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Diffstat (limited to 'includes/jpeg_metadata_tk/get_ps_thumb.php')
| -rw-r--r-- | includes/jpeg_metadata_tk/get_ps_thumb.php | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/includes/jpeg_metadata_tk/get_ps_thumb.php b/includes/jpeg_metadata_tk/get_ps_thumb.php new file mode 100644 index 0000000..966c328 --- /dev/null +++ b/includes/jpeg_metadata_tk/get_ps_thumb.php @@ -0,0 +1,176 @@ +<?php + +/****************************************************************************** +* +* Filename: get_ps_thumb.php +* +* Description: This script extracts a Photoshop IRB (Image Resource Block) +* thumbnail from within a JPEG file and allows it to be displayed +* +* Usage: get_ps_thumb?filename=<filename> +* +* Author: Evan Hunter +* +* Date: 23/7/2004 +* +* Project: PHP JPEG Metadata Toolkit +* +* Revision: 1.11 +* +* 1.00 -> 1.11 : Added support for Photoshop IRB thumbnails which are +* embedded within EXIF information (used in TIFF files) +* +* 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( ); + + + // retrieve the filename from the URL parameters + + $filename = $GLOBALS['HTTP_GET_VARS']['filename']; + + // Change: Check for file extension rather than assuming JPEG as of 1.11 + // Retrieve the Filename Extension + $path_parts = pathinfo( $filename ); + + // Check if the Extension is JPEG + if ( ( strcasecmp( $path_parts["extension"], "jpg" ) == 0 ) || + ( strcasecmp( $path_parts["extension"], "jpeg" ) == 0 ) ) + { + // JPEG Extension + + require_once 'JPEG.php'; + require_once 'Photoshop_IRB.php'; + + // Retrieve the JPEG header Data + + $jpeg_header_data = get_jpeg_header_data( $filename ); + + // Retrieve any Photoshop IRB data in the file + + $IRB_array = get_Photoshop_IRB( $jpeg_header_data ); + + // Check if Photoshop IRB data was retrieved + + if ( $IRB_array === FALSE ) + { + // No Photoshop IRB data could be retrieved - abort + ob_end_clean ( ); + echo "<p>Photoshop IRB could not be retrieved from the JPEG file</p>\n"; + return; + } + + // Cycle through the resources in the Photoshop IRB + // Until either a thumbnail resource is found or + // there are no more resources + $i = 0; + while ( ( $i < count( $IRB_array ) ) && + ( $IRB_array[$i]['ResID'] != 0x0409 ) && + ( $IRB_array[$i]['ResID'] != 0x040C ) ) + { + $i++; + } + + + // Check if a thumbnail was found + if ( $i < count( $IRB_array ) ) + { + // A thumbnail was found, Display it + ob_end_clean ( ); + header("Content-type: image/jpeg"); + print substr( $IRB_array[$i]['ResData'] , 28 ); + } + } + // Change: Add support for TIFF Photoshop IRB thumbnails as of 1.11 + // Check if file has TIFF extension + else if ( ( strcasecmp( $path_parts["extension"], "tif" ) == 0 ) || + ( strcasecmp( $path_parts["extension"], "tiff" ) == 0 ) ) + { + // TIFF Extension + + require_once 'EXIF.php'; + + // Retrieve the EXIF info + $exif_array = get_EXIF_TIFF( $filename ); + + // Retrieve any Photoshop IRB data in the EXIF + if ( ( array_key_exists( 0, $exif_array ) ) && + ( array_key_exists( 34377, $exif_array[0] ) ) && + ( array_key_exists( 'Data', $exif_array[0][34377] ) ) ) + { + $IRB_array = $exif_array[0][34377]['Data']; + + // Check if Photoshop IRB data was retrieved + + if ( $IRB_array === FALSE ) + { + // No Photoshop IRB data could be retrieved - abort + ob_end_clean ( ); + echo "<p>Photoshop IRB could not be retrieved from the TIFF file</p>\n"; + return; + } + + // Cycle through the resources in the Photoshop IRB + // Until either a thumbnail resource is found or + // there are no more resources + $i = 0; + while ( ( $i < count( $IRB_array ) ) && + ( $IRB_array[$i]['ResID'] != 0x0409 ) && + ( $IRB_array[$i]['ResID'] != 0x040C ) ) + { + $i++; + } + + + // Check if a thumbnail was found + if ( $i < count( $IRB_array ) ) + { + // A thumbnail was found, Display it + ob_end_clean ( ); + header("Content-type: image/jpeg"); + print substr( $IRB_array[$i]['ResData'] , 28 ); + } + } + else + { + // Embedded Photoshop IRB block not found + ob_end_clean ( ); + echo "No Photoshop IRB found within EXIF"; + } + } + else + { + // Unknown extension + ob_end_clean ( ); + echo "Unknown file Type"; + } + + +?> |