227 lines
7.4 KiB
PHP
227 lines
7.4 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Pdf
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* @subpackage Fonts
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: TrimmedTable.php 16541 2009-07-07 06:59:03Z bkarwin $
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*/
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/** Zend_Pdf_Cmap */
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require_once 'Zend/Pdf/Cmap.php';
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/**
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* Implements the "trimmed table mapping" character map (type 6).
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*
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* This table type is preferred over the {@link Zend_Pdf_Cmap_SegmentToDelta}
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* table when the Unicode characters covered by the font fall into a single
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* contiguous range.
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*
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* @package Zend_Pdf
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* @subpackage Fonts
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Pdf_Cmap_TrimmedTable extends Zend_Pdf_Cmap
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{
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/**** Instance Variables ****/
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/**
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* The starting character code covered by this table.
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* @var integer
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*/
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protected $_startCode = 0;
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/**
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* The ending character code covered by this table.
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* @var integer
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*/
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protected $_endCode = 0;
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/**
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* Glyph index array. Stores the actual glyph numbers.
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* @var array
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*/
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protected $_glyphIndexArray = array();
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/**** Public Interface ****/
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/* Concrete Class Implementation */
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/**
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* Returns an array of glyph numbers corresponding to the Unicode characters.
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*
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* If a particular character doesn't exist in this font, the special 'missing
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* character glyph' will be substituted.
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*
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* See also {@link glyphNumberForCharacter()}.
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*
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* @param array $characterCodes Array of Unicode character codes (code points).
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* @return array Array of glyph numbers.
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*/
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public function glyphNumbersForCharacters($characterCodes)
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{
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$glyphNumbers = array();
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foreach ($characterCodes as $key => $characterCode) {
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if (($characterCode < $this->_startCode) || ($characterCode > $this->_endCode)) {
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$glyphNumbers[$key] = Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
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continue;
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}
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$glyphIndex = $characterCode - $this->_startCode;
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$glyphNumbers[$key] = $this->_glyphIndexArray[$glyphIndex];
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}
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return $glyphNumbers;
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}
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/**
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* Returns the glyph number corresponding to the Unicode character.
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*
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* If a particular character doesn't exist in this font, the special 'missing
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* character glyph' will be substituted.
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*
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* See also {@link glyphNumbersForCharacters()} which is optimized for bulk
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* operations.
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*
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* @param integer $characterCode Unicode character code (code point).
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* @return integer Glyph number.
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*/
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public function glyphNumberForCharacter($characterCode)
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{
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if (($characterCode < $this->_startCode) || ($characterCode > $this->_endCode)) {
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return Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
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}
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$glyphIndex = $characterCode - $this->_startCode;
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return $this->_glyphIndexArray[$glyphIndex];
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}
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/**
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* Returns an array containing the Unicode characters that have entries in
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* this character map.
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*
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* @return array Unicode character codes.
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*/
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public function getCoveredCharacters()
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{
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$characterCodes = array();
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for ($code = $this->_startCode; $code <= $this->_endCode; $code++) {
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$characterCodes[] = $code;
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}
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return $characterCodes;
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}
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/**
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* Returns an array containing the glyphs numbers that have entries in this character map.
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* Keys are Unicode character codes (integers)
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*
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* This functionality is partially covered by glyphNumbersForCharacters(getCoveredCharacters())
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* call, but this method do it in more effective way (prepare complete list instead of searching
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* glyph for each character code).
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*
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* @internal
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* @return array Array representing <Unicode character code> => <glyph number> pairs.
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*/
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public function getCoveredCharactersGlyphs()
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{
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$glyphNumbers = array();
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for ($code = $this->_startCode; $code <= $this->_endCode; $code++) {
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$glyphNumbers[$code] = $this->_glyphIndexArray[$code - $this->_startCode];
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}
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return $glyphNumbers;
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}
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/* Object Lifecycle */
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/**
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* Object constructor
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*
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* Parses the raw binary table data. Throws an exception if the table is
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* malformed.
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*
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* @param string $cmapData Raw binary cmap table data.
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* @throws Zend_Pdf_Exception
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*/
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public function __construct($cmapData)
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{
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/* Sanity check: The table should be at least 9 bytes in size.
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*/
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$actualLength = strlen($cmapData);
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if ($actualLength < 9) {
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throw new Zend_Pdf_Exception('Insufficient table data',
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Zend_Pdf_Exception::CMAP_TABLE_DATA_TOO_SMALL);
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}
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/* Sanity check: Make sure this is right data for this table type.
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*/
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$type = $this->_extractUInt2($cmapData, 0);
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if ($type != Zend_Pdf_Cmap::TYPE_TRIMMED_TABLE) {
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throw new Zend_Pdf_Exception('Wrong cmap table type',
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Zend_Pdf_Exception::CMAP_WRONG_TABLE_TYPE);
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}
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$length = $this->_extractUInt2($cmapData, 2);
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if ($length != $actualLength) {
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throw new Zend_Pdf_Exception("Table length ($length) does not match actual length ($actualLength)",
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Zend_Pdf_Exception::CMAP_WRONG_TABLE_LENGTH);
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}
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/* Mapping tables should be language-independent. The font may not work
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* as expected if they are not. Unfortunately, many font files in the
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* wild incorrectly record a language ID in this field, so we can't
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* call this a failure.
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*/
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$language = $this->_extractUInt2($cmapData, 4);
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if ($language != 0) {
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// Record a warning here somehow?
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}
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$this->_startCode = $this->_extractUInt2($cmapData, 6);
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$entryCount = $this->_extractUInt2($cmapData, 8);
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$expectedCount = ($length - 10) >> 1;
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if ($entryCount != $expectedCount) {
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throw new Zend_Pdf_Exception("Entry count is wrong; expected: $expectedCount; actual: $entryCount",
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Zend_Pdf_Exception::CMAP_WRONG_ENTRY_COUNT);
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}
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$this->_endCode = $this->_startCode + $entryCount - 1;
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$offset = 10;
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for ($i = 0; $i < $entryCount; $i++, $offset += 2) {
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$this->_glyphIndexArray[] = $this->_extractUInt2($cmapData, $offset);
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}
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/* Sanity check: After reading all of the data, we should be at the end
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* of the table.
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*/
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if ($offset != $length) {
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throw new Zend_Pdf_Exception("Ending offset ($offset) does not match length ($length)",
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Zend_Pdf_Exception::CMAP_FINAL_OFFSET_NOT_LENGTH);
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}
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}
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}
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