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<?php
//$Id:
/**
*
* @author Raphael Schär
* This is a helper class to handle the whole data processing of exif
*
*/
Class Exif {
static private $instance = NULL;
/**
* We are implementing a singleton pattern
*/
private function __construct() {
}
public function getInstance() {
if(is_null(self::$instance)) {
self::$instance = new self;
}
return self::$instance;
}
/**
* Going through all the fields that have been created for a given node type
* and try to figure out which match the naming convention -> so that we know
* which exif information we have to read
*
* Naming convention are: field_exif_xxx (xxx would be the name of the exif
* tag to read
*
* @param $arCckFields array of CCK fields
* @return array a list of exif tags to read for this image
*/
public function getExifFields($arCckFields=array()) {
$arSections = array('exif', 'file', 'computed', 'ifd0', 'gps', 'winxp', 'iptc');
$arExif = array();
foreach ($arCckFields as $field) {
$ar = explode("_", $field['field_name']);
if ($ar[0] == 'field' && isset($ar[1]) && in_array($ar[1], $arSections)) {
unset($ar[0]);
$section = $ar[1];
unset($ar[1]);
$arExif[] = array('section'=>$section, 'tag'=>implode("_", $ar));
}
}
return $arExif;
}
/**
* Read the Information from a picture according to the fields specified in CCK
* @param $file
* @param $arTagNames
* @return array
*/
public function readExifTags($file, $arTagNames=array()) {
if (!file_exists($file)) {
return array();
}
$ar_supported_types = array('jpg', 'jpeg');
if (!in_array(strtolower($this->getFileType($file)), $ar_supported_types)) {
return array();
}
$exif = exif_read_data($file, 0);
$arSmallExif = array();
foreach ((array)$exif as $key => $value) {
$arSmallExif[strtolower($key)] = $value;
}
$info = array();
foreach ($arTagNames as $tagName) {
if ($tagName['section'] != 'iptc' && !empty($arSmallExif[$tagName['tag']])) {
$info[$tagName['section'] .'_'. $tagName['tag']] = $arSmallExif[$tagName['tag']];
}
}
return $info;
}
private function getFileType($file) {
$ar = explode('.', $file);
$ending = $ar[count($ar)-1];
return $ending;
}
public function readIPTCTags($file, $arTagNames=array()) {
$humanReadableKey = $this->getHumanReadableIPTCkey();
$size = GetImageSize ($file, $infoImage);
$iptc = empty($infoImage["APP13"]) ? array() : iptcparse($infoImage["APP13"]);
$arSmallIPTC = array();
if (is_array($iptc)) {
foreach($iptc as $key => $value)
{
$resultTag = "";
foreach($value as $innerkey => $innervalue)
{
if( ($innerkey+1) != count($value) ) {
$resultTag .= $innervalue . ", ";
}
else {
$resultTag .= $innervalue;
}
}
$arSmallIPTC[$humanReadableKey[$key]] = $resultTag;
}
}
$info = array();
foreach ($arTagNames as $tagName) {
if ($tagName['section'] == "iptc") {
$info[$tagName['section'] .'_'. $tagName['tag']] = $arSmallIPTC[$tagName['tag']];
}
}
return $info;
}
/**
* Just some little helper function to get the iptc fields
* @return array
*
*/
public function getHumanReadableIPTCkey() {
return array(
"2#202" => "object_data_preview_data",
"2#201" => "object_data_preview_file_format_version",
"2#200" => "object_data_preview_file_format",
"2#154" => "audio_outcue",
"2#153" => "audio_duration",
"2#152" => "audio_sampling_resolution",
"2#151" => "audio_sampling_rate",
"2#150" => "audio_type",
"2#135" => "language_identifier",
"2#131" => "image_orientation",
"2#130" => "image_type",
"2#125" => "rasterized_caption",
"2#122" => "writer",
"2#120" => "caption",
"2#118" => "contact",
"2#116" => "copyright_notice",
"2#115" => "source",
"2#110" => "credit",
"2#105" => "headline",
"2#103" => "original_transmission_reference",
"2#101" => "country_name",
"2#100" => "country_code",
"2#095" => "state",
"2#092" => "sublocation",
"2#090" => "city",
"2#085" => "by_line_title",
"2#080" => "by_line",
"2#075" => "object_cycle",
"2#070" => "program_version",
"2#065" => "originating_program",
"2#063" => "digital_creation_time",
"2#062" => "digital_creation_date",
"2#060" => "creation_time",
"2#055" => "creation_date",
"2#050" => "reference_number",
"2#047" => "reference_date",
"2#045" => "reference_service",
"2#042" => "action_advised",
"2#040" => "special_instruction",
"2#038" => "expiration_time",
"2#037" => "expiration_date",
"2#035" => "release_time",
"2#030" => "release_date",
"2#027" => "content_location_name",
"2#026" => "content_location_code",
"2#025" => "keywords",
"2#022" => "fixture_identifier",
"2#020" => "supplemental_category",
"2#015" => "category",
"2#010" => "subject_reference",
"2#010" => "urgency",
"2#008" => "editorial_update",
"2#007" => "edit_status",
"2#005" => "object_name",
"2#004" => "object_attribute_reference",
"2#003" => "object_type_reference",
"2#000" => "record_version"
);
}
}
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