canon.php

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<?php

/******************************************************************************
*
* Filename:     canon.php
*
* Description:  Canon Makernote Parser
*               Provides functions to decode an Canon EXIF makernote and to interpret
*               the resulting array into html.
*
*               Canon Makernote Format:
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               IFD Data        Variable        Standard IFD Data using Canon Tags
*               ----------------------------------------------------------------
*
*
* Author:       Evan Hunter
*
* Date:         30/7/2004
*
* Project:      JPEG Metadata
*
* Revision:     1.00
*
* 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_Canon_Makernote";
$GLOBALS['Makernote_Function_Array']['get_Makernote_Text_Value'][] = "get_Canon_Text_Value";
$GLOBALS['Makernote_Function_Array']['Interpret_Makernote_to_HTML'][] = "get_Canon_Makernote_Html";







/******************************************************************************
*
* Function:     get_Canon_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_Canon_Makernote( $Makernote_Tag, $EXIF_Array, $filehnd, $Make_Field )
{
        // Check if the Make Field contains the word Canon
        if ( stristr( $Make_Field, "Canon" ) === FALSE )
        {
                // Canon not found in Make Field - can't process this
                return FALSE;
        }
        
        // Seek to the start of the IFD

        fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset']  );

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

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

        
        // Return the new tag
        return $Makernote_Tag;
}

/******************************************************************************
* End of Function:     get_Canon_Makernote
******************************************************************************/




/******************************************************************************
*
* Function:     get_Canon_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_Canon_Makernote_Html( $Makernote_tag, $filename )
{
        // Check that this makernote uses canon tags
        if ( $Makernote_tag['Makernote Type'] != "Canon" )
        {
                // Makernote doesn't use Canon tags - cant Interpret it
                return FALSE;
        }

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

}

/******************************************************************************
* End of Function:     get_Canon_Makernote_Html
******************************************************************************/





/******************************************************************************
*
* Function:     get_Canon_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_Canon_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_Canon_Text_Value( $Exif_Tag, $Tag_Definitions_Name )
{

        // Check that the tag uses Canon Definitions
        if ( $Tag_Definitions_Name != "Canon" )
        {
                // Tag doesn't use Canon definintions - can't process it
                return FALSE;
        }


        $Tag_ID = $Exif_Tag['Tag Number'];


        // Process the special tag according to the tag number
        switch ( $Tag_ID )
        {

                // CAMERA SETTINGS 1
                case 1:
                        // Create an output string
                        $output_str = "";

                        // Cycle through each of the camera settings Values
                        foreach( $Exif_Tag['Data'] as $offset => $value )
                        {
                                // Check that the value exists
                                if ( $value !== NULL )
                                {
                                        // Process the settings according to their offset
                                        if ( $offset == 0 )
                                        {
                                                // Do Not Show this Field ( Number of Bytes in Tag )
                                        }
                                        else if ( $offset == 2 )
                                        {
                                                if ( $value == 0 )
                                                {
                                                        $output_str .= "Self timer not used\n";
                                                }
                                                else
                                                {
                                                        $output_str .= "Self timer length : ". ($value/10) . " seconds\n";
                                                }
                                        }
                                        else if ( ( $offset == 23 ) && ( $Exif_Tag['Data'][25] != 0 ))
                                        {
                                                $output_str .= "Maximum Focal Length of Lens: " . ($value / $Exif_Tag['Data'][25]) . "mm\n";
                                        }
                                        else if ( ( $offset == 24 ) && ( $Exif_Tag['Data'][25] != 0 ))
                                        {
                                                $output_str .= "Minimum Focal Length of Lens: " . ($value / $Exif_Tag['Data'][25]) . "mm\n";
                                        }
                                        else if ( $offset == 25 )
                                        {
                                                // Do Not Show this Field ( Focal Length units per mm )
                                        }
                                        else if ( $offset == 29 )
                                        {
                                                if ( $value & 0x4000 == 0x4000 )
                                                {
                                                        $output_str .= "External E-TTL Flash\n";
                                                }
                                                if ( $value & 0x2000 == 0x2000 )
                                                {
                                                        $output_str .= "Internal Flash\n";
                                                }
                                                if ( $value & 0x0800 == 0x0800 )
                                                {
                                                        $output_str .= "Flash FP sync used\n";
                                                }
                                                if ( $value & 0x0080 == 0x0080 )
                                                {
                                                        $output_str .= "Second (Rear) curtain flash sync used\n";
                                                }
                                                if ( $value & 0x0008 == 0x0008 )
                                                {
                                                        $output_str .= "Flash FP sync enabled\n";
                                                }

                                        }
                                        else if ( array_key_exists( $offset, $GLOBALS[ "Canon_Camera_Settings_1_Tag_Values" ] ) )