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Diffstat (limited to 'exif.class.php')
| -rw-r--r-- | exif.class.php | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/exif.class.php b/exif.class.php new file mode 100644 index 0000000..92c18fc --- /dev/null +++ b/exif.class.php @@ -0,0 +1,185 @@ +<?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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