--- /dev/null
+<?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
+ */
+namespace lsolesen\pel;
+
+/**
+ * Classes used to hold data for Exif tags of format undefined.
+ *
+ * This file contains the base class {@link PelEntryUndefined} and
+ * the subclasses {@link PelEntryUserComment} which should be used
+ * to manage the {@link PelTag::USER_COMMENT} tag, and {@link
+ * PelEntryVersion} which is used to manage entries with version
+ * information.
+ *
+ * @author Martin Geisler <mgeisler@users.sourceforge.net>
+ * @license http://www.gnu.org/licenses/gpl.html GNU General Public
+ * License (GPL)
+ * @package PEL
+ */
+
+/**
+ * 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
+ */
+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', $v);
+ }
+ break;
+ case PelTag::FLASH_PIX_VERSION:
+ if ($brief) {
+ return Pel::fmt('FlashPix %s', $v);
+ } else {
+ return Pel::fmt('FlashPix Version %s', $v);
+ }
+ break;
+ case PelTag::INTEROPERABILITY_VERSION:
+ if ($brief) {
+ return Pel::fmt('Interoperability %s', $v);
+ } else {
+ return Pel::fmt('Interoperability Version %s', $v);
+ }
+ break;
+ }
+
+ if ($brief) {
+ return $v;
+ } else {
+ return Pel::fmt('Version %s', $v);
+ }
+ }
+}
projects / yaffs-website / blobdiff