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<?php
/**
* Copyright 2009-2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file LICENSE for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @author Michael J. Rubinsky <mrubinsk@horde.org>
* @category Horde
* @package Image
*/
/**
* Base class for Horde_Image_Exif drivers.
*
* @author Michael J. Rubinsky <mrubinsk@horde.org>
* @category Horde
* @copyright 2009-2017 Horde LLC
* @package Image
*/
abstract class Horde_Image_Exif_Base
{
/**
* Instance parameters.
*
* @var array
*/
protected $_params;
/**
* Optional Logger
*/
protected $_logger;
/**
*
* @param array $params Parameter array:
* - logger: Horde_Log_Logger Logger instance.
*/
public function __construct($params = array())
{
if (!empty($params['logger'])) {
$this->_logger = $params['logger'];
unset($params['logger']);
}
$this->_params = $params;
}
/**
* Process the EXIF data.
*
* @param array $exif Array of EXIF data.
*
* @return array An array of processed EXIF data.
*/
protected function _processData($exif)
{
if (!$exif) {
return array();
}
$results = array();
$fields = Horde_Image_Exif::getFields($this);
foreach ($fields as $field => $data) {
$value = isset($exif[$field]) ? $exif[$field] : '';
// Don't store empty fields.
if ($value === '') {
continue;
}
/* Special handling of GPS data */
if ($data['type'] == 'gps') {
$value = $this->_parseGPSData($exif[$field]);
if (!empty($exif[$field . 'Ref']) &&
in_array($exif[$field . 'Ref'], array('S', 'South', 'W', 'West'))) {
$value = - abs($value);
}
}
/* Date fields are converted to a timestamp.*/
if ($data['type'] == 'date') {
@list($ymd, $hms) = explode(' ', $value, 2);
@list($year, $month, $day) = explode(':', $ymd, 3);
if (!empty($hms) && !empty($year) && !empty($month) && !empty($day)) {
$time = "$month/$day/$year $hms";
$value = strtotime($time);
}
}
if ($data['type'] == 'array' || is_array($value)) {
if (is_array($value)) {
$value = implode(',', $value);
}
}
$results[$field] = $value;
}
return $results;
}
/**
* Parse the Longitude and Latitude values into a standardized format
* regardless of the source format.
*
* @param mixed $data An array containing degrees, minutes, seconds
* in index 0, 1, 2 respectifully.
*
* @return double The location data in a decimal format.
*/
protected function _parseGPSData($data)
{
// According to EXIF standard, GPS data can be in the form of
// dd/1 mm/1 ss/1 or as a decimal reprentation.
if (!is_array($data)) {
// Assume a scalar is a decimal representation. Cast it to a float
// which will get rid of any stray ordinal indicators. (N, S,
// etc...)
return (double)$data;
}
if ($data[0] == 0) {
return 0;
}
if (strpos($data[0], '/') !== false) {
$degrees = explode('/', $data[0]);
if (count($degrees) > 1) {
$degrees = $degrees[0] / $degrees[1];
} else {
$degrees = $degrees[0];
}
} else {
$degrees = $data[0];
}
if (strpos($data[1], '/') !== false) {
$min = explode('/', $data[1]);
if (count($min) > 1) {
$min = $min[0] / $min[1];
} else {
$min = $min[0];
}
} else {
$min = $data[1];
}
if (strpos($data[2], '/') !== false) {
$sec = explode('/', $data[2]);
if (count($sec) > 1) {
$sec = $sec[0] / $sec[1];
} else {
$sec = $sec[0];
}
} else {
$sec = $data[2];
}
return self::_degToDecimal($degrees, $min, $sec);
}
/**
* Convert degrees representation to decimal representation.
*
* @param double $degrees The degrees latitude or longitude.
* @param double $minutes The minutes latitude or longitude.
* @param double $seconds the seconds latitude or longitude.
*
* @return double The decimal representation of the latitude or longitute.
*/
protected function _degToDecimal($degrees, $minutes, $seconds)
{
$degs = (double)($degrees + ($minutes / 60) + ($seconds / 3600));
return round($degs, 6);
}
protected function _logDebug($message)
{
if (!empty($this->_logger)) {
$this->_logger->debug($message);
}
}
protected function _logErr($message)
{
if (!empty($this->_logger)) {
$this->_logger->err($message);
}
}
abstract public function getData($image);
abstract public function supportedCategories();
}
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