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<?php
/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 2003-2004 TownNews.com                                 |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Patrick O'Lone <polone@townnews.com>                        |
// +----------------------------------------------------------------------+
//
// IPTC.php,v 1.5 2003/08/12 14:15:55 polone Exp

/**
* An abstraction layer for working with IPTC fields
*
* This class encapsulates the functions iptcparse() and iptcembed(). It provides
* the necessary methods for extracting, modifying, and saving IPTC data with
* image files (JPEG and TIFF files only).
*
* @author Patrick O'Lone <polone@townnews.com>
* @copyright 2003-2004 TownNews.com
* @version 1.5
*/
class Image_IPTC
{
    /**
    * @var string
    * The name of the image file that contains the IPTC fields to extract and
    * modify.
    * @see Image_IPTC()
    * @access private
    */
    var $_sFilename = null;

    /**
    * @var array
    * The IPTC fields that were extracted from the image or updated by this
    * class.
    * @see getAllTags(), getTag(), setTag()
    * @access private
    */
    var $_aIPTC = array();

    /**
    * @var boolean
    * The state of the getimagesize() function. If the parsing was successful,
    * this value will be set to true if the APP header data could be obtained.
    * @see isValid()
    * @access private
    */
    var $_bIPTCParse = false;

    /**
    * Constructor
    *
    * @param string
    * The name of the image file to access and extract IPTC information from.
    *
    * @access public
    */
    function Image_IPTC( $sFilename )
    {
        $this->_sFilename = $sFilename;

        if (is_file($this->_sFilename)) {

           if (@getimagesize($this->_sFilename, $aAPP) && !empty($aAPP)) {

               $this->_aIPTC = @iptcparse($aAPP['APP13']);
               $this->_bIPTCParse = true;

           }

        }

    }

    /**
    * Returns the status of IPTC parsing during instantiation
    *
    * You'll normally want to call this method before trying to change or
    * get IPTC fields.
    *
    * @return boolean
    * Returns true if the getimagesize() function successfully extracted APP
    * information from the supplied file
    *
    * @access public
    */
    function isValid()
    {
        return $this->_bIPTCParse;
    }

    /**
    * Set IPTC fields to a specific value or values
    *
    * @param mixed
    * The field (by number or string) of the IPTC data you wish to update
    *
    * @param mixed
    * If the value supplied is scalar, then the block assigned will be set to
    * the given value. If the value supplied is an array, then the entire tag
    * will be given the value of the array.
    *
    * @param integer
    * The block to update. Most tags only use the 0th block, but certain tags,
    * like the "keywords" tag, use a list of values. If set to a negative
    * value, the entire tag block will be replaced by the value of the second
    * parameter.
    *
    * @access public
    */
    function setTag( $xTag, $xValue, $nBlock = 0 )
    {
        $sTagName = $this->_lookupTag($xTag);

        if (($nBlock < 0) || is_array($xValue)) {

            $this->_aIPTC[$sTagName] = $xValue;

        } else {

            $this->_aIPTC[$sTagName][$nBlock] = $xValue;

        }
    }

    /**
    * Get a specific tag/block from the IPTC fields
    *
    * @return mixed
    * If the requested tag exists, a scalar value will be returned. If the block
    * is negative, the entire
    *
    * @param mixed
    * The tag name (by number or string) to access. For a list of possible string
    * values look at the _lookupTag() method.
    *
    * @param integer
    * The block to reference. Most fields only have one block (the 0th block),
    * but others, like the "keywords" block, are an array. If you want
    * to get the whole array, set this to a negative number like -1.
    *
    * @see _lookupTag()
    * @access public
    */
    function getTag( $xTag, $nBlock = 0 )
    {
        $sTagName = $this->_lookupTag($xTag);

        if (isset($this->_aIPTC[$sTagName]) && is_array($this->_aIPTC[$sTagName])) {

            if ($nBlock < 0) {

                return $this->_aIPTC[$sTagName];

            } else if (isset($this->_aIPTC[$sTagName][$nBlock])) {

                return $this->_aIPTC[$sTagName][$nBlock];

            }

        }

        return null;
    }

    /**
    * Get a copy of all IPTC tags extracted from the image
    *
    * @return array
    * An array of IPTC fields as it extracted by the iptcparse() function
    *
    * @access public
    */
    function getAllTags()
    {
        return $this->_aIPTC;
    }

    /**
    * Save the IPTC block to an image file
    *
    * @return boolean
    *
    * @param string
    * If supplied, the altered IPTC block and image data will be saved to another
    * file instead of the same file.
    *
    * @access public
    */
    function save( $sOutputFile = null )
    {
        if (empty($sOutputFile)) {

           $sOutputFile = $this->_sFilename;

        }

        $sIPTCBlock = $this->_getIPTCBlock();
        $sImageData = @iptcembed($sIPTCBlock, $this->_sFilename, 0);

        $hImageFile = @fopen($sOutputFile, 'wb');
        if (is_resource($hImageFile)) {

           flock($hImageFile, LOCK_EX);
           fwrite($hImageFile, $sImageData);
           flock($hImageFile, LOCK_UN);
           return fclose($hImageFile);

        }

        return false;
    }

    /**
    * Embed IPTC data block and output to standard output
    *
    * @access public
    */
    function output()
    {
        $sIPTCBlock = $this->_getIPTCBlock();
        @iptcembed($sIPTCBlock, $this->_sFilename, 2);
    }

    /**
    * Return the numeric code of an IPTC field name
    *
    * @return integer
    * Returns a numeric code corresponding to the name of the IPTC field that
    * was supplied.
    *
    * @param string
    * A field name representing the type of tag to return
    *
    * @access private
    */
    function _lookupTag( $sTag )
    {
        $nTag = -1;
        $sTag = strtolower(str_replace(' ','_',$sTag));

        switch($sTag) {

          case 'object_name':
             $nTag = 5;
             break;

          case 'edit_status':
             $nTag = 7;
             break;

          case 'priority':
             $nTag = 10;
             break;

          case 'category':
             $nTag = 15;
             break;

          case 'supplementary_category':
             $nTag = 20;
             break;

          case 'fixture_identifier':
             $nTag = 22;
             break;

          case 'keywords':
             $nTag = 25;
             break;

          case 'release_date':
             $nTag = 30;
             break;

          case 'release_time':
             $nTag = 35;
             break;

          case 'special_instructions':
             $nTag = 40;
             break;

          case 'reference_service':
             $nTag = 45;
             break;

          case 'reference_date':
             $nTag = 47;
             break;

          case 'reference_number':
             $nTag = 50;
             break;

          case 'created_date':
             $nTag = 55;
             break;

          case 'originating_program':
             $nTag = 64;
             break;

          case 'program_version':
             $nTag = 70;
             break;

          case 'object_cycle':
             $nTag = 75;
             break;

          case 'byline':
             $nTag = 80;
             break;

          case 'byline_title':
             $nTag = 85;
             break;

          case 'city':
             $nTag = 90;
             break;

          case 'province_state':
             $nTag = 95;
             break;

          case 'country_code':
             $nTag = 100;
             break;

          case 'country':
             $nTag = 101;
             break;

          case 'original_transmission_reference':
             $nTag = 103;
             break;

          case 'headline':
             $nTag = 105;
             break;

          case 'credit':
             $nTag = 110;
             break;

          case 'source':
             $nTag = 115;
             break;

          case 'copyright_string':
             $nTag = 116;
             break;

          case 'caption':
             $nTag = 120;
             break;

          case 'local_caption':
             $nTag = 121;
             break;

        }

        if ($nTag > 0) {

           return sprintf('2#%03d', $nTag);

        }

        return 0;
    }

    /**
    * Generate an IPTC block from the current tags
    *
    * @return string
    * Returns a binary string that contains the new IPTC block that can be used
    * in the iptcembed() function call
    *
    * @access private
    */
    function &_getIPTCBlock()
    {
        $sIPTCBlock = null;

        foreach($this->_aIPTC as $sTagID => $aTag) {

            $sTag = str_replace('2#', null, $sTagID);
            for($ci = 0; $ci < sizeof($aTag); $ci++) {

                $nLen = strlen($aTag[$ci]);

                // The below code is based on code contributed by Thies C. Arntzen
                // on the PHP website at the URL: http://www.php.net/iptcembed

                $sIPTCBlock .= pack('C*', 0x1C, 2, $sTag);

                if ($nLen < 32768) {

                    $sIPTCBlock .= pack('C*', $nLen >> 8, $nLen & 0xFF);

                } else {

                    $sIPTCBlock .= pack('C*', 0x80, 0x04);
                    $sIPTCBlock .= pack('C', $nLen >> 24 & 0xFF);
                    $sIPTCBlock .= pack('C', $nLen >> 16 & 0xFF);
                    $sIPTCBlock .= pack('C', $nLen >> 8 & 0xFF);
                    $sIPTCBlock .= pack('C', $nLen & 0xFF);

                }

                $sIPTCBlock .= $aTag[$ci];
            }
        }

        return $sIPTCBlock;
    }
}

?>
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