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<?php
// +-----------------------------------------------------------------------+
// | Piwigo - a PHP based photo gallery |
// +-----------------------------------------------------------------------+
// | Copyright(C) 2008-2016 Piwigo Team http://piwigo.org |
// | Copyright(C) 2003-2008 PhpWebGallery Team http://phpwebgallery.net |
// | Copyright(C) 2002-2003 Pierrick LE GALL http://le-gall.net/pierrick |
// +-----------------------------------------------------------------------+
// | 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 |
// | |
// | 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; if not, write to the Free Software |
// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
// | USA. |
// +-----------------------------------------------------------------------+
/**
* @package functions\metadata
*/
/**
* returns informations from IPTC metadata, mapping is done in this function.
*
* @param string $filename
* @param array $map
* @return array
*/
function get_iptc_data($filename, $map, $array_sep=',')
{
global $conf;
$result = array();
$imginfo = array();
if (false == @getimagesize($filename, $imginfo) )
{
return $result;
}
if (isset($imginfo['APP13']))
{
$iptc = iptcparse($imginfo['APP13']);
if (is_array($iptc))
{
$rmap = array_flip($map);
foreach (array_keys($rmap) as $iptc_key)
{
if (isset($iptc[$iptc_key][0]))
{
if ($iptc_key == '2#025')
{
$value = implode($array_sep,
array_map('clean_iptc_value',$iptc[$iptc_key]));
}
else
{
$value = clean_iptc_value($iptc[$iptc_key][0]);
}
foreach (array_keys($map, $iptc_key) as $pwg_key)
{
$result[$pwg_key] = $value;
if (!$conf['allow_html_in_metadata'])
{
// in case the origin of the photo is unsecure (user upload), we
// remove HTML tags to avoid XSS (malicious execution of
// javascript)
$result[$pwg_key] = strip_tags($result[$pwg_key]);
}
}
}
}
}
}
return $result;
}
/**
* return a cleaned IPTC value.
*
* @param string $value
* @return string
*/
function clean_iptc_value($value)
{
// strip leading zeros (weird Kodak Scanner software)
while ( isset($value[0]) and $value[0] == chr(0))
{
$value = substr($value, 1);
}
// remove binary nulls
$value = str_replace(chr(0x00), ' ', $value);
if ( preg_match('/[\x80-\xff]/', $value) )
{
// apparently mac uses some MacRoman crap encoding. I don't know
// how to detect it so a plugin should do the trick.
$value = trigger_change('clean_iptc_value', $value);
if ( ($qual = qualify_utf8($value)) != 0)
{// has non ascii chars
if ($qual>0)
{
$input_encoding = 'utf-8';
}
else
{
$input_encoding = 'iso-8859-1';
if (function_exists('iconv') or function_exists('mb_convert_encoding'))
{
// using windows-1252 because it supports additional characters
// such as "oe" in a single character (ligature). About the
// difference between Windows-1252 and ISO-8859-1: the characters
// 0x80-0x9F will not convert correctly. But these are control
// characters which are almost never used.
$input_encoding = 'windows-1252';
}
}
$value = convert_charset($value, $input_encoding, get_pwg_charset());
}
}
return $value;
}
/**
* returns informations from EXIF metadata, mapping is done in this function.
*
* @param string $filename
* @param array $map
* @return array
*/
function get_exif_data($filename, $map)
{
global $conf;
$result = array();
if (!function_exists('read_exif_data'))
{
die('Exif extension not available, admin should disable exif use');
}
// Read EXIF data
if ($exif = @read_exif_data($filename) or $exif2 = trigger_change('format_exif_data', $exif=null, $filename, $map))
{
if (!empty($exif2))
{
$exif = $exif2;
}
else
{
$exif = trigger_change('format_exif_data', $exif, $filename, $map);
}
// configured fields
foreach ($map as $key => $field)
{
if (strpos($field, ';') === false)
{
if (isset($exif[$field]))
{
$result[$key] = $exif[$field];
}
}
else
{
$tokens = explode(';', $field);
if (isset($exif[$tokens[0]][$tokens[1]]))
{
$result[$key] = $exif[$tokens[0]][$tokens[1]];
}
}
}
// GPS data
$gps_exif = array_intersect_key($exif, array_flip(array('GPSLatitudeRef', 'GPSLatitude', 'GPSLongitudeRef', 'GPSLongitude')));
if (count($gps_exif) == 4)
{
if (
is_array($gps_exif['GPSLatitude']) and in_array($gps_exif['GPSLatitudeRef'], array('S', 'N')) and
is_array($gps_exif['GPSLongitude']) and in_array($gps_exif['GPSLongitudeRef'], array('W', 'E'))
)
{
$result['latitude'] = parse_exif_gps_data($gps_exif['GPSLatitude'], $gps_exif['GPSLatitudeRef']);
$result['longitude'] = parse_exif_gps_data($gps_exif['GPSLongitude'], $gps_exif['GPSLongitudeRef']);
}
}
}
if (!$conf['allow_html_in_metadata'])
{
foreach ($result as $key => $value)
{
// in case the origin of the photo is unsecure (user upload), we remove
// HTML tags to avoid XSS (malicious execution of javascript)
$result[$key] = strip_tags($value);
}
}
return $result;
}
/**
* Converts EXIF GPS format to a float value.
* @since 2.6
*
* @param string[] $raw eg:
* - 41/1
* - 54/1
* - 9843/500
* @param string $ref 'S', 'N', 'E', 'W'. eg: 'N'
* @return float eg: 41.905468
*/
function parse_exif_gps_data($raw, $ref)
{
foreach ($raw as &$i)
{
$i = explode('/', $i);
$i = $i[1]==0 ? 0 : $i[0]/$i[1];
}
unset($i);
$v = $raw[0] + $raw[1]/60 + $raw[2]/3600;
$ref = strtoupper($ref);
if ($ref == 'S' or $ref == 'W') $v= -$v;
return $v;
}
?>
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