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+<?php //================================================================================================
+//================================================================================================
+//================================================================================================
+/*
+ Exifer
+ Extracts EXIF information from digital photos.
+
+ Copyright © 2003 Jake Olefsky
+ http://www.offsky.com/software/exif/index.php
+ jake@olefsky.com
+
+ Please see exif.php for the complete information about this software.
+
+ ------------
+
+ 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; either version 2
+ of the License, or (at your option) any later version.
+
+ 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. http://www.gnu.org/copyleft/gpl.html
+*/
+//================================================================================================
+//================================================================================================
+//================================================================================================
+
+
+
+//=================
+// Looks up the name of the tag
+//====================================================================
+function lookup_GPS_tag($tag) {
+
+ switch($tag) {
+ case "0000": $tag = "Version";break;
+ case "0001": $tag = "Latitude Reference";break; //north or south
+ case "0002": $tag = "Latitude";break; //dd mm.mm or dd mm ss
+ case "0003": $tag = "Longitude Reference";break; //east or west
+ case "0004": $tag = "Longitude";break; //dd mm.mm or dd mm ss
+ case "0005": $tag = "Altitude Reference";break; //sea level or below sea level
+ case "0006": $tag = "Altitude";break; //positive rational number
+ case "0007": $tag = "Time";break; //three positive rational numbers
+ case "0008": $tag = "Satellite";break; //text string up to 999 bytes long
+ case "0009": $tag = "ReceiveStatus";break; //in progress or interop
+ case "000a": $tag = "MeasurementMode";break; //2D or 3D
+ case "000b": $tag = "MeasurementPrecision";break; //positive rational number
+ case "000c": $tag = "SpeedUnit";break; //KPH, MPH, knots
+ case "000d": $tag = "ReceiverSpeed";break; //positive rational number
+ case "000e": $tag = "MovementDirectionRef";break; //true or magnetic north
+ case "000f": $tag = "MovementDirection";break; //positive rational number
+ case "0010": $tag = "ImageDirectionRef";break; //true or magnetic north
+ case "0011": $tag = "ImageDirection";break; //positive rational number
+ case "0012": $tag = "GeodeticSurveyData";break; //text string up to 999 bytes long
+ case "0013": $tag = "DestLatitudeRef";break; //north or south
+ case "0014": $tag = "DestinationLatitude";break; //three positive rational numbers
+ case "0015": $tag = "DestLongitudeRef";break; //east or west
+ case "0016": $tag = "DestinationLongitude";break; //three positive rational numbers
+ case "0017": $tag = "DestBearingRef";break; //true or magnetic north
+ case "0018": $tag = "DestinationBearing";break; //positive rational number
+ case "0019": $tag = "DestDistanceRef";break; //km, miles, knots
+ case "001a": $tag = "DestinationDistance";break; //positive rational number
+ case "001b": $tag = "ProcessingMethod";break;
+ case "001c": $tag = "AreaInformation";break;
+ case "001d": $tag = "Datestamp";break; //text string 10 bytes long
+ case "001e": $tag = "DifferentialCorrection";break; //integer in range 0-65535
+
+
+ default: $tag = "unknown:".$tag;break;
+ }
+
+ 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} : $data;
+ }
+
+ } else if($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);
+ }
+ $minutes = GPSRational(substr($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"){
+ $data .= 'm';
+ }
+ }
+ } else if($type=="USHORT" || $type=="SSHORT" || $type=="ULONG" || $type=="SLONG" || $type=="FLOAT" || $type=="DOUBLE") {
+ $data = bin2hex($data);
+ if($intel==1) $data = intel2Moto($data);
+ $data=hexdec($data);
+
+
+ } 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)) .
+ ".". 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 {
+ $data = bin2hex($data);
+ if($intel==1) $data = intel2Moto($data);
+ }
+
+ return $data;
+}
+
+
+//=================
+// GPS Special data section
+// Useful websites
+// http://drewnoakes.com/code/exif/sampleOutput.html
+// http://www.geosnapper.com
+//====================================================================
+function parseGPS($block,&$result,$offset,$seek, $globalOffset) {
+
+ if($result['Endien']=="Intel") $intel=1;
+ else $intel=0;
+
+ $v = fseek($seek,$globalOffset+$offset); //offsets are from TIFF header which is 12 bytes from the start of the file
+ if($v==-1) {
+ $result['Errors'] = $result['Errors']++;
+ }
+
+ $num = bin2hex(fread( $seek, 2 ));
+ if($intel==1) $num = intel2Moto($num);
+ $num=hexdec($num);
+ $result['GPS']['NumTags'] = $num;
+
+ $block = fread( $seek, $num*12 );
+ $place = 0;
+
+ //loop thru all tags Each field is 12 bytes
+ for($i=0;$i<$num;$i++) {
+ //2 byte tag
+ $tag = bin2hex(substr($block,$place,2));$place+=2;
+ if($intel==1) $tag = intel2Moto($tag);
+ $tag_name = lookup_GPS_tag($tag);
+
+ //2 byte datatype
+ $type = bin2hex(substr($block,$place,2));$place+=2;
+ if($intel==1) $type = intel2Moto($type);
+ lookup_type($type,$size);
+
+ //4 byte number of elements
+ $count = bin2hex(substr($block,$place,4));$place+=4;
+ if($intel==1) $count = intel2Moto($count);
+ $bytesofdata = $size*hexdec($count);
+
+ //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) {
+ $result['Errors'] = $result['Errors']++;
+ }
+ }
+
+ if($result['VerboseOutput']==1) {
+ $result['GPS'][$tag_name] = formatGPSData($type,$tag,$intel,$data);
+ $result['GPS'][$tag_name."_Verbose"]['RawData'] = bin2hex($data);
+ $result['GPS'][$tag_name."_Verbose"]['Type'] = $type;
+ $result['GPS'][$tag_name."_Verbose"]['Bytes'] = $bytesofdata;
+ } else {
+ $result['GPS'][$tag_name] = formatGPSData($type,$tag,$intel,$data);
+ }
+ }
+}
+
+
+?>
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-13 19:08:55 +0000