nextcloud / server

	 * @return bool|resource an image resource identifier on success, <b>FALSE</b> on errors.

	 */

	private function imagecreatefrombmp($fileName) {

		if (!($fh = fopen($fileName, 'rb'))) {

			$this->logger->warning('imagecreatefrombmp: Can not open ' . $fileName, array('app' => 'core'));

			return false;

		}

		// read file header

		$meta = unpack('vtype/Vfilesize/Vreserved/Voffset', fread($fh, 14));

		// check for bitmap

		// read file header

		$meta = unpack('vtype/Vfilesize/Vreserved/Voffset', fread($fh, 14));

		// check for bitmap

		if ($meta['type'] != 19778) {

			fclose($fh);

			$this->logger->warning('imagecreatefrombmp: Can not open ' . $fileName . ' is not a bitmap!', array('app' => 'core'));

			return false;

		}

		// read image header

		$meta += unpack('Vheadersize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vcolors/Vimportant', fread($fh, 40));

		// read additional 16bit header

			// in rare cases filesize is equal to offset so we need to read physical size

			if ($meta['imagesize'] < 1) {

				$meta['imagesize'] = @filesize($fileName) - $meta['offset'];

				if ($meta['imagesize'] < 1) {

					fclose($fh);

					$this->logger->warning('imagecreatefrombmp: Can not obtain file size of ' . $fileName . ' is not a bitmap!', array('app' => 'core'));

					return false;

				}

			}

		}

		// calculate colors