<?
//================================================================================================
//================================================================================================
//================================================================================================
/*
	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_Nikon_tag($tag,$model) {
	
	if($model==0) {
		switch($tag) {
			case "0003": $tag = "Quality";break;
			case "0004": $tag = "ColorMode";break;
			case "0005": $tag = "ImageAdjustment";break;
			case "0006": $tag = "CCDSensitivity";break;	
			case "0007": $tag = "WhiteBalance";break;	
			case "0008": $tag = "Focus";break;	
			case "0009": $tag = "Unknown2";break;	
			case "000a": $tag = "DigitalZoom";break;	
			case "000b": $tag = "Converter";break;	
			
			default: $tag = "unknown:".$tag;break;
		}
	} else if($model==1) {
		switch($tag) {
			case "0002": $tag = "ISOSetting";break;
			case "0003": $tag = "ColorMode";break;
			case "0004": $tag = "Quality";break;
			case "0005": $tag = "Whitebalance";break;
			case "0006": $tag = "ImageSharpening";break;
			case "0007": $tag = "FocusMode";break;
			case "0008": $tag = "FlashSetting";break;
			case "0009": $tag = "FlashMode";break;
			case "000b": $tag = "WhiteBalanceFine";break;
			case "000f": $tag = "ISOSelection";break;
			case "0013": $tag = "ISOSelection2";break;
			case "0080": $tag = "ImageAdjustment";break;
			case "0081": $tag = "ToneCompensation";break;
			case "0082": $tag = "Adapter";break;
			case "0083": $tag = "LensType";break;
			case "0084": $tag = "LensInfo";break;
			case "0085": $tag = "ManualFocusDistance";break; 
			case "0086": $tag = "DigitalZoom";break;
			case "0087": $tag = "FlashUsed";break;
			case "0088": $tag = "AFFocusPosition";break;
			case "008d": $tag = "ColorMode";break;
			case "0090": $tag = "LightType";break;
			case "0094": $tag = "Saturation";break;
			case "0095": $tag = "NoiseReduction";break;
			case "0010": $tag = "DataDump";break;
			
			default: $tag = "unknown:".$tag;break;
		}
	} 
	
	return $tag;
}

//=================
// Formats Data for the data type
//====================================================================
function formatNikonData($type,$tag,$intel,$model,$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=="0085" && $model==1) { //ManualFocusDistance
			$data=$data." m";
		} 
		if($tag=="0086" && $model==1) { //DigitalZoom
			$data=$data."x";
		} 
		if($tag=="000a" && $model==0) { //DigitalZoom
			$data=$data."x";
		} 
	} 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=="0003" && $model==0) { //Quality
			if($data == 1) $data = "VGA Basic";
			else if($data == 2) $data = "VGA Normal";
			else if($data == 3) $data = "VGA Fine";
			else if($data == 4) $data = "SXGA Basic";
			else if($data == 5) $data = "SXGA Normal";
			else if($data == 6) $data = "SXGA Fine";
			else $data = "Unknown: ".$data;
		}
		if($tag=="0004" && $model==0) { //Color
			if($data == 1) $data = "Color";
			else if($data == 2) $data = "Monochrome";
			else $data = "Unknown: ".$data;
		}
		if($tag=="0005" && $model==0) { //Image Adjustment
			if($data == 0) $data = "Normal";
			else if($data == 1) $data = "Bright+";
			else if($data == 2) $data = "Bright-";
			else if($data == 3) $data = "Contrast+";
			else if($data == 4) $data = "Contrast-";
			else $data = "Unknown: ".$data;
		}
		if($tag=="0006" && $model==0) { //CCD Sensitivity
			if($data == 0) $data = "ISO-80";
			else if($data == 2) $data = "ISO-160";
			else if($data == 4) $data = "ISO-320";
			else if($data == 5) $data = "ISO-100";
			else $data = "Unknown: ".$data;
		}
		if($tag=="0007" && $model==0) { //White Balance
			if($data == 0) $data = "Auto";
			else if($data == 1) $data = "Preset";
			else if($data == 2) $data = "Daylight";
			else if($data == 3) $data = "Incandescense";
			else if($data == 4) $data = "Flourescence";
			else if($data == 5) $data = "Cloudy";
			else if($data == 6) $data = "SpeedLight";
			else $data = "Unknown: ".$data;
		}
		if($tag=="000b" && $model==0) { //Converter
			if($data == 0) $data = "None";
			else if($data == 1) $data = "Fisheye";
			else $data = "Unknown: ".$data;
		}
	} else if($type=="UNDEFINED") {
		
		if($tag=="0001" && $model==1) { //Unknown (Version?)
			$data=$data/100;
		}
		if($tag=="0088" && $model==1) { //AF Focus Position
			$temp = "Center";
			$data = bin2hex($data);
			$data = str_replace("01","Top",$data);
			$data = str_replace("02","Bottom",$data);
			$data = str_replace("03","Left",$data);
			$data = str_replace("04","Right",$data);
			$data = str_replace("00","",$data);
			if(strlen($data)==0) $data = $temp;
		}
		
	} else {
		$data = bin2hex($data);
		if($intel==1) $data = intel2Moto($data);
		
		if($tag=="0083" && $model==1) { //Lens Type
		    $data = hexdec(substr($data,0,2));
			if($data == 0) $data = "AF non D";
			else if($data == 1) $data = "Manual";
			else if($data == 2) $data = "AF-D or AF-S";
			else if($data == 6) $data = "AF-D G";
			else if($data == 10) $data = "AF-D VR";
			else $data = "Unknown: ".$data;
		}
		if($tag=="0087" && $model==1) { //Flash type
		    $data = hexdec(substr($data,0,2));
			if($data == 0) $data = "Did Not Fire";
			else if($data == 4) $data = "Unknown";
			else if($data == 7) $data = "External";
			else if($data == 9) $data = "On Camera";
			else $data = "Unknown: ".$data;
		}
	}
	
	return $data;
}


//=================
// Nikon Special data section
//====================================================================
function parseNikon($block,&$result) {	
	
	if($result['Endien']=="Intel") $intel=1;
	else $intel=0;
	
	$model = $result['IFD0']['Model'];

	//these 6 models start with "Nikon".  Other models dont.
	if($model=="E700\0" || $model=="E800\0" || $model=="E900\0" || $model=="E900S\0" || $model=="E910\0" || $model=="E950\0") {
		$place=8; //current place
		$model = 0;
		
		//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);
			$tag_name = lookup_Nikon_tag($tag, $model);
			
			//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 tag is 0002 then its the ASCII value which we know is at 140 so calc offset
			//THIS HACK ONLY WORKS WITH EARLY NIKON MODELS
			if($tag=="0002") $offset = hexdec($value)-140;
			if($bytesofdata<=4) {
				$data = $value;
			} else {
				$value = bin2hex($value);
				if($intel==1) $value = intel2Moto($value);
				$data = substr($block,hexdec($value)-$offset,$bytesofdata*2);
			}
			$formated_data = formatNikonData($type,$tag,$intel,$model,$data);
		
			if($result['VerboseOutput']==1) {
				$result['SubIFD']['MakerNote'][$tag_name] = $formated_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;
			}
		}
	
	} else {
		$place=0;//current place
		$model = 1;
		
		$nikon = substr($block,$place,8);$place+=8;
		$endien = substr($block,$place,4);$place+=4;
		
		//2 bytes of 0x002a
		$tag = bin2hex(substr($block,$place,2));$place+=2;
		
		//Then 4 bytes of offset to IFD0 (usually 8 which includes all 8 bytes of TIFF header)
		$offset = bin2hex(substr($block,$place,4));$place+=4;
		if($intel==1) $offset = intel2Moto($offset);
		if(hexdec($offset)>8) $place+=$offset-8;
		
		//Get number of tags (2 bytes)
		$num = bin2hex(substr($block,$place,2));$place+=2;
		if($intel==1) $num = intel2Moto($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);
			$tag_name = lookup_Nikon_tag($tag, $model);
			
			//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);
				$data = substr($block,hexdec($value)+hexdec($offset)+2,$bytesofdata);
			}
			$formated_data = formatNikonData($type,$tag,$intel,$model,$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;
			}
		}
		
	}
}


?>