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<?php
/******************************************************************************
*
* Filename: pentax.php
*
* Description: Pentax (Asahi) Makernote Parser
* Provides functions to decode an Pentax (Asahi) EXIF makernote and to interpret
* the resulting array into html.
*
* Pentax Makernote Format:
*
* Type 1
*
* Field Size Description
* ----------------------------------------------------------------
* IFD Data Variable NON-Standard IFD Data using Pentax Tags
* IFD has no Next-IFD pointer at end of IFD,
* and Offsets are relative to the start
* of the current IFD tag, not the TIFF header
* ----------------------------------------------------------------
*
*
* Type 2
*
* Field Size Description
* ----------------------------------------------------------------
* Header 4 Bytes "AOC\x00"
* Unknown 2 Bytes Unknown field
* IFD Data Variable NON-Standard IFD Data using Casio Type 2 Tags
* IFD has no Next-IFD pointer at end of IFD,
* and Offsets are relative to the start
* of the current IFD tag, not the TIFF header
* ----------------------------------------------------------------
*
*
*
* 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
*
******************************************************************************/
// Pentax Type 2 makernote uses Casio Type 2 tags - ensure they are included
include_once 'casio.php';
// Add the parser and interpreter functions to the list of Makernote parsers and interpreters.
$GLOBALS['Makernote_Function_Array']['Read_Makernote_Tag'][] = "get_Pentax_Makernote";
$GLOBALS['Makernote_Function_Array']['get_Makernote_Text_Value'][] = "get_Pentax_Text_Value";
$GLOBALS['Makernote_Function_Array']['Interpret_Makernote_to_HTML'][] = "get_Pentax_Makernote_Html";
/******************************************************************************
*
* Function: get_Pentax_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_Pentax_Makernote( $Makernote_Tag, $EXIF_Array, $filehnd, $Make_Field )
{
// Check if the Make Field contains the word Pentax or Asahi
if ( ( stristr( $Make_Field, "Pentax" ) === FALSE ) &&
( stristr( $Make_Field, "Asahi" ) === FALSE ) )
{
// Couldn't find Pentax or Asahi in the maker - abort
return FALSE;
}
// Check if the header exists at the start of the Makernote
if ( substr( $Makernote_Tag['Data'], 0, 4 ) == "AOC\x00" )
{
// Type 2 Pentax Makernote
// Seek to the start of the IFD
fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset'] + 6 );
// 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 $Makernote_Tag;
}
else
{
// Type 1 Penax Makernote
// Seek to the start of the IFD
fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset'] + 0 );
// Read the IFD(s) into an array
$Makernote_Tag['Decoded Data'] = read_Multiple_IFDs( $filehnd, $Makernote_Tag['Tiff Offset'], $Makernote_Tag['ByteAlign'], "Pentax" );
// Save some information into the Tag element to aid interpretation
$Makernote_Tag['Decoded'] = TRUE;
$Makernote_Tag['Makernote Type'] = "Pentax";
$Makernote_Tag['Makernote Tags'] = "Pentax";
// Return the new tag
return $Makernote_Tag;
}
// Shouldn't get here
return FALSE;
}
/******************************************************************************
* End of Function: get_Pentax_Makernote
******************************************************************************/
/******************************************************************************
*
* Function: get_Pentax_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_Pentax_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_Pentax_Text_Value( $Exif_Tag, $Tag_Definitions_Name )
{
// Check that this tag uses the Pentax tags, otherwise it can't be interpreted here
if ( $Tag_Definitions_Name == "Pentax" )
{
// No Special Tags so far
return FALSE;
}
return FALSE;
}
/******************************************************************************
* End of Function: get_Pentax_Text_Value
******************************************************************************/
/******************************************************************************
*
* Function: get_Pentax_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_Pentax_Makernote_Html( $Makernote_tag, $filename )
{
// Check that this is a Pentax type makernote
if ( $Makernote_tag['Makernote Type'] != "Pentax" )
{
// Not a Pentax makernote - abort
return False;
}
// Interpret the IFD and return the html
return interpret_IFD( $Makernote_tag['Decoded Data'][0], $filename );
}
/******************************************************************************
* End of Function: get_Pentax_Makernote_Html
******************************************************************************/
/******************************************************************************
* Global Variable: IFD_Tag_Definitions, Pentax
*
* Contents: This global variable provides definitions of the known Pentax Type 1
* Makernote tags, indexed by their tag number.
*
******************************************************************************/
$GLOBALS[ "IFD_Tag_Definitions" ]["Pentax"] = array(
0x0001 => array( 'Name' => "Capture Mode",
'Type' => "Lookup",
0 => "Auto",
1 => "Night-scene",
2 => "Manual",
4 => "Multiple" ),
0x0002 => array( 'Name' => "Quality Level",
'Type' => "Lookup",
0 => "Good",
1 => "Better",
2 => "Best" ),
0x0003 => array( 'Name' => "Focus Mode",
'Type' => "Lookup",
2 => "Custom",
3 => "Auto" ),
0x0004 => array( 'Name' => "Flash Mode",
'Type' => "Lookup",
1 => "Auto",
2 => "Flash on",
4 => "Flash off",
6 => "Red-eye Reduction" ),
0x0007 => array( 'Name' => "White Balance",
'Type' => "Lookup",
0 => "Auto",
1 => "Daylight",
2 => "Shade",
3 => "Tungsten",
4 => "Fluorescent",
5 => "Manual" ),
0x000a => array( 'Name' => "Digital Zoom",
'Type' => "Numeric",
'Units' => " (0 = Off)" ),
0x000b => array( 'Name' => "Sharpness",
'Type' => "Lookup",
0 => "Normal",
1 => "Soft",
2 => "Hard" ),
0x000c => array( 'Name' => "Contrast",
'Type' => "Lookup",
0 => "Normal",
1 => "Low",
2 => "High" ),
0x000d => array( 'Name' => "Saturation",
'Type' => "Lookup",
0 => "Normal",
1 => "Low",
2 => "High" ),
0x0014 => array( 'Name' => "ISO Speed",
'Type' => "Lookup",
10 => "100",
16 => "200",
100 => "100",
200 => "200" ),
0x0017 => array( 'Name' => "Colour",
'Type' => "Lookup",
1 => "Normal",
2 => "Black & White",
3 => "Sepia" ),
0x0e00 => array( 'Name' => "Print Image Matching Info",
'Type' => "PIM" ),
0x1000 => array( 'Name' => "Time Zone",
'Type' => "String" ),
0x1001 => array( 'Name' => "Daylight Savings",
'Type' => "String" ),
);
/******************************************************************************
* End of Global Variable: IFD_Tag_Definitions, Pentax
******************************************************************************/
?>
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