konica_minolta.php

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<?php

/******************************************************************************
*
* Filename:     konica_minolta.php
*
* Description:  Konica/Minolta Makernote Parser
*               Provides functions to decode an Konica/Minolta EXIF makernote and
*               to interpret the resulting array into html.
*
*               Konica/Minolta Makernote Formats:
*
*               Type 1:
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               Header          3 Bytes         "MLY"
*               Unknown Data    Variable        Unknown Data
*               ----------------------------------------------------------------
*
*               Type 2:
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               Header          2 Bytes         "KC"
*               Unknown Data    Variable        Unknown Data
*               ----------------------------------------------------------------
*
*               Type 3:
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               Header          8 Bytes         "+M+M+M+M"
*               Unknown Data    Variable        Unknown Data
*               ----------------------------------------------------------------
*
*               Type 4:
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               Header          5 Bytes         "MINOL"
*               Unknown Data    Variable        Unknown Data
*               ----------------------------------------------------------------
*
*               Type 5:   NO HEADER
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               IFD Data        Variable        Standard IFD with Olympus 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]
*
******************************************************************************/

// Konica/Minolta makernote uses Olympus tags - ensure they are included

include_once 'olympus.php';


// Add the parser functions to the list of Makernote parsers . (Interpreting done by Olympus script)

$GLOBALS['Makernote_Function_Array']['Read_Makernote_Tag'][] = "get_Minolta_Makernote";
$GLOBALS['Makernote_Function_Array']['get_Makernote_Text_Value'][] = "get_Minolta_Text_Value";



/******************************************************************************
*
* Function:     get_Minolta_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_Minolta_Makernote( $Makernote_Tag, $EXIF_Array, $filehnd, $Make_Field )
{

        if ( ( stristr( $Make_Field, "Konica" ) === FALSE ) &&
             ( stristr( $Make_Field, "Minolta" ) === FALSE ) )
        {
                // Not a Konica/Minolta Makernote - Cannot decode it
                return False;
        }

        // There are several different headers for a Konica/Minolta Makernote
        // Unfortunately only one type can be decoded (the one without a header)
        // Check which header exists (if any)
        if ( substr( $Makernote_Tag['Data'], 0, 3 ) == "MLY" )
        {
                // MLY Header - Can't Decode this
                return $Makernote_Tag;
        }
        else if ( substr( $Makernote_Tag['Data'], 0, 2 ) == "KC" )
        {
                // KC Header - Can't Decode this
                return $Makernote_Tag;
        }
        if ( substr( $Makernote_Tag['Data'], 0, 8 ) == "+M+M+M+M" )
        {
                // +M+M+M+M Header - Can't Decode this
                return $Makernote_Tag;
        }
        else if ( substr( $Makernote_Tag['Data'], 0, 5 ) == "MINOL" )
        {
                // MINOL Header - Can't Decode this
                return $Makernote_Tag;
        }
        else
        {
                // No Header - Decode the IFD

                // 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'], "Olympus" );

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


                // Return the new tag
                return $Makernote_Tag;

        }


        // Shouldn't get here
        return False;
}

/******************************************************************************
* End of Function:     get_Minolta_Makernote
******************************************************************************/







/******************************************************************************
*
* Function:     get_Minolta_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_Olympus_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_Minolta_Text_Value( $Exif_Tag, $Tag_Definitions_Name )
{
        // Check that this Tag uses Olympus type tags - otherwise it cannot be processed here
        if ( $Tag_Definitions_Name !== "Olympus" )
        {
                // Not Olympus Tags - cannot be processed here
                return FALSE;
        }


        // Process the tag acording to it's tag number, to produce a text value

        if ( ( $Exif_Tag['Tag Number'] == 0x0001 ) ||   // Minolta Camera Settings
             ( $Exif_Tag['Tag Number'] == 0x0003 ) )
        {

                // Create the output string
                $output_str = "";

                // Cycle through each camera setting record which are 4 byte Longs

                for ( $i = 1; $i*4 <= strlen( $Exif_Tag['Data'] ); $i++)
                {
                
                        // Exract the current 4 byte Long value (Motorola byte alignment)
                        $value = get_IFD_Data_Type( substr($Exif_Tag['Data'], ($i-1)*4, 4) , 4, "MM" );

                        // Corrupt settings can cause huge values, which automatically get
                        // put into floating point variables instead of integer variables
                        // Hence Check that this is an integer, as problems will occur if it isn't
                        if ( is_integer( $value ) )
                        {
                        
                                // Check if the current setting number is in the Definitions array
                                if ( array_key_exists( $i, ($GLOBALS[ "Minolta_Camera_Setting_Definitions" ]) ) === TRUE )
                                {
                                        // Setting is in definitions array

                                        // Get some of the information from the settings definitions array
                                        $tagname = $GLOBALS[ "Minolta_Camera_Setting_Definitions" ][ $i ][ 'Name' ];
                                        $units = "";
                                        if ( array_key_exists( 'Units', $GLOBALS[ "Minolta_Camera_Setting_Definitions" ][ $i ] ) )
                                        {
                                                $units = $GLOBALS[ "Minolta_Camera_Setting_Definitions" ][ $i ][ 'Units' ];
                                        }
                                        // Check what type of field the setting is, and process accordingly
                                        
                                        if ( $GLOBALS[ "Minolta_Camera_Setting_Definitions" ][ $i ]['Type'] == "Lookup" )
                                        {
                                                // This is a lookup table field

                                                // Check if the value read is in the lookup table