* @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:
*
* $entry = new PelEntryVersion(PelTag::EXIF_VERSION, 2.2);
*
* This creates an entry for an file complying to the Exif 2.2
* standard. It is easy to test for standards level of an unknown
* entry:
*
* if ($entry->getTag() == PelTag::EXIF_VERSION &&
* $entry->getValue() > 2.0) {
* echo 'Recent Exif version.';
* }
*
*
* @author Martin Geisler
* @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);
}
}
}