/add-ons/pjmt/EXIF.php
PHP | 2756 lines | 1220 code | 535 blank | 1001 comment | 345 complexity | 2353c9009d322040cc8481d3e2063908 MD5 | raw file
Possible License(s): LGPL-2.0, LGPL-2.1, GPL-3.0, Apache-2.0, BSD-3-Clause
- <?
-
- /******************************************************************************
- *
- * Filename: EXIF.php
- *
- * Description: Provides functions for reading and writing EXIF Information
- * to/from an APP1 segment of a JPEG file
- * Unfortunately, because EXIF data may be distributed anywhere
- * throughout an image file, rather than just being in one block,
- * it is impossible to pass just a string containing only the EXIF
- * information. Hence it is neccessary to be able to seek to
- * any point in the file. This causes the HTTP and FTP wrappers
- * not to work - i.e. the EXIF functions will only work with local
- * files.
- * To work on an internet file, copy it locally to start with:
- *
- * $newfilename = tempnam ( $dir, "tmpexif" );
- * copy ( "http://whatever.com", $newfilename );
- *
- *
- * Author: Evan Hunter
- *
- * Date: 30/7/2004
- *
- * Project: PHP JPEG Metadata Toolkit
- *
- * Revision: 1.11
- *
- * Changes: 1.00 -> 1.10 : added function get_EXIF_TIFF to allow extracting EXIF from a TIFF file
- * 1.10 -> 1.11 : added functionality to allow decoding of XMP and Photoshop IRB information
- * embedded within the EXIF data
- * added checks for http and ftp wrappers, as these are not supported
- * changed interpret_IFD to allow thumbnail links to work when
- * toolkit is portable across directories
- *
- *
- * 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
- *
- ******************************************************************************/
-
-
- // TODO : Thoroughly test the functions for writing EXIF segments
- // TODO : Figure out a way to allow EXIF to function normally with HTTP and FTP wrappers
- // TODO : Implement EXIF decoding of Device Setting Description field
- // TODO : Implement EXIF decoding of SpatialFrequencyResponse field
- // TODO : Implement EXIF decoding of OECF field
- // TODO : Implement EXIF decoding of SubjectArea field
- // TODO : Add a put_EXIF_TIFF function
-
- /******************************************************************************
- *
- * Initialisation
- *
- ******************************************************************************/
-
-
- if ( !isset( $GLOBALS['HIDE_UNKNOWN_TAGS'] ) ) $GLOBALS['HIDE_UNKNOWN_TAGS']= FALSE;
- if ( !isset( $GLOBALS['SHOW_BINARY_DATA_HEX'] ) ) $GLOBALS['SHOW_BINARY_DATA_HEX'] = FALSE;
- if ( !isset( $GLOBALS['SHOW_BINARY_DATA_TEXT'] ) ) $GLOBALS['SHOW_BINARY_DATA_TEXT'] = FALSE;
-
-
- include_once 'EXIF_Tags.php';
- include_once 'EXIF_Makernote.php';
- include_once 'PIM.php';
- include_once 'Unicode.php';
- include_once 'JPEG.php';
- include_once 'IPTC.php';
- include_once 'Photoshop_IRB.php'; // Change: as of version 1.11 - Required for TIFF with embedded IRB
- include_once 'XMP.php'; // Change: as of version 1.11 - Required for TIFF with embedded XMP
- include_once 'pjmt_utils.php'; // Change: as of version 1.11 - Required for directory portability
-
-
-
-
-
-
-
-
- /******************************************************************************
- *
- * Function: get_EXIF_JPEG
- *
- * Description: Retrieves information from a Exchangeable Image File Format (EXIF)
- * APP1 segment and returns it in an array.
- *
- * Parameters: filename - the filename of the JPEG image to process
- *
- * Returns: OutputArray - Array of EXIF records
- * FALSE - If an error occured in decoding
- *
- ******************************************************************************/
-
- function get_EXIF_JPEG( $filename )
- {
- // Change: Added as of version 1.11
- // Check if a wrapper is being used - these are not currently supported (see notes at top of file)
- if ( ( stristr ( $filename, "http://" ) != FALSE ) || ( stristr ( $filename, "ftp://" ) != FALSE ) )
- {
- // A HTTP or FTP wrapper is being used - show a warning and abort
- echo "HTTP and FTP wrappers are currently not supported with EXIF - See EXIF functionality documentation - a local file must be specified<br>";
- echo "To work on an internet file, copy it locally to start with:<br><br>\n";
- echo "\$newfilename = tempnam ( \$dir, \"tmpexif\" );<br>\n";
- echo "copy ( \"http://whatever.com\", \$newfilename );<br><br>\n";
- return FALSE;
- }
-
- // get the JPEG headers
- $jpeg_header_data = get_jpeg_header_data( $filename );
-
-
- // Flag that an EXIF segment has not been found yet
- $EXIF_Location = -1;
-
- //Cycle through the header segments
- for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
- {
- // If we find an APP1 header,
- if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP1" ) == 0 )
- {
- // And if it has the EXIF label,
- if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "Exif\x00\x00", 6) == 0 ) ||
- ( strncmp ( $jpeg_header_data[$i]['SegData'], "Exif\x00\xFF", 6) == 0 ) ) // For some reason, some files have a faulty EXIF name which has a 0xFF in it
- {
- // Save the location of the EXIF segment
- $EXIF_Location = $i;
- }
- }
-
- }
-
- // Check if an EXIF segment was found
- if ( $EXIF_Location == -1 )
- {
- // Couldn't find any EXIF block to decode
- return FALSE;
- }
-
- $filehnd = @fopen($filename, 'rb');
-
- // Check if the file opened successfully
- if ( ! $filehnd )
- {
- // Could't open the file - exit
- echo "<p>Could not open file $filename</p>\n";
- return FALSE;
- }
-
- fseek( $filehnd, $jpeg_header_data[$EXIF_Location]['SegDataStart'] + 6 );
-
- // Decode the Exif segment into an array and return it
- $exif_data = process_TIFF_Header( $filehnd, "TIFF" );
-
-
-
- // Close File
- fclose($filehnd);
- return $exif_data;
- }
-
- /******************************************************************************
- * End of Function: get_EXIF_JPEG
- ******************************************************************************/
-
-
-
- /******************************************************************************
- *
- * Function: put_EXIF_JPEG
- *
- * Description: Stores information into a Exchangeable Image File Format (EXIF)
- * APP1 segment from an EXIF array.
- *
- * WARNING: Because the EXIF standard allows pointers to data
- * outside the APP1 segment, if there are any such pointers in
- * a makernote, this function will DAMAGE them since it will not
- * be aware that there is an external pointer. This will often
- * happen with Makernotes that include an embedded thumbnail.
- * This damage could be prevented where makernotes can be decoded,
- * but currently this is not implemented.
- *
- *
- * Parameters: exif_data - The array of EXIF data to insert into the JPEG header
- * jpeg_header_data - The JPEG header into which the EXIF data
- * should be stored, as from get_jpeg_header_data
- *
- * Returns: jpeg_header_data - JPEG header array with the EXIF segment inserted
- * FALSE - If an error occured
- *
- ******************************************************************************/
-
- function put_EXIF_JPEG( $exif_data, $jpeg_header_data )
- {
- // pack the EXIF data into its proper format for a JPEG file
- $packed_data = get_TIFF_Packed_Data( $exif_data );
- if ( $packed_data === FALSE )
- {
- return $jpeg_header_data;
- }
-
- $packed_data = "Exif\x00\x00$packed_data";
-
- //Cycle through the header segments
- for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
- {
- // If we find an APP1 header,
- if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP1" ) == 0 )
- {
- // And if it has the EXIF label,
- if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "Exif\x00\x00", 6) == 0 ) ||
- ( strncmp ( $jpeg_header_data[$i]['SegData'], "Exif\x00\xFF", 6) == 0 ) ) // For some reason, some files have a faulty EXIF name which has a 0xFF in it
- {
- // Found a preexisting EXIF block - Replace it with the new one and return.
- $jpeg_header_data[$i]['SegData'] = $packed_data;
- return $jpeg_header_data;
- }
- }
- }
-
- // No preexisting segment segment found, insert a new one at the start of the header data.
-
- // Determine highest position of an APP segment at or below APP3, so we can put the
- // new APP3 at this position
-
-
- $highest_APP = -1;
-
- //Cycle through the header segments
- for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
- {
- // Check if we have found an APP segment at or below APP3,
- if ( ( $jpeg_header_data[$i]['SegType'] >= 0xE0 ) && ( $jpeg_header_data[$i]['SegType'] <= 0xE3 ) )
- {
- // Found an APP segment at or below APP12
- $highest_APP = $i;
- }
- }
-
- // No preexisting EXIF block found, insert a new one at the start of the header data.
- array_splice($jpeg_header_data, $highest_APP + 1 , 0, array( array( "SegType" => 0xE1,
- "SegName" => "APP1",
- "SegDesc" => $GLOBALS[ "JPEG_Segment_Descriptions" ][ 0xE1 ],
- "SegData" => $packed_data ) ) );
- return $jpeg_header_data;
-
- }
-
- /******************************************************************************
- * End of Function: put_EXIF_JPEG
- ******************************************************************************/
-
-
-
-
- /******************************************************************************
- *
- * Function: get_Meta_JPEG
- *
- * Description: Retrieves information from a Meta APP3 segment and returns it
- * in an array. Uses information supplied by the
- * get_jpeg_header_data function.
- * The Meta segment has the same format as an EXIF segment, but
- * uses different tags
- *
- * Parameters: filename - the filename of the JPEG image to process
- *
- * Returns: OutputArray - Array of Meta records
- * FALSE - If an error occured in decoding
- *
- ******************************************************************************/
-
- function get_Meta_JPEG( $filename )
- {
- // Change: Added as of version 1.11
- // Check if a wrapper is being used - these are not currently supported (see notes at top of file)
- if ( ( stristr ( $filename, "http://" ) != FALSE ) || ( stristr ( $filename, "ftp://" ) != FALSE ) )
- {
- // A HTTP or FTP wrapper is being used - show a warning and abort
- echo "HTTP and FTP wrappers are currently not supported with Meta - See EXIF/Meta functionality documentation - a local file must be specified<br>";
- echo "To work on an internet file, copy it locally to start with:<br><br>\n";
- echo "\$newfilename = tempnam ( \$dir, \"tmpmeta\" );<br>\n";
- echo "copy ( \"http://whatever.com\", \$newfilename );<br><br>\n";
- return FALSE;
- }
-
- // get the JPEG headers
- $jpeg_header_data = get_jpeg_header_data( $filename );
-
-
- // Flag that an Meta segment has not been found yet
- $Meta_Location = -1;
-
- //Cycle through the header segments
- for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
- {
- // If we find an APP3 header,
- if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP3" ) == 0 )
- {
- // And if it has the Meta label,
- if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "Meta\x00\x00", 6) == 0 ) ||
- ( strncmp ( $jpeg_header_data[$i]['SegData'], "META\x00\x00", 6) == 0 ) )
- {
- // Save the location of the Meta segment
- $Meta_Location = $i;
- }
- }
- }
-
- // Check if an EXIF segment was found
- if ( $Meta_Location == -1 )
- {
- // Couldn't find any Meta block to decode
- return FALSE;
- }
-
-
- $filehnd = @fopen($filename, 'rb');
-
- // Check if the file opened successfully
- if ( ! $filehnd )
- {
- // Could't open the file - exit
- echo "<p>Could not open file $filename</p>\n";
- return FALSE;
- }
-
- fseek( $filehnd, $jpeg_header_data[$Meta_Location]['SegDataStart'] + 6 );
-
- // Decode the Meta segment into an array and return it
- $meta = process_TIFF_Header( $filehnd, "Meta" );
-
- // Close File
- fclose($filehnd);
-
- return $meta;
- }
-
- /******************************************************************************
- * End of Function: get_Meta
- ******************************************************************************/
-
-
-
-
-
-
-
- /******************************************************************************
- *
- * Function: put_Meta_JPEG
- *
- * Description: Stores information into a Meta APP3 segment from a Meta array.
- *
- *
- * WARNING: Because the Meta (EXIF) standard allows pointers to data
- * outside the APP1 segment, if there are any such pointers in
- * a makernote, this function will DAMAGE them since it will not
- * be aware that there is an external pointer. This will often
- * happen with Makernotes that include an embedded thumbnail.
- * This damage could be prevented where makernotes can be decoded,
- * but currently this is not implemented.
- *
- *
- * Parameters: meta_data - The array of Meta data to insert into the JPEG header
- * jpeg_header_data - The JPEG header into which the Meta data
- * should be stored, as from get_jpeg_header_data
- *
- * Returns: jpeg_header_data - JPEG header array with the Meta segment inserted
- * FALSE - If an error occured
- *
- ******************************************************************************/
-
- function put_Meta_JPEG( $meta_data, $jpeg_header_data )
- {
- // pack the Meta data into its proper format for a JPEG file
- $packed_data = get_TIFF_Packed_Data( $meta_data );
- if ( $packed_data === FALSE )
- {
- return $jpeg_header_data;
- }
-
- $packed_data = "Meta\x00\x00$packed_data";
-
- //Cycle through the header segments
- for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
- {
- // If we find an APP1 header,
- if ( strcmp ( $jpeg_header_data[$i]['SegName'], "APP3" ) == 0 )
- {
- // And if it has the Meta label,
- if ( ( strncmp ( $jpeg_header_data[$i]['SegData'], "Meta\x00\x00", 6) == 0 ) ||
- ( strncmp ( $jpeg_header_data[$i]['SegData'], "META\x00\x00", 6) == 0 ) )
- {
- // Found a preexisting Meta block - Replace it with the new one and return.
- $jpeg_header_data[$i]['SegData'] = $packed_data;
- return $jpeg_header_data;
- }
- }
- }
- // No preexisting segment segment found, insert a new one at the start of the header data.
-
- // Determine highest position of an APP segment at or below APP3, so we can put the
- // new APP3 at this position
-
-
- $highest_APP = -1;
-
- //Cycle through the header segments
- for( $i = 0; $i < count( $jpeg_header_data ); $i++ )
- {
- // Check if we have found an APP segment at or below APP3,
- if ( ( $jpeg_header_data[$i]['SegType'] >= 0xE0 ) && ( $jpeg_header_data[$i]['SegType'] <= 0xE3 ) )
- {
- // Found an APP segment at or below APP12
- $highest_APP = $i;
- }
- }
-
- // No preexisting Meta block found, insert a new one at the start of the header data.
- array_splice($jpeg_header_data, $highest_APP + 1 , 0, array( array( "SegType" => 0xE3,
- "SegName" => "APP3",
- "SegDesc" => $GLOBALS[ "JPEG_Segment_Descriptions" ][ 0xE1 ],
- "SegData" => $packed_data ) ) );
- return $jpeg_header_data;
-
- }
-
- /******************************************************************************
- * End of Function: put_Meta_JPEG
- ******************************************************************************/
-
-
-
- /******************************************************************************
- *
- * Function: get_EXIF_TIFF
- *
- * Description: Retrieves information from a Exchangeable Image File Format (EXIF)
- * within a TIFF file and returns it in an array.
- *
- * Parameters: filename - the filename of the TIFF image to process
- *
- * Returns: OutputArray - Array of EXIF records
- * FALSE - If an error occured in decoding
- *
- ******************************************************************************/
-
- function get_EXIF_TIFF( $filename )
- {
- // Change: Added as of version 1.11
- // Check if a wrapper is being used - these are not currently supported (see notes at top of file)
- if ( ( stristr ( $filename, "http://" ) != FALSE ) || ( stristr ( $filename, "ftp://" ) != FALSE ) )
- {
- // A HTTP or FTP wrapper is being used - show a warning and abort
- echo "HTTP and FTP wrappers are currently not supported with TIFF - See EXIF/TIFF functionality documentation - a local file must be specified<br>";
- echo "To work on an internet file, copy it locally to start with:<br><br>\n";
- echo "\$newfilename = tempnam ( \$dir, \"tmptiff\" );<br>\n";
- echo "copy ( \"http://whatever.com\", \$newfilename );<br><br>\n";
- return FALSE;
- }
-
-
- $filehnd = @fopen($filename, 'rb');
-
- // Check if the file opened successfully
- if ( ! $filehnd )
- {
- // Could't open the file - exit
- echo "<p>Could not open file $filename</p>\n";
- return FALSE;
- }
-
- // Decode the Exif segment into an array and return it
- $exif_data = process_TIFF_Header( $filehnd, "TIFF" );
-
- // Close File
- fclose($filehnd);
- return $exif_data;
- }
-
- /******************************************************************************
- * End of Function: get_EXIF_TIFF
- ******************************************************************************/
-
-
-
-
- /******************************************************************************
- *
- * Function: Interpret_EXIF_to_HTML
- *
- * Description: Generates html detailing the contents an APP1 EXIF array
- * which was retrieved with a get_EXIF_.... function.
- * Can also be used for APP3 Meta arrays.
- *
- * Parameters: Exif_array - the EXIF array,as read from get_EXIF_....
- * filename - the name of the Image file being processed ( used
- * by scripts which displays EXIF thumbnails)
- *
- * Returns: output_str - A string containing the HTML
- *
- ******************************************************************************/
-
- function Interpret_EXIF_to_HTML( $Exif_array, $filename )
- {
- // Create the string to receive the html output
- $output_str = "";
-
- // Check if the array to process is valid
- if ( $Exif_array === FALSE )
- {
- // Exif Array is not valid - abort processing
- return $output_str;
- }
-
- // Ouput the heading according to what type of tags were used in processing
- if ( $Exif_array[ 'Tags Name' ] == "TIFF" )
- {
- $output_str .= "<h2 class=\"EXIF_Main_Heading\">Contains Exchangeable Image File Format (EXIF) Information</h2>\n";
- }
- else if ( $Exif_array[ 'Tags Name' ] == "Meta" )
- {
- $output_str .= "<h2 class=\"EXIF_Main_Heading\">Contains META Information (APP3)</h2>\n";
- }
- else
- {
- $output_str .= "<h2 class=\"EXIF_Main_Heading\">Contains " . $Exif_array[ 'Tags Name' ] . " Information</h2>\n";
- }
-
-
- // Check that there are actually items to process in the array
- if ( count( $Exif_array ) < 1 )
- {
- // No items to process in array - abort processing
- return $output_str;
- }
-
- // Output secondary heading
- $output_str .= "<h3 class=\"EXIF_Secondary_Heading\">Main Image Information</h2>\n";
-
- // Interpret the zeroth IFD to html
- $output_str .= interpret_IFD( $Exif_array[0], $filename, $Exif_array['Byte_Align'] );
-
- // Check if there is a first IFD to process
- if ( array_key_exists( 1, $Exif_array ) )
- {
- // There is a first IFD for a thumbnail
- // Add a heading for it to the output
- $output_str .= "<h3 class=\"EXIF_Secondary_Heading\">Thumbnail Information</h2>\n";
-
- // Interpret the IFD to html and add it to the output
- $output_str .= interpret_IFD( $Exif_array[1], $filename, $Exif_array['Byte_Align'] );
- }
-
- // Cycle through any other IFD's
- $i = 2;
- while ( array_key_exists( $i, $Exif_array ) )
- {
- // Add a heading for the IFD
- $output_str .= "<h3 class=\"EXIF_Secondary_Heading\">Image File Directory (IFD) $i Information</h2>\n";
-
- // Interpret the IFD to html and add it to the output
- $output_str .= interpret_IFD( $Exif_array[$i], $filename, $Exif_array['Byte_Align'] );
- $i++;
- }
-
- // Return the resulting HTML
- return $output_str;
- }
-
- /******************************************************************************
- * End of Function: Interpret_EXIF_to_HTML
- ******************************************************************************/
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- /******************************************************************************
- *
- * INTERNAL FUNCTIONS
- *
- ******************************************************************************/
-
-
-
-
-
-
-
-
-
-
-
- /******************************************************************************
- *
- * Internal Function: get_TIFF_Packed_Data
- *
- * Description: Packs TIFF IFD data from EXIF or Meta into a form ready for
- * either a JPEG EXIF/Meta segment or a TIFF file
- * This function attempts to protect the contents of an EXIF makernote,
- * by ensuring that it remains in the same position relative to the
- * TIFF header
- *
- * Parameters: tiff_data - the EXIF array,as read from get_EXIF_JPEG or get_Meta_JPEG
- *
- * Returns: packed_data - A string containing packed segment
- *
- ******************************************************************************/
-
- function get_TIFF_Packed_Data( $tiff_data )
- {
- // Check that the segment is valid
- if ( $tiff_data === FALSE )
- {
- return FALSE;
- }
-
- // Get the byte alignment
- $Byte_Align = $tiff_data['Byte_Align'];
-
- // Add the Byte Alignment to the Packed data
- $packed_data = $Byte_Align;
-
- // Add the TIFF ID to the Packed Data
- $packed_data .= put_IFD_Data_Type( 42, 3, $Byte_Align );
-
- // Create a string for the makernote
- $makernote = "";
-
- // Check if the makernote exists
- if ( $tiff_data[ 'Makernote_Tag' ] !== FALSE )
- {
- // A makernote exists - We need to ensure that it stays in the same position as it was
- // Put the Makernote before any of the IFD's by padding zeros to the correct offset
- $makernote .= str_repeat("\x00",( $tiff_data[ 'Makernote_Tag' ][ 'Offset' ] - 8 ) );
- $makernote .= $tiff_data[ 'Makernote_Tag' ]['Data'];
- }
-
- // Calculage where the zeroth ifd will be
- $ifd_offset = strlen( $makernote ) + 8;
-
- // Add the Zeroth IFD pointer to the packed data
- $packed_data .= put_IFD_Data_Type( $ifd_offset, 4, $Byte_Align );
-
- // Add the makernote to the packed data (if there was one)
- $packed_data .= $makernote;
-
- //Add the IFD's to the packed data
- $packed_data .= get_IFD_Array_Packed_Data( $tiff_data, $ifd_offset, $Byte_Align );
-
- // Return the result
- return $packed_data;
- }
-
- /******************************************************************************
- * End of Function: get_TIFF_Packed_Data
- ******************************************************************************/
-
-
-
-
- /******************************************************************************
- *
- * Internal Function: get_IFD_Array_Packed_Data
- *
- * Description: Packs a chain of IFD's from EXIF or Meta segments into a form
- * ready for either a JPEG EXIF/Meta segment or a TIFF file
- *
- * Parameters: ifd_data - the IFD chain array, as read from get_EXIF_JPEG or get_Meta_JPEG
- * Zero_IFD_offset - The offset to the first IFD from the start of the TIFF header
- * Byte_Align - the Byte alignment to use - "MM" or "II"
- *
- * Returns: packed_data - A string containing packed IFD's
- *
- ******************************************************************************/
-
- function get_IFD_Array_Packed_Data( $ifd_data, $Zero_IFD_offset, $Byte_Align )
- {
- // Create a string to receive the packed output
- $packed_data = "";
-
- // Count the IFDs
- $ifd_count = 0;
- foreach( $ifd_data as $key => $IFD )
- {
- // Make sure we only count the IFD's, not other information keys
- if ( is_numeric( $key ) )
- {
- $ifd_count++;
- }
- }
-
-
- // Cycle through each IFD,
- for ( $ifdno = 0; $ifdno < $ifd_count; $ifdno++ )
- {
- // Check if this IFD is the last one
- if ( $ifdno == $ifd_count - 1 )
- {
- // This IFD is the last one, get it's packed data
- $packed_data .= get_IFD_Packed_Data( $ifd_data[ $ifdno ], $Zero_IFD_offset +strlen($packed_data), $Byte_Align, FALSE );
- }
- else
- {
- // This IFD is NOT the last one, get it's packed data
- $packed_data .= get_IFD_Packed_Data( $ifd_data[ $ifdno ], $Zero_IFD_offset +strlen($packed_data), $Byte_Align, TRUE );
- }
-
- }
-
- // Return the packed output
- return $packed_data;
- }
-
- /******************************************************************************
- * End of Function: get_IFD_Array_Packed_Data
- ******************************************************************************/
-
-
-
- /******************************************************************************
- *
- * Internal Function: get_IFD_Packed_Data
- *
- * Description: Packs an IFD from EXIF or Meta segments into a form
- * ready for either a JPEG EXIF/Meta segment or a TIFF file
- *
- * Parameters: ifd_data - the IFD chain array, as read from get_EXIF_JPEG or get_Meta_JPEG
- * IFD_offset - The offset to the IFD from the start of the TIFF header
- * Byte_Align - the Byte alignment to use - "MM" or "II"
- * Another_IFD - boolean - false if this is the last IFD in the chain
- * - true if it is not the last
- *
- * Returns: packed_data - A string containing packed IFD's
- *
- ******************************************************************************/
-
- function get_IFD_Packed_Data( $ifd_data, $IFD_offset, $Byte_Align, $Another_IFD )
- {
-
- $ifd_body_str = "";
- $ifd_data_str = "";
-
- $Tag_Definitions_Name = $ifd_data[ 'Tags Name' ];
-
-
- // Count the Tags in this IFD
- $tag_count = 0;
- foreach( $ifd_data as $key => $tag )
- {
- // Make sure we only count the Tags, not other information keys
- if ( is_numeric( $key ) )
- {
- $tag_count++;
- }
- }
-
- // Add the Tag count to the packed data
- $packed_data = put_IFD_Data_Type( $tag_count, 3, $Byte_Align );
-
- // Calculate the total length of the IFD (without the offset data)
- $IFD_len = 2 + $tag_count * 12 + 4;
-
-
- // Cycle through each tag
- foreach( $ifd_data as $key => $tag )
- {
- // Make sure this is a tag, not another information key
- if ( is_numeric( $key ) )
- {
-
- // Add the tag number to the packed data
- $ifd_body_str .= put_IFD_Data_Type( $tag[ 'Tag Number' ], 3, $Byte_Align );
-
- // Add the Data type to the packed data
- $ifd_body_str .= put_IFD_Data_Type( $tag['Data Type'], 3, $Byte_Align );
-
- // Check if this is a Print Image Matching entry
- if ( $tag['Type'] == "PIM" )
- {
- // This is a Print Image Matching entry,
- // encode it
- $data = Encode_PIM( $tag, $Byte_Align );
- }
- // Check if this is a IPTC/NAA Record within the EXIF IFD
- else if ( ( ( $Tag_Definitions_Name == "EXIF" ) || ( $Tag_Definitions_Name == "TIFF" ) ) &&
- ( $tag[ 'Tag Number' ] == 33723 ) )
- {
- // This is a IPTC/NAA Record, encode it
- $data = put_IPTC( $tag['Data'] );
- }
- // Change: Check for embedded XMP as of version 1.11
- // Check if this is a XMP Record within the EXIF IFD
- else if ( ( ( $Tag_Definitions_Name == "EXIF" ) || ( $Tag_Definitions_Name == "TIFF" ) ) &&
- ( $tag[ 'Tag Number' ] == 700 ) )
- {
- // This is a XMP Record, encode it
- $data = write_XMP_array_to_text( $tag['Data'] );
- }
- // Change: Check for embedded IRB as of version 1.11
- // Check if this is a Photoshop IRB Record within the EXIF IFD
- else if ( ( ( $Tag_Definitions_Name == "EXIF" ) || ( $Tag_Definitions_Name == "TIFF" ) ) &&
- ( $tag[ 'Tag Number' ] == 34377 ) )
- {
- // This is a Photoshop IRB Record, encode it
- $data = pack_Photoshop_IRB_Data( $tag['Data'] );
- }
- // Exif Thumbnail Offset
- else if ( ( $tag[ 'Tag Number' ] == 513 ) && ( $Tag_Definitions_Name == "TIFF" ) )
- {
- // The Exif Thumbnail Offset is a pointer but of type Long, not Unknown
- // Hence we need to put the data into the packed string separately
- // Calculate the thumbnail offset
- $data_offset = $IFD_offset + $IFD_len + strlen($ifd_data_str);
-
- // Create the Offset for the IFD
- $data = put_IFD_Data_Type( $data_offset, 4, $Byte_Align );
-
- // Store the thumbnail
- $ifd_data_str .= $tag['Data'];
- }
- // Exif Thumbnail Length
- else if ( ( $tag[ 'Tag Number' ] == 514 ) && ( $Tag_Definitions_Name == "TIFF" ) )
- {
- // Encode the Thumbnail Length
- $data = put_IFD_Data_Type( strlen($ifd_data[513]['Data']), 4, $Byte_Align );
- }
- // Sub-IFD
- else if ( $tag['Type'] == "SubIFD" )
- {
- // This is a Sub-IFD
- // Calculate the offset to the start of the Sub-IFD
- $data_offset = $IFD_offset + $IFD_len + strlen($ifd_data_str);
- // Get the packed data for the IFD chain as the data for this tag
- $data = get_IFD_Array_Packed_Data( $tag['Data'], $data_offset, $Byte_Align );
- }
- else
- {
- // Not a special tag
-
- // Create a string to receive the data
- $data = "";
-
- // Check if this is a type Unknown tag
- if ( $tag['Data Type'] != 7 )
- {
- // NOT type Unknown
- // Cycle through each data value and add it to the data string
- foreach( $tag[ 'Data' ] as $data_val )
- {
- $data .= put_IFD_Data_Type( $data_val, $tag['Data Type'], $Byte_Align );
- }
- }
- else
- {
- // This is a type Unknown - just add the data as is to the data string
- $data .= $tag[ 'Data' ];
- }
- }
-
- // Pad the data string out to at least 4 bytes
- $data = str_pad ( $data, 4, "\x00" );
-
-
- // Check if the data type is an ASCII String or type Unknown
- if ( ( $tag['Data Type'] == 2 ) || ( $tag['Data Type'] == 7 ) )
- {
- // This is an ASCII String or type Unknown
- // Add the Length of the string to the packed data as the Count
- $ifd_body_str .= put_IFD_Data_Type( strlen($data), 4, $Byte_Align );
- }
- else
- {
- // Add the array count to the packed data as the Count
- $ifd_body_str .= put_IFD_Data_Type( count($tag[ 'Data' ]), 4, $Byte_Align );
- }
-
-
- // Check if the data is over 4 bytes long
- if ( strlen( $data ) > 4 )
- {
- // Data is longer than 4 bytes - it needs to be offset
- // Check if this entry is the Maker Note
- if ( ( $Tag_Definitions_Name == "EXIF" ) && ( $tag[ 'Tag Number' ] == 37500 ) )
- {
- // This is the makernote - It will have already been stored
- // at its original offset to help preserve it
- // all we need to do is add the Offset to the IFD packed data
- $data_offset = $tag[ 'Offset' ];
-
- $ifd_body_str .= put_IFD_Data_Type( $data_offset, 4, $Byte_Align );
- }
- else
- {
- // This is NOT the makernote
- // Calculate the data offset
- $data_offset = $IFD_offset + $IFD_len + strlen($ifd_data_str);
-
- // Add the offset to the IFD packed data
- $ifd_body_str .= put_IFD_Data_Type( $data_offset, 4, $Byte_Align );
-
- // Add the data to the offset packed data
- $ifd_data_str .= $data;
- }
- }
- else
- {
- // Data is less than or equal to 4 bytes - Add it to the packed IFD data as is
- $ifd_body_str .= $data;
- }
-
- }
- }
-
- // Assemble the IFD body onto the packed data
- $packed_data .= $ifd_body_str;
-
- // Check if there is another IFD after this one
- if( $Another_IFD === TRUE )
- {
- // There is another IFD after this
- // Calculate the Next-IFD offset so that it goes immediately after this IFD
- $next_ifd_offset = $IFD_offset + $IFD_len + strlen($ifd_data_str);
- }
- else
- {
- // There is NO IFD after this - indicate with offset=0
- $next_ifd_offset = 0;
- }
-
- // Add the Next-IFD offset to the packed data
- $packed_data .= put_IFD_Data_Type( $next_ifd_offset, 4, $Byte_Align );
-
- // Add the offset data to the packed data
- $packed_data .= $ifd_data_str;
-
- // Return the resulting packed data
- return $packed_data;
- }
-
- /******************************************************************************
- * End of Function: get_IFD_Packed_Data
- ******************************************************************************/
-
-
-
-
-
- /******************************************************************************
- *
- * Internal Function: process_TIFF_Header
- *
- * Description: Decodes the information stored in a TIFF header and it's
- * Image File Directories (IFD's). This information is returned
- * in an array
- *
- * Parameters: filehnd - The handle of a open image file, positioned at the
- * start of the TIFF header
- * Tag_Definitions_Name - The name of the Tag Definitions group
- * within the global array IFD_Tag_Definitions
- *
- *
- * Returns: OutputArray - Array of IFD records
- * FALSE - If an error occured in decoding
- *
- ******************************************************************************/
-
- function process_TIFF_Header( $filehnd, $Tag_Definitions_Name )
- {
-
-
- // Save the file position where the TIFF header starts, as offsets are relative to this position
- $Tiff_start_pos = ftell( $filehnd );
-
-
-
- // Read the eight bytes of the TIFF header
- $DataStr = network_safe_fread( $filehnd, 8 );
-
- // Check that we did get all eight bytes
- if ( strlen( $DataStr ) != 8 )
- {
- return FALSE; // Couldn't read the TIFF header properly
- }
-
- $pos = 0;
- // First two bytes indicate the byte alignment - should be 'II' or 'MM'
- // II = Intel (LSB first, MSB last - Little Endian)
- // MM = Motorola (MSB first, LSB last - Big Endian)
- $Byte_Align = substr( $DataStr, $pos, 2 );
-
-
-
- // Check the Byte Align Characters for validity
- if ( ( $Byte_Align != "II" ) && ( $Byte_Align != "MM" ) )
- {
- // Byte align field is invalid - we won't be able to decode file
- return FALSE;
- }
-
- // Skip over the Byte Align field which was just read
- $pos += 2;
-
- // Next two bytes are TIFF ID - should be value 42 with the appropriate byte alignment
- $TIFF_ID = substr( $DataStr, $pos, 2 );
-
- if ( get_IFD_Data_Type( $TIFF_ID, 3, $Byte_Align ) != 42 )
- {
- // TIFF header ID not found
- return FALSE;
- }
-
- // Skip over the TIFF ID field which was just read
- $pos += 2;
-
-
- // Next four bytes are the offset to the first IFD
- $offset_str = substr( $DataStr, $pos, 4 );
- $offset = get_IFD_Data_Type( $offset_str, 4, $Byte_Align );
-
- // Done reading TIFF Header
-
-
- // Move to first IFD
-
- if ( fseek( $filehnd, $Tiff_start_pos + $offset ) !== 0 )
- {
- // Error seeking to position of first IFD
- return FALSE;
- }
-
-
-
- // Flag that a makernote has not been found yet
- $GLOBALS[ "Maker_Note_Tag" ] = FALSE;
-
- // Read the IFD chain into an array
- $Output_Array = read_Multiple_IFDs( $filehnd, $Tiff_start_pos, $Byte_Align, $Tag_Definitions_Name );
-
- // Check if a makernote was found
- if ( $GLOBALS[ "Maker_Note_Tag" ] != FALSE )
- {
- // Makernote was found - Process it
- // The makernote needs to be processed after all other
- // tags as it may require some of the other tags in order
- // to be processed properly
- $GLOBALS[ "Maker_Note_Tag" ] = Read_Makernote_Tag( $GLOBALS[ "Maker_Note_Tag" ], $Output_Array, $filehnd );
-
- }
-
- $Output_Array[ 'Makernote_Tag' ] = $GLOBALS[ "Maker_Note_Tag" ];
-
- // Save the Name of the Tags used in the output array
- $Output_Array[ 'Tags Name' ] = $Tag_Definitions_Name;
-
-
-
- // Save the Byte alignment
- $Output_Array['Byte_Align'] = $Byte_Align;
-
-
- // Return the output array
- return $Output_Array ;
- }
-
- /******************************************************************************
- * End of Function: process_TIFF_Header
- ******************************************************************************/
-
-
-
-
-
-
- /******************************************************************************
- *
- * Internal Function: read_Multiple_IFDs
- *
- * Description: Reads and interprets a chain of standard Image File Directories (IFD's),
- * and returns the entries in an array. This chain is made up from IFD's
- * which have a pointer to the next IFD. IFD's are read until the next
- * pointer indicates there are no more
- *
- * Parameters: filehnd - a handle for the image file being read, positioned at the
- * start of the IFD chain
- * Tiff_offset - The offset of the TIFF header from the start of the file
- * Byte_Align - either "MM" or "II" indicating Motorola or Intel Byte alignment
- * Tag_Definitions_Name - The name of the Tag Definitions group within the global array IFD_Tag_Definitions
- * local_offsets - True indicates that offset data should be interpreted as being relative to the start of the currrent entry
- * False (normal) indicates offests are relative to start of Tiff header as per IFD standard
- * read_next_ptr - True (normal) indicates that a pointer to the next IFD should be read at the end of the IFD
- * False indicates that no pointer follows the IFD
- *
- *
- * Returns: OutputArray - Array of IFD entries
- *
- ******************************************************************************/
-
- function read_Multiple_IFDs( $filehnd, $Tiff_offset, $Byte_Align, $Tag_Definitions_Name, $local_offsets = FALSE, $read_next_ptr = TRUE )
- {
- // Start at the offset of the first IFD
- $Next_Offset = 0;
-
- do
- {
- // Read an IFD
- list($IFD_Array , $Next_Offset) = read_IFD_universal( $filehnd, $Tiff_offset, $Byte_Align, $Tag_Definitions_Name, $local_offsets, $read_next_ptr );
-
- // Move to the position of the next IFD
- if ( fseek( $filehnd, $Tiff_offset + $Next_Offset ) !== 0 )
- {
- // Error seeking to position of next IFD
- echo "<p>Error: Corrupted EXIF</p>\n";
- return FALSE;
- }
-
- $Output_Array[] = $IFD_Array;
-
-
- } while ( $Next_Offset != 0 ); // Until the Next IFD Offset is zero
-
-
- // return resulting array
-
- return $Output_Array ;
- }
-
- /******************************************************************************
- * End of Function: read_Multiple_IFDs
- ******************************************************************************/
-
-
-
-
-
-
-
- /******************************************************************************
- *
- * Internal Function: read_IFD_universal
- *
- * Description: Reads and interprets a standard or Non-standard Image File
- * Directory (IFD), and returns the entries in an array
- *
- * Parameters: filehnd - a handle for the image file being read, positioned at the start
- * of the IFD
- * Tiff_offset - The offset of the TIFF header from the start of the file
- * Byte_Align - either "MM" or "II" indicating Motorola or Intel Byte alignment
- * Tag_Definitions_Name - The name of the Tag Definitions group within the global array IFD_Tag_Definitions
- * local_offsets - True indicates that offset data should be interpreted as being relative to the start of the currrent entry
- * False (normal) indicates offests are relative to start of Tiff header as per IFD standard
- * read_next_ptr - True (normal) indicates that a pointer to the next IFD should be read at the end of the IFD
- * False indicates that no pointer follows the IFD
- *
- * Returns: OutputArray - Array of IFD entries
- * Next_Offset - Offset to next IFD (zero = no next IFD)
- *
- ******************************************************************************/
-
- function read_IFD_universal( $filehnd, $Tiff_offset, $Byte_Align, $Tag_Definitions_Name, $local_offsets = FALSE, $read_next_ptr = TRUE )
- {
- if ( ( $filehnd == NULL ) || ( feof( $filehnd ) ) )
- {
- return array (FALSE , 0);
- }
-
- // Record the Name of the Tag Group used for this IFD in the output array
- $OutputArray[ 'Tags Name' ] = $Tag_Definitions_Name;
-
- // Record the offset of the TIFF header in the output array
- $OutputArray[ 'Tiff Offset' ] = $Tiff_offset;
-
- // First 2 bytes of IFD are number of entries in the IFD
- $No_Entries_str = network_safe_fread( $filehnd, 2 );
- $No_Entries = get_IFD_Data_Type( $No_Entries_str, 3, $Byte_Align );
-
-
- // If the data is corrupt, the number of entries may be huge, which will cause errors
- // This is often caused by a lack of a Next-IFD pointer
- if ( $No_Entries> 10000 )
- {
- // Huge number of entries - abort
- echo "<p>Error: huge number of EXIF entries - EXIF is probably Corrupted</p>\n";
-
- return array ( FALSE , 0);
- }
-
- // If the data is corrupt or just stupid, the number of entries may zero,
- // Indicate this by returning false
- if ( $No_Entries === 0 )
- {
- // No entries - abort
- return array ( FALSE , 0);
- }
-
- // Save the file position where first IFD record starts as non-standard offsets
- // need to know this to calculate an absolute offset
- $IFD_first_rec_pos = ftell( $filehnd );
-
-
- // Read in the IFD structure
- $IFD_Data = network_safe_fread( $filehnd, 12 * $No_Entries );
-
- // Check if the entire IFD was able to be read
- if ( strlen( $IFD_Data ) != (12 * $No_Entries) )
- {
- // Couldn't read the IFD Data properly, Some Casio files have no Next IFD pointer, hence cause this error
- echo "<p>Error: EXIF Corrupted</p>\n";
- return array(FALSE, 0);
- }
-
-
- // Last 4 bytes of a standard IFD are the offset to the next IFD
- // Some NON-Standard IFD implementations do not have this, hence causing problems if it is read
-
- // If the Next IFD pointer has been requested to be read,
- if ( $read_next_ptr )
- {
- // Read the pointer to the next IFD
-
- $Next_Offset_str = network_safe_fread( $filehnd, 4 );
- $Next_Offset = get_IFD_Data_Type( $Next_Offset_str, 4, $Byte_Align );
- }
- else
- {
- // Otherwise set the pointer to zero ( no next IFD )
- $Next_Offset = 0;
- }
-
-
-
- // Initialise current position to the start
- $pos = 0;
-
-
- // Loop for reading IFD entries
-
- for ( $i = 0; $i < $No_Entries; $i++ )
- {
- // First 2 bytes of IFD entry are the tag number ( Unsigned Short )
- $Tag_No_str = substr( $IFD_Data, $pos, 2 );
- $Tag_No = get_IFD_Data_Type( $Tag_No_str, 3, $Byte_Align );
- $pos += 2;
-
- // Next 2 bytes of IFD entry are the data format ( Unsigned Short )
- $Data_Type_str = substr( $IFD_Data, $pos, 2 );
- $Data_Type = get_IFD_Data_Type( $Data_Type_str, 3, $Byte_Align );
- $pos += 2;
-
- // If Datatype is not between 1 and 12, then skip this entry, it is probably corrupted or custom
- if (( $Data_Type > 12 ) || ( $Data_Type < 1 ) )
- {
- $pos += 8;
- continue 1; // Stop trying to process the tag any further and skip to the next one
- }
-
- // Next 4 bytes of IFD entry are the data count ( Unsigned Long )
- $Data_Count_str = substr( $IFD_Data, $pos, 4 );
- $Data_Count = get_IFD_Data_Type( $Data_Count_str, 4, $Byte_Align );
- $pos += 4;
-
- if ( $Data_Count > 100000 )
- {
- echo "<p>Error: huge EXIF data count - EXIF is probably Corrupted</p>\n";
-
- // Some Casio files have no Next IFD pointer, hence cause errors
-
- return array ( FALSE , 0);
- }
-
- // Total Data size is the Data Count multiplied by the size of the Data Type
- $Total_Data_Size = $GLOBALS['IFD_Data_Sizes'][ $Data_Type ] * $Data_Count;
-
- $Data_Start_pos = -1;
-
- // If the total data size is larger than 4 bytes, then the data part is the offset to the real data
- if ( $Total_Data_Size > 4 )
- {
- // Not enough room for data - offset provided instead
- $Data_Offset_str = substr( $IFD_Data, $pos, 4 );
- $Data_Start_pos = get_IFD_Data_Type( $Data_Offset_str, 4, $Byte_Align );
-
-
- // In some NON-STANDARD makernotes, the offset is relative to the start of the current IFD entry
- if ( $local_offsets )
- {
- // This is a NON-Standard IFD, seek relative to the start of the current tag
- fseek( $filehnd, $IFD_first_rec_pos + $pos - 8 + $Data_Start_pos );
- }
- else
- {
- // This is a normal IFD, seek relative to the start of the TIFF header
- fseek( $filehnd, $Tiff_offset + $Data_Start_pos );
- }
-
- // Read the data block from the offset position
- $DataStr = network_safe_fread( $filehnd, $Total_Data_Size );
- }
- else
- {
- // The data block is less than 4 bytes, and is provided in the IFD entry, so read it
- $DataStr = substr( $IFD_Data, $pos, $Total_Data_Size );
- }
-
- // Increment the position past the data
- $pos += 4;
-
-
- // Now create the entry for output array
-
- $Data_Array = array( );
-
-
- // Read the data items from the data block
-
- if ( ( $Data_Type != 2 ) && ( $Data_Type != 7 ) )
- {
- // The data type is Numerical, Read the data items from the data block
- for ( $j = 0; $j < $Data_Count; $j++ )
- {
- $Part_Data_Str = substr( $DataStr, $j * $GLOBALS['IFD_Data_Sizes'][ $Data_Type ], $GLOBALS['IFD_Data_Sizes'][ $Data_Type ] );
- $Data_Array[] = get_IFD_Data_Type( $Part_Data_Str, $Data_Type, $Byte_Align );
- }
- }
- elseif ( $Data_Type == 2 )
- {
- // The data type is String(s) (type 2)
-
- // Strip the last terminating Null
- $DataStr = substr( $DataStr, 0, strlen($DataStr)-1 );
-
- // Split the data block into multiple strings whereever there is a Null
- $Data_Array = explode( "\x00", $DataStr );
- }
- else
- {
- // The data type is Unknown (type 7)
- // Do nothing to data
- $Data_Array = $DataStr;
- }
-
-
- // If this is a Sub-IFD entry,
- if ( ( array_key_exists( $Tag_No, $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name] ) ) &&
- ( "SubIFD" == $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag_No ]['Type'] ) )
- {
- // This is a Sub-IFD entry, go and process the data forming Sub-IFD and use its output array as the new data for this entry
- fseek( $filehnd, $Tiff_offset + $Data_Array[0] );
- $Data_Array = read_Multiple_IFDs( $filehnd, $Tiff_offset, $Byte_Align, $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag_No ]['Tags Name'] );
- }
-
- $desc = "";
- $units = "";
-
- // Check if this tag exists in the list of tag definitions,
-
- if ( array_key_exists ( $Tag_No, $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name]) )
- {
-
- if ( array_key_exists ( 'Description', $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag_No ] ) )
- {
- $desc = $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag_No ]['Description'];
- }
-
- if ( array_key_exists ( 'Units', $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag_No ] ) )
- {
- $units = $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag_No ]['Units'];
- }
-
- // Tag exists in definitions, append details to output array
- $OutputArray[ $Tag_No ] = array ( "Tag Number" => $Tag_No,
- "Tag Name" => $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag_No ]['Name'],
- "Tag Description" => $desc,
- "Data Type" => $Data_Type,
- "Type" => $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag_No ]['Type'],
- "Units" => $units,
- "Data" => $Data_Array );
-
- }
- else
- {
- // Tag doesnt exist in definitions, append unknown details to output array
-
- $OutputArray[ $Tag_No ] = array ( "Tag Number" => $Tag_No,
- "Tag Name" => "Unknown Tag #" . $Tag_No,
- "Tag Description" => "",
- "Data Type" => $Data_Type,
- "Type" => "Unknown",
- "Units" => "",
- "Data" => $Data_Array );
- }
-
-
-
- // Some information of type "Unknown" (type 7) might require information about
- // how it's position and byte alignment in order to be decoded
- if ( $Data_Type == 7 )
- {
- $OutputArray[ $Tag_No ]['Offset'] = $Data_Start_pos;
- $OutputArray[ $Tag_No ]['Byte Align'] = $Byte_Align;
- }
-
-
- ////////////////////////////////////////////////////////////////////////
- // Special Data handling
- ////////////////////////////////////////////////////////////////////////
-
-
- // Check if this is a Print Image Matching entry
- if ( $OutputArray[ $Tag_No ]['Type'] == "PIM" )
- {
- // This is a Print Image Matching entry, decode it.
- $OutputArray[ $Tag_No ] = Decode_PIM( $OutputArray[ $Tag_No ], $Tag_Definitions_Name );
- }
-
-
- // Interpret the entry into a text string using a custom interpreter
- $text_val = get_Tag_Text_Value( $OutputArray[ $Tag_No ], $Tag_Definitions_Name );
-
- // Check if a text string was generated
- if ( $text_val !== FALSE )
- {
- // A string was generated, append it to the output array entry
- $OutputArray[ $Tag_No ]['Text Value'] = $text_val;
- $OutputArray[ $Tag_No ]['Decoded'] = TRUE;
- }
- else
- {
- // A string was NOT generated, append a generic string to the output array entry
- $OutputArray[ $Tag_No ]['Text Value'] = get_IFD_value_as_text( $OutputArray[ $Tag_No ] ) . " " . $units;
- $OutputArray[ $Tag_No ]['Decoded'] = FALSE;
- }
-
-
-
-
- // Check if this entry is the Maker Note
- if ( ( $Tag_Definitions_Name == "EXIF" ) && ( $Tag_No == 37500 ) )
- {
-
- // Save some extra information which will allow Makernote Decoding with the output array entry
- $OutputArray[ $Tag_No ]['Offset'] = $Data_Start_pos;
- $OutputArray[ $Tag_No ][ 'Tiff Offset' ] = $Tiff_offset;
- $OutputArray[ $Tag_No ]['ByteAlign'] = $Byte_Align;
-
- // Save a pointer to this entry for Maker note processing later
- $GLOBALS[ "Maker_Note_Tag" ] = & $OutputArray[ $Tag_No ];
- }
-
-
- // Check if this is a IPTC/NAA Record within the EXIF IFD
- if ( ( ( $Tag_Definitions_Name == "EXIF" ) || ( $Tag_Definitions_Name == "TIFF" ) ) &&
- ( $Tag_No == 33723 ) )
- {
- // This is a IPTC/NAA Record, interpret it and put result in the data for this entry
- $OutputArray[ $Tag_No ]['Data'] = get_IPTC( $DataStr );
- $OutputArray[ $Tag_No ]['Decoded'] = TRUE;
- }
- // Change: Check for embedded XMP as of version 1.11
- // Check if this is a XMP Record within the EXIF IFD
- if ( ( ( $Tag_Definitions_Name == "EXIF" ) || ( $Tag_Definitions_Name == "TIFF" ) ) &&
- ( $Tag_No == 700 ) )
- {
- // This is a XMP Record, interpret it and put result in the data for this entry
- $OutputArray[ $Tag_No ]['Data'] = read_XMP_array_from_text( $DataStr );
- $OutputArray[ $Tag_No ]['Decoded'] = TRUE;
- }
-
- // Change: Check for embedded IRB as of version 1.11
- // Check if this is a Photoshop IRB Record within the EXIF IFD
- if ( ( ( $Tag_Definitions_Name == "EXIF" ) || ( $Tag_Definitions_Name == "TIFF" ) ) &&
- ( $Tag_No == 34377 ) )
- {
- // This is a Photoshop IRB Record, interpret it and put result in the data for this entry
- $OutputArray[ $Tag_No ]['Data'] = unpack_Photoshop_IRB_Data( $DataStr );
- $OutputArray[ $Tag_No ]['Decoded'] = TRUE;
- }
-
- // Exif Thumbnail
- // Check that both the thumbnail length and offset entries have been processed,
- // and that this is one of them
- if ( ( ( ( $Tag_No == 513 ) && ( array_key_exists( 514, $OutputArray ) ) ) ||
- ( ( $Tag_No == 514 ) && ( array_key_exists( 513, $OutputArray ) ) ) ) &&
- ( $Tag_Definitions_Name == "TIFF" ) )
- {
- // Seek to the start of the thumbnail using the offset entry
- fseek( $filehnd, $Tiff_offset + $OutputArray[513]['Data'][0] );
-
- // Read the thumbnail data, and replace the offset data with the thumbnail
- $OutputArray[513]['Data'] = network_safe_fread( $filehnd, $OutputArray[514]['Data'][0] );
- }
-
-
- // Casio Thumbnail
- // Check that both the thumbnail length and offset entries have been processed,
- // and that this is one of them
- if ( ( ( ( $Tag_No == 0x0004 ) && ( array_key_exists( 0x0003, $OutputArray ) ) ) ||
- ( ( $Tag_No == 0x0003 ) && ( array_key_exists( 0x0004, $OutputArray ) ) ) ) &&
- ( $Tag_Definitions_Name == "Casio Type 2" ) )
- {
- // Seek to the start of the thumbnail using the offset entry
- fseek( $filehnd, $Tiff_offset + $OutputArray[0x0004]['Data'][0] );
-
- // Read the thumbnail data, and replace the offset data with the thumbnail
- $OutputArray[0x0004]['Data'] = network_safe_fread( $filehnd, $OutputArray[0x0003]['Data'][0] );
- }
-
- // Minolta Thumbnail
- // Check that both the thumbnail length and offset entries have been processed,
- // and that this is one of them
- if ( ( ( ( $Tag_No == 0x0088 ) && ( array_key_exists( 0x0089, $OutputArray ) ) ) ||
- ( ( $Tag_No == 0x0089 ) && ( array_key_exists( 0x0088, $OutputArray ) ) ) ) &&
- ( $Tag_Definitions_Name == "Olympus" ) )
- {
-
- // Seek to the start of the thumbnail using the offset entry
- fseek( $filehnd, $Tiff_offset + $OutputArray[0x0088]['Data'][0] );
-
- // Read the thumbnail data, and replace the offset data with the thumbnail
- $OutputArray[0x0088]['Data'] = network_safe_fread( $filehnd, $OutputArray[0x0089]['Data'][0] );
-
- // Sometimes the minolta thumbnail data is empty (or the offset is corrupt, which results in the same thing)
-
- // Check if the thumbnail data exists
- if ( $OutputArray[0x0088]['Data'] != "" )
- {
- // Thumbnail exists
-
- // Minolta Thumbnails are missing their first 0xFF for some reason,
- // which is replaced with some weird character, so fix this
- $OutputArray[0x0088]['Data']{0} = "\xFF";
- }
- else
- {
- // Thumbnail doesnt exist - make it obvious
- $OutputArray[0x0088]['Data'] = FALSE;
- }
- }
-
- }
-
-
-
-
-
-
-
- // Return the array of IFD entries and the offset to the next IFD
-
- return array ($OutputArray , $Next_Offset);
- }
-
-
-
- /******************************************************************************
- * End of Function: read_IFD_universal
- ******************************************************************************/
-
-
-
-
-
-
-
-
-
-
-
-
- /******************************************************************************
- *
- * Internal Function: get_Tag_Text_Value
- *
- * Description: Attempts to interpret an IFD entry into a text string using the
- * information in the IFD_Tag_Definitions global array.
- *
- * Parameters: Tag - The IFD entry to process
- * Tag_Definitions_Name - The name of the tag definitions to use from within the IFD_Tag_Definitions global array
- *
- * Returns: String - if the tag was successfully decoded into a text string
- * FALSE - if the tag could not be decoded using the information
- * in the IFD_Tag_Definitions global array
- *
- ******************************************************************************/
-
- function get_Tag_Text_Value( $Tag, $Tag_Definitions_Name )
- {
- // Check what format the entry is specified as
-
- if ( $Tag['Type'] == "String" )
- {
- // Format is Text String
-
- // If "Unknown" (type 7) data type,
- if ( $Tag['Data Type'] == 7 )
- {
- // Return data as is.
- return $Tag['Data'];
- }
- else
- {
- // Otherwise return the default string value of the datatype
- return get_IFD_value_as_text( $Tag );
- }
- }
- else if ( $Tag['Type'] == "Character Coded String" )
- {
- // Format is Character Coded String (First 8 characters indicate coding scheme)
-
- // Convert Data to a string
- if ( $Tag['Data Type'] == 7 )
- {
- // If it is type "Unknown" (type 7) use data as is
- $data = $Tag['Data'];
- }
- else
- {
- // Otherwise use the default string value of the datatype
- $data = get_IFD_value_as_text( $Tag );
- }
-
- // Some implementations allow completely data with no Coding Scheme Name,
- // so we need to handle this to avoid errors
- if ( trim( $data ) == "" )
- {
- return "";
- }
-
- // Extract the Coding Scheme Name from the first 8 characters
- $char_code = substr( $data, 0, 8 );
-
- // Extract the Data part from after the first 8 characters
- $characters = substr( $data, 8 );
-
- // Check coding scheme and interpret as neccessary
-
- if ( $char_code === "ASCII\x00\x00\x00" )
- {
- // ASCII coding - return data as is.
- return $characters;
- }
- elseif ( ( $char_code === "UNICODE\x00" ) ||
- ( $char_code === "Unicode\x00" ) ) // Note lowercase is non standard
- {
- // Unicode coding - interpret and return result.
- return xml_UTF16_clean( $characters, TRUE );
- }
- else
- {
- // Unknown coding - return string indicating this
- return "Unsupported character coding : \"$char_code\"\n\"" . trim($characters) . "\"";
- }
- break;
- }
- else if ( $Tag['Type'] == "Numeric" )
- {
- // Format is numeric - return default text value with any required units text appended
- if ( array_key_exists ( 'Units', $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag["Tag Number"] ] ) )
- {
- $units = $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag["Tag Number"] ]['Units'];
- }
- else
- {
- $units = "";
- }
- return get_IFD_value_as_text( $Tag ) . " " . $units;
- }
- else if ( $Tag['Type'] == "Lookup" )
- {
- // Format is a Lookup Table
-
- // Get a numeric value to use in lookup
-
- if ( is_array( $Tag['Data'] ) )
- {
- // If data is an array, use first element
- $first_val = $Tag['Data'][0];
- }
- else if ( is_string( $Tag['Data'] ) )
- {
- // If data is a string, use the first character
- $first_val = ord($Tag['Data']{0});
- }
- else
- {
- // Otherwise use the data as is
- $first_val = $Tag['Data'];
- }
-
- // Check if the data value exists in the lookup table for this IFD entry
- if ( array_key_exists( $first_val, $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag["Tag Number"] ] ) )
- {
- // Data value exists in lookup table - return the matching string
- return $GLOBALS[ "IFD_Tag_Definitions" ][$Tag_Definitions_Name][ $Tag["Tag Number"] ][ $first_val ];
- }
- else
- {
- // Data value doesnt exist in lookup table - return explanation string
- return "Unknown Reserved value $first_val ";
- }
- }
- else if ( $Tag['Type'] == "Special" )
- {
- // Format is special - interpret to text with special handlers
- return get_Special_Tag_Text_Value( $Tag, $Tag_Definitions_Name );
- }
- else if ( $Tag['Type'] == "PIM" )
- {
- // Format is Print Image Matching info - interpret with custom handler
- return get_PIM_Text_Value( $Tag, $Tag_Definitions_Name );
- }
- else if ( $Tag['Type'] == "SubIFD" )
- {
- // Format is a Sub-IFD - this has no text value
- return "";
- }
- else
- {
- // Unknown Format - Couldn't interpret using the IFD_Tag_Definitions global array information
- return FALSE;
- }
- }
-
- /******************************************************************************
- * End of Function: get_Tag_Text_Value
- ******************************************************************************/
-
-
-
-
-
-
- /******************************************************************************
- *
- * Internal Function: get_Special_Tag_Text_Value
- *
- * Description: Interprets an IFD entry marked as "Special" in the IFD_Tag_Definitions
- * global array into a text string using custom handlers
- *
- * Parameters: Tag - The IFD entry to process
- * Tag_Definitions_Name - The name of the tag definitions to use from within the IFD_Tag_Definitions global array
- *
- * Returns: String - if the tag was successfully decoded into a text string
- * FALSE - if the tag could not be decoded
- *
- ******************************************************************************/
-
- function get_Special_Tag_Text_Value( $Tag, $Tag_Definitions_Name )
- {
- // Check what type of IFD is being decoded
-
- if ( $Tag_Definitions_Name == "TIFF" )
- {
- // This is a TIFF IFD (bottom level)
-
- // Check what tag number the IFD entry has.
- switch ( $Tag['Tag Number'] )
- {
- case 530: // YCbCr Sub Sampling Entry
-
- // Data contains two numerical values
-
- if ( ( $Tag['Data'][0] == 2 ) && ( $Tag['Data'][1] == 1 ) )
- {
- // Values are 2,1 - hence YCbCr 4:2:2
- return "YCbCr 4:2:2 ratio of chrominance components to the luminance components";
- }
- elseif ( ( $Tag['Data'][0] == 2 ) && ( $Tag['Data'][1] == 2 ) )
- {
- // Values are 2,2 - hence YCbCr 4:2:0
- return "YCbCr 4:2:0 ratio of chrominance components to the luminance components";
- }
- else
- {
- // Other values are unknown
- return "Unknown Reserved value (" . $Tag['Data'][0] . ")";
- }
- break;
-
- default:
- return FALSE;
- }
- }
- else if ( $Tag_Definitions_Name == "EXIF" )
- {
- // This is an EXIF IFD
-
- // Check what tag number the IFD entry has.
- switch ( $Tag['Tag Number'] )
- {
-
- case 37121: // Components configuration
-
- // Data contains 4 numerical values indicating component type
-
- $output_str = "";
-
- // Cycle through each component
- for ( $Num = 0; $Num < 4; $Num++ )
- {
- // Construct first part of text string
- $output_str .= "Component " . ( $Num + 1 ) . ": ";
-
- // Construct second part of text string via
- // lookup using numerical value
-
- $value = ord( $Tag['Data']{$Num} );
- switch( $value )
- {
- case 0:
- $output_str .= "Does not exist\n";
- break;
- case 1:
- $output_str .= "Y (Luminance)\n";
- break;
- case 2:
- $output_str .= "Cb (Chroma minus Blue)\n";
- break;
- case 3:
- $output_str .= "Cr (Chroma minus Red)\n";
- break;
- case 4:
- $output_str .= "Red\n";
- break;
- case 5:
- $output_str .= "Green\n";
- break;
- case 6:
- $output_str .= "Blue\n";
- break;
- default:
- $output_str .= "Unknown value $value\n";
- };
- }
-
- // Return the completed string
-
- return $output_str;
- break;
-
-
-
- case 41730: // Colour Filter Array Pattern
-
- // The first two characters are a SHORT for Horizontal repeat pixel unit -
- $n_max = get_IFD_Data_Type( substr( $Tag['Data'], 0, 2 ), 3, $Tag['Byte Align'] );
-
- // The next two characters are a SHORT for Vertical repeat pixel unit -
- $m_max = get_IFD_Data_Type( substr( $Tag['Data'], 2, 2 ), 3, $Tag['Byte Align'] );
-
-
- // At least one camera type appears to have byte reversed values for N_Max and M_Max
- // Check if they need reversing
- if ( $n_max > 256 )
- {
- $n_max = $n_max/256 + 256*($n_max%256);
- }
-
- if ( $m_max > 256 )
- {
- $m_max = $m_max/256 + 256*($m_max%256);
- }
-
-
- $output_str = "";
-
-
- // Cycle through all the elements in the resulting 2 dimensional array,
- for( $m = 1; $m <= $m_max; $m++ )
- {
- for( $n = 1; $n <= $n_max; $n++ )
- {
-
- // Append text from a lookup table according to
- // the value read for this element
-
- switch ( ord($Tag['Data']{($n_max*($m-1)+$n+3)}) )
- {
- case 0:
- $output_str .= "RED ";
- break;
- case 1:
- $output_str .= "GREEN ";
- break;
- case 2:
- $output_str .= "BLUE ";
- break;
- case 3:
- $output_str .= "CYAN ";
- break;
- case 4:
- $output_str .= "MAGENTA ";
- break;
- case 5:
- $output_str .= "YELLOW ";
- break;
- case 6:
- $output_str .= "WHITE ";
- break;
- default:
- $output_str .= "Unknown ";
- break;
- };
- };
- $output_str .= "\n";
- };
-
- // Return the resulting string
- return $output_str;
- break;
-
- default:
- return FALSE;
- }
- }
- else
- {
- // Unknown IFD type, see if it is part of a makernote
- return get_Makernote_Text_Value( $Tag, $Tag_Definitions_Name );
- }
-
-
- }
-
- /******************************************************************************
- * End of Function: get_Tag_Text_Value
- ******************************************************************************/
-
-
-
-
-
-
-
-
- /******************************************************************************
- *
- * Function: interpret_IFD
- *
- * Description: Generates html detailing the contents a single IFD.
- *
- * Parameters: IFD_array - the array containing an IFD
- * filename - the name of the Image file being processed ( used
- * by scripts which displays EXIF thumbnails)
- *
- * Returns: output_str - A string containing the HTML
- *
- ******************************************************************************/
-
- function interpret_IFD( $IFD_array, $filename )
- {
- // Create the output string with the table tag
- $output_str = "<table class=\"EXIF_Table\" border=1>\n";
-
- // Create an extra output string to receive any supplementary html
- // which cannot go inside the table
- $extra_IFD_str = "";
-
- // Check that the IFD array is valid
- if ( ( $IFD_array === FALSE ) || ( $IFD_array === NULL ) )
- {
- // the IFD array is NOT valid - exit
- return "";
- }
-
- // Check if this is an EXIF IFD and if there is a makernote present
- if ( ( $IFD_array['Tags Name'] === "EXIF" ) &&
- ( ! array_key_exists( 37500, $IFD_array ) ) )
- {
-
- // This is an EXIF IFD but NO makernote is present - Add a message to the output
- $extra_IFD_str .= "<h3 class=\"EXIF_Secondary_Heading\">No Makernote Present</h3>";
- }
-
- // Cycle through each tag in the IFD
-
- foreach( $IFD_array as $Tag_ID => $Exif_Tag )
- {
-
- // Ignore the non numeric elements - they aren't tags
- if ( ! is_numeric ( $Tag_ID ) )
- {
- // Skip Tags Name
- }
- // Check if the Tag has been decoded successfully
- else if ( $Exif_Tag['Decoded'] == TRUE )
- {
- // This tag has been successfully decoded
-
- // Table cells won't get drawn with nothing in them -
- // Ensure that at least a non breaking space exists in them
-
- if ( trim($Exif_Tag['Text Value']) == "" )
- {
- $Exif_Tag['Text Value'] = " ";
- }
-
- // Check if the tag is a sub-IFD
- if ( $Exif_Tag['Type'] == "SubIFD" )
- {
- // This is a sub-IFD tag
- // Add a sub-heading for the sub-IFD
- $extra_IFD_str .= "<h3 class=\"EXIF_Secondary_Heading\">" . $Exif_Tag['Tag Name'] . " contents</h3>";
-
- // Cycle through each sub-IFD in the chain
- foreach ( $Exif_Tag['Data'] as $subIFD )
- {
- // Interpret this sub-IFD and add the html to the secondary output
- $extra_IFD_str .= interpret_IFD( $subIFD, $filename );
- }
- }
- // Check if the tag is a makernote
- else if ( $Exif_Tag['Type'] == "Maker Note" )
- {
- // This is a Makernote Tag
- // Add a sub-heading for the Makernote
- $extra_IFD_str .= "<h3 class=\"EXIF_Secondary_Heading\">Maker Note Contents</h3>";
-
- // Interpret the Makernote and add the html to the secondary output
- $extra_IFD_str .= Interpret_Makernote_to_HTML( $Exif_Tag, $filename );
- }
- // Check if this is a IPTC/NAA Record within the EXIF IFD
- else if ( $Exif_Tag['Type'] == "IPTC" )
- {
- // This is a IPTC/NAA Record, interpret it and output to the secondary html
- $extra_IFD_str .= "<h3 class=\"EXIF_Secondary_Heading\">Contains IPTC/NAA Embedded in EXIF</h3>";
- $extra_IFD_str .=Interpret_IPTC_to_HTML( $Exif_Tag['Data'] );
- }
- // Change: Check for embedded XMP as of version 1.11
- // Check if this is a XMP Record within the EXIF IFD
- else if ( $Exif_Tag['Type'] == "XMP" )
- {
- // This is a XMP Record, interpret it and output to the secondary html
- $extra_IFD_str .= "<h3 class=\"EXIF_Secondary_Heading\">Contains XMP Embedded in EXIF</h3>";
- $extra_IFD_str .= Interpret_XMP_to_HTML( $Exif_Tag['Data'] );
- }
- // Change: Check for embedded IRB as of version 1.11
- // Check if this is a Photoshop IRB Record within the EXIF IFD
- else if ( $Exif_Tag['Type'] == "IRB" )
- {
- // This is a Photoshop IRB Record, interpret it and output to the secondary html
- $extra_IFD_str .= "<h3 class=\"EXIF_Secondary_Heading\">Contains Photoshop IRB Embedded in EXIF</h3>";
- $extra_IFD_str .= Interpret_IRB_to_HTML( $Exif_Tag['Data'], $filename );
- }
- // Check if the tag is Numeric
- else if ( $Exif_Tag['Type'] == "Numeric" )
- {
- // Numeric Tag - Output text value as is.
- $output_str .= "<tr class=\"EXIF_Table_Row\"><td class=\"EXIF_Caption_Cell\">" . $Exif_Tag['Tag Name'] . "</td><td class=\"EXIF_Value_Cell\">" . $Exif_Tag['Text Value'] . "</td></tr>\n";
- }
- else
- {
- // Other tag - Output text as preformatted
- $output_str .= "<tr class=\"EXIF_Table_Row\"><td class=\"EXIF_Caption_Cell\">" . $Exif_Tag['Tag Name'] . "</td><td class=\"EXIF_Value_Cell\"><pre>" . trim( $Exif_Tag['Text Value']) . "</pre></td></tr>\n";
- }
-
- }
- else
- {
- // Tag has NOT been decoded successfully
- // Hence it is either an unknown tag, or one which
- // requires processing at the time of html construction
-
- // Table cells won't get drawn with nothing in them -
- // Ensure that at least a non breaking space exists in them
-
- if ( trim($Exif_Tag['Text Value']) == "" )
- {
- $Exif_Tag['Text Value'] = " ";
- }
-
- // Check if this tag is the first IFD Thumbnail
- if ( ( $IFD_array['Tags Name'] == "TIFF" ) &&
- ( $Tag_ID == 513 ) )
- {
- // This is the first IFD thumbnail - Add html to the output
-
- // Change: as of version 1.11 - Changed to make thumbnail link portable across directories
- // Build the path of the thumbnail script and its filename parameter to put in a url
- $link_str = get_relative_path( dirname(__FILE__) . "/get_exif_thumb.php" , getcwd ( ) );
- $link_str .= "?filename=";
- $link_str .= get_relative_path( $filename, dirname(__FILE__) );
-
- // Add thumbnail link to html
- $output_str .= "<tr class=\"EXIF_Table_Row\"><td class=\"EXIF_Caption_Cell\">" . $Exif_Tag['Tag Name'] . "</td><td class=\"EXIF_Value_Cell\"><a class=\"EXIF_First_IFD_Thumb_Link\" href=\"$link_str\"><img class=\"EXIF_First_IFD_Thumb\" src=\"$link_str\"></a></td></tr>\n";
- }
- // Check if this is the Makernote
- else if ( $Exif_Tag['Type'] == "Maker Note" )
- {
- // This is the makernote, but has not been decoded
- // Add a message to the secondary output
- $extra_IFD_str .= "<h3 class=\"EXIF_Secondary_Heading\">Makernote Coding Unknown</h3>\n";
- }
- else
- {
- // This is an Unknown Tag
-
- // Check if the user wants to hide unknown tags
- if ( $GLOBALS['HIDE_UNKNOWN_TAGS'] === FALSE )
- {
- // User wants to display unknown tags
-
- // Check if the Data is an ascii string
- if ( $Exif_Tag['Data Type'] == 2 )
- {
- // This is a Ascii String field - add it preformatted to the output
- $output_str .= "<tr class=\"EXIF_Table_Row\"><td class=\"EXIF_Caption_Cell\">" . $Exif_Tag['Tag Name'] . "</td><td class=\"EXIF_Value_Cell\"><pre>" . trim( $Exif_Tag['Text Value'] ) . "</pre></td></tr>\n";
- }
- else
- {
- // Not an ASCII string - add it as is to the output
- $output_str .= "<tr class=\"EXIF_Table_Row\"><td class=\"EXIF_Caption_Cell\">" . $Exif_Tag['Tag Name'] . "</td><td class=\"EXIF_Value_Cell\">" . trim( $Exif_Tag['Text Value'] ) . "</td></tr>\n";
- }
- }
- }
- }
- }
-
- // Close the table in the output
- $output_str .= "</table>\n";
-
- // Add the secondary output at the end of the main output
- $output_str .= "$extra_IFD_str\n";
-
- // Return the resulting html
- return $output_str;
- }
-
- /******************************************************************************
- * End of Function: interpret_IFD
- ******************************************************************************/
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- /******************************************************************************
- *
- * Function: get_IFD_Data_Type
- *
- * Description: Decodes an IFD field value from a binary data string, using
- * information supplied about the data type and byte alignment of
- * the stored data.
- * This function should be used for all datatypes except ASCII strings
- *
- * Parameters: input_data - a binary data string containing the IFD value,
- * must be exact length of the value
- * data_type - a number representing the IFD datatype as per the
- * TIFF 6.0 specification:
- * 1 = Unsigned 8-bit Byte
- * 2 = ASCII String
- * 3 = Unsigned 16-bit Short
- * 4 = Unsigned 32-bit Long
- * 5 = Unsigned 2x32-bit Rational
- * 6 = Signed 8-bit Byte
- * 7 = Undefined
- * 8 = Signed 16-bit Short
- * 9 = Signed 32-bit Long
- * 10 = Signed 2x32-bit Rational
- * 11 = 32-bit Float
- * 12 = 64-bit Double
- * Byte_Align - Indicates the byte alignment of the data.
- * MM = Motorola, MSB first, Big Endian
- * II = Intel, LSB first, Little Endian
- *
- * Returns: output - the value of the data (string or numeric)
- *
- ******************************************************************************/
-
- function get_IFD_Data_Type( $input_data, $data_type, $Byte_Align )
- {
- // Check if this is a Unsigned Byte, Unsigned Short or Unsigned Long
- if (( $data_type == 1 ) || ( $data_type == 3 ) || ( $data_type == 4 ))
- {
- // This is a Unsigned Byte, Unsigned Short or Unsigned Long
-
- // Check the byte alignment to see if the bytes need tp be reversed
- if ( $Byte_Align == "II" )
- {
- // This is in Intel format, reverse it
- $input_data = strrev ( $input_data );
- }
-
- // Convert the binary string to a number and return it
- return hexdec( bin2hex( $input_data ) );
- }
- // Check if this is a ASCII string type
- elseif ( $data_type == 2 )
- {
- // Null terminated ASCII string(s)
- // The input data may represent multiple strings, as the
- // 'count' field represents the total bytes, not the number of strings
- // Hence this should not be processed here, as it would have
- // to return multiple values instead of a single value
-
- echo "<p>Error - ASCII Strings should not be processed in get_IFD_Data_Type</p>\n";
- return "Error Should never get here"; //explode( "\x00", $input_data );
- }
- // Check if this is a Unsigned rational type
- elseif ( $data_type == 5 )
- {
- // This is a Unsigned rational type
-
- // Check the byte alignment to see if the bytes need to be reversed
- if ( $Byte_Align == "MM" )
- {
- // Motorola MSB first byte aligment
- // Unpack the Numerator and denominator and return them
- return unpack( 'NNumerator/NDenominator', $input_data );
- }
- else
- {
- // Intel LSB first byte aligment
- // Unpack the Numerator and denominator and return them
- return unpack( 'VNumerator/VDenominator', $input_data );
- }
- }
- // Check if this is a Signed Byte, Signed Short or Signed Long
- elseif ( ( $data_type == 6 ) || ( $data_type == 8 ) || ( $data_type == 9 ) )
- {
- // This is a Signed Byte, Signed Short or Signed Long
-
- // Check the byte alignment to see if the bytes need to be reversed
- if ( $Byte_Align == "II" )
- {
- //Intel format, reverse the bytes
- $input_data = strrev ( $input_data );
- }
-
- // Convert the binary string to an Unsigned number
- $value = hexdec( bin2hex( $input_data ) );
-
- // Convert to signed number
-
- // Check if it is a Byte above 128 (i.e. a negative number)
- if ( ( $data_type == 6 ) && ( $value > 128 ) )
- {
- // number should be negative - make it negative
- return $value - 256;
- }
-
- // Check if it is a Short above 32767 (i.e. a negative number)
- if ( ( $data_type == 8 ) && ( $value > 32767 ) )
- {
- // number should be negative - make it negative
- return $value - 65536;
- }
-
- // Check if it is a Long above 2147483648 (i.e. a negative number)
- if ( ( $data_type == 9 ) && ( $value > 2147483648 ) )
- {
- // number should be negative - make it negative
- return $value - 4294967296;
- }
-
- // Return the signed number
- return $value;
- }
- // Check if this is Undefined type
- elseif ( $data_type == 7 )
- {
- // Custom Data - Do nothing
- return $input_data;
- }
- // Check if this is a Signed Rational type
- elseif ( $data_type == 10 )
- {
- // This is a Signed Rational type
-
- // Signed Long not available with endian in unpack , use unsigned and convert
-
- // Check the byte alignment to see if the bytes need to be reversed
- if ( $Byte_Align == "MM" )
- {
- // Motorola MSB first byte aligment
- // Unpack the Numerator and denominator
- $value = unpack( 'NNumerator/NDenominator', $input_data );
- }
- else
- {
- // Intel LSB first byte aligment
- // Unpack the Numerator and denominator
- $value = unpack( 'VNumerator/VDenominator', $input_data );
- }
-
- // Convert the numerator to a signed number
- // Check if it is above 2147483648 (i.e. a negative number)
- if ( $value['Numerator'] > 2147483648 )
- {
- // number is negative
- $value['Numerator'] -= 4294967296;
- }
-
- // Convert the denominator to a signed number
- // Check if it is above 2147483648 (i.e. a negative number)
- if ( $value['Denominator'] > 2147483648 )
- {
- // number is negative
- $value['Denominator'] -= 4294967296;
- }
-
- // Return the Signed Rational value
- return $value;
- }
- // Check if this is a Float type
- elseif ( $data_type == 11 )
- {
- // IEEE 754 Float
- // TODO - EXIF - IFD datatype Float not implemented yet
- return "FLOAT NOT IMPLEMENTED YET";
- }
- // Check if this is a Double type
- elseif ( $data_type == 12 )
- {
- // IEEE 754 Double
- // TODO - EXIF - IFD datatype Double not implemented yet
- return "DOUBLE NOT IMPLEMENTED YET";
- }
- else
- {
- // Error - Invalid Datatype
- return "Invalid Datatype $data_type";
-
- }
-
- }
-
- /******************************************************************************
- * End of Function: get_IFD_Data_Type
- ******************************************************************************/
-
-
-
-
-
-
- /******************************************************************************
- *
- * Function: put_IFD_Data_Type
- *
- * Description: Encodes an IFD field from a value to a binary data string, using
- * information supplied about the data type and byte alignment of
- * the stored data.
- *
- * Parameters: input_data - an IFD data value, numeric or string
- * data_type - a number representing the IFD datatype as per the
- * TIFF 6.0 specification:
- * 1 = Unsigned 8-bit Byte
- * 2 = ASCII String
- * 3 = Unsigned 16-bit Short
- * 4 = Unsigned 32-bit Long
- * 5 = Unsigned 2x32-bit Rational
- * 6 = Signed 8-bit Byte
- * 7 = Undefined
- * 8 = Signed 16-bit Short
- * 9 = Signed 32-bit Long
- * 10 = Signed 2x32-bit Rational
- * 11 = 32-bit Float
- * 12 = 64-bit Double
- * Byte_Align - Indicates the byte alignment of the data.
- * MM = Motorola, MSB first, Big Endian
- * II = Intel, LSB first, Little Endian
- *
- * Returns: output - the packed binary string of the data
- *
- ******************************************************************************/
-
- function put_IFD_Data_Type( $input_data, $data_type, $Byte_Align )
- {
- // Process according to the datatype
- switch ( $data_type )
- {
- case 1: // Unsigned Byte - return character as is
- return chr($input_data);
- break;
-
- case 2: // ASCII String
- // Return the string with terminating null
- return $input_data . "\x00";
- break;
-
- case 3: // Unsigned Short
- // Check byte alignment
- if ( $Byte_Align == "II" )
- {
- // Intel/Little Endian - pack the short and return
- return pack( "v", $input_data );
- }
- else
- {
- // Motorola/Big Endian - pack the short and return
- return pack( "n", $input_data );
- }
- break;
-
- case 4: // Unsigned Long
- // Check byte alignment
- if ( $Byte_Align == "II" )
- {
- // Intel/Little Endian - pack the long and return
- return pack( "V", $input_data );
- }
- else
- {
- // Motorola/Big Endian - pack the long and return
- return pack( "N", $input_data );
- }
- break;
-
- case 5: // Unsigned Rational
- // Check byte alignment
- if ( $Byte_Align == "II" )
- {
- // Intel/Little Endian - pack the two longs and return
- return pack( "VV", $input_data['Numerator'], $input_data['Denominator'] );
- }
- else
- {
- // Motorola/Big Endian - pack the two longs and return
- return pack( "NN", $input_data['Numerator'], $input_data['Denominator'] );
- }
- break;
-
- case 6: // Signed Byte
- // Check if number is negative
- if ( $input_data < 0 )
- {
- // Number is negative - return signed character
- return chr( $input_data + 256 );
- }
- else
- {
- // Number is positive - return character
- return chr( $input_data );
- }
- break;
-
- case 7: // Unknown - return as is
- return $input_data;
- break;
-
- case 8: // Signed Short
- // Check if number is negative
- if ( $input_data < 0 )
- {
- // Number is negative - make signed value
- $input_data = $input_data + 65536;
- }
- // Check byte alignment
- if ( $Byte_Align == "II" )
- {
- // Intel/Little Endian - pack the short and return
- return pack( "v", $input_data );
- }
- else
- {
- // Motorola/Big Endian - pack the short and return
- return pack( "n", $input_data );
- }
- break;
-
- case 9: // Signed Long
- // Check if number is negative
- if ( $input_data < 0 )
- {
- // Number is negative - make signed value
- $input_data = $input_data + 4294967296;
- }
- // Check byte alignment
- if ( $Byte_Align == "II" )
- {
- // Intel/Little Endian - pack the long and return
- return pack( "v", $input_data );
- }
- else
- {
- // Motorola/Big Endian - pack the long and return
- return pack( "n", $input_data );
- }
- break;
-
- case 10: // Signed Rational
- // Check if numerator is negative
- if ( $input_data['Numerator'] < 0 )
- {
- // Number is numerator - make signed value
- $input_data['Numerator'] = $input_data['Numerator'] + 4294967296;
- }
- // Check if denominator is negative
- if ( $input_data['Denominator'] < 0 )
- {
- // Number is denominator - make signed value
- $input_data['Denominator'] = $input_data['Denominator'] + 4294967296;
- }
- // Check byte alignment
- if ( $Byte_Align == "II" )
- {
- // Intel/Little Endian - pack the two longs and return
- return pack( "VV", $input_data['Numerator'], $input_data['Denominator'] );
- }
- else
- {
- // Motorola/Big Endian - pack the two longs and return
- return pack( "NN", $input_data['Numerator'], $input_data['Denominator'] );
- }
- break;
-
- case 11: // Float
- // IEEE 754 Float
- // TODO - EXIF - IFD datatype Float not implemented yet
- return "FLOAT NOT IMPLEMENTED YET";
- break;
-
- case 12: // Double
- // IEEE 754 Double
- // TODO - EXIF - IFD datatype Double not implemented yet
- return "DOUBLE NOT IMPLEMENTED YET";
- break;
-
- default:
- // Error - Invalid Datatype
- return "Invalid Datatype $data_type";
- break;
-
- }
-
- // Shouldn't get here
- return FALSE;
- }
-
- /******************************************************************************
- * End of Function: put_IFD_Data_Type
- ******************************************************************************/
-
-
-
-
-
- /******************************************************************************
- *
- * Function: get_IFD_value_as_text
- *
- * Description: Decodes an IFD field value from a binary data string, using
- * information supplied about the data type and byte alignment of
- * the stored data.
- * This function should be used for all datatypes except ASCII strings
- *
- * Parameters: input_data - a binary data string containing the IFD value,
- * must be exact length of the value
- * data_type - a number representing the IFD datatype as per the
- * TIFF 6.0 specification:
- * 1 = Unsigned 8-bit Byte
- * 2 = ASCII String
- * 3 = Unsigned 16-bit Short
- * 4 = Unsigned 32-bit Long
- * 5 = Unsigned 2x32-bit Rational
- * 6 = Signed 8-bit Byte
- * 7 = Undefined
- * 8 = Signed 16-bit Short
- * 9 = Signed 32-bit Long
- * 10 = Signed 2x32-bit Rational
- * 11 = 32-bit Float
- * 12 = 64-bit Double
- * Byte_Align - Indicates the byte alignment of the data.
- * MM = Motorola, MSB first, Big Endian
- * II = Intel, LSB first, Little Endian
- *
- * Returns: output - the value of the data (string or numeric)
- *
- ******************************************************************************/
-
- function get_IFD_value_as_text( $Exif_Tag )
- {
- // Create a string to receive the output text
- $output_str = "";
-
- // Select Processing method according to the datatype
- switch ($Exif_Tag['Data Type'])
- {
- case 1 : // Unsigned Byte
- case 3 : // Unsigned Short
- case 4 : // Unsigned Long
- case 6 : // Signed Byte
- case 8 : // Signed Short
- case 9 : // Signed Long
-
- // Cycle through each of the values for this tag
- foreach ( $Exif_Tag['Data'] as $val )
- {
- // Check that this isn't the first value,
- if ( $output_str != "" )
- {
- // This isn't the first value, Add a Comma and Newline to the output
- $output_str .= ",\n";
- }
- // Add the Value to the output
- $output_str .= $val;
- }
- break;
-
- case 2 : // ASCII
- // Append all the strings together, separated by Newlines
- $output_str .= implode ( "\n", $Exif_Tag['Data']);
- break;
-
- case 5 : // Unsigned Rational
- case 10: // Signed Rational
-
- // Cycle through each of the values for this tag
- foreach ( $Exif_Tag['Data'] as $val )
- {
- // Check that this isn't the first value,
- if ( $output_str != "" )
- {
- // This isn't the first value, Add a Comma and Newline to the output
- $output_str .= ",\n";
- }
-
- // Add the Full Value to the output
- $output_str .= $val['Numerator'] ."/" . $val['Denominator'];
-
- // Check if division by zero might be a problem
- if ( $val['Denominator'] != 0 )
- {
- // Denominator is not zero, Add the Decimal Value to the output text
- $output_str .= " (" . ($val['Numerator'] / $val['Denominator']) . ")";
- }
- }
- break;
-
- case 11: // Float
- case 12: // Double
- // TODO - EXIF - IFD datatype Double and Float not implemented yet
- $output_str .= "Float and Double not implemented yet";
- break;
-
- case 7 : // Undefined
- // Unless the User has asked to see the raw binary data, this
- // type should not be displayed
-
- // Check if the user has requested to see the binary data in hex
- if ( $GLOBALS['SHOW_BINARY_DATA_HEX'] == TRUE)
- {
- // User has requested to see the binary data in hex
- // Add the value in hex
- $output_str .= "( " . strlen( $Exif_Tag['Data'] ) . " bytes of binary data ): " . bin2hex( $Exif_Tag['Data'] ) ;
- }
- // Check if the user has requested to see the binary data as is
- else if ( $GLOBALS['SHOW_BINARY_DATA_TEXT'] == TRUE)
- {
- // User has requested to see the binary data as is
- // Add the value as is
- $output_str .= "( " . strlen( $Exif_Tag['Data'] ) . " bytes of binary data ): " . $Exif_Tag['Data'] ;
- }
- else
- {
- // User has NOT requested to see binary data,
- // Add a message indicating the number of bytes to the output
- $output_str .= "( " . strlen( $Exif_Tag['Data'] ) . " bytes of binary data ) " ;
- }
- break;
-
- default :
- // Error - Unknown IFD datatype
- $output_str .= "Error - Exif tag data type (" . $Exif_Tag['Data Type'] .") is invalid";
- break;
- }
-
- // Return the resulting text string
- return $output_str;
- }
-
- /******************************************************************************
- * End of Function: get_IFD_value_as_text
- ******************************************************************************/
-
-
-
-
- /******************************************************************************
- * Global Variable: IFD_Data_Sizes
- *
- * Contents: The sizes (in bytes) of each EXIF IFD Datatype, indexed by
- * their datatype number
- *
- ******************************************************************************/
-
- $GLOBALS['IFD_Data_Sizes'] = array( 1 => 1, // Unsigned Byte
- 2 => 1, // ASCII String
- 3 => 2, // Unsigned Short
- 4 => 4, // Unsigned Long
- 5 => 8, // Unsigned Rational
- 6 => 1, // Signed Byte
- 7 => 1, // Undefined
- 8 => 2, // Signed Short
- 9 => 4, // Signed Long
- 10 => 8, // Signed Rational
- 11 => 4, // Float
- 12 => 8 ); // Double
-
- /******************************************************************************
- * End of Global Variable: IFD_Data_Sizes
- ******************************************************************************/
-
-
-
-
-
-
- ?>