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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 Fonts
  * @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    $Id$
  */
 
 
 /** Internally used classes */
 // require_once 'Zend/Pdf/Element/Name.php';
 
 
 /** Zend_Pdf_Resource_Font */
 // require_once 'Zend/Pdf/Resource/Font.php';
 
 /**
  * Adobe PDF Simple fonts implementation
  *
  * PDF simple fonts functionality is presented by Adobe Type 1
  * (including standard PDF Type1 built-in fonts) and TrueType fonts support.
  *
  * Both fonts have the following properties:
  * - Glyphs in the font are selected by single-byte character codes obtained from a
  *   string that is shown by the text-showing operators. Logically, these codes index
  *   into a table of 256 glyphs; the mapping from codes to glyphs is called the font’s
  *   encoding.
  *   PDF specification provides a possibility to specify any user defined encoding in addition
  *   to the standard built-in encodings: Standard-Encoding, MacRomanEncoding, WinAnsiEncoding,
  *   and PDFDocEncoding, but Zend_Pdf simple fonts implementation operates only with
  *   Windows ANSI encoding (except Symbol and ZapfDingbats built-in fonts).
  *
  * - Each glyph has a single set of metrics, including a horizontal displacement or
  *   width. That is, simple fonts support only horizontal writing mode.
  *
  *
  * The code in this class is common to both types. However, you will only deal
  * directly with subclasses.
  *
  * Font objects should be normally be obtained from the factory methods
  * {@link Zend_Pdf_Font::fontWithName} and {@link Zend_Pdf_Font::fontWithPath}.
  *
  * @package    Zend_Pdf
  * @subpackage Fonts
  * @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_Resource_Font_Simple extends Zend_Pdf_Resource_Font
 {
     /**
      * Object representing the font's cmap (character to glyph map).
      * @var Zend_Pdf_Cmap
      */
     protected $_cmap = null;
 
     /**
      * Array containing the widths of each of the glyphs contained in the font.
      *
      * Keys are integers starting from 0, which coresponds to Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH.
      *
      * Font character map may contain gaps for actually used glyphs, nevertheless glyphWidths array
      * contains widths for all glyphs even they are unused.
      *
      * @var array
      */
     protected $_glyphWidths = null;
 
     /**
      * Width for glyphs missed in the font
      *
      * Note: Adobe PDF specfication (V1.4 - V1.6) doesn't define behavior for rendering
      * characters missed in the standard PDF fonts (such us 0x7F (DEL) Windows ANSI code)
      * Adobe Font Metrics files doesn't also define metrics for "missed glyph".
      * We provide character width as "0" for this case, but actually it depends on PDF viewer
      * implementation.
      *
      * @var integer
      */
     protected $_missingGlyphWidth = 0;
 
 
     /**** Public Interface ****/
 
 
   /* Object Lifecycle */
 
     /**
      * Object constructor
      *
      */
     public function __construct()
     {
         parent::__construct();
 
         /**
          * @todo
          * It's easy to add other encodings support now (Standard-Encoding, MacRomanEncoding,
          * PDFDocEncoding, MacExpertEncoding, Symbol, and ZapfDingbats).
          * Steps for the implementation:
          * - completely describe all PDF single byte encodings in the documentation
          * - implement non-WinAnsi encodings processing into encodeString()/decodeString() methods
          *
          * These encodings will be automatically supported for standard builtin PDF fonts as well
          * as for external fonts.
          */
         $this->_resource->Encoding = new Zend_Pdf_Element_Name('WinAnsiEncoding');
     }
 
     /**
      * Returns an array of glyph numbers corresponding to the Unicode characters.
      *
      * If a particular character doesn't exist in this font, the special 'missing
      * character glyph' will be substituted.
      *
      * See also {@link glyphNumberForCharacter()}.
      *
      * @param array $characterCodes Array of Unicode character codes (code points).
      * @return array Array of glyph numbers.
      */
     public function glyphNumbersForCharacters($characterCodes)
     {
         return $this->_cmap->glyphNumbersForCharacters($characterCodes);
     }
 
     /**
      * Returns the glyph number corresponding to the Unicode character.
      *
      * If a particular character doesn't exist in this font, the special 'missing
      * character glyph' will be substituted.
      *
      * See also {@link glyphNumbersForCharacters()} which is optimized for bulk
      * operations.
      *
      * @param integer $characterCode Unicode character code (code point).
      * @return integer Glyph number.
      */
     public function glyphNumberForCharacter($characterCode)
     {
         return $this->_cmap->glyphNumberForCharacter($characterCode);
     }
 
     /**
      * Returns a number between 0 and 1 inclusive that indicates the percentage
      * of characters in the string which are covered by glyphs in this font.
      *
      * Since no one font will contain glyphs for the entire Unicode character
      * range, this method can be used to help locate a suitable font when the
      * actual contents of the string are not known.
      *
      * Note that some fonts lie about the characters they support. Additionally,
      * fonts don't usually contain glyphs for control characters such as tabs
      * and line breaks, so it is rare that you will get back a full 1.0 score.
      * The resulting value should be considered informational only.
      *
      * @param string $string
      * @param string $charEncoding (optional) Character encoding of source text.
      *   If omitted, uses 'current locale'.
      * @return float
      */
     public function getCoveredPercentage($string, $charEncoding = '')
     {
         /* Convert the string to UTF-16BE encoding so we can match the string's
          * character codes to those found in the cmap.
          */
         if ($charEncoding != 'UTF-16BE') {
             if (PHP_OS != 'AIX') { // AIX doesnt know what UTF-16BE is
                 $string = iconv($charEncoding, 'UTF-16BE', $string);
             }
         }
 
         $charCount = (PHP_OS != 'AIX') ? iconv_strlen($string, 'UTF-16BE') : strlen($string);
         if ($charCount == 0) {
             return 0;
         }
 
         /* Fetch the covered character code list from the font's cmap.
          */
         $coveredCharacters = $this->_cmap->getCoveredCharacters();
 
         /* Calculate the score by doing a lookup for each character.
          */
         $score = 0;
         $maxIndex = strlen($string);
         for ($i = 0; $i < $maxIndex; $i++) {
             /**
              * @todo Properly handle characters encoded as surrogate pairs.
              */
             $charCode = (ord($string[$i]) << 8) | ord($string[++$i]);
             /* This could probably be optimized a bit with a binary search...
              */
             if (in_array($charCode, $coveredCharacters)) {
                 $score++;
             }
         }
         return $score / $charCount;
     }
 
     /**
      * Returns the widths of the glyphs.
      *
      * The widths are expressed in the font's glyph space. You are responsible
      * for converting to user space as necessary. See {@link unitsPerEm()}.
      *
      * See also {@link widthForGlyph()}.
      *
      * @param array &$glyphNumbers Array of glyph numbers.
      * @return array Array of glyph widths (integers).
      */
     public function widthsForGlyphs($glyphNumbers)
     {
         $widths = array();
         foreach ($glyphNumbers as $key => $glyphNumber) {
             if (!isset($this->_glyphWidths[$glyphNumber])) {
                 $widths[$key] = $this->_missingGlyphWidth;
             } else {
                 $widths[$key] = $this->_glyphWidths[$glyphNumber];
             }
         }
         return $widths;
     }
 
     /**
      * Returns the width of the glyph.
      *
      * Like {@link widthsForGlyphs()} but used for one glyph at a time.
      *
      * @param integer $glyphNumber
      * @return integer
      */
     public function widthForGlyph($glyphNumber)
     {
         if (!isset($this->_glyphWidths[$glyphNumber])) {
             return $this->_missingGlyphWidth;
         }
         return $this->_glyphWidths[$glyphNumber];
     }
 
     /**
      * Convert string to the font encoding.
      *
      * The method is used to prepare string for text drawing operators
      *
      * @param string $string
      * @param string $charEncoding Character encoding of source text.
      * @return string
      */
     public function encodeString($string, $charEncoding)
     {
         if (PHP_OS == 'AIX') {
             return $string; // returning here b/c AIX doesnt know what CP1252 is
         }
 
         return iconv($charEncoding, 'CP1252//IGNORE', $string);
     }
 
     /**
      * Convert string from the font encoding.
      *
      * The method is used to convert strings retrieved from existing content streams
      *
      * @param string $string
      * @param string $charEncoding Character encoding of resulting text.
      * @return string
      */
     public function decodeString($string, $charEncoding)
     {
         return iconv('CP1252', $charEncoding, $string);
     }
 }