From 0c1fb039145c824147fbd587edc9332d82c1ac4b Mon Sep 17 00:00:00 2001
From: Bharat Mediratta <bharat@menalto.com>
Date: Sun, 6 Jun 2010 21:01:36 -0700
Subject: Updated to Exifer

---
 modules/exif/lib/makers/gps.php | 128 +++++++++++++++-------------------------
 1 file changed, 48 insertions(+), 80 deletions(-)

(limited to 'modules/exif/lib/makers/gps.php')

diff --git a/modules/exif/lib/makers/gps.php b/modules/exif/lib/makers/gps.php
index 9a6ab137..462aae68 100644
--- a/modules/exif/lib/makers/gps.php
+++ b/modules/exif/lib/makers/gps.php
@@ -72,103 +72,66 @@ function lookup_GPS_tag($tag) {
 	return $tag;
 }
 
-//=================
-// Formats a rational number
-//====================================================================
-function GPSRational($data, $intel) {
-
-	if($intel==1) $top = hexdec(substr($data,8,8)); 	//intel stores them bottom-top
-	else  $top = hexdec(substr($data,0,8));				//motorola stores them top-bottom
-	
-	if($intel==1) $bottom = hexdec(substr($data,0,8));	//intel stores them bottom-top
-	else  $bottom = hexdec(substr($data,8,8));			//motorola stores them top-bottom
-	
-	if($bottom!=0) $data=$top/$bottom;
-	else if($top==0) $data = 0;
-	else $data=$top."/".$bottom;
-	
-	return $data;
-}
 //=================
 // Formats Data for the data type
 //====================================================================
 function formatGPSData($type,$tag,$intel,$data) {
 
 	if($type=="ASCII") {
-						if($tag=="0001" || $tag=="0003"){ // Latitude Reference, Longitude Reference
-								$data = ($data{1} == $data{2} && $data{1} == $data{3}) ? $data{0} : $data;
-						}
-		
+		if($tag=="0001" || $tag=="0003"){ // Latitude Reference, Longitude Reference
+			$data = ($data{1} == $data{2} && $data{1} == $data{3}) ? $data{0} : $data;
+		}
+
 	} else if($type=="URATIONAL" || $type=="SRATIONAL") {
-		$data = bin2hex($data);
-		if($intel==1) $data = intel2Moto($data);
-		
-		if($intel==1) $top = hexdec(substr($data,8,8)); 	//intel stores them bottom-top
-		else  $top = hexdec(substr($data,0,8));				//motorola stores them top-bottom
-		
-		if($intel==1) $bottom = hexdec(substr($data,0,8));	//intel stores them bottom-top
-		else  $bottom = hexdec(substr($data,8,8));			//motorola stores them top-bottom
-		
-		if($type=="SRATIONAL" && $top>2147483647) $top = $top - 4294967296;		//this makes the number signed instead of unsigned
-		
-								if($tag=="0002" || $tag=="0004") { //Latitude, Longitude
-		
-			if($intel==1){ 
-				$seconds = GPSRational(substr($data,0,16),$intel); 
-				$hour = GPSRational(substr($data,32,16),$intel); 
-			} else { 
-				$hour= GPSRational(substr($data,0,16),$intel); 
-				$seconds = GPSRational(substr($data,32,16),$intel); 
+		if($tag=="0002" || $tag=="0004" || $tag=='0007') { //Latitude, Longitude, Time
+			$datum = array();
+			for ($i=0;$i<strlen($data);$i=$i+8) {
+				array_push($datum,substr($data, $i, 8));
+			}
+			$hour = unRational($datum[0],$type,$intel);
+			$minutes = unRational($datum[1],$type,$intel);
+			$seconds = unRational($datum[2],$type,$intel);
+			if($tag=="0007") { //Time
+				$data = $hour.":".$minutes.":".$seconds;
+			} else {
+				$data = $hour+$minutes/60+$seconds/3600;
 			}
-			$minutes = GPSRational(substr($data,16,16),$intel);
-			
-			$data = $hour+$minutes/60+$seconds/3600;
-		} else if($tag=="0007") { //Time
-			$seconds = GPSRational(substr($data,0,16),$intel);
-			$minutes = GPSRational(substr($data,16,16),$intel);
-			$hour = GPSRational(substr($data,32,16),$intel);
-			
-			$data = $hour.":".$minutes.":".$seconds;
 		} else {
-			if($bottom!=0) $data=$top/$bottom;
-			else if($top==0) $data = 0;
-			else $data=$top."/".$bottom;
-
-												if($tag=="0006"){
-														$data .= 'm';
-												}
+			$data = unRational($data,$type,$intel);
+			
+			if($tag=="0006"){
+				$data .= 'm';
+			}
 		}
 	} else if($type=="USHORT" || $type=="SSHORT" || $type=="ULONG" || $type=="SLONG" || $type=="FLOAT" || $type=="DOUBLE") {
-		$data = bin2hex($data);
-		if($intel==1) $data = intel2Moto($data);
-		$data=hexdec($data);
-		
-		
+		$data = rational($data,$type,$intel);
+
+
 	} else if($type=="UNDEFINED") {
-		
-		
-		
+
+
+
 	} else if($type=="UBYTE") {
 		$data = bin2hex($data);
 		if($intel==1) $num = intel2Moto($data);
 
 			
 		if($tag=="0000") { // VersionID
-										$data =  hexdec(substr($data,0,2)) .
+			$data =  hexdec(substr($data,0,2)) .
 												".". hexdec(substr($data,2,2)) .
 												".". hexdec(substr($data,4,2)) .
 												".". hexdec(substr($data,6,2));
 
-								} else if($tag=="0005"){ // Altitude Reference
-										if($data == "00000000"){ $data = 'Above Sea Level'; }
-										else if($data == "01000000"){ $data = 'Below Sea Level'; }
-								} 
-		
+		} else if($tag=="0005"){ // Altitude Reference
+			if($data == "00000000"){ $data = '+'; }
+			else if($data == "01000000"){ $data = '-'; }
+		}
+
 	} else {
 		$data = bin2hex($data);
 		if($intel==1) $data = intel2Moto($data);
 	}
-	
+
 	return $data;
 }
 
@@ -220,21 +183,26 @@ function parseGPS($block,&$result,$offset,$seek, $globalOffset) {
 		
 		//4 byte value or pointer to value if larger than 4 bytes
 		$value = substr($block,$place,4);$place+=4;
-		
 		if($bytesofdata<=4) {
 			$data = $value;
 		} else {
-			$value = bin2hex($value);
-			if($intel==1) $value = intel2Moto($value);
-			
-			$v = fseek($seek,$globalOffset+hexdec($value));  //offsets are from TIFF header which is 12 bytes from the start of the file
-			if($v==0) {
-				$data = fread($seek, $bytesofdata);
-			} else if($v==-1) {
+			if (strpos('unknown',$tag_name) !== false || $bytesofdata > 1024) {
 				$result['Errors'] = $result['Errors']++;
+				$data = '';
+				$type = 'ASCII';
+			} else {
+				$value = bin2hex($value);
+				if($intel==1) $value = intel2Moto($value);
+				$v = fseek($seek,$globalOffset+hexdec($value));  //offsets are from TIFF header which is 12 bytes from the start of the file
+				if($v==0) {
+					$data = fread($seek, $bytesofdata);
+				} else {
+					$result['Errors'] = $result['Errors']++;
+					$data = '';
+					$type = 'ASCII';
+				}
 			}
 		}
-			
 		if($result['VerboseOutput']==1) {
 			$result['GPS'][$tag_name] = formatGPSData($type,$tag,$intel,$data);
 			$result['GPS'][$tag_name."_Verbose"]['RawData'] = bin2hex($data);
-- 
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