334 lines
11 KiB
PHP
334 lines
11 KiB
PHP
<?php
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/******************************************************************************
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*
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* Filename: EXIF_Makernote.php
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*
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* Description: Provides functions for reading EXIF Makernote Information
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* The actual functions for reading each manufacturers makernote
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* are provided in the Makernotes directory.
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*
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* Author: Evan Hunter
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*
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* Date: 23/7/2004
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*
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* Project: PHP JPEG Metadata Toolkit
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*
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* Revision: 1.11
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*
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* Changes: 1.00 -> 1.11 : changed makernotes directory definition to allow
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* the toolkit to be portable across directories
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*
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* URL: http://electronics.ozhiker.com
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*
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* Copyright: Copyright Evan Hunter 2004
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*
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* License: This file is part of the PHP JPEG Metadata Toolkit.
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*
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* The PHP JPEG Metadata Toolkit is free software; you can
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* redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The PHP JPEG Metadata Toolkit is distributed in the hope
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* that it will be useful, but WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with the PHP JPEG Metadata Toolkit; if not,
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* write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* If you require a different license for commercial or other
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* purposes, please contact the author: evan@ozhiker.com
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*
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******************************************************************************/
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// Create the Makernote Parser and Interpreter Function Array
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$GLOBALS['Makernote_Function_Array'] = array( "Read_Makernote_Tag" => array( ),
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"get_Makernote_Text_Value" => array( ),
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"Interpret_Makernote_to_HTML" => array( ) );
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// Include the Main TIFF and EXIF Tags array
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include_once $JPEG_TOOLKIT.'EXIF.php';
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/******************************************************************************
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*
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* Include the Makernote Scripts
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*
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******************************************************************************/
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// Set the Makernotes Directory
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$dir = dirname(__FILE__) . "/Makernotes/"; // Change: as of version 1.11 - to allow directory portability
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// Open the directory
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$dir_hnd = @opendir ( $dir );
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// Cycle through each of the files in the Makernotes directory
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while ( ( $file = readdir( $dir_hnd ) ) !== false )
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{
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// Check if the current item is a file
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if ( is_file ( $dir . $file ) )
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{
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// Item is a file, break it into it's parts
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$path_parts = pathinfo( $dir . $file );
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// Check if the extension is php
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if ( $path_parts["extension"] == "php" )
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{
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// This is a php script - include it
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include_once ($dir . $file) ;
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}
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}
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}
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// close the directory
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closedir( $dir_hnd );
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/******************************************************************************
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*
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* Function: Read_Makernote_Tag
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*
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* Description: Attempts to decodes the Makernote tag supplied, returning the
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* new tag with the decoded information attached.
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*
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* Parameters: Makernote_Tag - the element of an EXIF array containing the
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* makernote, as returned from get_EXIF_JPEG
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* EXIF_Array - the entire EXIF array containing the
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* makernote, as returned from get_EXIF_JPEG, in
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* case more information is required for decoding
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* filehnd - an open file handle for the file containing the
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* makernote - does not have to be positioned at the
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* start of the makernote
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*
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*
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* Returns: Makernote_Tag - the Makernote_Tag from the parameters, but
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* modified to contain the decoded information
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*
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******************************************************************************/
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function Read_Makernote_Tag( $Makernote_Tag, $EXIF_Array, $filehnd )
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{
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// Check if the Makernote is present but empty - this sometimes happens
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if ( ( strlen( $Makernote_Tag['Data'] ) === 0 ) ||
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( $Makernote_Tag['Data'] === str_repeat ( "\x00", strlen( $Makernote_Tag['Data'] )) ) )
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{
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// Modify the makernote to display that it is empty
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$Makernote_Tag['Decoded Data'] = "Empty";
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$Makernote_Tag['Makernote Type'] = "Empty";
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$Makernote_Tag['Makernote Tags'] = "Empty";
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$Makernote_Tag['Decoded'] = TRUE;
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// Return the new makernote
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return $Makernote_Tag;
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}
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// Check if the Make Field exists in the TIFF IFD
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if ( array_key_exists ( 271, $EXIF_Array[0] ) )
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{
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// A Make tag exists in IFD0, collapse multiple strings (if any), and save result
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$Make_Field = implode ( "\n", $EXIF_Array[0][271]['Data']);
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}
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else
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{
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// No Make field found
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$Make_Field = "";
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}
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// Cycle through each of the "Read_Makernote_Tag" functions
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foreach( $GLOBALS['Makernote_Function_Array']['Read_Makernote_Tag'] as $func )
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{
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// Run the current function, and save the result
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$New_Makernote_Tag = $func( $Makernote_Tag, $EXIF_Array, $filehnd, $Make_Field );
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// Check if a valid result was returned
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if ( $New_Makernote_Tag !== FALSE )
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{
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// A valid result was returned - stop cycling
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break;
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}
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}
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// Check if a valid result was returned
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if ( $New_Makernote_Tag === false )
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{
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// A valid result was NOT returned - construct a makernote tag representing this
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$New_Makernote_Tag = $Makernote_Tag;
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$New_Makernote_Tag['Decoded'] = FALSE;
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$New_Makernote_Tag['Makernote Type'] = "Unknown Makernote";
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}
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// Return the new makernote tag
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return $New_Makernote_Tag;
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}
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/******************************************************************************
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* End of Function: Read_Makernote_Tag
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******************************************************************************/
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/******************************************************************************
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*
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* Function: get_Makernote_Text_Value
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*
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* Description: Attempts to provide a text value for any makernote tag marked
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* as type special. Returns false no handler could be found to
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* process the tag
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*
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* Parameters: Exif_Tag - the element of an the Makernote array containing the
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* tag in question, as returned from Read_Makernote_Tag
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* Tag_Definitions_Name - The name of the Tag Definitions group
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* within the global array IFD_Tag_Definitions
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*
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*
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* Returns: output - the text value for the tag
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* FALSE - If no handler could be found to process this tag, or if
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* an error occured in decoding
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*
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******************************************************************************/
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function get_Makernote_Text_Value( $Tag, $Tag_Definitions_Name )
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{
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// Cycle through each of the "get_Makernote_Text_Value" functions
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foreach( $GLOBALS['Makernote_Function_Array']['get_Makernote_Text_Value'] as $func )
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{
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// Run the current function, and save the result
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$Text_Val = $func( $Tag, $Tag_Definitions_Name );
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// Check if a valid result was returned
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if ( $Text_Val !== FALSE )
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{
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// valid result - return it
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return $Text_Val;
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}
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}
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// No Special tag handler found for this tag - return false
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return FALSE;
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}
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/******************************************************************************
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* End of Function: get_Makernote_Text_Value
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******************************************************************************/
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/******************************************************************************
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*
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* Function: Interpret_Makernote_to_HTML
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*
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* Description: Attempts to interpret a makernote into html.
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*
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* Parameters: Makernote_Tag - the element of an EXIF array containing the
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* makernote, as returned from get_EXIF_JPEG
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* filename - the name of the JPEG file being processed ( used
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* by scripts which display embedded thumbnails)
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*
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*
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* Returns: output - the html representing the makernote
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*
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******************************************************************************/
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function Interpret_Makernote_to_HTML( $Makernote_tag, $filename )
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{
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// Create a string to receive the HTML
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$output_str = "";
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// Check if the makernote tag is valid
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if ( $Makernote_tag === FALSE )
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{
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// No makernote info - return
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return $output_str;
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}
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// Check if the makernote has been marked as unknown
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if ( $Makernote_tag['Makernote Type'] == "Unknown Makernote" )
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{
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// Makernote is unknown - return message
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$output_str .= "<h4 class=\"EXIF_Makernote_Small_Heading\">Unknown Makernote Coding</h4>\n";
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return $output_str;
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}
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else
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{
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// Makernote is known - add a heading to the output
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$output_str .= "<p class=\"EXIF_Makernote_Text\">Makernote Coding: " . $Makernote_tag['Makernote Type'] . "</p>\n";
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}
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// Check if this is an empty makernote
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if ( $Makernote_tag['Makernote Type'] == "Empty" )
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{
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// It is empty - don't try to interpret
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return $output_str;
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}
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// Cycle through each of the "Interpret_Makernote_to_HTML" functions
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foreach( $GLOBALS['Makernote_Function_Array']['Interpret_Makernote_to_HTML'] as $func )
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{
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// Run the current function, and save the result
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$html_text = $func( $Makernote_tag, $filename );
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// Check if a valid result was returned
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if ( $html_text !== FALSE )
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{
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// valid result - return it
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return $output_str . $html_text;
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}
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}
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// No Interpreter function handled the makernote - return a message
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$output_str .= "<h4 class=\"EXIF_Makernote_Small_Heading\">Could not Decode Makernote, it may be corrupted or empty</h4>\n";
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return $output_str;
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}
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/******************************************************************************
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* End of Function: Interpret_Makernote_to_HTML
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******************************************************************************/
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?>
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