Cmap.php

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<?php
abstract class Zend_Pdf_Cmap
{
  /**** Class Constants ****/


  /* Cmap Table Types */

    const TYPE_BYTE_ENCODING = 0x00;

    const TYPE_HIGH_BYTE_MAPPING = 0x02;

    const TYPE_SEGMENT_TO_DELTA = 0x04;

    const TYPE_TRIMMED_TABLE = 0x06;

    const TYPE_MIXED_COVERAGE = 0x08;

    const TYPE_TRIMMED_ARRAY = 0x0a;

    const TYPE_SEGMENTED_COVERAGE = 0x0c;

    const TYPE_BYTE_ENCODING_STATIC = 0xf1;

    const TYPE_UNKNOWN = 0xff;


  /* Special Glyph Names */

    const MISSING_CHARACTER_GLYPH = 0x00;



  /**** Public Interface ****/


  /* Factory Methods */

    public static function cmapWithTypeData($cmapType, $cmapData)
    {
        switch ($cmapType) {
            case Zend_Pdf_Cmap::TYPE_BYTE_ENCODING:
                #require_once 'Zend/Pdf/Cmap/ByteEncoding.php';
                return new Zend_Pdf_Cmap_ByteEncoding($cmapData);

            case Zend_Pdf_Cmap::TYPE_BYTE_ENCODING_STATIC:
                #require_once 'Zend/Pdf/Cmap/ByteEncoding/Static.php';
                return new Zend_Pdf_Cmap_ByteEncoding_Static($cmapData);

            case Zend_Pdf_Cmap::TYPE_HIGH_BYTE_MAPPING:
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception('High byte mapping cmap currently unsupported',
                                             Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);

            case Zend_Pdf_Cmap::TYPE_SEGMENT_TO_DELTA:
                #require_once 'Zend/Pdf/Cmap/SegmentToDelta.php';
                return new Zend_Pdf_Cmap_SegmentToDelta($cmapData);

            case Zend_Pdf_Cmap::TYPE_TRIMMED_TABLE:
                #require_once 'Zend/Pdf/Cmap/TrimmedTable.php';
                return new Zend_Pdf_Cmap_TrimmedTable($cmapData);

            case Zend_Pdf_Cmap::TYPE_MIXED_COVERAGE:
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception('Mixed coverage cmap currently unsupported',
                                             Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);

            case Zend_Pdf_Cmap::TYPE_TRIMMED_ARRAY:
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception('Trimmed array cmap currently unsupported',
                                             Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);

            case Zend_Pdf_Cmap::TYPE_SEGMENTED_COVERAGE:
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception('Segmented coverage cmap currently unsupported',
                                             Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);

            default:
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception("Unknown cmap type: $cmapType",
                                             Zend_Pdf_Exception::CMAP_UNKNOWN_TYPE);
        }
    }


  /* Abstract Methods */

    abstract public function __construct($cmapData);

    abstract public function glyphNumbersForCharacters($characterCodes);

    abstract public function glyphNumberForCharacter($characterCode);

    abstract public function getCoveredCharacters();

    abstract public function getCoveredCharactersGlyphs();


  /**** Internal Methods ****/


  /* Internal Utility Methods */

    protected function _extractInt2(&$data, $index)
    {
        if (($index < 0) | (($index + 1) > strlen($data))) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception("Index out of range: $index",
                                         Zend_Pdf_Exception::INDEX_OUT_OF_RANGE);
        }
        $number = ord($data[$index]);
        if (($number & 0x80) == 0x80) {    // negative
            $number = ~((((~ $number) & 0xff) << 8) | ((~ ord($data[++$index])) & 0xff));
        } else {
            $number = ($number << 8) | ord($data[++$index]);
        }
        return $number;
    }

    protected function _extractUInt2(&$data, $index)
    {
        if (($index < 0) | (($index + 1) > strlen($data))) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception("Index out of range: $index",
                                         Zend_Pdf_Exception::INDEX_OUT_OF_RANGE);
        }
        $number = (ord($data[$index]) << 8) | ord($data[++$index]);
        return $number;
    }

    protected function _extractUInt4(&$data, $index)
    {
        if (($index < 0) | (($index + 3) > strlen($data))) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception("Index out of range: $index",
                                         Zend_Pdf_Exception::INDEX_OUT_OF_RANGE);
        }
        $number = (ord($data[$index]) << 24) | (ord($data[++$index]) << 16) |
                  (ord($data[++$index]) << 8) | ord($data[++$index]);
        return $number;
    }

}