1<?php
2
3/**
4 * Exifer
5 * Extracts EXIF information from digital photos.
6 *
7 * Copyright © 2003 Jake Olefsky
8 * http://www.offsky.com/software/exif/index.php
9 * jake@olefsky.com
10 *
11 * Please see exif.php for the complete information about this software.
12 *
13 * This program is free software; you can redistribute it and/or modify it under the terms of
14 * the GNU General Public License as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
18 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 * See the GNU General Public License for more details. http://www.gnu.org/copyleft/gpl.html
20 */
21
22/**
23 * Looks up the name of the tag for the MakerNote (Depends on Manufacturer)
24 *
25 * @param type $tag
26 * @return string
27 */
28function lookup_Olympus_tag($tag) {
29	switch ($tag) {
30		case "0200": $tag = "SpecialMode";
31			break;
32		case "0201": $tag = "JpegQual";
33			break;
34		case "0202": $tag = "Macro";
35			break;
36		case "0203": $tag = "Unknown1";
37			break;
38		case "0204": $tag = "DigiZoom";
39			break;
40		case "0205": $tag = "Unknown2";
41			break;
42		case "0206": $tag = "Unknown3";
43			break;
44		case "0207": $tag = "SoftwareRelease";
45			break;
46		case "0208": $tag = "PictInfo";
47			break;
48		case "0209": $tag = "CameraID";
49			break;
50		case "0f00": $tag = "DataDump";
51			break;
52		default: $tag = "unknown:" . $tag;
53			break;
54	}
55
56	return $tag;
57}
58
59/**
60 * Formats Data for the data type
61 *
62 * @param type $type
63 * @param type $tag
64 * @param type $intel
65 * @param type $data
66 * @return type
67 */
68function formatOlympusData($type, $tag, $intel, $data) {
69	if ($type == "ASCII") {
70
71	} else if ($type == "URATIONAL" || $type == "SRATIONAL") {
72		$data = unRational($data, $type, $intel);
73		if ($intel == 1) {
74			$data = intel2Moto($data);
75		}
76		if ($tag == "0204") { //DigitalZoom
77			$data = $data . "x";
78		}
79		if ($tag == "0205") { //Unknown2
80		}
81	} else if ($type == "USHORT" || $type == "SSHORT" || $type == "ULONG" || $type == "SLONG" || $type == "FLOAT" || $type == "DOUBLE") {
82		$data = rational($data, $type, $intel);
83
84		if ($tag == "0201") { //JPEGQuality
85			if ($data == 1) {
86				$data = "SQ";
87			} else if ($data == 2) {
88				$data = "HQ";
89			} else if ($data == 3) {
90				$data = "SHQ";
91			} else {
92				$data = gettext("Unknown") . ": " . $data;
93			}
94		}
95		if ($tag == "0202") { //Macro
96			if ($data == 0) {
97				$data = "Normal";
98			} else if ($data == 1) {
99				$data = "Macro";
100			} else {
101				$data = gettext("Unknown") . ": " . $data;
102			}
103		}
104	} else if ($type == "UNDEFINED") {
105
106	} else {
107		$data = bin2hex($data);
108		if ($intel == 1) {
109			$data = intel2Moto($data);
110		}
111	}
112
113	return $data;
114}
115
116/**
117 * Olympus Special data section
118  // - Updated by Zenphoto for new header tag in E-410/E-510/E-3 cameras. 2/24/2008
119 *
120 * @param type $block
121 * @param type $result
122 * @param type $seek
123 * @param type $globalOffset
124 * @return boolean
125 */
126function parseOlympus($block, &$result, $seek, $globalOffset) {
127
128	if ($result['Endien'] == "Intel") {
129		$intel = 1;
130	} else {
131		$intel = 0;
132	}
133
134	$model = $result['IFD0']['Model'];
135
136	// New header for new DSLRs - Check for it because the
137	// number of bytes that count the IFD fields differ in each case.
138	// Fixed by Zenphoto 2/24/08
139	$new = false;
140	if (substr($block, 0, 8) == "OLYMPUS\x00") {
141		$new = true;
142	} else if (substr($block, 0, 7) == "OLYMP\x00\x01" || substr($block, 0, 7) == "OLYMP\x00\x02") {
143		$new = false;
144	} else {
145		// Header does not match known Olympus headers.
146		// This is not a valid OLYMPUS Makernote.
147		return false;
148	}
149
150	// Offset of IFD entry after Olympus header.
151	$place = 8;
152	$offset = 8;
153
154	// Get number of tags (1 or 2 bytes, depending on New or Old makernote)
155	$countfieldbits = $new ? 1 : 2;
156	// New makernote repeats 1-byte value twice, so increment $place by 2 in either case.
157	$num = bin2hex(substr($block, $place, $countfieldbits));
158	$place += 2;
159	if ($intel == 1) {
160		$num = intel2Moto($num);
161	}
162	$ntags = hexdec($num);
163	$result['SubIFD']['MakerNote']['MakerNoteNumTags'] = $ntags;
164
165	//loop thru all tags  Each field is 12 bytes
166	for ($i = 0; $i < $ntags; $i++) {
167		//2 byte tag
168		$tag = bin2hex(substr($block, $place, 2));
169		$place += 2;
170		if ($intel == 1) {
171			$tag = intel2Moto($tag);
172		}
173		$tag_name = lookup_Olympus_tag($tag);
174
175		//2 byte type
176		$type = bin2hex(substr($block, $place, 2));
177		$place += 2;
178		if ($intel == 1) {
179			$type = intel2Moto($type);
180		}
181		lookup_type($type, $size);
182
183		//4 byte count of number of data units
184		$count = bin2hex(substr($block, $place, 4));
185		$place += 4;
186		if ($intel == 1) {
187			$count = intel2Moto($count);
188		}
189		$bytesofdata = $size * hexdec($count);
190
191		//4 byte value of data or pointer to data
192		$value = substr($block, $place, 4);
193		$place += 4;
194
195		if ($bytesofdata <= 4) {
196			$data = substr($value, 0, $bytesofdata);
197		} else {
198			$value = bin2hex($value);
199			if ($intel == 1) {
200				$value = intel2Moto($value);
201			}
202			$v = fseek($seek, $globalOffset + hexdec($value)); //offsets are from TIFF header which is 12 bytes from the start of the file
203			if (isset($GLOBALS['exiferFileSize']) && $v == 0 && $bytesofdata < $GLOBALS['exiferFileSize']) {
204				$data = fread($seek, $bytesofdata);
205			} else {
206				$result['Errors'] = $result['Errors']++;
207				$data = '';
208			}
209		}
210		$formated_data = formatOlympusData($type, $tag, $intel, $data);
211
212		if ($result['VerboseOutput'] == 1) {
213			$result['SubIFD']['MakerNote'][$tag_name] = $formated_data;
214			if ($type == "URATIONAL" || $type == "SRATIONAL" || $type == "USHORT" || $type == "SSHORT" || $type == "ULONG" || $type == "SLONG" || $type == "FLOAT" || $type == "DOUBLE") {
215				$data = bin2hex($data);
216				if ($intel == 1) {
217					$data = intel2Moto($data);
218				}
219			}
220			$result['SubIFD']['MakerNote'][$tag_name . "_Verbose"]['RawData'] = $data;
221			$result['SubIFD']['MakerNote'][$tag_name . "_Verbose"]['Type'] = $type;
222			$result['SubIFD']['MakerNote'][$tag_name . "_Verbose"]['Bytes'] = $bytesofdata;
223		} else {
224			$result['SubIFD']['MakerNote'][$tag_name] = $formated_data;
225		}
226	}
227}
228