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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: evan@ozhiker.com
*
******************************************************************************/
// 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";
}
}
// Return the new makernote tag
return $Makernote_Tag;
}
else
{
// Unrecognised header for makernote - abort
return FALSE;
}
// Shouldn't get here
return False;
}
/******************************************************************************
* End of Function: get_Ricoh_Makernote
******************************************************************************/
/******************************************************************************
*
* Function: get_Ricoh_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_Ricoh_Makernote_Html( $Makernote_tag, $filename )
{
// Check if this makernote is Ricoh IFD type
if ( $Makernote_tag['Makernote Type'] == "Ricoh" )
{
// This is a Ricoh IFD makernote - interpret it
return interpret_IFD( $Makernote_tag['Decoded Data'][0], $filename );
}
// Check if this makernote is Ricoh Text type
else if ( $Makernote_tag['Makernote Type'] == "Ricoh Text" )
{
// This is a Ricoh text makernote
// Construct the start of enclosing html for the text
$output_str = "<table class=\"EXIF_Table\"border=1><tr class=\"EXIF_Table_Row\"><td class=\"EXIF_Value_Cell\">";
// Replace the semicolon dividers with line break html tags
$output_str .= str_replace ( ";", "<BR>\n", $Makernote_tag['Data'] );
// Close the html
$output_str .= "</td></tr></table>";
// Return the html
return $output_str;
}
// Check if this makernote is a Ricoh Empty makernote
else if ( $Makernote_tag['Makernote Type'] == "Ricoh Empty Makernote" )
{
// Do Nothing
return "";
}
else
{
// Don't recognise the Makernote type - not a Ricoh makernote
return FALSE;
}
// shouldn't get here
return FALSE;
}
/******************************************************************************
* End of Function: get_Ricoh_Makernote_Html
******************************************************************************/
/******************************************************************************
*
* Function: get_Ricoh_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_Ricoh_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_Ricoh_Text_Value( $Exif_Tag, $Tag_Definitions_Name )
{
// Check that this tag uses the Ricoh tags, otherwise it can't be decoded here
if ( $Tag_Definitions_Name == "Ricoh" )
{
// Process the tag acording to it's tag number, to produce a text value
if ( $Exif_Tag['Tag Number'] == 0x0002 ) // Version tag
{
$tmp = implode ( "\x00", $Exif_Tag['Data']);
return "\"" .HTML_UTF8_Escape( $tmp ) . "\" (" . bin2hex( $tmp ) . " hex)";
}
}
// Unknown tag or tag definitions
return FALSE;
}
/******************************************************************************
* End of Function: get_Ricoh_Text_Value
******************************************************************************/
/******************************************************************************
* Global Variable: IFD_Tag_Definitions, Ricoh
*
* Contents: This global variable provides definitions of the known Ricoh
* Makernote tags, indexed by their tag number.
*
******************************************************************************/
$GLOBALS[ "IFD_Tag_Definitions" ]["Ricoh"] = array(
0x0001 => array( 'Name' => "Makernote Data Type",
'Type' => "String" ),
0x0002 => array( 'Name' => "Version",
'Type' => "Special" ),
0x0e00 => array( 'Name' => "Print Image Matching Info",
'Type' => "PIM" ),
0x2001 => array( 'Name' => "Ricoh Camera Info Makernote Sub-IFD",
'Type' => "Special" ),
);
/******************************************************************************
* End of Global Variable: IFD_Tag_Definitions, Ricoh
******************************************************************************/
/******************************************************************************
* Global Variable: IFD_Tag_Definitions, RicohSubIFD
*
* Contents: This global variable provides definitions of the known Ricoh
* Camera Info Sub-IFD Makernote tags, indexed by their tag number.
*
******************************************************************************/
$GLOBALS[ "IFD_Tag_Definitions" ]["RicohSubIFD"] = array(
);
/******************************************************************************
* End of Global Variable: IFD_Tag_Definitions, RicohSubIFD
******************************************************************************/
?>
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