From 4fca6a259e7e68af8e668fd0e89bfdbe0c8a1c45 Mon Sep 17 00:00:00 2001
From: mistic100 <mistic@piwigo.org>
Date: Fri, 6 Dec 2013 19:14:44 +0000
Subject: feature 3009: Add 'latitude' and 'longitude' fields in images table

git-svn-id: http://piwigo.org/svn/trunk@25801 68402e56-0260-453c-a942-63ccdbb3a9ee
---
 include/functions_metadata.inc.php | 47 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

(limited to 'include/functions_metadata.inc.php')

diff --git a/include/functions_metadata.inc.php b/include/functions_metadata.inc.php
index 255f8221d..a0ebf5c77 100644
--- a/include/functions_metadata.inc.php
+++ b/include/functions_metadata.inc.php
@@ -152,7 +152,9 @@ function get_exif_data($filename, $map)
   // Read EXIF data
   if ($exif = @read_exif_data($filename))
   {
-    $exif = trigger_event('format_exif_data', $exif, $filename, $map );
+    $exif = trigger_event('format_exif_data', $exif, $filename, $map);
+
+    // configured fields
     foreach ($map as $key => $field)
     {
       if (strpos($field, ';') === false)
@@ -171,6 +173,20 @@ function get_exif_data($filename, $map)
         }
       }
     }
+
+    // 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 (!$conf['allow_html_in_metadata'])
@@ -186,4 +202,33 @@ function get_exif_data($filename, $map)
   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;
+}
+
 ?>
\ No newline at end of file
-- 
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