344 lines
12 KiB
PHP
344 lines
12 KiB
PHP
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<?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: Cmap.php 16541 2009-07-07 06:59:03Z bkarwin $
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*/
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/** Zend_Pdf_Cmap_ByteEncoding */
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require_once 'Zend/Pdf/Cmap/ByteEncoding.php';
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/** Zend_Pdf_Cmap_ByteEncoding_Static */
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require_once 'Zend/Pdf/Cmap/ByteEncoding/Static.php';
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/** Zend_Pdf_Cmap_SegmentToDelta */
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require_once 'Zend/Pdf/Cmap/SegmentToDelta.php';
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/** Zend_Pdf_Cmap_TrimmedTable */
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require_once 'Zend/Pdf/Cmap/TrimmedTable.php';
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/**
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* Abstract helper class for {@link Zend_Pdf_Resource_Font} which manages font
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* character maps.
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*
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* Defines the public interface for concrete subclasses which are responsible
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* for mapping Unicode characters to the font's glyph numbers. Also provides
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* shared utility methods.
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*
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* Cmap objects should ordinarily be obtained through the factory method
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* {@link cmapWithTypeData()}.
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*
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* The supported character map types are those found in the OpenType spec. For
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* additional detail on the internal binary format of these tables, see:
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* <ul>
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* <li>{@link http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6cmap.html}
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* <li>{@link http://www.microsoft.com/OpenType/OTSpec/cmap.htm}
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* <li>{@link http://partners.adobe.com/public/developer/opentype/index_cmap.html}
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* </ul>
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*
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* @todo Write code for Zend_Pdf_FontCmap_HighByteMapping class.
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* @todo Write code for Zend_Pdf_FontCmap_MixedCoverage class.
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* @todo Write code for Zend_Pdf_FontCmap_TrimmedArray class.
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* @todo Write code for Zend_Pdf_FontCmap_SegmentedCoverage class.
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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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abstract class Zend_Pdf_Cmap
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{
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/**** Class Constants ****/
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/* Cmap Table Types */
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/**
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* Byte Encoding character map table type.
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*/
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const TYPE_BYTE_ENCODING = 0x00;
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/**
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* High Byte Mapping character map table type.
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*/
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const TYPE_HIGH_BYTE_MAPPING = 0x02;
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/**
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* Segment Value to Delta Mapping character map table type.
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*/
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const TYPE_SEGMENT_TO_DELTA = 0x04;
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/**
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* Trimmed Table character map table type.
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*/
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const TYPE_TRIMMED_TABLE = 0x06;
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/**
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* Mixed Coverage character map table type.
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*/
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const TYPE_MIXED_COVERAGE = 0x08;
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/**
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* Trimmed Array character map table type.
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*/
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const TYPE_TRIMMED_ARRAY = 0x0a;
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/**
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* Segmented Coverage character map table type.
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*/
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const TYPE_SEGMENTED_COVERAGE = 0x0c;
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/**
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* Static Byte Encoding character map table type. Variant of
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* {@link TYPE_BYTEENCODING}.
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*/
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const TYPE_BYTE_ENCODING_STATIC = 0xf1;
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/**
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* Unknown character map table type.
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*/
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const TYPE_UNKNOWN = 0xff;
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/* Special Glyph Names */
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/**
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* Glyph representing missing characters.
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*/
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const MISSING_CHARACTER_GLYPH = 0x00;
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/**** Public Interface ****/
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/* Factory Methods */
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/**
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* Instantiates the appropriate concrete subclass based on the type of cmap
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* table and returns the instance.
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*
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* The cmap type must be one of the following values:
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* <ul>
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* <li>{@link Zend_Pdf_Cmap::TYPE_BYTE_ENCODING}
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* <li>{@link Zend_Pdf_Cmap::TYPE_BYTE_ENCODING_STATIC}
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* <li>{@link Zend_Pdf_Cmap::TYPE_HIGH_BYTE_MAPPING}
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* <li>{@link Zend_Pdf_Cmap::TYPE_SEGMENT_TO_DELTA}
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* <li>{@link Zend_Pdf_Cmap::TYPE_TRIMMED_TABLE}
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* <li>{@link Zend_Pdf_Cmap::TYPE_MIXED_COVERAGE}
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* <li>{@link Zend_Pdf_Cmap::TYPE_TRIMMED_ARRAY}
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* <li>{@link Zend_Pdf_Cmap::TYPE_SEGMENTED_COVERAGE}
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* </ul>
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*
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* Throws an exception if the table type is invalid or the cmap table data
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* cannot be validated.
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*
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* @param integer $cmapType Type of cmap.
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* @param mixed $cmapData Cmap table data. Usually a string or array.
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* @return Zend_Pdf_Cmap
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* @throws Zend_Pdf_Exception
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*/
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public static function cmapWithTypeData($cmapType, $cmapData)
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{
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switch ($cmapType) {
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case Zend_Pdf_Cmap::TYPE_BYTE_ENCODING:
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return new Zend_Pdf_Cmap_ByteEncoding($cmapData);
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case Zend_Pdf_Cmap::TYPE_BYTE_ENCODING_STATIC:
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return new Zend_Pdf_Cmap_ByteEncoding_Static($cmapData);
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case Zend_Pdf_Cmap::TYPE_HIGH_BYTE_MAPPING:
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('High byte mapping cmap currently unsupported',
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Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);
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case Zend_Pdf_Cmap::TYPE_SEGMENT_TO_DELTA:
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return new Zend_Pdf_Cmap_SegmentToDelta($cmapData);
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case Zend_Pdf_Cmap::TYPE_TRIMMED_TABLE:
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return new Zend_Pdf_Cmap_TrimmedTable($cmapData);
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case Zend_Pdf_Cmap::TYPE_MIXED_COVERAGE:
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('Mixed coverage cmap currently unsupported',
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Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);
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case Zend_Pdf_Cmap::TYPE_TRIMMED_ARRAY:
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('Trimmed array cmap currently unsupported',
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Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);
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case Zend_Pdf_Cmap::TYPE_SEGMENTED_COVERAGE:
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('Segmented coverage cmap currently unsupported',
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Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);
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default:
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception("Unknown cmap type: $cmapType",
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Zend_Pdf_Exception::CMAP_UNKNOWN_TYPE);
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}
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}
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/* Abstract Methods */
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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 $cmapData Raw binary cmap table data.
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* @throws Zend_Pdf_Exception
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*/
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abstract public function __construct($cmapData);
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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 $characterCodes Array of Unicode character codes (code points).
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* @return array Array of glyph numbers.
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*/
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abstract public function glyphNumbersForCharacters($characterCodes);
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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 $characterCode Unicode character code (code point).
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* @return integer Glyph number.
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*/
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abstract public function glyphNumberForCharacter($characterCode);
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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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abstract public function getCoveredCharacters();
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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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abstract public function getCoveredCharactersGlyphs();
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/**** Internal Methods ****/
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/* Internal Utility Methods */
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/**
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* Extracts a signed 2-byte integer from a string.
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*
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* Integers are always big-endian. Throws an exception if the index is out
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* of range.
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*
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* @param string &$data
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* @param integer $index Position in string of integer.
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* @return integer
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* @throws Zend_Pdf_Exception
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*/
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protected function _extractInt2(&$data, $index)
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{
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if (($index < 0) | (($index + 1) > strlen($data))) {
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception("Index out of range: $index",
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Zend_Pdf_Exception::INDEX_OUT_OF_RANGE);
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}
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$number = ord($data[$index]);
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if (($number & 0x80) == 0x80) { // negative
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$number = ~((((~ $number) & 0xff) << 8) | ((~ ord($data[++$index])) & 0xff));
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} else {
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$number = ($number << 8) | ord($data[++$index]);
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}
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return $number;
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}
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/**
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* Extracts an unsigned 2-byte integer from a string.
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*
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* Integers are always big-endian. Throws an exception if the index is out
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* of range.
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*
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* @param string &$data
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* @param integer $index Position in string of integer.
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* @return integer
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* @throws Zend_Pdf_Exception
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*/
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protected function _extractUInt2(&$data, $index)
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{
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if (($index < 0) | (($index + 1) > strlen($data))) {
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception("Index out of range: $index",
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Zend_Pdf_Exception::INDEX_OUT_OF_RANGE);
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}
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$number = (ord($data[$index]) << 8) | ord($data[++$index]);
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return $number;
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}
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/**
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* Extracts an unsigned 4-byte integer from a string.
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*
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* Integers are always big-endian. Throws an exception if the index is out
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* of range.
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*
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* NOTE: If you ask for a 4-byte unsigned integer on a 32-bit machine, the
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* resulting value WILL BE SIGNED because PHP uses signed integers internally
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* for everything. To guarantee portability, be sure to use bitwise or
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* similar operators on large integers!
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*
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* @param string &$data
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* @param integer $index Position in string of integer.
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* @return integer
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* @throws Zend_Pdf_Exception
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*/
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protected function _extractUInt4(&$data, $index)
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{
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if (($index < 0) | (($index + 3) > strlen($data))) {
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception("Index out of range: $index",
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Zend_Pdf_Exception::INDEX_OUT_OF_RANGE);
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}
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$number = (ord($data[$index]) << 24) | (ord($data[++$index]) << 16) |
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(ord($data[++$index]) << 8) | ord($data[++$index]);
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return $number;
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}
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}
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