293 lines
9.8 KiB
PHP
293 lines
9.8 KiB
PHP
<?php
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/******************************************************************************
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*
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* Filename: panasonic.php
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*
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* Description: Panasonic Makernote Parser
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* Provides functions to decode a Panasonic EXIF makernote and to interpret
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* the resulting array into html.
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*
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* Panasonic Makernote Format:
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*
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* Type 1 - IFD form
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*
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* Field Size Description
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* ----------------------------------------------------------------
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* Header 12 Bytes "Panasonic\x00\x00\x00"
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* IFD Data Variable NON-Standard IFD Data using Panasonic Tags
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* There is no Next-IFD pointer after the IFD
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* ----------------------------------------------------------------
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*
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* Type 2 - Blank (Header only)
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*
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* Field Size Description
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* ----------------------------------------------------------------
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* Header 4 Bytes "MKED"
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* Junk 1 or 2 bytes Blank or Junk data
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* ----------------------------------------------------------------
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*
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*
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* Author: Evan Hunter
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*
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* Date: 30/7/2004
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*
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* Project: JPEG Metadata
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*
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* Revision: 1.00
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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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* This file may be used freely for non-commercial purposes.For
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* commercial uses please contact the author: evan@ozhiker.com
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*
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******************************************************************************/
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// Add the parser and interpreter functions to the list of Makernote parsers and interpreters.
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$GLOBALS['Makernote_Function_Array']['Read_Makernote_Tag'][] = "get_Panasonic_Makernote";
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$GLOBALS['Makernote_Function_Array']['get_Makernote_Text_Value'][] = "get_Panasonic_Text_Value";
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$GLOBALS['Makernote_Function_Array']['Interpret_Makernote_to_HTML'][] = "get_Panasonic_Makernote_Html";
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/******************************************************************************
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*
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* Function: get_Panasonic_Makernote
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*
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* Description: Decodes the Makernote tag and returns the new tag with the decoded
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* information attached. Returns false if this is not a makernote
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* that can be processed with this script
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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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* Make_Field - The contents of the EXIF Make field, to aid
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* determining whether this script can decode
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* 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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* FALSE - If this script could not decode the makernote, 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_Panasonic_Makernote( $Makernote_Tag, $EXIF_Array, $filehnd, $Make_Field )
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{
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// Check if the Make Field contains the word Panasonic
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if ( stristr( $Make_Field, "Panasonic" ) === FALSE )
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{
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// No Panasonic in the maker - abort
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return FALSE;
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}
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// Check if the header exists at the start of the Makernote
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if ( substr( $Makernote_Tag['Data'], 0, 4 ) == "MKED" )
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{
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// Panasonic Type 2 - Empty Makernote
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// No Makernote Data
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$Makernote_Tag['Makernote Type'] = "Panasonic Empty Makernote";
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$Makernote_Tag['Makernote Tags'] = "-";
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$Makernote_Tag['Decoded'] = TRUE;
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// Return the new tag
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return $Makernote_Tag;
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}
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else if ( substr( $Makernote_Tag['Data'], 0, 12 ) == "Panasonic\x00\x00\x00" )
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{
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// Panasonic Type 1 - IFD Makernote
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// Seek to the start of the IFD
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fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset'] + 12 );
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// Read the IFD(s) into an array
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$Makernote_Tag['Decoded Data'] = read_Multiple_IFDs( $filehnd, $Makernote_Tag['Tiff Offset'], $Makernote_Tag['ByteAlign'], "Panasonic", FALSE, FALSE );
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// Save some information into the Tag element to aid interpretation
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$Makernote_Tag['Decoded'] = TRUE;
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$Makernote_Tag['Makernote Type'] = "Panasonic";
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$Makernote_Tag['Makernote Tags'] = "Panasonic";
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// Return the new tag
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return $Makernote_Tag;
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}
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else
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{
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// Unknown Header
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return FALSE;
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}
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// Shouldn't get here
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return FALSE;
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}
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/******************************************************************************
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* End of Function: get_Panasonic_Makernote
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******************************************************************************/
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/******************************************************************************
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*
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* Function: get_Panasonic_Text_Value
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*
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* Description: Provides a text value for any tag marked as special for makernotes
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* that this script can decode. Returns false if this is not a makernote
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* that can be processed with this script
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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 get_Panasonic_Makernote
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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 this script could not decode the makernote, 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_Panasonic_Text_Value( $Exif_Tag, $Tag_Definitions_Name )
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{
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// Check that this tag uses the Olympus tags, otherwise it can't be decoded here
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if ( $Tag_Definitions_Name == "Panasonic" )
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{
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// No Special Tags yet
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return FALSE;
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}
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return FALSE;
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}
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/******************************************************************************
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* End of Function: get_Panasonic_Text_Value
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******************************************************************************/
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/******************************************************************************
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*
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* Function: get_Panasonic_Makernote_Html
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*
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* Description: Attempts to interpret a makernote into html. Returns false if
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* it is not a makernote that can be processed with this script
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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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* FALSE - If this script could not interpret the makernote, 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_Panasonic_Makernote_Html( $Makernote_tag, $filename )
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{
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if ( $Makernote_tag['Makernote Type'] == "Panasonic" )
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{
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return interpret_IFD( $Makernote_tag['Decoded Data'][0], $filename );
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}
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else if ( $Makernote_tag['Makernote Type'] == "Panasonic Empty Makernote" )
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{
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// Do Nothing
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return "";
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}
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else
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{
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// Unknown Makernote Type
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return FALSE;
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}
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// Shouldn't get here
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return FALSE;
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}
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/******************************************************************************
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* End of Function: get_Panasonic_Makernote_Html
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******************************************************************************/
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/******************************************************************************
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* Global Variable: IFD_Tag_Definitions, Panasonic
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*
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* Contents: This global variable provides definitions of the known Panasonic
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* Makernote tags, indexed by their tag number.
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*
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******************************************************************************/
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$GLOBALS[ "IFD_Tag_Definitions" ]["Panasonic"] = array(
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0x01 => array( 'Name' => "Quality Mode",
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'Type' => "Numeric" ),
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0x02 => array( 'Name' => "Version",
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'Type' => "String" ),
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0x1c => array( 'Name' => "Macro Mode",
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'Type' => "Lookup",
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1 => "On",
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2 => "Off" ),
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0x1f => array( 'Name' => "Record Mode",
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'Type' => "Lookup",
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1 => "Normal",
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2 => "Portrait",
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9 => "Macro" ),
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0xE00 => array( 'Name' => "Print Image Matching Info",
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'Type' => "PIM" ),
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);
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/******************************************************************************
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* End of Global Variable: IFD_Tag_Definitions, Panasonic
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******************************************************************************/
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?>
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