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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
  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
 23/** Zend_Pdf_Cmap */
 24require_once 'Zend/Pdf/Cmap.php';
 25
 26
 27/**
 28 * Implements the "trimmed table mapping" character map (type 6).
 29 *
 30 * This table type is preferred over the {@link Zend_Pdf_Cmap_SegmentToDelta}
 31 * table when the Unicode characters covered by the font fall into a single
 32 * contiguous range.
 33 *
 34 * @package    Zend_Pdf
 35 * @subpackage Fonts
 36 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 37 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 38 */
 39class Zend_Pdf_Cmap_TrimmedTable extends Zend_Pdf_Cmap
 40{
 41  /**** Instance Variables ****/
 42
 43
 44    /**
 45     * The starting character code covered by this table.
 46     * @var integer
 47     */
 48    protected $_startCode = 0;
 49
 50    /**
 51     * The ending character code covered by this table.
 52     * @var integer
 53     */
 54    protected $_endCode = 0;
 55
 56    /**
 57     * Glyph index array. Stores the actual glyph numbers.
 58     * @var array
 59     */
 60    protected $_glyphIndexArray = array();
 61
 62
 63
 64  /**** Public Interface ****/
 65
 66
 67  /* Concrete Class Implementation */
 68
 69    /**
 70     * Returns an array of glyph numbers corresponding to the Unicode characters.
 71     *
 72     * If a particular character doesn't exist in this font, the special 'missing
 73     * character glyph' will be substituted.
 74     *
 75     * See also {@link glyphNumberForCharacter()}.
 76     *
 77     * @param array $characterCodes Array of Unicode character codes (code points).
 78     * @return array Array of glyph numbers.
 79     */
 80    public function glyphNumbersForCharacters($characterCodes)
 81    {
 82        $glyphNumbers = array();
 83        foreach ($characterCodes as $key => $characterCode) {
 84
 85            if (($characterCode < $this->_startCode) || ($characterCode > $this->_endCode)) {
 86                $glyphNumbers[$key] = Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
 87                continue;
 88            }
 89
 90            $glyphIndex = $characterCode - $this->_startCode;
 91            $glyphNumbers[$key] = $this->_glyphIndexArray[$glyphIndex];
 92
 93        }
 94        return $glyphNumbers;
 95    }
 96
 97    /**
 98     * Returns the glyph number corresponding to the Unicode character.
 99     *
100     * If a particular character doesn't exist in this font, the special 'missing
101     * character glyph' will be substituted.
102     *
103     * See also {@link glyphNumbersForCharacters()} which is optimized for bulk
104     * operations.
105     *
106     * @param integer $characterCode Unicode character code (code point).
107     * @return integer Glyph number.
108     */
109    public function glyphNumberForCharacter($characterCode)
110    {
111        if (($characterCode < $this->_startCode) || ($characterCode > $this->_endCode)) {
112            return Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
113        }
114        $glyphIndex = $characterCode - $this->_startCode;
115        return $this->_glyphIndexArray[$glyphIndex];
116    }
117
118    /**
119     * Returns an array containing the Unicode characters that have entries in
120     * this character map.
121     *
122     * @return array Unicode character codes.
123     */
124    public function getCoveredCharacters()
125    {
126        $characterCodes = array();
127        for ($code = $this->_startCode; $code <= $this->_endCode; $code++) {
128            $characterCodes[] = $code;
129        }
130        return $characterCodes;
131    }
132
133
134    /**
135     * Returns an array containing the glyphs numbers that have entries in this character map.
136     * Keys are Unicode character codes (integers)
137     *
138     * This functionality is partially covered by glyphNumbersForCharacters(getCoveredCharacters())
139     * call, but this method do it in more effective way (prepare complete list instead of searching
140     * glyph for each character code).
141     *
142     * @internal
143     * @return array Array representing <Unicode character code> => <glyph number> pairs.
144     */
145    public function getCoveredCharactersGlyphs()
146    {
147        $glyphNumbers = array();
148        for ($code = $this->_startCode; $code <= $this->_endCode; $code++) {
149            $glyphNumbers[$code] = $this->_glyphIndexArray[$code - $this->_startCode];
150        }
151
152        return $glyphNumbers;
153    }
154
155
156  /* Object Lifecycle */
157
158    /**
159     * Object constructor
160     *
161     * Parses the raw binary table data. Throws an exception if the table is
162     * malformed.
163     *
164     * @param string $cmapData Raw binary cmap table data.
165     * @throws Zend_Pdf_Exception
166     */
167    public function __construct($cmapData)
168    {
169        /* Sanity check: The table should be at least 9 bytes in size.
170         */
171        $actualLength = strlen($cmapData);
172        if ($actualLength < 9) {
173            require_once 'Zend/Pdf/Exception.php';
174            throw new Zend_Pdf_Exception('Insufficient table data',
175                                         Zend_Pdf_Exception::CMAP_TABLE_DATA_TOO_SMALL);
176        }
177
178        /* Sanity check: Make sure this is right data for this table type.
179         */
180        $type = $this->_extractUInt2($cmapData, 0);
181        if ($type != Zend_Pdf_Cmap::TYPE_TRIMMED_TABLE) {
182            require_once 'Zend/Pdf/Exception.php';
183            throw new Zend_Pdf_Exception('Wrong cmap table type',
184                                         Zend_Pdf_Exception::CMAP_WRONG_TABLE_TYPE);
185        }
186
187        $length = $this->_extractUInt2($cmapData, 2);
188        if ($length != $actualLength) {
189            require_once 'Zend/Pdf/Exception.php';
190            throw new Zend_Pdf_Exception("Table length ($length) does not match actual length ($actualLength)",
191                                         Zend_Pdf_Exception::CMAP_WRONG_TABLE_LENGTH);
192        }
193
194        /* Mapping tables should be language-independent. The font may not work
195         * as expected if they are not. Unfortunately, many font files in the
196         * wild incorrectly record a language ID in this field, so we can't
197         * call this a failure.
198         */
199        $language = $this->_extractUInt2($cmapData, 4);
200        if ($language != 0) {
201            // Record a warning here somehow?
202        }
203
204        $this->_startCode = $this->_extractUInt2($cmapData, 6);
205
206        $entryCount = $this->_extractUInt2($cmapData, 8);
207        $expectedCount = ($length - 10) >> 1;
208        if ($entryCount != $expectedCount) {
209            require_once 'Zend/Pdf/Exception.php';
210            throw new Zend_Pdf_Exception("Entry count is wrong; expected: $expectedCount; actual: $entryCount",
211                                         Zend_Pdf_Exception::CMAP_WRONG_ENTRY_COUNT);
212        }
213
214        $this->_endCode = $this->_startCode + $entryCount - 1;
215
216        $offset = 10;
217        for ($i = 0; $i < $entryCount; $i++, $offset += 2) {
218            $this->_glyphIndexArray[] = $this->_extractUInt2($cmapData, $offset);
219        }
220
221        /* Sanity check: After reading all of the data, we should be at the end
222         * of the table.
223         */
224        if ($offset != $length) {
225            require_once 'Zend/Pdf/Exception.php';
226            throw new Zend_Pdf_Exception("Ending offset ($offset) does not match length ($length)",
227                                         Zend_Pdf_Exception::CMAP_FINAL_OFFSET_NOT_LENGTH);
228        }
229    }
230
231}