1 | <?php |
---|
2 | |
---|
3 | /****************************************************************************** |
---|
4 | * |
---|
5 | * Filename: PIM.php |
---|
6 | * |
---|
7 | * Description: Provides functions for reading, writing and interpreting a |
---|
8 | * Print Image Matching information data block. |
---|
9 | * |
---|
10 | * Author: Evan Hunter |
---|
11 | * |
---|
12 | * Date: 23/7/2004 |
---|
13 | * |
---|
14 | * Project: PHP JPEG Metadata Toolkit |
---|
15 | * |
---|
16 | * Revision: 1.00 |
---|
17 | * |
---|
18 | * URL: http://electronics.ozhiker.com |
---|
19 | * |
---|
20 | * Copyright: Copyright " . $auteur . " 2004 |
---|
21 | * |
---|
22 | * License: This file is part of the PHP JPEG Metadata Toolkit. |
---|
23 | * |
---|
24 | * The PHP JPEG Metadata Toolkit is free software; you can |
---|
25 | * redistribute it and/or modify it under the terms of the |
---|
26 | * GNU General Public License as published by the Free Software |
---|
27 | * Foundation; either version 2 of the License, or (at your |
---|
28 | * option) any later version. |
---|
29 | * |
---|
30 | * The PHP JPEG Metadata Toolkit is distributed in the hope |
---|
31 | * that it will be useful, but WITHOUT ANY WARRANTY; without |
---|
32 | * even the implied warranty of MERCHANTABILITY or FITNESS |
---|
33 | * FOR A PARTICULAR PURPOSE. See the GNU General Public License |
---|
34 | * for more details. |
---|
35 | * |
---|
36 | * You should have received a copy of the GNU General Public |
---|
37 | * License along with the PHP JPEG Metadata Toolkit; if not, |
---|
38 | * write to the Free Software Foundation, Inc., 59 Temple |
---|
39 | * Place, Suite 330, Boston, MA 02111-1307 USA |
---|
40 | * |
---|
41 | * If you require a different license for commercial or other |
---|
42 | * purposes, please contact the author: evan@ozhiker.com |
---|
43 | * |
---|
44 | ******************************************************************************/ |
---|
45 | |
---|
46 | |
---|
47 | include_once "EXIF.php"; |
---|
48 | |
---|
49 | // TODO Find out definitions of Print Image Matching Info tags |
---|
50 | |
---|
51 | |
---|
52 | /****************************************************************************** |
---|
53 | * |
---|
54 | * Function: Decode_PIM |
---|
55 | * |
---|
56 | * Description: Decodes the contents of a EXIF tag containing Print Image |
---|
57 | * Matching information, and returns the contents as an array |
---|
58 | * |
---|
59 | * Parameters: tag - An EXIF tag containing Print Image Matching information |
---|
60 | * as from get_EXIF_JPEG |
---|
61 | * Tag_Definitions_Name - The name of the Tag Definitions group |
---|
62 | * within the global array IFD_Tag_Definitions |
---|
63 | * |
---|
64 | * Returns: newtag - The EXIF tag, modified with the data field containing |
---|
65 | * an array of the PIM contents |
---|
66 | * |
---|
67 | ******************************************************************************/ |
---|
68 | |
---|
69 | function Decode_PIM( $tag, $Tag_Definitions_Name ) |
---|
70 | { |
---|
71 | |
---|
72 | // Create a new EXIF tag for the output |
---|
73 | $newtag = $tag; |
---|
74 | |
---|
75 | // Check that this tag is for Print Image Matching Info |
---|
76 | if ( $tag['Type'] == "PIM" ) |
---|
77 | { |
---|
78 | |
---|
79 | // Check that the data starts with PrintIM |
---|
80 | if ( substr( $tag['Data'], 0, 8 ) == "PrintIM\x00" ) |
---|
81 | { |
---|
82 | |
---|
83 | // Find the end of the version string |
---|
84 | if ( ( $ver_pos = strpos ( $tag['Data'], "\0", 8 ) ) == -1 ) |
---|
85 | { |
---|
86 | // couldn't find the start of the version string |
---|
87 | return $newtag; |
---|
88 | } |
---|
89 | |
---|
90 | // Create an array to receive the Data |
---|
91 | $newtag['Data'] = array( ); |
---|
92 | |
---|
93 | // Extract the PrintIM version |
---|
94 | $newtag['Data']['Version'] = substr( $tag['Data'], 8, $ver_pos - 8 ); |
---|
95 | // Skip the position over the version |
---|
96 | $count_pos = $ver_pos+2; |
---|
97 | |
---|
98 | // Extract the count of tags - 2 bytes |
---|
99 | $PI_tag_count = get_IFD_Data_Type( substr($tag['Data'], $count_pos, 2) , 3, $tag['Byte Align'] ); |
---|
100 | |
---|
101 | // Panasonic have put an extra Null after the Version, which |
---|
102 | // causes the tag count to be wrong - |
---|
103 | // check if it is zero - i.e. possibly wrong |
---|
104 | if ( ( $PI_tag_count == 0 ) ) |
---|
105 | { |
---|
106 | // Tag count is zero - try moving the position by one, |
---|
107 | // then re-extracting the count |
---|
108 | $count_pos++; |
---|
109 | $PI_tag_count = get_IFD_Data_Type( substr($tag['Data'], $count_pos, 2) , 3, $tag['Byte Align'] ); |
---|
110 | } |
---|
111 | |
---|
112 | // Extract the data part of the PrintIM block |
---|
113 | $data_part = substr($tag['Data'], $count_pos+2); |
---|
114 | |
---|
115 | // Cycle through each tag |
---|
116 | for ( $a = 0; $a < $PI_tag_count; $a++ ) |
---|
117 | { |
---|
118 | // Read the tag number - 2 bytes |
---|
119 | $PI_tag = get_IFD_Data_Type( substr($data_part, $a*6, 2) , 3, $tag['Byte Align'] ); |
---|
120 | |
---|
121 | // Read the tag data - 4 bytes |
---|
122 | $newtag['Data'][ ] = array( 'Tag Number' => $PI_tag, 'Data' => substr($data_part, $a*6+2, 4) , 'Decoded' => False ); |
---|
123 | } |
---|
124 | } |
---|
125 | |
---|
126 | } |
---|
127 | |
---|
128 | // Return the updated tag |
---|
129 | return $newtag; |
---|
130 | |
---|
131 | } |
---|
132 | |
---|
133 | /****************************************************************************** |
---|
134 | * End of Function: Decode_PIM |
---|
135 | ******************************************************************************/ |
---|
136 | |
---|
137 | |
---|
138 | |
---|
139 | |
---|
140 | /****************************************************************************** |
---|
141 | * |
---|
142 | * Function: Encode_PIM |
---|
143 | * |
---|
144 | * Description: Encodes the contents of a EXIF tag containing Print Image |
---|
145 | * Matching information, and returns the contents as a packed binary string |
---|
146 | * |
---|
147 | * Parameters: tag - An EXIF tag containing Print Image Matching information |
---|
148 | * as from get_EXIF_JPEG |
---|
149 | * Byte_Align - the Byte alignment to use - "MM" or "II" |
---|
150 | * |
---|
151 | * Returns: packed_data - The packed binary string representing the PIM data |
---|
152 | * |
---|
153 | ******************************************************************************/ |
---|
154 | |
---|
155 | function Encode_PIM( $tag, $Byte_Align) |
---|
156 | { |
---|
157 | |
---|
158 | // Create a string to receive the packed data |
---|
159 | $packed_data = ""; |
---|
160 | |
---|
161 | // Check that this tag is for Print Image Matching Info |
---|
162 | if ( $tag['Type'] == "PIM" ) |
---|
163 | { |
---|
164 | // Check that the tag has been decoded - otherwise we don't need to do anything |
---|
165 | if ( ( is_array( $tag['Data'] ) ) && |
---|
166 | ( count ( $tag['Data'] ) > 0 ) ) |
---|
167 | { |
---|
168 | // Add the header to the packed data |
---|
169 | $packed_data .= "PrintIM\x00"; |
---|
170 | |
---|
171 | // Add the version to the packed data |
---|
172 | $packed_data .= $tag['Data']['Version'] . "\x00"; |
---|
173 | |
---|
174 | // Create a string to receive the tag data |
---|
175 | $tag_data_str = ""; |
---|
176 | |
---|
177 | // Cycle through each tag |
---|
178 | $tag_count = 0; |
---|
179 | foreach( $tag['Data'] as $key => $curr_tag ) |
---|
180 | { |
---|
181 | // Make sure this is a tag and not supplementary info |
---|
182 | if ( is_numeric( $key ) ) |
---|
183 | { |
---|
184 | // Count how many tags are created |
---|
185 | $tag_count++; |
---|
186 | |
---|
187 | // Add the tag number to the packed tag data |
---|
188 | $tag_data_str .= put_IFD_Data_Type( $curr_tag['Tag Number'], 3, $Byte_Align ); |
---|
189 | |
---|
190 | // Add the tag data to the packed tag data |
---|
191 | $tag_data_str .= $curr_tag['Data']; |
---|
192 | } |
---|
193 | } |
---|
194 | |
---|
195 | // Add the tag count to the packed data |
---|
196 | $packed_data .= put_IFD_Data_Type( $tag_count, 3, $Byte_Align ); |
---|
197 | |
---|
198 | // Add the packed tag data to the packed data |
---|
199 | $packed_data .= $tag_data_str; |
---|
200 | } |
---|
201 | } |
---|
202 | |
---|
203 | // Return the resulting packed data |
---|
204 | return $packed_data; |
---|
205 | |
---|
206 | } |
---|
207 | |
---|
208 | /****************************************************************************** |
---|
209 | * End of Function: Encode_PIM |
---|
210 | ******************************************************************************/ |
---|
211 | |
---|
212 | |
---|
213 | |
---|
214 | |
---|
215 | |
---|
216 | |
---|
217 | |
---|
218 | |
---|
219 | |
---|
220 | |
---|
221 | /****************************************************************************** |
---|
222 | * |
---|
223 | * Function: get_PIM_Text_Value |
---|
224 | * |
---|
225 | * Description: Interprets the contents of a EXIF tag containing Print Image |
---|
226 | * Matching information, and returns content as as a text string |
---|
227 | * |
---|
228 | * Parameters: tag - An EXIF tag containing Print Image Matching information |
---|
229 | * as from get_EXIF_JPEG |
---|
230 | * Tag_Definitions_Name - The name of the Tag Definitions group |
---|
231 | * within the global array IFD_Tag_Definitions |
---|
232 | * |
---|
233 | * Returns: output_str - The text string representing the PIM info |
---|
234 | * |
---|
235 | ******************************************************************************/ |
---|
236 | |
---|
237 | function get_PIM_Text_Value( $Tag, $Tag_Definitions_Name ) |
---|
238 | { |
---|
239 | |
---|
240 | // Create a string to receive the output |
---|
241 | $output_str = ""; |
---|
242 | |
---|
243 | // Check if the PIM tag has been decoded |
---|
244 | if ( ( is_array( $Tag['Data'] ) ) && |
---|
245 | ( count ( $Tag['Data'] ) > 0 ) ) |
---|
246 | { |
---|
247 | // The tag has been decoded |
---|
248 | |
---|
249 | // Add the Version to the output |
---|
250 | $output_str = "Version: " . $Tag['Data']['Version'] . "\n"; |
---|
251 | |
---|
252 | // Check if the user wants to hide unknown tags |
---|
253 | if ( $GLOBALS['HIDE_UNKNOWN_TAGS'] == FALSE ) |
---|
254 | { |
---|
255 | // The user wants to see unknown tags |
---|
256 | // Cycle through each tag |
---|
257 | foreach ( $Tag['Data'] as $PIM_tag_Key => $PIM_tag ) |
---|
258 | { |
---|
259 | // Check that the tag is not the version array element |
---|
260 | if ( $PIM_tag_Key !== 'Version' ) |
---|
261 | { |
---|
262 | // Add the tag to the output |
---|
263 | $output_str .= "Unknown Tag " . $PIM_tag['Tag Number'] . ": (" . strlen( $PIM_tag['Data'] ) . " bytes of data)\n"; |
---|
264 | } |
---|
265 | } |
---|
266 | } |
---|
267 | } |
---|
268 | |
---|
269 | // Return the output text |
---|
270 | return $output_str; |
---|
271 | } |
---|
272 | |
---|
273 | /****************************************************************************** |
---|
274 | * End of Function: get_PIM_Text_Value |
---|
275 | ******************************************************************************/ |
---|
276 | |
---|
277 | |
---|
278 | |
---|
279 | ?> |
---|