1", "\xC2", "\xC3", "\xC5", "\xC6", "\xC7", "\xC8", "\xC9", "\xCA", "\xCB", "\xCD", "\xCE", "\xCF")))

- {

- // Extract size info from SOF marker

- list(, $unpacked) = unpack("H*", substr($data, $i + self::SHORT_SIZE, 7));

-

- // Get width and height from unpacked size info

- $this->size = array(

- 'width' => hexdec(substr($unpacked, 10, 4)),

- 'height' => hexdec(substr($unpacked, 6, 4)),

- );

-

- break;

- }

- }

-

- $this->set_image_type(IMAGETYPE_JPEG);

- }

-

- /**

- * Get dimensions of PSD image

- *

- * @param string $filename Filename of image

- *

- * @return array|bool Array with image dimensions if successful, false if not

- */

- protected function get_psd_size($filename)

- {

- $data = $this->get_image($filename, 0, self::PSD_HEADER_SIZE);

-

- if ($data === false)

- {

- return;

- }

-

- // Offset for version info is length of header but version is only a

- // 16-bit unsigned value

- $version = unpack('n', substr($data, self::LONG_SIZE, 2));

-

- // Check if supplied file is a PSD file

- if (substr($data, 0, self::LONG_SIZE) !== self::PSD_SIGNATURE || $version[1] !== 1)

- {

- return;

- }

-

- $this->size = unpack('Nheight/Nwidth', substr($data, self::PSD_DIMENSIONS_OFFSET, 2 * self::LONG_SIZE));

-

- $this->set_image_type(IMAGETYPE_PSD);

- }

-

- /**

- * Get dimensions of BMP image

- *

- * @param string $filename Filename of image

- *

- * @return array|bool Array with image dimensions if successful, false if not

- */

- protected function get_bmp_size($filename)

- {

- $data = $this->get_image($filename, 0, self::BMP_HEADER_SIZE);

-

- // Check if supplied file is a BMP file

- if (substr($data, 0, 2) !== self::BMP_SIGNATURE)

- {

- return;

- }

-

- $this->size = unpack('lwidth/lheight', substr($data, self::BMP_DIMENSIONS_OFFSET, 2 * self::LONG_SIZE));

-

- $this->set_image_type(IMAGETYPE_BMP);

- }

-

- /**

- * Get dimensions of TIF/TIFF image

- *

- * @param string $filename Filename of image

- *

- * @return array|bool Array with image dimensions if successful, false if not

- */

- protected function get_tif_size($filename)

- {

- // Do not force length of header

- $data = $this->get_image($filename, 0, self::TIF_HEADER_SIZE, false);

-

- $signature = substr($data, 0, self::SHORT_SIZE);

-

- if ($signature !== "II" && $signature !== "MM")

- {

- return;

- }

-

- if ($signature === "II")

- {

- $type_long = 'V';

- $type_short = 'v';

- $this->set_image_type(IMAGETYPE_TIFF_II);

- }

- else

- {

- $type_long = 'N';

- $type_short = 'n';

- $this->set_image_type(IMAGETYPE_TIFF_MM);

- }

-

- // Get offset of IFD

- list(, $offset) = unpack($type_long, substr($data, self::LONG_SIZE, self::LONG_SIZE));

-

- // Get size of IFD

- list(, $size_ifd) = unpack($type_short, substr($data, $offset, self::SHORT_SIZE));

-

- // Skip 2 bytes that define the IFD size

- $offset += self::SHORT_SIZE;

-

- // Filter through IFD

- for ($i = 0; $i < $size_ifd; $i++)

- {

- // Get IFD tag

- $type = unpack($type_short, substr($data, $offset, self::SHORT_SIZE));

-

- // Get field type of tag

- $field_type = unpack($type_short . 'type', substr($data, $offset + self::SHORT_SIZE, self::SHORT_SIZE));

-

- // Get IFD entry

- $ifd_value = substr($data, $offset + 2 * self::LONG_SIZE, self::LONG_SIZE);

-

- // Get actual dimensions from IFD

- if ($type[1] === self::TIF_TAG_IMAGE_HEIGHT)

- {

- $this->size = array_merge($this->size, ($field_type['type'] === self::TIF_TAG_TYPE_SHORT) ? unpack($type_short . 'height', $ifd_value) : unpack($type_long . 'height', $ifd_value));

- }

- else if ($type[1] === self::TIF_TAG_IMAGE_WIDTH)

- {

- $this->size = array_merge($this->size, ($field_type['type'] === self::TIF_TAG_TYPE_SHORT) ? unpack($type_short .'width', $ifd_value) : unpack($type_long . 'width', $ifd_value));

- }

-

- $offset += self::TIF_IFD_ENTRY_SIZE;

- }

- }

-

- /**

- * Get dimensions of WBMP image

- *

- * @param string $filename Filename of image

- *

- * @return array|bool Array with image dimensions if successful, false if not

- */

- protected function get_wbmp_size($filename)

- {

- $data = $this->get_image($filename, 0, self::LONG_SIZE);

-

- // Check if image is WBMP

- if (ord($data[0]) !== 0 || ord($data[1]) !== 0 || $data === substr(self::JPEG_2000_SIGNATURE, 0, 4))

- {

- return;

- }

-

- $this->size = unpack('Cwidth/Cheight', substr($data, self::SHORT_SIZE, self::SHORT_SIZE));

-

- $this->set_image_type(IMAGETYPE_WBMP);

- }

-

- /**

- * Get dimensions of IFF image

- *

- * @param string $filename Filename of image

- *

- * @return array|bool Array with image dimensions if successful, false if not

- */

- protected function get_iff_size($filename)

- {

- $data = $this->get_image($filename, 0, self::IFF_HEADER_SIZE);

-

- $signature = substr($data, 0, self::LONG_SIZE );

-

- // Check if image is IFF

- if ($signature !== 'FORM' && $signature !== 'FOR4')

- {

- return;

- }

-

- // Amiga version of IFF

- if ($signature === 'FORM')

- {

- $btmhd_position = strpos($data, 'BMHD');

- $this->size = unpack('nwidth/nheight', substr($data, $btmhd_position + 2 * self::LONG_SIZE, self::LONG_SIZE));

- }

- // Maya version

- else

- {

- $btmhd_position = strpos($data, 'BHD');

- $this->size = unpack('Nwidth/Nheight', substr($data, $btmhd_position + 2 * self::LONG_SIZE - 1, self::LONG_SIZE * 2));

- }

-

- $this->set_image_type(IMAGETYPE_IFF);

- }

-

- /**

- * Get dimensions of JPEG 2000 image

- *

- * @param string $filename Filename of image

- *

- * @return array|bool Array with image dimensions if successful, false if not

- */

- protected function get_jp2_size($filename)

- {

- $data = $this->get_image($filename, 0, self::JPG_MAX_HEADER_SIZE, false);

-

- // Check if file is jpeg 2000

- if (substr($data, 0, strlen(self::JPEG_2000_SIGNATURE)) !== self::JPEG_2000_SIGNATURE)

- {

- return;

- }

-

- // Get SOC position before starting to search for SIZ

- $soc_position = strpos($data, "\xFF\x4F");

-

- // Make sure we do not get SIZ before SOC

- $data = substr($data, $soc_position);

-

- $siz_position = strpos($data, "\xFF\x51");

-

- // Remove SIZ and everything before

- $data = substr($data, $siz_position + self::SHORT_SIZE);

-

- // Acquire size info from data

- $this->size = unpack('Nwidth/Nheight', substr($data, self::LONG_SIZE, self::LONG_SIZE * 2));

-

- $this->set_image_type(IMAGETYPE_JPEG2000);

- }

-}