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Diffstat (limited to 'includes/jpeg_metadata_tk/get_minolta_thumb.php')
| -rw-r--r-- | includes/jpeg_metadata_tk/get_minolta_thumb.php | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/includes/jpeg_metadata_tk/get_minolta_thumb.php b/includes/jpeg_metadata_tk/get_minolta_thumb.php new file mode 100644 index 0000000..eecea8a --- /dev/null +++ b/includes/jpeg_metadata_tk/get_minolta_thumb.php @@ -0,0 +1,195 @@ +<?php + +/****************************************************************************** +* +* Filename: get_minolta_thumb.php +* +* Description: This script extracts a Minolta EXIF Makernote Thumbnail +* from within a JPEG file and allows it to be displayed +* +* Usage: get_minolta_thumb?filename=<filename> +* +* Author: Evan Hunter +* +* Date: 23/7/2004 +* +* Project: PHP JPEG Metadata Toolkit +* +* Revision: 1.00 +* +* URL: http://electronics.ozhiker.com +* +* Copyright: Copyright Evan Hunter 2004 +* +* License: This file is part of the PHP JPEG Metadata Toolkit. +* +* The PHP JPEG Metadata Toolkit 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. +* +* The PHP JPEG Metadata Toolkit 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. +* +* You should have received a copy of the GNU General Public +* License along with the PHP JPEG Metadata Toolkit; if not, +* write to the Free Software Foundation, Inc., 59 Temple +* Place, Suite 330, Boston, MA 02111-1307 USA +* +* If you require a different license for commercial or other +* purposes, please contact the author: evan@ozhiker.com +* +******************************************************************************/ + + + // Ensure that nothing can write to the standard io, before we get the header out + ob_start( ); + + + require_once 'EXIF.php'; + + + // retrieve the filename from the URL parameters + + $filename = $GLOBALS['HTTP_GET_VARS']['filename']; + + // Retrieve any EXIF data in the file + + $Exif_array = get_EXIF_JPEG( $filename ); + + + // Check if any EXIF data was retrieved + if ( $Exif_array === FALSE ) + { + // No EXIF data was found - abort + ob_end_clean ( ); + echo "<p>Error getting EXIF Information</p>\n"; + return; + } + + + // Check that there is at least the Zeroth IFD in the array + if ( count( $Exif_array ) < 1 ) + { + ob_end_clean ( ); + echo "<p>Couldn't find TIFF IFD 0</p>\n"; + return; + } + + + + // Check that the EXIF IFD exists + if ( array_key_exists( 34665, $Exif_array[0] ) ) + { + // Found the EXIF IFD, + + // Check that the makernote tag exists + if ( array_key_exists( 37500, $Exif_array[0][34665]['Data'][0] ) ) + { + // Makernote Exists + + // Check that the Makernote is Olympus + if ( $Exif_array[0][34665]['Data'][0][37500]['Makernote Tags'] == "Olympus" ) + { + // Makernote is Olympus + // Check if an IFD exists for the makernote + if ( array_key_exists( 0, $Exif_array[0][34665]['Data'][0][37500]['Decoded Data'] ) ) + { + // Check if the Thumbnail tag 0x0088 exists + if ( array_key_exists( 0x0088, $Exif_array[0][34665]['Data'][0][37500]['Decoded Data'][0] ) ) + { + // Found a Thumbnail + // Get the data + $data = $Exif_array[0][34665]['Data'][0][37500]['Decoded Data'][0][0x0088]['Data']; + + // Sometimes the Minolta thumbnails are corrupt as there is no data + // Check that the data is OK + if ( $data !== FALSE ) + { + // Minolta thumbnails seem to have the first byte incorrect - this could possibly be a counter in case the thumbnail needs to span more than one tag + // Restore the first byte of the jpeg thumbnail + $data{0} = "\xff"; + + // Display the thumbnail + ob_end_clean ( ); + header("Content-type: image/jpeg"); + print $data; + } + else + { + // Thumbnail data is missing - display message + ob_end_clean ( ); + echo "<p>Thumbnail missing</p>\n"; + } + } + // Check if the Thumbnail tag 0x0081 exists + else if ( array_key_exists( 0x0081, $Exif_array[0][34665]['Data'][0][37500]['Decoded Data'][0] ) ) + { + // Found a Thumbnail + // Get the data + $data = $Exif_array[0][34665]['Data'][0][37500]['Decoded Data'][0][0x0081]['Data']; + + // Sometimes the Minolta thumbnails are corrupt as there is no data + // Check that the data is OK + if ( $data !== FALSE ) + { + // Minolta thumbnails seem to have the first byte incorrect - this could possibly be a counter in case the thumbnail needs to span more than one tag + // Restore the first byte of the jpeg thumbnail + $data{0} = "\xff"; + + // Display the thumbnail + ob_end_clean ( ); + header("Content-type: image/jpeg"); + print $data ; + } + else + { + // Thumbnail data is missing - display message + ob_end_clean ( ); + echo "<p>Thumbnail missing</p>\n"; + } + } + else + { + // Couldn't find a Minolta thumbnail tag - display message + ob_end_clean ( ); + echo "<p>Couldn't find Minolta Thumbnail Tag</p>\n"; + } + } + else + { + // Couldn't find an IFD in the Makernote tag - display message + ob_end_clean ( ); + echo "<p>Makernote Doesn't contain IFD 0</p>\n"; + } + + } + else + { + // Makernote does not use Olympus tags - display message + ob_end_clean ( ); + echo "<p>Not an Olympus Makernote</p>\n"; + } + } + else + { + // Couldn't find Makernote tag - display message + ob_end_clean ( ); + echo "<p>Couldn't find Makernote</p>\n"; + } + } + else + { + // Couldn't find the EXIF IFD - display message + ob_end_clean ( ); + echo "<p>Couldn't find Exif IFD</p>\n"; + } + + + return; + +?> |