402 lines
14 KiB
PHP
402 lines
14 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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* @package Zend_Pdf
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* @subpackage Fonts
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* @copyright Copyright (c) 2005-2008 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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/** Zend_Pdf_Cmap */
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require_once 'Zend/Pdf/Cmap.php';
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/**
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* Implements the "segment mapping to delta values" character map (type 4).
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*
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* This is the Microsoft standard mapping table type for OpenType fonts. It
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* provides the ability to cover multiple contiguous ranges of the Unicode
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* character set, with the exception of Unicode Surrogates (U+D800 - U+DFFF).
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*
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* @package Zend_Pdf
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* @subpackage Fonts
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* @copyright Copyright (c) 2005-2008 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_SegmentToDelta extends Zend_Pdf_Cmap
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{
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/**** Instance Variables ****/
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/**
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* The number of segments in the table.
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* @var integer
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*/
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protected $_segmentCount = 0;
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/**
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* The size of the binary search range for segments.
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* @var integer
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*/
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protected $_searchRange = 0;
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/**
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* The number of binary search steps required to cover the entire search
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* range.
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* @var integer
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*/
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protected $_searchIterations = 0;
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/**
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* Array of ending character codes for each segment.
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* @var array
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*/
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protected $_segmentTableEndCodes = array();
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/**
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* The ending character code for the segment at the end of the low search
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* range.
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* @var integer
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*/
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protected $_searchRangeEndCode = 0;
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/**
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* Array of starting character codes for each segment.
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* @var array
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*/
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protected $_segmentTableStartCodes = array();
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/**
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* Array of character code to glyph delta values for each segment.
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* @var array
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*/
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protected $_segmentTableIdDeltas = array();
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/**
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* Array of offsets into the glyph index array for each segment.
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* @var array
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*/
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protected $_segmentTableIdRangeOffsets = array();
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/**
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* Glyph index array. Stores glyph numbers, used with range offset.
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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 => $characterCode) {
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/* These tables only cover the 16-bit character range.
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*/
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if ($characterCode > 0xffff) {
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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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/* Determine where to start the binary search. The segments are
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* ordered from lowest-to-highest. We are looking for the first
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* segment whose end code is greater than or equal to our character
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* code.
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*
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* If the end code at the top of the search range is larger, then
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* our target is probably below it.
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*
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* If it is smaller, our target is probably above it, so move the
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* search range to the end of the segment list.
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*/
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if ($this->_searchRangeEndCode >= $characterCode) {
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$searchIndex = $this->_searchRange;
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} else {
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$searchIndex = $this->_segmentCount;
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}
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/* Now do a binary search to find the first segment whose end code
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* is greater or equal to our character code. No matter the number
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* of segments (there may be hundreds in a large font), we will only
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* need to perform $this->_searchIterations.
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*/
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for ($i = 1; $i <= $this->_searchIterations; $i++) {
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if ($this->_segmentTableEndCodes[$searchIndex] >= $characterCode) {
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$subtableIndex = $searchIndex;
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$searchIndex -= $this->_searchRange >> $i;
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} else {
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$searchIndex += $this->_searchRange >> $i;
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}
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}
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/* If the segment's start code is greater than our character code,
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* that character is not represented in this font. Move on.
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*/
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if ($this->_segmentTableStartCodes[$subtableIndex] > $characterCode) {
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$glyphNumbers[$key] = Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
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continue;
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}
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if ($this->_segmentTableIdRangeOffsets[$subtableIndex] == 0) {
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/* This segment uses a simple mapping from character code to
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* glyph number.
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*/
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$glyphNumbers[$key] = ($characterCode + $this->_segmentTableIdDeltas[$subtableIndex]) % 65536;
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} else {
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/* This segment relies on the glyph index array to determine the
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* glyph number. The calculation below determines the correct
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* index into that array. It's a little odd because the range
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* offset in the font file is designed to quickly provide an
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* address of the index in the raw binary data instead of the
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* index itself. Since we've parsed the data into arrays, we
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* must process it a bit differently.
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*/
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$glyphIndex = ($characterCode - $this->_segmentTableStartCodes[$subtableIndex] +
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$this->_segmentTableIdRangeOffsets[$subtableIndex] - $this->_segmentCount +
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$subtableIndex - 1);
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$glyphNumbers[$key] = $this->_glyphIndexArray[$glyphIndex];
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}
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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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/* This code is pretty much a copy of glyphNumbersForCharacters().
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* See that method for inline documentation.
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*/
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if ($characterCode > 0xffff) {
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return Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
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}
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if ($this->_searchRangeEndCode >= $characterCode) {
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$searchIndex = $this->_searchRange;
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} else {
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$searchIndex = $this->_segmentCount;
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}
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for ($i = 1; $i <= $this->_searchIterations; $i++) {
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if ($this->_segmentTableEndCodes[$searchIndex] >= $characterCode) {
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$subtableIndex = $searchIndex;
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$searchIndex -= $this->_searchRange >> $i;
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} else {
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$searchIndex += $this->_searchRange >> $i;
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}
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}
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if ($this->_segmentTableStartCodes[$subtableIndex] > $characterCode) {
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return Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
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}
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if ($this->_segmentTableIdRangeOffsets[$subtableIndex] == 0) {
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$glyphNumber = ($characterCode + $this->_segmentTableIdDeltas[$subtableIndex]) % 65536;
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} else {
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$glyphIndex = ($characterCode - $this->_segmentTableStartCodes[$subtableIndex] +
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$this->_segmentTableIdRangeOffsets[$subtableIndex] - $this->_segmentCount +
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$subtableIndex - 1);
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$glyphNumber = $this->_glyphIndexArray[$glyphIndex];
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}
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return $glyphNumber;
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}
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/**
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* Returns an array containing the Unicode characters that have entries in
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* this character map.
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*
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* @return array Unicode character codes.
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*/
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public function getCoveredCharacters()
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{
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$characterCodes = array();
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for ($i = 1; $i <= $this->_segmentCount; $i++) {
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for ($code = $this->_segmentTableStartCodes[$i]; $code <= $this->_segmentTableEndCodes[$i]; $code++) {
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$characterCodes[] = $code;
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}
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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 ($segmentNum = 1; $segmentNum <= $this->_segmentCount; $segmentNum++) {
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if ($this->_segmentTableIdRangeOffsets[$segmentNum] == 0) {
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$delta = $this->_segmentTableIdDeltas[$segmentNum];
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for ($code = $this->_segmentTableStartCodes[$segmentNum];
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$code <= $this->_segmentTableEndCodes[$segmentNum];
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$code++) {
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$glyphNumbers[$code] = ($code + $delta) % 65536;
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}
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} else {
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$code = $this->_segmentTableStartCodes[$segmentNum];
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$glyphIndex = $this->_segmentTableIdRangeOffsets[$segmentNum] - ($this->_segmentCount - $segmentNum) - 1;
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while ($code <= $this->_segmentTableEndCodes[$segmentNum]) {
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$glyphNumbers[$code] = $this->_glyphIndexArray[$glyphIndex];
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$code++;
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$glyphIndex++;
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}
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}
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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 23 bytes in size.
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*/
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$actualLength = strlen($cmapData);
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if ($actualLength < 23) {
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throw new Zend_Pdf_Exception('Insufficient table data',
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Zend_Pdf_Exception::CMAP_TABLE_DATA_TOO_SMALL);
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}
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/* Sanity check: Make sure this is right data for this table type.
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*/
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$type = $this->_extractUInt2($cmapData, 0);
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if ($type != Zend_Pdf_Cmap::TYPE_SEGMENT_TO_DELTA) {
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throw new Zend_Pdf_Exception('Wrong cmap table type',
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Zend_Pdf_Exception::CMAP_WRONG_TABLE_TYPE);
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}
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$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 ($language != 0) {
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// Record a warning here somehow?
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}
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/* These two values are stored premultiplied by two which is convienent
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* when using the binary data directly, but we're parsing it out to
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* native PHP data types, so divide by two.
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*/
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$this->_segmentCount = $this->_extractUInt2($cmapData, 6) >> 1;
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$this->_searchRange = $this->_extractUInt2($cmapData, 8) >> 1;
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$this->_searchIterations = $this->_extractUInt2($cmapData, 10) + 1;
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$offset = 14;
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for ($i = 1; $i <= $this->_segmentCount; $i++, $offset += 2) {
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$this->_segmentTableEndCodes[$i] = $this->_extractUInt2($cmapData, $offset);
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}
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$this->_searchRangeEndCode = $this->_segmentTableEndCodes[$this->_searchRange];
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$offset += 2; // reserved bytes
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for ($i = 1; $i <= $this->_segmentCount; $i++, $offset += 2) {
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$this->_segmentTableStartCodes[$i] = $this->_extractUInt2($cmapData, $offset);
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}
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for ($i = 1; $i <= $this->_segmentCount; $i++, $offset += 2) {
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$this->_segmentTableIdDeltas[$i] = $this->_extractInt2($cmapData, $offset); // signed
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}
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/* The range offset helps determine the index into the glyph index array.
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* Like the segment count and search range above, it's stored as a byte
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* multiple in the font, so divide by two as we extract the values.
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*/
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for ($i = 1; $i <= $this->_segmentCount; $i++, $offset += 2) {
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$this->_segmentTableIdRangeOffsets[$i] = $this->_extractUInt2($cmapData, $offset) >> 1;
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}
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/* The size of the glyph index array varies by font and depends on the
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* extent of the usage of range offsets versus deltas. Some fonts may
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* not have any entries in this array.
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*/
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for (; $offset < $length; $offset += 2) {
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$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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