<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.tag.xmp.php //
// module for analyzing XMP metadata (e.g. in JPEG files) //
// dependencies: NONE //
// //
/////////////////////////////////////////////////////////////////
// //
// Module originally written [2009-Mar-26] by //
// Nigel Barnes <ngbarnesØhotmail*com> //
// Bundled into getID3 with permission //
// called by getID3 in module.graphic.jpg.php //
// ///
/////////////////////////////////////////////////////////////////
/**************************************************************************************************
* SWISScenter Source Nigel Barnes
*
* Provides functions for reading information from the 'APP1' Extensible Metadata
* Platform (XMP) segment of JPEG format files.
* This XMP segment is XML based and contains the Resource Description Framework (RDF)
* data, which itself can contain the Dublin Core Metadata Initiative (DCMI) information.
*
* This code uses segments from the JPEG Metadata Toolkit project by Evan Hunter.
*************************************************************************************************/
class Image_XMP
{
/**
* @var string
* The name of the image file that contains the XMP fields to extract and modify.
* @see Image_XMP()
*/
var $_sFilename = null;
/**
* @var array
* The XMP fields that were extracted from the image or updated by this class.
* @see getAllTags()
*/
var $_aXMP = array();
/**
* @var boolean
* True if an APP1 segment was found to contain XMP metadata.
* @see isValid()
*/
var $_bXMPParse = false;
/**
* Returns the status of XMP parsing during instantiation
*
* You'll normally want to call this method before trying to get XMP fields.
*
* @return boolean
* Returns true if an APP1 segment was found to contain XMP metadata.
*/
function isValid()
{
return $this->_bXMPParse;
}
/**
* Get a copy of all XMP tags extracted from the image
*
* @return array - An array of XMP fields as it extracted by the XMPparse() function
*/
function getAllTags()
{
return $this->_aXMP;
}
/**
* Reads all the JPEG header segments from an JPEG image file into an array
*
* @param string $filename - the filename of the JPEG file to read
* @return array $headerdata - Array of JPEG header segments
* @return boolean FALSE - if headers could not be read
*/
function _get_jpeg_header_data($filename)
{
// prevent refresh from aborting file operations and hosing file
ignore_user_abort(true);
// Attempt to open the jpeg file - the at symbol supresses the error message about
// not being able to open files. The file_exists would have been used, but it
// does not work with files fetched over http or ftp.
if (is_readable($filename) && is_file($filename) && ($filehnd = fopen($filename, 'rb'))) {
// great
} else {
return false;
}
// Read the first two characters
$data = fread($filehnd, 2);
// Check that the first two characters are 0xFF 0xD8 (SOI - Start of image)
if ($data != "\xFF\xD8")
{
// No SOI (FF D8) at start of file - This probably isn't a JPEG file - close file and return;
echo '<p>This probably is not a JPEG file</p>'."\n";
fclose($filehnd);
return false;
}
// Read the third character
$data = fread($filehnd, 2);
// Check that the third character is 0xFF (Start of first segment header)
if ($data{0} != "\xFF")
{
// NO FF found - close file and return - JPEG is probably corrupted
fclose($filehnd);
return false;
}
// Flag that we havent yet hit the compressed image data
$hit_compressed_image_data = false;
// Cycle through the file until, one of: 1) an EOI (End of image) marker is hit,
// 2) we have hit the compressed image data (no more headers are allowed after data)
// 3) or end of file is hit
while (($data{1} != "\xD9") && (!$hit_compressed_image_data) && (!feof($filehnd)))
{
// Found a segment to look at.
// Check that the segment marker is not a Restart marker - restart markers don't have size or data after them
if ((ord($data{1}) < 0xD0) || (ord($data{1}) > 0xD7))
{
// Segment isn't a Restart marker
// Read the next two bytes (size)
$sizestr = fread($filehnd, 2);
// convert the size bytes to an integer
$decodedsize = unpack('nsize', $sizestr);
// Save the start position of the data
$segdatastart = ftell($filehnd);
// Read the segment data with length indicated by the previously read size
$segdata = fread($filehnd, $decodedsize['size'] - 2);
// Store the segment information in the output array
$headerdata[] = array(
'SegType' => ord($data{1}),
'SegName' => $GLOBALS['JPEG_Segment_Names'][ord($data{1})],
'SegDataStart' => $segdatastart,
'SegData' => $segdata,
);
}
// If this is a SOS (Start Of Scan) segment, then there is no more header data - the compressed image data follows
if ($data{1} == "\xDA")
{
// Flag that we have hit the compressed image data - exit loop as no more headers available.
$hit_compressed_image_data = true;
}
else
{
// Not an SOS - Read the next two bytes - should be the segment marker for the next segment
$data = fread($filehnd, 2);
// Check that the first byte of the two is 0xFF as it should be for a marker
if ($data{0} != "\xFF")
{
// NO FF found - close file and return - JPEG is probably corrupted
fclose($filehnd);
return false;
}
}
}
// Close File
fclose($filehnd);
// Alow the user to abort from now on
ignore_user_abort(false);
// Return the header data retrieved
return $headerdata;
}
/**
* Retrieves XMP information from an APP1 JPEG segment and returns the raw XML text as a string.
*
* @param string $filename - the filename of the JPEG file to read
* @return string $xmp_data - the string of raw XML text
* @return boolean FALSE - if an APP 1 XMP segment could not be found, or if an error occured
*/
function _get_XMP_text($filename)
{
//Get JPEG header data
$jpeg_header_data = $this->_get_jpeg_header_data($filename);
//Cycle through the header segments
for ($i = 0; $i < count($jpeg_header_data); $i++)
{
// If we find an APP1 header,
if (strcmp($jpeg_header_data[$i]['SegName'], 'APP1') == 0)
{
// And if it has the Adobe XMP/RDF label (http://ns.adobe.com/xap/1.0/\x00) ,
if (strncmp($jpeg_header_data[$i]['SegData'], 'http://ns.adobe.com/xap/1.0/'."\x00", 29) == 0)
{
// Found a XMP/RDF block
// Return the XMP text
$xmp_data = substr($jpeg_header_data[$i]['SegData'], 29);
return trim($xmp_data); // trim() should not be neccesary, but some files found in the wild with null-terminated block (known samples from Apple Aperture) causes problems elsewhere (see http://www.getid3.org/phpBB3/viewtopic.php?f=4&t=1153)
}
}
}
return false;
}
/**
* Parses a string containing XMP data (XML), and returns an array
* which contains all the XMP (XML) information.
*
* @param string $xml_text - a string containing the XMP data (XML) to be parsed
* @return array $xmp_array - an array containing all xmp details retrieved.
* @return boolean FALSE - couldn't parse the XMP data
*/
function read_XMP_array_from_text($xmltext)
{
// Check if there actually is any text to parse
if (trim($xmltext) == '')
{
return false;
}
// Create an instance of a xml parser to parse the XML text
$xml_parser = xml_parser_create('UTF-8');
// Change: Fixed problem that caused the whitespace (especially newlines) to be destroyed when converting xml text to an xml array, as of revision 1.10
// We would like to remove unneccessary white space, but this will also
// remove things like newlines (
) in the XML values, so white space
// will have to be removed later
if (xml_parser_set_option($xml_parser, XML_OPTION_SKIP_WHITE, 0) == false)
{
// Error setting case folding - destroy the parser and return
xml_parser_free($xml_parser);
return false;
}
// to use XML code correctly we have to turn case folding
// (uppercasing) off. XML is case sensitive and upper
// casing is in reality XML standards violation
if (xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, 0) == false)
{
// Error setting case folding - destroy the parser and return
xml_parser_free($xml_parser);
return false;
}
// Parse the XML text into a array structure
if (xml_parse_into_struct($xml_parser, $xmltext, $values, $tags) == 0)
{
// Error Parsing XML - destroy the parser and return
xml_parser_free($xml_parser);
return false;
}
// Destroy the xml parser
xml_parser_free($xml_parser);
// Clear the output array
$xmp_array = array();
// The XMP data has now been parsed into an array ...
// Cycle through each of the array elements
$current_property = ''; // current property being processed
$container_index = -1; // -1 = no container open, otherwise index of container content
foreach ($values as $xml_elem)
{
// Syntax and Class names
switch ($xml_elem['tag'])
{
case 'x:xmpmeta':
// only defined attribute is x:xmptk written by Adobe XMP Toolkit; value is the version of the toolkit
break;
case 'rdf:RDF':
// required element immediately within x:xmpmeta; no data here
break;
case 'rdf:Description':
switch ($xml_elem['type'])
{
case 'open':
case 'complete':
if (array_key_exists('attributes', $xml_elem))
{
// rdf:Description may contain wanted attributes
foreach (array_keys($xml_elem['attributes']) as $key)
{
// Check whether we want this details from this attribute
if (in_array($key, $GLOBALS['XMP_tag_captions']))
{
// Attribute wanted
$xmp_array[$key] = $xml_elem['attributes'][$key];
}
}
}
case 'cdata':
case 'close':
break;
}
case 'rdf:ID':
case 'rdf:nodeID':
// Attributes are ignored
break;
case 'rdf:li':
// Property member
if ($xml_elem['type'] == 'complete')
{
if (array_key_exists('attributes', $xml_elem))
{
// If Lang Alt (language alternatives) then ensure we take the default language
if (isset($xml_elem['attributes']['xml:lang']) && ($xml_elem['attributes']['xml:lang'] != 'x-default'))
{
break;
}
}
if ($current_property != '')
{
$xmp_array[$current_property][$container_index] = (isset($xml_elem['value']) ? $xml_elem['value'] : '');
$container_index += 1;
}
//else unidentified attribute!!
}
break;
case 'rdf:Seq':
case 'rdf:Bag':
case 'rdf:Alt':
// Container found
switch ($xml_elem['type'])
{
case 'open':
$container_index = 0;
break;
case 'close':
$container_index = -1;
break;
case 'cdata':
break;
}
break;
default:
// Check whether we want the details from this attribute
if (in_array($xml_elem['tag'], $GLOBALS['XMP_tag_captions']))
{
switch ($xml_elem['type'])
{
case 'open':
// open current element
$current_property = $xml_elem['tag'];
break;
case 'close':
// close current element
$current_property = '';
break;
case 'complete':
// store attribute value
$xmp_array[$xml_elem['tag']] = (isset($xml_elem['value']) ? $xml_elem['value'] : '');
break;
case 'cdata':
// ignore
break;
}
}
break;
}
}
return $xmp_array;
}
/**
* Constructor
*
* @param string - Name of the image file to access and extract XMP information from.
*/
function Image_XMP($sFilename)
{
$this->_sFilename = $sFilename;
if (is_file($this->_sFilename))
{
// Get XMP data
$xmp_data = $this->_get_XMP_text($sFilename);
if ($xmp_data)
{
$this->_aXMP = $this->read_XMP_array_from_text($xmp_data);
$this->_bXMPParse = true;
}
}
}
}
/**
* Global Variable: XMP_tag_captions
*
* The Property names of all known XMP fields.
* Note: this is a full list with unrequired properties commented out.
*/
$GLOBALS['XMP_tag_captions'] = array(
// IPTC Core
'Iptc4xmpCore:CiAdrCity',
'Iptc4xmpCore:CiAdrCtry',
'Iptc4xmpCore:CiAdrExtadr',
'Iptc4xmpCore:CiAdrPcode',
'Iptc4xmpCore:CiAdrRegion',
'Iptc4xmpCore:CiEmailWork',
'Iptc4xmpCore:CiTelWork',
'Iptc4xmpCore:CiUrlWork',
'Iptc4xmpCore:CountryCode',
'Iptc4xmpCore:CreatorContactInfo',
'Iptc4xmpCore:IntellectualGenre',
'Iptc4xmpCore:Location',
'Iptc4xmpCore:Scene',
'Iptc4xmpCore:SubjectCode',
// Dublin Core Schema
'dc:contributor',
'dc:coverage',
'dc:creator',
'dc:date',
'dc:description',
'dc:format',
'dc:identifier',
'dc:language',
'dc:publisher',
'dc:relation',
'dc:rights',
'dc:source',
'dc:subject',
'dc:title',
'dc:type',
// XMP Basic Schema
'xmp:Advisory',
'xmp:BaseURL',
'xmp:CreateDate',
'xmp:CreatorTool',
'xmp:Identifier',
'xmp:Label',
'xmp:MetadataDate',
'xmp:ModifyDate',
'xmp:Nickname',
'xmp:Rating',
'xmp:Thumbnails',
'xmpidq:Scheme',
// XMP Rights Management Schema
'xmpRights:Certificate',
'xmpRights:Marked',
'xmpRights:Owner',
'xmpRights:UsageTerms',
'xmpRights:WebStatement',
// These are not in spec but Photoshop CS seems to use them
'xap:Advisory',
'xap:BaseURL',
'xap:CreateDate',
'xap:CreatorTool',
'xap:Identifier',
'xap:MetadataDate',
'xap:ModifyDate',
'xap:Nickname',
'xap:Rating',
'xap:Thumbnails',
'xapidq:Scheme',
'xapRights:Certificate',
'xapRights:Copyright',
'xapRights:Marked',
'xapRights:Owner',
'xapRights:UsageTerms',
'xapRights:WebStatement',
// XMP Media Management Schema
'xapMM:DerivedFrom',
'xapMM:DocumentID',
'xapMM:History',
'xapMM:InstanceID',
'xapMM:ManagedFrom',
'xapMM:Manager',
'xapMM:ManageTo',
'xapMM:ManageUI',
'xapMM:ManagerVariant',
'xapMM:RenditionClass',
'xapMM:RenditionParams',
'xapMM:VersionID',
'xapMM:Versions',
'xapMM:LastURL',
'xapMM:RenditionOf',
'xapMM:SaveID',
// XMP Basic Job Ticket Schema
'xapBJ:JobRef',
// XMP Paged-Text Schema
'xmpTPg:MaxPageSize',
'xmpTPg:NPages',
'xmpTPg:Fonts',
'xmpTPg:Colorants',
'xmpTPg:PlateNames',
// Adobe PDF Schema
'pdf:Keywords',
'pdf:PDFVersion',
'pdf:Producer',
// Photoshop Schema
'photoshop:AuthorsPosition',
'photoshop:CaptionWriter',
'photoshop:Category',
'photoshop:City',
'photoshop:Country',
'photoshop:Credit',
'photoshop:DateCreated',
'photoshop:Headline',
'photoshop:History',
// Not in XMP spec
'photoshop:Instructions',
'photoshop:Source',
'photoshop:State',
'photoshop:SupplementalCategories',
'photoshop:TransmissionReference',
'photoshop:Urgency',
// EXIF Schemas
'tiff:ImageWidth',
'tiff:ImageLength',
'tiff:BitsPerSample',
'tiff:Compression',
'tiff:PhotometricInterpretation',
'tiff:Orientation',
'tiff:SamplesPerPixel',
'tiff:PlanarConfiguration',
'tiff:YCbCrSubSampling',
'tiff:YCbCrPositioning',
'tiff:XResolution',
'tiff:YResolution',
'tiff:ResolutionUnit',
'tiff:TransferFunction',
'tiff:WhitePoint',
'tiff:PrimaryChromaticities',
'tiff:YCbCrCoefficients',
'tiff:ReferenceBlackWhite',
'tiff:DateTime',
'tiff:ImageDescription',
'tiff:Make',
'tiff:Model',
'tiff:Software',
'tiff:Artist',
'tiff:Copyright',
'exif:ExifVersion',
'exif:FlashpixVersion',
'exif:ColorSpace',
'exif:ComponentsConfiguration',
'exif:CompressedBitsPerPixel',
'exif:PixelXDimension',
'exif:PixelYDimension',
'exif:MakerNote',
'exif:UserComment',
'exif:RelatedSoundFile',
'exif:DateTimeOriginal',
'exif:DateTimeDigitized',
'exif:ExposureTime',
'exif:FNumber',
'exif:ExposureProgram',
'exif:SpectralSensitivity',
'exif:ISOSpeedRatings',
'exif:OECF',
'exif:ShutterSpeedValue',
'exif:ApertureValue',
'exif:BrightnessValue',
'exif:ExposureBiasValue',
'exif:MaxApertureValue',
'exif:SubjectDistance',
'exif:MeteringMode',
'exif:LightSource',
'exif:Flash',
'exif:FocalLength',
'exif:SubjectArea',
'exif:FlashEnergy',
'exif:SpatialFrequencyResponse',
'exif:FocalPlaneXResolution',
'exif:FocalPlaneYResolution',
'exif:FocalPlaneResolutionUnit',
'exif:SubjectLocation',
'exif:SensingMethod',
'exif:FileSource',
'exif:SceneType',
'exif:CFAPattern',
'exif:CustomRendered',
'exif:ExposureMode',
'exif:WhiteBalance',
'exif:DigitalZoomRatio',
'exif:FocalLengthIn35mmFilm',
'exif:SceneCaptureType',
'exif:GainControl',
'exif:Contrast',
'exif:Saturation',
'exif:Sharpness',
'exif:DeviceSettingDescription',
'exif:SubjectDistanceRange',
'exif:ImageUniqueID',
'exif:GPSVersionID',
'exif:GPSLatitude',
'exif:GPSLongitude',
'exif:GPSAltitudeRef',
'exif:GPSAltitude',
'exif:GPSTimeStamp',
'exif:GPSSatellites',
'exif:GPSStatus',
'exif:GPSMeasureMode',
'exif:GPSDOP',
'exif:GPSSpeedRef',
'exif:GPSSpeed',
'exif:GPSTrackRef',
'exif:GPSTrack',
'exif:GPSImgDirectionRef',
'exif:GPSImgDirection',
'exif:GPSMapDatum',
'exif:GPSDestLatitude',
'exif:GPSDestLongitude',
'exif:GPSDestBearingRef',
'exif:GPSDestBearing',
'exif:GPSDestDistanceRef',
'exif:GPSDestDistance',
'exif:GPSProcessingMethod',
'exif:GPSAreaInformation',
'exif:GPSDifferential',
'stDim:w',
'stDim:h',
'stDim:unit',
'xapGImg:height',
'xapGImg:width',
'xapGImg:format',
'xapGImg:image',
'stEvt:action',
'stEvt:instanceID',
'stEvt:parameters',
'stEvt:softwareAgent',
'stEvt:when',
'stRef:instanceID',
'stRef:documentID',
'stRef:versionID',
'stRef:renditionClass',
'stRef:renditionParams',
'stRef:manager',
'stRef:managerVariant',
'stRef:manageTo',
'stRef:manageUI',
'stVer:comments',
'stVer:event',
'stVer:modifyDate',
'stVer:modifier',
'stVer:version',
'stJob:name',
'stJob:id',
'stJob:url',
// Exif Flash
'exif:Fired',
'exif:Return',
'exif:Mode',
'exif:Function',
'exif:RedEyeMode',
// Exif OECF/SFR
'exif:Columns',
'exif:Rows',
'exif:Names',
'exif:Values',
// Exif CFAPattern
'exif:Columns',
'exif:Rows',
'exif:Values',
// Exif DeviceSettings
'exif:Columns',
'exif:Rows',
'exif:Settings',
);
/**
* Global Variable: JPEG_Segment_Names
*
* The names of the JPEG segment markers, indexed by their marker number
*/
$GLOBALS['JPEG_Segment_Names'] = array(
0x01 => 'TEM',
0x02 => 'RES',
0xC0 => 'SOF0',
0xC1 => 'SOF1',
0xC2 => 'SOF2',
0xC3 => 'SOF4',
0xC4 => 'DHT',
0xC5 => 'SOF5',
0xC6 => 'SOF6',
0xC7 => 'SOF7',
0xC8 => 'JPG',
0xC9 => 'SOF9',
0xCA => 'SOF10',
0xCB => 'SOF11',
0xCC => 'DAC',
0xCD => 'SOF13',
0xCE => 'SOF14',
0xCF => 'SOF15',
0xD0 => 'RST0',
0xD1 => 'RST1',
0xD2 => 'RST2',
0xD3 => 'RST3',
0xD4 => 'RST4',
0xD5 => 'RST5',
0xD6 => 'RST6',
0xD7 => 'RST7',
0xD8 => 'SOI',
0xD9 => 'EOI',
0xDA => 'SOS',
0xDB => 'DQT',
0xDC => 'DNL',
0xDD => 'DRI',
0xDE => 'DHP',
0xDF => 'EXP',
0xE0 => 'APP0',
0xE1 => 'APP1',
0xE2 => 'APP2',
0xE3 => 'APP3',
0xE4 => 'APP4',
0xE5 => 'APP5',
0xE6 => 'APP6',
0xE7 => 'APP7',
0xE8 => 'APP8',
0xE9 => 'APP9',
0xEA => 'APP10',
0xEB => 'APP11',
0xEC => 'APP12',
0xED => 'APP13',
0xEE => 'APP14',
0xEF => 'APP15',
0xF0 => 'JPG0',
0xF1 => 'JPG1',
0xF2 => 'JPG2',
0xF3 => 'JPG3',
0xF4 => 'JPG4',
0xF5 => 'JPG5',
0xF6 => 'JPG6',
0xF7 => 'JPG7',
0xF8 => 'JPG8',
0xF9 => 'JPG9',
0xFA => 'JPG10',
0xFB => 'JPG11',
0xFC => 'JPG12',
0xFD => 'JPG13',
0xFE => 'COM',
);
?>
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