<?php
/*************************
  Coppermine Photo Gallery
  ************************
  Copyright (c) 2003-2007 Coppermine Dev Team
  v1.1 originally written by Gregory DEMAR

  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.
  ********************************************
  Coppermine version: 1.4.12
  $Source$
  $Revision: 3636 $
  $Author: gaugau $
  $Date: 2007-06-29 11:35:30 +0200 (Fr, 29 Jun 2007) $
**********************************************/

/*

        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 for the MakerNote (Depends on Manufacturer)

//====================================================================

function lookup_Olympus_tag($tag) {



        switch($tag) {

                case "0200": $tag = "SpecialMode";break;

                case "0201": $tag = "JpegQual";break;

                case "0202": $tag = "Macro";break;

                case "0203": $tag = "Unknown1";break;

                case "0204": $tag = "DigiZoom";break;

                case "0205": $tag = "Unknown2";break;

                case "0206": $tag = "Unknown3";break;

                case "0207": $tag = "SoftwareRelease";break;

                case "0208": $tag = "PictInfo";break;

                case "0209": $tag = "CameraID";break;

                case "0f00": $tag = "DataDump";break;



                default: $tag = "unknown:".$tag;break;

        }



        return $tag;

}



//=================

// Formats Data for the data type

//====================================================================

function formatOlympusData($type,$tag,$intel,$data) {



        if($type=="ASCII") {





        } else if($type=="URATIONAL" || $type=="SRATIONAL") {

                $data = bin2hex($data);

                if($intel==1) $data = intel2Moto($data);

                $top = hexdec(substr($data,8,8));

                $bottom = hexdec(substr($data,0,8));

                if($bottom!=0) $data=$top/$bottom;

                else if($top==0) $data = 0;

                else $data=$top."/".$bottom;



                if($tag=="0204") { //DigitalZoom

                        $data=$data."x";

                }

                if($tag=="0205") { //Unknown2

                        $data=$top."/".$bottom;

                }

        } 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);



                if($tag=="0201") { //JPEGQuality

                        if($data == 1) $data = "SQ";

                        else if($data == 2) $data = "HQ";

                        else if($data == 3) $data = "SHQ";

                        else $data = "Unknown: ".$data;

                }

                if($tag=="0202") { //Macro

                        if($data == 0) $data = "Normal";

                        else if($data == 1) $data = "Macro";

                        else $data = "Unknown: ".$data;

                }

        } else if($type=="UNDEFINED") {







        } else {

                $data = bin2hex($data);

                if($intel==1) $data = intel2Moto($data);

        }



        return $data;

}







//=================

// Olympus Special data section

//====================================================================

function parseOlympus($block,&$result,$seek, $globalOffset) {



        if($result['Endien']=="Intel") $intel=1;

        else $intel=0;



        $model = $result['IFD0']['Model'];



        $place=8; //current place

        $offset=8;



                //Get number of tags (2 bytes)

        $num = bin2hex(substr($block,$place,2));$place+=2;

        if($intel==1) $num = intel2Moto($num);

        $result['SubIFD']['MakerNote']['MakerNoteNumTags'] = hexdec($num);



        //loop thru all tags  Each field is 12 bytes

        for($i=0;$i<hexdec($num);$i++) {



                        //2 byte tag

                $tag = bin2hex(substr($block,$place,2));$place+=2;

                if($intel==1) $tag = intel2Moto($tag);

                $tag_name = lookup_Olympus_tag($tag);



                        //2 byte type

                $type = bin2hex(substr($block,$place,2));$place+=2;

                if($intel==1) $type = intel2Moto($type);

                lookup_type($type,$size);



                        //4 byte count of number of data units

                $count = bin2hex(substr($block,$place,4));$place+=4;

                if($intel==1) $count = intel2Moto($count);

                $bytesofdata = $size*hexdec($count);



                        //4 byte value of data or pointer to data

                $value = substr($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']++;

                        }

                }

                $formated_data = formatOlympusData($type,$tag,$intel,$data);



                if($result['VerboseOutput']==1) {

                        $result['SubIFD']['MakerNote'][$tag_name] = $formated_data;

                        if($type=="URATIONAL" || $type=="SRATIONAL" || $type=="USHORT" || $type=="SSHORT" || $type=="ULONG" || $type=="SLONG" || $type=="FLOAT" || $type=="DOUBLE") {

                                $data = bin2hex($data);

                                if($intel==1) $data = intel2Moto($data);

                        }

                        $result['SubIFD']['MakerNote'][$tag_name."_Verbose"]['RawData'] = $data;

                        $result['SubIFD']['MakerNote'][$tag_name."_Verbose"]['Type'] = $type;

                        $result['SubIFD']['MakerNote'][$tag_name."_Verbose"]['Bytes'] = $bytesofdata;

                } else {

                        $result['SubIFD']['MakerNote'][$tag_name] = $formated_data;

                }

        }

}





?>