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/framework/vendor/zend/Zend/Pdf/Cmap/TrimmedTable.php

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PHP | 231 lines | 87 code | 33 blank | 111 comment | 18 complexity | 92a67c13540a39f804d02674f6efcb67 MD5 | raw file
Possible License(s): BSD-3-Clause, LGPL-2.1
  1. <?php
  2. /**
  3. * Zend Framework
  4. *
  5. * LICENSE
  6. *
  7. * This source file is subject to the new BSD license that is bundled
  8. * with this package in the file LICENSE.txt.
  9. * It is also available through the world-wide-web at this URL:
  10. * http://framework.zend.com/license/new-bsd
  11. * If you did not receive a copy of the license and are unable to
  12. * obtain it through the world-wide-web, please send an email
  13. * to license@zend.com so we can send you a copy immediately.
  14. *
  15. * @category Zend
  16. * @package Zend_Pdf
  17. * @subpackage Fonts
  18. * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
  19. * @license http://framework.zend.com/license/new-bsd New BSD License
  20. * @version $Id: TrimmedTable.php 20096 2010-01-06 02:05:09Z bkarwin $
  21. */
  22. /** Zend_Pdf_Cmap */
  23. require_once 'Zend/Pdf/Cmap.php';
  24. /**
  25. * Implements the "trimmed table mapping" character map (type 6).
  26. *
  27. * This table type is preferred over the {@link Zend_Pdf_Cmap_SegmentToDelta}
  28. * table when the Unicode characters covered by the font fall into a single
  29. * contiguous range.
  30. *
  31. * @package Zend_Pdf
  32. * @subpackage Fonts
  33. * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
  34. * @license http://framework.zend.com/license/new-bsd New BSD License
  35. */
  36. class Zend_Pdf_Cmap_TrimmedTable extends Zend_Pdf_Cmap
  37. {
  38. /**** Instance Variables ****/
  39. /**
  40. * The starting character code covered by this table.
  41. * @var integer
  42. */
  43. protected $_startCode = 0;
  44. /**
  45. * The ending character code covered by this table.
  46. * @var integer
  47. */
  48. protected $_endCode = 0;
  49. /**
  50. * Glyph index array. Stores the actual glyph numbers.
  51. * @var array
  52. */
  53. protected $_glyphIndexArray = array();
  54. /**** Public Interface ****/
  55. /* Concrete Class Implementation */
  56. /**
  57. * Returns an array of glyph numbers corresponding to the Unicode characters.
  58. *
  59. * If a particular character doesn't exist in this font, the special 'missing
  60. * character glyph' will be substituted.
  61. *
  62. * See also {@link glyphNumberForCharacter()}.
  63. *
  64. * @param array $characterCodes Array of Unicode character codes (code points).
  65. * @return array Array of glyph numbers.
  66. */
  67. public function glyphNumbersForCharacters($characterCodes)
  68. {
  69. $glyphNumbers = array();
  70. foreach ($characterCodes as $key => $characterCode) {
  71. if (($characterCode < $this->_startCode) || ($characterCode > $this->_endCode)) {
  72. $glyphNumbers[$key] = Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
  73. continue;
  74. }
  75. $glyphIndex = $characterCode - $this->_startCode;
  76. $glyphNumbers[$key] = $this->_glyphIndexArray[$glyphIndex];
  77. }
  78. return $glyphNumbers;
  79. }
  80. /**
  81. * Returns the glyph number corresponding to the Unicode character.
  82. *
  83. * If a particular character doesn't exist in this font, the special 'missing
  84. * character glyph' will be substituted.
  85. *
  86. * See also {@link glyphNumbersForCharacters()} which is optimized for bulk
  87. * operations.
  88. *
  89. * @param integer $characterCode Unicode character code (code point).
  90. * @return integer Glyph number.
  91. */
  92. public function glyphNumberForCharacter($characterCode)
  93. {
  94. if (($characterCode < $this->_startCode) || ($characterCode > $this->_endCode)) {
  95. return Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
  96. }
  97. $glyphIndex = $characterCode - $this->_startCode;
  98. return $this->_glyphIndexArray[$glyphIndex];
  99. }
  100. /**
  101. * Returns an array containing the Unicode characters that have entries in
  102. * this character map.
  103. *
  104. * @return array Unicode character codes.
  105. */
  106. public function getCoveredCharacters()
  107. {
  108. $characterCodes = array();
  109. for ($code = $this->_startCode; $code <= $this->_endCode; $code++) {
  110. $characterCodes[] = $code;
  111. }
  112. return $characterCodes;
  113. }
  114. /**
  115. * Returns an array containing the glyphs numbers that have entries in this character map.
  116. * Keys are Unicode character codes (integers)
  117. *
  118. * This functionality is partially covered by glyphNumbersForCharacters(getCoveredCharacters())
  119. * call, but this method do it in more effective way (prepare complete list instead of searching
  120. * glyph for each character code).
  121. *
  122. * @internal
  123. * @return array Array representing <Unicode character code> => <glyph number> pairs.
  124. */
  125. public function getCoveredCharactersGlyphs()
  126. {
  127. $glyphNumbers = array();
  128. for ($code = $this->_startCode; $code <= $this->_endCode; $code++) {
  129. $glyphNumbers[$code] = $this->_glyphIndexArray[$code - $this->_startCode];
  130. }
  131. return $glyphNumbers;
  132. }
  133. /* Object Lifecycle */
  134. /**
  135. * Object constructor
  136. *
  137. * Parses the raw binary table data. Throws an exception if the table is
  138. * malformed.
  139. *
  140. * @param string $cmapData Raw binary cmap table data.
  141. * @throws Zend_Pdf_Exception
  142. */
  143. public function __construct($cmapData)
  144. {
  145. /* Sanity check: The table should be at least 9 bytes in size.
  146. */
  147. $actualLength = strlen($cmapData);
  148. if ($actualLength < 9) {
  149. require_once 'Zend/Pdf/Exception.php';
  150. throw new Zend_Pdf_Exception('Insufficient table data',
  151. Zend_Pdf_Exception::CMAP_TABLE_DATA_TOO_SMALL);
  152. }
  153. /* Sanity check: Make sure this is right data for this table type.
  154. */
  155. $type = $this->_extractUInt2($cmapData, 0);
  156. if ($type != Zend_Pdf_Cmap::TYPE_TRIMMED_TABLE) {
  157. require_once 'Zend/Pdf/Exception.php';
  158. throw new Zend_Pdf_Exception('Wrong cmap table type',
  159. Zend_Pdf_Exception::CMAP_WRONG_TABLE_TYPE);
  160. }
  161. $length = $this->_extractUInt2($cmapData, 2);
  162. if ($length != $actualLength) {
  163. require_once 'Zend/Pdf/Exception.php';
  164. throw new Zend_Pdf_Exception("Table length ($length) does not match actual length ($actualLength)",
  165. Zend_Pdf_Exception::CMAP_WRONG_TABLE_LENGTH);
  166. }
  167. /* Mapping tables should be language-independent. The font may not work
  168. * as expected if they are not. Unfortunately, many font files in the
  169. * wild incorrectly record a language ID in this field, so we can't
  170. * call this a failure.
  171. */
  172. $language = $this->_extractUInt2($cmapData, 4);
  173. if ($language != 0) {
  174. // Record a warning here somehow?
  175. }
  176. $this->_startCode = $this->_extractUInt2($cmapData, 6);
  177. $entryCount = $this->_extractUInt2($cmapData, 8);
  178. $expectedCount = ($length - 10) >> 1;
  179. if ($entryCount != $expectedCount) {
  180. require_once 'Zend/Pdf/Exception.php';
  181. throw new Zend_Pdf_Exception("Entry count is wrong; expected: $expectedCount; actual: $entryCount",
  182. Zend_Pdf_Exception::CMAP_WRONG_ENTRY_COUNT);
  183. }
  184. $this->_endCode = $this->_startCode + $entryCount - 1;
  185. $offset = 10;
  186. for ($i = 0; $i < $entryCount; $i++, $offset += 2) {
  187. $this->_glyphIndexArray[] = $this->_extractUInt2($cmapData, $offset);
  188. }
  189. /* Sanity check: After reading all of the data, we should be at the end
  190. * of the table.
  191. */
  192. if ($offset != $length) {
  193. require_once 'Zend/Pdf/Exception.php';
  194. throw new Zend_Pdf_Exception("Ending offset ($offset) does not match length ($length)",
  195. Zend_Pdf_Exception::CMAP_FINAL_OFFSET_NOT_LENGTH);
  196. }
  197. }
  198. }