casio.php

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<?php

/******************************************************************************
*
* Filename:     casio.php
*
* Description:  Casio Makernote Parser
*               Provides functions to decode an Casio EXIF makernote and to interpret
*               the resulting array into html.
*
*               Casio Makernote Format:
*
*               Type 1:
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               IFD Data        Variable        Standard IFD Data using Casio Type 1 Tags and Motorola Byte Alignment
*               ----------------------------------------------------------------
*
*               Type 2:
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               Header          6 Bytes         "QVC\x00\x00\x00"
*               IFD Data        Variable        Standard IFD Data using Casio Type 2 Tags and Motorola Byte Alignment
*               ----------------------------------------------------------------
*
*
* Author:       Evan Hunter
*
* Date:         30/7/2004
*
* Project:      JPEG Metadata
*
* Revision:     1.11
*
* Changes:      1.00 -> 1.11 : changed get_Casio_Makernote_Html to allow thumbnail links to work when
*                              toolkit is portable across directories
*
* URL:          http://electronics.ozhiker.com
*
* Copyright:    Copyright Evan Hunter 2004
*               This file may be used freely for non-commercial purposes.For
*               commercial uses please contact the author: [e-mail]
*
******************************************************************************/


// Add the parser and interpreter functions to the list of Makernote parsers and interpreters.

$GLOBALS['Makernote_Function_Array']['Read_Makernote_Tag'][] = "get_Casio_Makernote";
$GLOBALS['Makernote_Function_Array']['get_Makernote_Text_Value'][] = "get_Casio_Text_Value";
$GLOBALS['Makernote_Function_Array']['Interpret_Makernote_to_HTML'][] = "get_Casio_Makernote_Html";

include_once dirname(__FILE__) .'/../pjmt_utils.php';          // Change: as of version 1.11 - added to allow directory portability


/******************************************************************************
*
* Function:     get_Casio_Makernote
*
* Description:  Decodes the Makernote tag and returns the new tag with the decoded
*               information attached. Returns false if this is not a makernote
*               that can be processed with this script
*
* Parameters:   Makernote_Tag - the element of an EXIF array containing the
*                               makernote, as returned from get_EXIF_JPEG
*               EXIF_Array - the entire EXIF array containing the
*                            makernote, as returned from get_EXIF_JPEG, in
*                            case more information is required for decoding
*               filehnd - an open file handle for the file containing the
*                         makernote - does not have to be positioned at the
*                         start of the makernote
*               Make_Field - The contents of the EXIF Make field, to aid
*                            determining whether this script can decode
*                            the makernote
*
*
* Returns:      Makernote_Tag - the Makernote_Tag from the parameters, but
*                               modified to contain the decoded information
*               FALSE - If this script could not decode the makernote, or if
*                       an error occured in decoding
*
******************************************************************************/

function get_Casio_Makernote( $Makernote_Tag, $EXIF_Array, $filehnd, $Make_Field )
{

        // Check if the Make Field contains the word Casio
        if ( stristr( $Make_Field, "Casio" ) === FALSE )
        {
                return FALSE;
        }


        if ( substr( $Makernote_Tag['Data'],0 , 6 ) == "QVC\x00\x00\x00" )
        {

                // Seek to the start of the IFD
                fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset'] + 6 );

                $Makernote_Tag['ByteAlign'] = "MM";

                // Read the IFD(s) into an array
                $Makernote_Tag['Decoded Data'] = read_Multiple_IFDs( $filehnd, $Makernote_Tag['Tiff Offset'], $Makernote_Tag['ByteAlign'], "Casio Type 2" );

                // Save some information into the Tag element to aid interpretation
                $Makernote_Tag['Decoded'] = TRUE;
                $Makernote_Tag['Makernote Type'] = "Casio Type 2";
                $Makernote_Tag['Makernote Tags'] = "Casio Type 2";

                // Return the new tag
                return $Makernote_Tag;
        }
        else
        {
                // Seek to the start of the IFD
                fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset'] + 0 );

                $Makernote_Tag['ByteAlign'] = "MM";

                // Read the IFD(s) into an array
                $Makernote_Tag['Decoded Data'] = read_Multiple_IFDs( $filehnd, $Makernote_Tag['Tiff Offset'], $Makernote_Tag['ByteAlign'], "Casio Type 1" );

                // Save some information into the Tag element to aid interpretation
                $Makernote_Tag['Decoded'] = TRUE;
                $Makernote_Tag['Makernote Type'] = "Casio Type 1";
                $Makernote_Tag['Makernote Tags'] = "Casio Type 1";

                // Return the new tag
                return $Makernote_Tag;
        }
}

/******************************************************************************
* End of Function:     get_Casio_Makernote
******************************************************************************/




/******************************************************************************
*
* Function:     get_Casio_Text_Value
*
* Description:  Provides a text value for any tag marked as special for makernotes
*               that this script can decode. Returns false if this is not a makernote
*               that can be processed with this script
*
* Parameters:   Exif_Tag - the element of an the Makernote array containing the
*                          tag in question, as returned from get_Casio_Makernote
*               Tag_Definitions_Name - The name of the Tag Definitions group
*                                      within the global array IFD_Tag_Definitions
*
*
* Returns:      output - the text value for the tag
*               FALSE - If this script could not decode the makernote, or if
*                       an error occured in decoding
*
******************************************************************************/

function get_Casio_Text_Value( $Exif_Tag, $Tag_Definitions_Name )
{

        // Check that this tag uses the Casio tag definitions, otherwise it can't be decoded here
        if ( $Tag_Definitions_Name == "Casio Type 2" )
        {
                // Tag Uses Casio Type 2 Tag definitions
                // Process the tag according to it's tag number
                if ( $Exif_Tag['Tag Number'] == 0x001D )
                {
                        return  $Exif_Tag['Data'][0]/10 . $Exif_Tag['Units'];
                }
                else
                {
                        return FALSE;
                }
        }
        else if ( $Tag_Definitions_Name == "Casio Type 1" )
        {
                // Tag Uses Casio Type 1 Tags
                return FALSE;
        }
        else
        {
                // Tag does NOT use Casio Tag definitions
                return FALSE;
        }

        // Shouldn't get here
        return FALSE;

}

/******************************************************************************
* End of Function:     get_Casio_Text_Value
******************************************************************************/







/******************************************************************************
*
* Function:     get_Casio_Makernote_Html
*
* Description:  Attempts to interpret a makernote into html. Returns false if
*               it is not a makernote that can be processed with this script
*
* Parameters:   Makernote_Tag - the element of an EXIF array containing the
*                               makernote, as returned from get_EXIF_JPEG
*               filename - the name of the JPEG file being processed ( used
*                          by scripts which display embedded thumbnails)
*
*
* Returns:      output - the html representing the makernote
*               FALSE - If this script could not interpret the makernote, or if
*                       an error occured in decoding
*
******************************************************************************/

function get_Casio_Makernote_Html( $Makernote_tag, $filename )
{
        // Check that this tag uses the Casio tags, otherwise it can't be interpreted here
        if ( ( $Makernote_tag['Makernote Type'] != "Casio Type 1" ) &&
             ( $Makernote_tag['Makernote Type'] != "Casio Type 2" ) )
        {
                // Not Casio tags - can't interpret with this function
                return FALSE;
        }

        // Casio Thumbnail (Tag 4)
        if ( ( array_key_exists( 4, $Makernote_tag['Decoded Data'][0] ) ) &&
             ( $Makernote_tag['Makernote Tags'] == "Casio Type 2" ) )
        {
                // 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_casio_thumb.php" , getcwd ( ) );
                $link_str .= "?filename=";
                $link_str .= get_relative_path( $filename, dirname(__FILE__) );

                // Add thumbnail link to html
                $Makernote_tag['Decoded Data'][0][4]['Text Value'] = "<a class=\"EXIF_Casio_Thumb_Link\" href=\"$link_str\"><img class=\"EXIF_Casio_Thumb\" src=\"$link_str\"></a></td></tr>\n";
                $Makernote_tag['Decoded Data'][0][4]['Type'] = "String";
        }


        // Casio Thumbnail (Tag 8192)
        if ( ( array_key_exists( 8192, $Makernote_tag['Decoded Data'][0] ) ) &&
             ( $Makernote_tag['Makernote Tags'] == "Casio Type 2" ) )
        {
                // 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_casio_thumb.php" , getcwd ( ) );
                $link_str .= "?filename=";
                $link_str .= get_relative_path( $filename, dirname(__FILE__) . "/.." );

                // Add thumbnail link to html
                $Makernote_tag['Decoded Data'][0][8192]['Text Value'] = "<a class=\"EXIF_Casio_Thumb_Link\" href=\"$link_str\"><img class=\"EXIF_Casio_Thumb\" src=\"$link_str\"></a></td></tr>\n";
                $Makernote_tag['Decoded Data'][0][8192]['Type'] = "String";
        }


        // Check if there are two thumbnail offset tags
        if ( ( array_key_exists( 4, $Makernote_tag['Decoded Data'][0] ) ) &&
             ( array_key_exists( 8192, $Makernote_tag['Decoded Data'][0] ) ) )
        {
                // There are two copies of the thumbnail offset - Remove one
                array_splice( $Makernote_tag['Decoded Data'][0], 4, 1);
        }


        // Interpret the IFD and return the html
        return interpret_IFD( $Makernote_tag['Decoded Data'][0], $filename );

}

/******************************************************************************
* End of Function:     get_Casio_Makernote_Html
******************************************************************************/