From 96d54bf6955d8e9711a50646473620182d442d76 Mon Sep 17 00:00:00 2001
From: Silvio <s1lv10@uol.com.br>
Date: Fri, 23 Apr 2010 17:23:54 -0300
Subject: Initial import from upstream release

---
 exif.class.php | 185 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 185 insertions(+)
 create mode 100644 exif.class.php

(limited to 'exif.class.php')

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"
+      );
+  }
+}
\ No newline at end of file
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