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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Pdf
  * @subpackage Images
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * Abstract factory class which vends {@link Zend_Pdf_Resource_Image} objects.
  *
  * This class is also the home for image-related constants because the name of
  * the true base class ({@link Zend_Pdf_Resource_Image}) is not intuitive for the
  * end user.
  *
  * @package    Zend_Pdf
  * @subpackage Images
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 abstract class Zend_Pdf_Image
 {
   /**** Class Constants ****/
 
 
   /* Image Types */
 
     const TYPE_UNKNOWN = 0;
     const TYPE_JPEG = 1;
     const TYPE_PNG = 2;
     const TYPE_TIFF = 3;
 
   /* TIFF Constants */
 
     const TIFF_FIELD_TYPE_BYTE=1;
     const TIFF_FIELD_TYPE_ASCII=2;
     const TIFF_FIELD_TYPE_SHORT=3;
     const TIFF_FIELD_TYPE_LONG=4;
     const TIFF_FIELD_TYPE_RATIONAL=5;
 
     const TIFF_TAG_IMAGE_WIDTH=256;
     const TIFF_TAG_IMAGE_LENGTH=257; //Height
     const TIFF_TAG_BITS_PER_SAMPLE=258;
     const TIFF_TAG_COMPRESSION=259;
     const TIFF_TAG_PHOTOMETRIC_INTERPRETATION=262;
     const TIFF_TAG_STRIP_OFFSETS=273;
     const TIFF_TAG_SAMPLES_PER_PIXEL=277;
     const TIFF_TAG_STRIP_BYTE_COUNTS=279;
 
     const TIFF_COMPRESSION_UNCOMPRESSED = 1;
     const TIFF_COMPRESSION_CCITT1D = 2;
     const TIFF_COMPRESSION_GROUP_3_FAX = 3;
     const TIFF_COMPRESSION_GROUP_4_FAX  = 4;
     const TIFF_COMPRESSION_LZW = 5;
     const TIFF_COMPRESSION_JPEG = 6;
     const TIFF_COMPRESSION_FLATE = 8;
     const TIFF_COMPRESSION_FLATE_OBSOLETE_CODE = 32946;
     const TIFF_COMPRESSION_PACKBITS = 32773;
 
     const TIFF_PHOTOMETRIC_INTERPRETATION_WHITE_IS_ZERO=0;
     const TIFF_PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO=1;
     const TIFF_PHOTOMETRIC_INTERPRETATION_RGB=2;
     const TIFF_PHOTOMETRIC_INTERPRETATION_RGB_INDEXED=3;
     const TIFF_PHOTOMETRIC_INTERPRETATION_CMYK=5;
     const TIFF_PHOTOMETRIC_INTERPRETATION_YCBCR=6;
     const TIFF_PHOTOMETRIC_INTERPRETATION_CIELAB=8;
 
   /* PNG Constants */
 
     const PNG_COMPRESSION_DEFAULT_STRATEGY = 0;
     const PNG_COMPRESSION_FILTERED = 1;
     const PNG_COMPRESSION_HUFFMAN_ONLY = 2;
     const PNG_COMPRESSION_RLE = 3;
 
     const PNG_FILTER_NONE = 0;
     const PNG_FILTER_SUB = 1;
     const PNG_FILTER_UP = 2;
     const PNG_FILTER_AVERAGE = 3;
     const PNG_FILTER_PAETH = 4;
 
     const PNG_INTERLACING_DISABLED = 0;
     const PNG_INTERLACING_ENABLED = 1;
 
     const PNG_CHANNEL_GRAY = 0;
     const PNG_CHANNEL_RGB = 2;
     const PNG_CHANNEL_INDEXED = 3;
     const PNG_CHANNEL_GRAY_ALPHA = 4;
     const PNG_CHANNEL_RGB_ALPHA = 6;
 
   /**** Public Interface ****/
 
 
   /* Factory Methods */
 
     /**
      * Returns a {@link Zend_Pdf_Resource_Image} object by file path.
      *
      * @param string $filePath Full path to the image file.
      * @return Zend_Pdf_Resource_Image
      * @throws Zend_Pdf_Exception
      */
     public static function imageWithPath($filePath)
     {
         /**
          * use old implementation
          * @todo switch to new implementation
          */
         // require_once 'Zend/Pdf/Resource/ImageFactory.php';
         return Zend_Pdf_Resource_ImageFactory::factory($filePath);
 
 
         /* Create a file parser data source object for this file. File path and
          * access permission checks are handled here.
          */
         // require_once 'Zend/Pdf/FileParserDataSource/File.php';
         $dataSource = new Zend_Pdf_FileParserDataSource_File($filePath);
 
         /* Attempt to determine the type of image. We can't always trust file
          * extensions, but try that first since it's fastest.
          */
         $fileExtension = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));
 
         /* If it turns out that the file is named improperly and we guess the
          * wrong type, we'll get null instead of an image object.
          */
         switch ($fileExtension) {
             case 'tif':
                 //Fall through to next case;
             case 'tiff':
                 $image = Zend_Pdf_Image::_extractTiffImage($dataSource);
                 break;
             case 'png':
                 $image = Zend_Pdf_Image::_extractPngImage($dataSource);
                 break;
             case 'jpg':
                 //Fall through to next case;
             case 'jpe':
                 //Fall through to next case;
             case 'jpeg':
                 $image = Zend_Pdf_Image::_extractJpegImage($dataSource);
                 break;
             default:
                 // require_once 'Zend/Pdf/Exception.php';
                 throw new Zend_Pdf_Exception("Cannot create image resource. File extension not known or unsupported type.");
                 break;
         }
 
         /* Done with the data source object.
          */
         $dataSource = null;
 
         if ($image !== null) {
             return $image;
 
         } else {
             /* The type of image could not be determined. Give up.
              */
             // require_once 'Zend/Pdf/Exception.php';
             throw new Zend_Pdf_Exception("Cannot determine image type: $filePath",
                                          Zend_Pdf_Exception::CANT_DETERMINE_IMAGE_TYPE);
          }
     }
 
 
 
     /**** Internal Methods ****/
 
 
     /* Image Extraction Methods */
 
     /**
      * Attempts to extract a JPEG Image from the data source.
      *
      * @param Zend_Pdf_FileParserDataSource $dataSource
      * @return Zend_Pdf_Resource_Image_Jpeg May also return null if
      *   the data source does not appear to contain valid image data.
      * @throws Zend_Pdf_Exception
      */
     protected static function _extractJpegImage($dataSource)
     {
         // require_once 'Zend/Pdf/Exception.php';
         throw new Zend_Pdf_Exception('Jpeg image fileparser is not implemented. Old styly implementation has to be used.');
 
         // require_once 'Zend/Pdf/FileParser/Image/Jpeg.php';
         $imageParser = new Zend_Pdf_FileParser_Image_Jpeg($dataSource);
         // require_once 'Zend/Pdf/Resource/Image/Jpeg.php';
         $image = new Zend_Pdf_Resource_Image_Jpeg($imageParser);
         unset($imageParser);
 
         return $image;
     }
 
     /**
      * Attempts to extract a PNG Image from the data source.
      *
      * @param Zend_Pdf_FileParserDataSource $dataSource
      * @return Zend_Pdf_Resource_Image_Png May also return null if
      *   the data source does not appear to contain valid image data.
      */
     protected static function _extractPngImage($dataSource)
     {
         // require_once 'Zend/Pdf/FileParser/Image/Png.php';
         $imageParser = new Zend_Pdf_FileParser_Image_Png($dataSource);
         // require_once 'Zend/Pdf/Resource/Image/Png.php';
         $image = new Zend_Pdf_Resource_Image_Png($imageParser);
         unset($imageParser);
 
         return $image;
     }
 
     /**
      * Attempts to extract a TIFF Image from the data source.
      *
      * @param Zend_Pdf_FileParserDataSource $dataSource
      * @return Zend_Pdf_Resource_Image_Tiff May also return null if
      *   the data source does not appear to contain valid image data.
      * @throws Zend_Pdf_Exception
      */
     protected static function _extractTiffImage($dataSource)
     {
         // require_once 'Zend/Pdf/Exception.php';
         throw new Zend_Pdf_Exception('Tiff image fileparser is not implemented. Old styly implementation has to be used.');
 
         // require_once 'Zend/Pdf/FileParser/Image/Tiff.php';
         $imageParser = new Zend_Pdf_FileParser_Image_Tiff($dataSource);
         // require_once 'Zend/Pdf/Resource/Image/Tiff.php';
         $image = new Zend_Pdf_Resource_Image_Tiff($imageParser);
         unset($imageParser);
 
         return $image;
     }
 }