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/Zend/Pdf/Font.php

https://bitbucket.org/simukti/zf1
PHP | 732 lines | 207 code | 135 blank | 390 comment | 13 complexity | a70e76b291f320235eab2b86217cb691 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) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 19 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 20 * @version    $Id: Font.php 24593 2012-01-05 20:35:02Z matthew $
 21 */
 22
 23
 24/**
 25 * Abstract factory class which vends {@link Zend_Pdf_Resource_Font} objects.
 26 *
 27 * Font objects themselves are normally instantiated through the factory methods
 28 * {@link fontWithName()} or {@link fontWithPath()}.
 29 *
 30 * This class is also the home for font-related constants because the name of
 31 * the true base class ({@link Zend_Pdf_Resource_Font}) is not intuitive for the
 32 * end user.
 33 *
 34 * @package    Zend_Pdf
 35 * @subpackage Fonts
 36 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 37 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 38 */
 39abstract class Zend_Pdf_Font
 40{
 41  /**** Class Constants ****/
 42
 43
 44  /* Font Types */
 45
 46    /**
 47     * Unknown font type.
 48     */
 49    const TYPE_UNKNOWN = 0;
 50
 51    /**
 52     * One of the standard 14 PDF fonts.
 53     */
 54    const TYPE_STANDARD = 1;
 55
 56    /**
 57     * A PostScript Type 1 font.
 58     */
 59    const TYPE_TYPE_1 = 2;
 60
 61    /**
 62     * A TrueType font or an OpenType font containing TrueType outlines.
 63     */
 64    const TYPE_TRUETYPE = 3;
 65
 66    /**
 67     * Type 0 composite font.
 68     */
 69    const TYPE_TYPE_0 = 4;
 70
 71    /**
 72     * CID font containing a PostScript Type 1 font.
 73     * These fonts are used only to construct Type 0 composite fonts and can't be used directly
 74     */
 75    const TYPE_CIDFONT_TYPE_0 = 5;
 76
 77    /**
 78     * CID font containing a TrueType font or an OpenType font containing TrueType outlines.
 79     * These fonts are used only to construct Type 0 composite fonts and can't be used directly
 80     */
 81    const TYPE_CIDFONT_TYPE_2 = 6;
 82
 83
 84  /* Names of the Standard 14 PDF Fonts */
 85
 86    /**
 87     * Name of the standard PDF font Courier.
 88     */
 89    const FONT_COURIER = 'Courier';
 90
 91    /**
 92     * Name of the bold style of the standard PDF font Courier.
 93     */
 94    const FONT_COURIER_BOLD = 'Courier-Bold';
 95
 96    /**
 97     * Name of the italic style of the standard PDF font Courier.
 98     */
 99    const FONT_COURIER_OBLIQUE = 'Courier-Oblique';
100
101    /**
102     * Convenience constant for a common misspelling of
103     * {@link FONT_COURIER_OBLIQUE}.
104     */
105    const FONT_COURIER_ITALIC = 'Courier-Oblique';
106
107    /**
108     * Name of the bold and italic style of the standard PDF font Courier.
109     */
110    const FONT_COURIER_BOLD_OBLIQUE = 'Courier-BoldOblique';
111
112    /**
113     * Convenience constant for a common misspelling of
114     * {@link FONT_COURIER_BOLD_OBLIQUE}.
115     */
116    const FONT_COURIER_BOLD_ITALIC = 'Courier-BoldOblique';
117
118    /**
119     * Name of the standard PDF font Helvetica.
120     */
121    const FONT_HELVETICA = 'Helvetica';
122
123    /**
124     * Name of the bold style of the standard PDF font Helvetica.
125     */
126    const FONT_HELVETICA_BOLD = 'Helvetica-Bold';
127
128    /**
129     * Name of the italic style of the standard PDF font Helvetica.
130     */
131    const FONT_HELVETICA_OBLIQUE = 'Helvetica-Oblique';
132
133    /**
134     * Convenience constant for a common misspelling of
135     * {@link FONT_HELVETICA_OBLIQUE}.
136     */
137    const FONT_HELVETICA_ITALIC = 'Helvetica-Oblique';
138
139    /**
140     * Name of the bold and italic style of the standard PDF font Helvetica.
141     */
142    const FONT_HELVETICA_BOLD_OBLIQUE = 'Helvetica-BoldOblique';
143
144    /**
145     * Convenience constant for a common misspelling of
146     * {@link FONT_HELVETICA_BOLD_OBLIQUE}.
147     */
148    const FONT_HELVETICA_BOLD_ITALIC = 'Helvetica-BoldOblique';
149
150    /**
151     * Name of the standard PDF font Symbol.
152     */
153    const FONT_SYMBOL = 'Symbol';
154
155    /**
156     * Name of the standard PDF font Times.
157     */
158    const FONT_TIMES_ROMAN = 'Times-Roman';
159
160    /**
161     * Convenience constant for a common misspelling of
162     * {@link FONT_TIMES_ROMAN}.
163     */
164    const FONT_TIMES = 'Times-Roman';
165
166    /**
167     * Name of the bold style of the standard PDF font Times.
168     */
169    const FONT_TIMES_BOLD = 'Times-Bold';
170
171    /**
172     * Name of the italic style of the standard PDF font Times.
173     */
174    const FONT_TIMES_ITALIC = 'Times-Italic';
175
176    /**
177     * Name of the bold and italic style of the standard PDF font Times.
178     */
179    const FONT_TIMES_BOLD_ITALIC = 'Times-BoldItalic';
180
181    /**
182     * Name of the standard PDF font Zapf Dingbats.
183     */
184    const FONT_ZAPFDINGBATS = 'ZapfDingbats';
185
186
187  /* Font Name String Types */
188
189    /**
190     * Full copyright notice for the font.
191     */
192    const NAME_COPYRIGHT =  0;
193
194    /**
195     * Font family name. Used to group similar styles of fonts together.
196     */
197    const NAME_FAMILY =  1;
198
199    /**
200     * Font style within the font family. Examples: Regular, Italic, Bold, etc.
201     */
202    const NAME_STYLE =  2;
203
204    /**
205     * Unique font identifier.
206     */
207    const NAME_ID =  3;
208
209    /**
210     * Full font name. Usually a combination of the {@link NAME_FAMILY} and
211     * {@link NAME_STYLE} strings.
212     */
213    const NAME_FULL =  4;
214
215    /**
216     * Version number of the font.
217     */
218    const NAME_VERSION =  5;
219
220    /**
221     * PostScript name for the font. This is the name used to identify fonts
222     * internally and within the PDF file.
223     */
224    const NAME_POSTSCRIPT =  6;
225
226    /**
227     * Font trademark notice. This is distinct from the {@link NAME_COPYRIGHT}.
228     */
229    const NAME_TRADEMARK =  7;
230
231    /**
232     * Name of the font manufacturer.
233     */
234    const NAME_MANUFACTURER =  8;
235
236    /**
237     * Name of the designer of the font.
238     */
239    const NAME_DESIGNER =  9;
240
241    /**
242     * Description of the font. May contain revision information, usage
243     * recommendations, features, etc.
244     */
245    const NAME_DESCRIPTION = 10;
246
247    /**
248     * URL of the font vendor. Some fonts may contain a unique serial number
249     * embedded in this URL, which is used for licensing.
250     */
251    const NAME_VENDOR_URL = 11;
252
253    /**
254     * URL of the font designer ({@link NAME_DESIGNER}).
255     */
256    const NAME_DESIGNER_URL = 12;
257
258    /**
259     * Plain language licensing terms for the font.
260     */
261    const NAME_LICENSE = 13;
262
263    /**
264     * URL of more detailed licensing information for the font.
265     */
266    const NAME_LICENSE_URL = 14;
267
268    /**
269     * Preferred font family. Used by some fonts to work around a Microsoft
270     * Windows limitation where only four fonts styles can share the same
271     * {@link NAME_FAMILY} value.
272     */
273    const NAME_PREFERRED_FAMILY = 16;
274
275    /**
276     * Preferred font style. A more descriptive string than {@link NAME_STYLE}.
277     */
278    const NAME_PREFERRED_STYLE = 17;
279
280    /**
281     * Suggested text to use as a representative sample of the font.
282     */
283    const NAME_SAMPLE_TEXT = 19;
284
285    /**
286     * PostScript CID findfont name.
287     */
288    const NAME_CID_NAME = 20;
289
290
291  /* Font Weights */
292
293    /**
294     * Thin font weight.
295     */
296    const WEIGHT_THIN = 100;
297
298    /**
299     * Extra-light (Ultra-light) font weight.
300     */
301    const WEIGHT_EXTRA_LIGHT = 200;
302
303    /**
304     * Light font weight.
305     */
306    const WEIGHT_LIGHT = 300;
307
308    /**
309     * Normal (Regular) font weight.
310     */
311    const WEIGHT_NORMAL = 400;
312
313    /**
314     * Medium font weight.
315     */
316    const WEIGHT_MEDIUM = 500;
317
318    /**
319     * Semi-bold (Demi-bold) font weight.
320     */
321    const WEIGHT_SEMI_BOLD = 600;
322
323    /**
324     * Bold font weight.
325     */
326    const WEIGHT_BOLD = 700;
327
328    /**
329     * Extra-bold (Ultra-bold) font weight.
330     */
331    const WEIGHT_EXTRA_BOLD = 800;
332
333    /**
334     * Black (Heavy) font weight.
335     */
336    const WEIGHT_BLACK = 900;
337
338
339  /* Font Widths */
340
341    /**
342     * Ultra-condensed font width. Typically 50% of normal.
343     */
344    const WIDTH_ULTRA_CONDENSED = 1;
345
346    /**
347     * Extra-condensed font width. Typically 62.5% of normal.
348     */
349    const WIDTH_EXTRA_CONDENSED = 2;
350
351    /**
352     * Condensed font width. Typically 75% of normal.
353     */
354    const WIDTH_CONDENSED = 3;
355
356    /**
357     * Semi-condensed font width. Typically 87.5% of normal.
358     */
359    const WIDTH_SEMI_CONDENSED = 4;
360
361    /**
362     * Normal (Medium) font width.
363     */
364    const WIDTH_NORMAL = 5;
365
366    /**
367     * Semi-expanded font width. Typically 112.5% of normal.
368     */
369    const WIDTH_SEMI_EXPANDED = 6;
370
371    /**
372     * Expanded font width. Typically 125% of normal.
373     */
374    const WIDTH_EXPANDED = 7;
375
376    /**
377     * Extra-expanded font width. Typically 150% of normal.
378     */
379    const WIDTH_EXTRA_EXPANDED = 8;
380
381    /**
382     * Ultra-expanded font width. Typically 200% of normal.
383     */
384    const WIDTH_ULTRA_EXPANDED = 9;
385
386
387  /* Font Embedding Options */
388
389    /**
390     * Do not embed the font in the PDF document.
391     */
392    const EMBED_DONT_EMBED = 0x01;
393
394    /**
395     * Embed, but do not subset the font in the PDF document.
396     */
397    const EMBED_DONT_SUBSET = 0x02;
398
399    /**
400     * Embed, but do not compress the font in the PDF document.
401     */
402    const EMBED_DONT_COMPRESS = 0x04;
403
404    /**
405     * Suppress the exception normally thrown if the font cannot be embedded
406     * due to its copyright bits being set.
407     */
408    const EMBED_SUPPRESS_EMBED_EXCEPTION = 0x08;
409
410
411
412  /**** Class Variables ****/
413
414
415    /**
416     * Array whose keys are the unique PostScript names of instantiated fonts.
417     * The values are the font objects themselves.
418     * @var array
419     */
420    private static $_fontNames = array();
421
422    /**
423     * Array whose keys are the md5 hash of the full paths on disk for parsed
424     * fonts. The values are the font objects themselves.
425     * @var array
426     */
427    private static $_fontFilePaths = array();
428
429
430
431  /**** Public Interface ****/
432
433
434  /* Factory Methods */
435
436    /**
437     * Returns a {@link Zend_Pdf_Resource_Font} object by full name.
438     *
439     * This is the preferred method to obtain one of the standard 14 PDF fonts.
440     *
441     * The result of this method is cached, preventing unnecessary duplication
442     * of font objects. Repetitive calls for a font with the same name will
443     * return the same object.
444     *
445     * The $embeddingOptions parameter allows you to set certain flags related
446     * to font embedding. You may combine options by OR-ing them together. See
447     * the EMBED_ constants defined in {@link Zend_Pdf_Font} for the list of
448     * available options and their descriptions. Note that this value is only
449     * used when creating a font for the first time. If a font with the same
450     * name already exists, you will get that object and the options you specify
451     * here will be ignored. This is because fonts are only embedded within the
452     * PDF file once.
453     *
454     * If the font name supplied does not match the name of a previously
455     * instantiated object and it is not one of the 14 standard PDF fonts, an
456     * exception will be thrown.
457     *
458     * @param string $name Full PostScript name of font.
459     * @param integer $embeddingOptions (optional) Options for font embedding.
460     * @return Zend_Pdf_Resource_Font
461     * @throws Zend_Pdf_Exception
462     */
463    public static function fontWithName($name, $embeddingOptions = 0)
464        {
465        /* First check the cache. Don't duplicate font objects.
466         */
467        if (isset(Zend_Pdf_Font::$_fontNames[$name])) {
468            return Zend_Pdf_Font::$_fontNames[$name];
469        }
470
471        /**
472         * @todo It would be cool to be able to have a mapping of font names to
473         *   file paths in a configuration file for frequently used custom
474         *   fonts. This would allow a user to use custom fonts without having
475         *   to hard-code file paths all over the place. Table this idea until
476         *   {@link Zend_Config} is ready.
477         */
478
479        /* Not an existing font and no mapping in the config file. Check to see
480         * if this is one of the standard 14 PDF fonts.
481         */
482        switch ($name) {
483            case Zend_Pdf_Font::FONT_COURIER:
484                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/Courier.php';
485                $font = new Zend_Pdf_Resource_Font_Simple_Standard_Courier();
486                break;
487
488            case Zend_Pdf_Font::FONT_COURIER_BOLD:
489                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/CourierBold.php';
490                $font = new Zend_Pdf_Resource_Font_Simple_Standard_CourierBold();
491                break;
492
493            case Zend_Pdf_Font::FONT_COURIER_OBLIQUE:
494                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/CourierOblique.php';
495                $font = new Zend_Pdf_Resource_Font_Simple_Standard_CourierOblique();
496                break;
497
498            case Zend_Pdf_Font::FONT_COURIER_BOLD_OBLIQUE:
499                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/CourierBoldOblique.php';
500                $font = new Zend_Pdf_Resource_Font_Simple_Standard_CourierBoldOblique();
501                break;
502
503            case Zend_Pdf_Font::FONT_HELVETICA:
504                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/Helvetica.php';
505                $font = new Zend_Pdf_Resource_Font_Simple_Standard_Helvetica();
506                break;
507
508            case Zend_Pdf_Font::FONT_HELVETICA_BOLD:
509                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/HelveticaBold.php';
510                $font = new Zend_Pdf_Resource_Font_Simple_Standard_HelveticaBold();
511                break;
512
513            case Zend_Pdf_Font::FONT_HELVETICA_OBLIQUE:
514                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/HelveticaOblique.php';
515                $font = new Zend_Pdf_Resource_Font_Simple_Standard_HelveticaOblique();
516                break;
517
518            case Zend_Pdf_Font::FONT_HELVETICA_BOLD_OBLIQUE:
519                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/HelveticaBoldOblique.php';
520                $font = new Zend_Pdf_Resource_Font_Simple_Standard_HelveticaBoldOblique();
521                break;
522
523            case Zend_Pdf_Font::FONT_SYMBOL:
524                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/Symbol.php';
525                $font = new Zend_Pdf_Resource_Font_Simple_Standard_Symbol();
526                break;
527
528            case Zend_Pdf_Font::FONT_TIMES_ROMAN:
529                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/TimesRoman.php';
530                $font = new Zend_Pdf_Resource_Font_Simple_Standard_TimesRoman();
531                break;
532
533            case Zend_Pdf_Font::FONT_TIMES_BOLD:
534                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/TimesBold.php';
535                $font = new Zend_Pdf_Resource_Font_Simple_Standard_TimesBold();
536                break;
537
538            case Zend_Pdf_Font::FONT_TIMES_ITALIC:
539                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/TimesItalic.php';
540                $font = new Zend_Pdf_Resource_Font_Simple_Standard_TimesItalic();
541                break;
542
543            case Zend_Pdf_Font::FONT_TIMES_BOLD_ITALIC:
544                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/TimesBoldItalic.php';
545                $font = new Zend_Pdf_Resource_Font_Simple_Standard_TimesBoldItalic();
546                break;
547
548            case Zend_Pdf_Font::FONT_ZAPFDINGBATS:
549                require_once 'Zend/Pdf/Resource/Font/Simple/Standard/ZapfDingbats.php';
550                $font = new Zend_Pdf_Resource_Font_Simple_Standard_ZapfDingbats();
551                break;
552
553            default:
554                require_once 'Zend/Pdf/Exception.php';
555                throw new Zend_Pdf_Exception("Unknown font name: $name",
556                                             Zend_Pdf_Exception::BAD_FONT_NAME);
557        }
558
559        /* Add this new font to the cache array and return it for use.
560         */
561        Zend_Pdf_Font::$_fontNames[$name] = $font;
562        return $font;
563    }
564
565    /**
566     * Returns a {@link Zend_Pdf_Resource_Font} object by file path.
567     *
568     * The result of this method is cached, preventing unnecessary duplication
569     * of font objects. Repetitive calls for the font with the same path will
570     * return the same object.
571     *
572     * The $embeddingOptions parameter allows you to set certain flags related
573     * to font embedding. You may combine options by OR-ing them together. See
574     * the EMBED_ constants defined in {@link Zend_Pdf_Font} for the list of
575     * available options and their descriptions. Note that this value is only
576     * used when creating a font for the first time. If a font with the same
577     * name already exists, you will get that object and the options you specify
578     * here will be ignored. This is because fonts are only embedded within the
579     * PDF file once.
580     *
581     * If the file path supplied does not match the path of a previously
582     * instantiated object or the font type cannot be determined, an exception
583     * will be thrown.
584     *
585     * @param string $filePath Full path to the font file.
586     * @param integer $embeddingOptions (optional) Options for font embedding.
587     * @return Zend_Pdf_Resource_Font
588     * @throws Zend_Pdf_Exception
589     */
590    public static function fontWithPath($filePath, $embeddingOptions = 0)
591    {
592        /* First check the cache. Don't duplicate font objects.
593         */
594        $filePathKey = md5($filePath);
595        if (isset(Zend_Pdf_Font::$_fontFilePaths[$filePathKey])) {
596            return Zend_Pdf_Font::$_fontFilePaths[$filePathKey];
597        }
598
599        /* Create a file parser data source object for this file. File path and
600         * access permission checks are handled here.
601         */
602        require_once 'Zend/Pdf/FileParserDataSource/File.php';
603        $dataSource = new Zend_Pdf_FileParserDataSource_File($filePath);
604
605        /* Attempt to determine the type of font. We can't always trust file
606         * extensions, but try that first since it's fastest.
607         */
608        $fileExtension = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));
609
610        /* If it turns out that the file is named improperly and we guess the
611         * wrong type, we'll get null instead of a font object.
612         */
613        switch ($fileExtension) {
614            case 'ttf':
615                $font = Zend_Pdf_Font::_extractTrueTypeFont($dataSource, $embeddingOptions);
616                break;
617
618            default:
619                /* Unrecognized extension. Try to determine the type by actually
620                 * parsing it below.
621                 */
622                $font = null;
623                break;
624        }
625
626
627        if ($font === null) {
628            /* There was no match for the file extension or the extension was
629             * wrong. Attempt to detect the type of font by actually parsing it.
630             * We'll do the checks in order of most likely format to try to
631             * reduce the detection time.
632             */
633
634            // OpenType
635
636            // TrueType
637            if (($font === null) && ($fileExtension != 'ttf')) {
638                $font = Zend_Pdf_Font::_extractTrueTypeFont($dataSource, $embeddingOptions);
639            }
640
641            // Type 1 PostScript
642
643            // Mac OS X dfont
644
645            // others?
646        }
647
648
649        /* Done with the data source object.
650         */
651        $dataSource = null;
652
653        if ($font !== null) {
654            /* Parsing was successful. Add this font instance to the cache arrays
655             * and return it for use.
656             */
657            $fontName = $font->getFontName(Zend_Pdf_Font::NAME_POSTSCRIPT, '', '');
658            Zend_Pdf_Font::$_fontNames[$fontName] = $font;
659            $filePathKey = md5($filePath);
660            Zend_Pdf_Font::$_fontFilePaths[$filePathKey] = $font;
661            return $font;
662
663        } else {
664            /* The type of font could not be determined. Give up.
665             */
666            require_once 'Zend/Pdf/Exception.php';
667            throw new Zend_Pdf_Exception("Cannot determine font type: $filePath",
668                                         Zend_Pdf_Exception::CANT_DETERMINE_FONT_TYPE);
669         }
670
671    }
672
673
674
675  /**** Internal Methods ****/
676
677
678  /* Font Extraction Methods */
679
680    /**
681     * Attempts to extract a TrueType font from the data source.
682     *
683     * If the font parser throws an exception that suggests the data source
684     * simply doesn't contain a TrueType font, catches it and returns null. If
685     * an exception is thrown that suggests the TrueType font is corrupt or
686     * otherwise unusable, throws that exception. If successful, returns the
687     * font object.
688     *
689     * @param Zend_Pdf_FileParserDataSource $dataSource
690     * @param integer $embeddingOptions Options for font embedding.
691     * @return Zend_Pdf_Resource_Font_OpenType_TrueType May also return null if
692     *   the data source does not appear to contain a TrueType font.
693     * @throws Zend_Pdf_Exception
694     */
695    protected static function _extractTrueTypeFont($dataSource, $embeddingOptions)
696    {
697        try {
698            require_once 'Zend/Pdf/FileParser/Font/OpenType/TrueType.php';
699            $fontParser = new Zend_Pdf_FileParser_Font_OpenType_TrueType($dataSource);
700
701            $fontParser->parse();
702            if ($fontParser->isAdobeLatinSubset) {
703                require_once 'Zend/Pdf/Resource/Font/Simple/Parsed/TrueType.php';
704                $font = new Zend_Pdf_Resource_Font_Simple_Parsed_TrueType($fontParser, $embeddingOptions);
705            } else {
706                require_once 'Zend/Pdf/Resource/Font/CidFont/TrueType.php';
707                require_once 'Zend/Pdf/Resource/Font/Type0.php';
708                /* Use Composite Type 0 font which supports Unicode character mapping */
709                $cidFont = new Zend_Pdf_Resource_Font_CidFont_TrueType($fontParser, $embeddingOptions);
710                $font    = new Zend_Pdf_Resource_Font_Type0($cidFont);
711            }
712        } catch (Zend_Pdf_Exception $e) {
713            /* The following exception codes suggest that this isn't really a
714             * TrueType font. If we caught such an exception, simply return
715             * null. For all other cases, it probably is a TrueType font but has
716             * a problem; throw the exception again.
717             */
718            $fontParser = null;
719            require_once 'Zend/Pdf/Exception.php';
720            switch ($e->getCode()) {
721                case Zend_Pdf_Exception::WRONG_FONT_TYPE:    // break intentionally omitted
722                case Zend_Pdf_Exception::BAD_TABLE_COUNT:    // break intentionally omitted
723                case Zend_Pdf_Exception::BAD_MAGIC_NUMBER:
724                    return null;
725
726                default:
727                    throw new Zend_Pdf_Exception($e->getMessage(), $e->getCode(), $e);
728            }
729        }
730        return $font;
731    }
732}