File Content: PelEntryVersion.php <?php /** * PEL: PHP Exif Library. * A library with support for reading and * writing all Exif headers in JPEG and TIFF images using PHP. * * Copyright (C) 2004, 2005 Martin Geisler. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program in the file COPYING; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301 USA */ /** * Class to hold version information. * * There are three Exif entries that hold version information: the * {@link PelTag::EXIF_VERSION}, {@link * PelTag::FLASH_PIX_VERSION}, and {@link * PelTag::INTEROPERABILITY_VERSION} tags. This class manages * those tags. * * The class is used in a very straight-forward way: * <code> * $entry = new PelEntryVersion(PelTag::EXIF_VERSION, 2.2); * </code> * This creates an entry for an file complying to the Exif 2.2 * standard. It is easy to test for standards level of an unknown * entry: * <code> * if ($entry->getTag() == PelTag::EXIF_VERSION && * $entry->getValue() > 2.0) { * echo 'Recent Exif version.'; * } * </code> * * @author Martin Geisler <mgeisler@users.sourceforge.net> * @package PEL */ namespace lsolesen\pel; class PelEntryVersion extends PelEntry { /** * The version held by this entry. * * @var float */ private $version; /** * Make a new entry for holding a version. * * @param integer $tag * This should be one of {@link * PelTag::EXIF_VERSION}, {@link PelTag::FLASH_PIX_VERSION}, * or {@link PelTag::INTEROPERABILITY_VERSION}. * @param float $version * The size of the entries leave room for * exactly four digits: two digits on either side of the decimal * point. */ public function __construct($tag, $version = 0.0) { $this->tag = $tag; $this->format = PelFormat::UNDEFINED; $this->setValue($version); } /** * Set the version held by this entry. * * @param float $version * The size of the entries leave room for * exactly four digits: two digits on either side of the decimal * point. */ public function setValue($version = 0.0) { $this->version = $version; $major = floor($version); $minor = ($version - $major) * 100; $strValue = sprintf('%02.0f%02.0f', $major, $minor); $this->components = strlen($strValue); $this->bytes = $strValue; } /** * Return the version held by this entry. * * @return float This will be the same as the value * given to {@link setValue} or {@link __construct the * constructor}. */ public function getValue() { return $this->version; } /** * Return a text string with the version. * * @param boolean $brief * controls if the output should be brief. Brief * output omits the word 'Version' so the result is just 'Exif x.y' * instead of 'Exif Version x.y' if the entry holds information * about the Exif version --- the output for FlashPix is similar. * @return string the version number with the type of the tag, * either 'Exif' or 'FlashPix'. */ public function getText($brief = false) { $v = $this->version; /* * Versions numbers like 2.0 would be output as just 2 if we don't * add the '.0' ourselves. */ if (floor($this->version) == $this->version) { $v .= '.0'; } switch ($this->tag) { case PelTag::EXIF_VERSION: if ($brief) { return Pel::fmt('Exif %s', $v); } else { return Pel::fmt('Exif Version %s', $v); } case PelTag::FLASH_PIX_VERSION: if ($brief) { return Pel::fmt('FlashPix %s', $v); } else { return Pel::fmt('FlashPix Version %s', $v); } case PelTag::INTEROPERABILITY_VERSION: if ($brief) { return Pel::fmt('Interoperability %s', $v); } else { return Pel::fmt('Interoperability Version %s', $v); } } if ($brief) { return $v; } else { return Pel::fmt('Version %s', $v); } } } Submit