diff options
Diffstat (limited to 'modules/exif/lib/makers/gps.php')
| -rw-r--r-- | modules/exif/lib/makers/gps.php | 128 |
1 files changed, 48 insertions, 80 deletions
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 @@ -73,102 +73,65 @@ function lookup_GPS_tag($tag) { } //================= -// Formats a rational number -//==================================================================== -function GPSRational($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); |