ricoh.php

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<?php

/******************************************************************************
*
* Filename:     ricoh.php
*
* Description:  Ricoh Makernote Parser
*               Provides functions to decode an Ricoh EXIF makernote and to interpret
*               the resulting array into html.
*
*               Ricoh Makernote Format:
*
*               Type 1 - Text Makernote
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               Text            Variable        Text, beginning with "Rv" or "Rev"
*               ---------------------------------------------------------------
*
*
*               Type 2 - Empty Makernote
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               Blank           Variable        Blank field filled with 0x00 characters
*               ---------------------------------------------------------------*
*
*
*               Type 3 - IFD Makernote
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               Header          5 Bytes        "Ricoh" or "RICOH"
*               Unknown         1 Byte          Unknown field
*               Zeros           2 Bytes         Two 0x00 characters
*               IFD Data        Variable        Standard IFD Data using Ricoh Tags
*                                               with Motorola byte alignment
*               ---------------------------------------------------------------
*
*               Within Makernote Type 3, Tag 0x2001 is the Ricoh Camera Info Sub-IFD
*               It has the following format:
*
*               Field           Size            Description
*               ----------------------------------------------------------------
*               Header          19 Bytes        "[Ricoh Camera Info]"
*               Unknown         1 Byte          Unknown field
*               IFD Data        Variable        NON-Standard IFD Data using Ricoh
*                                               Sub-IFD Tags with Motorola byte alignment
*                                               and has No final Next-IFD pointer
*               ---------------------------------------------------------------
*
*
*
*
* 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_Ricoh_Makernote";
$GLOBALS['Makernote_Function_Array']['get_Makernote_Text_Value'][] = "get_Ricoh_Text_Value";
$GLOBALS['Makernote_Function_Array']['Interpret_Makernote_to_HTML'][] = "get_Ricoh_Makernote_Html";




/******************************************************************************
*
* Function:     get_Ricoh_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_Ricoh_Makernote( $Makernote_Tag, $EXIF_Array, $filehnd, $Make_Field )
{
        // Check if the Make Field contains the word Ricoh
        if ( stristr( $Make_Field, "Ricoh" ) === FALSE )
        {
                // Ricoh not in the Maker field - abort
                return FALSE;
        }


        // Check if the Text Makernote header exists at the start of the Makernote
        if ( ( substr( $Makernote_Tag['Data'], 0, 2 ) === "Rv" ) ||
             ( substr( $Makernote_Tag['Data'], 0, 3 ) === "Rev" ) )
        {
                // This is a text makernote - Label it as such
                $Makernote_Tag['Makernote Type'] = "Ricoh Text";
                $Makernote_Tag['Makernote Tags'] = "None";
                $Makernote_Tag['Decoded'] = TRUE;

                // Return the new Makernote tag
                return $Makernote_Tag;

        }
        // Check if the Empty Makernote header exists at the start of the Makernote
        else if ( $Makernote_Tag['Data'] === str_repeat ( "\x00", strlen( $Makernote_Tag['Data'] )) )
        {
                // This is an Empty Makernote - Label it as such
                $Makernote_Tag['Makernote Type'] = "Ricoh Empty Makernote";
                $Makernote_Tag['Makernote Tags'] = "None";
                $Makernote_Tag['Decoded'] = TRUE;

                // Return the new Makernote tag
                return $Makernote_Tag;

        }
        // Check if the IFD Makernote header exists at the start of the Makernote
        else if ( ( substr( $Makernote_Tag['Data'], 0, 5 ) === "RICOH" ) ||
                  ( substr( $Makernote_Tag['Data'], 0, 5 ) === "Ricoh" ) )
        {
                //This is an IFD Makernote

                // Seek to the start of the IFD
                fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset'] + 8 );

                // Ricoh Makernote always uses Motorola Byte Alignment
                $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'], "Ricoh" );

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

                // Ricoh Makernotes can have a tag 0x2001 which is a Sub-IFD
                // Check if the tag exists
                if  ( ( $Makernote_Tag['Decoded Data'][0] !== FALSE ) &&
                      ( array_key_exists( 0x2001, $Makernote_Tag['Decoded Data'][0] ) ) )
                {
                        // Ricoh Sub-IFD tag exists - Process it

                        // Grab the Sub-IFD tag for easier processing
                        $SubIFD_Tag = &$Makernote_Tag['Decoded Data'][0][0x2001];

                        // Check if the Sub-IFD starts with the correct header
                        if ( substr( $SubIFD_Tag['Data'], 0, 19 ) === "[Ricoh Camera Info]" )
                        {
                                // Correct Header found

                                // Seek to the start of the Sub-IFD
                                fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $SubIFD_Tag['Offset'] + 20 );

                                // Ricoh Makernote Sub-IFD always uses Motorola Byte Alignment
                                $SubIFD_Tag['ByteAlign'] = "MM";


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

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

                                // Change the tag type to a Sub-IFD so it is handled automatically for interpretation
                                $SubIFD_Tag['Type'] = "SubIFD";
                                $SubIFD_Tag['Tags Name'] = "RicohSubIFD";

                        }
                        else
                        {
                                // Couldn't find header of Sub-IFD - Probably corrupt
                                $SubIFD_Tag['Type'] = "String";
                                $SubIFD_Tag['Text Value'] = "Corrupted Ricoh Sub IFD";
                        }

                }